Flutter 再论编辑器的键盘处理

// 这里差点意思，不能和屏幕刷新同频，不太自然
// 最好还是借助 animation 来处理，但互相干扰，处理比较麻烦
// menubar 滑入
void slideinMenubar(int x) {
  double m = maxToolbarHeight ?? ui.windowHeight * 0.382; 
  toolbarHeight = toolbarHeight + x;
  if (toolbarHeight>=m-10) {
    toolbarHeight = m;
    setStatus();
  }
  else {
    setStatus();
    Future.delayed(const Duration(milliseconds: 1), (){
      slideinMenubar(x);
    });
  }
}

// menubar 滑出
void slideoutMenubar(int x) {
  toolbarHeight = toolbarHeight - x;
  if (toolbarHeight<=10) {
    toolbarHeight = 0;
    setStatus();
  }
  else {
    setStatus();
    Future.delayed(const Duration(milliseconds: 1), (){
      slideoutMenubar(x);
    });
  }
}

// 切换 menuLabel
void changeMenuLabel(BuildContext context, int choiceMenuLabel) {
  currentMenuLabel = choiceMenuLabel;
  // 菜单在底部
  if (toolbarHeight<=0) {
    isLockKeyboardBottom = selectedMenuLabel= true;
    slideinMenubar(10);
  }
  // 菜单已弹起
  else {
    isLockKeyboardBottom = true;
    selectedMenuLabel = false;
    SystemChannels.textInput.invokeMethod<void>(
      keyboardHeight<=0 ? 'TextInput.show' : 'TextInput.hide'
    );
  }
  setStatus();
}

// 切换 返回
void onPopInvoked<T>(bool didPop, T? result) {
  // 键盘&菜单在底部
  if (toolbarHeight<=0) {
    if (!didPop) {
      saveThenExit();
    }
  }
  // 键盘在底部, 菜单弹起
  else if(keyboardHeight<=0) {
    isLockKeyboardBottom = selectedMenuLabel = false;
    setStatus();
    slideoutMenubar(10);
  }
  // 键盘弹起, 菜单弹起
  else {
    isLockKeyboardBottom = false;
    SystemChannels.textInput.invokeMethod<void>('TextInput.hide');
  }
}

Duration? frameCallTime;

double lastKeyboardHeight = 0;

BuildContext? editContext;

void frameCallback(Duration callTime) {
  if (editContext==null || (frameCallTime!=null && frameCallTime!.compareTo(callTime)==0)) {
    return;
  }
  keyboardHeight = MediaQuery.of(editContext!).viewInsets.bottom;
  // show begin
  if (keyboardHeight > lastKeyboardHeight && lastKeyboardHeight <= 0) {
    keyboardStatus = KeyboardStatus.showing;
    selectedMenuLabel = false;
    Future.delayed(const Duration(milliseconds: 270), (){
      keyboardStatus = KeyboardStatus.show;
      isLockKeyboardBottom = selectedMenuLabel = false;
      toolbarHeight = keyboardHeight;
      cacheMaxToolbarHeight(keyboardHeight);
      setStatus();
    });
  }
  // hide end
  else if (keyboardHeight <= 0 && keyboardHeight < lastKeyboardHeight) {
    keyboardStatus = KeyboardStatus.hide;
    // 键盘在底部，说明是为了展示子菜单
    selectedMenuLabel = isLockKeyboardBottom;
  }
  // 剩下的就是 hiding 和 sliding ( 软键盘切换形态使得高度变化 ) 了
  else {
    keyboardStatus = KeyboardStatus.sliding;
  }
  if (isLockKeyboardBottom==false || toolbarHeight<keyboardHeight) {
    toolbarHeight = keyboardHeight;
  }
  lastKeyboardHeight = keyboardHeight;
  frameCallTime = callTime;
  setStatus();
}