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428
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1 /* Window definitions for XEmacs.
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2 Copyright (C) 1985, 1986, 1992, 1993, 1994, 1995
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3 Free Software Foundation, Inc.
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4 Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.
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5 Copyright (C) 1995, 1996 Ben Wing.
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6 Copyright (C) 1996 Chuck Thompson.
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7
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8 This file is part of XEmacs.
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9
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10 XEmacs is free software; you can redistribute it and/or modify it
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11 under the terms of the GNU General Public License as published by the
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12 Free Software Foundation; either version 2, or (at your option) any
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13 later version.
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14
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15 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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18 for more details.
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19
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20 You should have received a copy of the GNU General Public License
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21 along with XEmacs; see the file COPYING. If not, write to
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22 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 Boston, MA 02111-1307, USA. */
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24
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25 /* Synched up with: FSF 19.30. */
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26
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27 #ifndef _XEMACS_WINDOW_H_
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28 #define _XEMACS_WINDOW_H_
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29
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30 #include "redisplay.h"
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31 #ifdef HAVE_SCROLLBARS
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32 #include "scrollbar.h"
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33 #endif
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34
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35 /* All windows in use are arranged into a tree, with pointers up and down.
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36
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37 Windows that are leaves of the tree are actually displayed
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38 and show the contents of buffers. Windows that are not leaves
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39 are used for representing the way groups of leaf windows are
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40 arranged on the frame. Leaf windows never become non-leaves.
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41 They are deleted only by calling delete-window on them (but
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42 this can be done implicitly). Combination windows can be created
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43 and deleted at any time.
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44
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45 A leaf window has a non-nil buffer field, and also
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46 has markers in its start and pointm fields. Non-leaf windows
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47 have nil in these fields.
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48
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49 Non-leaf windows are either vertical or horizontal combinations.
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50
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51 A vertical combination window has children that are arranged on the frame
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52 one above the next. Its vchild field points to the uppermost child.
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53 The parent field of each of the children points to the vertical
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54 combination window. The next field of each child points to the
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55 child below it, or is nil for the lowest child. The prev field
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56 of each child points to the child above it, or is nil for the
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57 highest child.
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58
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59 A horizontal combination window has children that are side by side.
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60 Its hchild field points to the leftmost child. In each child
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61 the next field points to the child to the right and the prev field
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62 points to the child to the left.
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63
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64 The children of a vertical combination window may be leaf windows
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65 or horizontal combination windows. The children of a horizontal
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66 combination window may be leaf windows or vertical combination windows.
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67
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68 At the top of the tree are two windows which have nil as parent.
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69 The second of these is minibuf_window. The first one manages all
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70 the frame area that is not minibuffer, and is called the root window.
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71 Different windows can be the root at different times;
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72 initially the root window is a leaf window, but if more windows
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73 are created then that leaf window ceases to be root and a newly
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74 made combination window becomes root instead.
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75
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76 In any case, on screens which have an ordinary window and a
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77 minibuffer, prev of the minibuf window is the root window and next of
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78 the root window is the minibuf window. On minibufferless screens or
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79 minibuffer-only screens, the root window and the minibuffer window are
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80 one and the same, so its prev and next members are nil.
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81
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82 A dead window has the `dead' flag set on it. Note that unlike other
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83 dead objects, dead windows can be made live again through restoring a
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84 window configuration. This means that the values in a dead window
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85 need to be preserved, except for those that are reconstructed by from
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86 the window configuration. */
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87
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88 struct window
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89 {
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90 struct lcrecord_header header;
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91
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92 /* The frame this window is on. */
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93 Lisp_Object frame;
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94 /* t if this window is a minibuffer window. */
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95 Lisp_Object mini_p;
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96 /* Following child (to right or down) at same level of tree */
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97 Lisp_Object next;
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98 /* Preceding child (to left or up) at same level of tree */
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99 Lisp_Object prev;
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100 /* First child of this window. */
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101 /* vchild is used if this is a vertical combination,
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102 hchild if this is a horizontal combination. */
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103 Lisp_Object hchild, vchild;
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104 /* The window this one is a child of. */
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105 Lisp_Object parent;
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106
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107 /* The upper left corner coordinates of this window,
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108 as integers (pixels) relative to upper left corner of frame = 0, 0 */
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109 int pixel_left;
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110 int pixel_top;
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111 /* The size of the window (in pixels) */
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112 int pixel_height;
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113 int pixel_width;
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114
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115 /* The buffer displayed in this window */
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116 /* Of the fields vchild, hchild and buffer, only one is non-nil. */
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117 Lisp_Object buffer;
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118 /* A marker pointing to where in the text to start displaying */
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119 /* need one for each set of display structures */
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120 Lisp_Object start[3];
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121 /* A marker pointing to where in the text point is in this window,
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122 used only when the window is not selected.
