![]() ![]() ![]() I've tried this, it make the checkbox have a lot of flickering. Send a repaint message to the parent window which will hopefully repaint the parent(which is the sit below the checkbox) withut sending a message down to its children(ie, the checkbox).So I am looking for advice on what techniques I can use to redraw the window such as: ![]() Although an application can draw a rectangle by calling the Polygon function, supplying the coordinates of each corner, the Rectangle function provides a simpler method. The source and destination blend functions are currently limited to ACSRCOVER. Syntax C++ int FillRect( in HDC hDC, in const RECT lprc, in HBRUSH hbr ) Parameters in hDC A handle to the device context. This function includes the left and top borders, but excludes the right and bottom borders of the rectangle. The alpha-blending function for source and destination bitmaps, a global alpha value to be applied to the entire source bitmap, and format information for the source bitmap. The FillRect function fills a rectangle by using the specified brush. What is the way I can clear my transparent window, Note I am familiar with WinAPI that you cant really clear a window AFAIK because you just repaint over the window. 5 contributors Feedback A rectangle is a four-sided polygon whose opposing sides are parallel and equal in length. The height, in logical units, of the source rectangle. I guess I have run into the problem everyone must get with transparent windows. ![]() This is important when the user changes the text inside the checkbox and I need to repaint it. My Problem: When repainting, I don't know how to erase my transparent background so I can draw on a "clear canvas". I have made it because as far as I know you cant have a transparent checkbox in native win32 and I need to use this checkbox in a NSIS installer. See the credits page for more information.I have created a Transparent Checkbox in Win32 C++. Website content licensed under the Creative Commons Attribution 4.0 International ( CC BY-4.0) license.Ĭopyright © 2023 by Peter Johnson. BrushCopy ( XRect, XBitMap, XRect, Color ) XBitMap. 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 ). YPos + Top ), true, true ) if Assigned ( XControl ) and ( XControl is TWinControl ) then begin XPos := TWinControl ( XControl ). 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. Because your background is set to: windowClass.hbrBackground (HBRUSH)GetStockObject (BLACKBRUSH) Of course you can set it to NULLBRUSH to make it look transparent: windowClass. Rectangle, Rectangle with square corners. 1 Answer Sorted by: 2 As if the bitmap itself has a black background. only the pixels involved in the text glyphs are drawn and all other pixels retain their old values) over the old text without erasing the background. CreateParams ( Var Params : TCreateParams ) begin Inherited CreateParams ( Params ) Params. Windows seven functions for drawing filled areas with borders are listed in the table below. You are transparently displaying 'transparent' text (i.e. 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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