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{
fpGUI - Free Pascal GUI Library
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 basic Label control. Also known as a Caption component.
}
unit gui_label;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_UTF8utils,
gfx_widget;
type
TLayout = (tlTop, tlCenter, tlBottom);
TfpgCustomLabel = class(TfpgWidget)
private
FAutoSize: boolean;
FAlignment: TAlignment;
FLayout: TLayout;
FWrapText: boolean;
FWrappedText: TStringList;
procedure Wrap(MaxLength: integer; AText: string);
procedure SetWrapText(const AValue: boolean);
procedure SetAlignment(const AValue: TAlignment);
procedure SetLayout(const AValue: TLayout);
function GetFontDesc: string;
procedure SetAutoSize(const AValue: boolean);
procedure SetFontDesc(const AValue: string);
procedure SetText(const AValue: string);
procedure ResizeLabel;
protected
FText: string;
FFont: TfpgFont;
procedure HandlePaint; override;
property WrapText: boolean read FWrapText write SetWrapText default False;
property Alignment: TAlignment read FAlignment write SetAlignment default taLeftJustify;
property AutoSize: boolean read FAutoSize write SetAutoSize default False;
property Layout: TLayout read FLayout write SetLayout default tlTop;
property FontDesc: string read GetFontDesc write SetFontDesc;
property Text: string read FText write SetText;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Font: TfpgFont read FFont;
end;
TfpgLabel = class(TfpgCustomLabel)
published
property Alignment;
property AutoSize;
property BackgroundColor;
property FontDesc;
property Layout;
property Text;
property TextColor;
property Width;
property WrapText;
property OnClick;
property OnDoubleClick;
property OnMouseDown;
property OnMouseEnter;
property OnMouseExit;
property OnMouseMove;
property OnMouseUp;
end;
// A convenience function to create a TfpgLabel instance
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string; w: TfpgCoord= 0; h: TfpgCoord= 0;
HAlign: TAlignment= taLeftJustify; VAlign: TLayout= tlTop): TfpgLabel; overload;
implementation
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string; w: TfpgCoord= 0; h: TfpgCoord= 0;
HAlign: TAlignment= taLeftJustify; VAlign: TLayout= tlTop): TfpgLabel; overload;
begin
Result := TfpgLabel.Create(AOwner);
Result.Left := x;
Result.Top := y;
Result.Text := AText;
if w = 0 then
begin
Result.Width := Result.Font.TextWidth(Result.Text) + 5; // 5 is some extra spacing
Result.FAutoSize := True;
end
else
begin
Result.Width := w;
Result.WrapText := True;
end;
if h < Result.Font.Height then
Result.Height:= Result.Font.Height
else
Result.Height:= h;
Result.Alignment:= HAlign;
Result.Layout:= VAlign;
end;
{ TfpgCustomLabel }
procedure TfpgCustomLabel.Wrap(MaxLength: integer; AText: string);
begin
FWrappedText.Clear;
repeat
if UTF8Pos(' ', AText) > 0 then
begin
if Font.TextWidth(UTF8Copy(AText, 1, UTF8Pos(' ', AText))) < MaxLength then
begin
if FWrappedText.Count > 0 then
if (Font.TextWidth(FWrappedText[Pred(FWrappedText.Count)] + ' ' +
UTF8Copy(AText, 1, UTF8Pos(' ', AText)))) < MaxLength then
FWrappedText[Pred(FWrappedText.Count)] := FWrappedText[Pred(FWrappedText.Count)] + ' '
+ UTF8Copy(AText, 1, Pred(UTF8Pos(' ', AText)))
else
FWrappedText.Add(UTF8Copy(AText, 1, Pred(UTF8Pos(' ', AText))))
else
FWrappedText.Add(UTF8Copy(AText, 1, Pred(UTF8Pos(' ', AText))));
AText := UTF8Copy(AText, Succ(UTF8Pos(' ', AText)), UTF8Length(AText) - Pred(UTF8Pos(' ', AText)));
end;
end
else
begin
FWrappedText.Add(AText);
AText:= '';
end;
until UTF8Pos(' ', AText) = 0;
if FWrappedText.Count > 0 then
begin
if (Font.TextWidth(FWrappedText[Pred(FWrappedText.Count)] + ' ' + AText)) < MaxLength then
FWrappedText[Pred(FWrappedText.Count)] := FWrappedText[Pred(FWrappedText.Count)] + ' ' + AText
else
FWrappedText.Add(AText);
end;
if Height < FWrappedText.Count * (Font.Height + 2) then
Height := FWrappedText.Count * (Font.Height + 2);
end;
procedure TfpgCustomLabel.SetWrapText(const AValue: boolean);
begin
FWrapText := AValue;
if FWrapText then
Wrap(Width, FText);
RePaint;
end;
procedure TfpgCustomLabel.SetAlignment(const AValue: TAlignment);
begin
if FAlignment = AValue then
Exit;
FAlignment := AValue;
