特色按钮
每当用到DELPHI自带的控件都感到少了一点什么，形状也好，颜色也好，变
化的方式也好，都与自已的项目所需要的标准相差了一些，查阅了一些书籍
后发现下面的控件很有可用之处！！！
以下是它的源代码：
unit DsFancyButton;
interface
uses
SysUtils,Windows, Messages, Classes, Graphics, Controls, Forms;
type
TTextStyle = (txNone, txLowered, txRaised, txShadowed);
TShape = (shCapsule, shOval, shRectangle, shRoundRect);
TDsFancyButton = class(TGraphicControl)
private
FButtonColor: TColor;
FIsDown: Boolean;
FFrameColor: TColor;
FFrameWidth: Integer;
FCornerRadius: Integer;
FRgn, MRgn: HRgn;
FShape: TShape;
FTextColor: TColor;
FTextStyle: TTextStyle;
procedure SetButtonColor(Value: TColor);
procedure CMEnabledChanged(var message: TMessage);
message CM_ENABLEDCHANGED;
procedure CMTextChanged(var message: TMessage);
message CM_TEXTCHANGED;
procedure CMDialogChar(var message: TCMDialogChar);
message CM_DIALOGCHAR;
procedure WMSize(var message: TWMSize); message WM_PAINT;
protected
procedure Click; override;
procedure DrawShape;
procedure Paint; override;
procedure SetFrameColor(Value: TColor);
procedure SetFrameWidth(Value: Integer);
procedure SetCornerRadius(Value: Integer);
procedure SetShape(Value: TShape);
procedure SetTextStyle(Value: TTextStyle);
procedure WMLButtonDown(var Message: TWMLButtonDown); message
WM_LBUTTONDOWN;
procedure WMLButtonUp(var Message: TWMLButtonUp); message
WM_LBUTTONUP;
procedure WriteCaption;
public
constructor Create(Aowner: TComponent); override;
destructor Destroy; override;
published
property ButtonColor: TColor
read FButtonColor write SetButtonColor;
property Caption;
property DragCursor;
property DragMode;
property Enabled;
property Font;
property FrameColor: TColor
read FFrameColor write SetFrameColor;
property FrameWidth: Integer
read FFrameWidth write SetFrameWidth;
property ParentFont;
property ParentShowHint;
property PopupMenu;
property CornerRadius: Integer
read FCornerRadius write SetCornerRadius;
property Shape: TShape
read FShape write SetShape default shRoundRect;
property ShowHint;
property TextStyle: TTextStyle
read FTextStyle write SetTExtStyle;
property Visible;
property OnClick; property OnDragDrop;
property OnDragOver; property OnEndDrag;
property OnMouseDown; Property OnMouseUp;
Property OnMouseMove;
end;
procedure Register;
implementation
constructor TDsFancyButton.Create(AOwner: TComponent);
begin
inherited Create(Aowner);
ControlStyle := [csClickEvents, csCaptureMouse, csSetCaption];
Enabled := True;
FButtonColor := clBtnFace;
FIsDown := False;
FFrameColor := clGray;
FFrameWidth := 6;
FCornerRadius := 10;
FRgn := 0;
FShape := shRoundRect;
FTextStyle := txRaised;
Height := 25;
Visible := True;
Width := 97;
end;
destructor TDsFancyButton.Destroy;
begin
DeleteObject(FRgn);
DeleteObject(MRgn);
inherited Destroy;
end;
procedure TDsFancyButton.Paint;
var Dia: integer;
ClrUp, ClrDown: TColor;
begin
Canvas.Brush.Style := bsClear;
if FIsDown then
begin ClrUp := clBtnShadow; ClrDown := clBtnHighlight; end
else
begin ClrUp := clBtnHighlight; ClrDown := clBtnShadow; end;
with Canvas do
