[SOLVED] How to make visible / select first item using a (sub)string and QSortFilterProxyModel ?

mvidelgauz

Thank you jazzycamel for you prompt and detailed answer. And sorry for my late respond ((

I will try to implement what you suggested (although I need first to translate it to PyQt ))) )

jazzycamel

I actually prototyped this in python first as follows:

@
import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)

from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Model(QAbstractTableModel):
def rowCount(self , parent=QModelIndex()): return 100
def columnCount(self, parent=QModelIndex()): return 1
def data(self, index, role=Qt.DisplayRole):
if not (index.isValid() and role==Qt.DisplayRole): return None
return "{0}".format(index.row())

class Proxy(QSortFilterProxyModel): pass
class List(QListView):
@pyqtSlot(str)
def search(self, text):
self.selectionModel().clear()
if text=="": return

    start=self.model().index(0,0)
    indexes=self.model().match(start, Qt.DisplayRole, text, hits=-1)

    for index in indexes:
        self.selectionModel().select(index, QItemSelectionModel.Select)

if name=="main":
from sys import argv, exit

class Widget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        l=QVBoxLayout(self)

        self._search=QLineEdit(self, placeholderText="Search...")
        l.addWidget(self._search)

        self._model=Model(self)
        self._proxy=Proxy(self)
        self._proxy.setSourceModel(self._model)
        self._list=List(self)
        self._list.setModel(self._proxy)
        self._search.textChanged.connect(self._list.search)

        l.addWidget(self._list)

        self.setFocus()

a=QApplication(argv)
w=Widget()
w.show()
w.raise_()
exit(a.exec_())

@

Might save you a bit of time and effort. Hope this helps ;o)

mvidelgauz

Thank you again jazzycamel for your code snippets!

First of all, in response to your first reply I want to say that that I used proxy model for the purpose it is designed - I want my ListView to be sorted. And that also helped me to filter items of course. My original code was:
@
def lineEditTextEdited(self, text):
self.listModel.setFilterFixedString(text)
@

'self.listModel' in my widget is QSortFilterProxyModel, I'm saving it in setModel() method of widget:
@
def setModel(self, model):
self.listModel = model
self.listView.setModel(model)
@

Now I am trying to use your suggestion. If I understand your code correctly in line 44 you are setting your list's model to proxy model, so in lines 22 and 23 you are calling methods index and match of proxy model. So my first version after change was:

@
def lineEditTextEdited(self, text):
#self.listModel.setFilterFixedString(text)
self.listView.selectionModel().clear()
if text=="": return
start=self.listModel.index(0,0)
indexes=self.listModel.match(start, QtCore.Qt.DisplayRole, text, hits=-1)
for index in indexes:
self.listView.selectionModel().select(index, QItemSelectionModel.Select)
@

It didn't work and since I understood from your first reply that I should use original model, not proxy the second version is:

@
def lineEditTextEdited(self, text):
#self.listModel.setFilterFixedString(text)
self.listView.selectionModel().clear()
if text=="": return
start=self.listModel.sourceModel().index(0,0)
indexes=self.listModel.sourceModel().match(start, QtCore.Qt.DisplayRole, text, hits=-1)
for index in indexes:
self.listView.selectionModel().select(index, QItemSelectionModel.Select)
@

In both versions 'indexes' result is empty array (0 items)...

Can you please tell me what is wrong in my code?

jazzycamel

In line 22-23 of my example I am calling the model() method on my view which will return the model to which that view is attached, in this case its the proxy model so your first attempt was correct.

I'm afraid I can't tell you why this isn't working for your particular application without seeing a bit more code. What type does the data() method of your model return for the DisplayRole? I'm wondering if match is failing because its comparing search type string to something else (QVariant for example).

Sorry I can't be more help.

mvidelgauz

I think the problem is mathflags. If I am typing string from the beginning then everything is working as expected (I see that default value of 'flags' parameter of match method is Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap )

But I trying to match by substring - like setFilterFixedString(text) did. So I tried:

@
start=self.listModel.sourceModel().index(0,0)
flags = Qt.MatchFlags(Qt.MatchFixedString)
indexes=self.listModel.sourceModel().match(start, QtCore.Qt.DisplayRole, text, -1, flags)
@

and since you confirmed that I don't need source model:
@
start=self.listModel.index(0,0)
flags = Qt.MatchFlags(Qt.MatchFixedString)
indexes=self.listModel.match(start, QtCore.Qt.DisplayRole, text, -1, flags)
@

still indexes contains 0 items... and even worse - no matches even if type string from the begging..
I suspect that I am not settings flags correctly...

my data() method returns String for DisplayRole...

mvidelgauz

Yes, flags should be Qt.MatchFlags(Qt.MatchContains | Qt.MatchWrap)
(method name 'setFilterFixedString' confused me...)

now 'indexes' are exactly what I expect them to be

but self.listView.selectionModel().select(index, QItemSelectionModel.Select) has no visual effect - no items actually selected...

jazzycamel

I was just about to suggest MatchContains ;o)

The indexes needs to belong to which ever model the view is attached to. If you are calling match() on the source model (which you shouldn't need to, the proxy will be fine as per example) then you will have to map them back to the proxy using mapFromSource().

mvidelgauz

Thank you again )))

no, as I mentioned in previous post I removed sourceModel(). call from code

'self.listModel' is what ListView is attached to

something is wrong with my ListView itself (regardless to code being discussed) - It doesn't select rows even when I click on them...

mvidelgauz

Anyway, the original question is answered by jazzycamel

How do I mark this topic [SOLVED]?

SGaist

Hi,

Simply edit the thread title and add [solved] to it :)

mvidelgauz

Thank you SGaist! :)