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1 @c -*-texinfo-*-
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2 @c This is part of the XEmacs Lisp Reference Manual.
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3 @c Copyright (C) 1995, 1996 Ben Wing.
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4 @c See the file lispref.texi for copying conditions.
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5 @setfilename ../../info/glyphs.info
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6 @node Glyphs, Annotations, Faces and Window-System Objects, top
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7 @chapter Glyphs
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8 @cindex glyphs
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9
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408
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10 A @dfn{glyph} is an object that is used for pixmaps, widgets and
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11 images of all sorts, as well as for things that ``act'' like pixmaps,
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12 such as non-textual strings (@dfn{annotations}) displayed in a buffer or
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13 in the margins. It is used in begin-glyphs and end-glyphs attached to
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14 extents, marginal and textual annotations, overlay arrows
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15 (@code{overlay-arrow-*} variables), toolbar buttons, mouse pointers,
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16 frame icons, truncation and continuation markers, and the
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17 like. (Basically, any place there is an image or something that acts
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18 like an image, there will be a glyph object representing it.)
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19
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20 The actual image that is displayed (as opposed to its position or
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21 clipping) is defined by an @dfn{image specifier} object contained
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22 within the glyph. The separation between an image specifier object
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23 and a glyph object is made because the glyph includes other properties
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24 than just the actual image: e.g. the face it is displayed in (for text
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25 images), the alignment of the image (when it is in a buffer), etc.
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26
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27 @defun glyphp object
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28 This function returns @code{t} if @var{object} is a glyph.
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29 @end defun
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30
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31 @menu
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32 * Glyph Functions:: Functions for working with glyphs.
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33 * Images:: Graphical images displayed in a frame.
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34 * Glyph Types:: Each glyph has a particular type.
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35 * Mouse Pointer:: Controlling the mouse pointer.
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36 * Redisplay Glyphs:: Glyphs controlling various redisplay functions.
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37 * Subwindows:: Inserting an externally-controlled subwindow
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38 into a buffer.
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39 @end menu
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40
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41 @node Glyph Functions
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42 @section Glyph Functions
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43
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44 @menu
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45 * Creating Glyphs:: Creating new glyphs.
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46 * Glyph Properties:: Accessing and modifying a glyph's properties.
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47 * Glyph Convenience Functions::
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48 Convenience functions for accessing particular
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49 properties of a glyph.
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50 * Glyph Dimensions:: Determining the height, width, etc. of a glyph.
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51 @end menu
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52
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53 @node Creating Glyphs
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54 @subsection Creating Glyphs
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55
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56 @defun make-glyph &optional spec-list type
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57 This function creates a new glyph object of type @var{type}.
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58
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59 @var{spec-list} is used to initialize the glyph's image. It is
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60 typically an image instantiator (a string or a vector; @ref{Image
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61 Specifiers}), but can also be a list of such instantiators (each one in
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62 turn is tried until an image is successfully produced), a cons of a
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63 locale (frame, buffer, etc.) and an instantiator, a list of such conses,
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64 or any other form accepted by @code{canonicalize-spec-list}.
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65 @xref{Specifiers}, for more information about specifiers.
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66
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67 @var{type} specifies the type of the glyph, which specifies in which
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68 contexts the glyph can be used, and controls the allowable image types
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69 into which the glyph's image can be instantiated. @var{type} should be
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70 one of @code{buffer} (used for glyphs in an extent, the modeline, the
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71 toolbar, or elsewhere in a buffer), @code{pointer} (used for the
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72 mouse-pointer), or @code{icon} (used for a frame's icon), and defaults
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73 to @code{buffer}. @xref{Glyph Types}.
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408
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74
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75 A glyph in XEmacs does @strong{NOT} refer to a single unit of textual
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76 display (the XEmacs term for this is @dfn{rune}), but rather is an
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77 object encapsulating a graphical element, such as an image or widget (an
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78 element such as a button or text field; @dfn{widget} is the term for
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79 this under X Windows, and it's called a @dfn{control} under MS Windows).
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80 This graphical element could appear in a buffer, a margin, a gutter, or
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81 a toolbar, or as a mouse pointer or an icon, for example.
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82
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83 Creating a glyph using @code{make-glyph} does not specify @emph{where}
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84 the glyph will be used, but it does specify @emph{what} the glyph will
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85 look like. In particular, SPEC-LIST is used to specify this, and it's
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86 used to initialize the glyph's @code{image} property, which is an image
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87 specifier. (Note that @dfn{image} as used in the context of a glyph's
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88 @code{image} property or in the terms @dfn{image specifier}, @dfn{image
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89 instantiator}, or @dfn{image instance} does not refer to what people
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90 normally think of as an image (which in XEmacs is called a
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91 @dfn{pixmap}), but to any graphical element---a pixmap, a widget, or
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92 even a block of text, when used in the places that call for a glyph.)
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93 The format of the SPEC-LIST is typically an image instantiator (a string
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94 or a vector; @ref{Image Specifiers}), but can also be a list of such
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95 instantiators (each one in turn is tried until an image is successfully
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96 produced), a cons of a locale (frame, buffer, etc.) and an
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97 instantiator, a list of such conses, or any other form accepted by
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98 @code{canonicalize-spec-list}. @xref{Specifiers}, for more information
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99 about specifiers.
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100
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101 If you're not familiar with specifiers, you should be in order to
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102 understand how glyphs work. The clearest introduction to specifiers
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103 is in the Lispref manual, available under Info. (Choose
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104 Help->Info->Info Contents on the menubar or type C-h i.) You can
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105 also see @code{make-specifier} for a capsule summary. What's important to
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106 keep in mind is that a specifier lets you set a different value for
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107 any particular buffer, window, frame, device, or console. This allows
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108 for a great deal of flexibility; in particular, only one global glyph
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109 needs to exist for a particular purpose (e.g. the icon used to represent
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110 an iconified frame, the mouse pointer used over particular areas of a
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111 frame, etc.), and in these cases you do not create your own glyph, but
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112 rather modify the existing one.
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113
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114 As well as using @var{spec-list} to initialize the glyph, you can set
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115 specifications using @code{set-glyph-image}. Note that, due to a
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116 possibly questionable historical design decision, a glyph itself is not
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117 actually a specifier, but rather is an object containing an image
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118 specifier (as well as other, seldom-used properties). Therefore, you
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119 cannot set or access specifications for the glyph's image by directly
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120 using @code{set-specifier}, @code{specifier-instance} or the like on the
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121 glyph; instead use them on @code{(glyph-image @var{glyph})} or use the
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122 convenience functions @code{set-glyph-image},
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123 @code{glyph-image-instance}, and @code{glyph-image}.
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124
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125 Once you have created a glyph, you specify where it will be used as
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126 follows:
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127
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128 @itemize @bullet
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129 @item
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130 To insert a glyph into a buffer, create an extent in the buffer and then
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131 use @code{set-extent-begin-glyph} or @code{set-extent-end-glyph} to set
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132 a glyph to be displayed at the corresponding edge of the extent. (It is
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133 common to create zero-width extents for this purpose.)
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134
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135 @item
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136 To insert a glyph into the left or right margin of a buffer, first
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137 make sure the margin is visible by setting a value for the specifiers
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138 @code{left-margin-width} or @code{right-margin-width}. (Not strictly necessary
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139 when using margin glyphs with layout policy @code{whitespace}.) Then follow
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140 the same procedure above for inserting a glyph in a buffer, and then
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141 set a non-default layout policy for the glyph using
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142 @code{set-extent-begin-glyph-layout} or @code{set-extent-end-glyph-layout}.
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143 Alternatively, use the high-level annotations API (see
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144 @code{make-annotation}). (In point of fact, you can also use the annotations
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145 API for glyphs in a buffer, by setting a layout policy of @code{text}.)
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146
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147 @item
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148 To insert a glyph into the modeline, just put the glyph directly as one
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149 of the modeline elements. (Unfortunately you can't currently put a begin
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150 glyph or end glyph on one of the modeline extents---they're ignored.)
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151
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152 @item
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153 To insert a glyph into a toolbar, specify it as part of a toolbar
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154 instantiator (typically set on the specifier @code{default-toolbar}).
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155 See @code{default-toolbar} for more information. (Note that it is
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156 standard practice to use a symbol in place of the glyph list in the
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157 toolbar instantiator; the symbol is evalled to get the glyph list. This
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158 facilitates both creating the toolbar instantiator and modifying
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159 individual glyphs in a toolbar later on. For example, you can change
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160 the way that the Mail toolbar button looks by modifying the value of the
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161 variable @code{toolbar-mail-icon} (in general, @code{toolbar-*-icon})
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162 and then calling @code{(set-specifier-dirty-flag default-toolbar)}.
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163 (#### Unfortunately this doesn't quite work the way it should; the
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164 change will appear in new frames, but not existing ones.
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165
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166 @item
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167 To insert a glyph into a gutter, create or modify a gutter instantiator
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168 (typically set on the specifier @code{default-gutter}). Gutter
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169 instantiators consist of strings or lists of strings, so to insert a
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170 glyph, create an extent over the string, and use
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171 @code{set-extent-begin-glyph} or @code{set-extent-end-glyph} to set a
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172 glyph to be displayed at the corresponding edge of the extent, just like
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173 for glyphs in a buffer.
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174
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175 @item
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176 To use a glyph as the icon for a frame, you do not actually create a new
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177 glyph; rather, you change the specifications for the existing glyph
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178 @code{frame-icon-glyph}. (Remember that, because of the specifier nature
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179 of glyphs, you can set different values for any particular buffer or
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180 frame.)
