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POPart of list not rendered
 

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    <p>I'm having a problem with layout rendering. I have some experience in <code>C#</code> but i never encountered something like this before.</p> <p>I'm building an video messaging application, when a conversation starts an new window is opened and the list and background are set on <code>Collapsed</code>. At the end of an conversation the new window closes and the list and background are set back to Visible.</p> <p>when that happens i get this: <img src="https://i.stack.imgur.com/ww2BY.png" alt="enter image description here"> My list is build with StackPanel and UserControl, when i scroll the list the rendering is fine again.</p> <p>I did some research on Google about objects that aren't rendered on the UI and found that you can use <code>InvalidateVisual</code> to force the UI to be rendered again, but this doesn't seem to be working in my application. I call this method at the end of every conversation, after making the list and background Visible.</p> <p>What are some ways to make sure the UI gets rendered correctly? Thanks.</p> <p><strong>Update 1:</strong></p> <p>I've added this piece of code to my UserControl.</p> <pre><code>protected override void OnRender(DrawingContext drawingContext) { InvalidateVisual(); base.OnRender(drawingContext); } </code></pre> <p>But is this the way to go? I've already seen that method is called over and over in loop when i do it this way, but i doesn't seem to affect the performance on the devices i test on.</p> <p><strong>Update 2:</strong></p> <p>After some more intensive test i found that the code i added in Update 1 does have a great impact on the performance of the application, so this is not going to work for me.</p> <p><strong>Update 3:</strong></p> <p>Now I've created an delay before <code>InvalidateVisual</code> is called, using a <code>Timer</code>. Is set the Timer to 500 milliseconds before calling <code>InvalidateVisual</code>, this forces the layout to render again. By the time my second window is closed the layout will be updated an second time. Here is my code</p> <pre><code>Timer t = new Timer(500); t.AutoReset = false; t.Elapsed += (s, ee) =&gt; { ((Timer)s).Stop(); ((Timer)s).Dispose(); InvalidateVisual(); }; t.Start(); </code></pre> <p>After a quick test it seems to work, but i need to test it more intensely to make sure. Any other suggestions are still welcome.</p> <p><strong>Update 4:</strong></p> <p>After testing my solution in update 3, i found out this is not going to work. @Sheridan: My application doesn't need re sizing, it is an full screen application. This is the code i wrote to create the list:</p> <p>This the XAML code</p> <pre><code>&lt;TabItem x:Name="TabHistory" Header="Geschiedenis"&gt; &lt;sys:FixedScrollViewer VerticalAlignment="Stretch" HorizontalAlignment="Stretch" PanningMode="VerticalOnly" Margin="0,0,0,7" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" HorizontalContentAlignment="Left"&gt; &lt;StackPanel x:Name="CallLogList" /&gt; &lt;/sys:FixedScrollViewer&gt; &lt;/TabItem&gt; </code></pre> <p>And this is the code that fills it.</p> <pre><code>private void OnRosterUpdate(object sender, RosterUpdateEventArgs e) { if (MessageWindow.IsOpen) MessageWindow.Close(); Dispatcher.Invoke((Action)delegate() { if (e.Action == RosterAction.ADD) { RosterContact button = new RosterContact(e.Item); button.Call += StartCall_Callback; button.ShowInfo += Info_Callback; button.HideInfo += button_HideInfo; roster.Children.Add(button); } else if (e.Action == RosterAction.REMOVE) { foreach (RosterContact item in roster.Children) { if (item.UserData.Peer == e.Item.Peer) { roster.Children.Remove(item); break; } } } }); } </code></pre> <p>RosterContact is of type UserControl.</p>
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    1. USPatrick Wisgerhof
    1. USPatrick Wisgerhof
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    1. COtry using this.Invalidate() after you scroll
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      1. USJade
    2. COWhen i scroll even a little, rendering goes OK again. So i think its really in making it Collapse and then making it Visible.
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      1. USPatrick Wisgerhof
 

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