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"""Action to hold many mode actions, usually for a tool bar.
"""

__authors__ = ["V. Valls"]
__license__ = "MIT"
__data__ = "22/04/2020"


from silx.gui import qt


class MultiModeAction(qt.QWidgetAction):
    """This action provides a default checkable action from a list of checkable
    actions.

    The default action can be selected from a drop down list. The last one used
    became the default one.

    The default action is directly usable without using the drop down list.
    """

    def __init__(self, parent=None):
        assert isinstance(parent, qt.QWidget)
        qt.QWidgetAction.__init__(self, parent)
        button = qt.QToolButton(parent)
        button.setPopupMode(qt.QToolButton.MenuButtonPopup)
        self.setDefaultWidget(button)
        self.__button = button

    def getMenu(self):
        """Returns the menu.

        :rtype: qt.QMenu
        """
        button = self.__button
        menu = button.menu()
        if menu is None:
            menu = qt.QMenu(button)
            button.setMenu(menu)
        return menu

    def addAction(self, action):
        """Add a new action to the list.

        :param qt.QAction action: New action
        """
        menu = self.getMenu()
        button = self.__button
        menu.addAction(action)
        if button.defaultAction() is None:
            button.setDefaultAction(action)
        if action.isCheckable():
            action.toggled.connect(self._toggled)

    def _toggled(self, checked):
        if checked:
            action = self.sender()
            button = self.__button
            button.setDefaultAction(action)
