この例で提供されているコードを使用して、TPageControlのTTabsheetに閉じるボタンを実装してページコントロールの各タブシートに閉じるボタンを描画する方法コード内でThemeServicesをStyle Servicesに置き換え、スタイルを適用するときに閉じるボタン表示も反応もしません。誰かが私にこの問題を解決するための別の道を教えてもらえますか?ありがとう!これは、OnDrawTabイベントのコードです。
procedure TFormMain.PageControlCloseButtonDrawTab(Control: TCustomTabControl;
TabIndex: Integer; const Rect: TRect; Active: Boolean);
var
CloseBtnSize: Integer;
PageControl: TPageControl;
TabCaption: TPoint;
CloseBtnRect: TRect;
CloseBtnDrawState: Cardinal;
CloseBtnDrawDetails: TThemedElementDetails;
begin
PageControl := Control as TPageControl;
if InRange(TabIndex, 0, Length(FCloseButtonsRect) - 1) then
begin
CloseBtnSize := 14;
TabCaption.Y := Rect.Top + 3;
if Active then
begin
CloseBtnRect.Top := Rect.Top + 4;
CloseBtnRect.Right := Rect.Right - 5;
TabCaption.X := Rect.Left + 6;
end
else
begin
CloseBtnRect.Top := Rect.Top + 3;
CloseBtnRect.Right := Rect.Right - 5;
TabCaption.X := Rect.Left + 3;
end;
CloseBtnRect.Bottom := CloseBtnRect.Top + CloseBtnSize;
CloseBtnRect.Left := CloseBtnRect.Right - CloseBtnSize;
FCloseButtonsRect[TabIndex] := CloseBtnRect;
PageControl.Canvas.FillRect(Rect);
PageControl.Canvas.TextOut(TabCaption.X, TabCaption.Y, PageControl.Pages[TabIndex].Caption);
if not UseThemes then
begin
if (FCloseButtonMouseDownIndex = TabIndex) and FCloseButtonShowPushed then
CloseBtnDrawState := DFCS_CAPTIONCLOSE + DFCS_PUSHED
else
CloseBtnDrawState := DFCS_CAPTIONCLOSE;
Winapi.Windows.DrawFrameControl(PageControl.Canvas.Handle,
FCloseButtonsRect[TabIndex], DFC_CAPTION, CloseBtnDrawState);
end
else
begin
Dec(FCloseButtonsRect[TabIndex].Left);
if (FCloseButtonMouseDownIndex = TabIndex) and FCloseButtonShowPushed then
CloseBtnDrawDetails := StyleServices.GetElementDetails(twCloseButtonPushed)
else
CloseBtnDrawDetails := StyleServices.GetElementDetails(twCloseButtonNormal);
StyleServices.DrawElement(PageControl.Canvas.Handle, CloseBtnDrawDetails,
FCloseButtonsRect[TabIndex]);
end;
end;
end;