--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mouse.c	Thu Dec 18 22:37:15 2008 +0800
@@ -0,0 +1,104 @@
+#include "mb_types.h"
+#include "mb_redraw_man.h"
+
+#define ASSERT(x)
+
+static void mouse_event_interpreter(event_t *evt, void *arg) {
+    mouse_event_t *mevt = (mouse_event_t *)evt;
+    redraw_man_t *rdman = (redraw_man_t *)arg;
+    mb_obj_t *obj;
+    mouse_event_t new_evt;
+    coord_t *coord;
+    shape_t *shape;
+    
+    ASSERT(evt->type == EVT_MOUSE_MOVE_RAW);
+    
+    obj = (mb_obj_t *)subject_get_object(evt->cur_tgt);
+    if(rdman->last_mouse_over == obj) {
+	evt->type = EVT_MOUSE_MOVE;
+	return;
+    }
+    
+    new_evt.x = mevt->x;
+    new_evt.y = mevt->y;
+    new_evt.but_state = mevt->but_state;
+    new_evt.button = mevt->button;
+    
+    if(rdman->last_mouse_over != NULL) {
+	new_evt.event.type = EVT_MOUSE_OUT;
+	if(IS_MBO_COORD(rdman->last_mouse_over)) {
+	    coord = (coord_t *)rdman->last_mouse_over;
+	    subject_notify(coord->mouse_event, (event_t *)&new_evt);
+	} else if(IS_MBO_SHAPES(rdman->last_mouse_over)) {
+	    shape = (shape_t *)rdman->last_mouse_over;
+	    ASSERT(shape->geo != NULL);
+	    subject_notify(shape->geo->mouse_event, (event_t *)&new_evt); 
+	}
+    }
+
+    new_evt.event.type = EVT_MOUSE_OVER;
+    subject_notify(evt->cur_tgt, (event_t *)&new_evt);
+    rdman->last_mouse_over = obj;
+    
+    evt->flags |= EVTF_STOP_NOTIFY;
+}
+
+/*! \brief This is event handler that observes addrm_monitor subject.
+ *
+ * addrm_monitor subject is a member of redraw manager objects.
+ * Monitor of mouse event subjects of mb_obj_t objects are set to this
+ * subject by redraw manager.
+ *
+ * addrm_monitor_hdlr() monitor adding and removing observers of mouse
+ * event subjects, and install special observers to these subjects to handle
+ * and interpret mouse events (EVT_MOUSE_MOVE_RAW).
+ */
+void addrm_monitor_hdlr(event_t *evt, void *arg) {
+    monitor_event_t *mevt;
+    redraw_man_t *rdman;
+    mb_obj_t *obj;
+    mb_prop_store_t *props;
+    observer_t *observer;
+    int cnt = 0;
+    
+    mevt = (monitor_event_t *)evt;
+    rdman = (redraw_man_t *)evt->tgt;
+    obj = (mb_obj_t *)subject_get_object(mevt->subject);
+    props = mb_obj_prop_store(obj);
+
+    switch(evt->type) {
+    case EVT_MONITOR_ADD:
+	if(!mb_prop_has(props, PROP_MEVT_OB_CNT))
+	    cnt = 0;
+	else
+	    cnt = (int)mb_prop_get(props, PROP_MEVT_OB_CNT);
+	
+	cnt++;
+	mb_prop_set(props, PROP_MEVT_OB_CNT, (void *)cnt);
+	if(cnt == 1) {
+	    observer =
+		subject_add_event_observer_head(mevt->subject,
+						EVT_MOUSE_MOVE_RAW,
+						mouse_event_interpreter,
+						rdman);
+	    ASSERT(observer != NULL);
+	    mb_prop_set(props, PROP_MEVT_OBSERVER, observer);
+	}
+	break;
+	
+    case EVT_MONITOR_REMOVE:
+	cnt = (int)mb_prop_get(props, PROP_MEVT_OB_CNT);
+	cnt--;
+	mb_prop_set(props, PROP_MEVT_OB_CNT, (void *)cnt);
+	if(cnt == 1) {
+	    observer = (observer_t *)mb_prop_get(props, PROP_MEVT_OBSERVER);
+	    subject_remove_observer(mevt->subject, observer);
+	    mb_prop_del(props, PROP_MEVT_OBSERVER);
+	}
+	break;
+	
+    case EVT_MONITOR_FREE:
+	break;
+    }
+}
+