/// <summary>
/// Ensures and creates if needed the animator for an element. Will also
/// verify that a translate transform is present.
/// </summary>
/// <param name="targetElement">The target element.</param>
/// <param name="animator">The animator reference.</param>
public static void EnsureAnimator(FrameworkElement targetElement, ref TransformYAnimator animator)
{
if (animator == null)
{
TranslateTransform transform = TransformYAnimator.GetTranslateTransform(targetElement);
if (transform != null)
{
animator = new TransformYAnimator(transform);
}
}
if (animator == null)
{
throw new InvalidOperationException("The animation system could not be prepared for the target element.");
}
}
/// <summary>
/// Ensures and creates if needed the animator for an element. Will also
/// verify that a translate transform is present.
/// </summary>
/// <param name="targetElement">The target element.</param>
/// <param name="animator">The animator reference.</param>
public static void EnsureAnimator(FrameworkElement targetElement, ref TransformYAnimator animator)
{
if (animator == null)
{
TranslateTransform transform = TransformYAnimator.GetTranslateTransform(targetElement);
if (transform != null)
{
animator = new TransformYAnimator(transform);
}
}
if (animator == null)
{
throw new InvalidOperationException("The animation system could not be prepared for the target element.");
}
}
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);
});
}
public override void OnApplyTemplate()
{
if (_ya != null)
{
_ya = null;
}
if (_pivotItem == null)
{
DependencyObject d = Parent;
while (d != null && !(d is PivotItem))
{
d = VisualTreeHelper.GetParent(d);
}
_pivotItem = d as PivotItem;
}
if (_pivotItem != null && _pivot == null)
{
DependencyObject d = _pivotItem;
while (d != null && !(d is Pivot))
{
d = VisualTreeHelper.GetParent(d);
}
_pivot = d as Pivot;
if (_pivot != null)
{
_pivot.UnloadingPivotItem += OnUnloadingPivotItem;
//_pivot.SelectionChanged += OnPivotSelectionChanged;
}
}
base.OnApplyTemplate();
_image = GetTemplateChild("_image") as Image;
_grid = GetTemplateChild("_grid") as Grid;
TransformYAnimator.EnsureAnimator(_grid, ref _ya);
Debug.Assert(_ya != null);
if (_image != null && ImageSource != null)
{
UpdateImageSource();
}
UpdatePosition(false);
}