private ReorderListBox.RearrangeItemInfo[] BuildRearrangeMap(int viewFirstIndex, int viewLastIndex)
{
ReorderListBox.RearrangeItemInfo[] rearrangeItemInfoArray = new ReorderListBox.RearrangeItemInfo[this.Items.Count];
for (int index = 0; index < rearrangeItemInfoArray.Length; ++index)
{
object obj = this.Items[index];
ReorderListBox.RearrangeItemInfo rearrangeItemInfo = new ReorderListBox.RearrangeItemInfo()
{
Item = obj,
FromIndex = index
};
if (viewFirstIndex <= index && index <= viewLastIndex)
{
ReorderListBoxItem reorderListBoxItem = (ReorderListBoxItem)this.ItemContainerGenerator.ContainerFromIndex(index);
if (reorderListBoxItem != null)
{
Point point = reorderListBoxItem.TransformToVisual((UIElement)this.rearrangeCanvas).Transform(new Point(0.0, 0.0));
rearrangeItemInfo.FromY = point.Y;
rearrangeItemInfo.Height = reorderListBoxItem.RenderSize.Height;
}
}
rearrangeItemInfoArray[index] = rearrangeItemInfo;
}
return(rearrangeItemInfoArray);
}
private void dragInterceptor_ManipulationStarted(object sender, ManipulationStartedEventArgs e)
{
this.scrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
if (this.dragItem != null)
{
return;
}
e.Handled = true;
if (this.itemsPanel == null)
{
this.itemsPanel = (Panel)VisualTreeHelper.GetChild((DependencyObject)this.scrollViewer.Content, 0);
}
this._isManipulating = true;
GeneralTransform visual = this.dragInterceptor.TransformToVisual(Application.Current.RootVisual);
List <UIElement> list = VisualTreeHelper.FindElementsInHostCoordinates(ReorderListBox.GetHostCoordinates(visual.Transform(e.ManipulationOrigin)), (UIElement)this.itemsPanel).ToList <UIElement>();
ReorderListBoxItem reorderListBoxItem = list.OfType <ReorderListBoxItem>().FirstOrDefault <ReorderListBoxItem>();
if (reorderListBoxItem == null || !list.Contains((UIElement)reorderListBoxItem.DragHandle))
{
return;
}
VisualStateManager.GoToState((Control)reorderListBoxItem, "Dragging", true);
Point point = reorderListBoxItem.TransformToVisual((UIElement)this.dragInterceptor).Transform(new Point(0.0, 0.0));
Canvas.SetLeft((UIElement)this.dragIndicator, point.X);
Canvas.SetTop((UIElement)this.dragIndicator, point.Y);
this.dragIndicator.Width = reorderListBoxItem.RenderSize.Width;
this.dragIndicator.Height = reorderListBoxItem.RenderSize.Height;
this.dragItemContainer = reorderListBoxItem;
this.dragItem = this.dragItemContainer.Content;
this.isDragItemSelected = this.dragItemContainer.IsSelected;
this.dragInterceptorRect = visual.TransformBounds(new Rect(new Point(0.0, 0.0), this.dragInterceptor.RenderSize));
this.dropTargetIndex = -1;
}
public void GetViewIndexRange(bool includePartial, out int firstIndex, out int lastIndex)
{
if (this.Items.Count > 0)
{
firstIndex = 0;
lastIndex = this.Items.Count - 1;
if (this.scrollViewer == null || this.Items.Count <= 1)
{
return;
}
Thickness thickness = new Thickness(this.scrollViewer.BorderThickness.Left + this.scrollViewer.Padding.Left, this.scrollViewer.BorderThickness.Top + this.scrollViewer.Padding.Top, this.scrollViewer.BorderThickness.Right + this.scrollViewer.Padding.Right, this.scrollViewer.BorderThickness.Bottom + this.scrollViewer.Padding.Bottom);
Rect rect1 = this.scrollViewer.TransformToVisual(Application.Current.RootVisual).TransformBounds(new Rect(new Point(0.0, 0.0), this.scrollViewer.RenderSize));
ReorderListBoxItem reorderListBoxItem1 = VisualTreeHelper.FindElementsInHostCoordinates(ReorderListBox.GetHostCoordinates(new Point(rect1.Left + thickness.Left, rect1.Top + thickness.Top)), (UIElement)this.scrollViewer).OfType <ReorderListBoxItem>().FirstOrDefault <ReorderListBoxItem>();
if (reorderListBoxItem1 != null)
{
Rect rect2 = reorderListBoxItem1.TransformToVisual(Application.Current.RootVisual).TransformBounds(new Rect(new Point(0.0, 0.0), reorderListBoxItem1.RenderSize));
firstIndex = this.ItemContainerGenerator.IndexFromContainer((DependencyObject)reorderListBoxItem1);
if (!includePartial && firstIndex < this.Items.Count - 1 && (rect2.Top < rect1.Top && rect2.Bottom < rect1.Bottom))
{
firstIndex = firstIndex + 1;
}
}
ReorderListBoxItem reorderListBoxItem2 = VisualTreeHelper.FindElementsInHostCoordinates(ReorderListBox.GetHostCoordinates(new Point(rect1.Left + thickness.Left, rect1.Bottom - thickness.Bottom - 1.0)), (UIElement)this.scrollViewer).OfType <ReorderListBoxItem>().FirstOrDefault <ReorderListBoxItem>();
