public static FrameworkElement GetPlacementParent(Windows.Popup popup)
{
//popup.AssertNotNull("popup");
return popup.GetValue(PlacementParentProperty) as FrameworkElement;
}
public PopupWatcher(Windows.Popup popup)
{
this.popup = popup;
}
public static void SetPlacementChild(Windows.Popup popup, FrameworkElement placementChild)
{
//popup.AssertNotNull("popup");
popup.SetValue(PlacementChildProperty, placementChild);
}
private static void InvalidatePosition(Windows.Popup popup)
{
if (popup.IsOpen)
PositionPopup(popup);
popup.Opened -= OnPopupOpened;
popup.Opened += OnPopupOpened;
var child = GetPlacementChild(popup) ?? popup.Child as FrameworkElement;
if (child != null)
{
SetPopup(child, popup);
child.SizeChanged -= OnChildSizeChanged;
child.SizeChanged += OnChildSizeChanged;
}
}
private static FrameworkElement FindHighestAncestor(Windows.Popup popup)
{
var ancestor = (FrameworkElement)popup;
while (true)
{
var parent = VisualTreeHelper.GetParent(ancestor) as FrameworkElement;
if (parent == null)
return ancestor;
ancestor = parent;
}
}
private static void PositionPopup(Windows.Popup popup)
{
var parent = popup.Parent as FrameworkElement;
var placementParent = GetPlacementParent(popup) ?? popup.Parent as FrameworkElement;
var placementChild = GetPlacementChild(popup) ?? popup.Child as FrameworkElement;
if (parent == null || placementParent == null || placementChild == null)
return;
var preferredOrientations = GetPreferredOrientations(popup) ?? Enumerable.Empty<PopupOrientation>();
foreach (var preferredOrientation in preferredOrientations)
{
if (TryPlacePopup(popup, parent, placementParent, placementChild, preferredOrientation))
return;
}
var fallbackOrientations = from placement in popupPlacements
from horizontalAlignment in horizontalAlignments
from verticalAlignment in verticalAlignments
where preferredOrientations.FirstOrDefault(x => x.Placement == placement && x.HorizontalAlignment == horizontalAlignment && x.VerticalAlignment == verticalAlignment) == null
select new PopupOrientation() { Placement = placement, HorizontalAlignment = horizontalAlignment, VerticalAlignment = verticalAlignment };
foreach (var fallbackOrientation in fallbackOrientations)
{
if (TryPlacePopup(popup, parent, placementParent, placementChild, fallbackOrientation))
return;
}
// give up and just use the first preferred orientation, if any
var orientation = GetPreferredOrientations(popup).FirstOrDefault();
if (orientation != null)
SetActualOrientation(popup, orientation);
}
private static bool TryPlacePopup(Windows.Popup popup, FrameworkElement parent, FrameworkElement placementParent, FrameworkElement placementChild, PopupOrientation orientation)
{
var availableWidth = placementParent.ActualWidth;
var availableHeight = placementParent.ActualHeight;
SetActualOrientation(popup, orientation);
placementChild.Measure(new Size(availableWidth, availableHeight));
var requiredWidth = placementChild.DesiredSize.Width;
var requiredHeight = placementChild.DesiredSize.Height;
var placementTarget = GetPlacementTarget(popup) ?? parent;
var parentTransform = placementTarget.TransformToVisual(parent);
var popupLocation = parentTransform.Transform(new Point(0, 0));
switch (orientation.Placement)
{
case PopupPlacement.Top:
popupLocation.Y -= requiredHeight;
break;
case PopupPlacement.Bottom:
popupLocation.Y += placementTarget.ActualHeight;
break;
case PopupPlacement.Left:
popupLocation.X -= requiredWidth;
break;
case PopupPlacement.Right:
popupLocation.X += placementTarget.ActualWidth;
break;
}
if (orientation.Placement == PopupPlacement.Top || orientation.Placement == PopupPlacement.Bottom)
{
switch (orientation.HorizontalAlignment)
{
case PopupHorizontalAlignment.RightCenter:
popupLocation.X += ((placementTarget.ActualWidth / 2) - requiredWidth);
break;
case PopupHorizontalAlignment.Center:
popupLocation.X += ((placementTarget.ActualWidth - requiredWidth) / 2);
break;
case PopupHorizontalAlignment.LeftCenter:
popupLocation.X += (placementTarget.ActualWidth / 2);
break;
case PopupHorizontalAlignment.Right:
popupLocation.X += (placementTarget.ActualWidth - requiredWidth);
break;
}
}
if (orientation.Placement == PopupPlacement.Left || orientation.Placement == PopupPlacement.Right)
{
switch (orientation.VerticalAlignment)
{
case PopupVerticalAlignment.BottomCenter:
popupLocation.Y += ((placementTarget.ActualHeight / 2) - requiredHeight);
break;
case PopupVerticalAlignment.Center:
popupLocation.Y += ((placementTarget.ActualHeight - requiredHeight) / 2);
break;
case PopupVerticalAlignment.TopCenter:
popupLocation.Y += (placementTarget.ActualHeight / 2);
break;
case PopupVerticalAlignment.Bottom:
popupLocation.Y += (placementTarget.ActualHeight - requiredHeight);
break;
}
}
var popupLocationRelativeToPlacementParent = popupLocation;
if (parent != placementParent)
{
var placementParentTransform = placementTarget.TransformToVisual(placementParent);
popupLocationRelativeToPlacementParent = placementParentTransform.Transform(popupLocation);
}
if (popupLocationRelativeToPlacementParent.X < 0
|| popupLocationRelativeToPlacementParent.Y < 0
|| (popupLocationRelativeToPlacementParent.X + requiredWidth) > availableWidth
|| (popupLocationRelativeToPlacementParent.Y + requiredHeight) > availableHeight)
{
// not enough room
return false;
}
popup.HorizontalOffset = popupLocation.X;
popup.VerticalOffset = popupLocation.Y;
return true;
}
public static void SetStaysOpen(Windows.Popup popup, bool staysOpen)
{
//popup.AssertNotNull("popup");
popup.SetValue(StaysOpenProperty, staysOpen);
}
private static void SetPopup(DependencyObject dependencyObject, Windows.Popup popup)
{
//popup.AssertNotNull("popup");
dependencyObject.SetValue(PopupProperty, popup);
}
public static bool GetStaysOpen(Windows.Popup popup)
{
//popup.AssertNotNull("popup");
return (bool)popup.GetValue(StaysOpenProperty);
}
public static void SetActualOrientation(Windows.Popup popup, PopupOrientation orientation)
{
//popup.AssertNotNull("popup");
popup.SetValue(ActualOrientationProperty, orientation);
}
public static PopupOrientation GetActualOrientation(Windows.Popup popup)
{
//popup.AssertNotNull("popup");
return popup.GetValue(ActualOrientationProperty) as PopupOrientation;
}
public static void SetPreferredOrientations(Windows.Popup popup, PopupOrientationCollection orientations)
{
//popup.AssertNotNull("popup");
popup.SetValue(PreferredOrientationsProperty, orientations);
}
public static PopupOrientationCollection GetPreferredOrientations(Windows.Popup popup)
{
//popup.AssertNotNull("popup");
return popup.GetValue(PreferredOrientationsProperty) as PopupOrientationCollection;
}
