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    <p>The cause of this issue is located in the Paint method of the <a href="http://docwiki.embarcadero.com/Libraries/en/Vcl.StdCtrls.TButtonStyleHook"><code>TButtonStyleHook</code></a> (in the Vcl.StdCtrls unit) style hook class. </p> <p>Locate this code in the method</p> <pre><code>if FPressed then Details := StyleServices.GetElementDetails(tbPushButtonPressed) else if MouseInControl then //this condition is triggered even if the button is disabled Details := StyleServices.GetElementDetails(tbPushButtonHot) else if Focused then //this condition is triggered even if the button is disabled Details := StyleServices.GetElementDetails(tbPushButtonDefaulted) else if Control.Enabled then Details := StyleServices.GetElementDetails(tbPushButtonNormal) else Details := StyleServices.GetElementDetails(tbPushButtonDisabled); </code></pre> <p>And replace for this code </p> <pre><code>if FPressed then Details := StyleServices.GetElementDetails(tbPushButtonPressed) else if MouseInControl and Control.Enabled then Details := StyleServices.GetElementDetails(tbPushButtonHot) else if Focused and Control.Enabled then Details := StyleServices.GetElementDetails(tbPushButtonDefaulted) else if Control.Enabled then Details := StyleServices.GetElementDetails(tbPushButtonNormal) else Details := StyleServices.GetElementDetails(tbPushButtonDisabled); </code></pre> <p>Another option is rewrite the Style hook for the TButton : </p> <p>Check this code based in this article <a href="http://theroadtodelphi.wordpress.com/2012/02/26/fixing-a-vcl-style-bug-in-the-tbutton-component/">Fixing a VCL Style bug in the TButton component</a>. The advantage of ths code is which you are fixing two issues <a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=103708">103708</a> and <a href="http://qc.embarcadero.com/wc/qcmain.aspx?d=103962">103962</a>.</p> <pre><code>Uses Winapi.CommCtrl, Vcl.Themes, Vcl.Styles; type TCustomButtonH=class(TCustomButton); //we need this helper to access some strict private fields TButtonStyleHookHelper = class Helper for TButtonStyleHook protected function Pressed : Boolean; function DropDown: Boolean; end; //to avoid writting a lot of extra code we are to use TButtonStyleHook class and override the paint method TButtonStyleHookFix = class(TButtonStyleHook) protected procedure Paint(Canvas: TCanvas); override; end; { TButtonStyleHookFix } procedure TButtonStyleHookFix.Paint(Canvas: TCanvas); var LDetails : TThemedElementDetails; DrawRect : TRect; pbuttonImagelist : BUTTON_IMAGELIST; IW, IH, IY : Integer; LTextFormatFlags : TTextFormatFlags; ThemeTextColor : TColor; Buffer : string; BufferLength : Integer; SaveIndex : Integer; X, Y, I : Integer; BCaption : String; begin if StyleServices.Available then begin BCaption := Text; if Pressed then LDetails := StyleServices.GetElementDetails(tbPushButtonPressed) else if MouseInControl and Control.Enabled then LDetails := StyleServices.GetElementDetails(tbPushButtonHot) else if Focused and Control.Enabled then LDetails := StyleServices.GetElementDetails(tbPushButtonDefaulted) else if Control.Enabled then LDetails := StyleServices.GetElementDetails(tbPushButtonNormal) else LDetails := StyleServices.GetElementDetails(tbPushButtonDisabled); DrawRect := Control.ClientRect; StyleServices.DrawElement(Canvas.Handle, LDetails, DrawRect); if Button_GetImageList(handle, pbuttonImagelist) and (pbuttonImagelist.himl &lt;&gt; 0) and ImageList_GetIconSize(pbuttonImagelist.himl, IW, IH) then begin if (GetWindowLong(Handle, GWL_STYLE) and BS_COMMANDLINK) = BS_COMMANDLINK then IY := DrawRect.Top + 15 else IY := DrawRect.Top + (DrawRect.Height - IH) div 2; //here the image is drawn properly according to the ImageAlignment value case TCustomButton(Control).ImageAlignment of iaLeft : begin ImageList_Draw(pbuttonImagelist.himl, 0, Canvas.Handle, DrawRect.Left + 3, IY, ILD_NORMAL); Inc(DrawRect.Left, IW + 3); end; iaRight : begin ImageList_Draw(pbuttonImagelist.himl, 0, Canvas.Handle, DrawRect.Right - IW -3, IY, ILD_NORMAL); Dec(DrawRect.Right, IW - 3); end; iaCenter: begin ImageList_Draw(pbuttonImagelist.himl, 0, Canvas.Handle, (DrawRect.Right - IW) div 2, IY, ILD_NORMAL); end; iaTop : begin ImageList_Draw(pbuttonImagelist.himl, 0, Canvas.Handle, (DrawRect.Right - IW) div 2, 3, ILD_NORMAL); end; iaBottom: begin ImageList_Draw(pbuttonImagelist.himl, 