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123 This exists so that when multiple windows show one buffer
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124 each one can have its own value of point. */
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125 /* need one for each set of display structures */
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126 Lisp_Object pointm[3];
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127 /* A marker pointing to where in the text the scrollbar is pointing */
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128 Lisp_Object sb_point;
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129 /* Number of columns display within the window is scrolled to the left. */
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130 int hscroll;
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131 /* Idem for the window's modeline */
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132 int modeline_hscroll;
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133 /* Amount to clip off the top line for pixel-based scrolling. Point
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134 will remain constant but this will be incremented to
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135 incrementally shift lines up. */
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136 int top_yoffset;
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137 /* Amount to clip off the left of the lines for pixel-based
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138 scrolling. Hscroll will remain constant but this will be
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139 incremented to incrementally shift lines left.*/
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140 int left_xoffset;
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141 /* Number saying how recently window was selected */
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142 Lisp_Object use_time;
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143 /* text.modified of displayed buffer as of last time display completed */
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144 Lisp_Object last_modified[3];
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145 /* Value of point at that time */
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146 Lisp_Object last_point[3];
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147 /* Value of start at that time */
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148 Lisp_Object last_start[3];
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149 /* buf.face_change as of last time display completed */
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150 Lisp_Object last_facechange[3];
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151
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152 /* face cache elements correct for this window and its current buffer */
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153 face_cachel_dynarr *face_cachels;
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154 /* glyph cache elements correct for this window and its current buffer */
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155 glyph_cachel_dynarr *glyph_cachels;
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156 /* we cannot have a per-device cache of widgets / subwindows because
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157 each visible instance needs to be a separate instance. The lowest
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158 level of granularity we can get easily is the window that the
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159 subwindow is in. This will fail if we attach the same subwindow
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160 twice to a buffer. However, we are quite unlikely to do this,
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161 especially with buttons which will need individual callbacks. The
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162 proper solution is probably not worth the effort. */
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163 Lisp_Object subwindow_instance_cache;
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164 /* List of starting positions for display lines. Only valid if
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165 buffer has not changed. */
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166 line_start_cache_dynarr *line_start_cache;
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167 Lisp_Object line_cache_last_updated;
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168 int line_cache_validation_override;
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169
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170 /* Length of longest line currently displayed. Used to control the
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171 width of the horizontal scrollbars. */
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172 int max_line_len;
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173
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174 /* Frame coords of point at that time */
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175 int last_point_x[3];
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176 int last_point_y[3];
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177
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178 /* Number of characters in buffer past bottom of window,
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179 as of last redisplay that finished. */
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180 /* need one for each set of display structures */
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181 int window_end_pos[3];
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182
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183 /* If redisplay in this window goes beyond this buffer position,
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184 must run the redisplay-end-trigger-functions. */
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185 Lisp_Object redisplay_end_trigger;
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186
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187 /* Set by redisplay to the last position seen. This is used
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188 to implement the redisplay-end-trigger-functions. */
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189 Bufpos last_redisplay_pos;
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190
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191 #define WINDOW_SLOT_DECLARATION
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192 #define WINDOW_SLOT(slot, compare) Lisp_Object slot
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193 #include "winslots.h"
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194
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195 /* one-bit flags: */
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196
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197 /* marker used when restoring a window configuration */
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198 unsigned int config_mark :1;
