在Delphi 7下有TTreeView和TListView控件，有时候我们需要这两个控件相结合的功能，除了自己组合成这样的复合控件，还可以使用VT（Virtual TreeView）来实现。在前篇介绍了《Virtual Treeview 5.0.0的安装以及入门》后，我们继续学习进一步的应用。
1.新建Delphi应用程序，在窗体上放置TVirtualStringTree、TImageList、TXPManifest、TPopupMenu，右键ImageList添加两个16x16的图标，右键PopupMenu添加一个菜单项“节点信息”；
2.单元文件代码如下：
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{------------------------------------------------------------------------------- 在Delphi 7下Virtual Treeview的简单使用（二） http://blog.csdn.net/akof1314 -------------------------------------------------------------------------------} unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, VirtualTrees, StdCtrls, XPMan, ImgList, Menus; type TForm1 = class(TForm) vrtlstrngtrVST: TVirtualStringTree; btnAddRoot: TButton; xpmnfst1: TXPManifest; ilVST: TImageList; pmVST: TPopupMenu; mniN1: TMenuItem; procedure FormCreate(Sender: TObject); procedure btnAddRootClick(Sender: TObject); procedure vrtlstrngtrVSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType; var CellText: WideString); procedure vrtlstrngtrVSTFreeNode(Sender: TBaseVirtualTree; Node: PVirtualNode); procedure vrtlstrngtrVSTGetImageIndex(Sender: TBaseVirtualTree; Node: PVirtualNode; Kind: TVTImageKind; Column: TColumnIndex; var Ghosted: Boolean; var ImageIndex: Integer); procedure vrtlstrngtrVSTNewText(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; NewText: WideString); procedure vrtlstrngtrVSTEditing(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; var Allowed: Boolean); procedure vrtlstrngtrVSTGetPopupMenu(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; const P: TPoint; var AskParent: Boolean; var PopupMenu: TPopupMenu); procedure mniN1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} {------------------------------------------------------------------------------- Description: 定义一个记录类型，根据所需添加内容 -------------------------------------------------------------------------------} type PMyRec = ^TMyRec; TMyRec = record //记录自己的节点结构类型 Caption, SubCaption: String; ImageIndex: Integer; end; {------------------------------------------------------------------------------- Description: 窗体创建函数 -------------------------------------------------------------------------------} procedure TForm1.FormCreate(Sender: TObject); begin with vrtlstrngtrVST do begin NodeDataSize := SizeOf(TMyRec); //设置节点数据空间 RootNodeCount := 0; //设置初始化节点数 Images := ilVST; //图片关联 //---------------------开始：添加列头（也可以双击控件添加）----------------- with Header.Columns.Add do begin Text := '列一'; Width := 150; Options := Options - [coDraggable]; //不允许列头拖动 end; with Header.Columns.Add do begin Text := '列二'; Width := 120; end; //-----------------------结束：添加列头------------------------------------- Header.Options := Header.Options + [hoVisible] + [hoHotTrack]; //可见列头，滑过热点 Header.Height := 23; TreeOptions.SelectionOptions := TreeOptions.SelectionOptions + [toExtendedFocus] //让非主列也可以点击 + [toMultiSelect] //支持多选 + [toRightClickSelect]; //右键选择 { + [toFullRowSelect]; //整行选中} TreeOptions.MiscOptions := TreeOptions.MiscOptions + [toEditable]; //让节点可编辑，在Editing更能分列控制是否可编辑 EditDelay := 50; //两次单击间隔多久才出现编辑框 end; end; {------------------------------------------------------------------------------- Description: 添加节点 -------------------------------------------------------------------------------} procedure TForm1.btnAddRootClick(Sender: TObject); var RootNode,ChildNode: PVirtualNode; Data: PMyRec; begin //------------添加根节点----------- RootNode := vrtlstrngtrVST.AddChild(nil); Data := vrtlstrngtrVST.GetNodeData(RootNode); with Data^ do begin Caption := '第一行，第一列'; SubCaption := '第一行，第二列'; ImageIndex := 