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VCL Styles – Adding background images and colors to Delphi forms

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Adding a background image to a delphi form is a topic very well covered by many articles, but most of them doesn’t work or another produces a lot of flicker when the vcl styles are enabled. The common techniques to set a background image in a form includes :

  • Use a TImage component with the align property set to alClient
  • Use the OnPaint event of the Form and handle the WM_ERASEBKGND message
  • use the Canvas.Brush.Bitmap property of the form to assign a bitmap
  • and so on.

Since the introduction of the vcl styles, now you can use the style hooks to handle the paint operations of the TWinControl descendant, the main advantage about the styles hookz is which you can override the core paint methods directly, avoiding the flicker and in most cases you do not even need to handle the windows messages. So now I will how you how you can create a style hook to add a custom background image or color to a form including the non client area.

The first step is create a new Style hook descendant of the TFormStyleHook class and override the PaintNC and PaintBackground methods.

So the class definition will look like this

type
  TFormStyleHookBackround=class(TFormStyleHook)
  strict private
    type
      TSettings = class
      strict private
        FColor: TColor;
        FImageLocation: string;
        FBitmap: TBitmap;
        FUseColor: Boolean;
        FUseImage: Boolean;
        FEnabled: Boolean;
        procedure SetColor(const Value: TColor);
        procedure SetImageLocation(const Value: string);
        procedure SetUseColor(const Value: Boolean);
        procedure SetUseImage(const Value: Boolean);
      public
        property UseImage : Boolean read FUseImage write SetUseImage;
        property UseColor : Boolean read FUseColor write SetUseColor;
        property Color : TColor read FColor write SetColor;
        property ImageLocation : string read FImageLocation write SetImageLocation;
        property Bitmap : TBitmap read FBitmap;
        property Enabled : Boolean read FEnabled write FEnabled;
        constructor Create;
        destructor  Destroy;override;
      end;
    class var FNCSettings: TSettings;
    class var FBackGroundSettings: TSettings;
    class var FMergeImages: boolean;
  protected
    procedure PaintNC(Canvas: TCanvas); override;
    procedure PaintBackground(Canvas: TCanvas); override;
    class constructor Create;
    class destructor  Destroy;
  public
    class property MergeImages: boolean read FMergeImages write FMergeImages;
    class property NCSettings : TSettings read FNCSettings;
    class property BackGroundSettings : TSettings read FBackGroundSettings;
  end;

Note: the above class definition includes some additional elements to store the settings of the style hook like Bitmaps and Colors used.

Painting the background

The PaintBackground method, paints the background of the form filling the control area with the current vcl style background color, in this case we are use a bitmap or a custom color depnding of the setting of the hook.

procedure TFormStyleHookBackround.PaintBackground(Canvas: TCanvas);
var
  LRect   : TRect;
  RBitmap : TRect;
  L,H     : Integer;
begin
  //if the option is not enabled use the default inherited PaintBackground method
  if not BackGroundSettings.Enabled then
   inherited
  else
  begin
    //get he bounds of the control (form)
    LRect := Rect(0, 0, Control.ClientWidth, Control.ClientHeight);
    //use a custom color for the background?
    if  BackGroundSettings.UseColor then
    begin
     Canvas.Brush.Color:=BackGroundSettings.Color;
     Canvas.FillRect(LRect);
    end
    else
    //use a bitmap
    begin
      //check the size of the bitmap against the control bounds to detrine how the bitmap is drawn
      if (BackGroundSettings.Bitmap.Width<LRect.Width) or (BackGroundSettings.Bitmap.Height<LRect.Height) then
      begin
       Canvas.Brush.Bitmap := BackGroundSettings.BitMap;
       Canvas.FillRect(LRect);
      end
      else
      begin
       //check if the the background bitmap must be merged with non client area bitmap
       if not FMergeImages then
        Canvas.CopyRect(LRect,BackGroundSettings.Bitmap.Canvas,LRect)
       else
       begin
        RBitmap:=LRect;
        H:=_GetBorderSize.Top;
        L:=_GetBorderSize.Left;
        RBitmap.SetLocation(L, H);
        Canvas.CopyRect(LRect,BackGroundSettings.Bitmap.Canvas,RBitmap);
       end;
      end;
    end;
  end;
end;

The above code will produce results like these

Using a custom color background

Using a custom image background

Painting the Non client area

To handle the paint operations over the non client area in the old versions of windows (before to windows vista) you must handle the WM_NCPAINT windows message or since Windows Vista using the DWM API you can accomplish this task. But if you uses the vcl styles only you must need override the PaintNC method.

