Empty treeviewitem and common moving support

[punker76]

yes... now it's time to support empty TreeViewItem's ...

• it's now possible to drop data on empty treeview items
• re-create the EffectAdorner if drag&drop Effects are changed
• the drop target adorner is now expanded to the right
• it's now also possible to move any data to another ItemsControl
• change default behavior (move or copy, now default is copy)

grab the latest alpha: https://www.nuget.org/packages/gong-wpf-dragdrop/

Closes #31

[punker76]

@christianhuening @dudiam @chandramouleswaran @AnnekeHeelsum @AnnekeHeelsum @Toprakete testable with gong-wpf-dragdrop 1.0.0-ALPHA002

[punker76]

next change would be (yes a breaking change)

• change default behavior to Move for drag&drop to another control
• use SHIFT drag&drop for copy drag&drop

/cc @thoemmi what do you think?

/cc @christianhuening @dudiam @chandramouleswaran @AnnekeHeelsum @AnnekeHeelsum @Toprakete

[christianhuening]

@punker76 Thanks for updating this solution! The project I used it for has long gone into production and is no longer maintained by me. But I nonetheless appreciate the new stuff and the fixes for future projects! Great!
The behavior regarding moving and copying sounds reasonable! Should be configurable though.

Cheers,
Christian

[phil-scott-78]

ran into a bug testing this out. easy to reproduce using the Issue 65 view. Dragging an item with children to a top level position will cause it to lose the children of that item.

[punker76]

@enkafan ups, i should fix this 8-D

[punker76]

@enkafan it's now fixed in 1.0.0-ALPHA003

but you should noticed, issue #65 example is a very special example...

<TreeView Grid.Column="0"
          Grid.Row="1"
          dd:DragDrop.IsDropTarget="True"
          dd:DragDrop.IsDragSource="True"
          dd:DragDrop.UseDefaultDragAdorner="True">
  <TreeViewItem Header="A TreeViewItem with ItemsSource"
                ItemsSource="{Binding TreeCollection}">
    <TreeViewItem.ItemTemplate>
      <HierarchicalDataTemplate ItemsSource="{Binding Children}">
        <TextBlock Text="{Binding Caption}" />
      </HierarchicalDataTemplate>
    </TreeViewItem.ItemTemplate>
  </TreeViewItem>
  <TreeView.ItemTemplate>
    <HierarchicalDataTemplate ItemsSource="{Binding Children}">
      <TextBlock Text="{Binding Caption}" />
    </HierarchicalDataTemplate>
  </TreeView.ItemTemplate>
</TreeView>

[Toprakete]

Hi,
thx for updating. Works very fine for my need.
Still one thing: Start Sample, Select Bound TreeView and click below the tree-items.
It crashes in ItemsControlExtensions.cs because the SelectedItemProperty is read only.

Thx and best regards
Toprakete