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181
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182 @item
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183 To use a glyph as the mouse pointer, in general you do not create a new
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184 glyph, but rather you change the specifications of various existing
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185 glyphs, such as @code{text-pointer-glyph} for the pointer used over
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186 text, @code{modeline-pointer-glyph} for the pointer used over the
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187 modeline, etc. Do an apropos over @code{*-pointer-glyph} to find all of
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188 them. (Note also that you can temporarily set the mouse pointer to some
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189 specific shape by using @code{set-frame-pointer}, which takes an image
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190 instace, as obtained from calling @code{glyph-image-instance} on a glyph
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191 of type @code{pointer} -- either one of the above-mentioned variables or
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192 one you created yourself. (See below for what it means to create a
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193 glyph of type @code{pointer}.) This pointer will last only until the
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194 next mouse motion event is processed or certain other things happen,
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195 such as creating or deleting a window. (In fact, the above-mentioned
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196 pointer glyph variables are implemented as part of the default handler
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197 for mouse motion events. If you want to customize this behavior, take a
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198 look at @code{mode-motion-hook}, or @code{mouse-motion-handler} if you
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199 really want to get low-level.)
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200
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201 @item
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202 To use a glyph to control the shape of miscellaneous redisplay effects
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203 such as the truncation and continuation markers, set the appropriate
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204 existing glyph variables, as for icons and pointers above. See
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205 @code{continuation-glyph}, @code{control-arrow-glyph},
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206 @code{hscroll-glyph}, @code{invisible-text-glyph},
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207 @code{octal-escape-glyph}, and @code{truncation-glyph}. See also
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208 @code{overlay-arrow-string}, an odd redisplay leftover which can be set
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209 to a glyph you created, and will cause the glyph to be displayed on top
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210 of the text position specified in the marker stored in
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211 @code{overlay-arrow-position}.
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212
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213 @item
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214 To use a glyph in a display table (i.e. to control the appearance of any
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215 individual character), create the appropriate character glyphs and then
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216 set a specification for the specifier @code{current-display-table},
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217 which controls the appearance of characters. You can also set an
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218 overriding display table for use with text displayed in a particular
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219 face; see @code{set-face-display-table} and @code{make-display-table}.
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220 #### Note: Display tables do not currently support general Mule
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221 characters. They will be overhauled at some point to support this
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222 and to provide other features required under Mule.
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223
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224 @item
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225 To use a glyph as the background pixmap of a face: Note that the
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226 background pixmap of a face is actually an image specifier -- probably
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227 the only place in XEmacs where an image specifier occurs outside of a
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228 glyph. Similarly to how the glyph's image specifier works, you don't
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229 create your own image specifier, but rather add specifications to the
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230 existing one (using @code{set-face-background-pixmap}). Note that the
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231 image instance that is generated in order to actually display the
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232 background pixmap is of type @code{mono-pixmap}, meaning that it's a
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233 two-color image and the foreground and background of the image get
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234 filled in with the corresponding colors from the face.
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235 @end itemize
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236
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237 It is extremely rare that you will ever have to specify a value for
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238 TYPE, which should be one of @code{buffer} (used for glyphs in an
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239 extent, the modeline, the toolbar, or elsewhere in a buffer),
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240 @code{pointer} (used for the mouse-pointer), or @code{icon} (used for a
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241 frame's icon), and defaults to @code{buffer}. The only cases where it
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242 needs to be specified is when creating icon or pointer glyphs, and in
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243 both cases the necessary glyphs have already been created at startup and
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244 are accessed through the appropriate variables,
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245 e.g. @code{text-pointer-glyph} (or in general, @code{*-pointer-glyph})
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246 and @code{frame-icon-glyph}. @xref{Glyph Types}.
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247 @end defun
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248
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249 @defun make-glyph-internal &optional type
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250 This function creates a new, uninitialized glyph of type @var{type}.
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251 @end defun
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252
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253 @defun make-pointer-glyph &optional spec-list
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254
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255 Return a new @code{pointer-glyph} object with the specification list
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256 @var{spec-list}. This function is equivalent to calling
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257 @code{make-glyph} with a @var{type} of @code{pointer}.
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258
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259 It is extremely unlikely that you will ever need to create a pointer
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260 glyph. Instead, you probably want to be calling @code{set-glyph-image}
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261 on an existing glyph, e.g. @code{text-pointer-glyph}.
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262 @end defun
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263
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264 @defun make-icon-glyph &optional spec-list
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408
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265
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266 Return a new @code{pointer-glyph} object with the specification list
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267 @var{spec-list}. This function is equivalent to calling
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268 @code{make-glyph} with a @var{type} of @code{icon}.
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269
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270 It is extremely unlikely that you will ever need to create a pointer
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271 glyph. Instead, you probably want to be calling @code{set-glyph-image}
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272 on an existing glyph, e.g. @code{text-pointer-glyph}.
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273 @end defun
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274
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275 @node Glyph Properties
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276 @subsection Glyph Properties
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277
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278 Each glyph has a list of properties, which control all of the aspects of
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279 the glyph's appearance. The following symbols have predefined meanings:
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280
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281 @table @code
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282 @item image
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283 The image used to display the glyph.
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284
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285 @item baseline
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286 Percent above baseline that glyph is to be displayed. Only for glyphs
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287 displayed inside of a buffer.
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288
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289 @item contrib-p
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290 Whether the glyph contributes to the height of the line it's on.
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291 Only for glyphs displayed inside of a buffer.
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292
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293 @item face
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294 Face of this glyph (@emph{not} a specifier).
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295 @end table
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296
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297 @defun set-glyph-property glyph property value &optional locale tag-set how-to-add
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298 This function changes a property of a @var{glyph}.
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299
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300 For built-in properties, the actual value of the property is a specifier
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301 and you cannot change this; but you can change the specifications within
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302 the specifier, and that is what this function will do. For user-defined
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303 properties, you can use this function to either change the actual value
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304 of the property or, if this value is a specifier, change the
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305 specifications within it.
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306
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307 If @var{property} is a built-in property, the specifications to be added
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308 to this property can be supplied in many different ways:
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309
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310 @itemize @bullet
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311 @item
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312 If @var{value} is a simple instantiator (e.g. a string naming a pixmap
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313 filename) or a list of instantiators, then the instantiator(s) will be
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314 added as a specification of the property for the given @var{locale}
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315 (which defaults to @code{global} if omitted).
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316
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317 @item
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318 If @var{value} is a list of specifications (each of which is a cons of a
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319 locale and a list of instantiators), then @var{locale} must be
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320 @code{nil} (it does not make sense to explicitly specify a locale in
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321 this case), and specifications will be added as given.
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322
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323 @item
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324 If @var{value} is a specifier (as would be returned by
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325 @code{glyph-property} if no @var{locale} argument is given), then some
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326 or all of the specifications in the specifier will be added to the
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327 property. In this case, the function is really equivalent to
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328 @code{copy-specifier} and @var{locale} has the same semantics (if it is
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329 a particular locale, the specification for the locale will be copied; if
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330 a locale type, specifications for all locales of that type will be
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331 copied; if @code{nil} or @code{all}, then all specifications will be
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332 copied).
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333 @end itemize
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334
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335 @var{how-to-add} should be either @code{nil} or one of the symbols
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336 @code{prepend}, @code{append}, @code{remove-tag-set-prepend},
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337 @code{remove-tag-set-append}, @code{remove-locale},
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338 @code{remove-locale-type}, or @code{remove-all}. See
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339 @code{copy-specifier} and @code{add-spec-to-specifier} for a description
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340 of what each of these means. Most of the time, you do not need to worry
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341 about this argument; the default behavior usually is fine.
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342
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|
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343 In general, it is OK to pass an instance object (e.g. as returned by
|
|
|
344 @code{glyph-property-instance}) as an instantiator in place of an actual
|
|
|
345 instantiator. In such a case, the instantiator used to create that
|
|
|
346 instance object will be used (for example, if you set a font-instance
|
|
|
347 object as the value of the @code{font} property, then the font name used
|
|
|
348 to create that object will be used instead). If some cases, however,
|
|
|
349 doing this conversion does not make sense, and this will be noted in the
|
|
|
350 documentation for particular types of instance objects.
|
|
|
351
|
|
|
352 If @var{property} is not a built-in property, then this function will
|
|
|
353 simply set its value if @var{locale} is @code{nil}. However, if
|
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|
354 @var{locale} is given, then this function will attempt to add
|
|
|
355 @var{value} as the instantiator for the given @var{locale}, using
|
|
|
356 @code{add-spec-to-specifier}. If the value of the property is not a
|
|
|
357 specifier, it will automatically be converted into a @code{generic}
|
|
|
358 specifier.
|
|
|
359 @end defun
|
|
|
360
|
|
|
361 @defun glyph-property glyph property &optional locale
|
|
|
362 This function returns @var{glyph}'s value of the given @var{property}.
|
|
|
363
|
|
|
364 If @var{locale} is omitted, the @var{glyph}'s actual value for
|
|
|
365 @var{property} will be returned. For built-in properties, this will be
|
|
|
366 a specifier object of a type appropriate to the property (e.g. a font or
|
|
|
367 color specifier). For other properties, this could be anything.
|
|
|
368
|
|
|
369 If @var{locale} is supplied, then instead of returning the actual value,
|
|
|
370 the specification(s) for the given locale or locale type will be
|
|
|
371 returned. This will only work if the actual value of @var{property} is
|
|
|
372 a specifier (this will always be the case for built-in properties, but
|
|
2
|
373 may or may not apply to user-defined properties). If the actual value
|
|
0
|
374 of @var{property} is not a specifier, this value will simply be returned
|
|
|
375 regardless of @var{locale}.
