问题描述
我正在寻找一种重新安排View
的孩子的方法。
<GridLayout id="parent">
<AbsoluteLayout width="50" height="50" id="a"></AbsoluteLayout>
<AbsoluteLayout width="50" height="50" id="b"></AbsoluteLayout>
</GridLayout>
假设我想重新排列a
和b
(以便它们以不同的顺序捕获事件)。我该怎么办?
解决方法
主要思想是执行以下操作:
container.removeChild(child)
container.insertChild(child,indexWhereToInsert)
这可能与用户手势混淆(因为在我的情况下,我想将要拖动的AbsoluteView
放在最前面),因此您可以重新排列所有其他孩子们。
就我而言,我将其扩展为完整的组件:
import {AfterViewInit,Component,ElementRef} from '@angular/core';
import {ProxyViewContainer,View} from 'tns-core-modules/ui';
@Component({
selector: 'app-reorderer',template: '<ng-content></ng-content>',})
export class ReorderComponent implements AfterViewInit {
private childViews: View[] = []
private container: ProxyViewContainer
constructor(el: ElementRef) {
this.container = (<ProxyViewContainer>el.nativeElement);
}
ngAfterViewInit(): void {
this.container.eachChildView(cv => {
this.childViews.push(cv)
return true
})
}
// Call this from outside and pass the view you want to focus
focus(view: View) {
for (const v of this.childViews.reverse()) {
if (v == view) continue
this.container.removeChild(v)
this.container.insertChild(v,0)
}
this.childViews = []
this.container.eachChildView(cv => {
this.childViews.push(cv)
return true
})
}
}
然后像这样使用它:
<app-reorderer>
<AbsoluteLayout width="50" height="50" id="a"></AbsoluteLayout>
<AbsoluteLayout width="50" height="50" id="b"></AbsoluteLayout>
</app-reorderer>