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POFinding Child Objects in ViewBox/Canvas Object
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Id
3990919
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AcceptedAnswerId
3990998
AnswerCount
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CreationDate
2010-10-21T18:57:40.680
FavoriteCount
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LastActivityDate
2010-10-22T08:42:33.413
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LastEditorUserId
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ViewCount
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LastEditorDisplayName
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Body
I've implemented a drag and drop that is mostly working in my Silverlight 4 app. Once the users have dropped the shapes onto the canvas, I wanted to use <a href="http://www.silverlight.net/community/samples/silverlight-samples/size-rotation-decorators/" rel="nofollow">Size & Child Decorators</a>. I've tried to implement the sample code. Code below is problem section of much larger app. xmal - <pre><code><ScrollViewer Grid.RowSpan="1" Grid.Row="2" Grid.ColumnSpan="2" Grid.Column="2" Name="scrollViewer"> <Viewbox Margin="0" MinWidth="400" MinHeight="500" HorizontalAlignment="Left" VerticalAlignment="Top" Name="ViewBoxTestBuild"> <Canvas x:Name="Camera1Canvas" telerikDragDrop:RadDragAndDropManager.AllowDrop="True" Width="1200" Height="768" MouseLeftButtonDown="Camera1Canvas_MouseLeftButtonDown"> <Image x:Name="Camera1Image" Source="timemagadj.jpg" Canvas.ZIndex="-1" HorizontalAlignment="Left" VerticalAlignment="Top" /> <local:Three_Line_Graphic x:Name="threeLineEditTool" HorizontalAlignment="Left" Canvas.Left="594" Canvas.Top="621" /> <l:Adorner x:Name="adorn" Canvas.ZIndex="100" /> </Canvas> </Viewbox> </ScrollViewer> </code></pre> c# code - <pre><code>private void Camera1Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { var sendingObj = sender as Canvas; if (sendingObj == null) return; foreach (UserControl l in VisualTreeHelper.FindElementsInHostCoordinates(e.GetPosition(null), sendingObj)) { if (l.Parent == Camera1Canvas ) { adorn.AdornedElement = l as FrameworkElement; adorn.adorned_MouseLeftButtonDown(l, e); break; } } base.OnMouseLeftButtonDown(e); } </code></pre> My problem is that when VisualTreeHelper.FindElementsInHostCoordinates is called on left mouse click event, it returns no elements when I click on any object. I sure that it is a coordinate mapping issue, but as this is new ground for me, I'm unsure how to fix it.
Tags
<c#><silverlight><silverlight-4.0>
Title
Finding Child Objects in ViewBox/Canvas Object
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