Question

我正在处理我的第一个UWP应用，我想创建一个像这样的用户界面。对于每个列表项（项目），那里将是一组按钮。对于某些列表项（项目），某些按钮将被禁用一些。因此，我需要在这些列表项（项目）中禁用和更改此类按钮的图像。

我尝试使用像这样的列表视图来实现它。但我不确定如何根据条件启用/禁用其中一些按钮。

尝试添加DataContextChanged事件并尝试访问那里的按钮。但不确定我如何访问这些按钮。

请让我知道以下方法是否正确，或者是否有更好的方法来完成我在上图中尝试实现的目标。

 <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>

Answer 1

答案是变量取决于你已经使用了什么结构，所以我将做出一些假设并推动它。

首先，我假设您的ViewModel有ObservableCollection名为ProjectList且此ProjectList由ProjectModel组成

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;
}

在ViewModel你应该

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

最后在您的View

中

    <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>

更改摘要

您的ListView绑定的集合中的模型需要包含Buttons绑定到
在View中，将Buttons绑定到新属性

Listview项目中的UWP按钮

1 个答案: