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POSet Height of First ListBoxItem as difference of the other Items in WP7
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  1. POSet Height of First ListBoxItem as difference of the other Items in WP7
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    copied!<p>i need to show a list of item in a ListBox from the bottom in WP7. So in case i have some items that the height sum of them is &lt; of ListBox Height i need to have a blank item at the top with the difference of the Height.</p> <p>I have to do this because i set the ItemSource of Listbox, so i cannot know what is the right height of all items before load them.</p> <p>In Item_loaded event of every Item i save the height and at the last i need to set the Height of the First.</p> <pre><code>&lt;ListBox x:Name="ConvListBox" Margin="0,0,-12,0" &gt; &lt;ListBox.ItemTemplate &gt; &lt;DataTemplate &gt; &lt;Grid&gt; &lt;StackPanel Name="BaloonMessage" Margin="3,0,0,0" Loaded="Baloon_Loaded" Tag="{Binding IsSentMsg}" &gt; &lt;TextBlock Name="SMSText" Text="{Binding SMSText}" Margin="7,3,8,35" TextWrapping="Wrap" Height="Auto" Width="Auto" FontSize="22" Foreground="White"/&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>I set the ItemsSource and add a blank item at top, and a blank at bottom:</p> <pre><code> ObservableCollection&lt;ClassMessaggio&gt; messaggi = new ConversazioneViewModel(MessaggioConversazione).Conversazione; ClassMessaggio FirstLineScrollMessage = new ClassMessaggio(); FirstLineScrollMessage.IsSentMsg = "3"; messaggi.Insert(0, FirstLineScrollMessage); ClassMessaggio LastLineScrollMessage = new ClassMessaggio(); LastLineScrollMessage.IsSentMsg = "2"; messaggi.Insert(messaggi.Count, LastLineScrollMessage); this.ConvListBox.ItemsSource = messaggi; </code></pre> <p>And at Item_Loaded i'm trying this:</p> <pre><code>var Panel = (StackPanel) sender; if (Panel != null) { Grid grid = (Grid)Panel.Parent; Border baloon = (Border)Panel.FindName("Baloon"); baloon.Width = grid.Width - 100; if (Panel.Tag.ToString() == "3") { TotalBaloonsHeight = 0; baloon.Background = grid.Background; baloon.Name = "FirstScrollBaloon"; } else if (Panel.Tag.ToString() == "2") { baloon.Height = 2; Panel.Height = 2; grid.Height = 2; Border FirstBaloon = (Border)ConvListBox.FindName("FirstScrollBaloon"); if (FirstBaloon != null) { FirstBaloon.Height = ConvListBox.Height - TotalBaloonsHeight; } } else { TotalBaloonsHeight = TotalBaloonsHeight + baloon.Height; } } </code></pre> <p>My problem is that this line return me always null :( </p> <pre><code> Border FirstBaloon = (Border)ConvListBox.FindName("FirstScrollBaloon"); </code></pre> <p>I hope is clear, sorry for my english. </p> <p>EDIT::</p> <p>Ok this should work:</p> <pre><code>var Baloons = LayoutRoot.GetVisualDescendants().OfType&lt;Border&gt;(); foreach (var FirstBaloon in Baloons) { if (FirstBaloon != null) { if (FirstBaloon.Name == "FirstScrollBaloon") { FirstBaloon.Height = ConvListBox.ActualHeight - TotalBaloonsHeight; break; } } } </code></pre>
 

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