| 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 | } |