Delphi SynEdit – HighLigth Parenthesis or Bracket
Bracket Highlighting in Delphi 12.0 Using SynEdit
Delphi 12.0 users have a new tool to improve code readability: a procedure for enabling bracket highlighting in SynEdit. This feature helps developers quickly identify matching parentheses, braces, and other types of brackets within their code, which is essential for navigating complex code structures efficiently.
To implement this feature, developers need to associate a custom procedure with the OnPaintTransient event in SynEdit. This approach was inspired by discussions and solutions shared in a bug report on the SynEdit project page on SourceForge (sourceforge.net/p/synedit/bugs/358/#bc9e), which pointed out the necessity of visually distinguishing matching brackets.
This functionality enhances the coding experience by making it easier to track nested structures, thus reducing errors and improving development speed. For Delphi 12.0 developers looking to enhance their coding environment, integrating bracket highlighting with SynEdit offers a practical solution.
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procedure TfrmSQLAnalizer.SynSQLPaintTransient(Sender: TObject; Canvas: TCanvas; TransientType: TTransientType); var Editor: TSynEdit; OpenChars: array of WideChar;//[0..2] of WideChar=(); CloseChars: array of WideChar;//[0..2] of WideChar=(); Attri: TSynHighlighterAttributes; function IsCharBracket(AChar: WideChar): Boolean; begin case AChar of '{', '[', '(', '<', '}', ']', ')', '>': Result:= True; else Result:= False; end; end; function CharToPixels(P: TBufferCoord): TPoint; begin Result:=Editor.RowColumnToPixels(Editor.BufferToDisplayPos(P)); end; procedure SetCanvasStyle; begin Editor.Canvas.Brush.Style:= bsSolid; //Clear; Editor.Canvas.Font.Assign(Editor.Font); Editor.Canvas.Font.Style:= Attri.Style; if (TransientType = ttAfter) then begin Editor.Canvas.Font.Color:= clRed; // FBracketFG; Editor.Canvas.Brush.Color:= cl3DLight; end else begin Editor.Canvas.Font.Color:= Attri.Foreground; Editor.Canvas.Brush.Color:= Attri.Background; end; if (Editor.Canvas.Font.Color = clNone) then Editor.Canvas.Font.Color:= Editor.Font.Color; if (Editor.Canvas.Brush.Color = clNone) then Editor.Canvas.Brush.Color:= Editor.Color; end; var P : TBufferCoord; Pix: TPoint; D : TDisplayCoord; S : String; I, ArrayLength, start: Integer; TmpCharA, TmpCharB: WideChar; begin try // if Memo1.InReplaceStatus = False then // begin (* if fMain.SyntaxHEnabled = False then exit; if Memo1.Highlighter = nil then exit; if fMain.BracketMatching = False then exit; if TSynEdit(Sender).SelAvail then exit; *) Editor:= TSynEdit(Sender); ArrayLength:= 3; (* if (Editor.Highlighter = SynHTMLSyn1) or (Editor.Highlighter = SynXMLSyn1) then inc(ArrayLength); *) SetLength(OpenChars, ArrayLength); SetLength(CloseChars, ArrayLength); for i:= 0 to ArrayLength - 1 do Case i of 0: begin OpenChars[i]:= '('; CloseChars[i]:= ')'; end; 1: begin OpenChars[i]:= '{'; CloseChars[i]:= '}'; end; 2: begin OpenChars[i]:= '['; CloseChars[i]:= ']'; end; 3: begin OpenChars[i]:= '<'; CloseChars[i]:= '>'; end; end; P:= Editor.CaretXY; D:= Editor.DisplayXY; Start:= Editor.SelStart; if (Start > 0) and (Start <= length(Editor.Text)) then TmpCharA:= Editor.Text[Start] else TmpCharA:= #0; if (Start < length(Editor.Text)) then TmpCharB:= Editor.Text[Start + 1] else TmpCharB:= #0; if not IsCharBracket(TmpCharA) and not IsCharBracket(TmpCharB) then Exit; S:= TmpCharB; if not IsCharBracket(TmpCharB) then begin P.Char:= P.Char - 1; S:= TmpCharA; end; Editor.GetHighlighterAttriAtRowCol(P, S, Attri); if (Editor.Highlighter.SymbolAttribute = Attri) then begin for i:= low(OpenChars) to High(OpenChars) do begin if (S = OpenChars[i]) or (S = CloseChars[i]) then begin Pix:= CharToPixels(P); SetCanvasStyle; Editor.Canvas.TextOut(Pix.X, Pix.Y, S); P := Editor.GetMatchingBracketEx(P); if (P.Char > 0) and (P.Line > 0) then begin Pix:= CharToPixels(P); if Pix.X > Editor.Gutter.RealGutterWidth then begin SetCanvasStyle; if S = OpenChars[i] then Editor.Canvas.TextOut(Pix.X, Pix.Y, CloseChars[i]) else Editor.Canvas.TextOut(Pix.X, Pix.Y, OpenChars[i]); end; //if Pix.X > end; //if (P.Char > 0) end; //if (S = OpenChars[i]) end; //for i:= low(OpenChars) Editor.Canvas.Brush.Style := bsSolid; end; //if (Editor.Highlighter.SymbolAttribute = Attri) except // TODO end; //try end; |
