/// <summary>
/// Returns an observable that wraps the KeyUp event and returns even if
/// one of the events involved is handled or occurs in a sibling.
/// </summary>
/// <param name="that">The element to listen to.</param>
/// <returns>An observable that wraps the KeyUp event and returns even if
/// one of the events involved is handled or occurs in a sibling.</returns>
internal static IObservable <IEvent <KeyEventArgs> > GetKeyUpOnSelfAndSiblingsAlways(this UIElement that)
{
IEnumerable <UIElement> popupRoots =
VisualTreeExtensions.GetVisualDescendants(that)
.OfType <Popup>()
.Select(popup => popup.Child)
.Where(popupRoot => popupRoot != null);
return
(popupRoots
.Select(popupRoot => popupRoot.GetKeyUpAlways())
.Aggregate(that.GetKeyUpAlways(), (left, right) => left.Merge(right)));
}
/// <summary>
/// Returns an observable that returns a SW.DragDropKeyStates value
/// whenever it changes, even if one of the events involved
/// is handled or occurs in a sibling.
/// </summary>
/// <param name="that">The element to listen to.</param>
/// <param name="initialState">The initial state SW.DragDropKeyStates.
/// </param>
/// <returns>An observable that returns a SW.DragDropKeyStates value
/// whenever it changes, even if one of the events involved
/// is handled.</returns>
internal static IObservable <SW.DragDropKeyStates> GetKeyStateChangedOnSelfAndSiblingsAlways(this UIElement that, SW.DragDropKeyStates initialState)
{
IEnumerable <UIElement> popupRoots =
VisualTreeExtensions.GetVisualDescendants(that)
.OfType <Popup>()
.Select(popup => popup.Child)
.Where(popupRoot => popupRoot != null);
return(GetKeyStateChanged(
popupRoots
.Select(popupRoot => popupRoot.GetMouseLeftButtonDownAlways())
.Aggregate(that.GetMouseLeftButtonDownAlways(), (left, right) => left.Merge(right)),
popupRoots
.Select(popupRoot => popupRoot.GetMouseLeftButtonUpAlways())
.Aggregate(that.GetMouseLeftButtonUpAlways(), (left, right) => left.Merge(right)),
popupRoots
.Select(popupRoot => popupRoot.GetKeyUpAlways())
.Aggregate(that.GetKeyUpAlways(), (left, right) => left.Merge(right)),
popupRoots
.Select(popupRoot => popupRoot.GetKeyDownAlways())
.Aggregate(that.GetKeyDownAlways(), (left, right) => left.Merge(right)),
initialState));
}
public override void OnApplyTemplate()
{
if (_scrollViewer != null && IsPullToRefreshEnabled)
{
_scrollViewer.ManipulationStarted -= OnManipulationStarted;
}
if (_top != null)
{
_top.MouseLeftButtonDown -= OnJumpToTop;
}
if (_bottom != null)
{
_bottom.MouseLeftButtonDown -= OnJumpToBottom;
}
_ta = null;
base.OnApplyTemplate();
if (IsPullToRefreshEnabled)
{
SizeChanged += OnSizeChanged;
}
_scrollViewer = MoreVisualTreeExtensions.FindFirstChildOfType <ScrollViewer>(this);
if (null == _scrollViewer)
{
return;
// Must be at design time.
//throw new NotSupportedException("Control Template must include a ScrollViewer.");
}
Dispatcher.BeginInvoke(() =>
{
_top = VisualTreeExtensions.GetVisualDescendants(_scrollViewer).OfType <Rectangle>().Where(b => b.Name == TopJumpName).FirstOrDefault();
_bottom = VisualTreeExtensions.GetVisualDescendants(_scrollViewer).OfType <Rectangle>().Where(b => b.Name == BottomJumpName).FirstOrDefault();
if (_top != null)
{
_top.MouseLeftButtonUp += OnJumpToTop;
}
if (_bottom != null)
{
_bottom.MouseLeftButtonUp += OnJumpToBottom;
}
});
_header = GetTemplateChild("Header") as ContentPresenter;
if (_header != null)
{
TransformYAnimator.EnsureAnimator(_header, ref _ta);
}
if (IsPullToRefreshEnabled)
{
_scrollViewer.ManipulationStarted += OnManipulationStarted;
}
Dispatcher.BeginInvoke(() =>
{
int i = 0;
UIElement uie = Parent as UIElement;
while (i < 8 && uie != null && _piv == null)
{
uie = VisualTreeHelper.GetParent(uie) as UIElement;
_piv = uie as LoadingPivotItem;
}
var implroot = VisualTreeHelper.GetChild(_scrollViewer, 0) as FrameworkElement;
if (implroot != null)
{
VisualStateGroup group = FindVisualState(implroot, "ScrollStates");
if (group != null)
{
group.CurrentStateChanging += OnScrollingStateChanging;
// should probably disconnect too
}
}
this.InvokeOnLayoutUpdated(Bump);
});
}
/// <summary>
/// Retrieves the items host for a given items control.
/// </summary>
/// <param name="itemsControl">The items control.</param>
/// <returns>The items host for a given items control.</returns>
protected override Panel GetItemsHost(DataPointSeries itemsControl)
{
return(VisualTreeExtensions.GetVisualDescendants(itemsControl).OfType <Panel>().FirstOrDefault());
}
