有一个现成的,参考一下吧TreeView有个Images属性,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。 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;
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。
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;