Как изменить цвет TButton?

{ 
  You cannot change the color of a standard TButton, 
  since the windows button control always paints itself with the 
  button color defined in the control panel. 
  But you can derive derive a new component from TButton and handle 
  the and drawing behaviour there. 
} 
 
 
unit ColorButton; 
 
interface 
 
uses 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, 
  StdCtrls, Buttons, ExtCtrls; 
 
type 
  TDrawButtonEvent = procedure(Control: TWinControl; 
    Rect: TRect; State: TOwnerDrawState) of object; 
 
  TColorButton = class(TButton) 
  private 
    FCanvas: TCanvas; 
    IsFocused: Boolean; 
    FOnDrawButton: TDrawButtonEvent; 
  protected 
    procedure CreateParams(var Params: TCreateParams); override; 
    procedure SetButtonStyle(ADefault: Boolean); override; 
    procedure CMEnabledChanged(var Message: TMessage); message CM_ENABLEDCHANGED; 
    procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED; 
    procedure CNMeasureItem(var Message: TWMMeasureItem); message CN_MEASUREITEM; 
    procedure CNDrawItem(var Message: TWMDrawItem); message CN_DRAWITEM; 
    procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message WM_LBUTTONDBLCLK; 
    procedure DrawButton(Rect: TRect; State: UINT); 
  public 
    constructor Create(AOwner: TComponent); override; 
    destructor Destroy; override; 
    property Canvas: TCanvas read FCanvas; 
  published 
    property OnDrawButton: TDrawButtonEvent read FOnDrawButton write FOnDrawButton; 
    property Color; 
  end; 
 
procedure Register; 
 
implementation 
 
procedure Register; 
begin 
  RegisterComponents('Samples', [TColorButton]); 
end; 
 
constructor TColorButton.Create(AOwner: TComponent); 
begin 
  inherited Create(AOwner); 
  FCanvas := TCanvas.Create; 
end; 
 
destructor TColorButton.Destroy; 
begin 
  inherited Destroy; 
  FCanvas.Free; 
end; 
 
procedure TColorButton.CreateParams(var Params: TCreateParams); 
begin 
  inherited CreateParams(Params); 
  with Params do Style := Style or BS_OWNERDRAW; 
end; 
 
procedure TColorButton.SetButtonStyle(ADefault: Boolean); 
begin 
  if ADefault <> IsFocused then 
  begin 
    IsFocused := ADefault; 
    Refresh; 
  end; 
end; 
 
procedure TColorButton.CNMeasureItem(var Message: TWMMeasureItem); 
begin 
  with Message.MeasureItemStruct^ do 
  begin 
    itemWidth  := Width; 
    itemHeight := Height; 
  end; 
end; 
 
procedure TColorButton.CNDrawItem(var Message: TWMDrawItem); 
var 
  SaveIndex: Integer; 
begin 
  with Message.DrawItemStruct^ do 
  begin 
    SaveIndex := SaveDC(hDC); 
    FCanvas.Lock; 
    try 
      FCanvas.Handle := hDC; 
      FCanvas.Font := Font; 
      FCanvas.Brush := Brush; 
      DrawButton(rcItem, itemState); 
    finally 
      FCanvas.Handle := 0; 
      FCanvas.Unlock; 
      RestoreDC(hDC, SaveIndex); 
    end; 
  end; 
  Message.Result := 1; 
end; 
 
procedure TColorButton.CMEnabledChanged(var Message: TMessage); 
begin 
  inherited; 
  Invalidate; 
end; 
 
procedure TColorButton.CMFontChanged(var Message: TMessage); 
begin 
  inherited; 
  Invalidate; 
end; 
 
procedure TColorButton.WMLButtonDblClk(var Message: TWMLButtonDblClk); 
begin 
  Perform(WM_LBUTTONDOWN, Message.Keys, Longint(Message.Pos)); 
end; 
 
