sunzi-fabric
Version:
made by fabric@3.2.0
239 lines (208 loc) • 6.69 kB
JavaScript
(function () {
var unknown = 'unknown';
/* EVENT HANDLING */
function areHostMethods(object) {
var methodNames = Array.prototype.slice.call(arguments, 1),
t, i, len = methodNames.length;
for (i = 0; i < len; i++) {
t = typeof object[methodNames[i]];
if (!(/^(?:function|object|unknown)$/).test(t)) {
return false;
}
}
return true;
}
/** @ignore */
var getElement,
setElement,
getUniqueId = (function () {
var uid = 0;
return function (element) {
return element.__uniqueID || (element.__uniqueID = 'uniqueID__' + uid++);
};
})();
(function () {
var elements = { };
/** @ignore */
getElement = function (uid) {
return elements[uid];
};
/** @ignore */
setElement = function (uid, element) {
elements[uid] = element;
};
})();
function createListener(uid, handler) {
return {
handler: handler,
wrappedHandler: createWrappedHandler(uid, handler)
};
}
function createWrappedHandler(uid, handler) {
return function (e) {
handler.call(getElement(uid), e || fabric.window.event);
};
}
function createDispatcher(uid, eventName) {
return function (e) {
if (handlers[uid] && handlers[uid][eventName]) {
var handlersForEvent = handlers[uid][eventName];
for (var i = 0, len = handlersForEvent.length; i < len; i++) {
handlersForEvent[i].call(this, e || fabric.window.event);
}
}
};
}
var shouldUseAddListenerRemoveListener = (
areHostMethods(fabric.document.documentElement, 'addEventListener', 'removeEventListener') &&
areHostMethods(fabric.window, 'addEventListener', 'removeEventListener')),
shouldUseAttachEventDetachEvent = (
areHostMethods(fabric.document.documentElement, 'attachEvent', 'detachEvent') &&
areHostMethods(fabric.window, 'attachEvent', 'detachEvent')),
// IE branch
listeners = { },
// DOM L0 branch
handlers = { },
addListener, removeListener;
if (shouldUseAddListenerRemoveListener) {
/** @ignore */
addListener = function (element, eventName, handler, options) {
// since ie10 or ie9 can use addEventListener but they do not support options, i need to check
element && element.addEventListener(eventName, handler, shouldUseAttachEventDetachEvent ? false : options);
};
/** @ignore */
removeListener = function (element, eventName, handler, options) {
element && element.removeEventListener(eventName, handler, shouldUseAttachEventDetachEvent ? false : options);
};
}
else if (shouldUseAttachEventDetachEvent) {
/** @ignore */
addListener = function (element, eventName, handler) {
if (!element) {
return;
}
var uid = getUniqueId(element);
setElement(uid, element);
if (!listeners[uid]) {
listeners[uid] = { };
}
if (!listeners[uid][eventName]) {
listeners[uid][eventName] = [];
}
var listener = createListener(uid, handler);
listeners[uid][eventName].push(listener);
element.attachEvent('on' + eventName, listener.wrappedHandler);
};
/** @ignore */
removeListener = function (element, eventName, handler) {
if (!element) {
return;
}
var uid = getUniqueId(element), listener;
if (listeners[uid] && listeners[uid][eventName]) {
for (var i = 0, len = listeners[uid][eventName].length; i < len; i++) {
listener = listeners[uid][eventName][i];
if (listener && listener.handler === handler) {
element.detachEvent('on' + eventName, listener.wrappedHandler);
listeners[uid][eventName][i] = null;
}
}
}
};
}
else {
/** @ignore */
addListener = function (element, eventName, handler) {
if (!element) {
return;
}
var uid = getUniqueId(element);
if (!handlers[uid]) {
handlers[uid] = { };
}
if (!handlers[uid][eventName]) {
handlers[uid][eventName] = [];
var existingHandler = element['on' + eventName];
if (existingHandler) {
handlers[uid][eventName].push(existingHandler);
}
element['on' + eventName] = createDispatcher(uid, eventName);
}
handlers[uid][eventName].push(handler);
};
/** @ignore */
removeListener = function (element, eventName, handler) {
if (!element) {
return;
}
var uid = getUniqueId(element);
if (handlers[uid] && handlers[uid][eventName]) {
var handlersForEvent = handlers[uid][eventName];
for (var i = 0, len = handlersForEvent.length; i < len; i++) {
if (handlersForEvent[i] === handler) {
handlersForEvent.splice(i, 1);
}
}
}
};
}
/**
* Adds an event listener to an element
* @function
* @memberOf fabric.util
* @param {HTMLElement} element
* @param {String} eventName
* @param {Function} handler
*/
fabric.util.addListener = addListener;
/**
* Removes an event listener from an element
* @function
* @memberOf fabric.util
* @param {HTMLElement} element
* @param {String} eventName
* @param {Function} handler
*/
fabric.util.removeListener = removeListener;
/**
* Cross-browser wrapper for getting event's coordinates
* @memberOf fabric.util
* @param {Event} event Event object
*/
function getPointer(event) {
event || (event = fabric.window.event);
var element = event.target ||
(typeof event.srcElement !== unknown ? event.srcElement : null),
scroll = fabric.util.getScrollLeftTop(element);
return {
x: pointerX(event) + scroll.left,
y: pointerY(event) + scroll.top
};
}
var pointerX = function(event) {
return event.clientX;
},
pointerY = function(event) {
return event.clientY;
};
function _getPointer(event, pageProp, clientProp) {
var touchProp = event.type === 'touchend' ? 'changedTouches' : 'touches';
var pointer, eventTouchProp = event[touchProp];
if (eventTouchProp && eventTouchProp[0]) {
pointer = eventTouchProp[0][clientProp];
}
if (typeof pointer === 'undefined') {
pointer = event[clientProp];
}
return pointer;
}
if (fabric.isTouchSupported) {
pointerX = function(event) {
return _getPointer(event, 'pageX', 'clientX');
};
pointerY = function(event) {
return _getPointer(event, 'pageY', 'clientY');
};
}
fabric.util.getPointer = getPointer;
})();