bd028579
 易尊强
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/**
* Only implements needed gestures for mobile.
*/
import * as eventUtil from './event';
import { ZRRawTouchEvent, ZRPinchEvent, Dictionary } from './types';
import Displayable from '../graphic/Displayable';
interface TrackItem {
points: number[][]
touches: Touch[]
target: Displayable,
event: ZRRawTouchEvent
}
export class GestureMgr {
private _track: TrackItem[] = []
constructor() {}
recognize(event: ZRRawTouchEvent, target: Displayable, root: HTMLElement) {
this._doTrack(event, target, root);
return this._recognize(event);
}
clear() {
this._track.length = 0;
return this;
}
_doTrack(event: ZRRawTouchEvent, target: Displayable, root: HTMLElement) {
const touches = event.touches;
if (!touches) {
return;
}
const trackItem: TrackItem = {
points: [],
touches: [],
target: target,
event: event
};
for (let i = 0, len = touches.length; i < len; i++) {
const touch = touches[i];
const pos = eventUtil.clientToLocal(root, touch, {});
trackItem.points.push([pos.zrX, pos.zrY]);
trackItem.touches.push(touch);
}
this._track.push(trackItem);
}
_recognize(event: ZRRawTouchEvent) {
for (let eventName in recognizers) {
if (recognizers.hasOwnProperty(eventName)) {
const gestureInfo = recognizers[eventName](this._track, event);
if (gestureInfo) {
return gestureInfo;
}
}
}
}
}
function dist(pointPair: number[][]): number {
const dx = pointPair[1][0] - pointPair[0][0];
const dy = pointPair[1][1] - pointPair[0][1];
return Math.sqrt(dx * dx + dy * dy);
}
function center(pointPair: number[][]): number[] {
return [
(pointPair[0][0] + pointPair[1][0]) / 2,
(pointPair[0][1] + pointPair[1][1]) / 2
];
}
type Recognizer = (tracks: TrackItem[], event: ZRRawTouchEvent) => {
type: string
target: Displayable
event: ZRRawTouchEvent
}
const recognizers: Dictionary<Recognizer> = {
pinch: function (tracks: TrackItem[], event: ZRRawTouchEvent) {
const trackLen = tracks.length;
if (!trackLen) {
return;
}
const pinchEnd = (tracks[trackLen - 1] || {}).points;
const pinchPre = (tracks[trackLen - 2] || {}).points || pinchEnd;
if (pinchPre
&& pinchPre.length > 1
&& pinchEnd
&& pinchEnd.length > 1
) {
let pinchScale = dist(pinchEnd) / dist(pinchPre);
!isFinite(pinchScale) && (pinchScale = 1);
(event as ZRPinchEvent).pinchScale = pinchScale;
const pinchCenter = center(pinchEnd);
(event as ZRPinchEvent).pinchX = pinchCenter[0];
(event as ZRPinchEvent).pinchY = pinchCenter[1];
return {
type: 'pinch',
target: tracks[0].target,
event: event
};
}
}
// Only pinch currently.
};
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