自定义 Datagrid OnKeyDown 检查 IsEnabled 项

Question

我有一个包含静态数据的数据网格，其中两个项目被禁用。唯一的问题是 Silverlight 在使用箭头键浏览数据网格项目时禁用的项目也得到关注。

我创建了一个自定义数据网格 class 并在 XAML 中引用了它，然后在使用 OnKeyDown 事件时我检查 IsEnabled 是 True 还是 False。但到目前为止它没有得到正确的值，我认为这是因为我在设置 IsEnabled 状态的地方引用了默认的 Datagrid class?

CustomDataGrid

public class CustomGrid : DataGrid
    {
        protected override void OnKeyDown(KeyEventArgs e)
        {
            if(IsEnabled != false)
                base.OnKeyDown(e);
        }
    }

Xaml

  <UserControl.Resources>
        <Style x:Key="DataGridStyle1" TargetType="local:CustomGrid">
            <Setter Property="RowStyle">
                <Setter.Value>
                    <Style TargetType="sdk:DataGridRow">
                        <Setter Property="IsEnabled" Value="{Binding enabled}"/> //CheckIsEnabled Value
                    </Style>
                </Setter.Value>
            </Setter>...

<local:CustomGrid x:Name="McDataGrid" HorizontalAlignment="Left" Height="500" VerticalAlignment="Top" Width="400" Style="{StaticResource DataGridStyle1}"/>

列表数据

 private List<Model> Data()
        {
            list.Add(new Model(1, "Test", "1", true));
            list.Add(new Model(2, "Ger", "2", true));
            list.Add(new Model(3, "dsg", "3", true));
            list.Add(new Model(4, "Hd", "4", false));
            list.Add(new Model(5, "TeHRFdgst", "5", false));
            return list;
        }

        public class Model : INotifyPropertyChanged
        {
            public bool _enabled;
            public int Id { get; set; }
            public string Name { get; set; }
            public string Prop { get; set; }
            public bool enabled
            {
                get { return _enabled; }

                set
                {
                    _enabled = value;
                    OnPropertyChanged("enabled");
                }
            }

            public event PropertyChangedEventHandler PropertyChanged;

            public Model(int id, string name, string prop, bool isenabled)
            {
                Id = id;
                Name = name;
                Prop = prop;
                enabled = isenabled;

            }

            protected virtual void OnPropertyChanged(string propertyName)
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }

当我用 "local:CustomGrid" 更改此 <Style TargetType="sdk:DataGridRow"> 部分时，我的整个网格都变成空白，不知道为什么。

是否有关于如何完成此操作或其他方法的建议？

Answer 1

尝试这样的事情：

public class CustomGrid : DataGrid
{
    private List<Model> models;
    public CustomGrid()
    {
        Loaded += (s,e) => models = ItemsSource as List<Model>;
    }

    protected override void OnKeyDown(KeyEventArgs e)
    {
        if (models == null)
            return;

        Model model = CurrentItem as Model;
        if (model == null)
            return;

        int index = models.IndexOf(model);
        switch (e.Key)
        {
            case Key.Down:
                //is the next model disabled?
                if (index < models.Count - 1 && !models[index + 1].enabled)
                    e.Handled = true;
                break;
            case Key.Up:
                if (index > 0 && !models[index - 1].enabled)
                    e.Handled = true;
                break;
        }
    }
}

XAML:

<UserControl ...>
    <UserControl.Resources>
        <Style x:Key="DataGridStyle1" TargetType="local:CustomGrid">
            <Setter Property="RowStyle">
                <Setter.Value>
                    <Style TargetType="sdk:DataGridRow">
                        <Setter Property="IsEnabled" Value="{Binding enabled}"/>
                    </Style>
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <local:CustomGrid x:Name="McDataGrid" Style="{StaticResource DataGridStyle1}" />
    </Grid>
</UserControl>

自定义 Datagrid OnKeyDown 检查 IsEnabled 项

Custom Datagrid OnKeyDown check IsEnabled Items

c#

wpf

xaml

silverlight

datagrid