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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, {$endif}
Classes, SysUtils,
{$IFDEF WindowsDesktop}
Types,
{$endif}
LazSynEditText, SynTextDrawer, LazUTF8, Controls, Graphics,
LazLoggerBase;
type
{ TSynEditStringSystemWidthChars }
TSynEditStringSystemWidthChars = class(TSynEditStringsLinked)
private
FCharWidth: Integer;
FHandleOwner: TCanvas;
fTextDrawer: TheTextDrawer;
protected
{$IFDEF WindowsDesktop} // Do nothing on other OS/ parent handles default
procedure DoGetPhysicalCharWidths(Line: PChar; LineLen, Index: Integer; PWidths: PPhysicalCharWidth); override;
{$endif}
public
constructor Create(ASynStringSource: TSynEditStrings; AHandleOwner: TCanvas);
property HandleOwner: TCanvas read FHandleOwner;
property CharWidth: Integer read FCharWidth write FCharWidth;
property TextDrawer: TheTextDrawer read fTextDrawer write fTextDrawer;
end;
implementation
{$IFDEF WindowsDesktop}
var
LOG_SynSystemWidthChars: PLazLoggerLogGroup;
{$ENDIF}
{ TSynEditStringSystemWidthChars }
constructor TSynEditStringSystemWidthChars.Create(ASynStringSource: TSynEditStrings;
AHandleOwner: TCanvas);
begin
inherited Create(ASynStringSource);
FHandleOwner := AHandleOwner;
end;
{$IFDEF WindowsDesktop}
procedure TSynEditStringSystemWidthChars.DoGetPhysicalCharWidths(Line: PChar; LineLen,
Index: Integer; PWidths: PPhysicalCharWidth);
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;
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;
if TextDrawer= nil then exit;;
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);
//exit;
{$IFDEF WithSynExperimentalCharWidth}
// Need to find fallback font(s), and measure with them too.
TextDrawer.BeginDrawing(FHandleOwner.Handle);
i := GetFontLanguageInfo(textdrawer.StockDC);
if (i and GCP_ERROR) <> 0 then i := 0; //exit;
i := i and FLI_MASK or GCP_GLYPHSHAPE;
i := GetCharacterPlacementW(
textdrawer.StockDC, //FHandleOwner.Handle,
pwidechar(s), length(s), 0, @cpRes, i); //GCP_DIACRITIC + GCP_KASHIDA + GCP_LIGATE);
TextDrawer.EndDrawing;
{$endif}
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..#$FF] then begin
if PWidths^ <> 0 then begin
if (k > 0) and (order[k] = order[k-1]) then begin
debugln(LOG_SynSystemWidthChars, ['TSynEditStringSystemWidthChars for line ', Index, ' set char at ', j, '(', k, ') to be drawn with previous']);
PWidths^ := 0;
end;
if dx[k] > fTextDrawer.CharWidth then
PWidths^ := 2; // assums that is the max size, if font is proportional
end;
inc(k);
end;
inc(PWidths);
inc(Line);
end;
end;
{$endif}
{$IFDEF WindowsDesktop}
initialization
LOG_SynSystemWidthChars := DebugLogger.RegisterLogGroup('SynSystemWidthChars' {$IFDEF SynSystemWidthChars} , True {$ENDIF} );
{$ENDIF}
end.
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