/// <summary>
/// Update all positions. Launch every animations on all items with a unique StoryBoard
/// </summary>
private void UpdatePosition()
{
storyboard = new Storyboard();
isUpdatingPosition = true;
for (int i = 0; i < this.internalList.Count; i++)
{
// Do not animate all items
var inf = this.SelectedIndex - (MaxVisibleItems * 2);
var sup = this.SelectedIndex + (MaxVisibleItems * 2);
if (i < inf || i > sup)
continue;
var item = internalList[i];
PlaneProjection planeProjection = item.Projection as PlaneProjection;
if (planeProjection == null)
continue;
// Get target projection
var props = GetProjection(i, 0d);
// Zindex and Opacity
var deltaFromSelectedIndex = Math.Abs(this.SelectedIndex - i);
int zindex = (this.internalList.Count * 100) - deltaFromSelectedIndex;
Canvas.SetZIndex(item, zindex);
Double opacity = 1d - (Math.Abs((Double)(i - this.SelectedIndex) / (MaxVisibleItems + 1)));
var newVisibility = deltaFromSelectedIndex > MaxVisibleItems
? Visibility.Collapsed
: Visibility.Visible;
// Item already present
if (item.Visibility == newVisibility && item.Visibility == Visibility.Visible)
{
storyboard.AddAnimation(item, TransitionDuration, props.Item1, "(UIElement.Projection).(PlaneProjection.LocalOffsetX)", this.EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, props.Item2, "(UIElement.Projection).(PlaneProjection.GlobalOffsetY)", this.EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, props.Item3, "(UIElement.Projection).(PlaneProjection.GlobalOffsetZ)", this.EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, props.Item4, "(UIElement.Projection).(PlaneProjection.RotationY)", this.EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, opacity, "Opacity", this.EasingFunction);
}
else if (newVisibility == Visibility.Visible)
{
// This animation will occur in the ArrangeOverride() method
item.Visibility = newVisibility;
item.Opacity = 0d;
}
else if (newVisibility == Visibility.Collapsed)
{
storyboard.AddAnimation(item, TransitionDuration, 0d, "Opacity", this.EasingFunction);
storyboard.Completed += (sender, o) =>
item.Visibility = Visibility.Collapsed;
}
}
// When storyboard completed, Invalidate
storyboard.Completed += (sender, o) =>
{
this.isUpdatingPosition = false;
this.InvalidateArrange();
};
storyboard.Begin();
}
/// <summary>
/// Update all positions. Launch every animations on all items with a unique StoryBoard.
/// </summary>
private void UpdatePosition()
{
var storyboard = new Storyboard();
_isUpdatingPosition = true;
for (var i = 0; i < _internalList.Count; i++)
{
// TODO optimize (x2 ?)
// don't animate all items
var inf = SelectedIndex - (MaxVisibleItems * 2);
var sup = SelectedIndex + (MaxVisibleItems * 2);
if (i < inf || i > sup)
{
continue;
}
var item = _internalList[i];
var planeProjection = item.Projection as PlaneProjection;
if (planeProjection == null)
{
continue;
}
// get target projection
var props = GetProjection(i, 0d);
// Zindex and Opacity
var deltaFromSelectedIndex = Math.Abs(SelectedIndex - i);
var zindex = (_internalList.Count * 100) - deltaFromSelectedIndex;
SetZIndex(item, zindex);
var opacity = 1d - (Math.Abs((double)(i - SelectedIndex) / (MaxVisibleItems + 1)));
var newVisibility = deltaFromSelectedIndex > MaxVisibleItems ? Visibility.Collapsed : Visibility.Visible;
// item already present
if (item.Visibility == newVisibility && item.Visibility == Visibility.Visible)
{
storyboard.AddAnimation(item, TransitionDuration, props.Item1, "(UIElement.Projection).(PlaneProjection.LocalOffsetX)", EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, props.Item2, "(UIElement.Projection).(PlaneProjection.GlobalOffsetY)", EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, props.Item3, "(UIElement.Projection).(PlaneProjection.GlobalOffsetZ)", EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, props.Item4, "(UIElement.Projection).(PlaneProjection.RotationY)", EasingFunction);
storyboard.AddAnimation(item, TransitionDuration, opacity, "Opacity", EasingFunction);
}
else switch (newVisibility)
{
case Visibility.Visible:
// this animation will occur in the ArrangeOverride() method
item.Visibility = newVisibility;
item.Opacity = 0d;
break;
case Visibility.Collapsed:
storyboard.AddAnimation(item, TransitionDuration, 0d, "Opacity", EasingFunction);
storyboard.Completed += (sender, o) =>
{
item.Visibility = Visibility.Collapsed;
};
break;
}
}
// start storyboard
// when storyboard completed, InvalidateArrange()
storyboard.Completed += (sender, o) =>
{
_isUpdatingPosition = false;
InvalidateArrange();
};
storyboard.Begin();
}
/// <summary>
/// Arrange all items
/// </summary>
protected override Size ArrangeOverride(Size finalSize)
{
if (isUpdatingPosition)
