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| unit ColorButton;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls, Buttons;
type
TAlignment =
(alTopLeft, alTopCenter, alTopRight,
alMiddleLeft, alMiddleCenter, alMiddleRight,
alBottomLeft, alBottomCenter, alBottomRight);
TButtonBevel = (bbLowered, bbNone, bbRaised);
TButtonStyles = (bsAutoSize, bsCenter, bsStretch, bsShowFocus, bsShowKey);
TButtonStyle = set of TButtonStyles;
TButtonState = (bsUp, bsDown, bsDisabled);
TColorButton = class(TCustomControl)
private
FAlignment: TAlignment;
FBevelStyle: TButtonBevel;
FBevelSize: Integer;
FColor: TColor;
FPicture: TPicture;
FSpacing: Integer;
FStyle: TButtonStyle;
FFocused: Boolean;
FState: TButtonState;
procedure SetAlignment(Value: TAlignment);
procedure SetBevelStyle(Value: TButtonBevel);
procedure SetBevelSize(Value: Integer);
procedure SetCaption(var Message: TMessage); message CM_TEXTCHANGED;
procedure SetColor(Value: TColor);
procedure SetEnabled(var Message: TMessage); message CM_ENABLEDCHANGED;
procedure SetFocusOff(var Message: TMessage); message CM_LOSTFOCUS;
procedure SetFocusOn(var Message: TMessage); message CM_GOTFOCUS;
procedure SetFont(var Message: TMessage); message CM_FONTCHANGED;
procedure SetPicture(Value: TPicture);
procedure SetSpacing(Value: Integer);
procedure SetStyle(Value: TButtonStyle);
procedure DoEnter; override;
procedure DoExit; override;
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
procedure KeyUp(var Key: Word; Shift: TShiftState); override;
procedure KeyAccel(var Message: TCMDialogChar); message CM_DIALOGCHAR;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Loaded; override;
procedure Paint; override;
published
property Alignment: TAlignment read FAlignment write SetAlignment default alMiddleCenter;
property BevelStyle: TButtonBevel read FBevelStyle write SetBevelStyle default bbRaised;
property BevelSize: Integer read FBevelSize write SetBevelSize default 2;
property Caption;
property Color: TColor read FColor write SetColor default clBtnFace;
property Cursor;
property DragCursor;
property DragMode;
property Enabled;
property Font;
property Height;
property Left;
property Name;
property Picture: TPicture read FPicture write SetPicture;
property Spacing: Integer read FSpacing write SetSpacing default 2;
property Style: TButtonStyle read FStyle write SetStyle default [bsCenter, bsShowFocus];
property Tag;
property TabOrder;
property TabStop;
property Top;
property Width;
property OnClick;
property OnDblClick;
property OnDragDrop;
property OnDragOver;
property OnEndDrag;
property OnEnter;
property OnExit;
property OnKeyDown;
property OnKeyPress;
property OnKeyUp;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnStartDrag;
end;
procedure Register;
function Smallest(X, Y: Integer): Integer;
function Largest(X, Y: Integer): Integer;
function GetHighlightColor(BaseColor: TColor): TColor;
function GetShadowColor(BaseColor: TColor): TColor;
function GetSpeedKey(var Caption: String): Integer;
implementation
procedure Register;
begin
RegisterComponents('Additional', [TColorButton]);
end;
//
// Global procedures and functions
///////////////////////////////////////////////////////////////////////////////
function Smallest(X, Y: Integer): Integer;
begin
if X < Y then Result := X else Result := Y;
end;
function Largest(X, Y: Integer): Integer;
begin
if X > Y then Result := X else Result := Y;
end;
function GetHighlightColor(BaseColor: TColor): TColor;
begin
Result := RGB(
Smallest(GetRValue(ColorToRGB(BaseColor)) + 64, 255),
Smallest(GetGValue(ColorToRGB(BaseColor)) + 64, 255),
Smallest(GetBValue(ColorToRGB(BaseColor)) + 64, 255)
);
end;
function GetShadowColor(BaseColor: TColor): TColor;
begin
Result := RGB(
Largest(GetRValue(ColorToRGB(BaseColor)) - 64, 0),
Largest(GetGValue(ColorToRGB(BaseColor)) - 64, 0),
Largest(GetBValue(ColorToRGB(BaseColor)) - 64, 0)
);
end;
function GetSpeedKey(var Caption: String): Integer;
var
keyPos: Integer;
begin
// Find the speed key location
keyPos := Pos('&', Caption);
// Delete the '&' symbol
Delete(Caption, keyPos, 1);
// Return the location of the speed key
Result := keyPos;
end;
//
// ColorButton procedures and functions
///////////////////////////////////////////////////////////////////////////////
constructor TColorButton.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FAlignment := alMiddleCenter;
FBevelStyle := bbRaised;
FBevelSize := 2;
FColor := clBtnFace;
FPicture := TPicture.Create;
FSpacing := 2;
FStyle := [bsCenter, bsShowFocus, bsShowKey];
FFocused := False;
FState := bsUp;
Width := 75; Height := 25;
Enabled := True;
TabStop := True;
end;
destructor TColorButton.Destroy;
begin
FPicture.Free;
inherited Destroy;
end;
procedure TColorButton.Loaded;
begin
inherited Loaded;
if Enabled then FState := bsUp else FState := bsDisabled;
end;
procedure TColorButton.Paint;
procedure DrawCaption(Offset: Integer);
var
xLoc, yLoc, edgeSize, keyPos: Integer;
newCaption: String;
begin
edgeSize := (FBevelSize + FSpacing);
newCaption := Caption;
keyPos := GetSpeedKey(newCaption);
with inherited Canvas do
begin
// Work out text location
case FAlignment of
alTopLeft:
begin
xLoc := edgeSize + Offset; yLoc := edgeSize + Offset;
end;
alTopCenter:
begin
xLoc := edgeSize + Offset + ((Width - (edgeSize * 2)) - TextWidth(newCaption)) div 2; yLoc := edgeSize + Offset;
end;
alTopRight:
begin
xLoc := Width - edgeSize - TextWidth(newCaption) + Offset; yLoc := edgeSize + Offset;
end;
alMiddleLeft:
begin
xLoc := edgeSize + Offset; yLoc := edgeSize + Offset + ((Height - (edgeSize * 2)) - TextHeight(newCaption)) div 2;
end;
alMiddleCenter:
begin
xLoc := edgeSize + Offset + ((Width - (edgeSize * 2)) - TextWidth(newCaption)) div 2;
yLoc := edgeSize + Offset + ((Height - (edgeSize * 2)) - TextHeight(newCaption)) div 2;
end;
alMiddleRight:
begin
xLoc := Width - edgeSize - TextWidth(newCaption) + Offset;
yLoc := edgeSize + Offset + ((Height - (edgeSize * 2)) - TextHeight(newCaption)) div 2;
end;
alBottomLeft:
begin
xLoc := edgeSize + Offset; yLoc := Height - edgeSize - TextHeight(newCaption) + Offset;
end;
alBottomCenter:
begin
xLoc := edgeSize + Offset + ((Width - (edgeSize * 2)) - TextWidth(newCaption)) div 2;
yLoc := Height - edgeSize - TextHeight(newCaption) + Offset;
end;
alBottomRight:
begin
xLoc := Width - edgeSize - TextWidth(newCaption) + Offset;
yLoc := Height - edgeSize - TextHeight(newCaption) + Offset;
end;
else
// Just in-case...
xLoc := edgeSize + Offset + ((Width - (edgeSize * 2)) - TextWidth(newCaption)) div 2;
yLoc := edgeSize + Offset + ((Height - (edgeSize * 2)) - TextHeight(newCaption)) div 2;
end;
// Draw the text
TextOut(xLoc, yLoc, newCaption);
// Draw the speed key
if ((keyPos > 0) and (bsShowKey in FStyle)) then
begin
// Can't use underscore character - unlikely to be correct width
Pen.Color := Font.Color;
MoveTo(xLoc + (TextWidth(Copy(newCaption, 1, keyPos - 1))), yLoc + (TextHeight('ABC')));
LineTo(xLoc + (TextWidth(Copy(newCaption, 1, keyPos))), yLoc + (TextHeight('ABC')));
end;
end;
end;
var
Client, Picture: TRect;
clHigh, clLow: TColor;
begin
if not Enabled and not (csDesigning in ComponentState) then FState := bsDisabled
else if FState = bsDisabled then FState := bsUp;
if ((not (FPicture.Graphic = nil)) and (bsAutoSize in FStyle)) then
begin
Width := FPicture.Width + (FBevelSize * 2);
Height := FPicture.Height + (FBevelSize * 2);
end;
Client := Bounds(0, 0, Width, Height);
Canvas.Font.Assign(Font);
with inherited Canvas do
begin
// Clear the background
Brush.Color := FColor;
FillRect(Client);
// Draw the button bevel
if not (FBevelStyle = bbNone) then
begin
// Get the bevel colors
if ((FState = bsDown) xor (FBevelStyle = bbLowered)) then
begin
clHigh := GetShadowColor(FColor);
clLow := GetHighlightColor(FColor);
end
else
begin
clHigh := GetHighlightColor(FColor);
clLow := GetShadowColor(FColor);
end;
Frame3D(Canvas, Client, clHigh, clLow, FBevelSize);
end;
// Draw the focus
if (FFocused and (bsShowFocus in FStyle)) and Enabled then
DrawFocusRect(Rect(
Client.Left + FSpacing - 1, Client.Top + FSpacing - 1,
Client.Right - FSpacing + 1, Client.Bottom - FSpacing + 1
));
// Draw the picture
if (FPicture <> nil) then
begin
if (bsStretch in FStyle) then
Picture := Rect(