procedure TColorButton.DrawButton(Rect: TRect; State: UINT); 
var 
  Flags, OldMode: Longint; 
  IsDown, IsDefault, IsDisabled: Boolean; 
  OldColor: TColor; 
  OrgRect: TRect; 
begin 
  OrgRect := Rect; 
  Flags := DFCS_BUTTONPUSH or DFCS_ADJUSTRECT; 
  IsDown := State and ODS_SELECTED <> 0; 
  IsDefault := State and ODS_FOCUS <> 0; 
  IsDisabled := State and ODS_DISABLED <> 0; 
 
  if IsDown then Flags := Flags or DFCS_PUSHED; 
  if IsDisabled then Flags := Flags or DFCS_INACTIVE; 
 
  if IsFocused or IsDefault then 
  begin 
    FCanvas.Pen.Color := clWindowFrame; 
    FCanvas.Pen.Width := 1; 
    FCanvas.Brush.Style := bsClear; 
    FCanvas.Rectangle(Rect.Left, Rect.Top, Rect.Right, Rect.Bottom); 
    InflateRect(Rect, - 1, - 1); 
  end; 
 
  if IsDown then 
  begin 
    FCanvas.Pen.Color := clBtnShadow; 
    FCanvas.Pen.Width := 1; 
    FCanvas.Brush.Color := clBtnFace; 
    FCanvas.Rectangle(Rect.Left, Rect.Top, Rect.Right, Rect.Bottom); 
    InflateRect(Rect, - 1, - 1); 
  end 
  else 
    DrawFrameControl(FCanvas.Handle, Rect, DFC_BUTTON, Flags); 
 
  if IsDown then OffsetRect(Rect, 1, 1); 
 
  OldColor := FCanvas.Brush.Color; 
  FCanvas.Brush.Color := Color; 
  FCanvas.FillRect(Rect); 
  FCanvas.Brush.Color := OldColor; 
  OldMode := SetBkMode(FCanvas.Handle, TRANSPARENT); 
  FCanvas.Font.Color := clBtnText; 
  if IsDisabled then 
    DrawState(FCanvas.Handle, FCanvas.Brush.Handle, nil, Integer(Caption), 0, 
    ((Rect.Right - Rect.Left) - FCanvas.TextWidth(Caption)) div 2, 
    ((Rect.Bottom - Rect.Top) - FCanvas.TextHeight(Caption)) div 2, 
      0, 0, DST_TEXT or DSS_DISABLED) 
  else 
    DrawText(FCanvas.Handle, PChar(Caption), - 1, Rect, 
      DT_SINGLELINE or DT_CENTER or DT_VCENTER); 
  SetBkMode(FCanvas.Handle, OldMode); 
 
  if Assigned(FOnDrawButton) then 
    FOnDrawButton(Self, Rect, TOwnerDrawState(LongRec(State).Lo)); 
 
  if IsFocused and IsDefault then 
  begin 
    Rect := OrgRect; 
    InflateRect(Rect, - 4, - 4); 
    FCanvas.Pen.Color := clWindowFrame; 
    FCanvas.Brush.Color := clBtnFace; 
    DrawFocusRect(FCanvas.Handle, Rect); 
  end; 
end; 
end.

В книгах Калверта, Свана и других авторов можно найти похожий текст. Смысл текста – "Изменить цвет кнопок Button, BitBtn нельзя, т.к. их рисует WINDOWS". Если нельзя, но ОЧЕНЬ НУЖНО, то можно.

Небольшой компонент ColorBtn, дает возможность использовать в кнопках цвет. Кроме того, представлено новое свойство - Frame3D, позволяющее получить более реалистичный вид нажатой кнопки. В отличие от API, при изменении значения свойства Frame3D, не требуется переоткрытие компонента.

