richmemo: added richedit compatible class helpers, started utils unit

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@3752 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/richmemo/richmemohelpers.pas

@@ -0,0 +1,300 @@
+{
+ richmemohelpers.pas
+
+ Author: Dmitry 'skalogryz' Boyarintsev
+
+ *****************************************************************************
+ *                                                                           *
+ *  This file is part of the Lazarus Component Library (LCL)                 *
+ *                                                                           *
+ *  See the file COPYING.modifiedLGPL.txt, included in this distribution,    *
+ *  for details about the copyright.                                         *
+ *                                                                           *
+ *  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.                     *
+ *                                                                           *
+ *****************************************************************************
+}
+unit RichMemoHelpers;
+
+interface
+
+uses
+  RichMemo, Graphics;
+
+{$IFDEF FPC_FULLVERSION >= 20600}
+
+type
+  TRichEditFromRichMemo = class(TObject);
+  TTextAttributes = class(TRichEditFromRichMemo);
+  TParaAttributes = class(TRichEditFromRichMemo);
+
+  TRichEditAlignment = (taLeftJustify, taRightJustify, taCenter, taFullJustify);
+
+  { TRichEditTextAttributes }
+
+  TRichEditTextAttributes = class helper for TTextAttributes
+  private
+    function GetColor: TColor;
+    function GetStyles: TFontStyles;
+    procedure SetColor(AValue: TColor);
+    function GetName: string;
+    procedure SetName(const AValue: string);
+    function GetSize: Integer;
+    procedure SetSize(const ASize: Integer);
+    procedure SetStyles(AValue: TFontStyles);
+  public
+    property Color: TColor read GetColor write SetColor;
+    property Name: string read GetName write SetName;
+    property Size: Integer read GetSize write SetSize;
+    property Style: TFontStyles read GetStyles write SetStyles;
+  end;
+
+  { TRichEditParaAttributes }
+
+  TRichEditParaAttributes = class helper for TParaAttributes
+  private
+    function GetFirstIndent: Integer;
+    function GetLeftIndent: Integer;
+    function GetRightIndent: Integer;
+    function GetTab(Index: Byte): Integer;
+    function GetTabCount: Integer;
+    procedure SetFirstIndent(AValue: Integer);
+    procedure SetLeftIndent(AValue: Integer);
+    procedure SetRightIndent(AValue: Integer);
+    procedure SetTab(Index: Byte; AValue: Integer);
+    procedure SetTabCount(AValue: Integer);
+  protected
+    function GetAlignment: TRichEditAlignment;
+    procedure SetAlignment(const AAlignment: TRichEditAlignment);
+  public
+    property Alignment: TRichEditAlignment read GetAlignment write SetAlignment;
+    property FirstIndent: Integer read GetFirstIndent write SetFirstIndent;
+    property LeftIndent: Integer read GetLeftIndent write SetLeftIndent;
+    property RightIndent: Integer read GetRightIndent write SetRightIndent;
+    property Tab[Index: Byte]: Integer read GetTab write SetTab;
+    property TabCount: Integer read GetTabCount write SetTabCount;
+  end;
+
+  { TRichEditForMemo }
+
+  TRichEditForMemo = class helper for TCustomRichMemo
+  public
+    function SelAttributes: TTextAttributes;
+    function Paragraph: TParaAttributes;
+  end;
+{$ELSE}
+  {$WARNING Class Helpers require FPC 2.6.0 or later, RichEdit compatible methods will not be available }
+{$ENDIF}
+
+implementation
+
+{$IFDEF FPC_FULLVERSION >= 20600}
+
+{ TRichEditTextAttributes }
+
+function TRichEditTextAttributes.GetColor: TColor;
+var
+  prm : TFontParams;
+  m   : TCustomRichMemo;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetTextAttributes(m.SelStart, prm);
+  Result:=prm.Color;
+end;
+
+function TRichEditTextAttributes.GetStyles: TFontStyles;
+var
+  prm : TFontParams;
+  m   : TCustomRichMemo;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetTextAttributes(m.SelStart, prm);
+  Result:=prm.Style;
+end;
+
+function TRichEditTextAttributes.GetName: string;
+var
+  m : TCustomRichMemo;
+  prm: TFontParams;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetTextAttributes(m.SelStart, prm);
+  Result:=prm.Name;
+end;
+