|
|
|
376
|
|
|
377 The return value will be a list of instantiators (e.g. vectors
|
|
|
378 specifying pixmap data), or a list of specifications, each of which is a
|
|
|
379 cons of a locale and a list of instantiators. Specifically, if
|
|
|
380 @var{locale} is a particular locale (a buffer, window, frame, device, or
|
|
|
381 @code{global}), a list of instantiators for that locale will be
|
|
|
382 returned. Otherwise, if @var{locale} is a locale type (one of the
|
|
|
383 symbols @code{buffer}, @code{window}, @code{frame}, or @code{device}),
|
|
|
384 the specifications for all locales of that type will be returned.
|
|
|
385 Finally, if @var{locale} is @code{all}, the specifications for all
|
|
|
386 locales of all types will be returned.
|
|
|
387
|
|
|
388 The specifications in a specifier determine what the value of
|
|
|
389 @var{property} will be in a particular @dfn{domain} or set of
|
|
|
390 circumstances, which is typically a particular Emacs window along with
|
|
|
391 the buffer it contains and the frame and device it lies within. The
|
|
|
392 value is derived from the instantiator associated with the most specific
|
|
|
393 locale (in the order buffer, window, frame, device, and @code{global})
|
|
|
394 that matches the domain in question. In other words, given a domain
|
|
|
395 (i.e. an Emacs window, usually), the specifier for @var{property} will
|
|
|
396 first be searched for a specification whose locale is the buffer
|
|
|
397 contained within that window; then for a specification whose locale is
|
|
|
398 the window itself; then for a specification whose locale is the frame
|
|
|
399 that the window is contained within; etc. The first instantiator that
|
|
|
400 is valid for the domain (usually this means that the instantiator is
|
|
|
401 recognized by the device [i.e. the X server or TTY device] that the
|
|
|
402 domain is on). The function @code{glyph-property-instance} actually does
|
|
|
403 all this, and is used to determine how to display the glyph.
|
|
|
404 @end defun
|
|
|
405
|
|
|
406 @defun glyph-property-instance glyph property &optional domain default no-fallback
|
|
|
407 This function returns the instance of @var{glyph}'s @var{property} in the
|
|
|
408 specified @var{domain}.
|
|
|
409
|
|
|
410 Under most circumstances, @var{domain} will be a particular window, and
|
|
|
411 the returned instance describes how the specified property actually is
|
|
|
412 displayed for that window and the particular buffer in it. Note that
|
|
|
413 this may not be the same as how the property appears when the buffer is
|
|
|
414 displayed in a different window or frame, or how the property appears in
|
|
|
415 the same window if you switch to another buffer in that window; and in
|
|
|
416 those cases, the returned instance would be different.
|
|
|
417
|
|
|
418 The returned instance is an image-instance object, and you can query it
|
|
|
419 using the appropriate image instance functions. For example, you could use
|
|
|
420 @code{image-instance-depth} to find out the depth (number of color
|
|
|
421 planes) of a pixmap displayed in a particular window. The results might
|
|
|
422 be different from the results you would get for another window (perhaps
|
|
|
423 the user specified a different image for the frame that window is on; or
|
|
|
424 perhaps the same image was specified but the window is on a different X
|
|
|
425 server, and that X server has different color capabilities from this
|
|
|
426 one).
|
|
|
427
|
|
|
428 @var{domain} defaults to the selected window if omitted.
|
|
|
429
|
|
|
430 @var{domain} can be a frame or device, instead of a window. The value
|
|
2
|
431 returned for such a domain is used in special circumstances when a
|
|
0
|
432 more specific domain does not apply; for example, a frame value might be
|
|
|
433 used for coloring a toolbar, which is conceptually attached to a frame
|
|
|
434 rather than a particular window. The value is also useful in
|
|
|
435 determining what the value would be for a particular window within the
|
|
|
436 frame or device, if it is not overridden by a more specific
|
|
|
437 specification.
|
|
|
438
|
|
|
439 If @var{property} does not name a built-in property, its value will
|
|
|
440 simply be returned unless it is a specifier object, in which case it
|
|
|
441 will be instanced using @code{specifier-instance}.
|
|
|
442
|
|
|
443 Optional arguments @var{default} and @var{no-fallback} are the same as
|
|
|
444 in @code{specifier-instance}. @xref{Specifiers}.
|
|
|
445 @end defun
|
|
|
446
|
|
|
447 @defun remove-glyph-property glyph property &optional locale tag-set exact-p
|
|
|
448 This function removes a property from a glyph. For built-in properties,
|
|
|
449 this is analogous to @code{remove-specifier}. @xref{Specifiers,
|
|
|
450 remove-specifier-p}, for the meaning of the @var{locale}, @var{tag-set},
|
|
|
451 and @var{exact-p} arguments.
|
|
|
452 @end defun
|
|
|
453
|
|
|
454 @node Glyph Convenience Functions
|
|
|
455 @subsection Glyph Convenience Functions
|
|
|
456
|
|
|
457 The following functions are provided for working with specific
|
|
|
458 properties of a glyph. Note that these are exactly like calling
|
|
|
459 the general functions described above and passing in the
|
|
|
460 appropriate value for @var{property}.
|
|
|
461
|
|
|
462 Remember that if you want to determine the ``value'' of a
|
|
|
463 specific glyph property, you probably want to use the @code{*-instance}
|
|
|
464 functions. For example, to determine whether a glyph contributes
|
|
|
465 to its line height, use @code{glyph-contrib-p-instance}, not
|
|
|
466 @code{glyph-contrib-p}. (The latter will return a boolean specifier
|
|
|
467 or a list of specifications, and you probably aren't concerned with
|
|
|
468 these.)
|
|
|
469
|
|
|
470 @defun glyph-image glyph &optional locale
|
|
|
471 This function is equivalent to calling @code{glyph-property} with
|
|
|
472 a property of @code{image}. The return value will be an image
|
|
|
473 specifier if @var{locale} is @code{nil} or omitted; otherwise,
|
|
|
474 it will be a specification or list of specifications.
|
|
|
475 @end defun
|
|
|
476
|
|
|
477 @defun set-glyph-image glyph spec &optional locale tag-set how-to-add
|
|
|
478 This function is equivalent to calling @code{set-glyph-property} with
|
|
|
479 a property of @code{image}.
|
|
|
480 @end defun
|
|
|
481
|
|
|
482 @defun glyph-image-instance glyph &optional domain default no-fallback
|
|
|
483 This function returns the instance of @var{glyph}'s image in the given
|
|
|
484 @var{domain}, and is equivalent to calling
|
|
|
485 @code{glyph-property-instance} with a property of @code{image}. The
|
|
|
486 return value will be an image instance.
|
|
|
487
|
|
|
488 Normally @var{domain} will be a window or @code{nil} (meaning the
|
|
|
489 selected window), and an instance object describing how the image
|
|
|
490 appears in that particular window and buffer will be returned.
|
|
|
491 @end defun
|
|
|
492
|
|
|
493 @defun glyph-contrib-p glyph &optional locale
|
|
|
494 This function is equivalent to calling @code{glyph-property} with
|
|
|
495 a property of @code{contrib-p}. The return value will be a boolean
|
|
|
496 specifier if @var{locale} is @code{nil} or omitted; otherwise,
|
|
|
497 it will be a specification or list of specifications.
|
|
|
498 @end defun
|
|
|
499
|
|
|
500 @defun set-glyph-contrib-p glyph spec &optional locale tag-set how-to-add
|
|
|
501 This function is equivalent to calling @code{set-glyph-property} with
|
|
|
502 a property of @code{contrib-p}.
|
|
|
503 @end defun
|
|
|
504
|
|
|
505 @defun glyph-contrib-p-instance glyph &optional domain default no-fallback
|
|
|
506 This function returns whether the glyph contributes to its line height
|
|
|
507 in the given @var{domain}, and is equivalent to calling
|
|
|
508 @code{glyph-property-instance} with a property of @code{contrib-p}. The
|
|
|
509 return value will be either @code{nil} or @code{t}. (Normally @var{domain}
|
|
|
510 will be a window or @code{nil}, meaning the selected window.)
|
|
|
511 @end defun
|
|
|
512
|
|
|
513 @defun glyph-baseline glyph &optional locale
|
|
|
514 This function is equivalent to calling @code{glyph-property} with a
|
|
|
515 property of @code{baseline}. The return value will be a specifier if
|
|
|
516 @var{locale} is @code{nil} or omitted; otherwise, it will be a
|
|
|
517 specification or list of specifications.
|
|
|
518 @end defun
|
|
|
519
|
|
|
520 @defun set-glyph-baseline glyph spec &optional locale tag-set how-to-add
|
|
|
521 This function is equivalent to calling @code{set-glyph-property} with
|
|
|
522 a property of @code{baseline}.
|
|
|
523 @end defun
|
|
|
524
|
|
|
525 @defun glyph-baseline-instance glyph &optional domain default no-fallback
|
|
|
526 This function returns the instance of @var{glyph}'s baseline value in
|
|
|
527 the given @var{domain}, and is equivalent to calling
|
|
|
528 @code{glyph-property-instance} with a property of @code{baseline}. The
|
|
|
529 return value will be an integer or @code{nil}.
|
|
|
530
|
|
|
531 Normally @var{domain} will be a window or @code{nil} (meaning the
|
|
|
532 selected window), and an instance object describing the baseline value
|
|
|
533 appears in that particular window and buffer will be returned.