0, Canvas.Handle, (DrawRect.Right - IW) div 2, (DrawRect.Height - IH) - 3, ILD_NORMAL); end; end; end; if (GetWindowLong(Handle, GWL_STYLE) and BS_COMMANDLINK) = BS_COMMANDLINK then begin if pbuttonImagelist.himl = 0 then Inc(DrawRect.Left, 35); Inc(DrawRect.Top, 15); Inc(DrawRect.Left, 5); Canvas.Font := TCustomButtonH(Control).Font; Canvas.Font.Style := []; Canvas.Font.Size := 12; LTextFormatFlags := TTextFormatFlags(DT_LEFT); if StyleServices.GetElementColor(LDetails, ecTextColor, ThemeTextColor) then Canvas.Font.Color := ThemeTextColor; StyleServices.DrawText(Canvas.Handle, LDetails, BCaption, DrawRect, LTextFormatFlags, Canvas.Font.Color); SetLength(Buffer, Button_GetNoteLength(Handle) + 1); if Length(Buffer) &lt;&gt; 0 then begin BufferLength := Length(Buffer); if Button_GetNote(Handle, PChar(Buffer), BufferLength) then begin LTextFormatFlags := TTextFormatFlags(DT_LEFT or DT_WORDBREAK); Inc(DrawRect.Top, Canvas.TextHeight('Wq') + 2); Canvas.Font.Size := 8; StyleServices.DrawText(Canvas.Handle, LDetails, Buffer, DrawRect, LTextFormatFlags, Canvas.Font.Color); end; end; if pbuttonImagelist.himl = 0 then begin if Pressed then LDetails := StyleServices.GetElementDetails(tbCommandLinkGlyphPressed) else if MouseInControl then LDetails := StyleServices.GetElementDetails(tbCommandLinkGlyphHot) else if Control.Enabled then LDetails := StyleServices.GetElementDetails(tbCommandLinkGlyphNormal) else LDetails := StyleServices.GetElementDetails(tbCommandLinkGlyphDisabled); DrawRect.Right := 35; DrawRect.Left := 3; DrawRect.Top := 10; DrawRect.Bottom := DrawRect.Top + 32; StyleServices.DrawElement(Canvas.Handle, LDetails, DrawRect); end; end else if (GetWindowLong(Handle, GWL_STYLE) and BS_SPLITBUTTON) = BS_SPLITBUTTON then begin Dec(DrawRect.Right, 15); DrawControlText(Canvas, LDetails, Text, DrawRect, DT_VCENTER or DT_CENTER); if DropDown then begin LDetails := StyleServices.GetElementDetails(tbPushButtonPressed); SaveIndex := SaveDC(Canvas.Handle); try IntersectClipRect(Canvas.Handle, Control.Width - 15, 0, Control.Width, Control.Height); DrawRect := Rect(Control.Width - 30, 0, Control.Width, Control.Height); StyleServices.DrawElement(Canvas.Handle, LDetails, DrawRect); finally RestoreDC(Canvas.Handle, SaveIndex); end; end; with Canvas do begin Pen.Color := StyleServices.GetSystemColor(clBtnShadow); MoveTo(Control.Width - 15, 3); LineTo(Control.Width - 15, Control.Height - 3); if Control.Enabled then Pen.Color := StyleServices.GetSystemColor(clBtnHighLight) else Pen.Color := Font.Color; MoveTo(Control.Width - 14, 3); LineTo(Control.Width - 14, Control.Height - 3); Pen.Color := Font.Color; X := Control.Width - 8; Y := Control.Height div 2 + 1; for i := 3 downto 0 do begin MoveTo(X - I, Y - I); LineTo(X + I + 1, Y - I); end; end; end else begin //finally the text is aligned and drawn depending of the value of the ImageAlignment property case TCustomButton(Control).ImageAlignment of iaLeft, iaRight, iaCenter : DrawControlText(Canvas, LDetails, BCaption, DrawRect, DT_VCENTER or DT_CENTER); iaBottom : DrawControlText(Canvas, LDetails, BCaption, DrawRect, DT_TOP or DT_CENTER); iaTop : DrawControlText(Canvas, LDetails, BCaption, DrawRect, DT_BOTTOM or DT_CENTER); end; end; end; end; { TButtonStyleHookHelper } function TButtonStyleHookHelper.DropDown: Boolean; begin Result:=Self.FDropDown; end; function TButtonStyleHookHelper.Pressed: Boolean; begin Result:=Self.FPressed; end; initialization TStyleManager.Engine.RegisterStyleHook(TButton, TButtonStyleHookFix); </code></pre>
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    1. PODisabling TButton issue on a VCL styled form
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    1. USRRUZ
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    1. CO+1 well done. I knew our resident VCL styles guru would get stuck into this one. I can't believe how poor the VCL code is here.
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      1. USDavid Heffernan
    2. COwhen writing a fix it is simply much cleaner to handle the not Control.Enabled condition first. It means you only have to test that property once.
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      1. USDavid Heffernan
    3. CONeeds more than "+1" Embarcadero should pay both of you for the extra efforts :)
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      1. USRaul
 

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