RtfLabel, Version 1.3a (alt)
Hinweis: dies ist nicht die neueste Version!
Datei: DrawRichText.pas
{ DrawRichText.pas Function to draw formatted text (RTF) onto a VCL canvas. Version 1.1 - always find the most current version at http://flocke.vssd.de/prog/code/pascal/rtflabel/ Copyright (C) 2006 Volker Siebert <flocke@vssd.de> All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. } unit DrawRichText; interface {$I Rich3Conf.inc} uses Windows, SysUtils, Graphics; type TRtfTextFormats = (rtfBottom, rtfCalcRect, rtfCenter, rtfLeft, rtfRight, rtfTop, rtfVerticalCenter, rtfWordBreak); TRtfTextFormat = set of TRtfTextFormats; procedure DrawRtfText(Canvas: TCanvas; var Rect: TRect; const Text: string; TextFormat: TRtfTextFormat = []; Zoom: Integer = 100); implementation uses Messages, ActiveX, ComObj, RichEditDll, RichEdit, RichEdit2, TextServ, DelphiTextServ; type TDrawRtfText = class(TTextServices) private FCalcRect: TRect; FCanvas: TCanvas; FCharFormat: TCharFormatW; FFormat: TRtfTextFormat; FRect: TRect; protected // ITextHost interface function TxGetDC: HDC; override; stdcall; function TxReleaseDC(dc: HDC): integer; override; stdcall; function TxGetCharFormat(out ppCF: PCharFormatW): HRESULT; override; stdcall; function TxGetClientRect(out rc: TRect): HRESULT; override; stdcall; function TxGetSysColor(nIndex: Integer): COLORREF; override; stdcall; function TxNotify(iNotify: DWORD; pv: Pointer): HRESULT; override; stdcall; procedure TxViewChange(fUpdate: BOOL); override; stdcall; public constructor Create(Canvas: TCanvas; const Rect: TRect; const Text: string; TextFormat: TRtfTextFormat; Zoom: Integer); destructor Destroy; override; procedure Draw(Really: Boolean = True); property CalcRect: TRect read FCalcRect; end; { TLabelTextServices } constructor TDrawRtfText.Create(Canvas: TCanvas; const Rect: TRect; const Text: string; TextFormat: TRtfTextFormat; Zoom: Integer); var FontName: WideString; stx: TSetTextEx; begin FCanvas := Canvas; FRect := Rect; FFormat := TextFormat; FCalcRect := Rect; FillChar(FCharFormat, SizeOf(FCharFormat), 0); FCharFormat.cbSize := SizeOf(FCharFormat); FCharFormat.dwMask := Integer(CFM_ALL); if fsBold in Canvas.Font.Style then FCharFormat.dwEffects := FCharFormat.dwEffects or CFE_BOLD; if fsItalic in Canvas.Font.Style then FCharFormat.dwEffects := FCharFormat.dwEffects or CFE_ITALIC; if fsUnderline in Canvas.Font.Style then FCharFormat.dwEffects := FCharFormat.dwEffects or CFE_UNDERLINE; FCharFormat.yHeight := 20 * Canvas.Font.Size; FCharFormat.crTextColor := ColorToRGB(Canvas.Font.Color); if Canvas.Font.Color = clWindowText then FCharFormat.dwEffects := FCharFormat.dwEffects or CFE_AUTOCOLOR; FCharFormat.bCharSet := Canvas.Font.Charset; FCharFormat.bPitchAndFamily := DEFAULT_PITCH; FontName := Canvas.Font.Name; LStrCpyW(FCharFormat.szFaceName, PWideChar(FontName)); inherited