This is the implementation of the PaintNC method to use a custom color or image in the non client area.

procedure TFormStyleHookBackround.PaintNC(Canvas: TCanvas);
var
  LDetail: TThemedWindow;
  LDetails,
  CaptionDetails,
  IconDetails   : TThemedElementDetails;
  R, R1, DrawRect, ButtonRect, TextRect: TRect;
  CaptionBuffer: TBitmap;
  FButtonState: TThemedWindow;
  TextFormat: TTextFormat;
  LText: string;
  SrcBackRect     : TRect;
begin
  //if the setting is not enabled use the original PaintNC method
  if not NCSettings.Enabled then
  begin
   inherited ;
   exit;
  end;

  //check the border style of the form
  if Form.BorderStyle = bsNone then
  begin
    MainMenuBarHookPaint(Canvas);
    Exit;
  end;


  {init some parameters}
  _FCloseButtonRect := Rect(0, 0, 0, 0);
  _FMaxButtonRect := Rect(0, 0, 0, 0);
  _FMinButtonRect := Rect(0, 0, 0, 0);
  _FHelpButtonRect := Rect(0, 0, 0, 0);
  _FSysMenuButtonRect := Rect(0, 0, 0, 0);
  _FCaptionRect := Rect(0, 0, 0, 0);

  if not StyleServices.Available then
    Exit;
  R := _GetBorderSize;

  {draw caption}

  if (Form.BorderStyle <> bsToolWindow) and
     (Form.BorderStyle <> bsSizeToolWin) then
  begin
    if _FFormActive then
      LDetail := twCaptionActive
    else
      LDetail := twCaptionInActive
  end
  else
  begin
   if _FFormActive then
      LDetail := twSmallCaptionActive
    else
      LDetail := twSmallCaptionInActive
  end;
  CaptionBuffer := TBitmap.Create;
  CaptionBuffer.SetSize(_FWidth, R.Top);

  {draw caption border}
  DrawRect := Rect(0, 0, CaptionBuffer.Width, CaptionBuffer.Height);
  LDetails := StyleServices.GetElementDetails(LDetail);  //used for draw text in the caption

  //check if a must use a custom color or a bitmap
  if FNCSettings.UseColor then
  begin
    //use the select color to fill the background of the canvas
    CaptionBuffer.Canvas.Brush.Color:=FNCSettings.Color;
    CaptionBuffer.Canvas.FillRect(DrawRect);
  end
  else
  begin
    //use the bitmap to fill the canvas
    SrcBackRect.Left:=0;
    SrcBackRect.Top:=0;
    SrcBackRect.Width:=DrawRect.Width;
    SrcBackRect.Height:=DrawRect.Height;
    //SrcBackRect.SetLocation(FNCSettings.Bitmap.Width-DrawRect.Width, 0);
    //SrcBackRect.SetLocation(_GetBorderSize.Width, 0);
    CaptionBuffer.Canvas.CopyRect(DrawRect, FNCSettings.Bitmap.Canvas,SrcBackRect);
  end;

  TextRect := DrawRect;
  CaptionDetails := LDetails;

  {draw icon}
  if (biSystemMenu in TCustomFormHack(Form).BorderIcons) and
     (Form.BorderStyle <> bsDialog) and
     (Form.BorderStyle <> bsToolWindow) and
     (Form.BorderStyle <> bsSizeToolWin) then
  begin
    IconDetails := StyleServices.GetElementDetails(twSysButtonNormal);
    if not StyleServices.GetElementContentRect(0, IconDetails, DrawRect, ButtonRect) then
      ButtonRect := Rect(0, 0, 0, 0);
    R1 := Rect(0, 0, GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON));
    RectVCenter(R1, ButtonRect);
    if ButtonRect.Width > 0 then
      DrawIconEx(CaptionBuffer.Canvas.Handle, R1.Left, R1.Top, _GetIconFast.Handle, 0, 0, 0, 0, DI_NORMAL);
    Inc(TextRect.Left, ButtonRect.Width + 5);
    _FSysMenuButtonRect := ButtonRect;
  end
  else
    Inc(TextRect.Left, R.Left);

