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{
fpGUI - Free Pascal GUI Library
RadioButton class declarations
Copyright (C) 2000 - 2006 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
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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