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57 lines
1.7 KiB
57 lines
1.7 KiB
var trigger = require('./trigger');
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var root = require('./root');
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var hasTouchSupport = 'ontouchstart' in root;
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exports = function() {
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var el =
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arguments.length > 0 && arguments[0] !== undefined
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? arguments[0]
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: document;
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if (hasTouchSupport) return;
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if (el._isEmulated) return;
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el._isEmulated = true;
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el.addEventListener('mousedown', onMouse('touchstart'), true);
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el.addEventListener('mousemove', onMouse('touchmove'), true);
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el.addEventListener('mouseup', onMouse('touchend'), true);
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};
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function onMouse(type) {
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return function(e) {
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if (e.which !== 1) return;
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trigger(e.target, type, {
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altKey: e.altKey,
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ctrlKey: e.ctrlKey,
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metaKey: e.metaKey,
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shiftKey: e.shiftKey,
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touches: getActiveTouches(e),
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targetTouches: getActiveTouches(e),
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changedTouches: createTouchList(e)
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});
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};
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}
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function getActiveTouches(e) {
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if (e.type == 'mouseup') return createTouchList();
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return createTouchList(e);
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}
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function Touch(target, identifier, pos, deltaX, deltaY) {
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deltaX = deltaX || 0;
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deltaY = deltaY || 0;
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this.identifier = identifier;
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this.target = target;
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this.clientX = pos.clientX + deltaX;
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this.clientY = pos.clientY + deltaY;
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this.screenX = pos.screenX + deltaX;
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this.screenY = pos.screenY + deltaY;
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this.pageX = pos.pageX + deltaX;
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this.pageY = pos.pageY + deltaY;
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}
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function createTouchList(e) {
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var touchList = [];
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touchList.item = function(index) {
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return this[index] || null;
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};
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if (e) {
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touchList.push(new Touch(e.target, 1, e, 0, 0));
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}
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return touchList;
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}
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module.exports = exports;
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