if (reorderListBoxItem2 == null)
{
return;
}
Rect rect3 = reorderListBoxItem2.TransformToVisual(Application.Current.RootVisual).TransformBounds(new Rect(new Point(0.0, 0.0), reorderListBoxItem2.RenderSize));
lastIndex = this.ItemContainerGenerator.IndexFromContainer((DependencyObject)reorderListBoxItem2);
if (includePartial || lastIndex <= firstIndex || (rect3.Bottom <= rect1.Bottom || rect3.Top <= rect1.Top))
{
return;
}
lastIndex = lastIndex - 1;
}
else
{
firstIndex = -1;
lastIndex = -1;
}
}
private ReorderListBox.RearrangeItemInfo[] BuildRearrangeMap2(ReorderListBox.RearrangeItemInfo[] map, int viewFirstIndex, int viewLastIndex)
{
ReorderListBox.RearrangeItemInfo[] rearrangeItemInfoArray = new ReorderListBox.RearrangeItemInfo[this.Items.Count];
for (int index = 0; index < rearrangeItemInfoArray.Length; ++index)
{
object item = this.Items[index];
ReorderListBox.RearrangeItemInfo rearrangeItemInfo = ((IEnumerable <ReorderListBox.RearrangeItemInfo>)map).FirstOrDefault <ReorderListBox.RearrangeItemInfo>((Func <ReorderListBox.RearrangeItemInfo, bool>)(rii =>
{
if (rii.ToIndex < 0)
{
return(rii.Item == item);
}
return(false);
}));
if (rearrangeItemInfo == null)
{
rearrangeItemInfo = new ReorderListBox.RearrangeItemInfo()
{
Item = item
}
}
;
rearrangeItemInfo.ToIndex = index;
if (viewFirstIndex <= index && index <= viewLastIndex)
{
ReorderListBoxItem reorderListBoxItem = (ReorderListBoxItem)this.ItemContainerGenerator.ContainerFromIndex(index);
if (reorderListBoxItem != null)
{
Point point = reorderListBoxItem.TransformToVisual((UIElement)this.rearrangeCanvas).Transform(new Point(0.0, 0.0));
rearrangeItemInfo.ToY = point.Y;
rearrangeItemInfo.Height = reorderListBoxItem.RenderSize.Height;
}
}
rearrangeItemInfoArray[index] = rearrangeItemInfo;
}
return(rearrangeItemInfoArray);
}
private int FindViewLastIndex(int firstIndex)
{
int num = firstIndex;
Rect rect1 = this.scrollViewer.TransformToVisual(Application.Current.RootVisual).TransformBounds(new Rect(new Point(0.0, 0.0), this.scrollViewer.RenderSize));
for (; num < this.Items.Count - 1; ++num)
{
ReorderListBoxItem reorderListBoxItem = (ReorderListBoxItem)this.ItemContainerGenerator.ContainerFromIndex(num + 1);
if (reorderListBoxItem != null)
{
Rect rect2 = reorderListBoxItem.TransformToVisual(Application.Current.RootVisual).TransformBounds(new Rect(new Point(0.0, 0.0), reorderListBoxItem.RenderSize));
rect2.Intersect(rect1);
if (rect2 == Rect.Empty)
{
break;
}
}
else
{
break;
}
}
return(num);
}
private void AnimateDrop(ReorderListBoxItem itemContainer)
{
Rect rect = itemContainer.TransformToVisual((UIElement)this.dragInterceptor).TransformBounds(new Rect(new Point(0.0, 0.0), itemContainer.RenderSize));
double num = Math.Abs(rect.Y - Canvas.GetTop((UIElement)this.dragIndicator) - ((TranslateTransform)this.dragIndicator.RenderTransform).Y);
if (num > 0.0)
{
TimeSpan timeSpan = TimeSpan.FromSeconds(0.25 * num / rect.Height);
Storyboard storyboard = new Storyboard();
DoubleAnimation doubleAnimation = new DoubleAnimation();
Storyboard.SetTarget((Timeline)doubleAnimation, (DependencyObject)this.dragIndicator.RenderTransform);
Storyboard.SetTargetProperty((Timeline)doubleAnimation, new PropertyPath((object)TranslateTransform.YProperty));
doubleAnimation.To = new double?(rect.Y - Canvas.GetTop((UIElement)this.dragIndicator));
doubleAnimation.Duration = (Duration)timeSpan;
storyboard.Children.Add((Timeline)doubleAnimation);
EventHandler eventHandler = (EventHandler)((param0, param1) =>
{
this.dragItem = null;
itemContainer.Opacity = 1.0;
this.dragIndicator.Visibility = Visibility.Collapsed;
this.dragIndicator.Source = null;
((TranslateTransform)this.dragIndicator.RenderTransform).Y = 0.0;
VisualStateManager.GoToState((Control)itemContainer, "NotDragging", true);
});
storyboard.Completed += eventHandler;
storyboard.Begin();
}
else
{
this.dragItem = null;
itemContainer.Opacity = 1.0;
this.dragIndicator.Visibility = Visibility.Collapsed;
this.dragIndicator.Source = null;
VisualStateManager.GoToState((Control)itemContainer, "NotDragging", true);
}
}