[Interest] QSortFilterProxyModel filtering on QFileSystemModel
Hi I've hitten a 'fun' corner where I found a surprising but documented feature of QFileSystemModel and discovered how it interacted with certain QSortFilterProxyModel configurations and QTreeView interactions Assume the following: Create a QSortFilterProxyModel with setRecursiveFilteringEnabled(true); create a folder hierachy under /home/yourusername/somefolder: folder1 \-- foo folder2 \-- bar set the the filesystem model as source on the proxy model set the the root path on the filesystemmodel to /home/yourusername/somefolder set the treeview root to the root item mapped to the proxymodel Try set 'foo' as a filter in the QSFPM and see just folder1 \-- foo in the view Try set 'home' as a filter in the QSFPM and see the full view expanded. This seems to be because 'home' matches the 'home' in the path (because setRootPath on QFileSystemModel doesn't change the model root node, but just where the file gatherer is running; and also why you need to both set the root path on the QFileSystemModel and the mapped index as the root on the QTreeView) Does anyone know a workaround or something else I have missed ? I guess a SubtreeFilteringProxyModel could be what I'm looking for, but didn't directly find it. Any pointers anyone? /Sune ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] QSortFilterProxyModel issue
I managed to trim down this to a small testbed that reproduces the issue in case anyone could have a look. We ought to find out whether it is a Qt bug or a bug in my code: https://github.com/lpapp/examples/blob/main/qt-simple-hotkey-editor/hotkeyEditorWidget.cpp On Sat, May 28, 2022 at 4:32 PM Laszlo Papp wrote: > Hi, > > I have authored an example keyboard shortcuts editor application. The > source code is available on my github repository. > > It has this auto-expansion issue for the first group for some reason. When > I am trying to get to action in e.g. Context1 -> Category1 -> then any > action to select, the first Context0 group expands. If I remove the > QSortFilterProxyModel use, it does not do that. > > Here is a visual gif representation of the issue: > > https://imgur.com/a/rxdYmZp > > Can anyone spot the issue with my code? The code is available here: > > > https://github.com/lpapp/examples/blob/main/qt-hotkey-editor/hotkeyEditorWidget.cpp > > Thank you in advance. > > Kind regards, > László > ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
[Interest] QSortFilterProxyModel issue
Hi, I have authored an example keyboard shortcuts editor application. The source code is available on my github repository. It has this auto-expansion issue for the first group for some reason. When I am trying to get to action in e.g. Context1 -> Category1 -> then any action to select, the first Context0 group expands. If I remove the QSortFilterProxyModel use, it does not do that. Here is a visual gif representation of the issue: https://imgur.com/a/rxdYmZp Can anyone spot the issue with my code? The code is available here: https://github.com/lpapp/examples/blob/main/qt-hotkey-editor/hotkeyEditorWidget.cpp Thank you in advance. Kind regards, László ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] QSortFilterProxyModel
Il 19/02/19 16:48, Christopher Probst ha scritto: Thank you Nils. My question may have have been incomplete. I am looking to filter the model through a regular expression on data contained in the header. I am not sure the method you suggested is the appropriate one. But it will certainly help. Something that would ideally look like void setFilterKeyColumn(int column), where I have a column number that represents the vertical header. I'm not 100% sure I understood what you need, but here's an idea. Make your model return the header data you want to filter upon as some "hidden" role of come column. Then put a QSFPM on top, filtering on that column and that hidden role. If you can't modify the source model, place a QIdentityProxyModel in the middle with a custom data() override. HTH, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (France) S.A.S., a KDAB Group company Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com KDAB - The Qt, C++ and OpenGL Experts smime.p7s Description: Firma crittografica S/MIME ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] QSortFilterProxyModel
Thank you Nils. My question may have have been incomplete. I am looking to filter the model through a regular expression on data contained in the header. I am not sure the method you suggested is the appropriate one. But it will certainly help. Something that would ideally look like void setFilterKeyColumn(int column), where I have a column number that represents the vertical header. Thanks, Christopher On Tue, 19 Feb 2019 at 01:40, Nils Jeisecke wrote: > Hi, > > Am 18.02.2019 um 16:49 hat Christopher Probst geschrieben: > > Does anybody know if it Is possible to use QSortFilterProxy to filter > over > > data that is in vertical the header? > you mean QSortFilterProxyModel::filterAcceptsColumn? > > Nils > ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] QSortFilterProxyModel