return finalSize;
Double centerLeft = 0;
Double centerTop = 0;
this.Clip = new RectangleGeometry { Rect = new Rect(0, 0, finalSize.Width, finalSize.Height) };
// Set
Canvas.SetZIndex(rectangle, 1);
// Storyboard for all Items to appear
var localStoryboard = new Storyboard();
for (int i = 0; i < this.internalList.Count; i++)
{
UIElement container = internalList[i];
Size desiredSize = container.DesiredSize;
if (double.IsNaN(desiredSize.Width) || double.IsNaN(desiredSize.Height)) continue;
// get the good center and top position
if (centerLeft == 0 && centerTop == 0 && desiredSize.Width > 0 && desiredSize.Height > 0)
{
desiredWidth = desiredSize.Width;
desiredHeight = desiredSize.Height;
centerLeft = (finalSize.Width / 2) - (desiredWidth / 2);
centerTop = (finalSize.Height - desiredHeight) / 2;
}
// Get position from SelectedIndex
var deltaFromSelectedIndex = Math.Abs(this.SelectedIndex - i);
// Get rect position
var rect = new Rect(centerLeft, centerTop, desiredWidth, desiredHeight);
container.Arrange(rect);
Canvas.SetLeft(container, centerLeft);
Canvas.SetTop(container, centerTop);
// Apply Transform
PlaneProjection planeProjection = container.Projection as PlaneProjection;
if (planeProjection == null)
continue;
// Get an initial projection (without move)
var props = GetProjection(i, 0d);
planeProjection.LocalOffsetX = props.Item1;
planeProjection.GlobalOffsetY = props.Item2;
planeProjection.GlobalOffsetZ = props.Item3;
planeProjection.RotationY = props.Item4;
// calculate zindex and opacity
int zindex = (this.internalList.Count * 100) - deltaFromSelectedIndex;
double opacity = 1d - (Math.Abs((Double)(i - this.SelectedIndex) / (MaxVisibleItems + 1)));
container.Opacity = opacity;
// Item appears
if (container.Visibility == Visibility.Visible && container.Opacity == 0d)
localStoryboard.AddAnimation(container, TransitionDuration, 0, opacity, "Opacity", this.EasingFunction);
else
container.Opacity = opacity;
Canvas.SetZIndex(container, zindex);
}
rectangle.Fill = new SolidColorBrush(Colors.Black);
rectangle.Opacity = 0.9;
Canvas.SetLeft(rectangle, 0);
Canvas.SetTop(rectangle, (this.ActualHeight / 2));
Canvas.SetZIndex(rectangle, 1);
rectangle.Width = this.ActualWidth;
rectangle.Height = this.ActualHeight;
if (localStoryboard.Children.Count > 0)
localStoryboard.Begin();
return finalSize;
}
protected override Size ArrangeOverride(Size finalSize)
{
if (_isUpdatingPosition)
{
return finalSize;
}
var centerLeft = 0.0;
var centerTop = 0.0;
Clip = new RectangleGeometry { Rect = new Rect(0, 0, finalSize.Width, finalSize.Height) };
// storyboard for all items to appear
var localStoryboard = new Storyboard();
for (var i = 0; i < _internalList.Count; i++)
{
var container = _internalList[i];
var desiredSize = container.DesiredSize;
if (double.IsNaN(desiredSize.Width) || double.IsNaN(desiredSize.Height))
{
continue;
}
// get the good center and top position
if (centerLeft == 0 && centerTop == 0 && desiredSize.Width > 0 && desiredSize.Height > 0)
{
_desiredWidth = desiredSize.Width;
_desiredHeight = desiredSize.Height;
centerLeft = (finalSize.Width / 2) - (_desiredWidth / 2);
centerTop = (finalSize.Height - _desiredHeight) / 2;
}
// get delta position from SelectedIndex
var deltaFromSelectedIndex = Math.Abs(SelectedIndex - i);
// get rect position
var rect = new Rect(centerLeft, centerTop, _desiredWidth, _desiredHeight);
container.Arrange(rect);
SetLeft(container, centerLeft);
SetTop(container, centerTop);
// get an initial projection (without move)
// apply transformation
var planeProjection = container.Projection as PlaneProjection;
if (planeProjection == null)
continue;
var props = GetProjection(i, 0d);
planeProjection.LocalOffsetX = props.Item1;
planeProjection.GlobalOffsetY = props.Item2;
planeProjection.GlobalOffsetZ = props.Item3;
planeProjection.RotationY = props.Item4;
// calculate zindex and opacity
var zindex = (_internalList.Count * 100) - deltaFromSelectedIndex;
var opacity = 1d - (Math.Abs((double)(i - SelectedIndex) / (MaxVisibleItems + 1)));
SetZIndex(container, zindex);
container.Opacity = opacity;
// item appearance
if (container.Visibility == Visibility.Visible && container.Opacity == 0.0)
{
localStoryboard.AddAnimation(container, TransitionDuration, 0, opacity, "Opacity", EasingFunction);
}
else
{
container.Opacity = opacity;
}
}
//rectangle.Fill = new SolidColorBrush(Colors.Black);
//rectangle.Opacity = 0.9;
//Canvas.SetLeft(rectangle, 0);
//Canvas.SetTop(rectangle, (this.ActualHeight / 2));
//Canvas.SetZIndex(rectangle, 1);
//rectangle.Width = this.ActualWidth;
//rectangle.Height = this.ActualHeight;
// start storyboard
if (localStoryboard.Children.Count > 0)
{
localStoryboard.Begin();
}
return finalSize;
}
