Can you get the sender from a button clicked() event?

[Brad Elliott]

I'm curious as to whether there is a way to access the sender from a button click event. In C++ I've used the static method QObject::sender() to get the sender of the event but I can't seem to figure out how to do this in Python.

def my_click_handler():
    # can I get access to the sender here?
    ...

btn = qt.QPushButton(label, parent)
btn.connect('clicked()', my_click_handler)

By the way, thanks for all the hard work you've done on PythonQt. It is a fabulous project.

[Brad Elliott]

Oh, I think I've figured out a way to do what I wanted. I can just use a closure. The inner function has access to objects in the parent scope so I can access the sender of the event that way.

    def dummy_button_test(parent):
        label = "ClickMe"
        btn = qt.QPushButton(label, parent)

        # Create an inner function to handle the button click. It has
        # access to everything in the scope of dummy_button_test.
        def my_click_handler():
            print btn

        btn.connect('clicked()', my_click_handler)

[Alan Ezust]

QObject.sender() is not a static method, and you can call it from python.
However, depending on the connection type, sender() might not be set
properly. I noticed if I make the connectionType Qt.QueuedConnection it
works when sometimes Qt.DirectConnection does not.

On Tue, Dec 1, 2015 at 6:39 AM, Brad Elliott bradfordelliott@users.sf.net
wrote:

Oh, I think I've figured out a way to do what I wanted. I can just use a
closure. The inner function has access to objects in the parent scope so I
can access the sender of the event that way.

~~~~
def dummy_button_test(parent):
label = "ClickMe"
btn = qt.QPushButton(label, parent)

    # Create an inner function to handle the button click. It has
    # access to everything in the scope of dummy_button_test.
    def my_click_handler():
        print btn

    btn.connect('clicked()', my_click_handler)

~~~~

---

Can you get the sender from a button clicked() event?

---

Sent from sourceforge.net because you indicated interest in <
https://sourceforge.net/p/pythonqt/discussion/631393/>

To unsubscribe from further messages, please visit <
https://sourceforge.net/auth/subscriptions/>

[Devin]

You can also use lambda functions, as described here:
http://stackoverflow.com/questions/27262288/qt-connect-slot-with-argument-using-lambda

def my_click_handler(checked, sender):
    print sender.name()

btn = qt.QPushButton(label, parent)
btn.connect('clicked()', lambda c, p=btn: my_click_handler(c,p))

Makes it quite slick!