import * as eventUtil from './event.js';
|
var GestureMgr = (function () {
|
function GestureMgr() {
|
this._track = [];
|
}
|
GestureMgr.prototype.recognize = function (event, target, root) {
|
this._doTrack(event, target, root);
|
return this._recognize(event);
|
};
|
GestureMgr.prototype.clear = function () {
|
this._track.length = 0;
|
return this;
|
};
|
GestureMgr.prototype._doTrack = function (event, target, root) {
|
var touches = event.touches;
|
if (!touches) {
|
return;
|
}
|
var trackItem = {
|
points: [],
|
touches: [],
|
target: target,
|
event: event
|
};
|
for (var i = 0, len = touches.length; i < len; i++) {
|
var touch = touches[i];
|
var pos = eventUtil.clientToLocal(root, touch, {});
|
trackItem.points.push([pos.zrX, pos.zrY]);
|
trackItem.touches.push(touch);
|
}
|
this._track.push(trackItem);
|
};
|
GestureMgr.prototype._recognize = function (event) {
|
for (var eventName in recognizers) {
|
if (recognizers.hasOwnProperty(eventName)) {
|
var gestureInfo = recognizers[eventName](this._track, event);
|
if (gestureInfo) {
|
return gestureInfo;
|
}
|
}
|
}
|
};
|
return GestureMgr;
|
}());
|
export { GestureMgr };
|
function dist(pointPair) {
|
var dx = pointPair[1][0] - pointPair[0][0];
|
var dy = pointPair[1][1] - pointPair[0][1];
|
return Math.sqrt(dx * dx + dy * dy);
|
}
|
function center(pointPair) {
|
return [
|
(pointPair[0][0] + pointPair[1][0]) / 2,
|
(pointPair[0][1] + pointPair[1][1]) / 2
|
];
|
}
|
var recognizers = {
|
pinch: function (tracks, event) {
|
var trackLen = tracks.length;
|
if (!trackLen) {
|
return;
|
}
|
var pinchEnd = (tracks[trackLen - 1] || {}).points;
|
var pinchPre = (tracks[trackLen - 2] || {}).points || pinchEnd;
|
if (pinchPre
|
&& pinchPre.length > 1
|
&& pinchEnd
|
&& pinchEnd.length > 1) {
|
var pinchScale = dist(pinchEnd) / dist(pinchPre);
|
!isFinite(pinchScale) && (pinchScale = 1);
|
event.pinchScale = pinchScale;
|
var pinchCenter = center(pinchEnd);
|
event.pinchX = pinchCenter[0];
|
event.pinchY = pinchCenter[1];
|
return {
|
type: 'pinch',
|
target: tracks[0].target,
|
event: event
|
};
|
}
|
}
|
};
|
