00001 #ifndef EVENT_H
00002 #define EVENT_H
00003
00004 /*
00005 * The visual system is an event-driven environment. An "event" object
00006 * contains the current event context - the event kind, the vnode object,
00007 * the source widget.
00008 *
00009 * There is a global event binding list. Whenever an event occurs,
00010 * event bindings in this global list are invoked. The "add_event_binding"
00011 * function adds a binding to this list; the "remove_event_binding" removes
00012 * a binding from the list. The "post_event" method posts a global event,
00013 * and invokes the corresponding event bindings;
00014 */
00015
00016 //#include <sty.h>
00017
00018 enum event_kind {
00019 NULL_EVENT = 0,
00020
00021 VNODE_CREATE = 1024,
00022 VNODE_DESTROY,
00023
00024 WINDOW_CREATE = 2048,
00025 WINDOW_CLOSE,
00026 PROP_CREATE, // New property
00027 PROP_CHANGE, // Property changed
00028 PROP_DESTROY, // Property removed
00029
00030 SELECTION = 4096,
00031 INVOCATION,
00032 OK_BUTTON,
00033 CANCEL_BUTTON,
00034
00035 VISUAL_USER_EVENT = 8192
00036 };
00037
00038 /* event masks */
00039 #define ALL_EVENTS (-1L)
00040 #define VNODE_EVENTS 1024L
00041 #define VISUAL_EVENTS 2048L
00042 #define X_EVENTS 4096L
00043 #define VISUAL_USER_EVENTS (VISUAL_USER_EVENT)
00044
00045
00046 class event {
00047 private:
00048 int e_kind;
00049 class vnode *vn;
00050 class vwidget *source_obj;
00051 void *event_param;
00052
00053 public:
00054 event() { e_kind = NULL_EVENT; }
00055 event(vnode *obj, int k, vwidget *source = 0, void *param = 0 ) {
00056 vn = obj;
00057 e_kind = k;
00058 source_obj = source;
00059 event_param = param;
00060 }
00061 ~event() {}
00062
00063 int kind(void) const { return e_kind; }
00064 vnode *get_object(void) const { return vn; }
00065 vwidget *get_source(void) const { return source_obj; }
00066 void *get_param(void) const { return event_param; }
00067 };
00068
00069
00070 void init_eman(void);
00071 void exit_eman(void);
00072 void post_event(const event &e);
00073 void add_event_binding(class binding *b, int event_mask);
00074 void remove_event_binding(binding *b);
00075 void set_event_mask(binding *b, int event_mask);
00076
00077 #endif
