学习 TTreeView [16] - 给 TTreeView 添加复选框 (回复 "丁永其" 的问题)

问题来源: http://www.cnblogs.com/del/archive/2008/05/15/1114450.html#1199402

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本例效果图:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, ComCtrls, StdCtrls;



type

  TForm1 = class(TForm)

    TreeView1: TTreeView;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    procedure FormCreate(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses CommCtrl;



//让 TreeView 带有复选框

procedure TForm1.FormCreate(Sender: TObject);

var

  H: HWND;

begin

  H := TreeView1.Handle;

  SetWindowLong(H, GWL_STYLE, GetWindowLong(H, GWL_STYLE) or TVS_CHECKBOXES);



  {下面的代码只是给 TreeView 添加内容}

  with TreeView1 do

  begin

    Align := alLeft;

    Items.Add(nil, 'AAA');

    Items.Add(nil, 'BBB');

    Items.Add(nil, 'CCC');

    Items.AddChild(Items[2], '111');

    Items.AddChild(Items[2], '222');

    Items.AddChild(Items[2], '333');

  end;

end;



//列举带有复选框的项

procedure TForm1.Button1Click(Sender: TObject);

var

  Node: TTreeNode;

  TVI: TTVItem;

begin

  for Node in TreeView1.Items do

  begin

    TVI.mask := TVIF_STATE;

    TVI.hItem := Node.ItemId;

    TreeView_GetItem(TreeView1.Handle, TVI);

    if TVI.state and $2000 = $2000 then

      ShowMessage(Node.Text);

  end;

end;



//取消所有选中(这是后来补充的, 所以效果图上没有)

procedure TForm1.Button2Click(Sender: TObject);

var

  Node: TTreeNode;

  TVI: TTVItem;

begin

  for Node in TreeView1.Items do

  begin

    TVI.mask := TVIF_STATE;

    TVI.hItem := Node.ItemId;

    TVI.stateMask := TVIS_STATEIMAGEMASK;

    TVI.state := $2000 shr 1;

    TreeView_SetItem(TreeView1.Handle, TVI);

  end;

end;



//选中所有(这是后来补充的, 所以效果图上没有)

procedure TForm1.Button3Click(Sender: TObject);

var

  Node: TTreeNode;

  TVI: TTVItem;

begin

  for Node in TreeView1.Items do

  begin

    TVI.mask := TVIF_STATE;

    TVI.hItem := Node.ItemId;

    TVI.stateMask := TVIS_STATEIMAGEMASK;

    TVI.state := $2000;

    TreeView_SetItem(TreeView1.Handle, TVI);

  end;

end;



end.