flutter TextField 控制焦点位置

背景

使用Visibility来控制清理按钮的显示和隐藏，在设置Visibility的状态时，会导致TextField焦点丢失。使用AnimatedOpacity代替Visibility

在光标丢失后手动设置光标位置

void _setFocus({int? baseOffset}) {
    final int currentPosition =
        baseOffset ?? textController.selection.baseOffset;
    Future.delayed(Duration(milliseconds: 100), () {
      // Move focus to the end of the current text
      focusNode.requestFocus();
      Future.delayed(Duration(milliseconds: 100), () {
        // Save the current cursor position
        textController.selection = TextSelection.fromPosition(
          TextPosition(offset: currentPosition),
        );
      });
    });
  }