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1 /* Defines some widget utility functions.
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2 Copyright (C) 1992 Lucid, Inc.
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3
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4 This file is part of the Lucid Widget Library.
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5
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6 The Lucid Widget Library is free software; you can redistribute it and/or
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7 modify it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 1, or (at your option)
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9 any later version.
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10
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11 The Lucid Widget Library is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License 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 GNU Emacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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19
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20 #include <stdlib.h>
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21 #include <unistd.h>
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22 #include <string.h>
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23 #include <memory.h>
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24
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25 #include <X11/Xatom.h>
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26 #include <X11/IntrinsicP.h>
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27 #include <X11/ObjectP.h>
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28 #include "lwlib-utils.h"
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29
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30 /* Redisplay the contents of the widget, without first clearing it. */
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31 void
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32 XtNoClearRefreshWidget (Widget widget)
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33 {
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34 XEvent event;
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35
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36 event.type = Expose;
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37 event.xexpose.serial = 0;
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38 event.xexpose.send_event = 0;
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39 event.xexpose.display = XtDisplay (widget);
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40 event.xexpose.window = XtWindow (widget);
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41 event.xexpose.x = 0;
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42 event.xexpose.y = 0;
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43 event.xexpose.width = widget->core.width;
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44 event.xexpose.height = widget->core.height;
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45 event.xexpose.count = 0;
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46
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47 (*widget->core.widget_class->core_class.expose)
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48 (widget, &event, (Region)NULL);
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49 }
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50
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51
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52 /*
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53 * Apply a function to all the subwidgets of a given widget recursively.
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54 */
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55 void
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56 XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg)
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57 {
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58 if (XtIsComposite (w))
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59 {
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60 CompositeWidget cw = (CompositeWidget) w;
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61 /* We have to copy the children list before mapping over it, because
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62 the procedure might add/delete elements, which would lose badly.
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63 */
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64 int nkids = cw->composite.num_children;
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65 Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids);
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66 int i;
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67 memcpy (kids, cw->composite.children, sizeof (Widget) * nkids);
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68 for (i = 0; i < nkids; i++)
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69 /* This prevent us from using gadgets, why is it here? */
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70 /* if (XtIsWidget (kids [i])) */
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71 {
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72 /* do the kiddies first in case we're destroying */
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73 XtApplyToWidgets (kids [i], proc, arg);
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74 proc (kids [i], arg);
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75 }
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76 free (kids);
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77 }
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78 }
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79
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80
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81 /*
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82 * Apply a function to all the subwidgets of a given widget recursively.
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83 * Stop as soon as the function returns non NULL and returns this as a value.
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84 */
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85 void *
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86 XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg)
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87 {
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88 void* result;
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89 if (XtIsComposite (w))
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90 {
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91 CompositeWidget cw = (CompositeWidget)w;
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92 int i;
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93 for (i = 0; i < cw->composite.num_children; i++)
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94 if (XtIsWidget (cw->composite.children [i])){
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95 result = proc (cw->composite.children [i], arg);
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96 if (result)
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97 return result;
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98 result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
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99 arg);
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100 if (result)
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101 return result;
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102 }
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103 }
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104 return NULL;
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105 }
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106
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107
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108 /*
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109 * Returns a copy of the list of all children of a composite widget
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110 */
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111 Widget *
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112 XtCompositeChildren (Widget widget, unsigned int* number)
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113 {
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114 CompositeWidget cw = (CompositeWidget)widget;
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115 Widget* result;
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116 int n;
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117 int i;
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118
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119 if (!XtIsComposite (widget))
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120 {
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121 *number = 0;
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122 return NULL;
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123 }
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124 n = cw->composite.num_children;
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125 result = (Widget*)XtMalloc (n * sizeof (Widget));
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126 *number = n;
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127 for (i = 0; i < n; i++)
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128 result [i] = cw->composite.children [i];
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129 return result;
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130 }
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131
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132 Boolean
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133 XtWidgetBeingDestroyedP (Widget widget)
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134 {
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135 return widget->core.being_destroyed;
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136 }
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137
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138 void
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139 XtSafelyDestroyWidget (Widget widget)
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140 {
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141 #if 0
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142
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143 /* this requires IntrinsicI.h (actually, InitialI.h) */
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144
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145 XtAppContext app = XtWidgetToApplicationContext(widget);
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146
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147 if (app->dispatch_level == 0)
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148 {
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149 app->dispatch_level = 1;
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150 XtDestroyWidget (widget);
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151 /* generates an event so that the event loop will be called */
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152 XChangeProperty (XtDisplay (widget), XtWindow (widget),
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153 XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
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154 app->dispatch_level = 0;
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155 }
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156 else
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157 XtDestroyWidget (widget);
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158
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159 #else
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160 abort ();
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161 #endif
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162 }
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