private void UpdateRoller()
{
if (RenderSize.Height == 0)
{
return;
}
var offset = RenderSize.Height / 2;
if (Items.Count > 0)
{
if (SelectedIndex < 0)
{
var firstItem = GetItem(0) as UIElement;
if (firstItem != null)
{
offset += firstItem.RenderSize.Height / 2;
}
}
for (var i = 0; i <= SelectedIndex; i++)
{
var targetItem = GetItem(i) as UIElement;
if (targetItem != null)
{
if (SelectedIndex == i)
{
offset -= targetItem.RenderSize.Height / 2;
}
else
{
offset -= targetItem.RenderSize.Height;
}
}
}
if (IsLoaded)
{
UIElementUtils.BeginAnimation(_stkPanel, StackPanel.MarginProperty, new Thickness(0, offset, 0, 0), AnimationDuration, AnimationEase, false);
}
else
{
_stkPanel.Margin = new Thickness(0, offset, 0, 0);
}
}
}
private void UpdateState()
{
if (!IsInitialized)
{
return;
}
switch (ContentPlacement)
{
case DrawerPlacement.Left:
case DrawerPlacement.Right:
if (double.IsNaN(MaxWidth))
{
throw new Exception("Drawer Exception : value of MaxWidth property can not be Auto.");
}
if (!IsLoaded || AnimationDuration.TotalMilliseconds == 0)
{
if (IsOpen)
{
if (!double.IsInfinity(MaxWidth))
{
Width = MaxWidth;
}
}
else
{
Width = 0;
}
}
else
{
if (IsOpen)
{
if (double.IsNaN(Width))
{
Width = ActualWidth;
}
UIElementUtils.BeginAnimation(this, WidthProperty, MaxWidth, AnimationDuration, AnimationEase);
}
else
{
if (double.IsNaN(Width))
{
Width = ActualWidth;
}
UIElementUtils.BeginAnimation(this, WidthProperty, 0, AnimationDuration, AnimationEase);
}
}
break;
case DrawerPlacement.Top:
case DrawerPlacement.Bottom:
if (double.IsNaN(MaxWidth))
{
throw new Exception("Drawer Exception : value of MaxHeight property can not be Auto.");
}
if (!IsLoaded || AnimationDuration.TotalMilliseconds == 0)
{
if (IsOpen)
{
if (!double.IsInfinity(MaxHeight))
{
Height = MaxHeight;
}
}
else
{
Height = 0;
}
}
else
{
if (IsOpen)
{
if (double.IsNaN(Height))
{
Height = ActualHeight;
}
UIElementUtils.BeginAnimation(this, HeightProperty, MaxHeight, AnimationDuration, AnimationEase);
}
else
{
if (double.IsNaN(Height))
{
Height = ActualHeight;
}
UIElementUtils.BeginAnimation(this, HeightProperty, 0, AnimationDuration, AnimationEase);
}
}
break;
}
}
private void Tore(int oldIndex, int newIndex, bool useAnimate)
{
if (!IsInitialized)
{
return;
}
var totalCount = Children.Count;
if (oldIndex < 0 || newIndex < 0 || oldIndex > totalCount || newIndex > totalCount)
{
return;
}
var isUpward = newIndex > oldIndex;
var oldChild = Children[oldIndex];
var newChild = Children[newIndex];
newChild.Opacity = 0;
newChild.IsHitTestVisible = true;
oldChild.RenderTransformOrigin = new Point(0.5, 0.5);
newChild.RenderTransformOrigin = new Point(0.5, 0.5);
switch (Animation)
{
case StickyAnimation.Scale:
var oldScale = new ScaleTransform()
{
ScaleX = 1, ScaleY = 1
};
var newScale = new ScaleTransform()
{
ScaleX = isUpward ? 1.5 : 0.75, ScaleY = isUpward ? 1.5 : 0.75
};
oldChild.RenderTransform = oldScale;
oldChild.IsHitTestVisible = false;
newChild.RenderTransform = newScale;
UIElementUtils.BeginAnimation(oldScale, ScaleTransform.ScaleXProperty, isUpward ? 0.75 : 1.5, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(oldScale, ScaleTransform.ScaleYProperty, isUpward ? 0.75 : 1.5, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(oldChild, OpacityProperty, 0, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(newScale, ScaleTransform.ScaleXProperty, 1, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(newScale, ScaleTransform.ScaleYProperty, 1, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(newChild, OpacityProperty, 1, AnimationDuration, AnimationEase);
break;
case StickyAnimation.Slide:
if (isUpward)
{
var oldTranslate = new TranslateTransform()
{
X = 0
};
oldChild.RenderTransform = oldTranslate;
UIElementUtils.BeginAnimation(oldTranslate, TranslateTransform.XProperty, -ActualWidth, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(newChild, OpacityProperty, 1, AnimationDuration, AnimationEase);
}
else
{
var newTranslate = new TranslateTransform()
{
X = -ActualWidth
};
newChild.RenderTransform = newTranslate;
oldChild.IsHitTestVisible = false;
UIElementUtils.BeginAnimation(newTranslate, TranslateTransform.XProperty, 0, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(newChild, OpacityProperty, 1, AnimationDuration, AnimationEase);
UIElementUtils.BeginAnimation(oldChild, OpacityProperty, 0, AnimationDuration, AnimationEase);
}
break;
}
}