|
|
|
534 @end defun
|
|
|
535
|
|
|
536 @defun glyph-face glyph
|
|
|
537 This function returns the face of @var{glyph}. (Remember, this is
|
|
|
538 not a specifier, but a simple property.)
|
|
|
539 @end defun
|
|
|
540
|
|
|
541 @defun set-glyph-face glyph face
|
|
|
542 This function changes the face of @var{glyph} to @var{face}.
|
|
|
543 @end defun
|
|
|
544
|
|
|
545 @node Glyph Dimensions
|
|
|
546 @subsection Glyph Dimensions
|
|
|
547
|
|
|
548 @defun glyph-width glyph &optional window
|
|
|
549 This function returns the width of @var{glyph} on @var{window}. This
|
|
|
550 may not be exact as it does not take into account all of the context
|
|
|
551 that redisplay will.
|
|
|
552 @end defun
|
|
|
553
|
|
|
554 @defun glyph-ascent glyph &optional window
|
|
|
555 This function returns the ascent value of @var{glyph} on @var{window}.
|
|
|
556 This may not be exact as it does not take into account all of the
|
|
|
557 context that redisplay will.
|
|
|
558 @end defun
|
|
|
559
|
|
|
560 @defun glyph-descent glyph &optional window
|
|
|
561 This function returns the descent value of @var{glyph} on @var{window}.
|
|
|
562 This may not be exact as it does not take into account all of the
|
|
|
563 context that redisplay will.
|
|
|
564 @end defun
|
|
|
565
|
|
|
566 @defun glyph-height glyph &optional window
|
|
|
567 This function returns the height of @var{glyph} on @var{window}. (This
|
|
|
568 is equivalent to the sum of the ascent and descent values.) This may
|
|
|
569 not be exact as it does not take into account all of the context that
|
|
|
570 redisplay will.
|
|
|
571 @end defun
|
|
|
572
|
|
|
573 @node Images
|
|
|
574 @section Images
|
|
|
575
|
|
|
576 @menu
|
|
|
577 * Image Specifiers:: Specifying how an image will appear.
|
|
|
578 * Image Instantiator Conversion::
|
|
|
579 Conversion is applied to image instantiators
|
|
|
580 at the time they are added to an
|
|
|
581 image specifier or at the time they
|
|
|
582 are passed to @code{make-image-instance}.
|
|
|
583 * Image Instances:: What an image specifier gets instanced as.
|
|
|
584 @end menu
|
|
|
585
|
|
|
586 @node Image Specifiers
|
|
|
587 @subsection Image Specifiers
|
|
|
588 @cindex image specifiers
|
|
|
589
|
|
|
590 An image specifier is used to describe the actual image of a glyph.
|
|
|
591 It works like other specifiers (@pxref{Specifiers}), in that it contains
|
|
|
592 a number of specifications describing how the image should appear in a
|
|
|
593 variety of circumstances. These specifications are called @dfn{image
|
|
|
594 instantiators}. When XEmacs wants to display the image, it instantiates
|
|
|
595 the image into an @dfn{image instance}. Image instances are their own
|
|
|
596 primitive object type (similar to font instances and color instances),
|
|
|
597 describing how the image appears in a particular domain. (On the other
|
|
|
598 hand, image instantiators, which are just descriptions of how the image
|
|
|
599 should appear, are represented using strings or vectors.)
|
|
|
600
|
|
|
601 @defun image-specifier-p object
|
|
|
602 This function returns non-@code{nil} if @var{object} is an image specifier.
|
|
|
603 Usually, an image specifier results from calling @code{glyph-image} on
|
|
|
604 a glyph.
|
|
|
605 @end defun
|
|
|
606
|
|
|
607 @defun make-image-specifier spec-list
|
|
408
|
608 This function creates a new image specifier object and initializes it
|
|
|
609 according to @var{spec-list}. @xref{Specifiers}.
|
|
|
610
|
|
|
611 Note that, in practice, you rarely, if ever, need to actually create an
|
|
|
612 image specifier! (This function exists mainly for completeness.) Pretty
|
|
|
613 much the only use for image specifiers is to control how glyphs are
|
|
|
614 displayed, and the image specifier associated with a glyph (the
|
|
|
615 @code{image} property of a glyph) is created automatically when a glyph
|
|
|
616 is created and need not (and cannot, for that matter) ever be changed
|
|
|
617 (@pxref{Glyphs}). In fact, the design decision to create a separate
|
|
|
618 image specifier type, rather than make glyphs themselves be specifiers,
|
|
|
619 is debatable---the other properties of glyphs are rarely used and could
|
|
|
620 conceivably have been incorporated into the glyph's instantiator. The
|
|
|
621 rarely used glyph types (buffer, pointer, icon) could also have been
|
|
|
622 incorporated into the instantiator.
|
|
0
|
623 @end defun
|
|
|
624
|
|
|
625 Image instantiators come in many formats: @code{xbm}, @code{xpm},
|
|
|
626 @code{gif}, @code{jpeg}, etc. This describes the format of the data
|
|
|
627 describing the image. The resulting image instances also come in many
|
|
398
|
628 types---@code{mono-pixmap}, @code{color-pixmap}, @code{text},
|
|
0
|
629 @code{pointer}, etc. This refers to the behavior of the image and the
|
|
|
630 sorts of places it can appear. (For example, a color-pixmap image has
|
|
|
631 fixed colors specified for it, while a mono-pixmap image comes in two
|
|
|
632 unspecified shades ``foreground'' and ``background'' that are determined
|
|
|
633 from the face of the glyph or surrounding text; a text image appears as
|
|
|
634 a string of text and has an unspecified foreground, background, and
|
|
|
635 font; a pointer image behaves like a mono-pixmap image but can only be
|
|
|
636 used as a mouse pointer [mono-pixmap images cannot be used as mouse
|
|
|
637 pointers]; etc.) It is important to keep the distinction between image
|
|
|
638 instantiator format and image instance type in mind. Typically, a given
|
|
|
639 image instantiator format can result in many different image instance
|
|
|
640 types (for example, @code{xpm} can be instanced as @code{color-pixmap},
|
|
|
641 @code{mono-pixmap}, or @code{pointer}; whereas @code{cursor-font} can be
|
|
|
642 instanced only as @code{pointer}), and a particular image instance type
|
|
|
643 can be generated by many different image instantiator formats (e.g.
|
|
|
644 @code{color-pixmap} can be generated by @code{xpm}, @code{gif},
|
|
|
645 @code{jpeg}, etc.).
|
|
|
646
|
|
394
|
647 @xref{Image Instances}, for a more detailed discussion of image
|
|
0
|
648 instance types.
|
|
|
649
|
|
|
650 An image instantiator should be a string or a vector of the form
|
|
|
651
|
|
|
652 @example
|
|
|
653 @code{[@var{format} @var{:keyword} @var{value} ...]}
|
|
|
654 @end example
|
|
|
655
|
|
|
656 i.e. a format symbol followed by zero or more alternating keyword-value
|
|
|
657 pairs. The @dfn{format} field should be a symbol, one of
|
|
|
658
|
|
|
659 @table @code
|
|
|
660 @item nothing
|
|
404
|
661 Don't display anything; no keywords are valid for this. Can only be
|
|
|
662 instanced as @code{nothing}.
|
|
0
|
663 @item string
|
|
404
|
664 Display this image as a text string. Can only be instanced
|
|
0
|
665 as @code{text}, although support for instancing as @code{mono-pixmap}
|
|
404
|
666 should be added.
|
|
0
|
667 @item formatted-string
|
|
404
|
668 Display this image as a text string with replaceable fields,
|
|
|
669 similar to a modeline format string; not currently implemented.
|
|
0
|
670 @item xbm
|
|
404
|
671 An X bitmap; only if X support was compiled into this XEmacs. Can be
|
|
0
|
672 instanced as @code{mono-pixmap}, @code{color-pixmap}, or
|
|
404
|
673 @code{pointer}.
|
|
0
|
674 @item xpm
|
|
404
|
675 An XPM pixmap; only if XPM support was compiled into this XEmacs. Can
|
|
0
|
676 be instanced as @code{color-pixmap}, @code{mono-pixmap}, or
|
|
|
677 @code{pointer}. XPM is an add-on library for X that was designed to
|
|
|
678 rectify the shortcomings of the XBM format. Most implementations of X
|
|
|
679 include the XPM library as a standard part. If your vendor does not, it
|
|
|
680 is highly recommended that you download it and install it. You can get
|
|
404
|
681 it from the standard XEmacs FTP site, among other places.
|
|
0
|
682 @item xface
|
|
404
|
683 An X-Face bitmap, used to encode people's faces in e-mail messages;
|
|
0
|
684 only if X-Face support was compiled into this XEmacs. Can be instanced
|
|
404
|
685 as @code{mono-pixmap}, @code{color-pixmap}, or @code{pointer}.
|
|
0
|
686 @item gif
|
|
404
|
687 A GIF87 or GIF89 image; only if GIF support was compiled into this
|
|
0
|
688 XEmacs. Can be instanced as @code{color-pixmap}. Note that XEmacs
|
|
|
689 includes GIF decoding functions as a standard part of it, so if you have
|
|
|
690 X support, you will normally have GIF support, unless you explicitly
|
|
404
|
691 disable it at configure time.
|
|
0
|
692 @item jpeg
|
|
404
|
693 A JPEG-format image; only if JPEG support was compiled into this
|
|
0
|
694 XEmacs. Can be instanced as @code{color-pixmap}. If you have the JPEG
|
|
2
|
695 libraries present on your system when XEmacs is built, XEmacs will
|
|
|
696 automatically detect this and use them, unless you explicitly disable it
|
|
404
|
697 at configure time.