0; end; //------------添加子节点------------- ChildNode := vrtlstrngtrVST.AddChild(RootNode); Data := vrtlstrngtrVST.GetNodeData(ChildNode); with Data^ do begin Caption := '第二行，第一列'; SubCaption := '第二行，第二列'; ImageIndex := 1; end; //------------添加子节点------------- ChildNode := vrtlstrngtrVST.AddChild(RootNode); Data := vrtlstrngtrVST.GetNodeData(ChildNode); with Data^ do begin Caption := '第三行，第一列'; SubCaption := '第三行，第二列'; ImageIndex := 1; end; vrtlstrngtrVST.Expanded[RootNode] := True; //展开根节点 end; {------------------------------------------------------------------------------- Description: 树节点显示的字符串数据 -------------------------------------------------------------------------------} procedure TForm1.vrtlstrngtrVSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType; var CellText: WideString); var Data: PMyRec; begin Data := Sender.GetNodeData(Node); if Assigned(Data) then case Column of 0: CellText := Data.Caption; //列一显示结构体的Caption 1: CellText := Data.SubCaption; //列二显示结构体的SubCaption end; end; {------------------------------------------------------------------------------- Description: 节点的图片索引 -------------------------------------------------------------------------------} procedure TForm1.vrtlstrngtrVSTGetImageIndex(Sender: TBaseVirtualTree; Node: PVirtualNode; Kind: TVTImageKind; Column: TColumnIndex; var Ghosted: Boolean; var ImageIndex: Integer); var Data: PMyRec; begin Data := Sender.GetNodeData(Node); if Column = 0 then ImageIndex := Data.ImageIndex; //列一绑定图片索引 end; {------------------------------------------------------------------------------- Description: 释放节点数据 -------------------------------------------------------------------------------} procedure TForm1.vrtlstrngtrVSTFreeNode(Sender: TBaseVirtualTree; Node: PVirtualNode); var Data: PMyRec; begin Data := Sender.GetNodeData(Node); Finalize(Data^); end; {------------------------------------------------------------------------------- Description: 编辑框更新内容到节点 -------------------------------------------------------------------------------} procedure TForm1.vrtlstrngtrVSTNewText(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; NewText: WideString); var Data: PMyRec; begin Data := Sender.GetNodeData(Node); case Column of 0: Data.Caption := NewText; 1: Data.SubCaption := NewText; //将编辑框的值赋到节点上 end; end; {------------------------------------------------------------------------------- Description: 具体控制某列是否可以出现编辑框 -------------------------------------------------------------------------------} procedure TForm1.vrtlstrngtrVSTEditing(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; var Allowed: Boolean); begin case Column of 0: Allowed := False; //不让第一列可编辑 1: Allowed := True; //第二列可编辑，并且在编辑过程中，按TAB键会跳到下一同列节点进入编辑模式 end; end; {------------------------------------------------------------------------------- Description: 具体控制某列是否可以出现右键菜单 -------------------------------------------------------------------------------} procedure TForm1.vrtlstrngtrVSTGetPopupMenu(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex; const P: TPoint; var AskParent: Boolean; var PopupMenu: TPopupMenu); begin if Assigned(Node) then case Column of 0: PopupMenu := pmVST; //让第一列管理菜单 1: PopupMenu := nil; //让第二列无菜单 end; end; {------------------------------------------------------------------------------- Description: 右键菜单显示节点信息 -------------------------------------------------------------------------------} procedure TForm1.mniN1Click(Sender: TObject); var Data: PMyRec; begin Data := vrtlstrngtrVST.GetNodeData(vrtlstrngtrVST.FocusedNode); if Assigned(Data) then ShowMessage('当前节点：' + Data.Caption); end; end. |
3.运行结果如下图所示：
