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perf(item): improves performance of sliding item #9005

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merged 1 commit into from
Nov 4, 2016
Merged

perf(item): improves performance of sliding item #9005

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3 changes: 3 additions & 0 deletions src/components/item/item-sliding-gesture.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import { List } from '../list/list';
import { GesturePriority } from '../../gestures/gesture-controller';
import { PanGesture } from '../../gestures/drag-gesture';
import { pointerCoord } from '../../util/dom';
import { NativeRafDebouncer } from '../../util/debouncer';

const DRAG_THRESHOLD = 10;
const MAX_ATTACK_ANGLE = 20;
Expand All @@ -19,6 +20,8 @@ export class ItemSlidingGesture extends PanGesture {
super(list.getNativeElement(), {
maxAngle: MAX_ATTACK_ANGLE,
threshold: DRAG_THRESHOLD,
zone: false,
debouncer: new NativeRafDebouncer(),
gesture: list._gestureCtrl.create('item-sliding', {
priority: GesturePriority.SlidingItem,
})
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5 changes: 4 additions & 1 deletion src/components/item/item-sliding.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -402,7 +402,10 @@ export class ItemSliding {
}

this.item.setElementStyle(CSS.transform, `translate3d(${-openAmount}px,0,0)`);
this._zone.run(() => this.ionDrag.emit(this));
let ionDrag = this.ionDrag;
if (ionDrag.observers.length > 0) {
this._zone.run(ionDrag.emit.bind(ionDrag, this));
}
}

private _setState(state: SlidingState) {
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