How to use QMdiSubWindow classes ?

QtDigitex

Hi ,

i'm using pyqt4 and trying to make an MDI little application :

i have two script : the main one inherits from QMainWindow and the second one that inherits from QWidget : it represents the type of document my application open each time i click on Open.

i'm having trouble about two issues :

How to send a signal from my main script to the CURRENTLY ACTIVE Widget ( even if i opened several documents ) in order to run a method that's inside the widget class ( opened document ) ?
Isn't it possible to run the methods inside my Widget class whithout sending a signal ?
I tried this :

self.actualWidget = self.mdiArea.activeSubWindow()
self.actualWidget.test_method()   # test_method is just for testing if it will run

i always get the error message :

AttributeError : 'QMdiSubWindow' has no attribute 'test_method'.

it's just as if activeSubWindow() returns a QMdiSubWindow instead of my CURRENTLY ACTIVE Widget ...

Any Help please ? !

Thanks,

jsulm

@QtDigitex For me it is not clear how you use your QWidget derived class as MDI sub window? If you put your QWidget class in a QMdiSubWindow then you have to get it from there first and then call your methods.

QtDigitex

Hi ,

yes , i don't know how to do it , it's my first time . this is what i did :

i made the design of both ( Main window & documents window ( it's a QGraphicsView +
QTableWidget for each opened file ) )Via QtDesigner , so i choosed to create a QWidget ( there's no QMdiSubWindow ) and got the py code via pyuic4.

in my secondary class i wrote :

class Window_Widget (  QWidget , Ui_Form) : # Since i choosed in QtDesigner to create a QWidget and it's name is Form ( the Ui_Form class is issued from pyuic 4 )

i think the problem comes from here , because if i change QWidget to QMdiSubWindow , the signals works greatly but the design and layouts that i made in QtDesigner breaks down ...

mrjj

@QtDigitex said:

QMdiSubWindow

Hi Normally , you talk to the widget you have inside the mdi window.
If using a plain MDIwindow, then you insert your widget with
http://doc.qt.io/qt-4.8/qmdisubwindow.html#setWidget
and get with widget()
And then cast to the correct type to call functions.

Alternative you derive from QMdiSubWindow and expand with new functions.

QtDigitex

Thank you so much ,

all the problem comes from not accessing the widget Inside my QmdiSUbWindow , the widget() method resolved the problem. Now it works perfectly , thanks.

But , can you please detail your second method , you mean that my secondary class must inherits QMdiSubWindow like this ? :

class Widget_Window ( QMdiSubWindow , Ui_Form):

the problem is that i made the design with QtDesigner and the code like this breaks all the layouts and the display. However , signals work

mrjj

uhh, Im python noob :)
so not sure about syntax.

in c++, it would be
class MyMDI : QMdiSubWindow
Then the actual MDIsubWindow would be your type and could have extra functions.
You would then have to new MYMDI and give to the Area with
http://doc.qt.io/qt-5/qmdiarea.html#addSubWindow

and when using activeSubWindow, you would cast to myMDI type and call functions.
( talking c++, python ,might allow something else :)

QtDigitex

Ok Thanks