I have a checkbox inside an ItemsControl. It has an EventTrigger both for Checked and UnChecked events. It is also bound to a Command with multiple CommandParameters. The Checked event triggers just fine.
However, the UnChecked event does not fire. What am I missing?
<ItemsControl Grid.Column ="2"
Grid.Row ="0"
ItemsSource ="{Binding ParameterOptionGroup.ParameterOptions}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding State, Converter={StaticResource BoolToEntityState}, Mode=OneWay}">
<trigger:Interaction.Triggers>
<trigger:EventTrigger EventName="Checked">
<trigger:InvokeCommandAction Command ="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}},
Path=DataContext.InitiateParameterAnswer}">
<trigger:InvokeCommandAction.CommandParameter>
<MultiBinding Converter="{StaticResource GuidAndParameterOptionToTuple}">
<Binding Path="DataContext" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type CheckBox}}"></Binding>
<Binding Path="DataContext.Id" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}"></Binding>
<Binding Path="Text" ElementName="txtRemarks" />
<Binding Source="True" />
<Binding Source="10" />
</MultiBinding>
</trigger:InvokeCommandAction.CommandParameter>
</trigger:InvokeCommandAction>
</trigger:EventTrigger>
</trigger:Interaction.Triggers>
<trigger:EventTrigger EventName="UnChecked">
<trigger:InvokeCommandAction Command ="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}},
Path=DataContext.InitiateParameterAnswer}">
<trigger:InvokeCommandAction.CommandParameter>
<MultiBinding Converter="{StaticResource GuidAndParameterOptionToTuple}">
<Binding Path="DataContext" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type CheckBox}}"></Binding>
<Binding Path="DataContext.Id" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}"></Binding>
<Binding Path="Text" ElementName="txtRemarks" />
<Binding Source="False" />
<Binding Source="5" />
</MultiBinding>
</trigger:InvokeCommandAction.CommandParameter>
</trigger:InvokeCommandAction>
</trigger:EventTrigger>
</CheckBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
As #Bort pointed out, the event name should be Unchecked instead of UnChecked.
Related
I try to pass from simple binding to MultiBinding for CommandParameter but can not find out the syntax for "{Binding}" in the following example for the multibinding example below. Thanks a lot for any hint !
Regards, Fabianus
<Button Content="Add subevent" HorizontalAlignment="Left" MinWidth="100" Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.AddEvent}" CommandParameter="{Binding}" />
CommandParameter with MultiBinding:
<Button Content="Add subevent" HorizontalAlignment="Left" MinWidth="100" Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.AddEvent}" >
<Button.CommandParameter>
<MultiBinding Converter="{StaticResource searchFilterConverter}">
<Binding Path="" />
<Binding RelativeSource="{RelativeSource Mode=FindAncestor,AncestorType=Window}" Path="DataContext.SelectedProduct" />
</MultiBinding>
</Button.CommandParameter>
</Button>
I'm trying to bind a ComboBox to DataContext.
<ComboBox ItemsSource="{Binding Path=Numbers}"
SelectedValue="{Binding Path=CurrentNumber,Mode=TwoWay}">
</ComboBox>
The above code works, but when I try to change how the items are displayed using a converter implementing IMultiValueConverter and MultiBinding nothing is displayed. I have debugged the method implementing the IMultiValueConverter and it is not getting executed. What could be the problem?
<ComboBox ItemsSource="{Binding Path=Numbers}"
SelectedValue="{Binding Path=CurrentNumber,Mode=TwoWay}">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource MultiUnitConverter}" ConverterParameter="{x:Static enumerations:Quantity.Length}" >
<Binding Path="."/>
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type Window}}" Path="DataContext.CurrentUnit"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
Update:
I tried the following instead of the ComboBox, the converter is fired and the data is loaded but not displayed!
<TextBlock>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource MultiUnitConverter}" ConverterParameter="{x:Static enumerations:Quantity.Length}" >
<Binding Path="CurrentNumber"/>
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type Window}}" Path="DataContext.CurrentUnit"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
The following works though:
<TextBlock>
<TextBlock.Text>
<Binding Path="CurrentNumber"></Binding>
</TextBlock.Text>
</TextBlock>
For all who may get stuck with this in the future and ruin their entire evening here is the solution I found!
It seems adding StringFormat solves the problem!
<ComboBox ItemsSource="{Binding Path=Numbers}" SelectedItem="{Binding Path=Number, Mode=TwoWay}">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock>
<TextBlock.Text>
<MultiBinding
Converter="{StaticResource MultiUnitConverter}"
ConverterParameter="{x:Static enumerations:Quantity.Length}"
StringFormat="{}{0:0.###}">
<Binding Path="."/>
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type Window}}" Path="DataContext.CurrentUnit"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
Did you define the converter resource somewhere else in your xaml? If not, you should do so. For instance, if your ComboBox lives in a UserControl you could add:
<UserControl.Resources>
<local:MultiUnitConverter x:Key="multiUnitConverter"/>
</UserControl.Resources>
And of course you would need to update your Converter StaticResource to match the case-sensitive Key above.