Примечание. Кнопку по-прежнему рисует WINDOWS, а раскрашивает ее ColorBtn. Код компонента на 90% повторяет код BitBtn, ничего необычного здесь нет. Чаще заглядывайте в VCL - можно найти много интересного. На рисунке представлены ColorButton и ColorBitBtn.

unit colorbtn;
 
interface
 
uses
 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Buttons;
 
type
 
  TColorBtn = class(TButton)
  private
    FCanvas: TCanvas;
    IsFocused: Boolean;
    F3DFrame: boolean;
    FButtonColor: TColor;
    procedure Set3DFrame(Value: boolean);
    procedure SetButtonColor(Value: TColor);
    procedure CNDrawItem(var Message: TWMDrawItem); message CN_DRAWITEM;
    procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message
      WM_LBUTTONDBLCLK;
    procedure DrawButtonText(const Caption: string; TRC: TRect; State:
      TButtonState; BiDiFlags: Longint);
    procedure CalcuateTextPosition(const Caption: string; var TRC: TRect;
      BiDiFlags: Longint);
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure SetButtonStyle(ADefault: Boolean); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property ButtonColor: TColor read FButtonColor write SetButtonColor default
      clBtnFace;
    property Frame3D: boolean read F3DFrame write Set3DFrame default False;
  end;
 
procedure Register;
 
implementation
 
{ TColorBtn }
 
constructor TColorBtn.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Height := 21;
  FCanvas := TCanvas.Create;
  FButtonColor := clBtnFace;
  F3DFrame := False;
end;
 
destructor TColorBtn.Destroy;
begin
  FCanvas.Free;
  inherited Destroy;
end;
 
procedure TColorBtn.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  with Params do
    Style := Style or BS_OWNERDRAW;
end;
 
procedure TColorBtn.Set3DFrame(Value: boolean);
begin
  if F3DFrame <> Value then
    F3DFrame := Value;
end;
 
procedure TColorBtn.SetButtonColor(Value: TColor);
begin
  if FButtonColor <> Value then
  begin
    FButtonColor := Value;
    Invalidate;
  end;
end;
 
procedure TColorBtn.WMLButtonDblClk(var Message: TWMLButtonDblClk);
begin
  Perform(WM_LBUTTONDOWN, Message.Keys, Longint(Message.Pos));
end;
 
procedure TColorBtn.SetButtonStyle(ADefault: Boolean);
begin
  if IsFocused <> ADefault then
    IsFocused := ADefault;
end;
 
procedure TColorBtn.CNDrawItem(var Message: TWMDrawItem);
var
  RC: TRect;
  Flags: Longint;
  State: TButtonState;
  IsDown, IsDefault: Boolean;
  DrawItemStruct: TDrawItemStruct;
begin
  DrawItemStruct := Message.DrawItemStruct^;
  FCanvas.Handle := DrawItemStruct.HDC;
  RC := ClientRect;
  with DrawItemStruct do
  begin
    IsDown := ItemState and ODS_SELECTED <> 0;
    IsDefault := ItemState and ODS_FOCUS <> 0;
    if not Enabled then
      State := bsDisabled
    else if IsDown then
      State := bsDown
    else
      State := bsUp;
  end;
  Flags := DFCS_BUTTONPUSH or DFCS_ADJUSTRECT;
  if IsDown then
    Flags := Flags or DFCS_PUSHED;
  if DrawItemStruct.ItemState and ODS_DISABLED <> 0 then
    Flags := Flags or DFCS_INACTIVE;
  if IsFocused or IsDefault then
  begin
    FCanvas.Pen.Color := clWindowFrame;
    FCanvas.Pen.Width := 1;
    FCanvas.Brush.Style := bsClear;
    FCanvas.Rectangle(RC.Left, RC.Top, RC.Right, RC.Bottom);
    InflateRect(RC, -1, -1);
  end;
  if IsDown then
  begin
    FCanvas.Pen.Color := clBtnShadow;
    FCanvas.Pen.Width := 1;
    FCanvas.Rectangle(RC.Left, RC.Top, RC.Right, RC.Bottom);
    InflateRect(RC, -1, -1);
    if F3DFrame then
    begin
      FCanvas.Pen.Color := FButtonColor;
      FCanvas.Pen.Width := 1;
      DrawFrameControl(DrawItemStruct.HDC, RC, DFC_BUTTON, Flags);
    end;
  end
  else
    DrawFrameControl(DrawItemStruct.HDC, RC, DFC_BUTTON, Flags);
  FCanvas.Brush.Color := FButtonColor;
  FCanvas.FillRect(RC);
  InflateRect(RC, 1, 1);
  if IsFocused then
  begin
    RC := ClientRect;
    InflateRect(RC, -1, -1);
  end;
  FCanvas.Font := Self.Font;
  if IsDown then
    OffsetRect(RC, 1, 1);
  DrawButtonText(Caption, RC, State, 0);
  if IsFocused and IsDefault then
  begin
    RC := ClientRect;
    InflateRect(RC, -4, -4);
    FCanvas.Pen.Color := clWindowFrame;
    Windows.DrawFocusRect(FCanvas.Handle, RC);
  end;
  FCanvas.Handle := 0;
end;
 
