我用一个MDI子窗口作背景,如何让他总是充满客户区

Question

讲mdichild 窗口的 WindowState属性设为wsMaximized
不过我觉得你的意思不是这个，请说清楚好吗？

Answer 1

做背景也不要用子窗口吧，拦截WM_ERASEBKG消息，好像是这个消息

Answer 2

mdichild 窗口的 bordericons的biMaximize设为false
Mdichild 窗口的 WindowState属性设为wsMaximized

Answer 3

如果背景Mdichild 窗口的 WindowState属性设为wsMaximized
创建主窗口时没问题，
但再打开其他Mdichild，再还原，背景Mdichild也跟着变小了

Answer 4

用image吧
PROCEDURE TFrm_Main.ClientWndProc(VAR Message: TMessage);
VAR
  BkgCanvas:TCanvas;
  LeftTop,RightBottom:TPoint;
begin
  with Message do
    case Msg of
      WM_ERASEBKGND:
        begin
          //LeftTop:=ClientToScreen(Point(PanelBGD.Left,PanelBGD.Top));
          //RightBottom:=ClientToScreen(Point(PanelBGD.Left+PanelBGD.Width,PanelBGD.Top+PanelBGD.Height));
          LeftTop:=Point(frm_Main.Left,frm_Main.Top);
          RightBottom:=Point(frm_Main.Left+frm_Main.Width,frm_Main.Top+frm_Main.Height);
          BkgCanvas:=TCanvas.Create;//在FormClose中释放
          BkgCanvas.Handle:= TWMEraseBkGnd(Message).DC;
          BkgCanvas.StretchDraw(Rect(0,0,
                                     RightBottom.x-LeftTop.x,
                                     RightBottom.y-LeftTop.y),
                                Image1.Picture.Graphic);
          BKGCanvas.Free;
          Result := 1;
        end;
    else
      Result := CallWindowProc(FPrevClientProc, ClientHandle, Msg, wParam, lParam);
    end;
end;

Answer 5

我的背景不是图
是html