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unit gui_radiobutton;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
fpgfx,
gfxbase,
gfx_widget;
type
TfpgRadioButton = class(TfpgWidget)
private
FBackgroundColor: TfpgColor;
FChecked: boolean;
FFont: TfpgFont;
FGroupIndex: integer;
FOnChange: TNotifyEvent;
FText: string;
FBoxSize: integer;
FIsPressed: boolean;
function GetFontName: string;
procedure SetBackgroundColor(const AValue: TfpgColor);
procedure SetChecked(const AValue: boolean);
procedure SetFontName(const AValue: string);
procedure SetText(const AValue: string);
protected
procedure HandlePaint; override;
procedure HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
procedure HandleLMouseUp(x, y: integer; shiftstate: TShiftState); override;
procedure HandleKeyRelease(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Font: TfpgFont read FFont;
published
property Checked: boolean read FChecked write SetChecked;
property Text: string read FText write SetText;
property FontName: string read GetFontName write SetFontName;
property BackgroundColor: TfpgColor read FBackgroundColor write SetBackgroundColor;
property GroupIndex: integer read FGroupIndex write FGroupIndex;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
end;
function CreateRadioButton(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgRadioButton;
implementation
function CreateRadioButton(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgRadioButton;
begin
Result := TfpgRadioButton.Create(AOwner);
Result.Top := y;
Result.Left := x;
Result.Text := AText;
Result.Width := Result.Font.TextWidth(Result.Text) + 24;
end;
{ TfpgRadioButton }
function TfpgRadioButton.GetFontName: string;
begin
Result := FFont.FontDesc;
end;
procedure TfpgRadioButton.SetBackgroundColor(const AValue: TfpgColor);
begin
if FBackgroundColor = AValue then
Exit; //==>
FBackgroundColor := AValue;
RePaint;
end;
procedure TfpgRadioButton.SetChecked(const AValue: boolean);
var
i: integer;
wg: TfpgWidget;
begin
if FChecked = AValue then
Exit; //==>
FChecked := AValue;
// Clear other radio buttons in the same group
if FChecked and (Parent <> nil) then
begin
for i := 0 to Parent.ComponentCount-1 do
begin
wg := TfpgWidget(Parent.Components[i]);
if (wg <> nil) and (wg <> self) and (wg is TfpgRadioButton) and
(TfpgRadioButton(wg).GroupIndex = GroupIndex) then
begin
TfpgRadioButton(wg).Checked := False;
end;
end; { for }
end; { if }
RePaint;
end;
procedure TfpgRadioButton.SetFontName(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
RePaint;
end;
procedure TfpgRadioButton.SetText(const AValue: string);
begin
if FText = AValue then
Exit; //==>
FText := AValue;
RePaint;
end;
procedure TfpgRadioButton.HandlePaint;
var
r: TfpgRect;
ty: integer;
tx: integer;
img: TfpgImage;
ix: integer;
begin
Canvas.BeginDraw;
inherited HandlePaint;
Canvas.SetColor(FBackgroundColor);
Canvas.FillRectangle(0, 0, Width, Height);
Canvas.SetFont(Font);
if FFocused then
begin
Canvas.SetColor(clText1);
Canvas.SetLineStyle(1, lsDot);
Canvas.DrawRectangle(1, 1, Width-1, Height-1);
end;
Canvas.SetLineStyle(1, lsSolid);
r.SetRect(2, (Height div 2) - (FBoxSize div 2), FBoxSize, FBoxSize);
if r.top < 0 then
r.top := 0;
// calculate which image to paint.
if Enabled then
begin
ix := Ord(FChecked);
if FIsPressed then
Inc(ix, 2);
end
else
ix := (2 + (Ord(FChecked) * 2)) - Ord(FChecked);
// paint the radio button
tx := r.right + 8;
inc(r.left, 2);
inc(r.top, 1);
img := fpgImages.GetImage('sys.radiobuttons');
Canvas.DrawImagePart(r.Left, r.Top, img, ix*12, 0, 12, 12);
ty := (Height div 2) - (Font.Height div 2);
if ty < 0 then
ty := 0;
Canvas.SetTextColor(clText1);
fpgStyle.DrawString(Canvas, tx, ty, FText, Enabled);
Canvas.EndDraw;
end;
procedure TfpgRadioButton.HandleLMouseDown(x, y: integer;
shiftstate: TShiftState);
begin
inherited HandleLMouseDown(x, y, shiftstate);
FIsPressed := True;
Repaint;
end;
procedure TfpgRadioButton.HandleLMouseUp(x, y: integer; shiftstate: TShiftState);
begin
inherited HandleLMouseUp(x, y, shiftstate);
FIsPressed := False;
if not Checked then
begin
Checked := not FChecked;
if Assigned(FOnChange) then
FOnChange(self);
end
else
RePaint;
end;
procedure TfpgRadioButton.HandleKeyRelease(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
begin
if (keycode = keySpace) then
begin
consumed := True;
Checked := not FChecked;
if Assigned(FOnChange) then
FOnChange(self);
end;
if consumed then
Exit; //==>
inherited HandleKeyRelease(keycode, shiftstate, consumed);
end;
constructor TfpgRadioButton.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FText := 'RadioButton';
FFont := fpgGetFont('#Label1');
FHeight := FFont.Height + 4;
FWidth := 120;
FBackgroundColor := clWindowBackground;
FFocusable := True;
FBoxSize := 12;
FChecked := False;
FGroupIndex := 0;
FIsPressed := False;
FOnChange := nil;
end;
destructor TfpgRadioButton.Destroy;
begin
FFont.Free;
inherited Destroy;
end;
end.
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