[PySide] simple QTableView example

Sun Oct 13 00:06:55 CEST 2013

If you ask me personally, I wouldn’t use QTableWidget. Look into QTreeView or QListWidget.

I think they are more suitable for such tasks and are easier to handle.

With QTreeView you can use QItemDelegate, to create a special rendering.

With QListWidget you can simply add a widget per row and inside the widget you can put whatever.

ATM I’m in the middle of a 2000 km road trip so I can’t rally provide you sample's, but if you need help next week I’m glad to give you samples how to use these widgets.

Cheers,

Tibold Kandrai

From: Frank Rueter | OHUfx
Sent: ‎Saturday‎, ‎12‎ ‎October‎ ‎2013 ‎22‎:‎49
To: Tibold Kandrai
Cc: pyside at qt-project.org

Is this the best way to do it though? I.e. having one item per cell? s there another way at all?
I'm still a bit lost in the model/view design and can't find the answer online.

I'm simply trying to have each row represent a "task" with a title/description (string), a status (boolean) and a priority (integer). For the integer I need a spin box and for the boolean I need a checkbox. The examples I found online all seem to be doing something slightly different and often use different ways which makes matters more confusing.

Here is what I have at the moment:
http://pastebin.com/H3GD0xVB

The "status" and "priority" values don't display currnelty as I haven't figured out how to properly assign a delegate to just those cells. At the top I tried to define a n item delegete for a spin box but I'm not sure how to properly assign it.

Do I have to make the delegate draw different widgets (spin box / checkbox) depending on data type, or can/should I use a different delegate for each cell?

I'm sure the answer is right in front of me, could you please help one more time please?!

Cheers,
frank

On 11/10/13 4:00 PM, Tibold Kandrai wrote:

If you mean to use a QStandardItem per cell then yes.
Also for storing values that you want to display, use the Qt.DisplayRole as role.

Cheers,
Tibold Kandrai

From: Frank Rueter | OHUfx
Sent: ‎11/‎10/‎2013 14:35
To: Tibold Kandrai
Cc: pyside at qt-project.org
Subject: Re: [PySide] simple QTableView example

one more silly question if I may:
So if I have a task like this:
        newTask = {'title':'new task', 'priority':1, 'status':False}

and need to store the data in one row in the model I should use three different items, one for each value, right?!

e.g.:

        newTask = {'title':'new task', 'priority':1, 'status':False}
        row = self.model.rowCount()
        for column, attr in enumerate(['title', 'priority', 'status']):
            newItem = QtGui.QStandardItem(newTask[attr])
            self.model.setItem(row, column, newItem)

then juggle delegates or widgets to use a spin box for the integer and a checkbox for the boolean...

Thanks for the help!

Cheers,
frank

On 10/10/13 11:44 PM, Tibold Kandrai wrote:

Hey,

I’m not sure I understand the problem correctly.

If you want to store data in a cell or a QStandardItem, then you need to use setData() and data().

Generally you shouldn’t need to subclass QStandardItem or QStandardItemModel.

Here is an example how:

# Define roles

FINISHED_ROLE = QtCore.Qt.UserRole + 1
PRIORITY_ROLE = QtCore.Qt.UserRole + 2

# Create model

model = QtGui.QStandardItemModel()

item = QtGui.QStandarItem()

model.appendRow(item)

item_index = item.index()

# Store data using the item

item.setData(finished, FINISHED_ROLE)

item.setData(priority, PRIORITY_ROLE)

# Store data using the model

model.setData(item_index, finished, FINISHED_ROLE)

model.setData(item_index, priority, PRIORITY_ROLE)

# Retrieve data using the item

finished = item.data(FINISHED_ROLE)

priority = item.data(PRIORITY_ROLE)

# Retrieve data using the model

finished = model.data(item_index, FINISHED_ROLE)

priority = model.data(item_index, PRIORITY_ROLE)

In some cases like click event handlers, you have the model and the item index, there it’s easier to use the model methods instead of finding the item and then getting the data. 😉

Hope it helps.

Cheers,

Tibold

From: Frank Rueter | OHUfx
Sent: ‎2013‎ ‎October‎ ‎10‎, ‎Thursday ‎19‎:‎37
To: pyside at qt-project.org

After looking at some more examples I think my approach of storing multiple values in one item is fundamentally flawed.
Instead I should be using one item per cell and assign the respective data, right?!

I shall re-write the example accordingly, sorry for the noise.

frank

On 10/10/13 6:34 PM, Frank Rueter | OHUfx wrote:

I meant QTableView not QStandardTableView :/

On 10/10/13 6:33 PM, Frank Rueter | OHUfx wrote:

Hi all,

after a bit of a break from PySide I am trying to wrap my head around the model/view stuff again and am trying to understand how a very simple example would work where a QStandarItem has properties "title", "priority" and "finished" which are displayed via a QStandardTableView.

I am struggling with understanding how to properly display the above three properties in the table's columns. I tried setting the data() method on the model like this:

    def data(self, index, role=QtCore.Qt.DisplayRole):
        '''Return data based on index and role'''
        item = self.itemFromIndex(index)
        if index.column() == 0:
            return item.title
        elif index.column() == 1:
            return item.finished
        elif index.column() == 2:
            return item.priority

but for some reason it errors saying item does not have attribute "finished" even though my item object s declared like this:

class TaskItem(QtGui.QStandardItem):
    '''Item to hold a task for the todo list'''

    def __init__(self, title, finished=False, priority=1):
        super(TaskItem, self).__init__(title)
        self.title = title
        self.finished = finished
        self.priority = priority

When printing the item's attributes via dir() I see that, when the model is populated, the last item it attempts to call is not my custom item object, but something else with less attributes and methods. Clearly there is something I haven't quite understood about this process.

Also, if I use the models data() method as pointed out above, I get checkboxes in the cells which I don't want at this stage.

Can somebody please help me understand where I go wrong?
Attached is the whole test code.

Cheers,
frank

P.S.: I am aware that the controller code shouldn't necessarily live in the QWidget's methods, this is just for testing which I will clean up once I get how it all connects again

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