QTextBlock::setVisible(false) has no effect [unresolved]

[JohannesMunk]

I still couldn't figure this one out:

QTextEdit* te = new QTextEdit();
..
[URL="http://doc.trolltech.com/latest/QTextBlock.html"]QTextBlock[/URL] blk = te->document()->begin();
while (blk.isValid())
{
  bool cond = false;
  if (blk.contains(".."))
   cond = true;
  blk.setVisible(cond);
  blk = blk.next();
}

QTextEdit* te = new QTextEdit();
..
[URL="http://doc.trolltech.com/latest/QTextBlock.html"]QTextBlock[/URL] blk = te->document()->begin();
while (blk.isValid())
{
  bool cond = false;
  if (blk.contains(".."))
   cond = true;
  blk.setVisible(cond);
  blk = blk.next();
}

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Why doesn't QTextBlock::setVisible work? Am I doing something wrong or is the feature just not implemented yet?

http://www.qtcentre.org/forum/f-qt-p...ble-21939.html

Thx in advance!

Johannes

[fullmetalcoder]

have you tried explicitly triggering a relayout (e.g calling QTextDocument::markContentsDirty() )?

[JohannesMunk]

Hi!

Thanks for your quick reply!

#include <QtGui/QApplication>
#include <QtGui>
 
int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
 
  QTextEdit* te = new QTextEdit();
  te->setPlainText("Great [Debug]\nThis is an Error![Error]\nGreat [Debug]\n");
 
  QTextBlock blk = te->document()->firstBlock();
  while (blk.isValid())
  {
    bool cond = true;
    if (blk.text().contains("Debug"))
    {
      cond = false;
      qDebug() << "Setting block invisible";
    }
    blk.setVisible(cond);
    blk = blk.next();
  }
 
  te->document()->markContentsDirty(0,te->document()->end().position());
 
  te->show();
  return a.exec();
}

#include <QtGui/QApplication>
#include <QtGui>

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);

  QTextEdit* te = new QTextEdit();
  te->setPlainText("Great [Debug]\nThis is an Error![Error]\nGreat [Debug]\n");

  QTextBlock blk = te->document()->firstBlock();
  while (blk.isValid())
  {
    bool cond = true;
    if (blk.text().contains("Debug"))
    {
      cond = false;
      qDebug() << "Setting block invisible";
    }
    blk.setVisible(cond);
    blk = blk.next();
  }

  te->document()->markContentsDirty(0,te->document()->end().position());

  te->show();
  return a.exec();
}

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The documentation doesn't state what the markContentsDirty parameters are expressed in.. document.position or blockindices? I guessed document position. Is that right?

However, like this it still doesn't work!

Any further ideas?

Johannes

[cyberpro4]

Hi!
Have you tried to show() the QTextEdit BEFORE the setVisible() on his QTextBlock?

[JohannesMunk]

Hi! Thanks for your reply!

I'm using this code actually to implement a filter, if a block contains a certain word. As the user configures the filter, the QTextEdit is visible way before. Only in this small example its the other way around.

Any further ideas?

Johannes

[cyberpro4]

Ok, this is a small piece of code to "Fold" a certain piece of document in my Code editor.
As you can see I call a setVisible( false ) to the QTextBlock.

void CCodeEditor_FoldArea::mouseReleaseEvent(QMouseEvent * eve){
    QTextBlock thblock = editor->cursorForPosition( eve->pos() ).block().next();
 
    while( thblock.isValid() && !thblock.isVisible() ){
        thblock.setVisible( true );
        thblock = thblock.next();
    }
 
    if( dynamic_cast<CMagnum_TextBlock*>(thblock.userData()) != 0 ){
        CMagnum_TextBlock* mudata = dynamic_cast<CMagnum_TextBlock*>(thblock.userData());
 
        while( thblock.isValid() && thblock.blockNumber() < mudata->foldable() && mudata->foldable() != -1 ){
            thblock.setVisible( false );
            thblock = thblock.next();
        }
    }
 
    editor->viewport()->update();
    editor->lineNumberArea->update();
    editor->m_foldArea->update();
}

void CCodeEditor_FoldArea::mouseReleaseEvent(QMouseEvent * eve){
    QTextBlock thblock = editor->cursorForPosition( eve->pos() ).block().next();

    while( thblock.isValid() && !thblock.isVisible() ){
        thblock.setVisible( true );
        thblock = thblock.next();
    }

    if( dynamic_cast<CMagnum_TextBlock*>(thblock.userData()) != 0 ){
        CMagnum_TextBlock* mudata = dynamic_cast<CMagnum_TextBlock*>(thblock.userData());

        while( thblock.isValid() && thblock.blockNumber() < mudata->foldable() && mudata->foldable() != -1 ){
            thblock.setVisible( false );
            thblock = thblock.next();
        }
    }

    editor->viewport()->update();
    editor->lineNumberArea->update();
    editor->m_foldArea->update();
}

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... at the end I have added editor->viewport->update().
Keep in mind that "editor" is a QPlainTextEdit and viewport() return his QAbstractScrollArea.
Maybe an update can help you

[JohannesMunk]

Aah! With QPlainTextEdit it works! No update required. Doesn't matter where show is called.

Is block.setVisible(false) supposed to not work with QTextEdit?

#include <QtGui/QApplication>
#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
  QPlainTextEdit* te = new QPlainTextEdit();
  te->setPlainText("Great [Debug]\nThis is an Error![Error]\nGreat [Debug]\n");
 
  QTextBlock blk = te->document()->firstBlock();
  while (blk.isValid())
  {
    bool cond = true;
    if (blk.text().contains("Debug"))
    {
      cond = false;
      qDebug() << "Setting block invisible";
    }
    blk.setVisible(cond);
    blk = blk.next();
  }
 
  te->show();
  //te->document()->markContentsDirty(0,te->document()->end().position());
  //te->viewport()->update();
 
    return a.exec();
}

#include <QtGui/QApplication>
#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

  QPlainTextEdit* te = new QPlainTextEdit();
  te->setPlainText("Great [Debug]\nThis is an Error![Error]\nGreat [Debug]\n");

  QTextBlock blk = te->document()->firstBlock();
  while (blk.isValid())
  {
    bool cond = true;
    if (blk.text().contains("Debug"))
    {
      cond = false;
      qDebug() << "Setting block invisible";
    }
    blk.setVisible(cond);
    blk = blk.next();
  }

  te->show();
  //te->document()->markContentsDirty(0,te->document()->end().position());
  //te->viewport()->update();

    return a.exec();
}

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Thx for your time!

Johannes

[cyberpro4]

Happy to be useful
But i'll advise you, In my code editor i have a strange error with setVisibile():when i hide a lot of block, seem that the Vertical scroolbar "scroll" the hide blocks too!
If you find a solution please keep me updated!

Thx
Claudio