|
|
0
|
698 @item png
|
|
404
|
699 A PNG/GIF24 image; only if PNG support was compiled into this XEmacs.
|
|
|
700 Can be instanced as @code{color-pixmap}.
|
|
0
|
701 @item tiff
|
|
404
|
702 A TIFF-format image; only if TIFF support was compiled into this XEmacs.
|
|
0
|
703 @item cursor-font
|
|
404
|
704 One of the standard cursor-font names, such as @samp{watch} or
|
|
0
|
705 @samp{right_ptr} under X. Under X, this is, more specifically, any of
|
|
|
706 the standard cursor names from appendix B of the Xlib manual [also known
|
|
|
707 as the file @file{<X11/cursorfont.h>}] minus the @samp{XC_} prefix. On
|
|
|
708 other window systems, the valid names will be specific to the type of
|
|
404
|
709 window system. Can only be instanced as @code{pointer}.
|
|
0
|
710 @item font
|
|
404
|
711 A glyph from a font; i.e. the name of a font, and glyph index into it
|
|
0
|
712 of the form @samp{@var{font} fontname index [[mask-font] mask-index]}.
|
|
|
713 Only if X support was compiled into this XEmacs. Currently can only be
|
|
404
|
714 instanced as @code{pointer}, although this should probably be fixed.
|
|
408
|
715 @item mswindows-resource
|
|
|
716 An MS Windows pointer resource. Specifies a resource to retrieve
|
|
|
717 directly from the system (an OEM resource) or from a file, particularly
|
|
|
718 an executable file. If the resource is to be retrieved from a file, use
|
|
|
719 :file and optionally :resource-id. Otherwise use :resource-id. Always
|
|
|
720 specify :resource-type to specify the type (cursor, bitmap or icon) of
|
|
|
721 the resource. Possible values for :resource-id are listed below. Can
|
|
|
722 be instanced as @code{pointer} or @code{color-pixmap}.
|
|
0
|
723 @item subwindow
|
|
408
|
724 An embedded windowing system window. Can only be instanced as
|
|
|
725 @code{subwindow}.
|
|
|
726 @item button
|
|
|
727 A button widget; either a push button, radio button or toggle button.
|
|
|
728 Can only be instanced as @code{widget}.
|
|
|
729 @item combo-box
|
|
|
730 A drop list of selectable items in a widget, for editing text.
|
|
|
731 Can only be instanced as @code{widget}.
|
|
|
732 @item edit-field
|
|
|
733 A text editing widget. Can only be instanced as @code{widget}.
|
|
|
734 @item label
|
|
|
735 A static, text-only, widget; for displaying text. Can only be instanced
|
|
|
736 as @code{widget}.
|
|
|
737 @item layout
|
|
|
738 A widget for controlling the positioning of children underneath it.
|
|
|
739 Through the use of nested layouts, a widget hierarchy can be created
|
|
|
740 which can have the appearance of any standard dialog box or similar
|
|
|
741 arrangement; all of this is counted as one @dfn{glyph} and could appear
|
|
|
742 in many of the places that expect a single glyph. Can only be instanced
|
|
|
743 as @code{widget}.
|
|
|
744 @item native-layout
|
|
|
745 @c #### Document me better!
|
|
|
746 The native version of a layout widget.
|
|
|
747 Can only be instanced as @code{widget}.
|
|
|
748 @item progress-gauge
|
|
|
749 A sliding widget, for showing progress. Can only be instanced as
|
|
|
750 @code{widget}.
|
|
|
751 @item tab-control
|
|
|
752 A tab widget; a series of user selectable tabs. Can only be instanced
|
|
|
753 as @code{widget}.
|
|
|
754 @item tree-view
|
|
|
755 A folding widget. Can only be instanced as @code{widget}.
|
|
|
756 @item scrollbar
|
|
|
757 A scrollbar widget. Can only be instanced as @code{widget}.
|
|
0
|
758 @item autodetect
|
|
404
|
759 XEmacs tries to guess what format the data is in. If X support exists,
|
|
0
|
760 the data string will be checked to see if it names a filename. If so,
|
|
|
761 and this filename contains XBM or XPM data, the appropriate sort of
|
|
|
762 pixmap or pointer will be created. [This includes picking up any
|
|
|
763 specified hotspot or associated mask file.] Otherwise, if @code{pointer}
|
|
|
764 is one of the allowable image-instance types and the string names a
|
|
|
765 valid cursor-font name, the image will be created as a pointer.
|
|
|
766 Otherwise, the image will be displayed as text. If no X support exists,
|
|
404
|
767 the image will always be displayed as text.
|
|
408
|
768 @item inherit
|
|
|
769 Inherit from the background-pixmap property of a face. Can only be
|
|
|
770 instanced as @code{mono-pixmap}.
|
|
0
|
771 @end table
|
|
|
772
|
|
|
773 The valid keywords are:
|
|
|
774
|
|
|
775 @table @code
|
|
|
776 @item :data
|
|
404
|
777 Inline data. For most formats above, this should be a string. For
|
|
0
|
778 XBM images, this should be a list of three elements: width, height, and
|
|
|
779 a string of bit data. This keyword is not valid for instantiator
|
|
404
|
780 format @code{nothing}.
|
|
0
|
781
|
|
|
782 @item :file
|
|
404
|
783 Data is contained in a file. The value is the name of this file. If
|
|
0
|
784 both @code{:data} and @code{:file} are specified, the image is created
|
|
|
785 from what is specified in @code{:data} and the string in @code{:file}
|
|
|
786 becomes the value of the @code{image-instance-file-name} function when
|
|
|
787 applied to the resulting image-instance. This keyword is not valid for
|
|
|
788 instantiator formats @code{nothing}, @code{string},
|
|
|
789 @code{formatted-string}, @code{cursor-font}, @code{font}, and
|
|
404
|
790 @code{autodetect}.
|
|
0
|
791
|
|
|
792 @item :foreground
|
|
|
793 @itemx :background
|
|
404
|
794 For @code{xbm}, @code{xface}, @code{cursor-font}, and @code{font}.
|
|
0
|
795 These keywords allow you to explicitly specify foreground and background
|
|
|
796 colors. The argument should be anything acceptable to
|
|
|
797 @code{make-color-instance}. This will cause what would be a
|
|
|
798 @code{mono-pixmap} to instead be colorized as a two-color color-pixmap,
|
|
|
799 and specifies the foreground and/or background colors for a pointer
|
|
404
|
800 instead of black and white.
|
|
0
|
801
|
|
|
802 @item :mask-data
|
|
404
|
803 For @code{xbm} and @code{xface}. This specifies a mask to be used with the
|
|
0
|
804 bitmap. The format is a list of width, height, and bits, like for
|
|
404
|
805 @code{:data}.
|
|
0
|
806
|
|
|
807 @item :mask-file
|
|
404
|
808 For @code{xbm} and @code{xface}. This specifies a file containing the
|
|
0
|
809 mask data. If neither a mask file nor inline mask data is given for an
|
|
|
810 XBM image, and the XBM image comes from a file, XEmacs will look for a
|
|
|
811 mask file with the same name as the image file but with @samp{Mask} or
|
|
|
812 @samp{msk} appended. For example, if you specify the XBM file
|
|
|
813 @file{left_ptr} [usually located in @file{/usr/include/X11/bitmaps}],
|
|
|
814 the associated mask file @file{left_ptrmsk} will automatically be picked
|
|
404
|
815 up.
|
|
0
|
816
|
|
|
817 @item :hotspot-x
|
|
|
818 @itemx :hotspot-y
|
|
404
|
819 For @code{xbm} and @code{xface}. These keywords specify a hotspot if
|
|
0
|
820 the image is instantiated as a @code{pointer}. Note that if the XBM
|
|
|
821 image file specifies a hotspot, it will automatically be picked up if no
|
|
404
|
822 explicit hotspot is given.
|
|
0
|
823
|
|
|
824 @item :color-symbols
|
|
404
|
825 Only for @code{xpm}. This specifies an alist that maps strings that
|
|
0
|
826 specify symbolic color names to the actual color to be used for that
|
|
|
827 symbolic color (in the form of a string or a color-specifier object).
|
|
|
828 If this is not specified, the contents of @code{xpm-color-symbols} are
|
|
404
|
829 used to generate the alist.
|
|
408
|
830 @item :resource-id
|
|
|
831 Only for @code{mswindows-resource}. This must be either an integer
|
|
|
832 (which directly specifies a resource number) or a string. Valid strings
|
|
|
833 are
|
|
|
834
|
|
|
835 For bitmaps:
|
|
|
836
|
|
|
837 "close", "uparrow", "dnarrow", "rgarrow", "lfarrow",
|
|
|
838 "reduce", "zoom", "restore", "reduced", "zoomd",
|
|
|
839 "restored", "uparrowd", "dnarrowd", "rgarrowd", "lfarrowd",
|
|
|
840 "mnarrow", "combo", "uparrowi", "dnarrowi", "rgarrowi",
|
|
|
841 "lfarrowi", "size", "btsize", "check", "checkboxes", and
|
|
|
842 "btncorners".
|
|
|
843
|
|
|
844 For cursors:
|
|
|
845
|
|
|
846 "normal", "ibeam", "wait", "cross", "up", "sizenwse",
|
|
|
847 "sizenesw", "sizewe", "sizens", "sizeall", and "no".
|
|
|
848
|
|
|
849 For icons:
|
|
|
850
|
|
|
851 "sample", "hand", "ques", "bang", "note", and "winlogo".
