/// <summary>
/// Start from scratch. This will repair any animation positioning errors.
/// </summary>
private void RedrawCollection()
{
if (_canvas == null)
{
return;
}
_list_of_visuals.Clear();
_canvas.Children.Clear();
if (this.PageStack == null)
{
return;
}
// Create the SingleCrumb classes
for (int i = 0; i < this.PageStack.Count; i++)
{
SmartPage page = this.PageStack[i];
bool isfirst = (i == 0);
var control = new SingleCrumb {
FirstItem = isfirst, Text = page.PageCaption
};
// First Add to the visual tree
_canvas.Children.Add(control);
// Second create the the Visual
BreadCrumbVisual item = new BreadCrumbVisual(control);
// Third, add to the collection of visuals
_list_of_visuals.Add(item);
}
float offset = CalculateOffset();
foreach (var bcv in _list_of_visuals)
{
bcv.Offset = (float)offset;
bcv.CalculatedOffset = (float)offset;
offset += (float)bcv.Width;
}
}
/// <summary>
/// The calculated offset for the first child element inside the Canvas.
/// </summary>
//private float _canvas_offset = 0.0f;
private void PageStack_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
if (e.NewItems.Count != 1)
{
return;
}
SmartPage page = e.NewItems[0] as SmartPage;
bool isfirst = (_canvas.Children.Count == 0);
var control = new SingleCrumb {
FirstItem = isfirst, Text = page.PageCaption
};
// First, add to the visual tree
_canvas.Children.Add(control); // Add the Element to the visual tree
// Second, create the visual
BreadCrumbVisual bcv = new BreadCrumbVisual(control);
float new_offset = CalculateOffset((float)bcv.Width);
ShiftAllElementsToOffset(new_offset, miliseconds_delay: 0); // was 0
// The total width before adding the new element.
double total_width = CalcTotalWidth();
// Third, add to the visuals collection
_list_of_visuals.Add(bcv);
bcv.Offset = new_offset + (float)total_width;
bcv.CalculatedOffset = new_offset + (float)total_width;
var anim = bcv.Compositor.CreateSpringScalarAnimation();
anim.Period = TimeSpan.FromMilliseconds(200); // was 50
anim.DelayBehavior = AnimationDelayBehavior.SetInitialValueBeforeDelay;
anim.DelayTime = TimeSpan.FromMilliseconds(200);
anim.DampingRatio = 0.88f; // 0.2f
anim.StopBehavior = AnimationStopBehavior.SetToFinalValue;
anim.InitialValue = (float)_canvas.ActualWidth;
anim.FinalValue = new_offset + (float)total_width;
//var scopedBatch = bcv.Compositor.CreateScopedBatch(CompositionBatchTypes.Animation);
//scopedBatch.Completed += ScopedBatch_Completed;
bcv.Visual.StartAnimation("Offset.X", anim);
//scopedBatch.End();
//bcv.Offset = (float)total_width - (overflow+(float)bcv.Width);
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
if (e.OldItems.Count != 1)
{
return;
}
SmartPage page_data = e.OldItems[0] as SmartPage;
BreadCrumbVisual bcv = _list_of_visuals[_list_of_visuals.Count - 1];
var anim = bcv.Compositor.CreateSpringScalarAnimation();
anim.Period = TimeSpan.FromSeconds(0.50); // was 0.05
//anim.DelayBehavior = AnimationDelayBehavior.SetInitialValueBeforeDelay;
//anim.DelayTime = TimeSpan.FromMilliseconds(100);
anim.DampingRatio = 0.88f; // 0.2f
anim.StopBehavior = AnimationStopBehavior.SetToFinalValue;
anim.InitialValue = bcv.CalculatedOffset;
anim.FinalValue = (float)_canvas.ActualWidth;
Action action = () =>
{
_canvas.Children.Remove(bcv.Element); // remove from Visual Tree
};
_list_of_visuals.Remove(bcv);
CompositionScopedBatch scopedBatch = bcv.Compositor.CreateScopedBatch(CompositionBatchTypes.Animation);
scopedBatch.Comment = _counter.ToString(); _counter++;
_dictionary.Add(scopedBatch.Comment, action);
scopedBatch.Completed += ScopedBatch_Completed;
bcv.Visual.StartAnimation("Offset.X", anim);
scopedBatch.End();
//bcv.Offset = (float)total_width - (overflow+(float)bcv.Width);
float new_offset = CalculateOffset(); // The offset might have changed as we removed the last item.
ShiftAllElementsToOffset(new_offset, miliseconds_delay: 1200); // was 300
}
else
{
RedrawCollection();
}
}