我正在尝试调整非无边框形式(bsNone边框样式)。可以使用以下代码完成此操作,但仅当应用程序未启用VCL样式时才能使用。
protected
procedure WMNCHitTest(var message: TWMNCHitTest); message WM_NCHITTEST;
....
procedure TForm1.WMNCHitTest(var message: TWMNCHitTest);
const
EDGEDETECT = 7;
var
deltaRect: TRect;
begin
inherited;
if BorderStyle = bsNone then
with Message, deltaRect do
begin
Left := XPos - BoundsRect.Left;
Right := BoundsRect.Right - XPos;
Top := YPos - BoundsRect.Top;
Bottom := BoundsRect.Bottom - YPos;
if (Top < EDGEDETECT) and (Left < EDGEDETECT) then
Result := HTTOPLEFT
else if (Top < EDGEDETECT) and (Right < EDGEDETECT) then
Result := HTTOPRIGHT
else if (Bottom < EDGEDETECT) and (Left < EDGEDETECT) then
Result := HTBOTTOMLEFT
else if (Bottom < EDGEDETECT) and (Right < EDGEDETECT) then
Result := HTBOTTOMRIGHT
else if (Top < EDGEDETECT) then
Result := HTTOP
else if (Left < EDGEDETECT) then
Result := HTLEFT
else if (Bottom < EDGEDETECT) then
Result := HTBOTTOM
else if (Right < EDGEDETECT) then
Result := HTRIGHT
end;
我也尝试过这样的事情并且它有相同的结果。然后,当启用VCL样式时,如何使其可调整大小?
非常感谢你。
procedure CreateParams(var params: TCreateParams); override;
...
procedure TForm1.CreateParams(var params: TCreateParams);
begin
BorderStyle := bsNone;
inherited;
params.ExStyle := params.ExStyle or WS_EX_STATICEDGE;
params.Style := params.Style or WS_SIZEBOX;
end;
答案 0 :(得分:1)
VCL样式破坏WM_NCHITTEST
消息处理程序的原因是表单的样式挂钩直接处理WM_NCHITTEST
。您可以覆盖它并重新获得如下控制:
protected
function DoHandleStyleMessage(var Message: TMessage): Boolean; override;
....
function TForm1.DoHandleStyleMessage(var Message: TMessage): Boolean;
begin
if Message.Msg=WM_NCHITTEST then begin
Result := False;
end else begin
Result := inherited;
end;
end;
现在将再次调用WM_NCHITTEST
的事件处理程序。当然,您将失去WM_NCHITTEST
的VCL样式处理程序提供的任何功能,但我怀疑这正是您想要的。