  {draw buttons}
  if (biSystemMenu in TCustomFormHack(Form).BorderIcons) then
  begin
    if (Form.BorderStyle <> bsToolWindow) and
       (Form.BorderStyle <> bsSizeToolWin) then
    begin
      if (_FPressedButton = HTCLOSE) and (_FHotButton = HTCLOSE) then
        FButtonState := twCloseButtonPushed
      else if _FHotButton = HTCLOSE then
        FButtonState := twCloseButtonHot
      else
        if _FFormActive then
          FButtonState := twCloseButtonNormal
        else
          FButtonState := twCloseButtonDisabled;
     end
    else
    begin
      if (_FPressedButton = HTCLOSE) and (_FHotButton = HTCLOSE) then
        FButtonState := twSmallCloseButtonPushed
      else if _FHotButton = HTCLOSE then
        FButtonState := twSmallCloseButtonHot
      else
        if _FFormActive then
          FButtonState := twSmallCloseButtonNormal
        else
          FButtonState := twSmallCloseButtonDisabled;
    end;

    LDetails := StyleServices.GetElementDetails(FButtonState);
    if not StyleServices.GetElementContentRect(0, LDetails, DrawRect, ButtonRect) then
      ButtonRect := Rect(0, 0, 0, 0);

    StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, LDetails, ButtonRect);

    if ButtonRect.Left > 0 then
      TextRect.Right := ButtonRect.Left;
    _FCloseButtonRect := ButtonRect;
  end;

  if (biMaximize in TCustomFormHack(Form).BorderIcons) and
     (biSystemMenu in TCustomFormHack(Form).BorderIcons) and
     (Form.BorderStyle <> bsDialog) and
     (Form.BorderStyle <> bsToolWindow) and
     (Form.BorderStyle <> bsSizeToolWin) then
  begin
    if Form.WindowState = wsMaximized then
    begin
      if (_FPressedButton = HTMAXBUTTON) and (_FHotButton = HTMAXBUTTON) then
        FButtonState := twRestoreButtonPushed
      else if _FHotButton = HTMAXBUTTON then
        FButtonState := twRestoreButtonHot
      else
      if _FFormActive then
        FButtonState := twRestoreButtonNormal
      else
        FButtonState := twRestoreButtonDisabled;
    end
    else
    begin
      if (_FPressedButton = HTMAXBUTTON) and (_FHotButton = HTMAXBUTTON) then
        FButtonState := twMaxButtonPushed
      else if _FHotButton = HTMAXBUTTON then
        FButtonState := twMaxButtonHot
      else
      if _FFormActive then
        FButtonState := twMaxButtonNormal
      else
        FButtonState := twMaxButtonDisabled;
    end;
    LDetails := StyleServices.GetElementDetails(FButtonState);

    if not StyleServices.GetElementContentRect(0, LDetails, DrawRect, ButtonRect) then
      ButtonRect := Rect(0, 0, 0, 0);
    if ButtonRect.Width > 0 then
      StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, LDetails, ButtonRect);
    if ButtonRect.Left > 0 then
      TextRect.Right := ButtonRect.Left;
    _FMaxButtonRect := ButtonRect;
  end;

  if (biMinimize in TCustomFormHack(Form).BorderIcons) and
     (biSystemMenu in TCustomFormHack(Form).BorderIcons) and
     (Form.BorderStyle <> bsDialog) and
     (Form.BorderStyle <> bsToolWindow) and
     (Form.BorderStyle <> bsSizeToolWin) then
  begin
    if (_FPressedButton = HTMINBUTTON) and (_FHotButton = HTMINBUTTON) then
      FButtonState := twMinButtonPushed
    else if _FHotButton = HTMINBUTTON then
      FButtonState := twMinButtonHot
    else
      if _FFormActive then
        FButtonState := twMinButtonNormal
      else
        FButtonState := twMinButtonDisabled;

