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{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2008 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.
Description:
Defines a CheckBox control. Also known as a Check Button control.
}
unit fpg_checkbox;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
fpg_base,
fpg_main,
fpg_widget;
type
TfpgCheckBox = class(TfpgWidget)
private
FChecked: boolean;
FOnChange: TNotifyEvent;
FText: string;
FFont: TfpgFont;
FBoxSize: integer;
FIsPressed: boolean;
function GetFontDesc: string;
procedure SetChecked(const AValue: boolean);
procedure SetFontDesc(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 BackgroundColor;
property Checked: boolean read FChecked write SetChecked default False;
property FontDesc: string read GetFontDesc write SetFontDesc;
property ParentShowHint;
property ShowHint;
property TabOrder;
property Text: string read FText write SetText;
property TextColor;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnEnter;
property OnExit;
end;
function CreateCheckBox(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgCheckBox;
implementation
function CreateCheckBox(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgCheckBox;
begin
Result := TfpgCheckBox.Create(AOwner);
Result.Top := y;
Result.Left := x;
Result.Text := AText;
Result.Width := Result.Font.TextWidth(Result.Text) + 24;
end;
{ TfpgCheckBox }
procedure TfpgCheckBox.SetChecked(const AValue: boolean);
begin
if FChecked = AValue then
Exit; //==>
FChecked := AValue;
RePaint;
end;
function TfpgCheckBox.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
procedure TfpgCheckBox.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
RePaint;
end;
procedure TfpgCheckBox.SetText(const AValue: string);
begin
if FText = AValue then
Exit; //==>
FText := AValue;
RePaint;
end;
procedure TfpgCheckBox.HandlePaint;
var
r: TfpgRect;
ty: integer;
tx: integer;
ix: integer;
img: TfpgImage;
begin
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-2, Height-2);
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 check (in this case a X)
tx := r.right + 8;
inc(r.left, 2);
inc(r.top, 1);
img := fpgImages.GetImage('sys.checkboxes'); // Do NOT localize
Canvas.DrawImagePart(r.Left, r.Top, img, ix*13, 0, 13, 13);
ty := (Height div 2) - (Font.Height div 2);
if ty < 0 then
ty := 0;
Canvas.SetTextColor(FTextColor);
fpgStyle.DrawString(Canvas, tx, ty, FText, Enabled);
end;
procedure TfpgCheckBox.HandleLMouseDown(x, y: integer; shiftstate: TShiftState);
begin
inherited HandleLMouseDown(x, y, shiftstate);
FIsPressed := True;
Repaint;
end;
procedure TfpgCheckBox.HandleLMouseUp(x, y: integer; shiftstate: TShiftState);
begin
inherited HandleLMouseUp(x, y, shiftstate);
FIsPressed := False;
Checked := not FChecked;
if Assigned(FOnChange) then
FOnChange(self);
end;
procedure TfpgCheckBox.HandleKeyRelease(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
begin
if (keycode = keySpace) or (keycode = keyReturn) or (keycode = keyPEnter) 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 TfpgCheckBox.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FText := 'CheckBox';
FFont := fpgGetFont('#Label1');
FHeight := FFont.Height + 4;
FWidth := 120;
FTextColor := Parent.TextColor;
FBackgroundColor := Parent.BackgroundColor;
FFocusable := True;
FBoxSize := 14;
FChecked := False;
FIsPressed := False;
FOnChange := nil;
end;
destructor TfpgCheckBox.Destroy;
begin
FFont.Free;
inherited Destroy;
end;
end.
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