public DragInfo(object sender, MouseButtonEventArgs e)
{
//use the relative mouse position for browser
DragStartPosition = Mouse.GetPosition(sender as IInputElement);
Effects = DragDropEffects.None;
MouseButton = e.ChangedButton;
VisualSource = sender as UIElement;
ItemsControl itemsControl = sender as ItemsControl;
if (itemsControl != null)
{
UIElement item = null;
// Don't remove try/catch, sometimes exception is thrown here.
// For example, when clicking "Loading more..." item, the item will be removed immediately,
// so when code goes here, the item has gone and exception is thrown.
try
{
item = itemsControl.GetItemContainer((UIElement)e.OriginalSource);
}
catch
{
}
if (item != null)
{
ItemsControl itemParent = ItemsControl.ItemsControlFromItemContainer(item);
if (itemParent != null)
{
SourceCollection = itemParent.ItemsSource ?? itemParent.Items;
SourceItem = itemParent.ItemContainerGenerator.ItemFromContainer(item);
}
SourceItems = itemsControl.GetSelectedItems();
// Some controls (TreeView) haven't updated their
// SelectedItem by this point. Check to see if there 1 or less item in
// the SourceItems collection, and if so, override the SelectedItems
// with the clicked item.
if (SourceItems.Cast <object>().Count() <= 1)
{
SourceItems = Enumerable.Repeat(SourceItem, 1);
}
VisualSourceItem = item;
}
else
{
SourceCollection = itemsControl.ItemsSource ?? itemsControl.Items;
}
}
if (SourceItems == null)
{
SourceItems = Enumerable.Empty <object>();
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public DragInfo(object sender, MouseButtonEventArgs e)
{
DragStartPosition = e.GetPosition(null);
Effects = DragDropEffects.None;
MouseButton = e.ChangedButton;
VisualSource = sender as UIElement;
if (sender is ItemsControl)
{
ItemsControl itemsControl = (ItemsControl)sender;
UIElement item = itemsControl.GetItemContainer((UIElement)e.OriginalSource);
if (item != null)
{
ItemsControl itemParent = ItemsControl.ItemsControlFromItemContainer(item);
SourceCollection = itemParent.ItemsSource ?? itemParent.Items;
SourceItem = itemParent.ItemContainerGenerator.ItemFromContainer(item);
SourceItems = itemsControl.GetSelectedItems();
// Some controls (I'm looking at you TreeView!) haven't updated their
// SelectedItem by this point. Check to see if there 1 or less item in
// the SourceItems collection, and if so, override the SelectedItems
// with the clicked item.
if (SourceItems.Cast <object>().Count() <= 1)
{
SourceItems = Enumerable.Repeat(SourceItem, 1);
}
VisualSourceItem = item;
}
else
{
SourceCollection = itemsControl.ItemsSource ?? itemsControl.Items;
}
}
if (SourceItems == null)
{
SourceItems = Enumerable.Empty <object>();
}
this.IsNotHandled = false;
}
private void PopulateInfoFromItemControl(RoutedEventArgs e, ItemsControl control)
{
var itemsControl = control;
var item = itemsControl.GetItemContainer((UIElement)e.OriginalSource);
if (item == null)
{
SourceCollection = itemsControl.ItemsSource ?? itemsControl.Items;
return;
}
var itemParent = ItemsControl.ItemsControlFromItemContainer(item);
SourceCollection = itemParent.ItemsSource ?? itemParent.Items;
SourceItem = itemParent.ItemContainerGenerator.ItemFromContainer(item);
SourceItems = itemsControl.GetSelectedItems();
if (SourceItems.Cast <object>().Count() <= 1)
{
SourceItems = Enumerable.Repeat(SourceItem, 1);
}
VisualSourceItem = item;
}
/// <summary>
/// Initializes a new instance of the DragInfo class.
/// </summary>
/// <param name="sender">
/// The sender of the mouse event that initiated the drag.
/// </param>
/// <param name="e">
/// The mouse event that initiated the drag.
/// </param>
public DragInfo(object sender, MouseButtonEventArgs e)
{
DragStartPosition = e.GetPosition((IInputElement)sender);
Effects = DragDropEffects.None;
MouseButton = e.ChangedButton;
VisualSource = sender as UIElement;
var itemsControl = sender as ItemsControl;
if (itemsControl != null)
{
var lSourceItem = e.OriginalSource as UIElement;
// If we can't cast object as a UIElement it might be a FrameworkContentElement, if so try and use its parent.
if (lSourceItem == null && e.OriginalSource is FrameworkContentElement)
{
lSourceItem = ((FrameworkContentElement)e.OriginalSource).Parent as UIElement;
}
UIElement lItem = null;
if (lSourceItem != null)
{
lItem = itemsControl.GetItemContainer(lSourceItem);
}
if (lItem == null)
{
lItem = itemsControl.GetItemContainerAt(
e.GetPosition(itemsControl),
itemsControl.GetItemsPanelOrientation());
}
if (lItem != null)
{
// Remember the relative position of the item being dragged
PositionInDraggedItem = e.GetPosition(lItem);
var lItemParent = ItemsControl.ItemsControlFromItemContainer(lItem);
if (lItemParent != null)
{
SourceCollection = lItemParent.ItemsSource ?? lItemParent.Items;
SourceItem = lItemParent.ItemContainerGenerator.ItemFromContainer(lItem);
}
SourceItems = itemsControl.GetSelectedItems();
// Some controls (I'm looking at you TreeView!) haven't updated their
// SelectedItem by this point. Check to see if there 1 or less item in
// the SourceItems collection, and if so, override the control's
// SelectedItems with the clicked item.
if (SourceItems.Cast <object>().Count() <= 1)
{
SourceItems = Enumerable.Repeat(SourceItem, 1);
}
VisualSourceItem = lItem;
}
else
{
SourceCollection = itemsControl.ItemsSource ?? itemsControl.Items;
}
}
else
{
var element = sender as UIElement;
if (element != null)
{
PositionInDraggedItem = e.GetPosition(element);
}
}
if (SourceItems == null)
{
SourceItems = Enumerable.Empty <object>();
}
}