procedure TColorBtn.CalcuateTextPosition(const Caption: string; var TRC: TRect;
  BiDiFlags: Integer);
var
  TB: TRect;
  TS, TP: TPoint;
begin
  with FCanvas do
  begin
    TB := Rect(0, 0, TRC.Right + TRC.Left, TRC.Top + TRC.Bottom);
    DrawText(Handle, PChar(Caption), Length(Caption), TB, DT_CALCRECT or
      BiDiFlags);
    TS := Point(TB.Right - TB.Left, TB.Bottom - TB.Top);
    TP.X := ((TRC.Right - TRC.Left) - TS.X + 1) div 2;
    TP.Y := ((TRC.Bottom - TRC.Top) - TS.Y + 1) div 2;
    OffsetRect(TB, TP.X + TRC.Left, TP.Y + TRC.Top);
    TRC := TB;
  end;
end;
 
procedure TColorBtn.DrawButtonText(const Caption: string; TRC: TRect; State:
  TButtonState; BiDiFlags: Integer);
begin
  with FCanvas do
  begin
    CalcuateTextPosition(Caption, TRC, BiDiFlags);
    Brush.Style := bsClear;
    if State = bsDisabled then
    begin
      OffsetRect(TRC, 1, 1);
      Font.Color := clBtnHighlight;
      DrawText(Handle, PChar(Caption), Length(Caption), TRC,
        DT_CENTER or DT_VCENTER or BiDiFlags);
      OffsetRect(TRC, -1, -1);
      Font.Color := clBtnShadow;
      DrawText(Handle, PChar(Caption), Length(Caption), TRC,
        DT_CENTER or DT_VCENTER or BiDiFlags);
    end
    else
      DrawText(Handle, PChar(Caption), Length(Caption), TRC,
        DT_CENTER or DT_VCENTER or BiDiFlags);
  end;
end;
 
procedure Register;
begin
  RegisterComponents('Controls', [TColorBtn]);
end;
 
end.

Небольшое дополнение. Кнопку по прежнему рисует WINDOWS, а раскрашивает ее ColorBtn. Код компонента на 90% повторяет код BitBtn, ничего необычного здесь нет. Хочется повторить слова Калверта – "Пользуйтесь исходным кодом". Чаще заглядывайте в VCL - можно найти много интересного.

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В книгах Калверта, Свана и других авторов можно найти похожий текст. Смысл текста – "Изменить цвет кнопок Button, BitBtn нельзя, т.к. их рисует WINDOWS". Если нельзя, но ОЧЕНЬ НУЖНО, то можно.

