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return a function to disabled TouchEmulator #21

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return a function to disabled TouchEmulator #21

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46 changes: 42 additions & 4 deletions touch-emulator.js
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Original file line number Diff line number Diff line change
Expand Up @@ -85,18 +85,34 @@
/**
* Simple trick to fake touch event support
* this is enough for most libraries like Modernizr and Hammer
* @returns {Function}
*/
function fakeTouchSupport() {
var objs = [window, document.documentElement];
var props = ['ontouchstart', 'ontouchmove', 'ontouchcancel', 'ontouchend'];
var replaced = [];

for(var o=0; o<objs.length; o++) {
for(var p=0; p<props.length; p++) {
if(objs[o] && objs[o][props[p]] == undefined) {
replaced.push([o, p, props[p] in objs[o], objs[o][props[p]]]);
objs[o][props[p]] = null;
}
}
}

return function unfakeTouchSupport() {
if(replaced) {
for(var i=0; i<replaced.length; i++) {
if(replaced[i][2]) {
objs[replaced[i][0]][props[replaced[i][1]]] = replaced[i][3];
} else {
delete objs[replaced[i][0]][props[replaced[i][1]]];
}
}
replaced = undefined;
}
};
}

/**
Expand Down Expand Up @@ -289,17 +305,21 @@

/**
* TouchEmulator initializer
* @returns {Function}
*/
function TouchEmulator() {
if (hasTouchSupport()) {
return;
}

fakeTouchSupport();
var unfakeTouchSupport = fakeTouchSupport();
var mouseDownHandler = onMouse('touchstart');
var mouseMoveHandler = onMouse('touchmove');
var mouseUpHandler = onMouse('touchend');

window.addEventListener("mousedown", onMouse('touchstart'), true);
window.addEventListener("mousemove", onMouse('touchmove'), true);
window.addEventListener("mouseup", onMouse('touchend'), true);
window.addEventListener("mousedown", mouseDownHandler, true);
window.addEventListener("mousemove", mouseMoveHandler, true);
window.addEventListener("mouseup", mouseUpHandler, true);

window.addEventListener("mouseenter", preventMouseEvents, true);
window.addEventListener("mouseleave", preventMouseEvents, true);
Expand All @@ -311,6 +331,24 @@
window.addEventListener("touchmove", showTouches, true);
window.addEventListener("touchend", showTouches, true);
window.addEventListener("touchcancel", showTouches, true);

return function disableTouchEmulator() {
window.removeEventListener("mousedown", mouseDownHandler, true);
window.removeEventListener("mousemove", mouseMoveHandler, true);
window.removeEventListener("mouseup", mouseUpHandler, true);

window.removeEventListener("mouseenter", preventMouseEvents, true);
window.removeEventListener("mouseleave", preventMouseEvents, true);
window.removeEventListener("mouseout", preventMouseEvents, true);
window.removeEventListener("mouseover", preventMouseEvents, true);

// it uses itself!
window.removeEventListener("touchstart", showTouches, true);
window.removeEventListener("touchmove", showTouches, true);
window.removeEventListener("touchend", showTouches, true);
window.removeEventListener("touchcancel", showTouches, true);
unfakeTouchSupport();
};
}

// start distance when entering the multitouch mode
Expand Down