private void hookEvents() { HTMLDocument document = canvas.getOwnerDocument(); canvas.addEventListener("mousedown", this, true); document.addEventListener("mousedown", this, true); canvas.addEventListener("mouseup", this, true); document.addEventListener("mouseup", this, true); canvas.addEventListener("mousemove", this, true); document.addEventListener("mousemove", this, true); canvas.addEventListener("mousewheel", this, true); document.addEventListener("keydown", this, false); document.addEventListener("keyup", this, false); document.addEventListener("keypress", this, false); canvas.addEventListener("touchstart", this); canvas.addEventListener("touchmove", this); canvas.addEventListener("touchcancel", this); canvas.addEventListener("touchend", this); }