Небольшой компонент ColorBtn, дает возможность использовать в кнопках цвет. Кроме того, представлено новое свойство - Frame3D, позволяющее получить более реалистичный вид нажатой кнопки. В отличие от API, при изменении значения свойства Frame3D, не требуется переоткрытие компонента.

Примечание

Кнопку по-прежнему рисует WINDOWS, а раскрашивает ее ColorBtn. Код компонента на 90% повторяет код BitBtn, ничего необычного здесь нет. Чаще заглядывайте в VCL - можно найти много интересного. На рисунке представлены ColorButton и ColorBitBtn.

unit colorbtn;
 
interface
 
uses
 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Buttons;
 
type
 
  TColorBtn = class(TButton)
  private
    FCanvas: TCanvas;
    IsFocused: Boolean;
    F3DFrame: boolean;
    FButtonColor: TColor;
    procedure Set3DFrame(Value: boolean);
    procedure SetButtonColor(Value: TColor);
    procedure CNDrawItem(var Message: TWMDrawItem); message CN_DRAWITEM;
    procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message
      WM_LBUTTONDBLCLK;
    procedure DrawButtonText(const Caption: string; TRC: TRect; State:
      TButtonState; BiDiFlags: Longint);
    procedure CalcuateTextPosition(const Caption: string; var TRC: TRect;
      BiDiFlags: Longint);
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure SetButtonStyle(ADefault: Boolean); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property ButtonColor: TColor read FButtonColor write SetButtonColor default
      clBtnFace;
    property Frame3D: boolean read F3DFrame write Set3DFrame default False;
  end;
 
procedure Register;
 
implementation
 
{ TColorBtn }
 
constructor TColorBtn.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Height := 21;
  FCanvas := TCanvas.Create;
  FButtonColor := clBtnFace;
  F3DFrame := False;
end;
 
destructor TColorBtn.Destroy;
begin
  FCanvas.Free;
  inherited Destroy;
end;
 
procedure TColorBtn.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  with Params do
    Style := Style or BS_OWNERDRAW;
end;
 
procedure TColorBtn.Set3DFrame(Value: boolean);
begin
  if F3DFrame <> Value then
    F3DFrame := Value;
end;
 
procedure TColorBtn.SetButtonColor(Value: TColor);
begin
  if FButtonColor <> Value then
  begin
    FButtonColor := Value;
    Invalidate;
  end;
end;
 
procedure TColorBtn.WMLButtonDblClk(var Message: TWMLButtonDblClk);
begin
  Perform(WM_LBUTTONDOWN, Message.Keys, Longint(Message.Pos));
end;
 
procedure TColorBtn.SetButtonStyle(ADefault: Boolean);
begin
  if IsFocused <> ADefault then
    IsFocused := ADefault;
end;
 
