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Diffstat (limited to 'src/gui/fpg_label.pas')
| -rw-r--r-- | src/gui/fpg_label.pas | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/src/gui/fpg_label.pas b/src/gui/fpg_label.pas new file mode 100644 index 00000000..94a0df4c --- /dev/null +++ b/src/gui/fpg_label.pas @@ -0,0 +1,255 @@ +{ + 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 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 Alignment; + property AutoSize; + property BackgroundColor; + property FontDesc; + property Hint; + property Layout; + property LineSpace; + property ParentShowHint; + property ShowHint; + 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; 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 w = 0 then + begin + Result.Width := Result.Font.TextWidth(Result.Text); + Result.FAutoSize := True; + end + else + Result.Width := w; + 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.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. + |