WPF problems with Behavior.GazeAware binding

[Martin Krizek]

Hi,
in WPF I have two elements and I want that both could be “active” (firing HasGazeChanged) only in certain conditions. So in one element I set eyeX:Behavior.GazeAware through binding (I also tried to set UpdateSourceTrigger=PropertyChanged) and in the other one I set eyeX:Behavior.GazeAware through DiscreteBooleanKeyFrame in Animation.
But it seems that both ways fails because both elements don’t react at all. When I set theirs eyeX:Behavior.GazeAware to True directly in XAML, both elements works. Can you please help me solve this issue?

[Patrik [Tobii]]

Hello Martin,

Would it be possible for you to provide a minimal sample showing the problem you’re experiencing?

Best regards
Patrik Svensson

[Martin Krizek]

Hello Patrik,
Thanks for quick response.
If I use your example “GazeAwareElements”. Add to “EyeXGazeAwareButton” style these setters:

<Setter Property="Opacity" Value="0.5" />
 <Setter Property="eyeX:Behavior.GazeAware" Value="False" />

And this Animation to Style.Triggers:

<EventTrigger RoutedEvent="FrameworkElement.Loaded">
    <BeginStoryboard>
       <Storyboard AutoReverse="True" RepeatBehavior="Forever">
           <BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="(eyeX:Behavior.GazeAware)">
               <DiscreteBooleanKeyFrame KeyTime="0:0:1.5" Value="True" />
           </BooleanAnimationUsingKeyFrames>
           <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
               <SplineDoubleKeyFrame KeyTime="0:0:1.5" Value="0.5" />
               <SplineDoubleKeyFrame KeyTime="0:0:5.5" Value="1" KeySpline="0.75,0,0.5,1" />
           </DoubleAnimationUsingKeyFrames>
       </Storyboard>
    </BeginStoryboard>
 </EventTrigger>

For binding:
If you add for example CheckBox into Grid:
<CheckBox Name="MyCheckBox" Content="Allow gaze" IsChecked="True" />
And change StackPanel:

<StackPanel Grid.Row="1"
                    Grid.Column="1"
                    Style="{StaticResource EyeXGazeAwarePanel}"
                    eyeX:Behavior.GazeAware="{Binding ElementName=MyCheckBox, Path=IsChecked, UpdateSourceTrigger=PropertyChanged}">

[Author]

Posts