如何实现键盘上方自定义工具栏

问题现象
跟随键盘的工具栏如何实现？

背景知识
自定义弹窗（CustomDialog）：通过CustomDialogController类显示自定义弹窗。使用弹窗组件时，优先考虑自定义弹窗，便于弹窗样式与内容的自定义。
defaultFocus：设置当前组件是否为当前页面上的默认焦点。
on('keyboardHeightChange')：开启固定态软键盘高度变化的监听，当软键盘由本窗口唤出并存在重叠区域时通知键盘高度变化。
Stack：堆叠容器，子组件按照顺序依次入栈，后一个子组件覆盖前一个子组件。
alignContent：设置子组件在容器内的对齐方式。该属性与通用属性align同时设置时，后设置的属性生效。
解决方案
针对跟随键盘的工具栏，可采用以下两种实现方案：

方案一：使用CustomDialog组件自定义工具栏。以下示例通过点击文本组件使弹窗自动获焦，设置弹窗从底部弹出，并为弹窗添加弹出与关闭时的过渡动画，以实现跟随键盘的动画效果。
// 自定义对话框组件，用于显示输入框
@CustomDialog
@Component
export struct Dialog {
dialogController: CustomDialogController;

build() {
Column() {
TextInput({ text: '', placeholder: 'input your word...' })
.type(InputType.Normal)
.defaultFocus(true) // 设置为默认聚焦状态
.onBlur(() => {
// 输入框失去焦点时关闭对话框
this.dialogController.close();
})
.height('50%')
.margin({ top: 25, left: 16, right: 16 });
}
.height(100)
.backgroundColor(Color.White);
}
}

@Entry
@Component
struct Index {
message: string = 'Hello World';
// 自定义对话框控制器，配置对话框的显示参数
customDialogController: CustomDialogController = new CustomDialogController({
builder: Dialog(), // 设置对话框内容组件
alignment: DialogAlignment.Bottom, // 对话框从底部弹出
cornerRadius: 0,
customStyle: true,
openAnimation: { duration: 0.001, tempo: 0 }, // 打开弹窗时动画设置
closeAnimation: { duration: 0.001, tempo: 0 }, // 关闭弹窗时动画设置
});

build() {
Column() {
// 点击按钮打开对话框
Text(this.message)
.onClick(() => {
this.customDialogController.open(); // 触发对话框显示
})
.id('HelloWorld')
.fontSize(50)
.fontWeight(FontWeight.Bold);
}
.height('100%')
.width('100%');
}
}
效果预览：

点击放大

方案二：自定义工具栏组件，借助堆叠容器Stack进行页面布局，将组件设置为底部横向居中。定义状态变量isVisible以控制自定义工具栏的显示与隐藏：在TextInput组件聚焦时显示，失焦时隐藏。同时，通过on('keyboardHeightChange')方法监听软键盘高度变化，依据键盘高度动态调整自定义工具栏的位置，使其紧贴于键盘上方。
import { window } from '@kit.ArkUI';

@Entry
@Component
struct Index {
message: string = '图文信息区域';
// 控制自定义工具栏组件可见性
@State isVisible: Visibility = Visibility.Hidden;
// 存储键盘高度信息
@State keyboardHeight: string = '0px';
controller: RichEditorController = new RichEditorController();

// 页面加载时监听键盘高度变化
aboutToAppear(): void {
window.getLastWindow(this.getUIContext().getHostContext()).then((win) => {
win.on('keyboardHeightChange', (height) => {
console.info('height' + height.toString());
if (height) {
this.keyboardHeight = height.toString() + 'px'; // 保存键盘高度
this.isVisible = Visibility.Visible; // 显示自定义组件
} else {
this.isVisible = Visibility.Hidden; // 隐藏自定义组件
}
});
});
}

build() {
// 使用Stack布局，底部对齐
Stack({ alignContent: Alignment.Bottom }) {
Column() {
Text(this.message)
.fontSize(52)
.height('90%')
.width('100%')
.textAlign(TextAlign.Center)
.fontColor(Color.Black);
// 操作按钮行
Row() {
Text('点击拉起键盘')
.fontColor(Color.White)
.width('90%')
.height('40')
.backgroundColor('#ff1a73f8')
.borderRadius(20)
.textAlign(TextAlign.Center)
.margin({ left: 16, right: 16 })
.onClick(() => {
this.isVisible = Visibility.Visible; // 显示自定义组件
setTimeout(() => {
focusControl.requestFocus('textArea'); // 焦点切换到输入框
}, 10);
});
}.height('10%').width('100%');
}
.expandSafeArea([SafeAreaType.KEYBOARD], [SafeAreaEdge.BOTTOM]); // 适配键盘区域

  // 遮罩层（点击隐藏自定义）  
  Column()  
    .width('100%')  
    .height('120%')  
    .opacity(0.5)  
    .backgroundColor('rgba(0,0,0,0.5)')  
    .onClick(() => {  
      this.isVisible = Visibility.Hidden; // 隐藏自定义组件  
    })  
    .visibility(this.isVisible)  
    .expandSafeArea([SafeAreaType.KEYBOARD], [SafeAreaEdge.BOTTOM, SafeAreaEdge.TOP]);  
  // 动态加载自定义组件  
  CommentComponent({ isVisible: this.isVisible, keyboardHeight: this.keyboardHeight });  
};  

}

// 页面卸载时隐藏自定义组件
aboutToDisappear(): void {
this.isVisible = Visibility.Hidden;
}
}

// 自定义工具栏组件
@Component
struct CommentComponent {
controller: RichEditorController = new RichEditorController();
@Link isVisible: Visibility;
@Link keyboardHeight: string;

build() {
Flex({ direction: FlexDirection.ColumnReverse, justifyContent: FlexAlign.Start, alignItems: ItemAlign.Stretch }) {
Row() {
RichEditor({ controller: this.controller })
.id('textArea') // 设置输入框ID用于焦点控制
.placeholder('喜欢就评论一下吧~', { fontColor: Color.Gray, font: { size: 16, weight: FontWeight.Normal } })
.width('65%');
Flex({ direction: FlexDirection.Row, justifyContent: FlexAlign.End, alignItems: ItemAlign.Stretch }) {
Image($r('app.media.startIcon')).height(20).constraintSize({ minWidth: 20, maxWidth: 20 });
}
.width(110);
}
.margin({
top: 10,
bottom: this.keyboardHeight, // 根据键盘高度设置动态调整底部边距
left: 10,
right: 10
})
.border({ width: 1 })
.borderRadius(50);
}
.width('100%')
.height(380)
.expandSafeArea([SafeAreaType.KEYBOARD], [SafeAreaEdge.BOTTOM, SafeAreaEdge.TOP]) // 适配键盘区域
.backgroundColor(Color.White)
.visibility(this.isVisible);
}
}
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