|
public static GetItemsInViewPort ( this list ) : IList |
||
| list | this | The ItemsControl to search on. |
| return | IList |
|
/// <summary>
/// Go through all the items that were not visible on the page and set their properties accordingly without animation.
/// </summary>
private void UpdateOutOfViewItems()
{
IList <WeakReference> itemsInView = ItemsControlExtensions.GetItemsInViewPort(Picker);
for (int k = 0; k < Picker.Items.Count; k++)
{
FrameworkElement item = (FrameworkElement)Picker.ItemContainerGenerator.ContainerFromIndex(k);
if (item != null)
{
bool found = false;
foreach (WeakReference refr in itemsInView)
{
if (refr.Target == item)
{
found = true;
}
}
if (!found)
{
item.Opacity = (IsOpen) ? 1 : 0;
PlaneProjection p = item.Projection as PlaneProjection;
if (null != p)
{
p.RotationX = 0;
}
}
}
}
}
/// <summary>
/// Triggers the visual state changes and visual transitions
/// to close the list out of selection mode.
/// </summary>
private void CloseSelection()
{
IList <WeakReference> items = ItemsControlExtensions.GetItemsInViewPort(this);
//Only animate the containers in the view port.
foreach (var i in items)
{
MultiselectItem item = (MultiselectItem)(((WeakReference)i).Target);
item.State = SelectionEnabledState.Closed;
item.UpdateVisualState(true);
}
Dispatcher.BeginInvoke(() =>
{
for (int j = 0; j < this.Items.Count; j++)
{
MultiselectItem item = (MultiselectItem)ItemContainerGenerator.ContainerFromIndex(j);
if (item != null)
{
item.State = SelectionEnabledState.Closed;
item.UpdateVisualState(false);
}
}
});
}
private void SetupListItems(double degree)
{
_itemsToAnimate = ItemsControlExtensions.GetItemsInViewPort(Picker);
for (int i = 0; i < _itemsToAnimate.Count; i++)
{
FrameworkElement item = (FrameworkElement)_itemsToAnimate[i].Target;
if (null != item)
{
PlaneProjection p = (PlaneProjection)item.Projection;
if (null == p)
{
p = new PlaneProjection();
item.Projection = p;
}
p.RotationX = degree;
}
}
}
private void UpdateVisualState(bool useTransitions)
{
if (useTransitions)
{
if (!IsOpen)
{
SetupListItems(0);
}
Storyboard mainBoard = new Storyboard();
Storyboard headerBoard = AnimationForElement(HeaderTitle, 0);
mainBoard.Children.Add(headerBoard);
IList <WeakReference> itemsInView = ItemsControlExtensions.GetItemsInViewPort(Picker);
for (int i = 0; i < itemsInView.Count; i++)
{
FrameworkElement element = (FrameworkElement)itemsInView[i].Target;
Storyboard board = AnimationForElement(element, i + 1);
mainBoard.Children.Add(board);
}
Dispatcher.BeginInvoke(UpdateOutOfViewItems);
if (!IsOpen)
{
mainBoard.Completed += OnClosedStoryboardCompleted;
}
mainBoard.Begin();
}
else if (!IsOpen)
{
OnClosedStoryboardCompleted(null, null);
}
}
/// <summary>
/// Returns the set of weak references to the items
/// that must be animated.
/// </summary>
/// <returns>
/// A set of weak references to items sorted by their feathering index.
/// </returns>
private static IList <WeakReference> GetTargetsToAnimate()
{
List <WeakReference> references;
List <WeakReference> targets = new List <WeakReference>();
PhoneApplicationPage page = null;
PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
if (frame != null)
{
page = frame.Content as PhoneApplicationPage;
}
if (page == null)
{
return(null);
}
if (!_pagesToReferences.TryGetValue(page, out references))
{
return(null);
}
foreach (WeakReference r in references)
{
FrameworkElement target = r.Target as FrameworkElement;
// If target is null, skip.
if (target == null)
{
continue;
}
// If target is not on the screen, skip.
if (!IsOnScreen(target))
{
continue;
}
ListBox listBox = r.Target as ListBox;
LongListSelector longListSelector = r.Target as LongListSelector;
Pivot pivot = r.Target as Pivot;
if (listBox != null)
{
// If the target is a ListBox, feather its items individually.
ItemsControlExtensions.GetItemsInViewPort(listBox, targets);
}
else if (longListSelector != null)
{
#if WP7
// If the target is a LongListSelector, feather its items individually.
ListBox child = TemplatedVisualTreeExtensions.GetFirstLogicalChildByType <ListBox>(longListSelector, false);
if (child != null)
{
ItemsControlExtensions.GetItemsInViewPort(child, targets);
}
#else
LongListSelectorExtensions.GetItemsInViewPort(longListSelector, targets);
#endif
}
else if (pivot != null)
{
// If the target is a Pivot, feather the title and the headers individually.
ContentPresenter title = TemplatedVisualTreeExtensions.GetFirstLogicalChildByType <ContentPresenter>(pivot, false);
if (title != null)
{
targets.Add(new WeakReference(title));
}
PivotHeadersControl headers = TemplatedVisualTreeExtensions.GetFirstLogicalChildByType <PivotHeadersControl>(pivot, false);
if (headers != null)
{
targets.Add(new WeakReference(headers));
}
}
else
{
// Else, feather the target as a whole.
targets.Add(r);
}
}
return(targets);
}