一、前言
在学习API9的时候就写了一个DragView
,用于展示某个页面的悬浮可拖动的入口,特意丰富了许多的功能,今天分享给大家~。Demo基于API11。
二、思路
因为API本身就带有拖拽的手势,所以直接使用:PanGesture
,根据拖拽返回的坐标,动态的更新DragView
的position
坐标。即可实现拖拽的功能。
除了拖拽,还需要的是从停留位置,吸附到某个位置。我们使用animateTo
,结合坐标值即可完成很好的吸附效果。
三、准备容器
使用.position(this.curPosition)
来控制拖拽的UI位置。dragContentBuilder
方便自定义内容,组件的复用。
@State private curPosition: Position = { x: 0, y: 0 };build() {Stack() {if (this.dragContentBuilder) {this.dragContentBuilder()} else {this.defDragView()}}).position(this.curPosition).onClick(this.onClickListener)}
四、边界
一般而言,拖拽的边界肯定是当前屏幕中的,但是如果需求需要限制在某个区域,或者需要规避一些位置。所以我们准备一个边界对象,来更好的管理拖拽的边界。
boundArea: BoundArea = new BoundArea(0, 0, px2vp(display.getDefaultDisplaySync().width), px2vp(display.getDefaultDisplaySync().height))export class BoundArea {readonly start: number = 0readonly end: number = 0readonly top: number = 0readonly bottom: number = 0readonly width: number = 0readonly height: number = 0readonly centerX: number = 0readonly centerY: number = 0constructor(start: number, top: number, end: number, bottom: number) {this.start = startthis.top = topthis.end = endthis.bottom = bottomthis.width = this.end - this.startthis.height = this.bottom - this.topthis.centerX = this.width / 2 + this.startthis.centerY = this.height / 2 + this.top}}
boundArea
默认使用了整个屏幕的坐标。
五、容器大小
因为具体的UI是从外部传入的,所以宽高不确定,需要计算。我们这里使用onAreaChange
,绑定到容器上:
.onAreaChange((oldValue: Area, newValue: Area) => {let height = newValue.height as numberlet width = newValue.width as numberif ((this.dragHeight != height || this.dragWidth != width) && (height != 0 && width != 0)) {this.dragHeight = heightthis.dragWidth = width}})
可以看到,在容器发生改变的时候,我们保存它的宽高。
六、拖拽
拖拽手势使用起来还是很简单的:
private panOption: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.All });
direction
决定了可以在哪个方向拖,我们显然需要所有方向。当然如果后续需要限制拖动方向,修改即可。
将拖动事件绑定到容器上:
.gesture( // 绑定PanGesture事件,监听拖拽动作PanGesture(this.panOption).onActionStart((event: GestureEvent) => {this.changePosition(event.offsetX, event.offsetY)}).onActionUpdate((event: GestureEvent) => {this.changePosition(event.offsetX, event.offsetY)}).onActionEnd((event: GestureEvent) => {this.endPosition = this.curPositionthis.adsorbToEnd(this.endPosition.x, this.endPosition.y)}))
分别处理三个事件,onActionStart
和onActionUpdate
事件是独立的,但是逻辑一致所以全部使用this.changePosition(event.offsetX, event.offsetY)
处理。
private changePosition(offsetX: number, offsetY: number) {let targetX = this.endPosition.x + offsetX;let targetY = this.endPosition.y + offsetY;targetX = Math.max(this.boundArea.start, Math.min(targetX, this.boundArea.end - this.dragHeight));targetY = Math.max(this.boundArea.top, Math.min(targetY, this.boundArea.bottom - this.dragWidth));this.curPosition = { x: targetX, y: targetY };}
因为存在边界,所以我们需要限制curPosition
的变化,在当前拖动的坐标和边界值之间取合理的值。因为容器存在宽高,所以我们需要考虑到其宽高。
当手指抬起的时候,需要做动画吸附:
private adsorbToEnd(startX: number, startY: number) {let targetX = 0let targetY = 0if (startX <= (this.boundArea.centerX)) {targetX = this.boundArea.start + ((this.dragMargin.left ?? 0) as number)} else {targetX = this.boundArea.end - ((this.dragMargin.right ?? 0) as number) - this.dragWidth}let newTopBound = this.boundArea.top + ((this.dragMargin.top ?? 0) as number)let newBottomBound = this.boundArea.bottom - ((this.dragMargin.bottom ?? 0) as number) - this.dragWidthif (startY <= newTopBound) {targetY = newTopBound} else if (startY >= newBottomBound) {targetY = newBottomBound} else {targetY = startY}this.startMoveAnimateTo(targetX, targetY)}private startMoveAnimateTo(x: number, y: number) {animateTo({duration: 300,curve: Curve.Smooth, iterations: 1, playMode: PlayMode.Normal, onFinish: () => {this.endPosition = this.curPosition}}, () => {this.curPosition = { x: x, y: y }})}
