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Make QTreeWidgetItem unique among siblings

Is there some way to make sure that updating an existing QTreeWidgetItem or inserting a new one ensures that the item is unique among its siblings based on the value of a single column?
I have tried to do something like this with a QTreeView and my own custom model and have gotten it to work, but some advanced features like moving items with drag and drop are eluding me. I figure, the QTreeWidget and QTreeWidgetItem classes ought to get more of this type of stuff for free and ought to cause me fewer headaches throughout. However, I still need to be able to guarantee uniqueness if I go the QTreeWidget route. Can this be done? If so, how?
NOTE:
I am using PySide, but I marked this question as PyQt as well since most solutions cross over between the two without much fuss.

AuiNotebook - Get clicked tab

I am currently using some wxPython's AuiNotebook in one of my projects and I have a problem that can't manage to solve. I think there should be a simple solution but can't manage to find it.
I have created a new class derived from wx.lib.agw.aui.AuiNotebook and I am trying to get the index of a tab at the moment it's clicked. I wrote something like that:
class NewNotebook(wx.lib.agw.aui.AuiNotebook):
# __init__ function an stuff...
def OnTabClicked(self, evt):
index = self.GetSelection()
print index
wx.lib.agw.aui.AuiNotebook.OnTabClicked(self, evt)
The aim was to capture the index of the tab clicked on and in some cases, have a special behavior, or just perform a regular click otherwise. However, I think that AuiNotebook.OnTabClicked actually changes the selection among different things. It would explain why index contains the value of the tab that was selected before the click.
I did not a find a way to get the selection of the new tab though. I looked for some information in the captured event but still could not find the one I wanted.
So, does someone know how I can get the selected tab before I call AuiNotebook.OnTabClicked?

There doesn't seem to be a builtin way to do this. The closest I found was something I helped with on the wxPython mailing list, but that had to do with double-clicking.
Here's one workaround that came to me though. When you first show the frame, set some kind of class property to the currently shown tab (i.e. self.currentTab = 0). Then catch the EVT_AUINOTEBOOK_PAGE_CHANGING or EVT_AUINOTEBOOK_PAGE_CHANGED event and update the property. For me, when I catch EVT_AUINOTEBOOK_PAGE_CHANGING, I always get the index of the tab I'm clicking on, at least on Windows.

Customize QTreeView items

I'm new to PySide and Qt at all, and now need to create an application which has a tree view with styled items. Each item needs two lines of text (different styles), and a button. Many items are supposed to be in the view, so I chose QTreeView over QTreeWidget. Now I managed to add simple text items (non-styled) to the QTreeView and have almost no idea about how to place several widgets on one item. Could you please give me an example of how to create such design?
I've found some samples on the Internet, that are similar to what I want, but they all are in C++, and it's not obvious how to convert delegates and other things to Python. I'm now really confused about it all...

I'd recomend you use simple QTreeWidget and insert complex widgets with setItemWidget. While Qt's widhets are alien, they are not so heavy to draw, but:
You shouldn't create delegates.
You shouldn't handle events (If you are going to place button in view and draw it using delegates, you had to handle all its events, such as mouseOver, focus changing, etc. It is a lot of work.

Make Spinctrl selected when activated in WxPython

I have 4 spinctrls in my app. When I click on them, I want all their
content to be selected instantly. And another thing is, I need to make
them tab traversal. Can you help me with some sort of code to do this
task?
Thanks in advance.

You need to catch EVT_SPIN or EVT_SPINCTRL and in your handler, you can select all the values by calling each of the control's GetValue method. In the wxPython demo, it seems to support tab traversal. I'm not sure what's going on with yours. Did you try the FloatSpin widget as an alternative?

How to make PowerBuilder UI testing application?

I'm not familiar with PowerBuilder but I have a task to create Automatic UI Test Application for PB. We've decided to do it in Python with pywinauto and iaccesible libraries. The problem is that some UI elements like newly added lists record can not be accesed from it (even inspect32 can't get it).
Any ideas how to reach this elements and make them testable?

I'm experimenting with code for a tool for automating PowerBuilder-based GUIs as well. From what I can see, your best bet would be to use the PowerBuilder Native Interface (PBNI), and call PowerScript code from within your NVO.
If you like, feel free to send me an email (see my profile for my email address), I'd be interested in exchanging ideas about how to do this.

I didn't use PowerBuilder for a while but I guess that the problem that you are trying to solve is similar to the one I am trying to address for people making projects with SCADA systems like Wonderware Intouch.
The problem with such an application is that there is no API to get or set the value of a control. So a pywinauto approach can't work.
I've made a small tool to simulate the user events and to get the results from a screencapture. I am usig PIL and pytesser ORM for the analysis of the screen captures. It is not the easiest way but it works OK.
The tool is open-source and free of charge and can be downloaded from my website (Sorry in french). You just need an account but it's free as well. Just ask.
If you can read french, here is one article about testing Intouch-based applications
Sorry for the self promotion, but I was facing a similar problem with no solution so I've written my own. Anyway, that's free and open-source...

I've seen in AutomatedQa support that they a recipe recommending using msaa and setting some properties on the controls. I do not know if it works.

If you are testing DataWindows (the class is pbdwxxx, e.g. pbdw110) you will have to use a combination of clicking at specific coordinates and sending Tab keys to get to the control you want. Of course you can also send up and down arrow keys to move among rows. The easiest thing to do is to start with a normal control like an SLE and tab into the DataWindow. The problem is that the DataWindow is essentially just an image. There is no control for a given field until you move the focus there by clicking or tabbing. I've also found that the DataWindow's iAccessible interface is a bit strange. If you ask the DataWindow for the object with focus, you don't get the right answer. If you enumerate through all of the children you can find the one that has focus. If you can modify the source I also advise that you set AccessibleName for your DataWindow controls, otherwise you probably won't be able to identify the controls except by position (by DataWindow controls I mean the ones inside the DataWindow, not the DataWindow itself). If it's an MDI application, you may also find it useful to locate the MicroHelp window (class fnhelpxxx, e.g. fnhelp110, find from the main application window) to help determine your current context.
Edited to add:
Sikuli looks very promising for testing PowerBuilder. It works by recognizing objects on the screen from a saved fragment of screenshot. That is, you take a screenshot of the part of the screen you want it to find.