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Limit mouse events to Pixi.js Container

I’m using Pixi JS and detecting the mouse position via a simple event handler:

...

var stage = new PIXI.Container();
stage.interactive = true;

var handler = function(e){
  mouseX = renderer.plugins.interaction.mouse.global.x;
  mouseY = renderer.plugins.interaction.mouse.global.y;
}

stage.on("pointermove", handler);

...

However mouseX and mouseY are being updated when the mouse is outside of the stage bounds (the <canvas> element on the page). Is it possible to limit the mousemove event to within the stage?

I’ve tried stage.hitArea but that didn’t work.

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Answer

This seems to be the intended behavior; calling the mousemove callback even when the mouse pointer is outside of the container is necessary for implementing certain things, for example drag&drop.

But you can keep track of whether the pointer is above the object using mouseover and mouseout events like this:

...
var graphics = new PIXI.Graphics();
graphics.hitArea = new PIXI.Rectangle(0, 0, 100, 100);
graphics.interactive = true;
stage.addChild(graphics);
...

var mouseIn = false;
graphics.on("mouseover", function(e) {
  console.log("over")
  mouseIn = true;
});

graphics.on("mouseout", function(e) {
  console.log("out");
  mouseIn = false;
});

graphics.on("mousemove",function(e) {
  if (mouseIn) {
    console.log("mouse move inside", e)
  }
});

(NOTE: I couldn’t get mouseout and mouseover events firing on the stage object – but apparently you should only add child elements to the stage and interact with them. Also, the hitArea is necessary.)

This JSFiddle should demonstrate this idea, see the console output: http://jsfiddle.net/qc73ufbh/

It really seems to be feature rather than a bug, checkout these closed issues on this topic: https://github.com/pixijs/pixi.js/issues/2310 and https://github.com/pixijs/pixi.js/issues/1250

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