UWP buttons inside Listview items

问题

I'm working on my first UWP app and I want create a UI like this

. For each list item (project) there'll be a set of buttons. For certain list items(projects) some of these buttons will be disabled some times. So I need to disable and change the image for such button in those list items(projects).

I tried to implement it using a list view like this. But I am not sure how I can enable/disable some of those buttons depending on the condition.

Tried adding a DataContextChanged event and trying to access the buttons there. But not sure how I can access those buttons.

Please let me know whether the following approach is correct or is there a better way to do what I am trying to achieve in the above image.

 <ListView x:Name="stepsListView" Margin="10,0,0,0" RequestedTheme="Dark" FontSize="24" Background="{StaticResource procedure_app_white}" Foreground="Black" BorderThickness="1.5" BorderBrush="Transparent" ItemsSource="{Binding projectList}"  HorizontalAlignment="Left">
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        </Style>
    </ListView.ItemContainerStyle>

    <!-- Item -->
    <ListView.ItemTemplate>
        <DataTemplate>
            <Border BorderThickness="0,0,0,1" BorderBrush="#c0c0c0">
                <Grid Width="auto" HorizontalAlignment="Stretch" DataContextChanged="Grid_DataContextChanged" >
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"/>
                        <RowDefinition Height="50"/>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="100"/>
                        <ColumnDefinition Width="100"/>
                        <ColumnDefinition Width="100"/>
                        <ColumnDefinition Width="100"/>
                        <ColumnDefinition Width="100"/>
                        <ColumnDefinition Width="100"/>
                    </Grid.ColumnDefinitions>
                    <TextBlock VerticalAlignment="Center" FontSize="30" Grid.Row="0" Grid.ColumnSpan="7" Text="{Binding projectName}" Foreground="{StaticResource procedure_app_orange_text }" />

                    <Button x:Name="warningButton" Width="40" Height="40" Grid.Column="1"  Grid.Row="1" Tag="{Binding projectId}" Click="warningButtonClick" Foreground="{StaticResource procedure_app_orange_text }">
                        <Button.Background>
                            <ImageBrush ImageSource="Asset/step_ncwr.png">
                            </ImageBrush>
                        </Button.Background>
                    </Button>
                    <Button x:Name="commentButton" Width="40" Height="40" Grid.Column="2"   Grid.Row="1"  Tag="{Binding projectId}" Click="CommentButtonClick" Foreground="{StaticResource procedure_app_orange_text }" IsTapEnabled="True">
                    <Button.Background>
                        <ImageBrush ImageSource="Asset/step_comment.png">
                        </ImageBrush>
                    </Button.Background>
                    </Button>
                    <Button x:Name="imageButton" Width="40" Height="40" Grid.Column="3"  Grid.Row="1"  Tag="{Binding projectId}" Click="ImageButtonClick" Foreground="{StaticResource procedure_app_orange_text }">
                        <Button.Background>
                            <ImageBrush ImageSource="Asset/step_image.png">
                            </ImageBrush>
                        </Button.Background>
                    </Button>
                </Grid>
            </Border>
        </DataTemplate>
    </ListView.ItemTemplate>

回答1:

The answer is to variable dependent on what structure you've gone with so I am going to make some assumptions and roll with it.

First I am going to assume your ViewModel has an ObservableCollection called ProjectList and that this ProjectList is made up of ProjectModel's

ProjectModel.cs

public class ProjectModel : INotifyPropertyChanged{
      private bool _isNcwrEnabled;
      public bool IsNcwrEnabled{
          get{ return _isNcwrEnabled; }
          set{ _isNcwrEnabled = value; OnPropertyChanged("IsNcwrEnabled"); }
      }
      private bool _isCommentEnabled;
      public bool IsCommentEnabled{
          get{ return _isCommentEnabled; }
          set{ _isCommentEnabled= value; OnPropertyChanged("IsCommentEnabled"); }
      }
      private bool _isImageEnabled;
      public bool IsImageEnabled{
          get{ return _isImageEnabled; }
          set{ _isImageEnabled= value; OnPropertyChanged("IsImageEnabled"); }
      }

    public void OnPropertyChanged(String prop)
    {
        PropertyChangedEventHandler handler = PropertyChanged;

        if (handler != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(prop));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

In your ViewModel you should have

ObservableCollection<ProjectModel> ProjectList {get; private set; }

Finally in your View

    <Button IsEnabled="{Binding IsNcwrEnabled}" x:Name="warningButton" Width="40" Height="40" Grid.Column="1"
            Grid.Row="1" Tag="{Binding projectId}" Click="warningButtonClick" 
            Foreground="{StaticResource procedure_app_orange_text }">
         <Button.Background>
             <ImageBrush ImageSource="Asset/step_ncwr.png"/>
         </Button.Background>
    </Button>
    <Button IsEnabled="{Binding IsCommentEnabled}" x:Name="commentButton" Width="40" Height="40" Grid.Column="2"
            Grid.Row="1"  Tag="{Binding projectId}" Click="CommentButtonClick" 
            Foreground="{StaticResource procedure_app_orange_text }" IsTapEnabled="True">
         <Button.Background>
             <ImageBrush ImageSource="Asset/step_comment.png"/>
         </Button.Background>
     </Button>
     <Button IsEnabled="{Binding IsImageEnabled}" x:Name="imageButton" Width="40" Height="40" Grid.Column="3"
             Grid.Row="1"  Tag="{Binding projectId}" Click="ImageButtonClick" 
             Foreground="{StaticResource procedure_app_orange_text }">
         <Button.Background>
             <ImageBrush ImageSource="Asset/step_image.png"/>
         </Button.Background>
     </Button>

Summary of Changes

The models in the collection that your ListView is bound to needs to contain enabled properties for your Buttons to bind to
In your View, bind your Buttons to your new properties

来源：https://stackoverflow.com/questions/38355305/uwp-buttons-inside-listview-items

标签

xaml

listview

uwp

uwp-xaml