+procedure TRichEditTextAttributes.SetColor(AValue: TColor);
+var
+  m : TCustomRichMemo;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.SetRangeParams( m.SelStart, m.SelLength, [tmm_Color], '', 0, AValue, [], []);
+end;
+
+procedure TRichEditTextAttributes.SetName(const AValue: string);
+var
+  m : TCustomRichMemo;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.SetRangeParams( m.SelStart, m.SelLength, [tmm_Name], AValue, 0, 0, [], []);
+end;
+
+function TRichEditTextAttributes.GetSize: Integer;
+var
+  m  : TCustomRichMemo;
+  prm: TFontParams;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetTextAttributes(m.SelStart, prm);
+  Result:=prm.Size;
+end;
+
+procedure TRichEditTextAttributes.SetSize(const ASize: Integer);
+var
+  m : TCustomRichMemo;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.SetRangeParams( m.SelStart, m.SelLength, [tmm_Size], '', ASize, 0, [], []);
+end;
+
+procedure TRichEditTextAttributes.SetStyles(AValue: TFontStyles);
+var
+  m   : TCustomRichMemo;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.SetRangeParams(m.SelStart, m.SelLength, [tmm_Styles], '', 0, 0, AValue, []);
+end;
+
+{ TRichEditParaAttributes }
+
+const
+  ScreenDPI    = 96;
+  EditDPI      = 72;
+  PtToPixel    = EditDPI / ScreenDPI;
+  PixelToPt    = ScreenDPI / EditDPI;
+
+function TRichEditParaAttributes.GetFirstIndent: Integer;
+var
+  m   : TCustomRichMemo;
+  mt  : TParaMetric;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetParaMetric( m.SelStart, mt);
+  Result := Round((mt.FirstLine - mt.HeadIndent) * PtToPixel);
+end;
+
+function TRichEditParaAttributes.GetLeftIndent: Integer;
+var
+  m   : TCustomRichMemo;
+  mt  : TParaMetric;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetParaMetric( m.SelStart, mt);
+  Result := Round(( mt.HeadIndent) * PtToPixel);
+end;
+
+function TRichEditParaAttributes.GetRightIndent: Integer;
+var
+  m   : TCustomRichMemo;
+  mt  : TParaMetric;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetParaMetric( m.SelStart, mt);
+  Result := Round(( mt.TailIndent) * PtToPixel);
+end;
+
+function TRichEditParaAttributes.GetTab(Index: Byte): Integer;
+begin
+  Result:=0;
+end;
+
+function TRichEditParaAttributes.GetTabCount: Integer;
+begin
+  Result:=0;
+end;
+
+procedure TRichEditParaAttributes.SetFirstIndent(AValue: Integer);
+var
+  m   : TCustomRichMemo;
+  mt  : TParaMetric;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetParaMetric( m.SelStart, mt);
+  mt.FirstLine:=mt.HeadIndent + AValue * PixelToPt;
+  m.SetParaMetric( m.SelStart, m.SelLength, mt);
+end;
+
+procedure TRichEditParaAttributes.SetLeftIndent(AValue: Integer);
+var
+  m   : TCustomRichMemo;
+  mt  : TParaMetric;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetParaMetric( m.SelStart, mt);
+  mt.HeadIndent:=AValue * PixelToPt;
+  m.SetParaMetric( m.SelStart, m.SelLength, mt);
+end;
+
+procedure TRichEditParaAttributes.SetRightIndent(AValue: Integer);
+var
+  m   : TCustomRichMemo;
+  mt  : TParaMetric;
+begin
+  m := TCustomRichMemo(TObject(Self));
+  m.GetParaMetric( m.SelStart, mt);
+  mt.TailIndent:=AValue * PixelToPt;
+  m.SetParaMetric( m.SelStart, m.SelLength, mt);
+end;
+
+procedure TRichEditParaAttributes.SetTab(Index: Byte; AValue: Integer);
+begin
+  //todo
+end;
+
+procedure TRichEditParaAttributes.SetTabCount(AValue: Integer);
+begin
+  //todo
+end;
+
+function TRichEditParaAttributes.GetAlignment: TRichEditAlignment;
+var
+  m  : TCustomRichMemo;
+  al :TParaAlignment;
+begin
+  m:=TCustomRichMemo(TObject(Self));
+  m.GetParaAlignment(m.SelStart, al);
+  case al of
+    paRight:   Result:=taRightJustify;
+    paCenter:  Result:=taCenter;
+    paJustify: Result:=taFullJustify;
+  else
+    Result:=taLeftJustify;
+  end;
+end;
+
+procedure TRichEditParaAttributes.SetAlignment(const AAlignment: TRichEditAlignment);
+var
+  m  : TCustomRichMemo;
+const
+  ReToMemA : array [TRichEditAlignment] of TParaAlignment = (paLeft, paRight, paCenter, paJustify);
+begin
+  m:=TCustomRichMemo(TObject(Self));
+  m.SetParaAlignment(m.SelStart, m.SelLength, ReToMemA[AAlignment]);
+end;
+
+{ TRichEditForMemo }
+
+function TRichEditForMemo.SelAttributes: TTextAttributes;
+begin
+  Result:=TTextAttributes(TObject(Self));
+end;
+
+function TRichEditForMemo.Paragraph: TParaAttributes;
+begin
+  Result:=TParaAttributes(TObject(Self));
+end;
+{$ENDIF}
+
+end.
+