using System.Windows;
using System.Windows.Media;
using System.Linq;
using Microsoft.Phone.Controls;
namespace Ailon.Phone.Tools
{
public static class ObstructionDetector
{
public static PhoneApplicationPage GetPage(DependencyObject target)
{
var parent = VisualTreeHelper.GetParent(target);
while (parent != null && !(parent is PhoneApplicationPage))
{
parent = VisualTreeHelper.GetParent(parent);
}
return (parent as PhoneApplicationPage);
}
public static PhoneApplicationFrame GetFrame(DependencyObject target)
{
var parent = VisualTreeHelper.GetParent(target);
while (parent != null && !(parent is PhoneApplicationFrame))
{
parent = VisualTreeHelper.GetParent(parent);
}
return (parent as PhoneApplicationFrame);
}
public static Rect TransformBoundsToPortrait(Rect bounds, PhoneApplicationPage page)
{
if ((page.Orientation & PageOrientation.Portrait) > 0)
{
return bounds;
}
else
{
Rect result;
if (page.Orientation == PageOrientation.LandscapeLeft)
{
result = new Rect(bounds.Y, bounds.X, bounds.Height, bounds.Width);
}
else
{
result = new Rect(bounds.Y, 800 - bounds.X - bounds.Width, bounds.Height, bounds.Width);
}
return result;
}
}
public static bool IsElementObstructed(FrameworkElement target)
{
var page = GetPage(target);
var frame = GetFrame(target);
var transform = target.TransformToVisual(frame);
var rect = TransformBoundsToPortrait(transform.TransformBounds(new Rect(0, 0, target.ActualWidth, target.ActualHeight)), page);
var covers = VisualTreeHelper.FindElementsInHostCoordinates(rect, page);
if (covers != null && covers.Count() > 0)
{
return !IsElementChildOf(covers.First(), target);
}
return false;
}
public static bool IsElementChildOf(DependencyObject element, DependencyObject parent)
{
var current = element;
while (current != null)
{
if (current == parent)
{
return true;
}
current = VisualTreeHelper.GetParent(current);
}
return false;
}
}
}
