fire event only from user request

Question

Is the any way to make Checked and Unchecked only fire when button clicked by user?

IsChecked is bound to Playing property. This value may change from background (not by user). So it causes Checked and Unchecked events to fire again and conflict with other things.

When ever I try to write code to fix this it becomes real mess. Thanks for your help.

<ToggleButton x:Name="TogglePlay" Width="90"
              Style="{DynamicResource TogglePlay}" 
              IsChecked="{Binding SessionData.Playing}"
              Checked="TogglePlay_Checked" Unchecked="TogglePlay_OnUnchecked"/>
<StackPanel.Resources>
    <Style x:Key="TogglePlay" TargetType="ToggleButton">
        <Style.Triggers>
            <DataTrigger Binding="{Binding IsChecked , ElementName=TogglePlay}" Value="False">
                <Setter Property="Content" Value="Play" />
            </DataTrigger>
            <DataTrigger Binding="{Binding IsChecked , ElementName=TogglePlay}" Value="True">
                <Setter Property="Content" Value="Pause" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</StackPanel.Resources>

score 1 · Answer 1 · answered Dec 12 '16 at 11:25

1

You can try to use binding mode "OneWayToSource"

answered Dec 12 '16 at 11:25

acidhills

36
1
2

Thanks. this does fix most problems. one problem is that when player stops from background, button content is not updated. – M.kazem Akhgary Dec 12 '16 at 11:37
Try to bind Content property in TwoWay/OneWay mode and IsChecked property in OneWayToSource mode. – acidhills Dec 12 '16 at 11:50
Maybe in your situation, you shoud disable IsChecked binding, and just bind Content. – acidhills Dec 12 '16 at 12:34
1

Actualy, you should understand that commonly you shouldn't use events in XAML, this is not WPF way. – acidhills Dec 12 '16 at 12:35

fire event only from user request

1 Answers1