    LDetails := StyleServices.GetElementDetails(FButtonState);

    if not StyleServices.GetElementContentRect(0, LDetails, DrawRect, ButtonRect) then
      ButtonRect := Rect(0, 0, 0, 0);
    if ButtonRect.Width > 0 then
      StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, LDetails, ButtonRect);
    if ButtonRect.Left > 0 then TextRect.Right := ButtonRect.Left;
    _FMinButtonRect := ButtonRect;
  end;

  if (biHelp in TCustomFormHack(Form).BorderIcons) and (biSystemMenu in TCustomFormHack(Form).BorderIcons) and
     ((not (biMaximize in TCustomFormHack(Form).BorderIcons) and
     not (biMinimize in TCustomFormHack(Form).BorderIcons)) or (Form.BorderStyle = bsDialog))
  then
  begin
    if (_FPressedButton = HTHELP) and (_FHotButton = HTHELP) then
      FButtonState := twHelpButtonPushed
    else if _FHotButton = HTHELP then
      FButtonState := twHelpButtonHot
    else
    if _FFormActive then
      FButtonState := twHelpButtonNormal
    else
      FButtonState := twHelpButtonDisabled;
    LDetails := StyleServices.GetElementDetails(FButtonState);

    if not StyleServices.GetElementContentRect(0, LDetails, DrawRect, ButtonRect) then
      ButtonRect := Rect(0, 0, 0, 0);
    if ButtonRect.Width > 0 then
      StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, LDetails, ButtonRect);

    if ButtonRect.Left > 0 then
      TextRect.Right := ButtonRect.Left;
    _FHelpButtonRect := ButtonRect;
  end;

  {draw text}
  TextFormat := [tfLeft, tfSingleLine, tfVerticalCenter];
  if Control.UseRightToLeftReading then
    Include(TextFormat, tfRtlReading);

  LText := Text;
  StyleServices.DrawText(CaptionBuffer.Canvas.Handle, CaptionDetails, LText, TextRect, TextFormat);
  _FCaptionRect := TextRect;

  {draw caption buffer}

  Canvas.Draw(0, 0, CaptionBuffer);
  CaptionBuffer.Free;

  {draw menubar}
  MainMenuBarHookPaint(Canvas);

  {draw left border}
  DrawRect := Rect(0, R.Top, R.Left, _FHeight - R.Bottom);
  if DrawRect.Bottom - DrawRect.Top > 0 then
    //use a color?
    if FNCSettings.UseColor then
    begin
      Canvas.Brush.Color:=FNCSettings.Color;
      Canvas.FillRect(DrawRect);
    end
    else
    begin
      if (DrawRect.Height<=FNCSettings.BitMap.Height) and (DrawRect.Width<=FNCSettings.BitMap.Width)  then
        Canvas.CopyRect(DrawRect,FNCSettings.Bitmap.Canvas,DrawRect)
      else
        Canvas.StretchDraw(DrawRect, FNCSettings.BitMap);
    end;

  {draw right border}
  DrawRect := Rect(_FWidth - R.Right, R.Top, _FWidth, _FHeight - R.Bottom);

  if DrawRect.Bottom - DrawRect.Top > 0 then
    //use a color?
    if FNCSettings.UseColor then
    begin
      Canvas.Brush.Color:=FNCSettings.Color;
      Canvas.FillRect(DrawRect);
    end
    else
    begin
      if (DrawRect.Height<=FNCSettings.BitMap.Height) and (Control.Width<=FNCSettings.BitMap.Width)  then
        Canvas.CopyRect(DrawRect,FNCSettings.Bitmap.Canvas,DrawRect)
      else
        Canvas.StretchDraw(DrawRect, FNCSettings.BitMap);
    end;

