[PySide] Form dialog subclassing QDialog

[Aaron Richiger]

Hello Jerome!

Welcome in the PySide world... Would it be possible, to send us the code 
(source files). It's always great to run the code, a UI or a error 
message often says more than many words...

Cheers
Aaron

Am 28.02.2014 18:32, schrieb Jérôme:
> Hi everyone.
>
> I know Python and have been playing a bit with PyGTK. Now, I am
> discovering Qt and PySide and I'm having a hard time trying to implement
> a form dialog.
>
> I have a main window displaying a list of items with a few attributes.
> Aside from the TableView, I added three buttons : Add, Edit, Remove.
> When clicking Add, I want a new window to popup, containing a form to
> enter the values of the new item. Basically, I want the dialog to have
> an OK and a Cancel button. When the user clicks OK, the dialog closes,
> and in the main window, the new item is added to the list.
>
> (I realize this may be a subcase of Edit with default values, but I'm
> beginning simple with Add, and I'll figure out Edit afterwards.)
>
> I'm therefore creating a dialog subclassing QDialog. Both main window
> and dialog window are designed with QtDesigner.
>
> I need a design hint and the examples I found didn't help.
>
> Here's my dialog class (the items happen to be buildings in this case,
> hence the name), with only an __init__() function:
>
> class buildingDialog(QtGui.QDialog):
>
>      def __init__(self, parent=None):
>          super(buildingDialog, self).__init__(parent)
>          self.ui = dialogBuilding.Ui_Dialog()
>          self.ui.setupUi(self)
>
> And here is the call:
>
>      def addPushButtonClicked(self):
>
>          dialog = bui.buildingDialog(self)
>          print(dialog.exec_())
>
> The print is here for debug purposes and prints 0 or 1 depending on
> which button was pressed.
>
> What I want is to get the form values from the dialog and use them in
> the add_item() function in the caller, like this:
>
> if the return value is made of item attributes (i.e. the user pressed
> OK)
>      add_item(attributes = return value)
> else (the user pressed cancel)
>      nothing...
>
> I could modify the return value of the dialog, to return a list of item
> attributes. But I suppose it's better to keep 0 and 1 as return values
> and return the values another way. Besides I don't know how to do this
> anyway.
>
> I could return a couple like [values, returnvalue], with returnvalue
> being 0 or 1, but again, the return values would not be 0 or 1 anymore.
>
> I could let the caller read the values in an attribute of the dialog (or
> through a getter) before the dialog gets closed/destroyed, but I don't
> know how to do that.
>
> It looks like a nicer way would be to reproduce the behaviour of the
> QColorDialog, for instance.
>
> The caller only does
>
> color = QtGui.QColorDialog.getColor()
>
> if color.isValid():
>      do stuff
>
> But I don't know how to handle this from my custom dialog.
>
> I'm pretty sure this is a very common design problem.
>
> My questions are
>
> - Am I right about trying to copy QColorDialog ?
>
> - If yes, do you have a hint about how to do that ?
>
> - If no, then what would you suggest ?
>
> - The program I'm working on is an interface to enter data about a set
> of buildings. This mechanism will be reproduced all along: a projet has
> buildings with attributes (size, age,...), buildings have boiler rooms
> with attributes (name, manager,...), boiler rooms have boilers with
> attributes (age, efficiency,...), etc. Do you think I'm going in the
> wrong direction ? Is subclassing QDialog a bad idea in the first place ?
>
> - Most PySide examples I found were about using common dialogs. Should I
> seek C++ examples and try to adapt them ?
>
> Thank you very much for any pointer.
>
> Have a nice week-end.
>