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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.
RadioButton 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}
{$IFDEF read_interface}
{ TCustomRadioButton }
TCustomRadioButton = class(TWidget)
private
procedure SetChecked(AChecked: Boolean);
protected
FChecked: Boolean;
FLabelPos: TPoint;
procedure Click; override;
procedure Paint(Canvas: TFCanvas); override;
procedure CalcSizes; override;
property Checked: Boolean read FChecked write SetChecked;
public
constructor Create(AOwner: TComponent); override;
constructor Create(const pText: string; pOwner: TComponent); overload;
end;
TRadioButton = class(TCustomRadioButton)
published
property CanExpandWidth;
property CanExpandHeight;
property Enabled;
property Checked;
property Text;
property OnClick;
end;
{$ENDIF read_interface}
{$IFDEF read_implementation}
// ===================================================================
// TCustomRadioButton
// ===================================================================
constructor TCustomRadioButton.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WidgetStyle := WidgetStyle + [wsCaptureMouse, wsClickable];
end;
constructor TCustomRadioButton.Create(const pText: string; pOwner: TComponent);
begin
Create(pOwner);
Text := pText;
end;
procedure TCustomRadioButton.Click;
begin
if not Checked then
SetChecked(True);
inherited Click;
end;
procedure TCustomRadioButton.Paint(Canvas: TFCanvas);
var
FontHeight: Integer;
LabelRect: TRect;
Flags: TCheckboxFlags;
begin
FontHeight := Canvas.FontCellHeight;
LabelRect.Left := FLabelPos.x;
LabelRect.Top := FLabelPos.y + (Height - MinSize.cy) div 2;
LabelRect.Right := LabelRect.Left + Canvas.TextWidth(Text);
LabelRect.Bottom := LabelRect.Top + FontHeight;
Flags := [];
if (wsClicked in WidgetState) and (wsMouseInside in WidgetState) then
Include(Flags, cbIsPressed);
if (wsHasFocus in WidgetState) and FindForm.IsActive then
Include(Flags, cbHasFocus);
if wsEnabled in WidgetState then
Include(Flags, cbIsEnabled);
if Checked then
Include(Flags, cbIsChecked);
Style.DrawRadioButton(Canvas, Rect(0, 0, Width, Height), LabelRect, Flags);
Canvas.SetColor(Style.GetUIColor(clWindowText));
Style.DrawText(Canvas, LabelRect.TopLeft, Text, WidgetState);
end;
procedure TCustomRadioButton.CalcSizes;
begin
with FindForm.Wnd.Canvas do
Style.GetRadioButtonLayout(gfxbase.Size(TextWidth(Text), FontCellHeight),
FMinSize, FLabelPos);
end;
procedure TCustomRadioButton.SetChecked(AChecked: Boolean);
var
i: Integer;
Child: TWidget;
begin
if AChecked <> Checked then
begin
FChecked := AChecked;
Redraw;
if Checked and Assigned(Parent) and
Parent.InheritsFrom(TContainerWidget) then
for i := 0 to TContainerWidget(Parent).ChildCount - 1 do
begin
Child := TContainerWidget(Parent).Children[i];
if (Child <> Self) and Child.InheritsFrom(TCustomRadioButton) then
TCustomRadioButton(Child).Checked := False;
end;
end;
end;
{$ENDIF read_implementation}
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