Make the cursor visible in textEdit (Qt3.3.5)

[jacek]

Check the attachment. It's a quick & dirty solution and needs some additional work, but it should at least get you started.

[vermarajeev]

Check the attachment. It's a quick & dirty solution and needs some additional work, but it should at least get you started.

Hi jacek thank you for your reply,
I went through your solution. I found it helpful.

But I have still one more problem. The solution what you have
provided is for vertical scrollBar but I need the same for horizontal one.

I have done some modification to your code but is unable to calculate the exact points( x and y coordinates)

Is there anything in QTextEdit which can give me the current QPoint
position of the cursor.

Here is the code

Test()
      {
		QSignalMapper *m = new QSignalMapper( this );
		for( int i = 0; i < N; ++i ) 
		{
			_t[i] = new QTextEdit( viewport() );
			_t[i]->resize( WIDTH, HEIGHT );
			_t[i]->setVScrollBarMode( QScrollView::AlwaysOff );
			_t[i]->setHScrollBarMode( QScrollView::AlwaysOff );
			_t[i]->setWrapPolicy ( QTextEdit::AtWordOrDocumentBoundary );
			addChild( _t[i] );
			m->setMapping( _t[i], i );
			connect( _t[i], SIGNAL( textChanged() ), m, SLOT( map() ) );
		}
 
		connect( m, SIGNAL( mapped(int) ), this, SLOT( resize(int) ) );
		updatePositions();
      }
 
   private slots:
      void resize( int i )
      {
		QTextEdit *t = _t[i];
		int w = t->width();
 
		QFontMetrics fm(t->QWidget::font());
		int fontWidth = fm.width(t->text());
		int contentX = QscrollView::visibleWidth();		
 
		if( fontWidth  >= contentX )
		{			
			int para = 0;
			int index = 0;
 
			t->getCursorPosition( &para, &index );
 
			QRect r( t->paragraphRect( para ) );
			int line = t->lineOfChar( para, index );
			int totLines = t->linesOfParagraph( para );			
 
//the problem is here. Here y gives me the correct value but how do I get the correct
//x value. If I have the current QPoint position of the cursor I need not calculate the 
                                          //x and y values and my work becomes easier
			int x = fontWidth;   //fontWidth return the total pixelWidth of the text in current textEdit
			int y = r.top() + ( line * r.height() ) / totLines; 
 
			QPoint pt( x, y );
			pt = t->mapToParent( pt );
			pt = viewportToContents( pt );
			QScrollView::ensureVisible( pt.x(), pt.y() );
		}
      }

Test()
      {
		QSignalMapper *m = new QSignalMapper( this );
		for( int i = 0; i < N; ++i ) 
		{
			_t[i] = new QTextEdit( viewport() );
			_t[i]->resize( WIDTH, HEIGHT );
			_t[i]->setVScrollBarMode( QScrollView::AlwaysOff );
			_t[i]->setHScrollBarMode( QScrollView::AlwaysOff );
			_t[i]->setWrapPolicy ( QTextEdit::AtWordOrDocumentBoundary );
			addChild( _t[i] );
			m->setMapping( _t[i], i );
			connect( _t[i], SIGNAL( textChanged() ), m, SLOT( map() ) );
		}

		connect( m, SIGNAL( mapped(int) ), this, SLOT( resize(int) ) );
		updatePositions();
      }

   private slots:
      void resize( int i )
      {
		QTextEdit *t = _t[i];
		int w = t->width();

		QFontMetrics fm(t->QWidget::font());
		int fontWidth = fm.width(t->text());
		int contentX = QscrollView::visibleWidth();		
			
		if( fontWidth  >= contentX )
		{			
			int para = 0;
			int index = 0;

			t->getCursorPosition( &para, &index );

			QRect r( t->paragraphRect( para ) );
			int line = t->lineOfChar( para, index );
			int totLines = t->linesOfParagraph( para );			

//the problem is here. Here y gives me the correct value but how do I get the correct
//x value. If I have the current QPoint position of the cursor I need not calculate the 
                                          //x and y values and my work becomes easier
			int x = fontWidth;   //fontWidth return the total pixelWidth of the text in current textEdit
			int y = r.top() + ( line * r.height() ) / totLines; 
			
			QPoint pt( x, y );
			pt = t->mapToParent( pt );
			pt = viewportToContents( pt );
			QScrollView::ensureVisible( pt.x(), pt.y() );
		}
      }

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thanks in advance

[jacek]

Is there anything in QTextEdit which can give me the current QPoint position of the cursor.

Yes, there is, but it isn't a part of public API. QTextEdit can give you a pointer to QTextCursor and that cursor object knows its exact position.