OpenHarmony：RichEditor组件样例开发

使用 richEditor 组件实现一个富文本编辑框，包含富文本编辑区域和功能栏，功能栏中有多个按键，可以调整字体大小、字体样式、字体颜色、布局，并可以插入图片。

api 版本：api11

主页面

import { TitleBar } from '../../../../common/TitleBar';
import { Title } from './Title';@Extend(Column) function cardStyle() {.backgroundColor(Color.White).borderRadius(24).width('100%').padding(5)
}@Entry
@Component
struct RichEditorSample {@State setStyle: Boolean = false;@State setStyle1: Boolean = false;@State setStyle2: Boolean = false;@State setStyle3: Boolean = false;@State setStyle4: Boolean = false;@State setStyle5: Boolean = false;@State setStyle6: Boolean = false;@State styleDialog: Visibility = Visibility.None;@State fontWeightSet: FontWeight = FontWeight.Normal;@State fontStyleSet: FontStyle = FontStyle.Normal;@State fontDecorationSet: TextDecorationType = TextDecorationType.None;@State fontAlignLeftSet: TextAlign = TextAlign.Start;@State fontAlignMiddleSet: TextAlign = TextAlign.Center;@State fontAlignRightSet: TextAlign = TextAlign.End;@State tipsValue: number = 32;private start: number = -1;private end: number = -1;private fontColors: string[] = ["#FA2A2D","#FFBF00","#41BA41","#00AAEE","#3F56EA","#8A2BE2","#000000"];controller: RichEditorController = new RichEditorController();updateVisible(){this.setStyle = !this.setStyle;if(this.setStyle){this.styleDialog = Visibility.Visible;}else{this.styleDialog = Visibility.None;}}updateFontWeight(){this.setStyle1 = !this.setStyle1;if(this.setStyle1){this.fontWeightSet = FontWeight.Bolder;}else{this.fontWeightSet = FontWeight.Normal;}}updateFontStyle(){this.setStyle2 = !this.setStyle2;if(this.setStyle2){this.fontStyleSet = FontStyle.Italic;}else{this.fontStyleSet = FontStyle.Normal;}}updateFontDecoration(){this.setStyle3 = !this.setStyle3;if(this.setStyle3){this.fontDecorationSet = TextDecorationType.Underline;}else{this.fontDecorationSet = TextDecorationType.None;}}updateFontAlignLeft(){this.setStyle4 = !this.setStyle4;if(this.setStyle4){this.fontAlignLeftSet = TextAlign.Start;}else{this.fontAlignLeftSet = TextAlign.JUSTIFY;}}updateFontAlignMiddle(){this.setStyle5 = !this.setStyle5;if(this.setStyle5){this.fontAlignMiddleSet = TextAlign.Center;}else{this.fontAlignMiddleSet = TextAlign.JUSTIFY;}}updateFontAlignRight(){this.setStyle6 = !this.setStyle6;if(this.setStyle6){this.fontAlignRightSet = TextAlign.End;}else{this.fontAlignRightSet = TextAlign.JUSTIFY;}}build() {Column() {TitleBar({ title: $r('app.string.rich_editor_title') })Scroll() {Column() {Title({title:$r('app.string.rich_editor_title')}).height("10%")RichEditor({ controller: this.controller }).onReady(() => {this.controller.addTextSpan("Hello World。\n" +"Familiar images automatically give people a sense of calm and nostalgia. " +"Early web designers liked the elements of the 1980s, but today, the aesthetics of the 1990s.\n",{style:{fontColor: Color.Black,fontSize: 16}})this.controller.addImageSpan($r("app.media.addPhoto"),{imageStyle:{size: ["100px", "54px"]}})}).onSelect((value: RichEditorSelection) => {this.start = value.selection[0];this.end = value.selection[1];}).height("50%").width("100%")Stack() {Column() {Row({ space: 250 }) {Text($r('app.string.rich_editor_style')).fontSize(14).padding({top:5})Image($r('app.media.ic_close')).width(25).height(25).onClick(() => {this.styleDialog = Visibility.None})}.height(25).margin({bottom:10})Row({ space: 38 }) {Image($r('app.media.ic_B_normal')).width(15).height(15).onClick(() => {this.updateFontWeight()if(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontWeight: this.fontWeightSet}})}})Image($r('app.media.ic_I_normal')).width(15).height(15).onClick(() => {this.updateFontStyle()if(this.end!=this.start) {this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontStyle: this.fontStyleSet}})}})Image($r('app.media.ic_U_normal')).width(15).height(15).onClick(() => {this.updateFontDecoration()if(this.end!=this.start) {this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{decoration: {type: this.fontDecorationSet}}})}})Image($r('app.media.ic_left_normal')).width(15).height(15).onClick(() => {this.updateFontAlignLeft()if(this.end!=this.start) {this.controller.updateParagraphStyle({start: this.start,end: this.end,style:{textAlign:this.fontAlignLeftSet}})}})Image($r('app.media.ic_middle_normal')).width(15).height(15).onClick(() => {this.updateFontAlignMiddle()if(this.end!=this.start) {this.controller.updateParagraphStyle({start: this.start,end: this.end,style:{textAlign:this.fontAlignMiddleSet}})}})Image($r('app.media.ic_right_normal')).width(15).height(15).onClick(() => {this.updateFontAlignRight()if(this.end!=this.start) {this.controller.updateParagraphStyle({start: this.start,end: this.end,style:{textAlign:this.fontAlignRightSet}})}})}.height(25).margin({bottom:10})Row({ space: 30 }) {ForEach(this.fontColors,(item: string) => {Circle({ width: 15, height: 15 }).fill(item).onClick(() => {if(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontColor: item}})}})})}.height(25).margin({bottom:10})Row({ space: 30 }) {Text("Aa").width(24).height(24).fontSize(11).fontWeight(400).onClick(() => {this.tipsValue = this.tipsValue - 2if(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontSize: this.tipsValue/2}})}})Slider({ style: SliderStyle.InSet, value: this.tipsValue }).width(210).showTips(true, 'Size:' + this.tipsValue.toFixed()).onChange(value => {this.tipsValue = valueif(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontSize: this.tipsValue/2}})}})Text("Aa").width(24).height(24).fontSize(17).fontWeight(400).onClick(() => {this.tipsValue = this.tipsValue + 2if(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontSize: this.tipsValue/2}})}})}.height(25).margin({bottom:60})}.visibility(this.styleDialog).width("100%").height("85%").margin({bottom:"85%"}).zIndex(1).border({radius: { topLeft: 15, topRight: 15 },}).backgroundColor($r('app.color.background_light_gray'))Row({ space: 150 }) {Image($r('app.media.ic_textstyle_normal')).width(40).height(40).onClick(() => {this.updateVisible()})Image($r('app.media.ic_picture_normal')).width(35).height(35).onClick(() => {this.controller.addImageSpan($r("app.media.addPhoto"),{imageStyle:{size: ["100px", "54px"]}})})}.padding({top:"50%"}).justifyContent(FlexAlign.Center).width("100%").height("15%").zIndex(3)}.height("30%")}.alignItems(HorizontalAlign.Start).cardStyle().constraintSize({ minHeight: '100%' })}.width('95%').height('80%').backgroundColor($r('app.color.divider_block_color'))}.height('100%').width('100%').backgroundColor($r('app.color.divider_block_color')).padding({ left: 20, right: 20 })}
}

