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{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2010 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 fpg_label;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
fpg_base,
fpg_main,
fpg_widget;
type
TfpgCustomLabel = class(TfpgWidget)
private
FAutoSize: boolean;
FAlignment: TAlignment;
FLayout: TLayout;
FWrapText: boolean;
FLineSpace: integer;
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: TfpgString);
procedure ResizeLabel;
protected
FText: TfpgString;
FFont: TfpgFont;
FTextHeight: integer;
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: TfpgString read FText write SetText;
property LineSpace: integer read FLineSpace write FLineSpace default 2;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Font: TfpgFont read FFont;
property TextHeight: integer read FTextHeight;
end;
TfpgLabel = class(TfpgCustomLabel)
published
property AcceptDrops;
property Align;
property Alignment;
property AutoSize;
property BackgroundColor;
property Enabled;
property FontDesc;
property Height;
property Hint;
property Layout;
property Left;
property LineSpace;
property MaxHeight;
property MaxWidth;
property MinHeight;
property MinWidth;
property Parent;
property ParentShowHint;
property ShowHint;
property Text;
property TextColor;
property Top;
property Width;
property WrapText;
property OnClick;
property OnDragEnter;
property OnDragLeave;
property OnDragDrop;
property OnDragStartDetected;
property OnDoubleClick;
property OnMouseDown;
property OnMouseEnter;
property OnMouseExit;
property OnMouseMove;
property OnMouseUp;
property OnShowHint;
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; ALineSpace: integer= 2): TfpgLabel; overload;
implementation
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string; w: TfpgCoord; h: TfpgCoord;
HAlign: TAlignment; VAlign: TLayout; ALineSpace: integer): TfpgLabel;
begin
Result := TfpgLabel.Create(AOwner);
Result.Left := x;
Result.Top := y;
Result.Text := AText;
Result.LineSpace := ALineSpace;
if h < Result.Font.Height then
Result.Height:= Result.Font.Height
else
Result.Height:= h;
Result.Alignment:= HAlign;
Result.Layout:= VAlign;
if w = 0 then
begin
Result.Width := Result.Font.TextWidth(Result.Text);
Result.AutoSize := True;
end
else
Result.Width := w;
end;
{ TfpgCustomLabel }
procedure TfpgCustomLabel.SetWrapText(const AValue: boolean);
begin
if FWrapText <> AValue then
begin
FWrapText := AValue;
ResizeLabel;
end;
end;
procedure TfpgCustomLabel.SetAlignment(const AValue: TAlignment);
begin
if FAlignment <> AValue then
begin
FAlignment := AValue;
ResizeLabel;
end;
end;
procedure TfpgCustomLabel.SetLayout(const AValue: TLayout);
begin
if FLayout <> AValue then
begin
FLayout := AValue;
ResizeLabel;
end;
end;
function TfpgCustomLabel.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
procedure TfpgCustomLabel.SetAutoSize(const AValue: boolean);
begin
if FAutoSize <> AValue then
begin
FAutoSize := AValue;
ResizeLabel;
end;
end;
procedure TfpgCustomLabel.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
ResizeLabel;
end;
procedure TfpgCustomLabel.SetText(const AValue: TfpgString);
begin
if FText <> AValue then
begin
FText := AValue;
ResizeLabel;
end;
end;
procedure TfpgCustomLabel.ResizeLabel;
begin
if FAutoSize and not FWrapText then
Width := FFont.TextWidth(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;
FLineSpace := 2;
end;
destructor TfpgCustomLabel.Destroy;
begin
FText := '';
FFont.Free;
inherited Destroy;
end;
procedure TfpgCustomLabel.HandlePaint;
var
r: TfpgRect;
lTxtFlags: TFTextFlags;
begin
inherited HandlePaint;
Canvas.ClearClipRect;
r.SetRect(0, 0, Width, Height);
Canvas.Clear(FBackgroundColor);
Canvas.SetFont(Font);
if Enabled then
Canvas.SetTextColor(FTextColor)
else
Canvas.SetTextColor(clShadow1);
lTxtFlags:= [];
if not Enabled then
Include(lTxtFlags, txtDisabled);
if FWrapText then
Include(lTxtFlags, txtWrap);
case FAlignment of
taLeftJustify:
Include(lTxtFlags, txtLeft);
taRightJustify:
Include(lTxtFlags, txtRight);
taCenter:
Include(lTxtFlags, txtHCenter);
end;
case FLayout of
tlTop:
Include(lTxtFlags, txtTop);
tlBottom:
Include(lTxtFlags, txtBottom);
tlCenter:
Include(lTxtFlags, txtVCenter);
end;
FTextHeight := Canvas.DrawText(0, 0, Width, Height, FText, lTxtFlags);
end;
end.
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