|
|
|
852 @item :resource-type
|
|
|
853 Only for @code{mswindows-resource}. This must be a symbol, either
|
|
|
854 @code{cursor}, @code{icon}, or @code{bitmap}, specifying the type of
|
|
|
855 resource to be retrieved.
|
|
|
856 @item :face
|
|
|
857 Only for @code{inherit}. This specifies the face to inherit from. For
|
|
|
858 widgets this also specifies the face to use for display. It defaults to
|
|
|
859 gui-element-face.
|
|
0
|
860 @end table
|
|
|
861
|
|
408
|
862 Keywords accepted as menu item specs are also accepted by widgets.
|
|
|
863 These are @code{:selected}, @code{:active}, @code{:suffix},
|
|
|
864 @code{:keys}, @code{:style}, @code{:filter}, @code{:config},
|
|
|
865 @code{:included}, @code{:key-sequence}, @code{:accelerator},
|
|
|
866 @code{:label} and @code{:callback}.
|
|
|
867
|
|
0
|
868 If instead of a vector, the instantiator is a string, it will be
|
|
|
869 converted into a vector by looking it up according to the specs in the
|
|
|
870 @code{console-type-image-conversion-list} for the console type of
|
|
|
871 the domain (usually a window; sometimes a frame or device) over which
|
|
|
872 the image is being instantiated.
|
|
|
873
|
|
|
874 If the instantiator specifies data from a file, the data will be read in
|
|
2
|
875 at the time that the instantiator is added to the image specifier (which
|
|
|
876 may be well before the image is actually displayed), and the
|
|
|
877 instantiator will be converted into one of the inline-data forms, with
|
|
|
878 the filename retained using a @code{:file} keyword. This implies that
|
|
|
879 the file must exist when the instantiator is added to the image, but
|
|
|
880 does not need to exist at any other time (e.g. it may safely be a
|
|
|
881 temporary file).
|
|
0
|
882
|
|
|
883 @defun valid-image-instantiator-format-p format
|
|
|
884 This function returns non-@code{nil} if @var{format} is a valid image
|
|
|
885 instantiator format. Note that the return value for many formats listed
|
|
|
886 above depends on whether XEmacs was compiled with support for that format.
|
|
|
887 @end defun
|
|
|
888
|
|
|
889 @defun image-instantiator-format-list
|
|
|
890 This function return a list of valid image-instantiator formats.
|
|
|
891 @end defun
|
|
|
892
|
|
|
893 @defvar xpm-color-symbols
|
|
|
894 This variable holds definitions of logical color-names used when reading
|
|
|
895 XPM files. Elements of this list should be of the form
|
|
|
896 @code{(@var{color-name} @var{form-to-evaluate})}. The @var{color-name}
|
|
|
897 should be a string, which is the name of the color to define; the
|
|
|
898 @var{form-to-evaluate} should evaluate to a color specifier object, or a
|
|
|
899 string to be passed to @code{make-color-instance} (@pxref{Colors}). If
|
|
|
900 a loaded XPM file references a symbolic color called @var{color-name},
|
|
|
901 it will display as the computed color instead.
|
|
|
902
|
|
|
903 The default value of this variable defines the logical color names
|
|
|
904 @samp{"foreground"} and @samp{"background"} to be the colors of the
|
|
|
905 @code{default} face.
|
|
|
906 @end defvar
|
|
|
907
|
|
|
908 @defvar x-bitmap-file-path
|
|
|
909 A list of the directories in which X bitmap files may be found. If nil,
|
|
|
910 this is initialized from the @samp{"*bitmapFilePath"} resource. This is
|
|
|
911 used by the @code{make-image-instance} function (however, note that if
|
|
|
912 the environment variable @samp{XBMLANGPATH} is set, it is consulted
|
|
|
913 first).
|
|
|
914 @end defvar
|
|
|
915
|
|
|
916 @node Image Instantiator Conversion
|
|
|
917 @subsection Image Instantiator Conversion
|
|
|
918 @cindex image instantiator conversion
|
|
|
919 @cindex conversion of image instantiators
|
|
|
920
|
|
|
921 @defun set-console-type-image-conversion-list console-type list
|
|
|
922 This function sets the image-conversion-list for consoles of the given
|
|
|
923 @var{console-type}. The image-conversion-list specifies how image
|
|
|
924 instantiators that are strings should be interpreted. Each element of
|
|
|
925 the list should be a list of two elements (a regular expression string
|
|
|
926 and a vector) or a list of three elements (the preceding two plus an
|
|
|
927 integer index into the vector). The string is converted to the vector
|
|
|
928 associated with the first matching regular expression. If a vector
|
|
|
929 index is specified, the string itself is substituted into that position
|
|
|
930 in the vector.
|
|
|
931
|
|
|
932 Note: The conversion above is applied when the image instantiator is
|
|
|
933 added to an image specifier, not when the specifier is actually
|
|
|
934 instantiated. Therefore, changing the image-conversion-list only affects
|
|
|
935 newly-added instantiators. Existing instantiators in glyphs and image
|
|
|
936 specifiers will not be affected.
|
|
|
937 @end defun
|
|
|
938
|
|
|
939 @defun console-type-image-conversion-list console-type
|
|
|
940 This function returns the image-conversion-list for consoles of the given
|
|
|
941 @var{console-type}.
|
|
|
942 @end defun
|
|
|
943
|
|
|
944 @node Image Instances
|
|
|
945 @subsection Image Instances
|
|
|
946 @cindex image instances
|
|
|
947
|
|
|
948 Image-instance objects encapsulate the way a particular image (pixmap,
|
|
|
949 etc.) is displayed on a particular device.
|
|
|
950
|
|
|
951 In most circumstances, you do not need to directly create image
|
|
|
952 instances; use a glyph instead. However, it may occasionally be useful
|
|
|
953 to explicitly create image instances, if you want more control over the
|
|
|
954 instantiation process.
|
|
|
955
|
|
|
956 @defun image-instance-p object
|
|
|
957 This function returns non-@code{nil} if @var{object} is an image instance.
|
|
|
958 @end defun
|
|
|
959
|
|
|
960 @menu
|
|
|
961 * Image Instance Types:: Each image instances has a particular type.
|
|
|
962 * Image Instance Functions:: Functions for working with image instances.
|
|
|
963 @end menu
|
|
|
964
|
|
|
965 @node Image Instance Types
|
|
|
966 @subsubsection Image Instance Types
|
|
|
967 @cindex image instance types
|
|
|
968
|
|
|
969 Image instances come in a number of different types. The type
|
|
|
970 of an image instance specifies the nature of the image: Whether
|
|
|
971 it is a text string, a mono pixmap, a color pixmap, etc.
|
|
|
972
|
|
|
973 The valid image instance types are
|
|
|
974
|
|
|
975 @table @code
|
|
|
976 @item nothing
|
|
|
977 Nothing is displayed.
|
|
|
978
|
|
|
979 @item text
|
|
|
980 Displayed as text. The foreground and background colors and the
|
|
|
981 font of the text are specified independent of the pixmap. Typically
|
|
|
982 these attributes will come from the face of the surrounding text,
|
|
|
983 unless a face is specified for the glyph in which the image appears.
|
|
|
984
|
|
|
985 @item mono-pixmap
|
|
|
986 Displayed as a mono pixmap (a pixmap with only two colors where the
|
|
|
987 foreground and background can be specified independent of the pixmap;
|
|
|
988 typically the pixmap assumes the foreground and background colors of
|
|
|
989 the text around it, unless a face is specified for the glyph in which
|
|
|
990 the image appears).
|
|
|
991 @item color-pixmap
|
|
|
992
|
|
|
993 Displayed as a color pixmap.
|
|
|
994
|
|
|
995 @item pointer
|
|
|
996 Used as the mouse pointer for a window.
|
|
|
997
|
|
|
998 @item subwindow
|
|
|
999 A child window that is treated as an image. This allows (e.g.)
|
|
|
1000 another program to be responsible for drawing into the window.
|
|
|
1001 Not currently implemented.
|
|
|
1002 @end table
|
|
|
1003
|
|
|
1004 @defun valid-image-instance-type-p type
|
|
|
1005 This function returns non-@code{nil} if @var{type} is a valid image
|
|
|
1006 instance type.
|
|
|
1007 @end defun
|
|
|
1008
|
|
|
1009 @defun image-instance-type-list
|
|
|
1010 This function returns a list of the valid image instance types.
|
|
|
1011 @end defun
|
|
|
1012
|
|
|
1013 @defun image-instance-type image-instance
|
|
|
1014 This function returns the type of the given image instance. The return
|
|
|
1015 value will be one of @code{nothing}, @code{text}, @code{mono-pixmap},
|
|
|
1016 @code{color-pixmap}, @code{pointer}, or @code{subwindow}.
|
|
|
1017 @end defun
|
|
|
1018
|
|
|
1019 @defun text-image-instance-p object
|
|
|
1020 This function returns non-@code{nil} if @var{object} is an image
|
|
|
1021 instance of type @code{text}.
|
|
|
1022 @end defun
|
|
|
1023
|
|
|
1024 @defun mono-pixmap-image-instance-p object
|
|
|
1025 This function returns non-@code{nil} if @var{object} is an image
|
|
|
1026 instance of type @code{mono-pixmap}.
|
|
|
1027 @end defun
|
|
|
1028
|
|
|
1029 @defun color-pixmap-image-instance-p object
|
|
|
1030 This function returns non-@code{nil} if @var{object} is an image
|
|
|
1031 instance of type @code{color-pixmap}.
|
|
|
1032 @end defun
|
|
|
1033
|
|
|
1034 @defun pointer-image-instance-p object
|
|
|
1035 This function returns non-@code{nil} if @var{object} is an image
|
|
|
1036 instance of type @code{pointer}.
