[SOLVED] [PyQT] QTableview refuses to grow past specified minimum size.

If I expand a column it will pop a horizontal scroll bar instead of using more screen real estate. Where have I gone wrong? I hope I've included enough info.

Thanks,

Todd

Code:

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class MainWin(QtGui.QMainWindow):
    """
    Inherited from the definition imported from Qt Designer / pyuic construct ThetaMat.ui
    """
    def __init__(self):
        QtGui.QDialog.__init__(self)
        self.ui = Ui_mainWindow()
        self.ui.setupUi(self)
        self.ui.statusbar.showMessage('Welcome')
        self.setWindowState(QtCore.Qt.WindowMaximized)
        self.ui.mdiArea.show()
        self.setCentralWidget(self.ui.mdiArea)
        # remember to setup slots / signals here
        self.ui.actionAbout_ThetaMat.triggered.connect(self.myAbout)
        self.ui.actionView_Current_List.triggered.connect(self.InvGrid)
 
def InvGrid(self):
        # see if we already exist (prevents duplicate windows)
 
        test = self.ui.mdiArea.findChild(QtGui.QWidget, 'InvList')
 
        if test:
            print 'Raising existing Inventory List'
            test.setFocus()
            test.setWindowState(test.windowState() | QtCore.Qt.WindowMaximized)
 
        else:             
            print 'Creating Inventory List'  
            # create a child window for the grid (need the 'X' in the corner!) 
            tableWidget = QtGui.QMdiSubWindow(self.ui.mdiArea)
            tableWidget.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
            tableWidget.setWindowTitle('Current Inventory')
 
            # put a qtableview in the child window
            invTable = QtGui.QTableView(tableWidget)
            invTable.setSortingEnabled(True)
 
            invTable.setMinimumSize(800, 500)
            invTable.setMaximumSize(16777215, 16777215)
            invTable.setColumnWidth(0,80)
            invTable.setColumnWidth(1,250)
            invTable.setColumnWidth(2,40)
            invTable.setColumnWidth(3,80)
            invTable.setColumnWidth(4,45)
            invTable.setColumnWidth(5,80)
            invTable.setColumnWidth(6,80)
            invTable.setColumnWidth(7,45)
            invTable.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
 
 
            # populate the grid
 
            logindb = pyodbc.connect('DSN=MyDSN;PWD=MyPw')
            invcursor = logindb.cursor()
            invcursor.execute('select count (*) from Inventory')
            row = invcursor.fetchone()
            totalrows = row[0]
            print "Total rows in inventory = %i" %(int(totalrows))
            invcursor.execute('select * from Inventory;')
            currenttablerow = 0
            invModel = QtGui.QStandardItemModel(totalrows,8)
 
            for record in invcursor:
                invModel.setItem(currenttablerow, 0, QtGui.QStandardItem(record[0]))
                invModel.setItem(currenttablerow, 1, QtGui.QStandardItem(record[1]))
                invModel.setItem(currenttablerow, 2, QtGui.QStandardItem(str(record[2])))
                invModel.setItem(currenttablerow, 3, QtGui.QStandardItem(record[3]))
                invModel.setItem(currenttablerow, 4, QtGui.QStandardItem(str(record[4])))
                invModel.setItem(currenttablerow, 5, QtGui.QStandardItem(record[5]))
                invModel.setItem(currenttablerow, 6, QtGui.QStandardItem(record[6]))
                invModel.setItem(currenttablerow, 7, QtGui.QStandardItem(record[7]))
                currenttablerow += 1
 
            invModel.setHeaderData(0, QtCore.Qt.Horizontal, 'Category', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(1, QtCore.Qt.Horizontal, 'Item Description', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(2, QtCore.Qt.Horizontal, 'Tray #', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(3, QtCore.Qt.Horizontal, 'Parent Item', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(4, QtCore.Qt.Horizontal, 'Weight', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(5, QtCore.Qt.Horizontal, 'Dimension', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(6, QtCore.Qt.Horizontal, 'Detail #', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(7, QtCore.Qt.Horizontal, 'Material', role=QtCore.Qt.DisplayRole)
 
            invHeader = invTable.horizontalHeader()
 
            self.ui.statusbar.showMessage('Displaying Active Inventory')
            invTable.setModel(invModel)
            invHeader.ResizeMode(QtGui.QHeaderView.Stretch)
            invHeader.setStretchLastSection(True)
            invTable.updateGeometry()
            invTable.showMaximized()
 
            # update the list 
            tableWidget.setObjectName('InvList')
            #show the widget
            tableWidget.setWindowState(tableWidget.windowState() | QtCore.Qt.WindowMaximized)      
            tableWidget.showMaximized()

