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{
fpGUI - Free Pascal GUI Library
Copyright (C) 2006 - 2007 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 basic Label control. Also known as a Caption component.
}
unit gui_label;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_widget;
type
TfpgCustomLabel = class(TfpgWidget)
private
FAutoSize: boolean;
FBackgroundColor: TfpgColor;
FColor: TfpgColor;
function GetFontDesc: string;
procedure SetAutoSize(const AValue: boolean);
procedure SetBackgroundColor(const AValue: TfpgColor);
procedure SetFontDesc(const AValue: string);
procedure SetColor(const AValue: TfpgColor);
procedure SetText(const AValue: string);
procedure ResizeLabel;
protected
FText: string;
FFont: TfpgFont;
procedure HandlePaint; override;
property AutoSize: boolean read FAutoSize write SetAutoSize default False;
property Text: string read FText write SetText;
property FontDesc: string read GetFontDesc write SetFontDesc;
property Color: TfpgColor read FColor write SetColor;
property BackgroundColor: TfpgColor read FBackgroundColor write SetBackgroundColor;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Font: TfpgFont read FFont;
end;
TfpgLabel = class(TfpgCustomLabel)
published
property AutoSize;
property BackgroundColor;
property Color;
property FontDesc;
property Text;
property OnMouseEnter;
property OnMouseExit;
property OnMouseDown;
property OnMouseUp;
property OnMouseMove;
end;
// A convenience function to create a TfpgLabel instance
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgLabel;
implementation
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgLabel;
begin
Result := TfpgLabel.Create(AOwner);
Result.Left := x;
Result.Top := y;
Result.Text := AText;
Result.Width := Result.Font.TextWidth(Result.Text);
end;
{ TfpgCustomLabel }
function TfpgCustomLabel.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
procedure TfpgCustomLabel.SetAutoSize(const AValue: boolean);
begin
if FAutoSize = AValue then
Exit; //==>
FAutoSize := AValue;
if FAutoSize then
begin
ResizeLabel;
RePaint;
end;
end;
procedure TfpgCustomLabel.SetBackgroundColor(const AValue: TfpgColor);
begin
if FBackgroundColor = AValue then
Exit; //==>
FBackgroundColor := AValue;
RePaint;
end;
procedure TfpgCustomLabel.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
if FAutoSize then
ResizeLabel;
RePaint;
end;
procedure TfpgCustomLabel.SetColor(const AValue: TfpgColor);
begin
if FColor = AValue then
Exit;
FColor := AValue;
RePaint;
end;
procedure TfpgCustomLabel.SetText(const AValue: string);
begin
if FText = AValue then
Exit; //==>
FText := AValue;
if FAutoSize then
ResizeLabel;
RePaint;
end;
procedure TfpgCustomLabel.ResizeLabel;
begin
Width := FFont.TextWidth(FText);
Height := FFont.Height;
SetPosition(Left, Top, Width, Height);
end;
constructor TfpgCustomLabel.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FText := 'Label';
FFont := fpgGetFont('#Label1');
FHeight := FFont.Height;
FWidth := 80;
FColor := clText1;
FBackgroundColor := clWindowBackground;
FAutoSize := False;
end;
destructor TfpgCustomLabel.Destroy;
begin
FText := '';
FFont.Free;
inherited Destroy;
end;
procedure TfpgCustomLabel.HandlePaint;
begin
Canvas.BeginDraw;
inherited;
Canvas.Clear(FBackgroundColor);
Canvas.SetFont(Font);
Canvas.SetTextColor(FColor);
fpgStyle.DrawString(Canvas, 0, 0, FText, Enabled);
Canvas.EndDraw;
end;
end.
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