public void Open(Point mousePos, MenuOrientationTypes orientation, int delay, FrameworkElement triggerElement, bool focusOnShow, MouseEventArgs e) {
ActualTriggerElement = triggerElement;
if (!OverlayPopup.IsOpen && !IsOpening) {
if (this.ItemsControl.DataContext == null)
this.ItemsControl.DataContext = this.DataContext;
OverlayCanvas.Opacity = 0; // Make sure the root grid is hidden before it is correctly positioned
IsOpening = true;
if (Opening != null)
Opening(triggerElement, e);
OverlayPopup.IsOpen = true;
//if (!OpenMenus.Contains(this))
PopupMenuManager.OpenMenus.Insert(0, this); // Add the actual menu on top of the list of open menus
if (ItemsControl is Selector)
(ItemsControl as Selector).SelectedIndex = -1; // Reset selected item in menu
if (ParentOverlapGridBrush != null)
ShowParentOverlapGrid(triggerElement);
ExpandOverlayCanvas(!IsPinned);
// Start opening the menu after the period of time specified by the delay parameter in milliseconds
_timerOpen = new Timer(delegate {
IsOpening = false;
OverlayPopup.Dispatcher.BeginInvoke(delegate() {
// Make sure the menu is still open. This could not be the
// case if the mouse was clicked outside the menu right away.
if (OverlayPopup.IsOpen && triggerElement != null) {
if (!VisualTreeGenerated) // Perform only on first load
{
// Force content layout update
OverlayPopup.IsOpen = false;
OverlayPopup.IsOpen = true;
}
if (Showing != null)
Showing(triggerElement, e);
SetMenuPosition(triggerElement, orientation, mousePos);
Storyboard sbOpen = OpenAnimation ?? PopupMenuUtils.CreateStoryBoard(0, OpenDuration, OverlayCanvas, "UIElement.Opacity", 1, null);
sbOpen.Begin();
sbOpen.Completed += delegate {
if (OverlayCanvas.Opacity == 0) // Just in case sbOpen fails to restore the opacity
OverlayCanvas.Opacity = 1;
if (Shown != null)
Shown.BeginInvoke(triggerElement, e, null, null);
// Make sure the menu stays in view after the open StoryBoard has completed
SetMenuPosition(triggerElement, orientation, mousePos);
};
if (focusOnShow) {
ItemsControl.Focus();
_restoreFocusOnClose = true;
}
VisualTreeGenerated = true;
}
});
}, null, delay, Timeout.Infinite);
}
}
private void SetMenuPosition(FrameworkElement positioningElement, MenuOrientationTypes orientation, Point? mousePos) {
Point ptMargin = mousePos.HasValue ? new Point(mousePos.Value.X + OffsetX, mousePos.Value.Y + OffsetY)
: new Point(Canvas.GetLeft(positioningElement), Canvas.GetTop(positioningElement));
switch (orientation) {
case MenuOrientationTypes.Right:
ptMargin.X += positioningElement.ActualWidth - 1;
break;
case MenuOrientationTypes.Bottom:
ptMargin.Y += positioningElement.ActualHeight;
break;
case MenuOrientationTypes.Left:
ptMargin.X += -ContentRoot.ActualWidth - 1;
break;
case MenuOrientationTypes.Top:
ptMargin.Y += -ContentRoot.ActualHeight;
break;
}
// Make sure the menu stays within root layout bounds
PopupMenuUtils.SetPosition(ContentRoot, ptMargin, true);
}
public void OpenNextTo(FrameworkElement triggerElement, MenuOrientationTypes orientation, bool focusOnShow, bool restoreFocusOnClose) {
Point mousePos = PopupMenuUtils.GetAbsoluteElementPos(PopupMenuManager.ApplicationMenus.Count == 0, triggerElement);
OverlayPopup.IsOpen = IsOpening = false; // Make sure code inside the Open method is not skipped if being called simultaneously
this.Open(mousePos, orientation, 0, triggerElement, focusOnShow, null);
_restoreFocusOnClose = restoreFocusOnClose;
}
