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07bf635f RS |
1 | /* Defines some widget utility functions. |
2 | Copyright (C) 1992 Lucid, Inc. | |
3 | ||
4 | This file is part of the Lucid Widget Library. | |
5 | ||
6 | The Lucid Widget Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | The Lucid Widget Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <stdlib.h> | |
21 | #include <unistd.h> | |
22 | #include <string.h> | |
23 | #include <memory.h> | |
24 | ||
25 | #include <X11/Xatom.h> | |
26 | #include <X11/IntrinsicP.h> | |
27 | #include <X11/ObjectP.h> | |
28 | #include "lwlib-utils.h" | |
29 | ||
30 | /* Redisplay the contents of the widget, without first clearing it. */ | |
31 | void | |
32 | XtNoClearRefreshWidget (Widget widget) | |
33 | { | |
34 | XEvent event; | |
35 | ||
36 | event.type = Expose; | |
37 | event.xexpose.serial = 0; | |
38 | event.xexpose.send_event = 0; | |
39 | event.xexpose.display = XtDisplay (widget); | |
40 | event.xexpose.window = XtWindow (widget); | |
41 | event.xexpose.x = 0; | |
42 | event.xexpose.y = 0; | |
43 | event.xexpose.width = widget->core.width; | |
44 | event.xexpose.height = widget->core.height; | |
45 | event.xexpose.count = 0; | |
46 | ||
47 | (*widget->core.widget_class->core_class.expose) | |
48 | (widget, &event, (Region)NULL); | |
49 | } | |
50 | ||
51 | ||
52 | /* | |
53 | * Apply a function to all the subwidgets of a given widget recursively. | |
54 | */ | |
55 | void | |
56 | XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg) | |
57 | { | |
58 | if (XtIsComposite (w)) | |
59 | { | |
60 | CompositeWidget cw = (CompositeWidget) w; | |
61 | /* We have to copy the children list before mapping over it, because | |
62 | the procedure might add/delete elements, which would lose badly. | |
63 | */ | |
64 | int nkids = cw->composite.num_children; | |
65 | Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids); | |
66 | int i; | |
67 | memcpy (kids, cw->composite.children, sizeof (Widget) * nkids); | |
68 | for (i = 0; i < nkids; i++) | |
69 | /* This prevent us from using gadgets, why is it here? */ | |
70 | /* if (XtIsWidget (kids [i])) */ | |
71 | { | |
72 | /* do the kiddies first in case we're destroying */ | |
73 | XtApplyToWidgets (kids [i], proc, arg); | |
74 | proc (kids [i], arg); | |
75 | } | |
76 | free (kids); | |
77 | } | |
78 | } | |
79 | ||
80 | ||
81 | /* | |
82 | * Apply a function to all the subwidgets of a given widget recursively. | |
83 | * Stop as soon as the function returns non NULL and returns this as a value. | |
84 | */ | |
85 | void * | |
86 | XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg) | |
87 | { | |
88 | void* result; | |
89 | if (XtIsComposite (w)) | |
90 | { | |
91 | CompositeWidget cw = (CompositeWidget)w; | |
92 | int i; | |
93 | for (i = 0; i < cw->composite.num_children; i++) | |
94 | if (XtIsWidget (cw->composite.children [i])){ | |
95 | result = proc (cw->composite.children [i], arg); | |
96 | if (result) | |
97 | return result; | |
98 | result = XtApplyUntilToWidgets (cw->composite.children [i], proc, | |
99 | arg); | |
100 | if (result) | |
101 | return result; | |
102 | } | |
103 | } | |
104 | return NULL; | |
105 | } | |
106 | ||
107 | ||
108 | /* | |
109 | * Returns a copy of the list of all children of a composite widget | |
110 | */ | |
111 | Widget * | |
112 | XtCompositeChildren (Widget widget, unsigned int* number) | |
113 | { | |
114 | CompositeWidget cw = (CompositeWidget)widget; | |
115 | Widget* result; | |
116 | int n; | |
117 | int i; | |
118 | ||
119 | if (!XtIsComposite (widget)) | |
120 | { | |
121 | *number = 0; | |
122 | return NULL; | |
123 | } | |
124 | n = cw->composite.num_children; | |
125 | result = (Widget*)XtMalloc (n * sizeof (Widget)); | |
126 | *number = n; | |
127 | for (i = 0; i < n; i++) | |
128 | result [i] = cw->composite.children [i]; | |
129 | return result; | |
130 | } | |
131 | ||
132 | Boolean | |
133 | XtWidgetBeingDestroyedP (Widget widget) | |
134 | { | |
135 | return widget->core.being_destroyed; | |
136 | } | |
137 | ||
138 | void | |
139 | XtSafelyDestroyWidget (Widget widget) | |
140 | { | |
141 | #if 0 | |
142 | ||
143 | /* this requires IntrinsicI.h (actually, InitialI.h) */ | |
144 | ||
145 | XtAppContext app = XtWidgetToApplicationContext(widget); | |
146 | ||
147 | if (app->dispatch_level == 0) | |
148 | { | |
149 | app->dispatch_level = 1; | |
150 | XtDestroyWidget (widget); | |
151 | /* generates an event so that the event loop will be called */ | |
152 | XChangeProperty (XtDisplay (widget), XtWindow (widget), | |
153 | XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0); | |
154 | app->dispatch_level = 0; | |
155 | } | |
156 | else | |
157 | XtDestroyWidget (widget); | |
158 | ||
159 | #else | |
160 | abort (); | |
161 | #endif | |
162 | } |