Hi, Am 18.02.2019 um 16:49 hat Christopher Probst geschrieben: > Does anybody know if it Is possible to use QSortFilterProxy to filter over > data that is in vertical the header? you mean QSortFilterProxyModel::filterAcceptsColumn? Nils ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
[Interest] QSortFilterProxyModel
Hello Everybody. Does anybody know if it Is possible to use QSortFilterProxy to filter over data that is in vertical the header? Thanks, Christopher ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] QSortFilterProxyModel and Exceptions
William, Thanks for your reply and for your tip. Got it! Best regards, Nuno > On 14 Nov 2017, at 11:05, william.croc...@analog.com wrote: > > On 11/14/2017 05:46 AM, Nuno Santos wrote: >> Hi, >> >> I’m using QSortFilterProxyModel to sort a data model ascending and >> descending. >> >> I wanted to create an exception to make a single item always appear at the >> beginning of the filtered model, bypassing the sort. >> >> Does anyone knows if this is possible? >> > > Build that special case into your lessThan() function. > >> Thx! >> >> Regards, >> >> Nuno >> ___ >> Interest mailing list >> Interest@qt-project.org >> http://lists.qt-project.org/mailman/listinfo/interest >> > > ___ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QSortFilterProxyModel and Exceptions
On 11/14/2017 05:46 AM, Nuno Santos wrote: Hi, I’m using QSortFilterProxyModel to sort a data model ascending and descending. I wanted to create an exception to make a single item always appear at the beginning of the filtered model, bypassing the sort. Does anyone knows if this is possible? Build that special case into your lessThan() function. Thx! Regards, Nuno ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] QSortFilterProxyModel and Exceptions
Hi, I’m using QSortFilterProxyModel to sort a data model ascending and descending. I wanted to create an exception to make a single item always appear at the beginning of the filtered model, bypassing the sort. Does anyone knows if this is possible? Thx! Regards, Nuno ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] QSortFilterProxyModel and lazily populated treeviews
Hello, I have implemented a lazily populated treeview by subclassing QAbstractItemModel. The implementation looks something like: https://gist.github.com/gnufied/db9c4d805e2bb24d8c23 (I am not pasting code inline, so as to mess with messaging) It is basically a tree representation of hierarchical data stored in table. Now, I want users to be able to sort the rows based on columns. Where columns are, count or reference count. These values are basically integers. The implementation on its own works, until I throw in QSortFilterProxyModel and I start to get lots of empty rows in the view. The hard problem is, this tends to happen only when I have lots of rows (like thousands or so). The code for implementing sorting proxy is: rootItem = RBKit::SqlConnectionPool::getInstance()-rootOfSnapshot(snapShotVersion); model = new RBKit::HeapDataModel(rootItem, this); proxyModel = new SortObjectProxyModel(this); proxyModel-setSourceModel(model); ui-treeView-setModel(proxyModel); ui-treeView-setSortingEnabled(true); I have subclassed QSortFilterProxyModel class and subclass implementation is really simple: https://gist.github.com/gnufied/115f1a4fae3538534511 The documentation does say - This simple proxying mechanism may need to be overridden for source models with more complex behavior; for example, if the source model provides a custom hasChildren qthelp://org.qt-project.qtcore.531/qtcore/qsortfilterproxymodel.html#hasChildren() implementation, you should also provide one in the proxy model. But beyond that, I am not sure - what I am missing. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QSortFilterProxyModel::removeRows()
El dv 01 de 06 de 2012 a les 14:15 +0900, en/na Paul England va
escriure:
Hi
I wrote this really long email, and learned a lot about the problem in
doing so. So, I guess it was time well spent. Still frustrated.
Here's the summed up problem:
I have a QAbstrctTabelModel, QSortFilterProxyModel, QItemDelegate, and
a QTableView (all subclassed). As you'd expect, the
QSortFilterProxyModel filters out what I don't want, the delegate
paints what I do, and the view displays everything. Some rows are
updated, and based on user-defined criteria, need to be removed
*AFTER* the proxy has let them in. Before, I was calling
invalidate() in the proxy, but that was calling filterAcceptsRow() on
all rows (visible or not). Yikes. So, I'm now doing removeRows() for
the row(s) that must be removed.