begin
case Shape of
shRoundRect:
begin
Dia := 2*CornerRadius;
Mrgn := CreateRoundRectRgn(0, 0, Width, Height, Dia,
Dia);
end;
shCapsule:
begin
if Width < Height then Dia := Width else Dia :=
Height;
Mrgn := CreateRoundRectRgn(0, 0, Width , Height, Dia,
Dia);
end;
shRectangle: MRgn := CreateRectRgn(0, 0, Width - 1, Height
- 1);
shOval: MRgn := CreateEllipticRgn(0, 0, Width, Height);
end;//case
Canvas.Brush.Color := FButtonColor;
FillRgn(Handle, MRgn, Brush.Handle);
Brush.Color :=ClrUp;
FrameRgn(Handle, MRgn, Brush.Handle, 1,1);
OffsetRgn(MRgn, 1, 1);
Brush.Color := ClrDown;
FrameRgn(Handle, MRgn, Brush.Handle, 1, 1);
end;//canvas
DrawShape;
WriteCaption;
end;
procedure TDsFancyButton.DrawShape;
var
FC, Warna: TColor;
R, G, B: Byte;
AwalR, AwalG, AwalB, AkhirR, AkhirG, AkhirB, n, t, Dia: Integer;
begin
if FFrameWidth mod 2=0 then t := FFrameWidth
else t := FFrameWidth + 1;
Warna := ColorToRGB(ButtonColor);
FC := ColorToRGB(FrameColor);
Canvas.Brush.Color := Warna;
AwalR := GetRValue(FC); AkhirR := GetRValue(Warna);
AwalG := GetGValue(FC); AkhirG := GetGValue(Warna);
AwalB := GetBValue(FC); AkhirB := GetBValue(Warna);
FRgn := 0;
with Canvas do
for n := 0 to t - 1 do
begin
R := AwalR + Trunc(Sqrt(t*t - Sqr(t-n))*(AkhirR - AwalR)/t);
G := AwalG + Trunc(Sqrt(t*t - Sqr(t-n))*(AkhirG - AwalG)/t);
B := AwalB + Trunc(Sqrt(t*t - Sqr(t-n))*(AkhirB - AwalB)/t);
Brush.Color := RGB(R, G, B);
Case Shape of
shOval: FRgn := CreateEllipticRgn(1 + n, 1 + n, Width - n,
Height - n);
shRoundRect:
begin
Dia := CornerRadius;
if (Dia - n) >0 then
FRgn :=
CreateRoundRectRgn(1 + n, 1 + n ,Width - n, Height -
n, 2*(Dia - n), 2*(Dia - n))
else FRgn := CreateRectRgn( 1 + n, 1 + n, Width - n - 1,
Height - n - 1);
end;
shCapsule:
begin
if Width < Height then Dia := Width div 2 else Dia :=
Height div 2;
if (Dia - n) > 0 then
FRgn:=
CreateRoundRectRgn(1 + n, 1 + n, Width - n,
Height - n, 2*(Dia - n), 2*(Dia - n))
else FRgn := CreateRectRgn(1 + n, 1 + n ,Width - n -
1, Height - n - 1);
end;
else FRgn := CreateRectRgn(1 + n, 1 + n, Width - n - 1,
Height - n - 1);
end;//case
FrameRgn(Handle, FRgn, Brush.Handle, 1, 1);
end;
end;
procedure TDsFancyButton.WriteCaption;
var
Flags: Word;
BtnL, BtnT, BtnR, BtnB: Integer;
R, TR: TRect;
begin
R := ClientREct; TR := ClientRect;
Canvas.Font := Self.Font;
Canvas.Brush.Style := bsClear;
Flags := DT_CENTER or DT_SINGLELINE;
Canvas.Font := Font;
if FIsDown then FTextColor := FrameColor
else FTextColor := Self.Font.Color;
with canvas do
begin
BtnT := (Height - TextHeight(Caption)) div 2;
BtnB := BtnT + TextHeight(Caption);
BtnL := (Width - TextWidth(Caption)) div 2;
BtnR := BtnL + TextWidth(Caption);
TR := Rect(BtnL, BtnT, BtnR, BtnB);
R := TR;
if ((TextStyle = txLowered) and FIsDown ) or
((TextStyle = txRaised) and not FIsDown) then
begin
Font.Color := clBtnHighLight;
OffsetRect(TR, -1 + 1, -1 + 1);
DrawText(Handle, PChar(Caption), Length(Caption), TR,
Flags);
end
else if ((TextStyle = txLowered) and not FIsDown) or