startX <= (this.boundArea.centerX)
用于判断在边界的位置,根据位置来决定吸附到左边还是右边。计算出吸附的位置之后,只需要使用animateTo
来触发this.curPosition
的更新即可。
七、初始位置
如果不能控制一开始的显示位置,对于使用者的体验非常不好,所以我们可以新增一个参数Alignment
来更改初始位置:
dragAlign: Alignment = Alignment.BottomStart
可能还要微调位置,所以再加一个margin
:
dragMargin: Margin = {}
在onAreaChange的时候进行更新:
.onAreaChange((oldValue: Area, newValue: Area) => {//.....if (this.isNotInit) {this.initAlign()}})private initAlign() {this.isNotInit = falselet x = 0let y = 0let topMargin: number = (this.dragMargin.top ?? 0) as numberlet bottomMargin: number = (this.dragMargin.bottom ?? 0) as numberlet startMargin: number = (this.dragMargin.left ?? 0) as numberlet endMargin: number = (this.dragMargin.right ?? 0) as numberswitch (this.dragAlign) {case Alignment.Start:x = this.boundArea.start + startMarginbreak;case Alignment.Top:y = this.boundArea.top + topMarginbreak;case Alignment.End:x = this.boundArea.end - this.dragWidth - endMarginbreak;case Alignment.Bottom:y = this.boundArea.bottom - this.dragHeight - bottomMarginbreak;case Alignment.TopStart:x = this.boundArea.start + startMarginy = this.boundArea.top + topMarginbreak;case Alignment.BottomStart:x = this.boundArea.start + startMarginy = this.boundArea.bottom - this.dragHeight - bottomMarginbreak;case Alignment.BottomEnd:x = this.boundArea.end - this.dragWidth - endMarginy = this.boundArea.bottom - this.dragHeight - bottomMarginbreak;case Alignment.Center:x = this.boundArea.centerX - this.dragWidth / 2 + startMargin - endMarginy = this.boundArea.centerY - this.dragHeight / 2 + topMargin - bottomMarginbreak;}this.curPosition = { x: x, y: y }this.endPosition = this.curPosition}
只要稍微考虑容器宽高并计算下就好了。
八、使用
非常简单
DragView({dragAlign: Alignment.Center,dragMargin: bothway(10),dragContentBuilder:this.defDragView()})@BuilderdefDragView() {Stack() {Text("拖我").width(50).height(50).fontSize(15)}.shadow({radius: 1.5,color: "#80000000",offsetX: 0,offsetY: 1}).padding(18).borderRadius(30).backgroundColor(Color.White).animation({ duration: 200, curve: Curve.Smooth })}
当然你想往里面塞任何东西都行~
九、总结
当然还有很多人需要跨页面的悬浮窗,这可以参考应用内消息通知,活用subWindow.moveWindowTo(0, 0);
因为我使用的是Navigation
路由方案,所以放在顶层直接是跨页面的。
完整的代码:(懒得上传了,只有一个import,复制即用)
import { display, Position } from '@kit.ArkUI';@Preview@Componentexport struct DragView {private panOption: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.All });private endPosition: Position = { x: 0, y: 0 }private dragHeight: number = 0private dragWidth: number = 0private dragMargin: Margin = {}boundArea: BoundArea = new BoundArea(0, 0, px2vp(display.getDefaultDisplaySync().width), px2vp(display.getDefaultDisplaySync().height))private isNotInit: boolean = true@State private curPosition: Position = { x: 0, y: 0 };dragAlign: Alignment = Alignment.BottomStartonClickListener?: (event: ClickEvent) => void@BuilderParam dragContentBuilder: CustomBuilderbuild() {Stack() {if (this.dragContentBuilder) {this.dragContentBuilder()} else {this.defDragView()}}.onAreaChange((oldValue: Area, newValue: Area) => {let height = newValue.height as numberlet width = newValue.width as numberif ((this.dragHeight != height || this.dragWidth != width) && (height != 0 && width != 0)) {this.dragHeight = heightthis.dragWidth = width}if (this.isNotInit) {this.initAlign()}}).gesture( // 绑定PanGesture事件,监听拖拽动作PanGesture(this.panOption).onActionStart((event: GestureEvent) => {this.changePosition(event.offsetX, event.offsetY)}).onActionUpdate((event: GestureEvent) => {this.changePosition(event.offsetX, event.offsetY)}).onActionEnd((event: GestureEvent) => {this.endPosition = this.curPositionthis.adsorbToEnd(this.endPosition.x, this.endPosition.y)})).position(this.curPosition).onClick(this.onClickListener)}private adsorbToEnd(startX: number, startY: number) {let targetX = 0let targetY = 0if (startX <= (this.boundArea.centerX)) {targetX = this.boundArea.start + ((this.dragMargin.left ?? 