private static void OnIsModalChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ModalContentPresenter control = (ModalContentPresenter)d;
if ((bool)e.NewValue == true)
{
/*
* Cache the keyboard navigation mode of the primary content before setting it to
* 'none' so that it can be restored when the modal content is hidden.
*/
control.cachedTabNavigationMode = KeyboardNavigation.GetTabNavigation(control.primaryContentPresenter);
control.cachedDirectionalNavigationMode = KeyboardNavigation.GetDirectionalNavigation(control.primaryContentPresenter);
control.cachedFocusedElement = Keyboard.FocusedElement;
KeyboardNavigation.SetTabNavigation(control.primaryContentPresenter, KeyboardNavigationMode.None);
KeyboardNavigation.SetDirectionalNavigation(control.primaryContentPresenter, KeyboardNavigationMode.None);
/*
* Show the overlay (which in turn shows the modal content as it is a child of
* the overlay) and move focus to the first logical element.
*/
control.overlay.Visibility = Visibility.Visible;
control.overlay.MoveFocus(traversalDirection);
control.RaiseModalContentShownEvents();
}
else
{
/*
* Hide the overlay (which also hides the modal content...).
*/
control.overlay.Visibility = Visibility.Hidden;
/*
* Restore the cached keyboard navigation value on the primary content and move
* focus to its first logical element.
*/
KeyboardNavigation.SetTabNavigation(control.primaryContentPresenter, control.cachedTabNavigationMode);
KeyboardNavigation.SetDirectionalNavigation(control.primaryContentPresenter, control.cachedDirectionalNavigationMode);
Keyboard.Focus(control.cachedFocusedElement);
control.primaryContentPresenter.MoveFocus(traversalDirection);
control.RaiseModalContentHiddenEvents();
}
}
private static void OnModalContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ModalContentPresenter control = (ModalContentPresenter)d;
/*
* If the ModalContentPresenter already contains modal content then
* the existing content will need to be removed from the logical tree.
*/
if (e.OldValue != null)
{
control.RemoveLogicalChild(e.OldValue);
}
/*
* Add the new content to the logical tree of the ModalContentPresenter
* and update the logicalChildren array so that the correct element is returned
* when it is requested by WPF.
*/
control.modalContentPresenter.Content = e.NewValue;
control.AddLogicalChild(e.NewValue);
control.logicalChildren[1] = e.NewValue;
}
private static void OnOverlayBrushChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ModalContentPresenter control = (ModalContentPresenter)d;
control.overlay.Background = (Brush)e.NewValue;
}
