如何实现拖拽时列表项占位动画的效果

拖拽Grid时，列表项显示占位动画效果。实现步骤如下：

在Grid组件下设置属性editMode(true)，使Grid进入编辑模式。进入编辑模式后，可以拖拽Grid组件内部的GridItem。
在onItemDragStart回调中设置拖拽时显示的组件。
在onItemDrop中获取拖拽起始位置和拖拽插入位置，并完成数组位置交换逻辑。
@Entry
@Component
struct GridExample {
@State numbers: string[] = [];
scroller: Scroller = new Scroller();
@State text: string = 'drag';

@Builder
pixelMapBuilder() {
Column() {
Text(this.text)
.fontSize(16)
.backgroundColor(0xF9CF93)
.width(80)
.height(80)
.textAlign(TextAlign.Center)
}
}

aboutToAppear() {
for (let i = 1; i <= 15; i++) {
this.numbers.push(i + '');
}
}

changeIndex(index1: number, index2: number) {
// Swap array positions
let temp = this.numbers[index1];
this.numbers[index1] = this.numbers[index2];
this.numbers[index2] = temp;
}

build() {
Column({ space: 5 }) {
Grid(this.scroller) {
ForEach(this.numbers, (day: string) => {
GridItem() {
Text(day)
.fontSize(16)
.backgroundColor(0xF9CF93)
.width(80)
.height(80)
.textAlign(TextAlign.Center)
.onTouch((event: TouchEvent) => {
if (event.type === TouchType.Up) {
this.text = day;
}
})
}
})
}
.columnsTemplate('1fr 1fr 1fr')
.columnsGap(10)
.rowsGap(10)
.onScrollIndex((first: number) => {
console.info(first.toString());
})
.width('90%')
.backgroundColor(0xFAEEE0)
.height(300)
.editMode(true) // Set whether the Grid enters editing mode. When entering editing mode, you can drag and drop the GridItem inside the Grid component
.onItemDragStart((event: ItemDragInfo, itemIndex: number) => { // When dragging the component bound to this event for the first time, a callback is triggered.
return this.pixelMapBuilder(); //Set the image displayed during the drag and drop process.
})
// The component bound to this event can be used as a drag and drop release target. When the drag behavior stops within the scope of this component, a callback is triggered.
.onItemDrop((event: ItemDragInfo, itemIndex: number, insertIndex: number, isSuccess: boolean) => {
// Drag the starting position of itemIndex, drag the insertion position of insertIndex
this.changeIndex(itemIndex, insertIndex)
})
}.width('100%').margin({ top: 5 })
}
}
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