Python: PyQt4 Snippets

Have a look at the PyQt4 classes reference.

QTreeView example usage

model = QtGui.QStandardItemModel(5, 2)
for r in range(5):
    for c in range(2):
        item = QtGui.QStandardItem("Row: %d, Column: %d" % (r, c))
        if c == 0:
            for i in range(3):
                child = QtGui.QStandardItem("Item %d" % i)
                child.setEditable(False)
                item.appendRow(child)
        model.setItem(r, c, item)

model.setHorizontalHeaderItem(0, QtGui.QStandardItem("Foo"));
model.setHorizontalHeaderItem(1, QtGui.QStandardItem("Bar-Baz"));
ui.sideTree.setModel(model)

Lockable main window

This is a QMainWindow which close can be locked, and forced to emit a signal instead of just close the window. Useful eg. to ask whether to save changes, etc.

from PyQt4.QtGui import QMainWindow, QMessageBox
from PyQt4.QtCore import SIGNAL

class LockableMainWindow(QMainWindow):
    """Custom main window whit close event lockable

    Custom Methods:
        setCloseable(c)
            True : unlock, False : lock

        lockClose()
            alias for setCloseable(False)

        unlockClose()
            alias for setCloseable(True)

    Custom Signals:
        closeRequested()
            Emitted when trying to close a locked window
    """

    CAN_BE_CLOSED = True

    def setCloseable(self, c=True):
        self.CAN_BE_CLOSED = bool(c)

    def lockClose(self):
        self.setCloseable(False)

    def unlockClose(self):
        self.setCloseable(True)

    def closeEvent(self, event):
        """Handles the close event.
        If window close is locked, ignore the close event and emit
        ``closeRequested()`` signal.
        """
        if not self.CAN_BE_CLOSED:
            event.ignore()
            self.emit(SIGNAL("closeRequested()"))

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