Highlighting partial text inside QTableView
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I got the QTextDocument to work inside my Item Delegate,
but somehow the QSyntaxHighlighter doesnt work till I call a rehighlight on it.. like this ->@QTextDocument *doc = new QTextDocument;
doc->setPlainText(text);
doc->adjustSize();FilterSyntaxHighlighter* highlighter = new FilterSyntaxHighlighter(regExp, doc); highlighter->rehighlight(); QAbstractTextDocumentLayout :: PaintContext context; doc->setPageSize(opt.rect.size()); painter->setClipRect(opt.rect); painter->translate( opt.rect.x(), opt.rect.y() ); doc->documentLayout()->draw(painter,context);@I guess I am missing some minor thing here.
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We're (with "Bobs":http://developer.qt.nokia.com/member/711) using some internal code here for a practically same purpose. After a few discussions we published it (and a little sample application) on "gitorious":http://gitorious.org/modelviewutils/modelviewutils.
!http://img192.imageshack.us/img192/1912/modelviewutils.png(modelviewutils.png)!
We've inherited subclass from QItemDelegate (it's named MarkerItemDelegate) and used an extended QSortFilterProxyModel named GenericSortFilterModel to give a sorting regexp to the delegate. Note that MarkerItemDelegate is based on Qt Creator internal class with the same name, so you're free to use it if you accept the terms of it's LGPL license.
Also note that MarkerItemDelegate works incorrectly with a multi-line fields in a model when a selection breaks into a two lines.
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Be aware that the standard delegate on all item views is "QStyledItemDelegate":http://doc.qt.nokia.com/stable/qstyleditemdelegate.html as of Qt 4.4, not "QItemDelegate":http://doc.qt.nokia.com/stable/qitemdelegate.html. See the API docs for the "differences":http://doc.qt.nokia.com/stable/qstyleditemdelegate.html#qstyleditemdelegate-vs-qitemdelegate
Althought this very likely to not solve your actual problem, it is strongly advised to use QStyledItemDelegate as your base class.
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Well, I agree that it's not a quite perfect solution, but it have one definite advantage: it works! :)
Maybe we'll polish and rewrite this component later, but at the moment I don't really have a free time to do it. Just hope that this little sample will be useful for somebody (maybe a topicstarter) here.
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Thanks bobs and badlogin for sharing your example.
It is definitely useful.I tried it and it works fine with few minor problems, I found with your example are the highlight doesnt move when row is resized, and on selection the cell doesnt show the highlight
!http://img231.imageshack.us/img231/3166/filter2.png(Filter Example 1)!
I achieved my result using QTextDocument with QSyntaxHighlighter as previously mentioned, but I'm not sure if this it is an efficient one.
Anyways coding it was pretty simple, and it dint have the many issues like resizing etc worked fine, and with QSyntaxHighlighter it is easier to set various styles compared to painting everything ourselves. Preview ->!http://img441.imageshack.us/img441/5984/filterh.png(Filter Example 2)!
If you guys wanna have a look at it - let me know, I will share my code.
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[quote author="Volker" date="1295972488"]Be aware that the standard delegate on all item views is "QStyledItemDelegate":http://doc.qt.nokia.com/stable/qstyleditemdelegate.html as of Qt 4.4, not "QItemDelegate":http://doc.qt.nokia.com/stable/qitemdelegate.html. See the API docs for the "differences":http://doc.qt.nokia.com/stable/qstyleditemdelegate.html#qstyleditemdelegate-vs-qitemdelegate
Althought this very likely to not solve your actual problem, it is strongly advised to use QStyledItemDelegate as your base class.[/quote]
Yes Volker I checked that too, my implementation also uses QItemDelegate now :(
I am new to C++ and Qt, and I started looking for similar solutions in Qt code, and found something similar to what I wanted in Qt Creator and achieved my result using QItemDelegate as they have used in Qt Creator's - Search result window.
Access to functions like doLayout, QItemDelegate::drawFocus, QItemDelegate::drawBackground, etc., are easily available in QItemDelegate which I used in paint, and I could not find the alternates for this in QStyledItemDelegate. Will try to move my code to QStyledItemDelegate too. -
[quote author="Gerolf" date="1295977979"]Ashwin Das
perhaps you could make a wiki page for that? perhaps in developement, otherweis in code snippets...[/quote]
Sure will do,
But as of now, my example uses QItemDelegate and not QStyledItemDelegate.
As it is not recommended to use QItemDelegate, should I create the wiki now? or sometime later when I get it working with QStyledItemDelegate? -
Hi
I implemented highlighting using this way ( dynamically created QTextDocument ) for QListView .
Generally it works. But I have an issue with ItemDelegate::sizeHint () : if it returns a height below 20 then text in the lines disappear.Could you please advise something ?