  {draw Bottom border}
  DrawRect := Rect(0, _FHeight - R.Bottom, _FWidth, _FHeight);

  if DrawRect.Bottom - DrawRect.Top > 0 then
    //use a color?
    if FNCSettings.UseColor then
    begin
      Canvas.Brush.Color:=FNCSettings.Color;
      Canvas.FillRect(DrawRect);
    end
    else
    begin
      if (DrawRect.Height<=FNCSettings.BitMap.Height) and (Control.Width<=FNCSettings.BitMap.Width)  then
        Canvas.CopyRect(DrawRect,FNCSettings.Bitmap.Canvas,DrawRect)
      else
      begin
        SrcBackRect.Left:=0;
        SrcBackRect.Top:=0;
        SrcBackRect.Width:=DrawRect.Width;
        SrcBackRect.Height:=DrawRect.Height;
        SrcBackRect.SetLocation(FNCSettings.BitMap.Width-DrawRect.Width, 0);
        Canvas.CopyRect(DrawRect, FNCSettings.BitMap.Canvas,SrcBackRect);
      end;
    end;
end;

And the result is

Using a custom color in the non client area

Using a custom image in the non client area

Putting it all together

Finally if you mix both methods (the background and the non client area) you can get very nice results

Using the class

The full source code of the TFormStyleHookBackround class is available here and is part of the vcl style utils project. to use it just include a reference to the Vcl.Styles.FormStyleHooks unit in your project and register the style hook like so.

  TStyleManager.Engine.RegisterStyleHook(TFrmMain, TFormStyleHookBackround);

To modify the background image of the form, use this code

  TFormStyleHookBackround.BackGroundSettings.UseImage := True;
  TFormStyleHookBackround.BackGroundSettings.ImageLocation := 'image.png'; //set the location of the image

To modify the background color of the form, use this code

  TFormStyleHookBackround.BackGroundSettings.UseColor := True;
  TFormStyleHookBackround.BackGroundSettings.Color := clRed;//set the colot

After of modify background color or image you must repaint the form sending the WM_PAINT message

Check this sample

Var
  LIndex: Integer;
begin
  for LIndex := 0 to ComponentCount - 1 do
    if Components[LIndex] is TWinControl then
    begin
      TWinControl(Components[LIndex]).Invalidate;
      TWinControl(Components[LIndex]).Perform(WM_PAINT, 0, 0);
    end;

  Self.Invalidate;
  Self.Perform(WM_PAINT, 0, 0);
end;

To customize the color of the non client area of the form use this code

  TFormStyleHookBackround.NCSettings.UseColor:= True;
  TFormStyleHookBackround.NCSettings.Color:= clGreen; //set the color

To assign an image to the non client area of the form use this code

  TFormStyleHookBackround.NCSettings.UseImage := True;
  TFormStyleHookBackround.NCSettings.ImageLocation := 'image.png'; //set the location of the image

After of modify color or image of the non client area you must repaint the NC using the WM_NCPAINT message

SendMessage(Handle, WM_NCPAINT, 0, 0);

Download the demo application (binaries) from here.

Author: Rodrigo

Just another Delphi guy.

21 thoughts on “VCL Styles – Adding background images and colors to Delphi forms

  1. Hello,

    Man, you’re doing great job with the VCL Styles, even better than guys from EMB are. Keep it up, it’s top notch!

    Much love,
    Patryk.

    • Thanks for you comments. I’m just extending the vcl styles and looking for new ways to use it, but the full credit is for Embarcadero and this great new feature called Vcl Styles.

  2. Interesting article – many thanks for sharing this useful technique.

    Great for those of us who fancy dressing up our apps without having to make the move to FireMonkey until we (and it) are ready.

  3. Wow!
    Keep it coming Rodrigo!
    :)

  4. Well done Rodrigo!!! That’s the idea allow the community to extend the do great stuffs like what you are doing!!!

  5. Pingback: Delphi XE3? - Seite 55 - Delphi-PRAXiS

  6. hola!!!! gracias por el articulo.
    no se si entiendes el Español pero mi ingles es muy malo
    quiero hacerte una consulta ya no soy experto
    como implementar esta clase en una aplicación MDI
    te comento con mas detalles al mostrar el formulario Main con WindowState = wsNormal este pinta el el fondo del color del estilo
    pero al mostrar el Main con WindowState = wsMaximized es pinta el fondo diferente como puedo hacer el efecto de pintar el fondo

  7. Thank you for your great work.
    I have used your TFormStyleHookNC it worked great but if you add a TMainMenu the MainMenu will disappear if you disable the vcl style in NC areas.
    I used your code from your WMIDelphiCodeGenerator.
    Any idea to solve it?