((TextStyle = txRaised) and FIsDown) then
begin
Font.Color := clBtnHighLight;
OffsetRect(TR, + 2, + 2);
DrawText(Handle, PChar(Caption), Length(Caption), TR,
Flags);
end
else if (TextStyle = txShadowed) and FIsDown then
begin
Font.Color := clBtnShadow;
OffsetREct(TR, 3 + 1, 3 + 1);
DrawText(Handle, PChar(Caption),
Length(Caption), TR, Flags);
end
else if (TextStyle = txShadowed) and not FIsDown
then
begin
Font.Color := clBtnShadow;
OffsetRect(TR, 2 + 1, 2 + 1);
DrawText(Handle, PChar(Caption),
Length(Caption), TR, Flags);
end;
if Enabled then Font.Color := FTextColor//self.Font.Color
else if (TextStyle = txShadowed) and not Enabled then
Font.Color := clBtnFace
else Font.Color := clBtnShadow;
if FIsDown then OffsetRect(R, 1, 1)
else OffsetRect(R, -1, -1);
DrawText(Handle, PChar(Caption), Length(Caption), R, Flags);
end;
end;
procedure TDsFancyButton.SetButtonColor(value: TColor);
begin
if value <> FButtonColor then
begin FButtonColor := value ; Invalidate; end;
end;
procedure TDsFancyButton.WMLButtonDown(var message:
TWMLButtonDown);
begin
if not PtInRegion(MRgn, message.xPos, message.yPos) then Exit;
FIsDown := True;
Paint;
inherited;
end;
procedure TDsFancyButton.WMLButtonUp(var message: TWMLButtonUp);
begin
if not FIsDown then Exit;
FIsDown := False;
paint;
inherited;
end;
procedure TDsFancyButton.SetShape(value: TShape);
begin
if value <> FShape then
begin FShape := value; Invalidate; end;
end;
procedure TDsFancyButton.SetTextStyle(value: TTextStyle);
begin
if value<>FTextStyle then
begin FTextStyle := value; Invalidate; end;
end;
procedure TDsFancyButton.SetFrameColor(value: TColor);
begin
if Value<>FFrameColor then
begin FFrameColor := Value; Invalidate;end;
end;
procedure TDsFancyButton.SetFrameWidth(Value: Integer);
var
w: integer;
begin
if Width<height then w := Width else w := Height;
if Value<>FFrameWidth then FFrameWidth := value;
if FFrameWidth < 4 then FFrameWidth := 4;
if FFrameWidth >(w div 2) then FFrameWidth := (w div 2);
Invalidate;
end;
procedure TDsFancyButton.SetCornerRadius(Value: integer);
var
w: integer;
begin
if Width<Height then w := Width else w := Height;
if value<>FCornerRadius then FCornerRadius := value;
if FCornerRadius<3 then FCornerRadius := 3;
if FCornerRadius>w then FCornerRadius := w;
Invalidate;
end;
procedure TDsFancyButton.CMEnabledChanged(var message: Tmessage);
begin
inherited;
invalidate;
end;
procedure TDsFancyButton.CMTextChanged(var message: TMessage);
begin
Invalidate;
end;
procedure TDsFancyButton.CMDialogChar(var message:TCMDialogChar);
begin
With Message do
if IsAccel (CharCode, Caption) and Enabled then
begin Click; Result := 1 ;end
else inherited;
end;
procedure TDsFancyButton.WMSize(var Message: TWMSize);
begin
inherited;
if width>300 then width := 300;
if Height>300 then Height := 300;
end;
procedure TDsFancyButton.Click;
begin
FIsDown := False;
Invalidate;
inherited Click;
end;
procedure Register;
begin
RegisterComponents('WYM COMPONENT',[TDsFancyButton]);
end;
end.
耿百强。
