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428
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1 /* Emacs shell widget -- define the two widgets.
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2 Copyright (C) 1994, 1995 Sun Microsystems, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* Written by Ben Wing, May, 1994. */
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24
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25 /*
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26 It is rather unfortunate that we have to do this. Blame those
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27 short-sighted people who designed the monstrosities known as
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28 Xt and ICCCM.
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29 */
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30
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31 /*
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32 This widget is not actually Emacs-specific; perhaps there could
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33 be a better name than "EmacsShell". What it does is work around
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34 a limitation in Xt in correctly dealing with the window-manager
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35 size hints with applications that
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36
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37 (a) dynamically change their window size
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38 (b) have a cell size (width-inc and height-inc) other than 1
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39
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40 and
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41
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42 (c) cannot predict in advance exactly what size their shell will be
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43 (This is the more common situation, when you have a number
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44 of widgets, each with their own size ideas)
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45
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46 This widget assumes that your program contains a fixed "base size"
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47 plus some number of cells (e.g. character cells). The WMShell
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48 resources "widthInc" and "heightInc" specify the size of a
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49 character cell, and the window manager will report the app's
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50 size in cells rather than in pixels.
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51
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52 If you use this widget, do not use the WMShell resources
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53 "baseWidth", "baseHeight", "minWidth", or "minHeight".
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54 Instead, use "widthCells" and "heightCells" to specify the
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55 current size in cells (you must keep this up-to-date),
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56 and "minWidthCells" and "minHeightCells" to specify the
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57 minimum size in cells.
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58
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59 Every time that the program issues a size command, the
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60 "baseWidth", "baseHeight", "minWidth", and "minHeight" fields
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61 of the WM_NORMAL_HINTS property will be updated to stay in
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62 line with the resource values specified above. The calculations
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63 are done once the desired shell size is known but before the
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64 window-manager size-change request is issued. (We must do it
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65 at this time because before then we don't know what size we
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66 will request, and after the request the deed has already
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67 been done.)
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68
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69 After you change the "baseWidth", "baseHeight", "minWidth",
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70 or "minHeight" resources, you need to call
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71 EmacsShellUpdateSizeHints() to manually update the size
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72 hints, except in the following two circumstances:
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73
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74 (a) you are about to make a geometry request.
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75 (b) you are changing only "baseWidth" and "baseHeight"
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76 from within a resize procedure. (In this case,
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77 the size hints are already correct.)
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78
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79 */
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80
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81 #include <config.h>
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82
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83 #include <stdio.h>
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84 #include <stdlib.h>
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85 #include <X11/StringDefs.h>
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86 #include "xintrinsicp.h"
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87 #include <X11/Shell.h>
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88 #include <X11/ShellP.h>
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89 #include <X11/Vendor.h>
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90 #include <X11/VendorP.h>
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91 #include "EmacsShellP.h"
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92
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93 #if defined (DEFINE_TOP_LEVEL_EMACS_SHELL)
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94 #define EMACS_SHELL_WIDGET TopLevelEmacsShellWidget
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95 #define SUPERCLASS_WIDGET_CLASS topLevelShellWidgetClass
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96 #define SUPERCLASS_CLASS_REC topLevelShellClassRec
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97 #define EMACS_SHELL_REC TopLevelEmacsShellRec
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98 #define EMACS_SHELL_CLASS_REC topLevelEmacsShellClassRec
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99 #define EMACS_SHELL_CLASS_REC_TYPE TopLevelEmacsShellClassRec
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100 #define EMACS_SHELL_CLASS_NAME "TopLevelEmacsShell"
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101 #define EMACS_SHELL_WIDGET_CLASS topLevelEmacsShellWidgetClass
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102 #define EMACS_SHELL_UPDATE_SIZE_HINTS TopLevelEmacsShellUpdateSizeHints
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103 #elif defined (DEFINE_TRANSIENT_EMACS_SHELL)
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104 #define EMACS_SHELL_WIDGET TransientEmacsShellWidget
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105 #define SUPERCLASS_WIDGET_CLASS transientShellWidgetClass
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106 #define SUPERCLASS_CLASS_REC transientShellClassRec
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107 #define EMACS_SHELL_REC TransientEmacsShellRec
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108 #define EMACS_SHELL_CLASS_REC transientEmacsShellClassRec
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109 #define EMACS_SHELL_CLASS_REC_TYPE TransientEmacsShellClassRec
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110 #define EMACS_SHELL_CLASS_NAME "TransientEmacsShell"
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111 #define EMACS_SHELL_WIDGET_CLASS transientEmacsShellWidgetClass
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112 #define EMACS_SHELL_UPDATE_SIZE_HINTS TransientEmacsShellUpdateSizeHints
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113 #else
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114 Error. Must define either DEFINE_TOP_LEVEL_EMACS_SHELL or
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115 DEFINE_TRANSIENT_EMACS_SHELL.