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199 /* Non-zero means window was dead. */
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200 unsigned int dead :1;
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201 /* Non-zero means next redisplay must use the value of start
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202 set up for it in advance. Set by scrolling commands. */
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203 unsigned int force_start :1;
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204 /* Non-zero means must regenerate modeline of this window */
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205 unsigned int redo_modeline :1;
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206 /* Non-zero means current value of `start'
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207 was the beginning of a line when it was chosen. */
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208 unsigned int start_at_line_beg :1;
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209 /* new redisplay flag */
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210 unsigned int windows_changed :1;
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211 unsigned int shadow_thickness_changed :1;
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212 /* Vertical divider flag and validity of it */
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213 unsigned int need_vertical_divider_p :1;
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214 unsigned int need_vertical_divider_valid_p :1;
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215 };
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216
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217 #define CURRENT_DISP 0
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218 #define DESIRED_DISP 1
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219 #define CMOTION_DISP 2
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220
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221 struct window_mirror
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222 {
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223 /* Frame this mirror is on. */
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224 struct frame *frame;
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225
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226 /* Following child (to right or down) at same level of tree */
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227 struct window_mirror *next;
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228
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229 /* There is no prev field because we never traverse this structure
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230 backwards. Same goes for the parent field. */
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231
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232 /* First child of this window. */
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233 /* vchild is used if this is a vertical combination,
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234 hchild if this is a horizontal combination. */
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235 struct window_mirror *hchild, *vchild;
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236
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237 /* Dynamic array of display lines */
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238 display_line_dynarr *current_display_lines;
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239 display_line_dynarr *desired_display_lines;
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240
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241 /* Buffer current_display_lines represent. */
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242 struct buffer *buffer;
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243
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244 #ifdef HAVE_SCROLLBARS
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245 /* Scrollbars associated with window, if any. */
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246 struct scrollbar_instance *scrollbar_vertical_instance;
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247 struct scrollbar_instance *scrollbar_horizontal_instance;
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248 #endif /* HAVE_SCROLLBARS */
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249
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250 /* Flag indicating whether a subwindow is currently being displayed. */
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251 unsigned int subwindows_being_displayed :1;
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252
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253 /* Keep track of the truncation status in this window so we can
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254 detect when it has changed. #### Magic variables would be a huge
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255 win here. */
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256 unsigned int truncate_win :1;
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257 };
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258
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259 #ifdef emacs /* some things other than emacs want the structs */
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260
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261 DECLARE_LRECORD (window, struct window);
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262 #define XWINDOW(x) XRECORD (x, window, struct window)
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263 #define XSETWINDOW(x, p) XSETRECORD (x, p, window)
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264 #define WINDOWP(x) RECORDP (x, window)
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265 #define CHECK_WINDOW(x) CHECK_RECORD (x, window)
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266 #define CONCHECK_WINDOW(x) CONCHECK_RECORD (x, window)
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267
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268 #define WINDOW_LIVE_P(x) (!(x)->dead)
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269 #define CHECK_LIVE_WINDOW(x) do { \
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270 CHECK_WINDOW (x); \
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271 if (!WINDOW_LIVE_P (XWINDOW (x))) \
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272 dead_wrong_type_argument (Qwindow_live_p, (x)); \
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273 } while (0)
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274 #define CONCHECK_LIVE_WINDOW(x) do { \
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275 CONCHECK_WINDOW (x); \
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276 if (!WINDOW_LIVE_P (XWINDOW (x))) \
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277 x = wrong_type_argument (Qwindow_live_p, (x)); \
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278 } while (0)
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279
