D7控件dw_cd_VirtualTreeview_v4.5.2DemosAdvanced---TVirtualStringTree用法

VST1: TVirtualStringTree; 
//按钮公用函数，根据不同 标签tag区分，
Screen.Cursor := crHourGlass; //设置屏幕鼠标的形状为crhourGlass 
  with VST1 do
  try
    Start := GetTickCount;  // Start: Cardinal;
    case (Sender as TButton).Tag of
      0: // add to root
        begin
          Count := StrToInt(NodeCountEdit.Text);
          RootNodeCount := Integer(RootNodeCount) + Count; //TVirtualStringTree的属性，写函数写好添加功能
        end;
      1: // add as child
        if Assigned(FocusedNode) then
        begin
          Count := StrToInt(NodeCountEdit.Text);
          ChildCount[FocusedNode] := Integer(ChildCount[FocusedNode]) + Count; //TVirtualStringTree的属性，写函数写好添加子项功能
          Expanded[FocusedNode] := True;
          InvalidateToBottom(FocusedNode);
        end;
    end;
    Label1.Caption := Format('Last operation duration: %d ms', [GetTickCount - Start]);//计算耗时毫秒
    Label3.Caption := Format('Nodes in tree: %d', [VST1.TotalCount]);
  finally
    Screen.Cursor := crDefault;//恢复光标
  end;
  -------------------
  VST1.Clear; //清除
  VST1.DeleteSelectedNodes;//删除 所选择的项
  VST1.TreeOptions.PaintOptions + [toShowBackground] //在子集里面添加可以显示背景图
  ------------------
  begin
  with OPD do //TOpenPictureDialog
  begin
    if Execute then
    begin
      VST1.Background.LoadFromFile(FileName);  //加载背景图片，貌似bmp格式会好些
      //  VST1.Invalidate //隐藏背景图
    end;
  end;
end;

----------------
通过TRadioGroup的第二个单选，巧妙地：
with VST2.TreeOptions do
    if ThemeRadioGroup.ItemIndex = 0 then
      PaintOptions := PaintOptions + [toThemeAware]  //添加子集
    else
      PaintOptions := PaintOptions - [toThemeAware];
  RadioGroup1.Enabled := ThemeRadioGroup.ItemIndex = 1; //巧妙地取为 boolean类型
  RadioGroup2.Enabled := ThemeRadioGroup.ItemIndex = 1;
  ---------------
    TCheckImageKind = (  //定义的枚举类型
    ckLightCheck,     // gray cross
    ckDarkCheck,      // black cross
    ckLightTick,      // gray tick mark
    ckDarkTick,       // black tick mark
    ckFlat,           // flat images (no 3D border)
    ckXP,             // Windows XP style
    ckCustom,         // application defined check images
    ckSystem,         // System defined check images.
    ckSystemFlat      // Flat system defined check images.
  );
  VST2.CheckImageKind := TCheckImageKind(CheckMarkCombo.ItemIndex);//通过combobox的值巧妙地取出枚举类型值并赋值给
  -------------
  with Sender as TCheckBox, AlignTree.Header do
  Options := Options + [hoShowImages];//显示图像
  Options := Options + [hoVisible]  //可以显示表格 头标题 [coEnabled]是否可以失效
  ChangeHeaderText; //显示文字或隐藏
  ----------------
  可以做像预览的效果，当页面上无法完全显示时，可以浮动显示整个字段。--有待分析。
  Label显示多行字还是不错的，比Memo好看,但后者可以复制操作等。
  -------------
  Columns = < //设定里面的每一栏 是否可以点击或高亮显示，--有待分析。
      item
        ImageIndex = 1
        Options = [coDraggable, coEnabled, coResizable, coShowDropMark, coVisible] 
        Position = 0
        Spacing = -1
        Width = 200
        WideText = 'Default drawing'
        WideHint = 'This column is drawn entirely by the tree.'
      end