title 组件


@Component
export struct Title {private title!: Resource;build() {Column() {Row() {Text(this.title).fontSize(24).fontWeight(FontWeight.Bold)}.margin({top:"2%",left:"5%"}).width('100%')}.height('100%')}
}

更新字体样式

@State setStyle: Boolean = false;
@State fontWeightSet: FontWeight = FontWeight.Normal;
private start: number = -1;
private end: number = -1;
controller: RichEditorController = new RichEditorController();updateFontWeight(){this.setStyle1 = !this.setStyle1;if(this.setStyle1){this.fontWeightSet = FontWeight.Bolder;}else{this.fontWeightSet = FontWeight.Normal;}
}Image($r('app.media.ic_B_normal')).width(15).height(15).onClick(() => {  this.updateFontWeight()if(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontWeight: this.fontWeightSet}})}
})

设置一个 boolean 类型变量 setStyle1，设置字体是否加粗，以 setStyle1 的值来控制

点击加粗按钮，setStyle 变为 true，修改 fontWeightSet 的值，再通过 RichEditor 组件控制器的方法 updateSpanStyle 改变选中字段的样式

自定义字体选择滑动条

@State tipsValue: number = 32;Slider({ style: SliderStyle.InSet, value: this.tipsValue }).width(210).showTips(true, 'Size:' + this.tipsValue.toFixed()).onChange(value => {this.tipsValue = valueif(this.end!=this.start){this.controller.updateSpanStyle({start: this.start,end: this.end,textStyle:{fontSize: this.tipsValue/2}})}})

初始字号为 16，随着 slider 组件的滑动，字号随之变化

总结：

通过 controller.updateSpanStyle 接口修改字体的样式，通过 controller.addImageSpan 来插入图片，使用了 RichEditor、Slider 等组件实现一个富文本编辑功能页面。

注意：

RichEditor 组件框架层未处理拉起输入法时的界面规避，需要应用层处理，代码如下：

import { KeyboardAvoidMode } from '@ohos.arkui.UIContext';onWindowStageCreate(windowStage){windowStage.loadContent('pages/Index', (err, data) => {let a = windowStage.getMainWindowSync().getUIContext().getKeyboardAvoidMode();windowStage.getMainWindowSync().getUIContext().setKeyboardAvoidMode(KeyboardAvoidMode.OFFSET);if (err) {Logger.error(TAG, `Failed to load the content. Cause: ${JSON.stringify(err)}`)return}Logger.info(TAG, `Succeeded in loading the content. Data: ${JSON.stringify(data)}`)})
}

在应用 MainAbility/MainAbility.ts 文件中实现

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