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POForcing a ItemsControl panel to repaint
 

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  1. POForcing a ItemsControl panel to repaint
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    <p>Alright, I have a ListBox that holds container controls. Each container control contains 1-X widgets and these widgets are laid out in a completely custom WrapPanel and it's working great. The size of the widgets is determined/updated from 2 factors:</p> <ol> <li>The size of the parent listbox (updated if changed)</li> <li>A view scale SliderBar (25%, 50%, 100%) - like a zoom button</li> </ol> <p>If the listbox size is changed, the custom panel repaints and sizes of widgets are adjusted accordingly in my code. Working perfect.</p> <pre><code> &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="*" /&gt; &lt;RowDefinition Height="5" /&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;ListBox Name="lstGroups" Grid.Column="0" ItemsSource="{Binding Path=TopLevelGroups}" BorderThickness="0" ScrollViewer.VerticalScrollBarVisibility="Hidden" SizeChanged="ListBox_SizeChanged" VerticalAlignment="Stretch" SelectionMode="Extended" Style="{ StaticResource ListBoxWithAutoScroll_Horizontal }" &gt; &lt;ListBox.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;StackPanel Orientation="Horizontal"/&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ListBox.ItemsPanel&gt; &lt;/ListBox&gt; &lt;StackPanel Grid.Row="2" HorizontalAlignment="Left" VerticalAlignment="Center" Orientation="Horizontal"&gt; &lt;Label Margin="5"&gt;View Scale:&lt;/Label&gt; &lt;Slider Name="sldView" Minimum="25" Maximum="100" IsSnapToTickEnabled="True" TickPlacement="BottomRight" Ticks="25,50,100" Width="125" ValueChanged="Slider_ValueChanged"/&gt; &lt;/StackPanel&gt; &lt;StackPanel Grid.Row="2" Orientation="Horizontal" VerticalAlignment="Top" HorizontalAlignment="Right" DockPanel.Dock="Right"&gt; &lt;Button Command="{Binding Path=StopCommand}" Content="Stop" Height="30" Width="60" Margin="1" IsEnabled="{Binding Path=CanStop}" x:Name="btnStop" /&gt; &lt;Button Command="{Binding Path=RunCommand}" Content="Run" Height="30" Width="60" IsEnabled="{Binding Path=CanRun}" x:Name="btnRun" HorizontalAlignment="Right" Margin="1"/&gt; &lt;/StackPanel&gt; </code></pre> <p>--Widget--</p> <pre><code> &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition Height="*" /&gt; &lt;RowDefinition Height="*" /&gt; &lt;/Grid.RowDefinitions&gt; &lt;StackPanel Orientation="Horizontal" Grid.Row="0"&gt; &lt;StackPanel.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Header="Edit" Command="{Binding Path=EditCommand}" IsEnabled="{Binding IsMonitorStopped}"/&gt; &lt;MenuItem Header="Remove" Command="{Binding Path=RemoveCommand}" IsEnabled="{Binding IsMonitorStopped}"/&gt; &lt;/ContextMenu&gt; &lt;/StackPanel.ContextMenu&gt; &lt;Image Source="" Margin="2" /&gt; &lt;Label Content="{Binding Path=Name}" Margin="5,0,0,0" VerticalAlignment="Center"/&gt; &lt;/StackPanel&gt; &lt;ItemsControl Grid.Row="1" ItemsSource="{Binding Path=Entities}" Name="icEntities" &gt; &lt;ItemsControl.Resources&gt; &lt;DataTemplate DataType="{x:Type vm:AppleViewModel}"&gt; &lt;ct:AppleTile Height="{Binding Path=AppleHeight}" Width="{Binding Path=AppleWidth}" Grid.ColumnSpan="2" Grid.RowSpan="2"/&gt; &lt;/DataTemplate&gt; &lt;DataTemplate DataType="{x:Type vm:OrangeViewModel}"&gt; &lt;ct:OrangeTile Height="{Binding Path=OrangeHeight}" Width="{Binding Path=OrangeWidth}" Grid.ColumnSpan="2"/&gt; &lt;/DataTemplate&gt; &lt;DataTemplate DataType="{x:Type vm:GrapeViewModel}"&gt; &lt;ct:GrapeTile Height="{Binding Path=GrapeHeight}" Width="{Binding Path=GrapeWidth}" /&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.Resources&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;!-- Custom Wrap panel --&gt; &lt;co:MonitorPanel x:Name="mpMain"/&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;/ItemsControl&gt; &lt;/Grid&gt; </code></pre> <p>If the user moves the Slider bar for zoom in/zoom out - I need to be able to force the custom panels to re-render with the newly calculated widget sizes.</p> <pre><code>private void ListBox_SizeChanged(object sender, SizeChangedEventArgs e) { //Works perfect this.ResetViewScale(e.NewSize); } </code></pre> <p>...here comes trouble:</p> <pre><code> private void Slider_ValueChanged(object sender, RoutedPropertyChangedEventArgs&lt;double&gt; e) { ...code here this.ResetViewScale(new Size(this.myListBox.ActualWidth, this.myListBox.ActualHeight)); //How can I repaint my list/panel? } private void ResetViewScale(Size e) { Size newSize = new Size(e.Height / 2, e.Height / 2); switch (App.ApplicationViewScale) { case ViewScale.Full: Size full = new Size(newSize.Height, newSize.Height); App.TileSize = new Size(full.Height, full.Width); break; case ViewScale.Half: Size half = new Size(newSize.Height / 2, newSize.Height / 2); App.TileSize = new Size(half.Height, half.Width); break; case ViewScale.Quarter: Size quarter = new Size(newSize.Height / 4, newSize.Height / 4); App.TileSize = new Size(quarter.Height, quarter.Width); break; default: Size defaultToFull = new Size(newSize.Height, newSize.Height); App.TileSize = new Size(defaultToFull.Height, defaultToFull.Width); break; } } </code></pre> <p>I tried using all the Invalidate methods but nothing seems to be working. Sorta stuck...</p>
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    1. USMickeySixx
    1. USMickeySixx
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      1. POForcing a ItemsControl panel to repaint
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    1. COTry an InvalidateMeasure, before an InvalidateVisual
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      1. USColin Smith
    2. COThis did not work
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      1. USMickeySixx
    3. COCan you show what you are doing in the ResetViewScale, thanks
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      1. USColin Smith
 

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