Using QWidget as a QListView Item



  • I'm currently developing a desktop app using PyQt. As the titles states I'm trying to create a QListView and populate the list using QWidgets as items.

    @"""
    INPUT: data received from QItemDelegate
    OUTPUT: QWidget representation of data
    """
    class ListItem(QtGui.QWidget):

    def __init__(self, *args):
    
        QtGui.QWidget.__init__(self, *args)
    
        self.ui = Ui_ListItem_widget()
        self.ui.setupUi(self)
    
        self.Name = self.ui.Name_label
        self.icon = self.ui.icon_label
    
    def setData(self, Name, iconDir):
    
        # set label text
    
        # set icon images 
    

    """
    Sends data to QWidget and populates it.

    INPUT: object
    OUTPUT: QWidget populated with object data
    """
    class ItemDelegate(QtGui.QItemDelegate):

    def __init__(self, parent=None, *args):
        QtGui.QItemDelegate.__init__(self, parent, *args)
    
        self._itemWidget = ListItem()
    
    # This is where I get stuck.
    # How would I use QItemDelegate to draw a QWidget as a list item?
    def paint(self, painter, option, index):
        painter.save()
        self._itemWidget.setData(#Data to send goes here)
        painter.restore()
    

    """
    Model for views.mainwindow._listview
    Represents the list as a whole

    INPUT: a list of objects
    OUTPUT: ListView of objects
    """
    class ListModel(QtCore.QAbstractListModel):

    def __init__(self, objs=[], parent=None):
        QtCore.QAbstractListModel.__init__(self, parent)
        self._objs = objs
    
    def data(self, index, role):
    
        if role == QtCore.Qt.DisplayRole:
            row = index.row()
            value = self._objs[row]
    
            return value
    
    def rowCount(self, parent):
        return len(self._objs)@
    

    I know this can be done with a QListWidget but I would rather use a MVP approach. The main problem I'm having is drawing the widget using the QItemDelegate. When I run my code I dont get errors but nothing show's on the screen.
    I know I have to implement the sizeHint() method and the paint() method but the documentation is confusing when it comes to these two (since they can be used for much more, I find it to be very general)

    P.S. I can somewhat understand C++ when it comes to Qt so code examples in C++ are fine.


  • Moderators

    your item-delegate's paint method doesn't paint anything.
    Should your widgets in the list view provide interaction? Or should they just be painted/rendered (e.g. labels, ...)?



  • [quote author="raven-worx" date="1368786757"]your item-delegate's paint method doesn't paint anything.
    Should your widgets in the list view provide interaction? Or should they just be painted/rendered (e.g. labels, ...)?[/quote]

    The ListItems should provide interaction as I plan to add buttons and editors, though for right now I only have mostly a skeleton.
    I dont know how to properly implement the paint() method so that I can draw a QWidget using index.data() or by passing index.data to the widget before drawing.


  • Moderators

    well when you just paint them there wont be any interaction possible ;)

    Your possibilities:

    implement "QstyledItemDelegate::createEditor()":http://qt-project.org/doc/qt-4.8/qstyleditemdelegate.html#createEditor and return your widget there and "enable edititing":http://qt-project.org/doc/qt-4.8/qabstractitemview.html#edit on all items in the list-view

    use "QAbstractItemView::setIndexWidget()":http://qt-project.org/doc/qt-4.8/qabstractitemview.html#setIndexWidget

    Which raises up a question in my mind. Why do you use a QListView in first place? Is your ListView just displaying the widgets and nothing more?
    If so you should use a simple QScrollArea and place a simple QWidget inside it. This widget arranges all your widgets with a layout as a "list".



  • Thanks for the help! I was reading up in setIndexWidget() earlier but wasnt sure if that was what I wanted.

    Also, from what I had read you wouldn't be able to add button signals or editors without using the QListView. I tried using QScrollArea earlier and it didn't seem to have that functionality but I admit I didn't look much into.

    I guess I'm just used to always using QListViews and Models at this point :)
    Thanks again


  • Moderators

    [quote author="cogdissonance" date="1368789964"]Also, from what I had read you wouldn’t be able to add button signals or editors without using the QListView[/quote]
    please show me the text where you read that! :)


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.