XAML如何创建一个TextBlock响应式？

Question

I have the following XAML code :

<ListBox.ItemTemplate>
    <DataTemplate>
        <Grid Background="Transparent" Loaded="OnGridLoaded">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="5" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <TextBlock Foreground="{StaticResource CaptionColorBrush}" Text="&gt;" />
            <TextBlock Grid.Column="1" Background="Transparent" Style="{StaticResource BreadCrumsTextBlock}" 
                FontWeight="{Binding IsLastElement, Converter={StaticResource LastElementToFontWeightConverter}}"
                Text="{Binding Title}" Margin="5 0 0 0" TextTrimming="CharacterEllipsis" />
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="PreviewMouseLeftButtonDown">
                    <command:EventToCommand Command="{Binding Mode=OneWay, Path=DataContext.ReturnToFolderCommand, ElementName=ChannelsTab}" CommandParameter="{Binding NodeId}" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </Grid>
    </DataTemplate>
</ListBox.ItemTemplate>

I want to make TextBlock to show all text send. For example if I resize (expand) it will display only the text is send for the first time (suppose the screen is restored down). Can anyone help me to fix the problem?

Answer 1

The class that contains Title must implement INotifyPropertyChanged Your class needs to look something like this:

public class Model : INotifyPropertyChanged
{
    //This is all that the interface requires
    public event PropertyChangedEventHandler PropertyChanged;

    private string _title;
    public string Title
    {
        get { return _title; }
        set
        {
            _text = value;
            if(PropertyChanged != null)
                PropertyChange(this, new PropertyChangedEventArgs("Title")); 
        }
    }
}

If this is a complex project, I suggest you use an MVVM Framework like MVVM-Light http://www.mvvmlight.net/ I have used it in the past for Xamarin development. However, there are many other alternatives.

One of the advantages of MVVM, is you completely decouple the XAML(GUI) from the source. I normally use separate projects to contain the MVVM and XAML. You can then create unit tests to exercise the MVVM.