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POHow to view drag & drop element in WPF?
 

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  1. POHow to view drag & drop element in WPF?
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    <p>I have a <code>ListBox</code> and a <code>DockPanel</code>. List box contains items that are supposed to be dragged onto the dock panel. I've implemented that by following this <a href="http://www.wpftutorial.net/DragAndDrop.html" rel="nofollow">link</a>. </p> <p>There are a couple of things I do not understand though:</p> <ol> <li>While dragging, all I see is a cursor. I'd like to literary see the list item I am dragging to move around with my cursor. How do I do that?</li> <li>Is the <code>DragDropEffect</code> property only for the different cursor design or it has a higher purpose? :)</li> <li>How do I make list item disappear from the <code>ListBox</code> once it is dropped onto the <code>DockPanel</code>?</li> <li>I'd like to enforce some animation on the items that I drag, like glow once it is dropped. Which trigger/setter should I use for that?</li> </ol> <p>Here's my code for basic dragging and dropping: </p> <h3>Code-behind for the ListBox part</h3> <pre><code>private Point startPosition; private void ListBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { startPosition = e.GetPosition(null); } private void ListBox_PreviewMouseMove(object sender, MouseEventArgs e) { Point currentPosition; Vector offset; ListBox listBox; ListBoxItem item; Match match; DataObject dragData; currentPosition = e.GetPosition(null); offset = startPosition - currentPosition; if (e.LeftButton == MouseButtonState.Pressed &amp;&amp; (Math.Abs(offset.X) &gt; SystemParameters.MinimumHorizontalDragDistance || Math.Abs(offset.Y) &gt; SystemParameters.MinimumVerticalDragDistance)) { // Get the data binded to ListBoxItem object, which is "match" listBox = sender as ListBox; item = FindAnchestor&lt;ListBoxItem&gt;((DependencyObject)e.OriginalSource); match = (Match)listBox.ItemContainerGenerator.ItemFromContainer(item); dragData = new DataObject("match", match); DragDrop.DoDragDrop(item, dragData, DragDropEffects.Move); } } </code></pre> <h3>Code-behind for the DockPanel part</h3> <pre><code>private void DockPanel_DragEnter(object sender, DragEventArgs e) { if (!e.Data.GetDataPresent("match") || sender == e.Source) { e.Effects = DragDropEffects.None; } } private void DockPanel_Drop(object sender, DragEventArgs e) { Match match; DockPanel matchSlot; ContentPresenter contentPresenter; Binding binding; if (e.Data.GetDataPresent("match")) { match = e.Data.GetData("match") as Match; matchSlot = sender as DockPanel; contentPresenter = new ContentPresenter(); contentPresenter.ContentTemplate = this.FindResource("MatchTemplate") as DataTemplate; binding = new Binding(); binding.Source = match; contentPresenter.SetBinding(ContentPresenter.ContentProperty, binding); matchSlot.Children.Clear(); matchSlot.Children.Add(contentPresenter); } } </code></pre> <p>Thanks for all the help. </p>
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