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116 #endif
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117
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118 typedef struct {
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119 XtPointer next_extension;
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120 XrmQuark record_type;
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121 long version;
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122 Cardinal record_size;
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123 } GenericClassExtRec;
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124
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125 static XtGeometryResult RootGeometryManager (Widget gw,
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126 XtWidgetGeometry *request, XtWidgetGeometry *reply);
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127 static void ChangeManaged (Widget w);
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128
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129 /* snarfed from Shell.c */
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130 #define BIGSIZE ((Dimension)32767)
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131
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132 static XtResource resources[] = {
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133 #define offset(field) XtOffset(EMACS_SHELL_WIDGET, emacs_shell.field)
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134 #define coreoffset(field) XtOffset(EMACS_SHELL_WIDGET, core.field)
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135 #ifdef LWLIB_USES_MOTIF
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136 /* *** BOGOSITY^10! *** The Motif VendorShell fucks around with
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137 the default values for X and Y, for no obvious reason. This
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138 causes Shell to indicate that the defaults of (0,0) were
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139 program-specified, instead of letting the WM do what it wants. */
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440
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140 { XtNx, XtCPosition,
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141 XtRPosition, sizeof (Position),
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142 coreoffset (x), XtRImmediate, (XtPointer)BIGSIZE },
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143 { XtNy, XtCPosition,
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144 XtRPosition, sizeof (Position),
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145 coreoffset (y), XtRImmediate, (XtPointer)BIGSIZE },
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428
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146 #endif
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440
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147 { XtNwidthCells, XtCWidthCells,
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148 XtRInt, sizeof (int),
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149 offset (width_cells), XtRImmediate, (XtPointer)0 },
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150 { XtNheightCells, XtCHeightCells,
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151 XtRInt, sizeof (int),
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152 offset (height_cells), XtRImmediate, (XtPointer)0 },
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153 { XtNminWidthCells, XtCMinWidthCells,
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154 XtRInt, sizeof (int),
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155 offset (min_width_cells), XtRImmediate, (XtPointer)0 },
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156 { XtNminHeightCells, XtCMinHeightCells,
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157 XtRInt, sizeof (int),
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158 offset (min_height_cells), XtRImmediate, (XtPointer)0 },
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428
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159 };
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160
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161 static CompositeClassExtensionRec compositeClassExtRec = {
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162 NULL,
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163 NULLQUARK,
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164 XtCompositeExtensionVersion,
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440
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165 sizeof (CompositeClassExtensionRec),
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428
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166 TRUE,
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167 };
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168
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169 static ShellClassExtensionRec shellClassExtRec = {
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170 NULL,
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171 NULLQUARK,
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172 XtShellExtensionVersion,
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440
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173 sizeof (ShellClassExtensionRec),
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428
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174 RootGeometryManager
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175 };
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176
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177 EMACS_SHELL_CLASS_REC_TYPE EMACS_SHELL_CLASS_REC = {
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178 { /*
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179 * core_class fields
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180 */
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181 /* superclass */ (WidgetClass) &SUPERCLASS_CLASS_REC,
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182 /* class_name */ (String) EMACS_SHELL_CLASS_NAME,
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440
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183 /* size */ sizeof (EMACS_SHELL_REC),
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428
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184 /* Class Initializer */ NULL,
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185 /* class_part_initialize*/ NULL, /* XtInheritClassPartInitialize, */
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186 /* Class init'ed ? */ FALSE,
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187 /* initialize */ NULL,
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188 /* initialize_notify */ NULL,
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189 /* realize */ XtInheritRealize,
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190 /* actions */ NULL,
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191 /* num_actions */ 0,
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192 /* resources */ resources,
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193 /* resource_count */ XtNumber (resources),
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194 /* xrm_class */ NULLQUARK,
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195 /* compress_motion */ FALSE,
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196 /* compress_exposure */ TRUE,
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197 /* compress_enterleave*/ FALSE,
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198 /* visible_interest */ TRUE,
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199 /* destroy */ NULL,
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200 /* resize */ XtInheritResize,
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201 /* expose */ NULL,