|
|
|
1037 @end defun
|
|
|
1038
|
|
|
1039 @defun subwindow-image-instance-p object
|
|
|
1040 This function returns non-@code{nil} if @var{object} is an image
|
|
|
1041 instance of type @code{subwindow}.
|
|
|
1042 @end defun
|
|
|
1043
|
|
|
1044 @defun nothing-image-instance-p object
|
|
|
1045 This function returns non-@code{nil} if @var{object} is an image
|
|
|
1046 instance of type @code{nothing}.
|
|
|
1047 @end defun
|
|
|
1048
|
|
408
|
1049 @defun widget-image-instance-p object
|
|
|
1050 Return t if @var{object} is an image instance of type @code{widget}.
|
|
|
1051 @end defun
|
|
|
1052
|
|
0
|
1053 @node Image Instance Functions
|
|
|
1054 @subsubsection Image Instance Functions
|
|
|
1055
|
|
408
|
1056 @defun make-image-instance data &optional domain dest-types no-error
|
|
0
|
1057 This function creates a new image-instance object.
|
|
|
1058
|
|
|
1059 @var{data} is an image instantiator, which describes the image
|
|
|
1060 (@pxref{Image Specifiers}).
|
|
|
1061
|
|
|
1062 @var{dest-types} should be a list of allowed image instance types that
|
|
|
1063 can be generated. The @var{dest-types} list is unordered. If multiple
|
|
|
1064 destination types are possible for a given instantiator, the ``most
|
|
|
1065 natural'' type for the instantiator's format is chosen. (For XBM, the
|
|
|
1066 most natural types are @code{mono-pixmap}, followed by
|
|
|
1067 @code{color-pixmap}, followed by @code{pointer}. For the other normal
|
|
|
1068 image formats, the most natural types are @code{color-pixmap}, followed
|
|
|
1069 by @code{mono-pixmap}, followed by @code{pointer}. For the string and
|
|
|
1070 formatted-string formats, the most natural types are @code{text},
|
|
|
1071 followed by @code{mono-pixmap} (not currently implemented), followed by
|
|
408
|
1072 @code{color-pixmap} (not currently implemented). For MS Windows
|
|
|
1073 resources, the most natural type for pointer resources is
|
|
|
1074 @code{pointer}, and for the others it's @code{color-pixmap}. The other
|
|
|
1075 formats can only be instantiated as one type. (If you want to control
|
|
|
1076 more specifically the order of the types into which an image is
|
|
|
1077 instantiated, just call @code{make-image-instance} repeatedly until it
|
|
|
1078 succeeds, passing less and less preferred destination types each time.
|
|
0
|
1079
|
|
|
1080 If @var{dest-types} is omitted, all possible types are allowed.
|
|
|
1081
|
|
408
|
1082 @var{domain} specifies the domain to which the image instance will be
|
|
|
1083 attached. This domain is termed the @dfn{governing domain}. The type
|
|
|
1084 of the governing domain depends on the image instantiator
|
|
|
1085 format. (Although, more correctly, it should probably depend on the
|
|
|
1086 image instance type.) For example, pixmap image instances are specific
|
|
|
1087 to a device, but widget image instances are specific to a particular
|
|
|
1088 XEmacs window because in order to display such a widget when two windows
|
|
|
1089 onto the same buffer want to display the widget, two separate underlying
|
|
|
1090 widgets must be created. (That's because a widget is actually a child
|
|
|
1091 window-system window, and all window-system windows have a unique
|
|
|
1092 existence on the screen.) This means that the governing domain for a
|
|
|
1093 pixmap image instance will be some device (most likely, the only
|
|
|
1094 existing device), whereas the governing domain for a widget image
|
|
|
1095 instance will be some XEmacs window.
|
|
|
1096
|
|
|
1097 If you specify an overly general @var{domain} (e.g. a frame when a
|
|
|
1098 window was wanted), an error is signaled. If you specify an overly
|
|
|
1099 specific @var{domain} (e.g. a window when a device was wanted), the
|
|
|
1100 corresponding general domain is fetched and used instead. For
|
|
|
1101 @code{make-image-instance}, it makes no difference whether you specify
|
|
|
1102 an overly specific domain or the properly general domain derived from
|
|
|
1103 it. However, it does matter when creating an image instance by
|
|
|
1104 instantiating a specifier or glyph (e.g. with
|
|
|
1105 @code{glyph-image-instance}), because the more specific domain causes
|
|
|
1106 spec lookup to start there and proceed to more general domains. (It
|
|
|
1107 would also matter when creating an image instance with an instantiator
|
|
|
1108 format of @code{inherit}, but we currently disallow this. #### We should
|
|
|
1109 fix this.)
|
|
|
1110 n
|
|
|
1111 If omitted, @var{domain} defaults to the selected window.
|
|
|
1112
|
|
0
|
1113 @var{no-error} controls what happens when the image cannot be generated.
|
|
|
1114 If @var{nil}, an error message is generated. If @var{t}, no messages
|
|
|
1115 are generated and this function returns @var{nil}. If anything else, a
|
|
|
1116 warning message is generated and this function returns @var{nil}.
|
|
|
1117 @end defun
|
|
|
1118
|
|
|
1119 @defun colorize-image-instance image-instance foreground background
|
|
|
1120 This function makes the image instance be displayed in the given
|
|
|
1121 colors. Image instances come in two varieties: bitmaps, which are 1
|
|
|
1122 bit deep which are rendered in the prevailing foreground and background
|
|
|
1123 colors; and pixmaps, which are of arbitrary depth (including 1) and
|
|
|
1124 which have the colors explicitly specified. This function converts a
|
|
|
1125 bitmap to a pixmap. If the image instance was a pixmap already,
|
|
|
1126 nothing is done (and @code{nil} is returned). Otherwise @code{t} is
|
|
|
1127 returned.
|
|
|
1128 @end defun
|
|
|
1129
|
|
|
1130 @defun image-instance-name image-instance
|
|
|
1131 This function returns the name of the given image instance.
|
|
|
1132 @end defun
|
|
|
1133
|
|
408
|
1134 @defun image-instance-domain image-instance
|
|
|
1135
|
|
|
1136 Return the governing domain of the given @var{image-instance}. The
|
|
|
1137 governing domain of an image instance is the domain that the image
|
|
|
1138 instance is specific to. It is @emph{NOT} necessarily the domain that
|
|
|
1139 was given to the call to @code{specifier-instance} that resulted in the
|
|
|
1140 creation of this image instance. See @code{make-image-instance} for
|
|
|
1141 more information on governing domains.
|
|
|
1142 @end defun
|
|
|
1143
|
|
|
1144
|
|
0
|
1145 @defun image-instance-string image-instance
|
|
|
1146 This function returns the string of the given image instance. This will
|
|
|
1147 only be non-@code{nil} for text image instances.
|
|
|
1148 @end defun
|
|
|
1149
|
|
|
1150 @defun image-instance-file-name image-instance
|
|
|
1151 This function returns the file name from which @var{image-instance} was
|
|
|
1152 read, if known.
|
|
|
1153 @end defun
|
|
|
1154
|
|
|
1155 @defun image-instance-mask-file-name image-instance
|
|
|
1156 This function returns the file name from which @var{image-instance}'s
|
|
|
1157 mask was read, if known.
|
|
|
1158 @end defun
|
|
|
1159
|
|
|
1160 @defun image-instance-depth image-instance
|
|
|
1161 This function returns the depth of the image instance. This is 0 for a
|
|
|
1162 mono pixmap, or a positive integer for a color pixmap.
|
|
|
1163 @end defun
|
|
|
1164
|
|
|
1165 @defun image-instance-height image-instance
|
|
|
1166 This function returns the height of the image instance, in pixels.
|
|
|
1167 @end defun
|
|
|
1168
|
|
|
1169 @defun image-instance-width image-instance
|
|
|
1170 This function returns the width of the image instance, in pixels.
|
|
|
1171 @end defun
|
|
|
1172
|
|
|
1173 @defun image-instance-hotspot-x image-instance
|
|
|
1174 This function returns the X coordinate of the image instance's hotspot,
|
|
|
1175 if known. This is a point relative to the origin of the pixmap. When
|
|
|
1176 an image is used as a mouse pointer, the hotspot is the point on the
|
|
|
1177 image that sits over the location that the pointer points to. This is,
|
|
|
1178 for example, the tip of the arrow or the center of the crosshairs.
|
|
|
1179
|
|
|
1180 This will always be @code{nil} for a non-pointer image instance.
|
|
|
1181 @end defun
|
|
|
1182
|
|
|
1183 @defun image-instance-hotspot-y image-instance
|
|
|
1184 This function returns the Y coordinate of the image instance's hotspot,
|
|
|
1185 if known.
|
|
|
1186 @end defun
|
|
|
1187
|
|
|
1188 @defun image-instance-foreground image-instance
|
|
|
1189 This function returns the foreground color of @var{image-instance}, if
|
|
|
1190 applicable. This will be a color instance or @code{nil}. (It will only
|
|
|
1191 be non-@code{nil} for colorized mono pixmaps and for pointers.)
|
|
|
1192 @end defun
|
|
|
1193
|
|
|
1194 @defun image-instance-background image-instance
|
|
|
1195 This function returns the background color of @var{image-instance}, if
|
|
|
1196 applicable. This will be a color instance or @code{nil}. (It will only
|
|
|
1197 be non-@code{nil} for colorized mono pixmaps and for pointers.)
