Qt4.4 QListView paragraph

[bunjee]

Hey there,

I'm using a QListView to display a list of QTextDocument based paragraphs.

Everytime I resize my view I have to call : QAbstractListModel::reset(), to update the paragraph's geometry.

here is my paint delegate content :

painter->save();
 
	QTextDocument document;
	document.setHtml(mText);
	document.setPageSize(QSize(rect.width(), rect.height()));
 
	QAbstractTextDocumentLayout::PaintContext context;
	painter->translate(rect.x(), rect.y());
	document.documentLayout()->draw(painter, context);
 
	painter->restore();

painter->save();

	QTextDocument document;
	document.setHtml(mText);
	document.setPageSize(QSize(rect.width(), rect.height()));

	QAbstractTextDocumentLayout::PaintContext context;
	painter->translate(rect.x(), rect.y());
	document.documentLayout()->draw(painter, context);

	painter->restore();

To copy to clipboard, switch view to plain text mode 

When resizing my widgets : the view goes blank, until resize is completed.
Is there a way to avoid this ?

[bunjee]

// Resizing mode
setResizeMode(QListView::Adjust);

// Resizing mode
setResizeMode(QListView::Adjust);

To copy to clipboard, switch view to plain text mode 

This solved the problem for the blank flickering.

Now I have another problem :
- I have my QListView inside a QSplitter.
- When I do have 2 paragraph items or so in my view, the display is fine.
- When I do have 10 or so paragraph items the display is laggy when I drag the splitter left or right.
- When resizing the window itself : no problem.

Has anyone experienced that ?

[bunjee]

Using my listView I get white flickering.

This happens when I do subsequent reset() operation. Is there a way to avoid QListView blank paiting flickers ?

[wysota]

Yes, don't call reset It's very computation intensive. Try using some other approach. The recent versions of the delegate can signal the view that the size hint of an item might have changed.