---

After a careful re-read of the documentation of QMDISubWindow, I noticed that a sub-window has its own 'central widget' (referred to as the internal widget). Adding the table directly to the sub-window (not to mention not parenting everything in an unwieldy chain) solved all the issues I had. :o

Code:

---

# inherit the main ui
class MainWin(QtGui.QMainWindow):
    """
    Inherited from the definition imported from Qt Designer / pyuic construct ThetaMat.ui
    """
    def __init__(self):
        QtGui.QDialog.__init__(self)
        self.ui = Ui_mainWindow()
        self.ui.setupUi(self)
        self.ui.statusbar.showMessage('Welcome')
        self.setWindowState(QtCore.Qt.WindowMaximized)
        self.ui.mdiArea.show()
        self.setCentralWidget(self.ui.mdiArea)
        # remember to setup slots / signals here
        self.ui.actionAbout_ThetaMat.triggered.connect(self.myAbout)
        self.ui.actionView_Current_List.triggered.connect(self.InvGrid)
 
    def InvGrid(self):
        # see if we already exist (prevents duplicate windows)
 
        test = self.ui.mdiArea.findChild(QtGui.QWidget, 'InvList')
 
        if test:
            print 'Raising existing Inventory List'
            test.setFocus()
            test.setWindowState(test.windowState() | QtCore.Qt.WindowMaximized)
 
        else:             
            print 'Creating Inventory List'  
            # create a child window for the grid (need the 'X' in the corner!) 
            print 'creating sub window'
            subWindow = QtGui.QMdiSubWindow(self.ui.mdiArea)
            subWindow.setWindowTitle('Current Inventory')
 
            print 'creating table'
            # put a qtableview in the child window
            invTable = QtGui.QTableView()
            invTable.setSortingEnabled(True)
 
            invTable.setMinimumSize(800, 500)
            invTable.setMaximumSize(16777215, 16777215)
            invTable.setColumnWidth(0,80)
            invTable.setColumnWidth(1,250)
            invTable.setColumnWidth(2,40)
            invTable.setColumnWidth(3,80)
            invTable.setColumnWidth(4,45)
            invTable.setColumnWidth(5,80)
            invTable.setColumnWidth(6,80)
            invTable.setColumnWidth(7,45)
            invTable.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
 
            # populate the grid
            print 'populating table'
            logindb = pyodbc.connect('DSN=MyDSN;PWD=MyPwd')
            invcursor = logindb.cursor()
            invcursor.execute('select count (*) from Inventory')
            row = invcursor.fetchone()
            totalrows = row[0]
            print "Total rows in inventory = %i" %(int(totalrows))
            invcursor.execute('select * from Inventory;')
            currenttablerow = 0
            invModel = QtGui.QStandardItemModel(totalrows,8)
 
            for record in invcursor:
                invModel.setItem(currenttablerow, 0, QtGui.QStandardItem(record[0]))
                invModel.setItem(currenttablerow, 1, QtGui.QStandardItem(record[1]))
                invModel.setItem(currenttablerow, 2, QtGui.QStandardItem(str(record[2])))
                invModel.setItem(currenttablerow, 3, QtGui.QStandardItem(record[3]))
                invModel.setItem(currenttablerow, 4, QtGui.QStandardItem(str(record[4])))
                invModel.setItem(currenttablerow, 5, QtGui.QStandardItem(record[5]))
                invModel.setItem(currenttablerow, 6, QtGui.QStandardItem(record[6]))
                invModel.setItem(currenttablerow, 7, QtGui.QStandardItem(record[7]))
                currenttablerow += 1
 
            invModel.setHeaderData(0, QtCore.Qt.Horizontal, 'Category', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(1, QtCore.Qt.Horizontal, 'Item Description', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(2, QtCore.Qt.Horizontal, 'Tray #', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(3, QtCore.Qt.Horizontal, 'Parent Item', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(4, QtCore.Qt.Horizontal, 'Weight', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(5, QtCore.Qt.Horizontal, 'Dimension', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(6, QtCore.Qt.Horizontal, 'Detail #', role=QtCore.Qt.DisplayRole)
            invModel.setHeaderData(7, QtCore.Qt.Horizontal, 'Material', role=QtCore.Qt.DisplayRole)
 
            invHeader = invTable.horizontalHeader()
            print'updating status bar'
            self.ui.statusbar.showMessage('Displaying Active Inventory')
            invTable.setModel(invModel)
            invHeader.ResizeMode(QtGui.QHeaderView.Stretch)
            invHeader.setStretchLastSection(True)
            print 'show tableWidget'
            # update the list 
            subWindow.setObjectName('InvList')
            subWindow.setWidget(invTable)
            subWindow.showMaximized()

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