Caveat: my subclassed delegate's paint() is being passed a
QModelIndex() with the *old* data.
Example, my rows are.
Harry
Larry
Bob
bool my_proxy::removeRows( int row, int count, const QModelIndex )
{
beginRemoveRows( QModelIndex(), row, count + row - 1 );
// remove data from model here
endRemoveRows();
}
if I do:
removeRows( 2, 1 );
My model will then show it only has two items.
Harry and Bob
HOWEVER, for the subsequent call to my_delegeate::paint( QPainter*,
const QStyledOptionViewItem opt, const QModelIndex index ) will have
the old index. paint will be called twice, and
index.data().toString() will have Harry for the 1st one, and Larry for
the 2nd.
Am I missing something?
Thanks
Perhaps the fact that indexes are 0-based ?
0 - Harry
1 - Larry
2 - Bob
So if you call removeRows( 2, 1 ); you're removing Bob, as expected...
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Re: [Interest] QSortFilterProxyModel::removeRows()
On 06/01/2012 03:01 PM, Jordi Pujol wrote:
El dv 01 de 06 de 2012 a les 14:15 +0900, en/na Paul England va
escriure:
Hi
I wrote this really long email, and learned a lot about the problem in
doing so. So, I guess it was time well spent. Still frustrated.
Here's the summed up problem:
I have a QAbstrctTabelModel, QSortFilterProxyModel, QItemDelegate, and
a QTableView (all subclassed). As you'd expect, the
QSortFilterProxyModel filters out what I don't want, the delegate
paints what I do, and the view displays everything. Some rows are
updated, and based on user-defined criteria, need to be removed
*AFTER* the proxy has let them in. Before, I was calling
invalidate() in the proxy, but that was calling filterAcceptsRow() on
all rows (visible or not). Yikes. So, I'm now doing removeRows() for
the row(s) that must be removed.
Caveat: my subclassed delegate's paint() is being passed a
QModelIndex() with the *old* data.
Example, my rows are.
Harry
Larry
Bob
bool my_proxy::removeRows( int row, int count, const QModelIndex )
{
beginRemoveRows( QModelIndex(), row, count + row - 1 );
// remove data from model here
endRemoveRows();
}
men
if I do:
removeRows( 2, 1 );
My model will then show it only has two items.
Harry and Bob
HOWEVER, for the subsequent call to my_delegeate::paint( QPainter*,
const QStyledOptionViewItem opt, const QModelIndex index ) will have
the old index. paint will be called twice, and
index.data().toString() will have Harry for the 1st one, and Larry for
the 2nd.
Am I missing something?
Thanks
Perhaps the fact that indexes are 0-based ?
0 - Harry
1 - Larry
2 - Bob
So if you call removeRows( 2, 1 ); you're removing Bob, as expected...
Sorry for not being clear. I am taking the 0-based index into
account. removeRows should actually pass 1,1 in that case.
I know that it's not working b/c when paint is called, I grab the
underlying data structure that supposedly changed (indexed by row). I'm
checking it against QModelIndex::data() within paint() and they do not
match.
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[Interest] QSortFilterProxyModel::removeRows()
Hi
I wrote this really long email, and learned a lot about the problem in
doing so. So, I guess it was time well spent. Still frustrated.
Here's the summed up problem:
I have a QAbstrctTabelModel, QSortFilterProxyModel, QItemDelegate, and a
QTableView (all subclassed). As you'd expect, the QSortFilterProxyModel
filters out what I don't want, the delegate paints what I do, and the
view displays everything. Some rows are updated, and based on
user-defined criteria, need to be removed *AFTER* the proxy has let
them in. Before, I was calling invalidate() in the proxy, but that was
calling filterAcceptsRow() on all rows (visible or not). Yikes. So,
I'm now doing removeRows() for the row(s) that must be removed.
Caveat: my subclassed delegate's paint() is being passed a QModelIndex()
with the *old* data.
Example, my rows are.