Create; SendMsg(EM_SETEVENTMASK, 0, ENM_REQUESTRESIZE); if rtfWordbreak in FFormat then PropertyBits := TXTBIT_RICHTEXT or TXTBIT_MULTILINE or TXTBIT_WORDWRAP else PropertyBits := TXTBIT_RICHTEXT or TXTBIT_MULTILINE; if RichEditVersion >= rvRichEdit4 then SendMsg(EM_SETTYPOGRAPHYOPTIONS, TO_ADVANCEDTYPOGRAPHY or TO_ADVANCEDLAYOUT, TO_ADVANCEDTYPOGRAPHY or TO_ADVANCEDLAYOUT); SendMsg(EM_AUTOURLDETECT, 0, 0); stx.flags := ST_DEFAULT; stx.codepage := CP_ACP; SendMsg(EM_SETTEXTEX, LongInt(@stx), LongInt(PChar(Text))); if (Zoom >= 2) and (Zoom <= 6400) then SendMsg(EM_SETZOOM, Zoom, 100); // Force a size notification SendMsg(EM_REQUESTRESIZE, 0, 0); end; destructor TDrawRtfText.Destroy; begin inherited; end; procedure TDrawRtfText.Draw(Really: Boolean = True); var dc: HDC; rc, rc2: TRect; pt, pt2: TPoint; d: Integer; begin dc := FCanvas.Handle; SetWindowOrgEx(dc, 0, 0, @pt); OffsetViewportOrgEx(dc, -pt.x, -pt.y, @pt2); try rc := FRect; rc2 := rc; if Really then begin with FCalcRect do d := Right - Left; if rtfRight in FFormat then rc.Left := rc.Right - d else if rtfCenter in FFormat then rc.Left := (rc.Left + rc.Right - d) div 2; rc.Right := rc.Left + d; with FCalcRect do d := Bottom - Top; if rtfBottom in FFormat then rc.Top := rc.Bottom - d else if rtfVerticalCenter in FFormat then rc.Top := (rc.Top + rc.Bottom - d) div 2; rc.Bottom := rc.Top + d; end else rc2.Bottom := rc2.Top; OleCheck(IServices.TxDraw(DVASPECT_CONTENT, -1, nil, nil, dc, 0, @rc, nil, @rc2, nil, 0, TXTVIEW_ACTIVE)); finally SetViewportOrgEx(dc, pt2.x, pt2.y, nil); SetWindowOrgEx(dc, pt.x, pt.y, nil); end; end; function TDrawRtfText.TxGetCharFormat(out ppCF: PCharFormatW): HRESULT; begin ppCF := @FCharFormat; Result := S_OK; end; function TDrawRtfText.TxGetClientRect(out rc: TRect): HRESULT; begin rc := FRect; Result := S_OK; end; function TDrawRtfText.TxGetDC: HDC; begin Result := FCanvas.Handle; end; function TDrawRtfText.TxGetSysColor(nIndex: Integer): COLORREF; begin if nIndex = COLOR_WINDOW then Result := ColorToRGB(FCanvas.Brush.Color) else if nIndex = COLOR_WINDOWTEXT then Result := ColorToRGB(FCanvas.Font.Color) else Result := GetSysColor(nIndex); end; function TDrawRtfText.TxNotify(iNotify: DWORD; pv: Pointer): HRESULT; begin if iNotify = EN_REQUESTRESIZE then FCalcRect := PReqSize(pv)^.rc; Result := S_OK; end; function TDrawRtfText.TxReleaseDC(dc: HDC): integer; begin Result := 1; end; procedure TDrawRtfText.TxViewChange(fUpdate: BOOL); begin if fUpdate then Draw(False); end; { DrawRtfText } procedure DrawRtfText(Canvas: TCanvas; var Rect: TRect; const Text: string; TextFormat: TRtfTextFormat = []; Zoom: Integer = 100); var Drawer: TDrawRtfText; begin Drawer := TDrawRtfText.Create(Canvas, Rect, Text, TextFormat, Zoom); try if rtfCalcRect in TextFormat then Rect := Drawer.CalcRect else Drawer.Draw; finally Drawer.Free; end; end; end. |