Forcing an event stream to finish

[Bennit]

In the example below I draw a line on a canvas element, however, after the line is drawn, the event stream for mousemove still fires events. Is there a way to force event streams to stop receiving events?

Kind regards

Ben

----

    // mode -- Line

    function modeLine(startX,startY) {

        

        function drawLine(x1,y1,x2,y2) {

            context.beginPath();

            context.moveTo(x1,y1);

            context.lineTo(x2,y2);

            context.stroke();

            context.closePath();

        }

    

        var lineE = receiverE(); // once a line event will be fired

        var started = true; // the drawing of this line operation has started

        var pointA = new Point(startX,startY); // the starting point

        var pointB = pointA; // the current ending point

        

        jQCanvas.fj('extEvtE','mousemove').mapE(function(mm){

           if(started) {

               redraw();

               drawLine(startX,startY,mm.layerX,mm.layerY);

           }

           else { console.log('mouse move event after stop');}

        });

        

        jQCanvas.fj('extEvtE','mouseup').onceE().mapE(function(mu){

           started = false;

           lineE.sendEvent(new Line(mu.layerX,mu.layerY));

        });

        

        return lineE;

    }

[Jay Shepherd]

Hi Ben.  Checkout filterE,  ill give you a better example when im on a pc :-)

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[Alexander Yuryev]

Do you mean .filterE(function(v){return started}) in this example? I don't understand how filterE will deal with events which continue to evaluate, but never used. I think it's a leak. (I have the same question at http://stackoverflow.com/questions/19513953/how-to-deal-with-flapjax-eventstreams-which-becomes-unused)

среда, 1 августа 2012 г., 2:08:30 UTC+4 пользователь Jay Shepherd написал: