actionscript 3 - Can any one explain this code how i use this in my application -

i have problem similar this question i'm not able understand answer code, can 1 explain code.

private function attachlisteners():void {     this.addeventlistener(mouseevent.mouse_down, selfmousedownhandler, false,0,true);     this.addeventlistener(moveevent.move, selfmovehandler, false,0,true); }  private function selfmovehandler(event:moveevent):void {     redrawconnectedlinks(); }  private function selfmousedownhandler(event:mouseevent):void {     stage.addeventlistener(mouseevent.mouse_up, stagemouseuphandler, false,0,true);     stage.addeventlistener(mouseevent.mouse_move, stagemousemovehandler, false,0,true); }  private function stagemouseuphandler(event:mouseevent):void {     stage.removeeventlistener(mouseevent.mouse_up, stagemouseuphandler, false);     stage.removeeventlistener(mouseevent.mouse_move, stagemousemovehandler, false); }  private function stagemousemovehandler(event:mouseevent):void {     dispatchevent(new moveevent(moveevent.move)); } 

please suggest me how use in flex application.

this code tracking mouse movement flash's mouseevent.mouse_up, mouseevent.mouse_move , mouseevent.mouse_down. along events, code using custom event: moveevent.move.

any time, moveevent.move being dispatched, app redraw connectors. so, listener moveevent.move being added once , @ beginning.

also, track drag, code waits mouse_down , keep on dispatching moveevent.move each mouseevent.mouse_move until mouse_up event occurs.

now, let me associate above explanation lines of code:

private function attachlisteners():void {     /*wait mouse down event initiate mouse move , mouse tracking*/     this.addeventlistener(mouseevent.mouse_down, selfmousedownhandler, false,0,true);      /*always track moveevent.move , start redrawing connectors whenever it's dispatched*/     this.addeventlistener(moveevent.move, selfmovehandler, false,0,true); }  private function selfmovehandler(event:moveevent):void {     /*redraw connectors when custom event moveevent.move received*/     redrawconnectedlinks(); }  private function selfmousedownhandler(event:mouseevent):void {     /*wait mouse event on receiving mouse down*/     stage.addeventlistener(mouseevent.mouse_up, stagemouseuphandler, false,0,true);     /*track mouse movement once mouse down*/     stage.addeventlistener(mouseevent.mouse_move, stagemousemovehandler, false,0,true); }  private function stagemouseuphandler(event:mouseevent):void {     /*once mouse happens stop tracking mouse up... */     stage.removeeventlistener(mouseevent.mouse_up, stagemouseuphandler, false);     /*don't track mouse movement once mouse button gets released*/     stage.removeeventlistener(mouseevent.mouse_move, stagemousemovehandler, false); }  private function stagemousemovehandler(event:mouseevent):void {     /*dispatch moveevent.move when mouse moved.       if read above setup again, should dispatched on mouse moves       happening after mouse down , before mouse      */     dispatchevent(new moveevent(moveevent.move)); } 

hth.

explanation of custom events asked in comment op

custom events useful add custom message passing semantics. e.g. in case, mouse drag detected series of mouse events, , once events happen custom event dispatched notify connectors should redrawn. similarly, might have refresh button , clicking on might dispatch same event force redraw.