0) as number)} else {targetX = this.boundArea.end - ((this.dragMargin.right ?? 0) as number) - this.dragWidth}let newTopBound = this.boundArea.top + ((this.dragMargin.top ?? 0) as number)let newBottomBound = this.boundArea.bottom - ((this.dragMargin.bottom ?? 0) as number) - this.dragWidthif (startY <= newTopBound) {targetY = newTopBound} else if (startY >= newBottomBound) {targetY = newBottomBound} else {targetY = startY}this.startMoveAnimateTo(targetX, targetY)}private changePosition(offsetX: number, offsetY: number) {let targetX = this.endPosition.x + offsetX;let targetY = this.endPosition.y + offsetY;targetX = Math.max(this.boundArea.start, Math.min(targetX, this.boundArea.end - this.dragHeight));targetY = Math.max(this.boundArea.top, Math.min(targetY, this.boundArea.bottom - this.dragWidth));this.curPosition = { x: targetX, y: targetY };}private startMoveAnimateTo(x: number, y: number) {animateTo({duration: 300, // 动画时长curve: Curve.Smooth, // 动画曲线iterations: 1, // 播放次数playMode: PlayMode.Normal, // 动画模式onFinish: () => {this.endPosition = this.curPosition}}, () => {this.curPosition = { x: x, y: y }})}private initAlign() {this.isNotInit = falselet x = 0let y = 0let topMargin: number = (this.dragMargin.top ?? 0) as numberlet bottomMargin: number = (this.dragMargin.bottom ?? 0) as numberlet startMargin: number = (this.dragMargin.left ?? 0) as numberlet endMargin: number = (this.dragMargin.right ?? 0) as numberswitch (this.dragAlign) {case Alignment.Start:x = this.boundArea.start + startMarginbreak;case Alignment.Top:y = this.boundArea.top + topMarginbreak;case Alignment.End:x = this.boundArea.end - this.dragWidth - endMarginbreak;case Alignment.Bottom:y = this.boundArea.bottom - this.dragHeight - bottomMarginbreak;case Alignment.TopStart:x = this.boundArea.start + startMarginy = this.boundArea.top + topMarginbreak;case Alignment.BottomStart:x = this.boundArea.start + startMarginy = this.boundArea.bottom - this.dragHeight - bottomMarginbreak;case Alignment.BottomEnd:x = this.boundArea.end - this.dragWidth - endMarginy = this.boundArea.bottom - this.dragHeight - bottomMarginbreak;case Alignment.Center:x = this.boundArea.centerX - this.dragWidth / 2 + startMargin - endMarginy = this.boundArea.centerY - this.dragHeight / 2 + topMargin - bottomMarginbreak;}this.curPosition = { x: x, y: y }this.endPosition = this.curPosition}@BuilderdefDragView() {Stack().width(100).height(100).backgroundColor(Color.Orange)}}export class BoundArea {readonly start: number = 0readonly end: number = 0readonly top: number = 0readonly bottom: number = 0readonly width: number = 0readonly height: number = 0readonly centerX: number = 0readonly centerY: number = 0constructor(start: number, top: number, end: number, bottom: number) {this.start = startthis.top = topthis.end = endthis.bottom = bottomthis.width = this.end - this.startthis.height = this.bottom - this.topthis.centerX = this.width / 2 + this.startthis.centerY = this.height / 2 + this.top}}
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