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428
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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 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 #include <config.h>
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22 #include <stdlib.h>
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23 #include <string.h>
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24 #include <memory.h>
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25 #ifdef HAVE_UNISTD_H
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26 #include <unistd.h>
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27 #endif
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28
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29 #include <X11/Xatom.h>
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30 #include <X11/IntrinsicP.h>
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31 #include <X11/ObjectP.h>
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32 #include "lwlib-utils.h"
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33
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34 void
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35 destroy_all_children (Widget widget)
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36 {
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37 Widget* children;
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38 unsigned int number;
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39 int i;
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40
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41 children = XtCompositeChildren (widget, &number);
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42 if (children)
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43 {
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44 /* Unmanage all children and destroy them. They will only be
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45 * really destroyed when we get out of DispatchEvent. */
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487
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46 for (i = 0; i < (int) number; i++)
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428
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47 {
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48 Widget child = children [i];
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49 if (!child->core.being_destroyed)
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50 {
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51 XtUnmanageChild (child);
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52 XtDestroyWidget (child);
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53 }
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54 }
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55 XtFree ((char *) children);
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56 }
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57 }
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58
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59 /* Redisplay the contents of the widget, without first clearing it. */
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60 void
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61 XtNoClearRefreshWidget (Widget widget)
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62 {
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63 XEvent event;
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64 XExposeEvent* ev = &event.xexpose;
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65
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66 ev->type = Expose;
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67 ev->serial = 0;
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68 ev->send_event = 0;
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69 ev->display = XtDisplay (widget);
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70 ev->window = XtWindow (widget);
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71 ev->x = 0;
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72 ev->y = 0;
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73 ev->width = widget->core.width;
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74 ev->height = widget->core.height;
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75 ev->count = 0;
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76
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77 (*widget->core.widget_class->core_class.expose)
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78 (widget, &event, (Region)NULL);
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79 }
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80
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81
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82 /*
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83 * Apply a function to all the subwidgets of a given widget recursively.
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84 */
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85 void
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86 XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg)
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87 {
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88 if (XtIsComposite (w))
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89 {
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90 CompositeWidget cw = (CompositeWidget) w;
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91 /* We have to copy the children list before mapping over it, because
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92 the procedure might add/delete elements, which would lose badly. */
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93 int nkids = cw->composite.num_children;
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94 Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids);
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95 int i;
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96 memcpy (kids, cw->composite.children, sizeof (Widget) * nkids);
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97 for (i = 0; i < nkids; i++)
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98 /* This prevent us from using gadgets, why is it here? */
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99 /* if (XtIsWidget (kids [i])) */
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100 {
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101 /* do the kiddies first in case we're destroying */
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102 XtApplyToWidgets (kids [i], proc, arg);
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103 proc (kids [i], arg);
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104 }
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105 free (kids);
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106 }
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107 }
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108
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109
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110 /*
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111 * Apply a function to all the subwidgets of a given widget recursively.
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112 * Stop as soon as the function returns non NULL and returns this as a value.
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113 */
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114 void *
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115 XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg)
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116 {
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117 void* result;
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118 if (XtIsComposite (w))
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119 {
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120 CompositeWidget cw = (CompositeWidget)w;
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121 int i;
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122 for (i = 0; i < cw->composite.num_children; i++)
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123 if (XtIsWidget (cw->composite.children [i])){
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124 result = proc (cw->composite.children [i], arg);
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125 if (result)
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126 return result;
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127 result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
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128 arg);
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129 if (result)
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130 return result;
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131 }
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132 }
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133 return NULL;
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134 }
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135
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136
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137 /*
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138 * Returns a copy of the list of all children of a composite widget
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139 */
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140 Widget *
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141 XtCompositeChildren (Widget widget, unsigned int* number)
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142 {
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143 CompositeWidget cw = (CompositeWidget)widget;
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144 Widget* result;
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145 int n;
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146 int i;
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147
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148 if (!XtIsComposite (widget))
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149 {
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150 *number = 0;
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151 return NULL;
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152 }
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153 n = cw->composite.num_children;
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154 result = (Widget*)XtMalloc (n * sizeof (Widget));
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155 *number = n;
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156 for (i = 0; i < n; i++)
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157 result [i] = cw->composite.children [i];
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158 return result;
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159 }
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160
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161 Boolean
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162 XtWidgetBeingDestroyedP (Widget widget)
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163 {
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164 return widget->core.being_destroyed;
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165 }
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166
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167 void
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168 XtSafelyDestroyWidget (Widget widget)
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169 {
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170 #if 0
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171
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172 /* this requires IntrinsicI.h (actually, InitialI.h) */
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173
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174 XtAppContext app = XtWidgetToApplicationContext(widget);
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175
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176 if (app->dispatch_level == 0)
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177 {
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178 app->dispatch_level = 1;
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179 XtDestroyWidget (widget);
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180 /* generates an event so that the event loop will be called */
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181 XChangeProperty (XtDisplay (widget), XtWindow (widget),
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182 XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
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183 app->dispatch_level = 0;
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184 }
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185 else
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186 XtDestroyWidget (widget);
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187
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188 #else
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189 abort ();
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190 #endif
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191 }
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