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280 /* 1 if W is a minibuffer window. */
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281 #define MINI_WINDOW_P(W) (!NILP ((W)->mini_p))
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282
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283 /* 1 if we are dealing with a parentless window (this includes the
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284 root window on a frame and the minibuffer window; both of these
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285 are siblings). */
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286 #define TOP_LEVEL_WINDOW_P(w) NILP ((w)->parent)
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287
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288 /* Set all redisplay flags indicating a window has changed */
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289 #define MARK_WINDOWS_CHANGED(w) do { \
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290 (w)->windows_changed = 1; \
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291 if (!NILP (w->frame)) \
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292 { \
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293 struct frame *mwc_frame = XFRAME (w->frame); \
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294 MARK_FRAME_WINDOWS_CHANGED (mwc_frame); \
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295 } \
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296 else \
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297 windows_changed = 1; \
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298 } while (0)
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299
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300 #define WINDOW_TTY_P(w) FRAME_TTY_P (XFRAME ((w)->frame))
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301 #define WINDOW_X_P(w) FRAME_X_P (XFRAME ((w)->frame))
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302 #define WINDOW_NS_P(w) FRAME_NS_P (XFRAME ((w)->frame))
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303 #define WINDOW_WIN_P(w) FRAME_WIN_P (XFRAME ((w)->frame))
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304
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305 DECLARE_LRECORD (window_configuration, struct window_config);
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306
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307 EXFUN (Fget_buffer_window, 3);
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308 EXFUN (Fmove_to_window_line, 2);
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309 EXFUN (Frecenter, 2);
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310 EXFUN (Freplace_buffer_in_windows, 1);
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311 EXFUN (Fselect_window, 2);
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312 EXFUN (Fselected_window, 1);
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313 EXFUN (Fset_window_buffer, 2);
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314 EXFUN (Fset_window_hscroll, 2);
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315 EXFUN (Fset_window_point, 2);
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316 EXFUN (Fset_window_start, 3);
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317 EXFUN (Fwindow_buffer, 1);
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318 EXFUN (Fwindow_highest_p, 1);
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319 EXFUN (Fwindow_point, 1);
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320 EXFUN (Fwindow_start, 1);
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321
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322 /* The minibuffer window of the selected frame.
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323 Note that you cannot test for minibufferness of an arbitrary window
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324 by comparing against this; but you can test for minibufferness of
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325 the selected window or of any window that is displayed. */
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326 extern Lisp_Object minibuf_window;
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327
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328 /* Prompt to display in front of the minibuffer contents, or nil */
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329 extern Lisp_Object Vminibuf_prompt;
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330 /* Prompt to display in front of the minibuffer prompt, or nil */
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331 extern Lisp_Object Vminibuf_preprompt;
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332
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333 Lisp_Object allocate_window (void);
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334 int window_char_width (struct window *, int include_margins_p);
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335 int window_char_height (struct window *, int include_gutters_p);
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336 int window_displayed_height (struct window *);
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337 int window_is_leftmost (struct window *w);
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338 int window_is_rightmost (struct window *w);
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339 int window_is_lowest (struct window *w);
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340 int window_is_highest (struct window *w);
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341 int window_truncation_on (struct window *w);
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342 int window_needs_vertical_divider (struct window *);
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343 int window_scrollbar_width (struct window *w);
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344 int window_scrollbar_height (struct window *w);
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345 int window_modeline_height (struct window *w);
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346 int window_left_margin_width (struct window *w);
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347 int window_right_margin_width (struct window *w);
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348 int window_top_gutter_height (struct window *w);
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349 int window_bottom_gutter_height (struct window *w);
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350 int window_left_gutter_width (struct window *w, int modeline);
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351 int window_right_gutter_width (struct window *w, int modeline);
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352
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353 void delete_all_subwindows (struct window *w);
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354 void set_window_pixheight (Lisp_Object window, int pixheight,
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355 int nodelete);
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356 void set_window_pixwidth (Lisp_Object window, int pixwidth,
