So I have a QTableView and I only want to let column sorting on column 1 but not column2.
Naturally I tried to installEventFilter
on QHeaderView
or QTableView
, but MouseButtonPress
event is not being passed unless you installEventFilter
on QApplication
Now if when eventFilter
is called, the target object
is always the top level widget although event.pos()
is actually relative to the header or tablecell depending on where you click.
So we cannot use QHeaderView.rect().contains(event.pos())
to find out if the user clicks on the header because you get false positive when you click on the top edge of the very first table cell.
You can still however calculate this using globalPos but then your eventFilter's logic has to change when you change layout or add more widgets above the tableview.
I believe it is a bug that event.pos() returns the relative pos even the object
argument always refer to the same top level widget.
A more logical API would be that there is a event.target() method to return the target where it calculates the relative pos.
But I don't see a target() method or a way to find the target in this event filter.
Maybe I'm missing something?
# -*- coding: utf-8 -*-
# pyqt windows 4.10.3
# python 2.7.5 32 bits
from PyQt4.QtCore import *
from PyQt4.QtGui import *
app = None
tableHeader = None
class MyModel(QAbstractTableModel):
def rowCount(self, QModelIndex_parent=None, *args, **kwargs):
return 2
def columnCount(self, QModelIndex_parent=None, *args, **kwargs):
return 2
def data(self, modelIndex, role=None):
if modelIndex.isValid():
row = modelIndex.row()
col = modelIndex.column()
if role == Qt.DisplayRole:
return "%02d,%02d" % (row, col)
def flags(self, index):
if index.isValid():
return Qt.ItemIsEnabled
def headerData(self, section, Qt_Orientation, role=None):
if role == Qt.DisplayRole and Qt_Orientation == Qt.Horizontal:
return "Column " + str(section+1)
class MyEventFilter(QObject):
def eventFilter(self, object, event):
if event.type() == QEvent.MouseButtonPress:
# object is always app/top level widget
print 'MouseButtonPress target :' + repr(object)
# even though event.pos() gives pos relative to the header when you click on header,
# and pos relative to table cells when you click on table cell
print repr(event.pos())
# however we can get the mouse's global position
print repr(event.globalPos())
# given the top level widget's geometry
print repr(app.activeWindow().geometry())
# and the table header's left, top and height
print repr(tableHeader.rect())
# we can find out whether mouse click is targeted at the header
print repr(event.globalPos().y() - app.activeWindow().geometry().y())
# BUT WHAT IF THE LAYOUT CHANGE OR WE ADD MORE WIDGETS ABOVE THE TABLEVIEW?
# WE HAVE TO ADJUST THE CALCULATION ABOVE!
return False
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
w = QMainWindow()
t = QTableView()
tableHeader = t.horizontalHeader()
t.setModel(MyModel())
w.setCentralWidget(t)
ef = MyEventFilter()
# installing in QMainWindow or QTableView won't catch MouseButtonPress
# https://qt-project.org/forums/viewthread/9347
#w.installEventFilter(ef)
#t.installEventFilter(ef)
app.installEventFilter(ef)
w.show()
sys.exit(app.exec_())