Harry
Larry
Bob
bool my_proxy::removeRows( int row, int count, const QModelIndex )
{
beginRemoveRows( QModelIndex(), row, count + row - 1 );
// remove data from model here
endRemoveRows();
}
if I do:
removeRows( 2, 1 );
My model will then show it only has two items.
Harry and Bob
HOWEVER, for the subsequent call to my_delegeate::paint( QPainter*,
const QStyledOptionViewItem opt, const QModelIndex index ) will have
the old index. paint will be called twice, and index.data().toString()
will have Harry for the 1st one, and Larry for the 2nd.
Am I missing something?
Thanks
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Re: [Interest] QSortFilterProxyModel slow updating sql model attached
El 02/05/12 01:51, David Boosalis escribió:
I've not put much stock in the QSqlQueryModel, but instead done my models
derived from QStandardModel. This requires you to write more code for the
SQL
transactions using QT's SQL module (or your own). Granted you have to write
more code and you don't get notices from outside changes to the database. But
with your own mode,l proxy filters are easier to implement.
Taking it a bit further I create my own database class, which does all the sql
stuff. For example part of my Database class looks like this:
class Database : public QObject {
Q_OBJECT
public:
enum {OK=0,Error=1,SQL_ERROR,TableDoesNotExists,TableFormatBad,EntryExists,
EntryDoesNotExists};
typedef enum {Users,Profiles,UssageLog,Models,...NumOfTables} TableType;
enum {NameSize=32,DescriptionSize=256};
static QString tableNames[NumOfTables];
static QString arguments[NumOfTables];
Database(const QString name,const QString user,const QString pass);
~Database();
bool createTable(TableType);
bool isOpen();
bool open();
void close();
bool tableIsValid(TableType);
QString getLastError();
QSqlDatabase *getHandle();
bool validateUsersTable();
bool updateUser(User *);
bool updateUsersExpirationDate(int userID,QDate expirationDate);
bool addUser(User *);
bool deleteUser(qint32 userID);
UserList *getUsers();
.
I don't use the database very much. As a result I can read all the records on
the application startup, cached the records and then be done with the database
except for seldom inserts, edits, and deletes. Maybe this approach will work
for you.
-David
PS
One error I've seen with this approach is that my Qt database handle can go
state after a day, (This code ran on a server). Meaning that all SQL Queries
fail to talk to the MySQL database. I got around this by restarting the
server
code every day from my cron file
Thanks for the advice, I am doing something more like QSqlRelationalTableModel
in my code but much more powerful, it ends using QSqlQueryModel::data for not
changed (in cache) data, but i can edit multiple tables with joins at the same
time and create the correct sql to submit changes taking in account the cache
and such.
Seems that my implementation it is not the best for sort the table on user
action, maybe i could connect the clicks in header to a proper order by change
in the internal model but then unchanged edits would be lost if i don't commit
the changes before and the filter problem remains, would be much better if
QSortFilterProxyModel would be more efficient.
Regards,
Miguel Angel.
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Re: [Interest] QSortFilterProxyModel slow updating sql model attached
Hi, My advice is to ditch QSortFilterProxyModel completely. It's great for models that can be held in memory. But for SQL models, it sucks. Bo. Den 30-04-2012 19:02, Linos skrev: Hi, i have a QTableView with a QSortFilterProxyModel using a QSqlQueryModel as source model, i am using Qt 4.8.1 in Linux x86_64. if i don't apply sort to any of the columns of the table and execute a new .select() on the QSqlQueryModel it does the usual and only call .data method for the visible rows after the new data has been populated but if i have the table sorted by any column the data method gets called 56000 times for a 1000 row table ever using indexes of the sorted col, i can understand that it is sorting at the same it is creating indexes and data. The problem it is i can't get it to ignore sorting to do manually after the new data is populated in the model. i have tried this: 1) call table.setSortingEnabled(False) (with proxyModel.setDynamicSortFilter() using true and false) 2) call proxyModel.invalidate() before model.select() 3) call proxyModel.reset() before model.select() I can't think other way to make this right now, i could set a fake model as source for the proxymodel before call select in model and set the original model after that but it seems awkward to me, should be a better way, so any help please? :) Regards, Miguel Angel. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest Bo Thorsen, Fionia Software. -- Expert Qt and C++ developer for hire Contact me if you need expert Qt help http://www.fioniasoftware.dk ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