procedure TColorBtn.CNDrawItem(var Message: TWMDrawItem);
var
  RC: TRect;
  Flags: Longint;
  State: TButtonState;
  IsDown, IsDefault: Boolean;
  DrawItemStruct: TDrawItemStruct;
begin
  DrawItemStruct := Message.DrawItemStruct^;
  FCanvas.Handle := DrawItemStruct.HDC;
  RC := ClientRect;
  with DrawItemStruct do
  begin
    IsDown := ItemState and ODS_SELECTED <> 0;
    IsDefault := ItemState and ODS_FOCUS <> 0;
    if not Enabled then
      State := bsDisabled
    else if IsDown then
      State := bsDown
    else
      State := bsUp;
  end;
  Flags := DFCS_BUTTONPUSH or DFCS_ADJUSTRECT;
  if IsDown then
    Flags := Flags or DFCS_PUSHED;
  if DrawItemStruct.ItemState and ODS_DISABLED <> 0 then
    Flags := Flags or DFCS_INACTIVE;
  if IsFocused or IsDefault then
  begin
    FCanvas.Pen.Color := clWindowFrame;
    FCanvas.Pen.Width := 1;
    FCanvas.Brush.Style := bsClear;
    FCanvas.Rectangle(RC.Left, RC.Top, RC.Right, RC.Bottom);
    InflateRect(RC, -1, -1);
  end;
  if IsDown then
  begin
    FCanvas.Pen.Color := clBtnShadow;
    FCanvas.Pen.Width := 1;
    FCanvas.Rectangle(RC.Left, RC.Top, RC.Right, RC.Bottom);
    InflateRect(RC, -1, -1);
    if F3DFrame then
    begin
      FCanvas.Pen.Color := FButtonColor;
      FCanvas.Pen.Width := 1;
      DrawFrameControl(DrawItemStruct.HDC, RC, DFC_BUTTON, Flags);
    end;
  end
  else
    DrawFrameControl(DrawItemStruct.HDC, RC, DFC_BUTTON, Flags);
  FCanvas.Brush.Color := FButtonColor;
  FCanvas.FillRect(RC);
  InflateRect(RC, 1, 1);
  if IsFocused then
  begin
    RC := ClientRect;
    InflateRect(RC, -1, -1);
  end;
  FCanvas.Font := Self.Font;
  if IsDown then
    OffsetRect(RC, 1, 1);
  DrawButtonText(Caption, RC, State, 0);
  if IsFocused and IsDefault then
  begin
    RC := ClientRect;
    InflateRect(RC, -4, -4);
    FCanvas.Pen.Color := clWindowFrame;
    Windows.DrawFocusRect(FCanvas.Handle, RC);
  end;
  FCanvas.Handle := 0;
end;
 
procedure TColorBtn.CalcuateTextPosition(const Caption: string; var TRC: TRect;
  BiDiFlags: Integer);
var
  TB: TRect;
  TS, TP: TPoint;
begin
  with FCanvas do
  begin
    TB := Rect(0, 0, TRC.Right + TRC.Left, TRC.Top + TRC.Bottom);
    DrawText(Handle, PChar(Caption), Length(Caption), TB, DT_CALCRECT or
      BiDiFlags);
    TS := Point(TB.Right - TB.Left, TB.Bottom - TB.Top);
    TP.X := ((TRC.Right - TRC.Left) - TS.X + 1) div 2;
    TP.Y := ((TRC.Bottom - TRC.Top) - TS.Y + 1) div 2;
    OffsetRect(TB, TP.X + TRC.Left, TP.Y + TRC.Top);
    TRC := TB;
  end;
end;
 
procedure TColorBtn.DrawButtonText(const Caption: string; TRC: TRect; State:
  TButtonState; BiDiFlags: Integer);
begin
  with FCanvas do
  begin
    CalcuateTextPosition(Caption, TRC, BiDiFlags);
    Brush.Style := bsClear;
    if State = bsDisabled then
    begin
      OffsetRect(TRC, 1, 1);
      Font.Color := clBtnHighlight;
      DrawText(Handle, PChar(Caption), Length(Caption), TRC,
        DT_CENTER or DT_VCENTER or BiDiFlags);
      OffsetRect(TRC, -1, -1);
      Font.Color := clBtnShadow;
      DrawText(Handle, PChar(Caption), Length(Caption), TRC,
        DT_CENTER or DT_VCENTER or BiDiFlags);
    end
    else
      DrawText(Handle, PChar(Caption), Length(Caption), TRC,
        DT_CENTER or DT_VCENTER or BiDiFlags);
  end;
end;
 
procedure Register;
begin
  RegisterComponents('Controls', [TColorBtn]);
end;
 
end.
 

Небольшое дополнение. Кнопку по прежнему рисует WINDOWS, а раскрашивает ее ColorBtn. Код компонента на 90% повторяет код BitBtn, ничего необычного здесь нет. Хочется повторить слова Калверта – "Пользуйтесь исходным кодом". Чаще заглядывайте в VCL - можно найти много интересного.

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