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357 int nodelete);
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358 void window_scroll (Lisp_Object window, Lisp_Object n, int direction,
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359 Error_behavior errb);
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360 int buffer_window_count (struct buffer *b, struct frame *f);
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361 int buffer_window_mru (struct window *w);
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362 void check_frame_size (struct frame *frame, int *rows, int *cols);
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363 struct window *decode_window (Lisp_Object window);
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364 struct window *find_window_by_pixel_pos (int pix_x, int pix_y, Lisp_Object win);
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365
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366 /* new functions to handle the window mirror */
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367 void free_window_mirror (struct window_mirror *mir);
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368 Lisp_Object real_window (struct window_mirror *mir, int no_abort);
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369 struct window_mirror *find_window_mirror (struct window *w);
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370 display_line_dynarr *window_display_lines (struct window *w, int);
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371 struct buffer *window_display_buffer (struct window *w);
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372 void set_window_display_buffer (struct window *w, struct buffer *b);
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373 void update_frame_window_mirror (struct frame *f);
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374
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375 int map_windows (struct frame *f,
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376 int (*mapfun) (struct window *w, void *closure),
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377 void *closure);
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378 void some_window_value_changed (Lisp_Object specifier, struct window *w,
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379 Lisp_Object oldval);
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380 int invalidate_vertical_divider_cache_in_window (struct window *w,
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381 void *u_n_u_s_e_d);
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382 int window_divider_width (struct window *w);
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383
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384 #define WINDOW_FRAME(w) ((w)->frame)
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385 #define WINDOW_BUFFER(w) ((w)->buffer)
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386 #define WINDOW_DEVICE(w) FRAME_DEVICE (XFRAME (WINDOW_FRAME (w)))
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387 #define WINDOW_CONSOLE(w) DEVICE_CONSOLE (XDEVICE (WINDOW_DEVICE (w)))
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388
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389 /* XEmacs window size and positioning macros. */
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390 #define WINDOW_TOP(w) ((w)->pixel_top)
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391 #define WINDOW_TEXT_TOP(w) (WINDOW_TOP (w) + window_top_gutter_height (w))
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392 #define WINDOW_TEXT_TOP_CLIP(w) ((w)->top_yoffset)
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393 #define WINDOW_BOTTOM(w) ((w)->pixel_top + (w)->pixel_height)
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394 #define WINDOW_TEXT_BOTTOM(w) (WINDOW_BOTTOM (w) - window_bottom_gutter_height (w))
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395 #define WINDOW_LEFT(w) ((w)->pixel_left)
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396 #define WINDOW_TEXT_LEFT(w) (WINDOW_LEFT (w) + window_left_gutter_width (w, 0))
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397 #define WINDOW_MODELINE_LEFT(w) \
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398 (WINDOW_LEFT (w) + window_left_gutter_width (w, 1))
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399 #define WINDOW_RIGHT(w) ((w)->pixel_left + (w)->pixel_width)
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400 #define WINDOW_TEXT_RIGHT(w) \
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401 (WINDOW_RIGHT (w) - window_right_gutter_width (w, 0))
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402 #define WINDOW_MODELINE_RIGHT(w) \
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403 (WINDOW_RIGHT (w) - window_right_gutter_width (w, 1))
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404
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405 #define WINDOW_HEIGHT(w) ((w)->pixel_height)
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406 #define WINDOW_TEXT_HEIGHT(w) (WINDOW_TEXT_BOTTOM (w) - WINDOW_TEXT_TOP (w))
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407 #define WINDOW_WIDTH(w) ((w)->pixel_width)
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408 #define WINDOW_TEXT_WIDTH(w) (WINDOW_TEXT_RIGHT (w) - WINDOW_TEXT_LEFT (w))
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409
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410 #define WINDOW_HAS_MODELINE_P(w) (!NILP (w->has_modeline_p))
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411
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412 #define MODELINE_OFF_SHADOW_THICKNESS_ADJUSTED(win) \
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413 abs ((!WINDOW_HAS_MODELINE_P (win) \
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414 ? ((XINT (win->modeline_shadow_thickness) > 1) \
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415 ? XINT (win->modeline_shadow_thickness) - 1 \
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416 : ((XINT (win->modeline_shadow_thickness) < -1) \
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417 ? XINT (win->modeline_shadow_thickness) + 1 \
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418 : XINT (win->modeline_shadow_thickness))) \
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419 : XINT (win->modeline_shadow_thickness)))
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420
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421 #define MODELINE_SHADOW_THICKNESS(win) \
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422 (MODELINE_OFF_SHADOW_THICKNESS_ADJUSTED (win) > 10 \
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423 ? 10 \
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424 : MODELINE_OFF_SHADOW_THICKNESS_ADJUSTED (win))
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425
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426 #endif /* emacs */
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427
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428 #endif /* _XEMACS_WINDOW_H_ */
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