Syntax highlight selection problem

[s.toonen]

Hey,

I have a problem with my syntax highlighting when the user selects some text. It seems that when keywords are selected, non keywords on the same line disappear and vice versa.

It has something to do with the current line marker, that is created in the overridden paint event of QTextEdit.

Below is an image with no text selected:

http://nicky.xept.nl/dennis/s1.png

Now another image with text selected:

http://nicky.xept.nl/dennis/s2.png

For a small project file containing just the issue follow this link:

http://nicky.xept.nl/dennis/highlight.zip

The code for the paint event

void CCodeWidgetText::paintEvent(QPaintEvent *event)
{
  QTextEdit::ExtraSelection highlight;
  QList<QTextEdit::ExtraSelection> extras;
  QList<QTextCursor*> errorCursors;
  QTextCursor originalCursor = this->textCursor();
 
 
 
  QTextCursor cursor = this->textCursor();
  // SAVE THE SELECTION TO LATER RESTORE IT!
  // int start = cursor.selectionStart();
  // int end = cursor.selectionEnd();  
 
  // CLEARING THE SELECTION SOLVES THE HIGHLIGHTING PROBLEM
  // BUT IS NOT GOOD
  // cursor.clearSelection();
 
  // Mark current line
  highlight.cursor = this->textCursor(); 
  highlight.format.setProperty(QTextFormat::FullWidthSelection, true);
  highlight.format.setBackground(QColor(0,255,0));
  extras << highlight;
 
  // Add extra selections
  this->setExtraSelections(extras);
 
  QTextEdit::paintEvent(event);
 
  // RESTORING THE SELECTION WILL INTRODUCE THE FAULT! (SAVE FIRST ABOVE)
  // cursor.setPosition(start, QTextCursor::MoveAnchor);
  // cursor.setPosition(end, QTextCursor::KeepAnchor);
  // this->setTextCursor(cursor);
}

void CCodeWidgetText::paintEvent(QPaintEvent *event)
{
  QTextEdit::ExtraSelection highlight;
  QList<QTextEdit::ExtraSelection> extras;
  QList<QTextCursor*> errorCursors;
  QTextCursor originalCursor = this->textCursor();
  
  
  
  QTextCursor cursor = this->textCursor();
  // SAVE THE SELECTION TO LATER RESTORE IT!
  // int start = cursor.selectionStart();
  // int end = cursor.selectionEnd();  
  
  // CLEARING THE SELECTION SOLVES THE HIGHLIGHTING PROBLEM
  // BUT IS NOT GOOD
  // cursor.clearSelection();

  // Mark current line
  highlight.cursor = this->textCursor(); 
  highlight.format.setProperty(QTextFormat::FullWidthSelection, true);
  highlight.format.setBackground(QColor(0,255,0));
  extras << highlight;

  // Add extra selections
  this->setExtraSelections(extras);

  QTextEdit::paintEvent(event);
  
  // RESTORING THE SELECTION WILL INTRODUCE THE FAULT! (SAVE FIRST ABOVE)
  // cursor.setPosition(start, QTextCursor::MoveAnchor);
  // cursor.setPosition(end, QTextCursor::KeepAnchor);
  // this->setTextCursor(cursor);
}

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Thanks in advance for any help on this,

Sander