Yes, I know this sounds crazy. But here's the situation.
I composed a minimal code reproducing the bug. The code creates main window with QTabWidget, which, in turn, has one tab with QListView and a button. List view is connected to QAbstractListModel. Initially, list model contains empty list. If user clicks on a button, it is populated with 3 elements and corresponding signal is emitted. On this signal, tab widget emits a signal with new title, which is caught by QMainWindow and used to change tab title.
So, the problem is, if I call setTabText() with this new title, list view remains empty until I click on it (then new items instantly appear). If I use new title in setWindowTitle() instead, new items appear in list view right after pressing the button. Am I doing something wrong, or is there some bug in QTabWidget (or Python mapping)?
Code is the following:
from PyQt4 import QtGui, QtCore
import sys
class MainWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.setWindowTitle("Test")
self._tabbar = QtGui.QTabWidget()
self.setCentralWidget(self._tabbar)
tab = SearchWindow(self)
tab.titleChanged.connect(self._refreshTabTitle)
self._tabbar.addTab(tab, "Initial title")
def _refreshTabTitle(self, title):
# if line 1 is commented - no bug, if line 2 is commented - bug exists
self._tabbar.setTabText(0, title) # line 1
#self.setWindowTitle(title) # line 2
class SearchWindow(QtGui.QSplitter):
titleChanged = QtCore.pyqtSignal(str)
def __init__(self, parent):
QtGui.QSplitter.__init__(self, QtCore.Qt.Vertical, parent)
results_model = ResultsModel(self)
results_view = QtGui.QListView()
results_view.setModel(results_model)
self.addWidget(results_view)
search_button = QtGui.QPushButton(">>")
search_button.clicked.connect(results_model.refreshResults)
self.addWidget(search_button)
results_model.searchFinished.connect(self._refreshTitle)
def _refreshTitle(self):
self.titleChanged.emit("New title")
class ResultsModel(QtCore.QAbstractListModel):
searchFinished = QtCore.pyqtSignal()
def __init__(self, parent):
QtCore.QAbstractListModel.__init__(self, parent)
self._results = []
def rowCount(self, parent):
return len(self._results)
def data(self, index, role=QtCore.Qt.DisplayRole):
if not index.isValid():
return None
elif index.row() = len(self._results):
return None
elif role == QtCore.Qt.DisplayRole:
return self._results[index.row()]
def refreshResults(self):
self._results = ['result1', 'result2', 'result3']
self.reset()
self.searchFinished.emit()
app = QtGui.QApplication(sys.argv)
wnd = MainWindow()
wnd.show()
sys.exit(app.exec_())Tested on Mac OS 10.6.2, Qt SDK 2009.04 (4.5), pyQt 4.6.1 (maybe this is the problem and I need to use 4.5?), Python 3.1.