在TreeView中添加一个CheckBox

可以用变通的手法。
　　TreeView有Images属性不是吗？自己做三张小图片：全选中、部分选中、不选状态（直接拍下CheckBox三种状态的图片在加工一下就可以了），然后在点击事件中根据具体情况设置TTreeNodes的ImageIndex就OK了。
　　如果嫌麻烦的话就去Down一个控件，其实有些控件也是这样做的，界面上你是看不出来的.
**************
Manan Patel <mpatel@siemens-hearing.com>
重载TreeView的CreateParams：
type
TCheckBoxTreeView = class(TTreeView)
protected
procedure CreateParams(var Params: TCreateParams); override;
end;
procedure TCheckBoxTreeView.CreateParams(var Params: TCreateParams);
begin
inherited;
Params.Style:=Params.Style or TVS_CHECKBOXES;
{ TVS_CHECKBOXES declared in CommCtrl }
end;
如果要Check这个CheckBox，可以用下面的代码：
function IsNodeChecked(Node :TTreeNode) :Boolean;
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
TvItem.Mask := TVIF_STATE;
TvItem.hItem := Node.ItemId;
TreeView_GetItem(Node.TreeView.Handle, TvItem);
Result := (TvItem.State and TVIS_CHECKED) = TVIS_CHECKED;
end;
procedure SetNodeChecked(Node :TTreeNode; Checked :Boolean);
const
TVIS_CHECKED = $2000;
var
TvItem :TTVItem;
begin
FillChar(TvItem, SizeOf(TvItem), 0);
with TvItem do begin
hItem := Node.ItemId;
Mask := TVIF_STATE;
StateMask := TVIS_STATEIMAGEMASK;
if Checked then
TvItem.State :=TVIS_CHECKED
else
TvItem.State :=TVIS_CHECKED shr 1;
TreeView_SetItem(Node.TreeView.Handle, TvItem);
end;
end;
可以做成事件和封装成一个类：
private OldState :Boolean;
procedure Change(Node: TTreeNode); override;
begin
inherited Change(Node);
OldState := IsNodeChecked(Node);
end;
procedure Click; override;
var
NewState :Boolean;
begin
inherited Click;
NewState := IsNodeChecked(Self.Selected);
if NewState = OldState then Exit;
if (NewState) and Assigned(OnNodeChecked) then OnNodeChecked()
else if (not NewState) and Assigned(OnNodeUnChecked) then
OnNodeUnChecked()
// OnNodeChecked & OnNodeUnchecked will be events that you declare
end;
　
附件&gt;&gt;&gt;&gt; <a href="CheckTV.rar" target="_blank">CheckTV.pas</a>