if FAlignment <> taLeftJustify then
FAutoSize := False;
ResizeLabel;
end;
procedure TfpgCustomLabel.SetLayout(const AValue: TLayout);
begin
if FLayout = AValue then
Exit;
FLayout := AValue;
ResizeLabel;
end;
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
FAlignment := taLeftJustify;
ResizeLabel;
end;
procedure TfpgCustomLabel.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
ResizeLabel;
end;
procedure TfpgCustomLabel.SetText(const AValue: string);
begin
if FText = AValue then
Exit; //==>
FText := AValue;
ResizeLabel;
end;
procedure TfpgCustomLabel.ResizeLabel;
begin
if FAutoSize then
begin
Width := FFont.TextWidth(FText);
end
else if FWrapText then
Wrap(Width, FText);
UpdateWindowPosition;
RePaint;
end;
constructor TfpgCustomLabel.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FText := 'Label';
FFont := fpgGetFont('#Label1');
FHeight := FFont.Height;
FWidth := 80;
FTextColor := Parent.TextColor;
FBackgroundColor := Parent.BackgroundColor;
FAutoSize := False;
FLayout := tlTop;
FAlignment := taLeftJustify;
FWrapText := False;
FWrappedText := TStringList.Create;
end;
destructor TfpgCustomLabel.Destroy;
begin
FText := '';
FFont.Free;
FWrappedText.Free;
inherited Destroy;
end;
procedure TfpgCustomLabel.HandlePaint;
var
i: integer;
r: TfpgRect;
begin
Canvas.BeginDraw;
inherited HandlePaint;
Canvas.ClearClipRect;
r.SetRect(0, 0, Width, Height);
Canvas.Clear(FBackgroundColor);
Canvas.SetFont(Font);
Canvas.SetTextColor(FTextColor);
if WrapText then
begin
if FWrappedText.Count> 0 then
for i:= 0 to Pred(FWrappedText.Count) do
case FAlignment of
taLeftJustify:
case FLayout of
tlTop:
fpgStyle.DrawString(Canvas, 0, (Font.Height + 2) * i, FWrappedText[i], Enabled);
tlBottom:
fpgStyle.DrawString(Canvas, 0,
Height - ((Font.Height + 2) * FWrappedText.Count)+ ((Font.Height + 2) * i),
FWrappedText[i], Enabled);
tlCenter:
fpgStyle.DrawString(Canvas, 0,
((Height - (Font.Height + 2) * FWrappedText.Count) div 2) + ((Font.Height + 2) * i),
FWrappedText[i], Enabled);
end;
taRightJustify:
case FLayout of
tlTop:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FWrappedText[i]),
(Font.Height + 2) * i, FWrappedText[i], Enabled);
tlBottom:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FWrappedText[i]),
Height - ((Font.Height + 2) * FWrappedText.Count)+ ((Font.Height + 2) * i),
FWrappedText[i], Enabled);
tlCenter:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FWrappedText[i]),
((Height - (Font.Height + 2) * FWrappedText.Count) div 2) + ((Font.Height + 2) * i),
FWrappedText[i], Enabled);
end;
taCenter:
case FLayout of
tlTop:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FWrappedText[i])) div 2,
(Font.Height + 2) * i, FWrappedText[i], Enabled);
tlBottom:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FWrappedText[i])) div 2,
Height - ((Font.Height + 2) * FWrappedText.Count)+ ((Font.Height + 2) * i),
FWrappedText[i], Enabled);
tlCenter:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FWrappedText[i])) div 2,
((Height - (Font.Height + 2) * FWrappedText.Count) div 2) + ((Font.Height + 2) * i),
FWrappedText[i], Enabled);
end;
end;
end
else
case FAlignment of
taLeftJustify:
case FLayout of
tlTop:
fpgStyle.DrawString(Canvas, 0, 0, FText, Enabled);
tlBottom:
fpgStyle.DrawString(Canvas, 0, Height - Font.Height, FText, Enabled);
tlCenter:
fpgStyle.DrawString(Canvas, 0, (Height - Font.Height) div 2, FText, Enabled);
end;
taRightJustify:
case FLayout of
tlTop:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FText), 0, FText, Enabled);
tlBottom:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FText), Height - Font.Height, FText, Enabled);
tlCenter:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FText), (Height - Font.Height) div 2, FText, Enabled);
end;
taCenter:
case FLayout of
tlTop:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FText)) div 2, 0, FText, Enabled);
tlBottom:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FText)) div 2, Height - Font.Height, FText, Enabled);
tlCenter:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FText)) div 2, (Height - Font.Height) div 2, FText, Enabled);
end;
end;
Canvas.EndDraw;
end;
end.
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