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POHow do I bind opacity of specific GridView-Items with a double property of its items-objects Win8.1 App, C#
 

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  1. POHow do I bind opacity of specific GridView-Items with a double property of its items-objects Win8.1 App, C#
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    <p>I have a scedule with subjects in it. When I turn on a specific mode I want to change the opacity of certain subjects. Therefore I have declared the property:</p> <pre><code> private double _sceduleOpacity; public virtual double SceduleOpacity { get { if (_sceduleOpacity == 0) return 0.9; else return _sceduleOpacity; } set { _sceduleOpacity = value; } } </code></pre> <p>inside the Subject-Object. When the mode is set, the SceduleOpacity-Property of the specific Subject is changed to the desired value (I've checked that).</p> <p>Now all I need is a binding to that Property so that it is visible on the UI. But that is where the problem is. I've tried several approaches:</p> <ol> <li>Bind it to the opacity of the DataTemplate:</li> </ol> <p>GridView:</p> <pre><code>ItemTemplate="{Binding Mode=TwoWay, Source={StaticResource SceduleGridViewTemplate}}" </code></pre> <p>Resourcedictionary:</p> <pre><code>&lt;DataTemplate x:Key="SceduleGridViewTemplate"&gt; &lt;Grid Background="{Binding ColorHash, Converter={StaticResource HexToSolidColorBrushConverter}}" [...] Opacity="{Binding SceduleOpacity}"&gt; &lt;TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" TextAlignment="Center" FontSize="28" Text="{Binding Name}"/&gt; &lt;/Grid&gt; </code></pre> <p>This does not have any effect at all. But since the following binding:</p> <pre><code> &lt;Grid [...]&gt; &lt;TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" TextAlignment="Center" FontSize="28" Text="{Binding Name}" Opacity="{Binding SceduleOpacity}"/&gt; &lt;/Grid&gt; </code></pre> <p>sets the opacity of the displayed text successfully, I went on looking what the problem might be. </p> <ol> <li>Bind it to the opacity of the Style or ItemContainerStyle:</li> </ol> <p>I found out that the opacity of each GridView-Item is set by either in the Styles- or in the ItemContainerStyle-Templates. But still the bindings do not work at all:</p> <p>GridView: Style="{Binding Source={StaticResource SceduleGridViewStyle}, Mode=TwoWay}"></p> <p>Resourcedictionary:</p> <pre><code>&lt;Style x:Key="SceduleItemStyle" TargetType="GridViewItem"&gt; [...] &lt;Setter Property="Opacity" Value="{Binding SceduleOpacity}"/&gt; [...]&lt;/Style&gt; </code></pre> <p>GridView: ItemContainerStyle="{Binding Source={StaticResource SceduleItemStyle}, Mode=TwoWay}"></p> <p>Resourcedictionary:</p> <pre><code>&lt;Style x:Key="SceduleGridViewStyle" TargetType="GridView"&gt; [...] &lt;Setter Property="Opacity" Value="{Binding SceduleOpacity}"/&gt; [...]&lt;/Style&gt; </code></pre> <p>Do you have any idea on how I could fix that? Thank you very much!</p>
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    1. USFunkyPeanut
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    1. COHow are you setting the DataContext of the control that has the the ScheduleOpacity property?
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    2. COHey, I thought it would be automatically set to the ItemsSource wouldn't it? Thanks
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      1. USFunkyPeanut
 

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