Как изменить цвет TButton?

Code:

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.