private UIElement GetTargetElement()
{
UIElement element = null;
if (GameControlService.GetIsExternalContentSupported(this))
{
element = this;
}
else if (VisualTreeHelper.GetChildrenCount(this) > 0)
{
// Look for a UIElement that is the child of the ContentPresenter (this will normally be a Button)
var presenter = VisualTreeHelper.GetChild(this, 0) as ContentPresenter;
if (presenter != null && VisualTreeHelper.GetChildrenCount(presenter) > 0)
{
element = VisualTreeHelper.GetChild(presenter, 0) as UIElement;
}
}
return(element ?? this);
}
protected override void OnContentChanged(object oldContent, object newContent)
{
base.OnContentChanged(oldContent, newContent);
if (oldContent is DependencyObject)
{
BindingOperations.ClearBinding(this, PopupControlService.IsPopupOpenProperty);
BindingOperations.ClearBinding(this, IsContentEnabledProperty);
BindingOperations.ClearBinding(this, VisibilityProperty);
// If the menu item's external content properties were bound, clear the bindings
if (GameControlService.GetIsExternalContentSupported(this))
{
BindingOperations.ClearBinding(this, GameControlService.ImageSourceLargeProperty);
BindingOperations.ClearBinding(this, GameControlService.ImageSourceSmallProperty);
BindingOperations.ClearBinding(this, GameControlService.LabelProperty);
}
}
var newContentObj = newContent as DependencyObject;
if (newContentObj != null)
{
// Update the IsTabStop property based on whether the child item keeps highlighted when focused
IsTabStop = !CanUnhighlightWhenFocused(newContentObj);
// Bind to IsPopupOpen
var binding = new Binding
{
Mode = BindingMode.TwoWay,
Source = newContent,
Path = new PropertyPath(PopupControlService.IsPopupOpenProperty)
};
SetBinding(PopupControlService.IsPopupOpenProperty, binding);
if (newContent is UIElement)
{
// Bind to IsEnabled
binding = new Binding
{
Source = newContent,
Path = new PropertyPath("IsEnabled")
};
SetBinding(IsContentEnabledProperty, binding);
// Bind to Visibility
binding = new Binding
{
Source = newContent,
Path = new PropertyPath("Visibility")
};
SetBinding(VisibilityProperty, binding);
}
// Tell the menu item whether external content is supported based on the content's settings
var isExternalContentSupported = GameControlService.GetIsExternalContentSupported(newContentObj);
GameControlService.SetIsExternalContentSupported(this, isExternalContentSupported);
if (isExternalContentSupported)
{
// Configure bindings
binding = new Binding
{
Source = newContent,
Path = new PropertyPath(GameControlService.ImageSourceLargeProperty)
};
SetBinding(GameControlService.ImageSourceLargeProperty, binding);
binding = new Binding
{
Source = newContent,
Path = new PropertyPath(GameControlService.ImageSourceSmallProperty)
};
SetBinding(GameControlService.ImageSourceSmallProperty, binding);
binding = new Binding
{
Source = newContent,
Path = new PropertyPath(GameControlService.LabelProperty)
};
SetBinding(GameControlService.LabelProperty, binding);
}
}
else
{
GameControlService.SetIsExternalContentSupported(this, false);
}
}