![]() ![]() Wc. Int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) Anyway, the two solutions are good for me. The two solutions requires 4 lines (because the ctx.save() and ctx.restore() to preserve context). LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) I prefer this over the most popular because it is more concrete: talks about the transparency of the fill (I want to clean a rectangle), not the transparency of any operation. RoundRectButton.cpp : Defines the entry point for the application. ![]() You could fix this up by using GDI+ to do the drawing and setting antialiased drawing or by blitting a bitmap instead of painting with GDI/GDI+ calls. Unfortunately I can't show how to include a manifest off the top of my head.īelow however is very rudimentary code demonstrating the window region way. ) will just fail (at least it does for me when I try it). This should let you just paint the window as a round rectangle however, it is complicated by the fact that (I think) you need to include a manifest that sets the supported OS of your executable to be Windows 8 and up or else the call to CreateWindowEx(WS_EX_LAYERED. The new way : Since Windows 8 child windows can be created with WS_EX_LAYERED extended style. The trouble with this technique is that you can't have the boundary of the round rectangle be anti-aliased. The old school way : Use SetWindowRgn(.) to make the owner drawn button have a round rectangle shaped clipping region. The easy way: Paint the area outside of the round rectangle button the same color as the background color of its parent That said, there are at least three ways to owner draw a button as a round rectangle: When you paint them you have to paint a whole rectangle. create an empty region hRgn CreateRectRgn (0,0,0,0) //Create a region from a bitmap with. For all the other color values, their corresponding logical coordinates are used to create the region. See the credits page for more information.Windows by default are rectangles. To create the region, the bitmap data is scanned and all the RGB color values corresponding to the transparent color are skipped from processing. Website content licensed under the Creative Commons Attribution 4.0 International ( CC BY-4.0) license.Ĭopyright © 2023 by Peter Johnson. than trying to figure out why the srpm did not install out of the box. BrushCopy ( XRect, XBitMap, XRect, Color ) XBitMap. add client caps (ie: transparency) detect when the window uses 32-bit visuals. Handle, XRect, 0, RDW_ERASE or RDW_INVALIDATE or RDW_NOCHILDREN or RDW_UPDATENOW ) finally Canvas. Handle inherited Paint RedrawWindow ( Parent. Paint var XBitMap : TBitMap XOldDC : HDC XRect : TRect begin if ( csDesigning in ComponentState ) then inherited Paint else begin XRect := ClientRect XOldDC := Canvas. ExStyle or WS_EX_TRANSPARENT end procedure TMyPopUpTransPanel. CreateParams ( var Params : TCreateParams ) begin inherited CreateParams ( Params ) if not ( csDesigning in ComponentState ) then Params. Result := 0 end else inherited WndProc ( Message ) end procedure TMyPopUpTransPanel. ScreenToClient ( XPos ) TWMMouse ( Message ). Y PostMessage ( TWinControl ( XControl ). that is covered by a partially-transparent or alpha-blended child control. YPos + Top ), true, true ) if Assigned ( XControl ) and ( XControl is TWinControl ) then begin XPos := TWinControl ( XControl ). DrawThemeParentBackground(int hwnd, int hdc, Pointer prc) int.ControlAtPos ( POINT ( TWMMouse ( Message ). Msg <= WM_MOUSELAST ) ) then begin XPos := ClientToScreen ( POINT ( TWMMouse ( Message ). WndProc ( var Message : TMessage ) var XControl : TControl XPos : TPoint begin if not ( csDesigning in ComponentState ) and ( ( Message. ![]() HTNOWHERE end procedure TMyPopUpTransPanel. CMHitTest ( var Message : TCMHitTest ) begin Message. WMEraseBkGnd ( Var Message : TWMEraseBkGnd ) begin procedure TMyPopUpTransPanel. TextOut ( Width div 2, Height div 2, 'Transparent' ) end procedure TTransparentPanel. Rectangle ( 0, 0, Width, Height ) Canvas. ExStyle or WS_EX_TRANSPARENT end procedure TTransparentPanel. CreateParams ( Var Params : TCreateParams ) begin Inherited CreateParams ( Params ) Params. Create ( AOwner : TComponent ) begin Inherited Create ( AOwner ) ControlStyle := ControlStyle - end procedure TTransparentPanel. Type TTransparentPanel = class ( TPanel ) private procedure SetParent ( AParent : TWinControl ) override procedure WMEraseBkGnd ( Var Message : TWMEraseBkGnd ) message WM_EraseBkGnd protected procedure CreateParams ( Var Params : TCreateParams ) override procedure Paint override public constructor Create ( AOwner : TComponent ) override procedure Invalidate override end constructor TTransparentPanel. ![]()
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