Re: [PyQt] faster alternative to QHeaderView's resizeToContents?
On Saturday 09 May 2009 09:28:16 Edwin Marshall wrote: > I have a QTableView that displays the contents of a model with over 3000 > rows, each with 11 columns. I'd like to the original size of these columns > to be no larger than the content within them, but setting their > resizeMode's to QHeaderView.resizeToContents causes the tremendous slow > downs (where originally the data would load in two seconds, using this mode > causes the data to be loaded after about a minute and a half). Is there > some faster alternative? > > I'm thinking of calculating the width by using the length of the largest > item in the column, but that would require me to know how large in pixels > each character is. > > Any suggestions? This can be done reimplementing the sizeHintForColumn method of a QTableView. You should create your own QTableView based class and reimplement this method the "smart" way. See Qt doc for more details on this method. -- David DouardLOGILAB, Paris (France), +33 1 45 32 03 12 Formations Python, Numpy, Debian : http://www.logilab.fr/formations Développement logiciel sur mesure : http://www.logilab.fr/services Informatique scientifique : http://www.logilab.fr/science ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] faster alternative to QHeaderView's resizeToContents?
Are you calling resizeToContents for each item in your table? Sent from my iPhone On May 9, 2009, at 3:28 AM, Edwin Marshall wrote: I have a QTableView that displays the contents of a model with over 3000 rows, each with 11 columns. I'd like to the original size of these columns to be no larger than the content within them, but setting their resizeMode's to QHeaderView.resizeToContents causes the tremendous slow downs (where originally the data would load in two seconds, using this mode causes the data to be loaded after about a minute and a half). Is there some faster alternative? I'm thinking of calculating the width by using the length of the largest item in the column, but that would require me to know how large in pixels each character is. Any suggestions? Mean while, I'm going to stare at the Qt documentation for a couple more hours to see if I find something. Get Free 5GB Email – Check out spam free email with many cool featur es! Visit http://www.inbox.com/email to find out more! ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] faster alternative to QHeaderView's resizeToContents?
Ah, so basically you call fetchMore with a value of 20, then afterwards do a fetchMore with the rest of the data? Seems like a good idea. The only thing I'd be worried about is that filtering woul be inaccurate until the model had a chance to calculate the widths for the rest of it's data. I could disable filtering until all the data is loaded, but I would much rather avoid that. Thanks for the suggestion. --Edwin Marshall > -Original Message- > From: pyqt-requ...@riverbankcomputing.com > Sent: Sat, 9 May 2009 12:00:09 +0100 > To: pyqt@riverbankcomputing.com > Subject: PyQt Digest, Vol 58, Issue 14 > > Send PyQt mailing list submissions to > pyqt@riverbankcomputing.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.riverbankcomputing.com/mailman/listinfo/pyqt > or, via email, send a message with subject or body 'help' to > pyqt-requ...@riverbankcomputing.com > > You can reach the person managing the list at > pyqt-ow...@riverbankcomputing.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of PyQt digest..." > Today's Topics: > >1. Re: faster alternative to QHeaderView's resizeToContents? > (Erik Janssens) > ___ > PyQt mailing list > PyQt@riverbankcomputing.com > http://www.riverbankcomputing.com/mailman/listinfo/pyqt ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] faster alternative to QHeaderView's resizeToContents?
On Sat, May 9, 2009 at 11:33 AM, Glenn Linderman wrote: > On approximately 5/9/2009 12:28 AM, came the following characters from the > keyboard of Edwin Marshall: >> >> I have a QTableView that displays the contents of a model with over 3000 >> rows, each with 11 columns. I'd like to the original size of these columns >> to be no larger than the content within them, but setting their resizeMode's >> to QHeaderView.resizeToContents causes the tremendous slow downs (where >> originally the data would load in two seconds, using this mode causes the >> data to be loaded after about a minute and a half). Is there some faster >> alternative? Hello, I had a similar issue, a big slowdown after resetting my model, and i was thinking the QSortFilterProxyModel is causing this slowdown. Are you sure the resizetocontents is the source of this problem ? Or any of you guys have this similar problem with sortfilterproxy ? My solution was to use treewidget instead, i also used resizetocontents in treewidget and had no slowdowns .. best regards işbaran ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] faster alternative to QHeaderView's resizeToContents?
On approximately 5/9/2009 12:28 AM, came the following characters from the keyboard of Edwin Marshall: I have a QTableView that displays the contents of a model with over 3000 rows, each with 11 columns. I'd like to the original size of these columns to be no larger than the content within them, but setting their resizeMode's to QHeaderView.resizeToContents causes the tremendous slow downs (where originally the data would load in two seconds, using this mode causes the data to be loaded after about a minute and a half). Is there some faster alternative? I'm thinking of calculating the width by using the length of the largest item in the column, but that would require me to know how large in pixels each character is. Any suggestions? Mean while, I'm going to stare at the Qt documentation for a couple more hours to see if I find something. If you have nothing better to try, I'm wondering if unsetting QHeaderView.resizeToContents, then loading the data, and then setting it again, could provide a speedup? If it is successful, let me know. I'm very novice to Qt, and working on a non-Qt project at the moment, or I'd try it for you. -- Glenn -- http://nevcal.com/ === A protocol is complete when there is nothing left to remove. -- Stuart Cheshire, Apple Computer, regarding Zero Configuration Networking ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] faster alternative to QHeaderView's resizeToContents?
I have a QTableView that displays the contents of a model with over 3000 rows, each with 11 columns. I'd like to the original size of these columns to be no larger than the content within them, but setting their resizeMode's to QHeaderView.resizeToContents causes the tremendous slow downs (where originally the data would load in two seconds, using this mode causes the data to be loaded after about a minute and a half). Is there some faster alternative?I'm thinking of calculating the width by using the length of the largest item in the column, but that would require me to know how large in pixels each character is. Any suggestions? Mean while, I'm going to stare at the Qt documentation for a couple more hours to see if I find something. Free 3D Earth Screensaver Watch the Earth right on your desktop! Check it out at www.inbox.com/earth ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
[PyQt] faster alternative to QHeaderView's resizeToContents?
I have a QTableView that displays the contents of a model with over 3000 rows, each with 11 columns. I'd like to the original size of these columns to be no larger than the content within them, but setting their resizeMode's to QHeaderView.resizeToContents causes the tremendous slow downs (where originally the data would load in two seconds, using this mode causes the data to be loaded after about a minute and a half). Is there some faster alternative?I'm thinking of calculating the width by using the length of the largest item in the column, but that would require me to know how large in pixels each character is. Any suggestions? Mean while, I'm going to stare at the Qt documentation for a couple more hours to see if I find something. Get Free 5GB Email – Check out spam free email with many cool features! Visit http://www.inbox.com/email to find out more! ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
