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Android: Multi-touch handling in rotate gesture.

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This commit is contained in:
vakrilov
2015-11-18 18:58:59 +02:00
parent 13907fdd84
commit e0681bcc40
1 changed files with 47 additions and 22 deletions
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69
ui/gestures/gestures.android.ts
View File

@ -443,52 +443,77 @@ class PanGestureListener extends android.view.GestureDetector.SimpleOnGestureLis
class RotateGestureDetector {
private observer: GesturesObserver;
private target: view.View;
private ptrID1: number;
private ptrID2: number;
private trackedPtrId1: number;
private trackedPtrId2: number;
private initalPointersAngle: number;
private angle: number;
private get isTracking(): boolean {
return this.trackedPtrId1 !== INVALID_POINTER_ID && this.trackedPtrId2 !== INVALID_POINTER_ID;
}
constructor(observer: GesturesObserver, target: view.View) {
this.observer = observer;
this.target = target;
this.ptrID1 = INVALID_POINTER_ID;
this.ptrID2 = INVALID_POINTER_ID;
this.trackedPtrId1 = INVALID_POINTER_ID;
this.trackedPtrId2 = INVALID_POINTER_ID;
}
public onTouchEvent(event: android.view.MotionEvent) {
let pointerID = event.getPointerId(event.getActionIndex());
let wasTracking = this.isTracking;
switch (event.getActionMasked()) {
case android.view.MotionEvent.ACTION_DOWN:
this.ptrID1 = event.getPointerId(event.getActionIndex());
break;
case android.view.MotionEvent.ACTION_POINTER_DOWN:
this.ptrID2 = event.getPointerId(event.getActionIndex());
this.initalPointersAngle = this.getPointersAngle(event);
let assigned = false;
if (this.trackedPtrId1 === INVALID_POINTER_ID && pointerID !== this.trackedPtrId2) {
this.trackedPtrId1 = pointerID;
assigned = true;
}
else if (this.trackedPtrId2 === INVALID_POINTER_ID && pointerID !== this.trackedPtrId1) {
this.trackedPtrId2 = pointerID;
assigned = true;
}
this.executeCallback(event, common.GestureStateTypes.began);
if (assigned && this.isTracking) {
// We have started tracking 2 pointers
this.angle = 0;
this.initalPointersAngle = this.getPointersAngle(event);
this.executeCallback(event, common.GestureStateTypes.began);
}
break;
case android.view.MotionEvent.ACTION_MOVE:
if (this.ptrID1 !== INVALID_POINTER_ID && this.ptrID2 !== INVALID_POINTER_ID) {
if (this.isTracking) {
this.updateAngle(event);
this.executeCallback(event, common.GestureStateTypes.changed);
}
break;
case android.view.MotionEvent.ACTION_UP:
this.ptrID1 = INVALID_POINTER_ID;
break;
case android.view.MotionEvent.ACTION_POINTER_UP:
this.ptrID2 = INVALID_POINTER_ID;
if (pointerID === this.trackedPtrId1) {
this.trackedPtrId1 = INVALID_POINTER_ID;
}
else if (pointerID === this.trackedPtrId2) {
this.trackedPtrId2 = INVALID_POINTER_ID;
}
this.executeCallback(event, common.GestureStateTypes.ended);
if (wasTracking && !this.isTracking) {
this.executeCallback(event, common.GestureStateTypes.ended);
}
break;
case android.view.MotionEvent.ACTION_CANCEL:
this.ptrID1 = INVALID_POINTER_ID;
this.ptrID2 = INVALID_POINTER_ID;
this.executeCallback(event, common.GestureStateTypes.cancelled);
case android.view.MotionEvent.ACTION_CANCEL:
this.trackedPtrId1 = INVALID_POINTER_ID;
this.trackedPtrId2 = INVALID_POINTER_ID;
if (wasTracking) {
this.executeCallback(event, common.GestureStateTypes.cancelled);
}
break;
}
return true;
@ -524,10 +549,10 @@ class RotateGestureDetector {
}
private getPointersAngle(event: android.view.MotionEvent) {
let firstX = event.getX(event.findPointerIndex(this.ptrID1));
let firstY = event.getY(event.findPointerIndex(this.ptrID1));
let secondX = event.getX(event.findPointerIndex(this.ptrID2));
let secondY = event.getY(event.findPointerIndex(this.ptrID2));
let firstX = event.getX(event.findPointerIndex(this.trackedPtrId1));
let firstY = event.getY(event.findPointerIndex(this.trackedPtrId1));
let secondX = event.getX(event.findPointerIndex(this.trackedPtrId2));
let secondY = event.getY(event.findPointerIndex(this.trackedPtrId2));
return Math.atan2((secondY - firstY), (secondX - firstX));
}