private void Items_CollectionChanged(object sender, EventArgs e)
{
if (itemCount != lstBoxMem.Items.Count)
{
count++;
if (count % 2 == 0)
{
ListBoxItem firstItem = (ListBoxItem)lstBoxMem.ItemContainerGenerator.ContainerFromIndex(0);
firstItem.Opacity = 0;
if (count == 4)
{
DoubleAnimation heightAnimation = new DoubleAnimation();
heightAnimation.From = 0;
heightAnimation.To = firstItem.ActualHeight;
heightAnimation.Duration = TimeSpan.FromSeconds(0);
heightAnimation.BeginTime = TimeSpan.FromSeconds(0.3);
firstItem.BeginAnimation(HeightProperty, heightAnimation);
DoubleAnimation opacityAnimation = new DoubleAnimation();
opacityAnimation.From = 0;
opacityAnimation.To = 1;
opacityAnimation.Duration = TimeSpan.FromSeconds(0.3);
opacityAnimation.BeginTime = TimeSpan.FromSeconds(0.3);
firstItem.BeginAnimation(OpacityProperty, opacityAnimation);
ThicknessAnimation marginAnimation = new ThicknessAnimation();
marginAnimation.From = new Thickness(-5, 0, 5, 0);
marginAnimation.To = new Thickness(-5, 0, 0, 0);
marginAnimation.Duration = TimeSpan.FromSeconds(0.3);
marginAnimation.BeginTime = TimeSpan.FromSeconds(0.3);
firstItem.BeginAnimation(MarginProperty, marginAnimation);
itemCount = lstBoxMem.Items.Count;
count = 0;
}
}
}
}
private void AddHistoryItem(ListBoxItem item)
{
if (ListBoxHistory.Items.Count > 8)
{
ListBoxHistory.Items.RemoveAt(0);
}
DoubleAnimation anim = new DoubleAnimation(0, new Duration(TimeSpan.FromSeconds(2)));
anim.BeginTime = TimeSpan.FromSeconds(Properties.Settings.Default.ConsoleFadeTime);
item.HorizontalContentAlignment = HorizontalAlignment.Right;
item.VerticalContentAlignment = VerticalAlignment.Center;
ListBoxHistory.Items.Add(item);
item.BeginAnimation(OpacityProperty, anim);
}
public void OnPrevious()
{
if (_view == null || _view.Count <= NewsPerPage)
{
return;
}
if (_animationStarted)
{
return;
}
_animationStarted = true;
ListBoxItem element = (ListBoxItem)_listSelector.ItemContainerGenerator.ContainerFromItem(_view.FirstOrDefault());
double itemheight = 0;
if (element != null)
{
itemheight = element.ActualHeight + element.Margin.Top + element.Margin.Bottom;
if (itemheight == 0)
{
itemheight = 20;
}
}
else
{
return;
}
_view.Move(_view.Count - 1, 0);
//TODO: need to optimize the animation
ListBoxItem firstelement = (ListBoxItem)_listSelector.ItemContainerGenerator.ContainerFromItem(_view.FirstOrDefault());
DoubleAnimation heightAnimation = new DoubleAnimation(0, itemheight, TimeSpan.FromSeconds(0.5));
heightAnimation.FillBehavior = FillBehavior.HoldEnd;
heightAnimation.Completed += (s, e) =>
{
_animationStarted = false;
};
firstelement.BeginAnimation(ListBoxItem.HeightProperty, heightAnimation);
if (_isItemsUpdate)
{
_isItemsUpdate = false;
}
}
public void OnNext()
{
if (_view == null || _view.Count <= NewsPerPage)
{
return;
}
if (_animationStarted)
{
return;
}
_animationStarted = true;
ListBoxItem element = (ListBoxItem)_listSelector.ItemContainerGenerator.ContainerFromItem(_view.FirstOrDefault());
double itemheight = 0;
if (element != null)
{
itemheight = element.ActualHeight + element.Margin.Top + element.Margin.Bottom;
if (itemheight == 0)
{
itemheight = 20;
}
}
else
{
return;
}
List <object> itemscache = new List <object>(_listSelector.ItemsSource.Cast <object>().ToList());
_view.Add(itemscache[0]);
ListBoxItem lastElement = (ListBoxItem)_listSelector.ItemContainerGenerator.ContainerFromItem(itemscache[0]);
if (lastElement != null)
{
lastElement.Visibility = Visibility.Collapsed;
}
ListBoxItem firstElement = (ListBoxItem)_listSelector.ItemContainerGenerator.ContainerFromItem(_view.FirstOrDefault());
DoubleAnimation heightAnimation = new DoubleAnimation(itemheight, 0, TimeSpan.FromSeconds(0.5));
heightAnimation.FillBehavior = FillBehavior.Stop;
heightAnimation.Completed += (s, e) =>
{
if (_animateTimer != null && _animateTimer.IsEnabled && !_isItemsUpdate)
{
if (AnimationIndex == 9999)
{
AnimationIndex = 0;
}
else
{
AnimationIndex++;
}
_view.RemoveAt(0);
}
_animationStarted = false;
};
if (_isItemsUpdate)
{
_isItemsUpdate = false;
}
firstElement.BeginAnimation(ListBoxItem.HeightProperty, heightAnimation);
lastElement.Visibility = Visibility.Visible;
}
