unit SynEditTextSystemCharWidth; (* WARNING: This unit is highly experimental *) {------------------------------------------------------------------------------- The contents of this file are subject to the Mozilla Public License Version 1.1 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/ Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Alternatively, the contents of this file may be used under the terms of the GNU General Public License Version 2 or later (the "GPL"), in which case the provisions of the GPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of the GPL and not to allow others to use your version of this file under the MPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL. If you do not delete the provisions above, a recipient may use your version of this file under either the MPL or the GPL. -------------------------------------------------------------------------------} {$mode objfpc}{$H+} {$IFDEF Windows} {$IFnDEF WINCE} {$DEFINE WindowsDesktop} {$ENDIF} {$ENDIF} interface uses {$IFDEF WindowsDesktop} windows, {$endif} Classes, SysUtils, LazSynEditText, LazUTF8, Controls, Graphics, LazLoggerBase; type { TSynEditStringBidiChars } { TSynEditStringSystemWidthChars } TSynEditStringSystemWidthChars = class(TSynEditStringsLinked) private FHandleOwner: TCanvas; protected procedure DoGetPhysicalCharWidths(Line: PChar; LineLen, Index: Integer; PWidths: PPhysicalCharWidth); override; public constructor Create(ASynStringSource: TSynEditStrings; AHandleOwner: TCanvas); property HandleOwner: TCanvas read FHandleOwner; end; implementation var LOG_SynSystemWidthChars: PLazLoggerLogGroup; { TSynEditStringSystemWidthChars } constructor TSynEditStringSystemWidthChars.Create(ASynStringSource: TSynEditStrings; AHandleOwner: TCanvas); begin inherited Create(ASynStringSource); FHandleOwner := AHandleOwner; end; procedure TSynEditStringSystemWidthChars.DoGetPhysicalCharWidths(Line: PChar; LineLen, Index: Integer; PWidths: PPhysicalCharWidth); {$IFDEF WindowsDesktop} var //s: UnicodeString;// wideString; i: DWORD; cpRes: TGCPRESULTS; outs: array of widechar; order, dx, caret: array of integer; cclass, glyph: array of word; s: WideString; j, k: Integer; l: SizeUInt; {$endif} begin inherited DoGetPhysicalCharWidths(Line, LineLen, Index, PWidths); if (not IsUtf8) then exit; if (FHandleOwner is TControlCanvas) and (not TWinControl(TControlCanvas(FHandleOwner).Control).HandleAllocated) // SynEdit.HandleAllocated then begin debugln(LOG_SynSystemWidthChars, ['TSynEditStringSystemWidthChars NO HANDLE ']); exit; end; {$IFDEF WindowsDesktop} SetLength(s, LineLen+1); // wide chars of UTF-16 <= bytes of UTF-8 string if ConvertUTF8ToUTF16(PWideChar(S), LineLen+1, Line, LineLen, [toInvalidCharToSymbol], l) <> trNoError then exit; SetLength(s, l - 1); cpRes.lStructSize := sizeof(cpRes); SetLength(outs, Length(s)+1); cpRes.lpOutString := @outs[0]; SetLength(order, Length(s)+1); cpRes.lpOrder := @order[0]; SetLength(dx, Length(s)+1); cpRes.lpDx := @dx[0]; SetLength(caret, Length(s)+1); cpRes.lpCaretPos := @caret[0]; SetLength(cclass, Length(s)+1); cpRes.lpClass := @cclass[0]; SetLength(glyph, Length(s)+1); cpRes.lpGlyphs := @glyph[0]; cpRes.nGlyphs := length(s); i := GetCharacterPlacementW(FHandleOwner.Handle, pwidechar(s), length(s), 0, @cpRes, GCP_DIACRITIC + GCP_KASHIDA + GCP_LIGATE); if i = 0 then begin debugln(LOG_SynSystemWidthChars, ['TSynEditStringSystemWidthChars FAILED for line ', Index]); exit; end; k := 0; // index for order for j := 0 to LineLen-1 do begin if Line^ in [#$00..#$7F, #$C0..#$FF] then begin if PWidths^ <> 0 then begin if (k > 0) and (order[k] = order[k-1]) then begin debugln(LOG_SynSystemWidthChars, ['TSynEditStringSystemWidthChars for line ', Index, ' set char at ', j, '(', k, ') to be drawn with previous']); PWidths^ := 0; end; end; inc(k); end; inc(PWidths); inc(Line); end; {$endif} end; initialization LOG_SynSystemWidthChars := DebugLogger.RegisterLogGroup('SynSystemWidthChars' {$IFDEF SynSystemWidthChars} , True {$ENDIF} ); end.