Created
March 3, 2020 02:58
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''' | |
Different ways to doSomething(row, column) based on the clicked button | |
''' | |
class GuiBase(QtWidgets.QWidget): | |
def doSomething(self, row, column): | |
print(row, column) | |
''' | |
Using a "matrix" and self.sender() | |
''' | |
class GuiDefGrid(GuiBase): | |
def __init__(self): | |
super().__init__() | |
layout = QtWidgets.QGridLayout(self) | |
self.grid = [] | |
for row in range(4): | |
rowList = [] | |
self.grid.append(rowList) | |
for column in range(4): | |
button = QtWidgets.QPushButton('{} {}'.format(row, column)) | |
layout.addWidget(button, row, column) | |
rowList.append(button) | |
button.clicked.connect(self.doSomethingFromButton) | |
def doSomethingFromButton(self): | |
sender = self.sender() | |
for row, rowList in enumerate(self.grid): | |
for column, button in enumerate(rowList): | |
if button == sender: | |
self.doSomething(row, column) | |
break | |
''' | |
Setting a custom object attribute, also with sender() | |
''' | |
class GuiDefAttrib(GuiBase): | |
def __init__(self): | |
super().__init__() | |
layout = QtWidgets.QGridLayout(self) | |
for row in range(4): | |
for column in range(4): | |
button = QtWidgets.QPushButton('{} {}'.format(row, column)) | |
layout.addWidget(button, row, column) | |
button.clicked.connect(self.doSomethingFromButton) | |
button.coords = (row, column) | |
def doSomethingFromButton(self): | |
sender = self.sender() | |
self.doSomething(*sender.coords) | |
class GuiLambda(GuiBase): | |
def __init__(self): | |
super().__init__() | |
layout = QtWidgets.QGridLayout(self) | |
for row in range(4): | |
for column in range(4): | |
button = QtWidgets.QPushButton('{} {}'.format(row, column)) | |
layout.addWidget(button, row, column) | |
button.clicked.connect(lambda _, r=row, c=column: self.doSomething(r, c)) |
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Yes, you're right, that's another option.
Nonetheless I don't think that's an improvement over lambda (but I realize that it's also a matter of preference and habit, amongst other things), since in similar cases (and others I was referring to in my comment) one doesn't really care about the function name as you also pointed out, and the syntax is usually smaller and easier to write/read.
Plus, it takes half the lines :-P