/// <summary>
/// Updates the location and size of the Popup and overlay.
/// </summary>
private void UpdateContextMenuPlacement()
{
if ((null != _rootVisual) && (null != _overlay))
{
// Start with the current Popup alignment point
double x = _popupAlignmentPoint.X;
double y = _popupAlignmentPoint.Y;
// Adjust for offset
#if !WINDOWS_PHONE
x += HorizontalOffset;
#endif
y += VerticalOffset;
#if WINDOWS_PHONE
// Determine frame/page bounds
bool portrait = (_rootVisual.Orientation & PageOrientation.Portrait) == PageOrientation.Portrait;
double effectiveWidth = portrait ? _rootVisual.ActualWidth : _rootVisual.ActualHeight;
double effectiveHeight = portrait ? _rootVisual.ActualHeight : _rootVisual.ActualWidth;
Rect bounds = new Rect(0, 0, effectiveWidth, effectiveHeight);
if (_page != null)
{
bounds = _page.TransformToVisual(_rootVisual).TransformBounds(new Rect(0, 0, _page.ActualWidth, _page.ActualHeight));
}
// Left align with full width
x = bounds.Left;
Width = bounds.Width;
// Ensure the bottom is visible / ensure the top is visible
y = Math.Min(y, bounds.Bottom - ActualHeight);
y = Math.Max(y, bounds.Top);
#else
// Try not to let it stick out too far to the right/bottom
x = Math.Min(x, _rootVisual.ActualWidth - ActualWidth);
y = Math.Min(y, _rootVisual.ActualHeight - ActualHeight);
#endif
// Do not let it stick out too far to the left/top
x = Math.Max(x, 0);
y = Math.Max(y, 0);
// Set the new location
Canvas.SetLeft(this, x);
Canvas.SetTop(this, y);
// Size the overlay to match the new container
#if WINDOWS_PHONE
_overlay.Width = effectiveWidth;
_overlay.Height = effectiveHeight;
#else
_overlay.Width = _rootVisual.ActualWidth;
_overlay.Height = _rootVisual.ActualHeight;
#endif
}
}