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202 /* set_values */ NULL, /* XtInheritSetValues, */
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203 /* set_values_hook */ NULL,
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204 /* set_values_almost */ XtInheritSetValuesAlmost,
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205 /* get_values_hook */ NULL,
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206 /* accept_focus */ NULL,
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207 /* intrinsics version */ XtVersion,
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208 /* callback offsets */ NULL,
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209 /* tm_table */ NULL,
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210 /* query_geometry */ NULL,
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211 /* display_accelerator*/ NULL,
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212 /* extension */ NULL
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213 },{ /* Composite */
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214 /* geometry_manager */ XtInheritGeometryManager,
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215 /* change_managed */ ChangeManaged,
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216 /* insert_child */ XtInheritInsertChild,
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217 /* delete_child */ XtInheritDeleteChild,
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218 /* extension */ (XtPointer)&compositeClassExtRec
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219 },{ /* Shell */
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220 /* extension */ (XtPointer)&shellClassExtRec
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221 },{ /* WMShell */
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222 /* extension */ NULL
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223 },{ /* VendorShell */
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224 /* extension */ NULL
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225 },{ /* TopLevelShell or TransientShell */
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226 /* both have exactly one XtPointer here. */
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227 /* extension */ NULL
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228 },{ /* EmacsShell */
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229 0
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230 }
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231 };
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232
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233 WidgetClass EMACS_SHELL_WIDGET_CLASS = (WidgetClass) &EMACS_SHELL_CLASS_REC;
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234
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235 static void
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236 update_size_hints_internal (EMACS_SHELL_WIDGET w,
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237 int width, int height)
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238 {
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239 int base_width, base_height;
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240 int cell_width, cell_height;
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241 Arg al [10];
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242
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243 /* time to update them thar size hints */
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244 cell_width = w->wm.size_hints.width_inc;
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245 cell_height = w->wm.size_hints.height_inc;
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246 base_width = width - cell_width * w->emacs_shell.width_cells;
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247 base_height = height - cell_height * w->emacs_shell.height_cells;
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248 #ifdef DEBUG_GEOMETRY_MANAGEMENT
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249 /* Very useful info when debugging geometry management problems.
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250 When it's guaranteed that no more such problems exist, take
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251 this stuff out. */
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252 printf ("update_size_hints_internal:\n");
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253 printf (" actual pixel size: %d %d\n", width, height);
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254 printf (" cell size in pixels: %d %d\n", cell_width, cell_height);
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255 printf (" text area size in cells: %d %d\n", w->emacs_shell.width_cells,
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256 w->emacs_shell.height_cells);
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257 printf (" base size set to: %d %d\n", base_width, base_height);
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258 fflush (stdout);
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259 #endif
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260 XtSetArg(al [0], XtNbaseWidth, base_width);
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261 XtSetArg(al [1], XtNbaseHeight, base_height);
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262 XtSetArg(al [2], XtNminWidth, base_width +
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263 cell_width * w->emacs_shell.min_width_cells);
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264 XtSetArg(al [3], XtNminHeight, base_height +
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265 cell_height * w->emacs_shell.min_height_cells);
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266 XtSetValues ((Widget) w, al, 4);
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267 }
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268
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269 static XtGeometryResult
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270 SuperClassRootGeometryManager (Widget gw,
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271 XtWidgetGeometry *request,
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272 XtWidgetGeometry *reply)
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273 {
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274 ShellWidgetClass swc = (ShellWidgetClass) SUPERCLASS_WIDGET_CLASS;
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275 ShellClassExtensionRec *scer;
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276 GenericClassExtRec *gcer;
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277
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278 /* find the shell extension record that specifies the
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279 root geometry manager method */
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280 for (gcer = (GenericClassExtRec *) swc->shell_class.extension;
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281 gcer;
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282 gcer = (GenericClassExtRec *) gcer->next_extension)
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283 {
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284 if (gcer->record_type == NULLQUARK)
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285 break;
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286 }
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287
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288 if (!gcer)
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289 abort ();
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290
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291 /* call it to actually make the geometry request */
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292 scer = (ShellClassExtensionRec *) gcer;