FBevelSize + FSpacing, FBevelSize + FSpacing, Width - (FBevelSize + FSpacing), Height - (FBevelSize + FSpacing))
else if (bsCenter in FStyle) then
Picture := Bounds(
(Width - FPicture.Width) div 2, (Height - FPicture.Height) div 2,
FPicture.Width, FPicture.Height
)
else
case FAlignment of
alTopLeft, alTopCenter, alTopRight:
Picture := Bounds(
(Width - FPicture.Width) div 2,
((Height - (FBevelSize + FSpacing)) - FPicture.Height),
FPicture.Width, FPicture.Height
);
alMiddleLeft:
Picture := Bounds(
((Width - (FBevelSize + FSpacing)) - FPicture.Width),
(Height - FPicture.Height) div 2,
FPicture.Width, FPicture.Height
);
alMiddleCenter:
Picture := Bounds(
(Width - FPicture.Width) div 2,
(Height - FPicture.Height) div 2,
FPicture.Width, FPicture.Height
);
alMiddleRight:
Picture := Bounds(
(FBevelSize + FSpacing),
(Height - FPicture.Height) div 2,
FPicture.Width, FPicture.Height
);
alBottomLeft, alBottomCenter, alBottomRight:
Picture := Bounds(
(Width - FPicture.Width) div 2,
(FBevelSize + FSpacing),
FPicture.Width, FPicture.Height
);
end;
StretchDraw(Picture, FPicture.Graphic);
end
else
begin
Brush.Color := FColor;
FillRect(Rect(FBevelSize, FBevelSize, Width - FBevelSize, Height - FBevelSize));
end;
// Draw the caption
if (Caption <> '') then
begin
Brush.Style := bsClear;
if ((not Enabled) and (not (csDesigning in ComponentState))) then
begin
Font.Color := GetHighlightColor(FColor); DrawCaption(1);
Font.Color := GetShadowColor(FColor); DrawCaption(0);
end else DrawCaption(0);
end;
end;
end;
procedure TColorButton.DoEnter;
begin
FFocused := True; Repaint;
inherited DoEnter;
end;
procedure TColorButton.DoExit;
begin
FFocused := False; Repaint;
inherited DoExit;
end;
procedure TColorButton.KeyDown(var Key: Word; Shift: TShiftState);
begin
inherited KeyDown(Key, Shift);
if Key = VK_SPACE then
if Enabled then
begin
FState := bsDown;
Repaint;
end;
end;
procedure TColorButton.KeyUp(var Key: Word; Shift: TShiftState);
begin
inherited KeyUp(Key, Shift);
if Key = VK_SPACE then
if Enabled then
begin
FState := bsUp;
Click; Repaint;
end;
if Key = VK_RETURN then if not (FState = bsDisabled) then Click;
end;
procedure TColorButton.KeyAccel(var Message: TCMDialogChar);
begin
with Message do
begin
if IsAccel(CharCode, Caption) and Enabled then
begin
Click;
Result := 1;
end
else inherited;
end;
end;
procedure TColorButton.MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
inherited MouseDown(Button, Shift, X, Y);
if Enabled then
begin
FState := bsDown;
Repaint;
end;
end;
procedure TColorButton.MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
inherited MouseUp(Button, Shift, X, Y);
if Enabled then
begin
FState := bsUp;
Repaint;
end;
end;
procedure TColorButton.SetAlignment(Value: TAlignment);
begin
FAlignment := Value;
Repaint;
end;
procedure TColorButton.SetBevelStyle(Value: TButtonBevel);
begin
FBevelStyle := Value;
Repaint;
end;
procedure TColorButton.SetBevelSize(Value: Integer);
begin
if Value < 1 then Value := 1;
FBevelSize := Value;
Repaint;
end;
procedure TColorButton.SetCaption(var Message: TMessage);
begin
Repaint;
end;
procedure TColorButton.SetColor(Value: TColor);
begin
FColor := Value;
Repaint;
end;
procedure TColorButton.SetEnabled(var Message: TMessage);
begin
inherited;
if Enabled then FState := bsUp else FState := bsDisabled;
Repaint;
end;
procedure TColorButton.SetFocusOff(var Message: TMessage);
begin
inherited;
FFocused := False;
Repaint;
end;
procedure TColorButton.SetFocusOn(var Message: TMessage);
begin
inherited;
FFocused := True;
Repaint;
end;
procedure TColorButton.SetFont(var Message: TMessage);
begin
inherited;
Repaint;
end;
procedure TColorButton.SetPicture(Value: TPicture);
begin
if FPicture <> Value then
begin
FPicture.Assign(Value);
Repaint;
end;
end;
procedure TColorButton.SetSpacing(Value: Integer);
begin
if Value < 0 then Value := 0;
if FSpacing <> Value then
begin
FSpacing := Value;
Repaint;
end;
end;
procedure TColorButton.SetStyle(Value: TButtonStyle);
begin
if FStyle <> Value then
begin
FStyle := Value;
Repaint;
end;
end;
end. |
Changement de couleur du caption d'un TButton
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