private void PerformPlacement(double horizontalOffset, double verticalOffset)
{
double x = 0.0;
double y = 0.0;
PlacementMode placement = this.Placement;
FrameworkElement element = this.PlacementTarget as FrameworkElement;
bool isRTL = (element != null) ? (element.FlowDirection == Windows.UI.Xaml.FlowDirection.RightToLeft) : false;
if ((element != null) && !element.IsHitTestVisible)
{
return;
}
switch (placement)
{
case PlacementMode.Bottom:
case PlacementMode.Left:
case PlacementMode.Right:
case PlacementMode.Top:
Point[] target = GetTransformedPoints(element, isRTL, element);
Point[] menu = GetTransformedPoints((FrameworkElement)_hostPopup.Child, isRTL, element);
if (menu[0].X > menu[1].X)
{
return;
}
Point p2 = PlacePopup(_windowBounds, target, menu, placement);
x = p2.X;
if (isRTL)
{
// TODO: Handle RTL - PerformPlacement
//x = _windowBounds.Width - x;
//this._hostPopup.VerticalOffset = y;
//this._hostPopup.HorizontalOffset = x;
//return;
}
y = p2.Y;
break;
case PlacementMode.Mouse:
throw new NotImplementedException("Mouse PlacementMode is not implemented.");
}
if (x < 0.0) x = 0.0;
if (y < 0.0) y = 0.0;
var calcH = this.CalculateHorizontalCenterOffset(x, ((FrameworkElement)_hostPopup.Child).ActualWidth, element.ActualWidth);
var calcY = this.CalculateVerticalCenterOffset(y, ((FrameworkElement)_hostPopup.Child).ActualHeight, element.ActualHeight);
if (calcH < 0)
{
calcH = GUTTER_BUFFER;
}
else
{
// TODO: Correct right nudge positioning as it is incorrect
if ((calcH > _windowBounds.Width) || (calcH + ((FrameworkElement)_hostPopup.Child).ActualWidth) > _windowBounds.Width)
{
calcH = _windowBounds.Width - ((FrameworkElement)_hostPopup.Child).ActualWidth - GUTTER_BUFFER;
}
}
_hostPopup.HorizontalOffset = calcH;
_hostPopup.VerticalOffset = calcY;
_hostPopup.IsHitTestVisible = true;
_hostPopup.Opacity = 1;
// for entrance animation
// UX guidelines show a PopIn animation
Storyboard inAnimation = new Storyboard();
PopInThemeAnimation popin = new PopInThemeAnimation();
// TODO: Switch statement begs of refactoring
switch (this.Placement)
{
case PlacementMode.Bottom:
popin.FromVerticalOffset = -10;
popin.FromHorizontalOffset = 0;
break;
case PlacementMode.Left:
popin.FromVerticalOffset = 0;
popin.FromHorizontalOffset = 10;
break;
case PlacementMode.Right:
popin.FromVerticalOffset = 0;
popin.FromHorizontalOffset = -10;
break;
case PlacementMode.Top:
popin.FromVerticalOffset = 10;
popin.FromHorizontalOffset = 0;
break;
}
Storyboard.SetTarget(popin, _hostPopup);
inAnimation.Children.Add(popin);
inAnimation.Begin();
}
private void OnContextMenuOpened(object sender, object e)
{
if (this.m_contextMenuPopup.ActualHeight == 0 || this.m_contextMenuPopup.ActualWidth == 0)
{
SizeChangedEventHandler updatePosition = null;
updatePosition = (s, sizeChangedEventArgs) =>
{
if (sizeChangedEventArgs.NewSize.Width != 0 && sizeChangedEventArgs.NewSize.Height != 0)
{
OnContextMenuOpened(s, sizeChangedEventArgs);
SizeChanged -= updatePosition;
}
};
SizeChanged += updatePosition;
}
this.m_contextMenuPopup.HorizontalOffset = this.HorizontalOffset;
this.m_contextMenuPopup.VerticalOffset = this.VerticalOffset;
this.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
UIElement root = Window.Current.Content;
if (root != null)
{
GeneralTransform transform = this.PlacementTarget.TransformToVisual(root);
Point relativeSourceLocation = transform.TransformPoint(new Point(0, 0));
Rect bounds = Window.Current.Bounds;
double horizondalOffset = 0;
double verticalOffset = 0;
horizondalOffset = Math.Min(relativeSourceLocation.X + (this.PlacementTarget.ActualWidth / 2) - (this.PlacementTarget.ActualWidth / 2), bounds.Width - this.m_contextMenuPopup.ActualWidth - 5);
horizondalOffset = Math.Max(5, horizondalOffset - 2);
verticalOffset = Math.Min(relativeSourceLocation.Y + (this.PlacementTarget.ActualHeight / 2) - (this.PlacementTarget.ActualHeight / 2), bounds.Height - this.PlacementTarget.ActualHeight - 5);
verticalOffset = Math.Max(5, verticalOffset - 1);
// for entrance animation
// UX guidelines show a PopIn animation
Storyboard inAnimation = new Storyboard();
PopInThemeAnimation popInThemeAnimation = new PopInThemeAnimation();
switch (this.Placement)
{
case Windows.UI.Popups.Placement.Left:
popInThemeAnimation.FromVerticalOffset = 0;
popInThemeAnimation.FromHorizontalOffset = 10;
horizondalOffset = relativeSourceLocation.X - 2;
break;
case Windows.UI.Popups.Placement.Below:
popInThemeAnimation.FromVerticalOffset = -10;
popInThemeAnimation.FromHorizontalOffset = 0;
verticalOffset = Math.Min(relativeSourceLocation.Y + this.PlacementTarget.ActualHeight - 1, bounds.Height - ((FrameworkElement)this.m_contextMenuPopup.Child).ActualHeight - 5);
break;
default:
popInThemeAnimation.FromVerticalOffset = 10;
popInThemeAnimation.FromHorizontalOffset = 0;
verticalOffset = Math.Max(5, relativeSourceLocation.Y - ((FrameworkElement)this.m_contextMenuPopup.Child).ActualHeight - 1);
break;
}
this.m_contextMenuPopup.HorizontalOffset = horizondalOffset;
this.m_contextMenuPopup.VerticalOffset = verticalOffset;
this.m_contextMenuPopup.Opacity = 1;
Storyboard.SetTarget(popInThemeAnimation, this.m_contextMenuPopup);
inAnimation.Children.Add(popInThemeAnimation);
inAnimation.Begin();
}
}