  8. Please HELP!!! I can’t make it work!!! The Project compiles, but nothing happens. The windows style remains the standard one!!

    This is my sample project source:

    program Project1;

    uses
    Vcl.Forms,
    Vcl.Themes,
    Vcl.Styles,
    Vcl.Styles.FormStyleHooks in ‘Vcl.Styles.FormStyleHooks.pas’,
    Winapi.Windows, Winapi.Messages,
    Unit1 in ‘Unit1.pas’ {Form1};

    {$R *.res}

    begin
    Application.Initialize;
    Application.MainFormOnTaskbar := True;
    Application.CreateForm(TForm1, Form1);
    TStyleManager.Engine.RegisterStyleHook(TForm1, TFormStyleHookBackground);
    Application.Run;
    end.

    unit Unit1;

    interface

    uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.Styles.FormStyleHooks, Vcl.StdCtrls;

    type
    TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    private
    { Private declarations }
    public
    procedure UPD;
    { Public declarations }
    end;

    var
    Form1: TForm1;

    implementation

    {$R *.dfm}

    procedure TForm1.Button1Click(Sender: TObject);
    begin
    TFormStyleHookBackground.BackGroundSettings.Enabled := true;
    TFormStyleHookBackground.BackGroundSettings.UseImage := True;
    TFormStyleHookBackground.BackGroundSettings.ImageLocation := ‘C:\Progetti\RADStudioXE2\TestStyles\titanium-texture.bmp’;
    TFormStyleHookBackground.NCSettings.Enabled := true;
    TFormStyleHookBackground.NCSettings.UseImage := True;
    TFormStyleHookBackground.NCSettings.ImageLocation := ‘C:\Progetti\RADStudioXE2\TestStyles\titanium-texture.bmp’;
    Form1.UPD;
    SendMessage(Form1.Handle, WM_NCPAINT, 0, 0);
    end;

    procedure TForm1.UPD;
    Var
    LIndex: Integer;
    begin
    for LIndex := 0 to ComponentCount – 1 do
    if Components[LIndex] is TWinControl then
    begin
    TWinControl(Components[LIndex]).Invalidate;
    TWinControl(Components[LIndex]).Perform(WM_PAINT, 0, 0);
    end;

    Self.Invalidate;
    Self.Perform(WM_PAINT, 0, 0);
    end;

    end.

    • Try enabling the style hook in the initialization part of the unit1

      Initialization
      TStyleManager.Engine.RegisterStyleHook(TForm1, TFormStyleHookBackground);
      
  9. Hola tengo un problema. porque no pinta el area non client area de los cuadros de dialogos(mensajes que muestra mi Formulario) solo pinta el area non client del Formulario.(que me falta agregar a mi aplicacion)

    procedure TForm1.FormCreate(Sender: TObject);
    begin
    TFormStyleHookBackground.NCSettings.Enabled:=true;
    end;

    Initialization
    TStyleManager.Engine.RegisterStyleHook(TForm, TFormStyleHookBackground);
    TFormStyleHookBackground.NCSettings.UseColor := True;
    TFormStyleHookBackground.NCSettings.Color :=clWebBlue;

    • Hola, este tipo de style hook solo funciona en formularios que decienden del TForm, asi que debes verificar la clase del dialogo que estas tratando de modificar.

  10. Hello, excellent article.
    I want to know if you can change the colors of TComboBox (especially button) and round buttons.
    If so, this tool is perfect.
    Thank you. Santiago.

    P / D: Sorry for my English.

  11. Hola, excelente artículo.
    Quiero saber si es posible modificar los colores del TComboBox (especialmente el del botón) y redondear los botones.
    Si es así, esta herramienta es perfecta.
    Gracias. Santiago.

    Navegando por el Post me dí cuenta que eras de Chile. Un abrazo.

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