Here's my XAML:
<DataGridTemplateColumn Width="*"
CanUserResize="True"
CanUserSort="True"
Header=" Заголовок "
SortMemberPath=".">
<DataGridTemplateColumn.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="Helpers:FocusHelper.IsFocused" Value="{Binding IsEnvelopeFocused, Mode=TwoWay}"/>
</Style>
</DataGridTemplateColumn.CellStyle>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Name="txtTitle" VerticalAlignment="Center">
<TextBlock.Text>
<MultiBinding Converter="{StaticResource TitleConverter}" UpdateSourceTrigger="PropertyChanged">
<Binding Path="." />
<Binding Path="DataContext.Language" RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=UserControl}" />
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
FocusHelper starts listening for the changes of IsFocused property. But passing the value to IsEnvelopeFocused happens only once.
I cannot find the cause of this behavior.
Yes, the do.
The problem was in the binding but I have no idea why.
I have a ListView in my XAML and I am trying to hook up a MultiBinding Converter.
<ListView
Grid.Column="4"
Grid.Row="1"
Grid.RowSpan="5"
Margin="8,0,8,8"
HorizontalAlignment="Stretch"
Name="lvDisplayType"
ItemsSource="{Binding Path=Types}"
SelectedItem="{Binding Path=Current.Opt}"
VerticalAlignment="Stretch"
SelectionChanged="lvType_SelectionChanged"
SelectionMode="Single"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemTemplate>
<DataTemplate>
<DockPanel
HorizontalAlignment="Center">
<TextBlock
Text="{Binding Path=., Converter={StaticResource DisplayConverter}}"
HorizontalAlignment="Center"
Padding="6"
VerticalAlignment="Center"
TextWrapping="Wrap">
<TextBlock.ToolTip>
<ToolTip DataContext="{Binding Path=Current}">
<MultiBinding Converter="{StaticResource OptConverter}">
<Binding Path="Opt" />
<Binding Path="Type" />
</MultiBinding>
</ToolTip>
</TextBlock.ToolTip>
</TextBlock>
</DockPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
The code not working is:
<TextBlock.ToolTip>
<ToolTip DataContext="{Binding Path=Current}">
<MultiBinding Converter="{StaticResource OptConverter}">
<Binding Path="Opt" />
<Binding Path="Type" />
</MultiBinding>
</ToolTip>
</TextBlock.ToolTip>
At present the Converter is returning an empty string as both 'values[0] == System.Windows.DependencyProperty.UnsetValue' and 'values[1] == System.Windows.DependencyProperty.UnsetValue' return true. These values are never set.
Because of the logical tree (I think) the TextBlock.ToolTip default binding is 'Current.Opt'. For the MultiBinding I also need to refer to 'Type' which is another property of 'Current'. So to get around this I have set 'ToolTip DataContext="{Binding Path=Current}"' - this isn't working as expected - what am I doing wrong?
I know I could do this easily in the Code behind, but we are employing MVVM, so would like to avoid it if possible.
Any help greatly appreciated!
Thank you
Try to do it in this way,
1.Does this give DependencyProperty.UnsetValue in the Converter? Otherwise, what is coming in to the converter?
<TextBlock.ToolTip>
<MultiBinding Converter="{StaticResource OptConverter}">
<Binding RelativeSource="{RelativeSource Self}" />
<Binding RelativeSource="{RelativeSource Self}" />
</MultiBinding>
</TextBlock.ToolTip>
2.Does this give DependencyProperty.UnsetValue in the Converter?
<TextBlock.ToolTip>
<MultiBinding Converter="{StaticResource OptConverter}">
<Binding RelativeSource="{RelativeSource Self}" Path="Current"/>
<Binding RelativeSource="{RelativeSource Self}" Path="Current"/>
</MultiBinding>
</TextBlock.ToolTip>
At several points in my current application, I have an ItemTemplate such as the following:
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<ToggleButton Margin="2,0" Content="{Binding}" Tag="{Binding}" Click="ToggleButton_Click">
<ToggleButton.IsChecked>
<MultiBinding Mode="OneWay" Converter="{StaticResource EqualityConverter}">
<Binding RelativeSource="{RelativeSource Self}" Path="Tag">
</Binding>
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type cc:ToggleButtonPanel}}" Path="SelectedItem">
</Binding>
</MultiBinding>
</ToggleButton.IsChecked>
</ToggleButton>
</DataTemplate>
</ItemsControl.ItemTemplate>
Now, I've stepped through the converter and it returns true and false as expected, but the controls do not change their ischecked state... There are no binding errors, and this only happens when using an ItemsTemplate/DataTemplate combo. Has anyone else seen this behaviour?