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{
fpGUI - Free Pascal Graphical User Interface
Copyright (C) 2000 - 2001 by
Areca Systems GmbH / Sebastian Guenther
Copyright (C) 2006 by Graeme Geldenhuys
member of the fpGUI development team.
Button class declarations
See the file COPYING.fpGUI, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{%mainunit fpgui.pp}
{$IFDEF read_interface}
TGenericButton = class(TWidget)
protected
FEmbedded: Boolean;
procedure Paint(Canvas: TFCanvas); override;
public
constructor Create(AOwner: TComponent); override;
property Embedded: Boolean read FEmbedded write FEmbedded default False;
end;
TCustomButton = class(TGenericButton)
protected
procedure Paint(Canvas: TFCanvas); override;
procedure CalcSizes; override;
public
constructor Create(const pText: string; pOwner: TComponent); overload;
end;
TButton = class(TCustomButton)
published
property CanExpandWidth;
property Enabled;
property Text;
property OnClick;
end;
{
TCustomImageButton = class(TGenericButton)
protected
procedure Paint(Canvas: TGfxCanvas); override;
procedure EvRecalcLayout; override;
end;
TImageButton = class(TCustomImageButton)
published
property Enabled;
property Image;
property OnClick;
end;
}
{$ENDIF read_interface}
{$IFDEF read_implementation}
// ===================================================================
// TGenericButton
// ===================================================================
constructor TGenericButton.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WidgetStyle := WidgetStyle + [wsCaptureMouse, wsClickable, wsOpaque];
end;
procedure TGenericButton.Paint(Canvas: TFCanvas);
var
Flags: TButtonFlags;
begin
if Embedded then
Flags := [btnIsEmbedded]
else
Flags := [];
if (wsClicked in WidgetState) and (wsMouseInside in WidgetState) then
Include(Flags, btnIsPressed);
if (wsHasFocus in WidgetState) and not Embedded then
begin
Include(Flags, btnIsSelected);
if FindForm.IsActive then
Include(Flags, btnHasFocus);
end;
Style.DrawButtonFace(Canvas, Rect(0, 0, BoundsSize.cx, BoundsSize.cy), Flags);
end;
// ===================================================================
// TCustomButton
// ===================================================================
procedure TCustomButton.Paint(Canvas: TFCanvas);
var
Pt: TPoint;
Borders: TRect;
begin
inherited Paint(Canvas);
Borders := Style.GetButtonBorders;
Canvas.IntersectClipRect(Rect(Borders.Left, Borders.Top,
BoundsSize.cx - Borders.Right, BoundsSize.cy - Borders.Bottom));
Canvas.SetColor(Style.GetUIColor(clBtnText));
Pt.x := (BoundsSize.cx - Canvas.TextWidth(Text)) div 2;
Pt.y := (BoundsSize.cy - Canvas.FontCellHeight) div 2;
if (wsClicked in WidgetState) and (wsMouseInside in WidgetState) then
Pt := Pt + Point(1, 1);
Style.DrawText(Canvas, Pt, Text, WidgetState);
end;
procedure TCustomButton.CalcSizes;
var
Borders: TRect;
begin
LAYOUTTRACE('TCustomButton.CalcSizes for %s:%s', [Name, ClassName]);
Borders := Style.GetButtonBorders;
with FindForm.Wnd.Canvas do
begin
FMinSize.cx := Borders.Left + Borders.Right + TextWidth(Text);
if FMinSize.cx < 75 then
FMinSize.cx := 75; // apply default button width
FMinSize.cy := Borders.Left + Borders.Right + FontCellHeight;
end;
FDefSize := FMinSize + gfxbase.Size(20, 2);
end;
constructor TCustomButton.Create(const pText: string; pOwner: TComponent);
begin
Create(pOwner);
Text := pText;
end;
{$ENDIF read_implementation}
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