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293 return (scer->root_geometry_manager)(gw, request, reply);
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294 }
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295
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296 static XtGeometryResult
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297 RootGeometryManager (Widget gw,
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298 XtWidgetGeometry *request,
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299 XtWidgetGeometry *reply)
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300 {
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301 EMACS_SHELL_WIDGET w = (EMACS_SHELL_WIDGET) gw;
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302 /* OK since this file is not dumped */
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303 static int reentrant = 0;
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304 XtGeometryResult result;
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305
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306 if (reentrant)
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307 abort ();
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308 reentrant++;
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309
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310 #ifdef DEBUG_GEOMETRY_MANAGEMENT
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311 printf ("root_geometry_manager:\n");
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312 printf (" current shell size: %d %d\n", w->core.width, w->core.height);
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313 if (request->request_mode & CWWidth)
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314 printf ("width requested;");
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315 if (request->request_mode & CWHeight)
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316 printf ("height requested;");
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317 printf ("\n");
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318 printf (" requested shell size: %d %d\n", request->width, request->height);
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319 #endif
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320 /* update the size hints */
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321 update_size_hints_internal (w,
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322 request->request_mode & CWWidth ?
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323 request->width : w->core.width,
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324 request->request_mode & CWHeight ?
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325 request->height : w->core.height);
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326
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327 result = SuperClassRootGeometryManager (gw, request, reply);
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328
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329 #ifdef DEBUG_GEOMETRY_MANAGEMENT
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330 printf (" result: %s\n",
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331 result == XtGeometryYes ? "XtGeometryYes" :
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332 result == XtGeometryNo ? "XtGeometryNo" :
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333 result == XtGeometryAlmost ? "XtGeometryAlmost" :
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334 "XtGeometryDone");
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335 if (reply->request_mode & CWWidth)
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336 printf ("width returned;");
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337 if (reply->request_mode & CWHeight)
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338 printf ("height returned;");
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339 printf ("\n");
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340 printf (" resulting shell size: %d %d\n", reply->width, reply->height);
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341 printf ("----------\n");
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342 fflush (stdout);
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343 #endif
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344 reentrant--;
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345 return result;
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346 }
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347
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348 static void
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349 ChangeManaged (Widget wid)
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350 {
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351 EMACS_SHELL_WIDGET w = (EMACS_SHELL_WIDGET) wid;
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352
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353 /* If not realized, then we're being called from XtRealizeWidget().
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354 RootGeometryManager() has not yet been called, and thus our
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355 base size is incorrect. We need to set it now or the Shell
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356 will mess up geometry specifications with negative positional
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357 offsets. */
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358 if (!XtIsRealized (wid))
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359 {
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360 Widget child = NULL;
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361 Cardinal i;
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362
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363 /* the managed child indicates what our size is */
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364 for (i = 0; i < w->composite.num_children; i++) {
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365 if (XtIsManaged(w->composite.children[i])) {
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366 child = w->composite.children[i];
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367 break;
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368 }
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369 }
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370
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371 update_size_hints_internal (w, child->core.width, child->core.height);
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372 }
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373
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374 /* call the real ChangeManaged */
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375 (((ShellWidgetClass) SUPERCLASS_WIDGET_CLASS)->
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376 composite_class.change_managed)(wid);
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377 }
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378
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379
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380 /******************* external entry points *********************/
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381
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382 void
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383 EMACS_SHELL_UPDATE_SIZE_HINTS (Widget gw)
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384 {
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385 EMACS_SHELL_WIDGET w = (EMACS_SHELL_WIDGET) gw;
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386 update_size_hints_internal (w, w->core.width, w->core.height);
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387 }
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