鸿蒙9+ 现在不支持鸿蒙体系电视,但是以后肯定是必须会支持的,以是直接学arkts就完事了,现在的api9+对焦点控制还是不够直接简便,估计还在完善中,但是可以通过自定义component来实现一下
首先踩坑:
- Row官方说自身属性是可获焦的,但是单独利用是没法获焦的,以是必须在里面添加一个可获焦的子view,但是通常所有的子view都是由获焦和离焦状态的,以是不能所有的子view都加上focusable=true,这里可以通过@Consume来同步整个组件内部的焦点状态, 注意这个修饰符达到同步的条件是参数名千篇一律!!!
- @Component
- export struct RowFocusable {
- compWidth: Length = '90vp'
- compHeight: Length = '28vp'
- compBorderRadius: Length = '14vp'
- alignItems: VerticalAlign = VerticalAlign.Center
- justifyContent: FlexAlign = FlexAlign.Center
- @Consume focusState: number
- @Builder doAddChild(){}
- @BuilderParam addChild: () => void = this.doAddChild;
- build() {
- Row() {
- //扯淡的玩意,容器布局的子节点没有获焦能力的话,容器布局就不会获焦,
- //但是子节点能获焦的话,那其他所有有焦点态的子节点也必须设置可获焦,那走焦的时候会在子节点之间走动,不合理,非常的不合理,
- //竟然没有父组件拦截焦点的方法
- Text('').focusable(true)
- .onFocus(()=>{
- this.focusState = ComponentsConstants.FOCUS_STATE_FOCUSED
- })
- .onBlur(()=>{
- this.focusState = ComponentsConstants.FOCUS_STATE_NORMAL
- }).width('0vp')
- this.addChild()
- }
- .width(this.compWidth).height(this.compHeight)
- .justifyContent(this.justifyContent)
- .alignItems(this.alignItems)
- .focusOnTouch(true)
- .borderWidth(2)
- .borderRadius(this.compBorderRadius)
- .borderStyle(BorderStyle.Solid)
- .onFocus(()=>{
- })
- .onBlur(()=>{
- })
- .stateStyles({
- focused: {
- .backgroundColor($r('app.color.transparent')
- },
- normal: {
- .backgroundColor($r('app.color.transparent')
- },
- })
- }
- }
复制代码 自定义component 反面直接设置底子属性,像上面这种只有一个@BuildParam方法的可以直接这样写,在大括号反面接上必要添加的子组件即可:
- @Component
- export struct ImageButton {
- btnWidth: Length = '90vp'
- btnHeight: Length = '28vp'
- imgWidth: Length = '15vp'
- imgHeight: Length = '15vp'
- tvCfg: TextFocusConfig | undefined = undefined
- imgCfg: ImageFocusConfig | undefined = undefined
- @Provide focusState: number = ComponentsConstants.FOCUS_STATE_NORMAL
- @Builder buildImage() {
- ImageFocusable({imgCfg: this.imgCfg}).width(this.imgWidth).height(this.imgHeight)
- }
- @Builder buildText() {
- TextFocusable({tvCfg: this.tvCfg})
- }
- build() {
- RowFocusable({ compWidth: this.btnWidth, compHeight: this.btnHeight }) {
- this.buildImage()
- this.buildText()
- }
- }
- }
- //自定义,统一设置占位图
- @Component
- export struct ImageFocusable {
- @Consume focusState: number
- imgCfg: ImageFocusConfig|undefined
- build() {
- Image(this.focusState==ComponentsConstants.FOCUS_STATE_FOCUSED ? this.imgCfg.imgResFocused : this.imgCfg.imgResNormal)
- .objectFit(ImageFit.Contain)
- .enabled(true)
- .alt($r('app.media.poster_placeholder'))
- }
- }
- //这里定义成config类,是为了方便组件层级太深时,更好的透传,比如上面ImageButton
- export class ImageFocusConfig {
- imgResNormal: ResourceStr
- imgResFocused: ResourceStr
- constructor(imgResNormal,imgResFocused) {
- this.imgResNormal = imgResNormal
- this.imgResFocused = imgResFocused
- }
- }
- @Component
- export struct TextFocusable {
- @Consume focusState: number
- tvCfg: TextFocusConfig | undefined
- build() {
- if (this.tvCfg != null) {
- Text(this.tvCfg!.text)
- .fontColor(this.focusState == ComponentsConstants.FOCUS_STATE_FOCUSED ? this.tvCfg!.focusColor : this.tvCfg.normalColor)
- .textAlign(this.tvCfg.textAlign)
- .maxLines(this.tvCfg.maxLine)
- .textOverflow({overflow: this.tvCfg.textOverFlow})
- .align(Alignment.Center)
- .width(this.tvCfg.width)
- .height(this.tvCfg.height)
- .fontSize(this.tvCfg.textSize)
- }
- }
- }
- export class TextFocusConfig {
- text: ResourceStr
- textSize: Length
- width: Length
- height: Length
- normalColor: ResourceColor
- focusColor: ResourceColor
- selectColor: ResourceColor
- textAlign: TextAlign
- maxLine: number
- textOverFlow: TextOverflow
- constructor()
- constructor(text?)
- constructor(text?, tvSize?)
- constructor(text?, tvSize?, width?, height?)
- constructor(text?, tvSize?, width?, height?, normalColor?, focusColor?, selectColor?)
- constructor(text?, tvSize?, width?, height?, normalColor?, focusColor?, selectColor?, textAlign?, maxLine?, textOverFlow?) {
- this.text = text ?? ''
- this.textSize = tvSize ?? '14vp'
- this.width = width ?? 'auto'
- this.height = height ?? 'auto'
- this.normalColor = normalColor ?? $r('app.color.white_70')
- this.focusColor = focusColor ?? $r('app.color.white_100')
- this.selectColor = selectColor ?? $r('app.color.tv_color_selected')
- this.textAlign = textAlign ?? TextAlign.Start
- this.maxLine = maxLine ?? 1
- this.textOverFlow = textOverFlow ?? TextOverflow.Ellipsis
- }
- setText(text): TextFocusConfig {
- this.text = text
- return this
- }
- setTextSize(size): TextFocusConfig {
- this.textSize = size
- return this
- }
- setWith(w): TextFocusConfig {
- this.width = w
- return this
- }
- setHeight(h): TextFocusConfig {
- this.height = h
- return this
- }
- }
复制代码 像自定义text这种组件,很多属性都没法直接设置,以是必要添加自己定名的属性,然后也没有焦点态的方法,以是只能通过@Consume focusState: number 来同步父子组件之间的焦点状态,别的封装成config的利益还是挺多的,自我挖掘吧
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