How to interactively adding text to scene

Hi,

I need to provide a way to add/modify text to scene interactively, just like Windows' Painter program. Are there any sample codes? It seems to be quite complicated...

I can add text using QGraphicsScene::keyPressEvent together with QGraphicsSimpleTextItem, but I would like to make it work exactly the same way as Windows' Painter program....

Help is very appreciated...

use QGraphicsTextItem

I also add the following code to make it editable:

Code:

---

QVariant MyTextEdit::itemChange(GraphicsItemChange change, const QVariant &value)
{
	switch (change) {
		case ItemSelectedHasChanged:
			if (value.toBool()) { // selected
				setTextInteractionFlags(Qt::TextEditorInteraction);
			} else { // deselected
				setTextInteractionFlags(Qt::NoTextInteraction);
			}				
			break;
		default:
			break;
	}
 
	return QGraphicsTextItem::itemChange(change, value);
}

---

Thanks!

However, the character I enter is taken twice, for instance, I enter "t", it shows up as "tt", I can't seem to find the reason. Here is the code:

Code:

---

class MyScene : public QGraphicsScene
{
 
  void mousePressEvent( QGraphicsSceneMouseEvent *event ) {
 
    currentTextItem = addText ( "" );
    currentTextItem->setPos( event->scenePos() );
    currentTextItem->setTextInteractionFlags( Qt::TextEditorInteraction );
    cursor = currentTextItem->textCursor();
 
  }
 
  void keyPressEvent ( QKeyEvent * event ) {
    if ( currentTextItem ) {
      cursor.clearSelection();
      cursor.movePosition( QTextCursor::NextWord, QTextCursor::KeepAnchor );
      cursor.insertText( event->text() );
    }
 
  } 
 
private:
 
  QGraphicsTextItem*                    currentTextItem;
  QTextCursor                               cursor;
 
};

---

You dont need to handle keypress events. The QGraphicsTextItem class actually embeds QTextEdit into a QGraphicsItem and preserves all its functionality. The only thing you need to do is to change that Qt::TextEditorInteraction flag to make it editable.

Quote:

---

Originally Posted by psih128

You dont need to handle keypress events. The QGraphicsTextItem class actually embeds QTextEdit into a QGraphicsItem and preserves all its functionality. The only thing you need to do is to change that Qt::TextEditorInteraction flag to make it editable.

---

Wow! Thanks!

I spent the entire night digging into the problem, and read QGraphicsTextItem document several times. Not a good documentation in this class....