|
|
|
1198 @end defun
|
|
|
1199
|
|
|
1200
|
|
|
1201 @node Glyph Types
|
|
|
1202 @section Glyph Types
|
|
|
1203
|
|
|
1204 Each glyph has a particular type, which controls how the glyph's image
|
|
|
1205 is generated. Each glyph type has a corresponding list of allowable
|
|
|
1206 image instance types that can be generated. When you call
|
|
|
1207 @code{glyph-image-instance} to retrieve the image instance of a glyph,
|
|
|
1208 XEmacs does the equivalent of calling @code{make-image-instance} and
|
|
|
1209 passing in @var{dest-types} the list of allowable image instance types
|
|
|
1210 for the glyph's type.
|
|
|
1211
|
|
|
1212 @itemize @bullet
|
|
|
1213 @item
|
|
|
1214 @code{buffer} glyphs can be used as the begin-glyph or end-glyph of an
|
|
|
1215 extent, in the modeline, and in the toolbar. Their image can be
|
|
|
1216 instantiated as @code{nothing}, @code{mono-pixmap}, @code{color-pixmap},
|
|
|
1217 @code{text}, and @code{subwindow}.
|
|
|
1218
|
|
|
1219 @item
|
|
|
1220 @code{pointer} glyphs can be used to specify the mouse pointer. Their
|
|
|
1221 image can be instantiated as @code{pointer}.
|
|
|
1222
|
|
|
1223 @item
|
|
|
1224 @code{icon} glyphs can be used to specify the icon used when a frame is
|
|
|
1225 iconified. Their image can be instantiated as @code{mono-pixmap} and
|
|
|
1226 @code{color-pixmap}.
|
|
|
1227 @end itemize
|
|
|
1228
|
|
|
1229 @defun glyph-type glyph
|
|
|
1230 This function returns the type of the given glyph. The return value
|
|
|
1231 will be a symbol, one of @code{buffer}, @code{pointer}, or @code{icon}.
|
|
|
1232 @end defun
|
|
|
1233
|
|
|
1234 @defun valid-glyph-type-p glyph-type
|
|
|
1235 Given a @var{glyph-type}, this function returns non-@code{nil} if it is
|
|
|
1236 valid.
|
|
|
1237 @end defun
|
|
|
1238
|
|
|
1239 @defun glyph-type-list
|
|
|
1240 This function returns a list of valid glyph types.
|
|
|
1241 @end defun
|
|
|
1242
|
|
|
1243 @defun buffer-glyph-p object
|
|
|
1244 This function returns non-@code{nil} if @var{object} is a glyph of type
|
|
|
1245 @code{buffer}.
|
|
|
1246 @end defun
|
|
|
1247
|
|
|
1248 @defun icon-glyph-p object
|
|
|
1249 This function returns non-@code{nil} if @var{object} is a glyph of type
|
|
|
1250 @code{icon}.
|
|
|
1251 @end defun
|
|
|
1252
|
|
|
1253 @defun pointer-glyph-p object
|
|
|
1254 This function returns non-@code{nil} if @var{object} is a glyph of type
|
|
|
1255 @code{pointer}.
|
|
|
1256 @end defun
|
|
|
1257
|
|
|
1258 @node Mouse Pointer
|
|
|
1259 @section Mouse Pointer
|
|
|
1260 @cindex mouse cursor
|
|
|
1261 @cindex cursor (mouse)
|
|
|
1262 @cindex pointer (mouse)
|
|
|
1263 @cindex mouse pointer
|
|
|
1264
|
|
|
1265 The shape of the mouse pointer when over a particular section of a frame
|
|
|
1266 is controlled using various glyph variables. Since the image of a glyph
|
|
|
1267 is a specifier, it can be controlled on a per-buffer, per-frame, per-window,
|
|
|
1268 or per-device basis.
|
|
|
1269
|
|
|
1270 You should use @code{set-glyph-image} to set the following variables,
|
|
|
1271 @emph{not} @code{setq}.
|
|
|
1272
|
|
|
1273 @defvr Glyph text-pointer-glyph
|
|
|
1274 This variable specifies the shape of the mouse pointer when over text.
|
|
|
1275 @end defvr
|
|
|
1276
|
|
|
1277 @defvr Glyph nontext-pointer-glyph
|
|
|
1278 This variable specifies the shape of the mouse pointer when over a
|
|
|
1279 buffer, but not over text. If unspecified in a particular domain,
|
|
|
1280 @code{text-pointer-glyph} is used.
|
|
|
1281 @end defvr
|
|
|
1282
|
|
|
1283 @defvr Glyph modeline-pointer-glyph
|
|
|
1284 This variable specifies the shape of the mouse pointer when over the modeline.
|
|
|
1285 If unspecified in a particular domain, @code{nontext-pointer-glyph} is used.
|
|
|
1286 @end defvr
|
|
|
1287
|
|
|
1288 @defvr Glyph selection-pointer-glyph
|
|
|
1289 This variable specifies the shape of the mouse pointer when over a
|
|
|
1290 selectable text region. If unspecified in a particular domain,
|
|
|
1291 @code{text-pointer-glyph} is used.
|
|
|
1292 @end defvr
|
|
|
1293
|
|
|
1294 @defvr Glyph gc-pointer-glyph
|
|
|
1295 This variable specifies the shape of the mouse pointer when a garbage
|
|
|
1296 collection is in progress. If the selected window is on a window system
|
|
|
1297 and this glyph specifies a value (i.e. a pointer image instance) in the
|
|
|
1298 domain of the selected window, the pointer will be changed as specified
|
|
|
1299 during garbage collection. Otherwise, a message will be printed in the
|
|
|
1300 echo area, as controlled by @code{gc-message}.
|
|
|
1301 @end defvr
|
|
|
1302
|
|
|
1303 @defvr Glyph busy-pointer-glyph
|
|
|
1304 This variable specifies the shape of the mouse pointer when XEmacs is busy.
|
|
|
1305 If unspecified in a particular domain, the pointer is not changed
|
|
|
1306 when XEmacs is busy.
|
|
|
1307 @end defvr
|
|
|
1308
|
|
|
1309 @defvr Glyph menubar-pointer-glyph
|
|
|
1310 This variable specifies the shape of the mouse pointer when over the
|
|
|
1311 menubar. If unspecified in a particular domain, the
|
|
|
1312 window-system-provided default pointer is used.
|
|
|
1313 @end defvr
|
|
|
1314
|
|
|
1315 @defvr Glyph scrollbar-pointer-glyph
|
|
|
1316 This variable specifies the shape of the mouse pointer when over a
|
|
|
1317 scrollbar. If unspecified in a particular domain, the
|
|
|
1318 window-system-provided default pointer is used.
|
|
|
1319 @end defvr
|
|
|
1320
|
|
|
1321 @defvr Glyph toolbar-pointer-glyph
|
|
|
1322 This variable specifies the shape of the mouse pointer when over a
|
|
|
1323 toolbar. If unspecified in a particular domain,
|
|
|
1324 @code{nontext-pointer-glyph} is used.
|
|
|
1325 @end defvr
|
|
|
1326
|
|
|
1327 Internally, these variables are implemented in
|
|
|
1328 @code{default-mouse-motion-handler}, and thus only take effect when the
|
|
|
1329 mouse moves. That function calls @code{set-frame-pointer}, which sets
|
|
|
1330 the current mouse pointer for a frame.
|
|
|
1331
|
|
|
1332 @defun set-frame-pointer frame image-instance
|
|
|
1333 This function sets the mouse pointer of @var{frame} to the given pointer
|
|
|
1334 image instance. You should not call this function directly.
|
|
2
|
1335 (If you do, the pointer will change again the next time the mouse moves.)
|
|
0
|
1336 @end defun
|
|
|
1337
|
|
|
1338 @node Redisplay Glyphs
|
|
|
1339 @section Redisplay Glyphs
|
|
|
1340
|
|
|
1341 @defvr Glyph truncation-glyph
|
|
|
1342 This variable specifies what is displayed at the end of truncated lines.
|
|
|
1343 @end defvr
|
|
|
1344
|
|
|
1345 @defvr Glyph continuation-glyph
|
|
|
1346 This variable specifies what is displayed at the end of wrapped lines.
|
|
|
1347 @end defvr
|
|
|
1348
|
|
|
1349 @defvr Glyph octal-escape-glyph
|
|
|
1350 This variable specifies what to prefix character codes displayed in octal
|
|
|
1351 with.
|
|
|
1352 @end defvr
|
|
|
1353
|
|
|
1354 @defvr Glyph hscroll-glyph
|
|
|
1355 This variable specifies what to display at the beginning of horizontally
|
|
|
1356 scrolled lines.
|
|
|
1357 @end defvr
|
|
|
1358
|
|
|
1359 @defvr Glyph invisible-text-glyph
|
|
|
1360 This variable specifies what to use to indicate the presence of
|
|
|
1361 invisible text. This is the glyph that is displayed when an ellipsis is
|
|
|
1362 called for, according to @code{selective-display-ellipses} or
|
|
|
1363 @code{buffer-invisibility-spec}). Normally this is three dots (``...'').
|
|
|
1364 @end defvr
|
|
|
1365
|
|
|
1366 @defvr Glyph control-arrow-glyph
|
|
|
1367 This variable specifies what to use as an arrow for control characters.
|
|
|
1368 @end defvr
|
|
|
1369
|
|
|
1370 @node Subwindows
|
|
|
1371 @section Subwindows
|
|
|
1372
|
|
|
1373 Subwindows are not currently implemented.
|
|
|
1374
|
|
|
1375 @defun subwindowp object
|
|
|
1376 This function returns non-@code{nil} if @var{object} is a subwindow.
|
|
|
1377 @end defun
|
