Reputation: 2284
I have a family of classes (based on the same parent class) that are data cells in a QTableWidget (so they are all derived from QItemDelegate).
I'm trying to create a signal that these classes can pass up to the controller to communicate data changes.
I can't find the right combination (despite much experimentation and reading) which accomplished. Here's my class structure:
Base Class:
class Criteria(QItemDelegate):
def bind(self, update):
self.connect(self,SIGNAL("criteriaChange(int, int, QVariant)"),update)
def emitCommitData(self):
self.emit(SIGNAL("criteriaChange(int, int, QVariant)"), self.Row, self.Col, self.getValue())
Example Sub-class (just the relevant parts -- LMK if more info needed):
class YesNo(Criteria):
....
def createEditor(self, parent, option, index):
self.comboBox = QComboBox(parent)
for item in self.getChoices():
self.comboBox.addItem(item)
self.comboBox.activated.connect(self.emitCommitData)
return self.comboBox
....
Here's the relevant portion of my master class:
@pyqtSlot(int, int, QVariant, name='criteriaChanged')
def setItem(self, row, col, item):
print row, col, item.toString() # TODO: Remove when tested
self.Data[row][col] = item.toString()
def addCriteria(self, row, cname, ctype):
self.setDirty()
c = YesNo(cname, "YesNo")
c.bind(self.setItem)
The above code gives an "Underlying C++ object has been deleted". I've tried this:
def addCriteria(self, row, cname, ctype):
self.setDirty()
c = YesNo(cname, "YesNo")
self.connect(c,SIGNAL("criteriaChange(int, int, QVariant)"),self.setItem)
Any suggestions? I don't have to use this method, but rather need a way to get that data out of the individual controls.
TIA
Mike
Upvotes: 1
Views: 1556
Reputation: 2284
I'm really embarrassed about this. Hopefully this will help somebody else.
I didn't call the Qt initialization for the appropriate object:
class YesNo(Criteria):
def __init__(self, name, ctype):
Criteria.__init__(self) # <<<<----- This was missing before
self.Name = name
self.Index = ctype
and
class Criteria(QItemDelegate):
def __init__(self):
QItemDelegate.__init__(self) # <<<<----- This was missing before
Upvotes: 1
Reputation: 8149
criteria.py
def criteria_change(row, col, new_value):
print "change at", row, col, "new_value:", new_value
class Criteria:
def __init__(self, row, col):
self.row, self.col = row, col
def on_change(self):
criteria_change(self.row, self.col, self.value())
yes_no_maybe.py
from PyQt4.QtGui import *
from criteria import Criteria
class YesNoMaybe(Criteria):
def create_editor(self):
group_box = QGroupBox()
layout = QVBoxLayout()
group_box.setLayout(layout)
self.buttons = []
for s in ["yes", "no", "maybe"]:
button = QRadioButton(s)
self.buttons.append(button)
layout.addWidget(button)
button.toggled.connect(self.on_toggle)
return group_box
#
def on_toggle(self, is_now_on):
if is_now_on:
self.on_change()
def value(self):
for button in self.buttons:
if button.isChecked():
return button.text()
#
yes_no.py
from PyQt4.QtGui import QComboBox
from criteria import Criteria
class YesNo(Criteria):
def create_editor(self):
combo_box = self.combo_box = QComboBox()
for s in ["red", "blue"]:
combo_box.addItem(s)
combo_box.activated.connect(self.on_change)
return combo_box
#
def value(self):
return self.combo_box.currentText()
#
main.py
import sys
from PyQt4.QtGui import *
from yes_no_maybe import YesNoMaybe
from yes_no import YesNo
app = QApplication(sys.argv)
table_classes = [[YesNo, YesNo],
[YesNoMaybe, YesNoMaybe]]
table = QTableWidget(len(table_classes), len(table_classes[0]))
table.criteria = []
for r, cls_row in enumerate(table_classes):
criteria_row = []
table.criteria.append(criteria_row)
for c, criteria_cls in enumerate(cls_row):
criteria = criteria_cls(r, c)
criteria_row.append(criteria)
table.setCellWidget(r, c, criteria.create_editor())
table.setRowHeight(1, 100)
table.show()
app.exec_()
Upvotes: 0