maya pyside2 shelf button

[blossom ghuntla]

Hello Guys,

I have a query regarding shelf button of UI

i have created a ui with pyside2 and put it on the maya shelf

i click to open the ui it works well

as i do it for the second time it opens same UI for the second time

so is there a better way to write a main().close

would be very grateful if an example is provided

i found a reference on http://nathanhorne.com/pyqt-and-maya-2011/

def main():
    global win
    try:
        win.close()
    except: pass
win = MyWindowClass()
win.show()




Thank You.


[Justin Israel]

The exact answer depends on how your shelf button code is actually launching the UI, and also then specific behavior you want. 

If your UI is still showing when they click the button a second time do you want it to close the existing one and show a new one? Or do you want it to leave the exist one and show a new copy? 

I'm guessing from your example that you keep a global reference to the UI instance that you launch, in your module, and that you probably launch it by calling a main() function. If that is what you do, you can try calling win.deleteLater() to kill the existing one and catch the exception if it's not there. 

Or if you want to allow multiple brand new instances, you can just not use the global to that you create a new one each time, and then have it automatically delete itself on close with

    

    win = CreateNewWin(...) 

    win.setAttribute(QtCore.Qt.WA_DeleteOnClose, True)




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[blossom ghuntla]

Hello Justin,

Thanks for the reply

and sorry for late reply i was not well

If your UI is still showing when they click the button a second time do you want it to close the existing one and show a new one?

yes

Or do you want it to leave the exist one and show a new copy? 

no

I'm guessing from your example that you keep a global reference to the UI instance that you launch, in your module, and that you probably launch it by calling a main() function. If that is what you do, you can try calling win.deleteLater() to kill the existing one and catch the exception if it's not there. 

the way i am doing is

i have created multiple classes and saved as a package

and i have the path saved in env variable 

so i just import the module and do exactly as you mentioned above execute main()

so i saved the above import in the shelf

clicking it opens the UI

clicking the shelf button second time should close the existing UI and open the UI again and, even if the UI is closed its instance should be deleted and, when clicked on shelf button again create a new UI(instance)

probably this is what you meant 

What is the logic behid this?

 if you want to allow multiple brand new instances, you can just not use the global to that you create a new one each time, and then have it automatically delete itself on close

   win = CreateNewWin(...) 

   win.setAttribute(QtCore.Qt.WA_DeleteOnClose, True)

and which is the most preferred one

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[Justin Israel]

On Tue, Feb 5, 2019, 5:27 PM blossom ghuntla <bghun...@gmail.com> wrote:

Hello Justin,

Thanks for the reply

and sorry for late reply i was not well

If your UI is still showing when they click the button a second time do you want it to close the existing one and show a new one?

yes

Or do you want it to leave the exist one and show a new copy? 

no

I'm guessing from your example that you keep a global reference to the UI instance that you launch, in your module, and that you probably launch it by calling a main() function. If that is what you do, you can try calling win.deleteLater() to kill the existing one and catch the exception if it's not there. 

the way i am doing is

i have created multiple classes and saved as a package

and i have the path saved in env variable 

so i just import the module and do exactly as you mentioned above execute main()

so i saved the above import in the shelf

clicking it opens the UI

clicking the shelf button second time should close the existing UI and open the UI again and, even if the UI is closed its instance should be deleted and, when clicked on shelf button again create a new UI(instance)

probably this is what you meant 

What is the logic behid this?

 if you want to allow multiple brand new instances, you can just not use the global to that you create a new one each time, and then have it automatically delete itself on close

   win = CreateNewWin(...) 

   win.setAttribute(QtCore.Qt.WA_DeleteOnClose, True)

and which is the most preferred one

Based on your clarifications, you want to check if your win global variable is not None, and then call win.deleteLater()

This will kill the previous window so that you may create a new instance. 

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[blossom ghuntla]

yes 

but again is this the preferred technique

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[Justin Israel]

On Tue, Feb 5, 2019, 7:31 PM blossom ghuntla <bghun...@gmail.com> wrote:

yes 

but again is this the preferred technique

Ok, but is this a question or are you confirming you have solved the issue with the suggested technique? 

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[Michael Boon]

For simple situations, this technique comes with some risk that you might override or otherwise lose the global variable. Make sure you give it a good, unique name. Note that if it's a module variable, and you reload the module, Python does not delete the variable, so that should still work.

The Maya documentation recommends you use maya.OpenMayaUI.MQtUtil.findControl to find your windows by name, and then shiboken.wrapInstance to bring it into Python. Assuming you continue to make your window more sophisticated, and it ends up being saved in the Maya workspace and automatically reopened when Maya opens, I think you will need to do it that way.

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[blossom ghuntla]

Hi Justin, its a question about the technique that i have used is it appropriate for longer term?

Hi Michael Boon, as per your suggestion i'll look into OpenMayaUI 

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[Justin Israel]

On Wed, Feb 6, 2019, 4:20 PM blossom ghuntla <bghun...@gmail.com> wrote:

Hi Justin, its a question about the technique that i have used is it appropriate for longer term?

Sorry for the delayed reply. 

Using the global window variable in the module could work fine. No one should be using the reload() command in production anyways because it can lead to broken code. It's only for specialised situations or testing. 

Another way is if you look up the singleton pattern. But I leave that to you to Google. 

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[blossom ghuntla]

Thank you all for the reply and information it was very helpful

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