2 * Demo user widget for WINGs
4 * Author: Alfredo K. Kojima
6 * This file is in the public domain.
12 * Include the WINGs private data header.
16 #include <WINGs/WINGsP.h>
24 * Define the widget "class"
26 typedef struct W_MyWidget {
27 /* these two fields must be present in all your widgets in this
32 /* put your stuff here */
37 /* some forward declarations */
39 static void destroyMyWidget(_MyWidget * mPtr);
40 static void paintMyWidget(_MyWidget * mPtr);
42 static void handleEvents(XEvent * event, void *data);
43 static void handleActionEvents(XEvent * event, void *data);
47 * See the source for the other widgets to see how to use.
48 * You won't need to use this most of the time.
50 static W_ViewDelegate _MyWidgetDelegate = {
58 /* our widget class ID */
59 static W_Class myWidgetClass = 0;
62 * Initializer for our widget. Must be called before creating any
63 * instances of the widget.
65 W_Class InitMyWidget(WMScreen * scr)
67 /* register our widget with WINGs and get our widget class ID */
69 myWidgetClass = W_RegisterUserWidget();
76 * Our widget fabrication plant.
78 MyWidget *CreateMyWidget(WMWidget * parent)
82 /* allocate some storage for our new widget instance */
83 mPtr = wmalloc(sizeof(MyWidget));
85 memset(mPtr, 0, sizeof(MyWidget));
87 /* set the class ID */
88 mPtr->widgetClass = myWidgetClass;
91 * Create the view for our widget.
92 * Note: the Window for the view is only created after the view is
93 * realized with W_RealizeView()
95 * Consider the returned view as read-only.
97 mPtr->view = W_CreateView(W_VIEW(parent));
103 mPtr->view->self = mPtr;
105 /* setup the delegates for the view */
106 mPtr->view->delegate = &_MyWidgetDelegate;
109 * Intercept some events for our widget, so that we can handle them.
111 WMCreateEventHandler(mPtr->view, ExposureMask /* this allows us to know when we should paint */
112 | StructureNotifyMask, /* this allows us to know things like when we are destroyed */
116 * Intercept some other events. This could be merged with the above
117 * call, but we separate for more organization.
119 WMCreateEventHandler(mPtr->view, ButtonPressMask, handleActionEvents, mPtr);
125 * Paint our widget contents.
127 static void paintMyWidget(_MyWidget * mPtr)
129 W_Screen *scr = mPtr->view->screen;
134 color = WMWhiteColor(scr);
136 W_PaintText(mPtr->view, mPtr->view->window, scr->normalFont, 0, 0,
137 mPtr->view->size.width, WACenter, color, False, mPtr->text, strlen(mPtr->text));
139 WMReleaseColor(color);
143 static void handleEvents(XEvent * event, void *data)
145 _MyWidget *mPtr = (_MyWidget *) data;
147 switch (event->type) {
149 if (event->xexpose.count != 0)
155 destroyMyWidget(mPtr);
161 static void handleActionEvents(XEvent * event, void *data)
163 _MyWidget *mPtr = (_MyWidget *) data;
165 switch (event->type) {
167 XBell(mPtr->view->screen->display, 100);
168 XBell(mPtr->view->screen->display, 100);
173 void SetMyWidgetText(MyWidget * mPtr, char *text)
175 CHECK_CLASS(mPtr, myWidgetClass);
180 mPtr->text = wstrdup(text);
182 if (W_VIEW_MAPPED(mPtr->view)) {
187 static void destroyMyWidget(_MyWidget * mPtr)
190 * Free all data we allocated for our widget.