DataGrid - 更改编辑行为 [英] DataGrid - change edit behaviour

问题描述

当我去编辑一行时，DataGrid进入编辑模式 - 这样会有效地禁用目前的单元格之外的UI通知，直到该行被提交 - 是这个预期的行为，更重要的是可以更改吗？

示例：

  public class ViewModel 
 {
 public ViewModel（）
 {
 Childs = new ObservableCollection< ChildViewModel> {new ChildViewModel（）}; 
} 
 public ObservableCollection< ChildViewModel>孩子{get;私人集合
} 
 public class ChildViewModel：INotifyPropertyChanged 
 {
 private string _firstProperty; 
 public string FirstProperty 
 {
 get {return _firstProperty; } 
 set 
 {
 _firstProperty = value; 
 _secondProperty = value; 
 OnPropetyChanged（FirstProperty）; 
 OnPropetyChanged（SecondProperty）; 
} 
} 
 
私有字符串_secondProperty; 
 public string SecondProperty 
 {
 get {return _secondProperty; } 
 set 
 {
 _secondProperty = value; 
 OnPropetyChanged（SecondProperty）; 
} 
} 
 
 private void OnPropetyChanged（string property）
 {
 if（PropertyChanged！= null）
 PropertyChanged（this，new PropertyChangedEventArgs（property））; 
} 
 public event PropertyChangedEventHandler PropertyChanged; 
} 
  

在视图中：

 < Window.Resources> 
< local：ViewModel x：Key =Data/> 
< /Window.Resources> 
< DataGrid DataContext ={Binding Source = {StaticResource Data}}ItemsSource ={Binding Childs}/> 
  

注意在离开行之前，第一列的第二个通知将被隐藏。

编辑：实现IEditableObject什么也不做：

  public class ChildViewModel：INotifyPropertyChanged，IEditableObject 
 {
 ... 
 private ChildViewModel _localCopy; 
 
 public void BeginEdit（）
 {
 _localCopy = new ChildViewModel {FirstProperty = FirstProperty，SecondProperty = SecondProperty}; 
} 
 
 public void EndEdit（）
 {
 _localCopy = null; 
} 
 
 public void CancelEdit（）
 {
 SecondProperty = _localCopy.SecondProperty; 
 FirstProperty = _localCopy.FirstProperty; 
} 
} 
  

解决方案

行为在DataGrid中使用 BindingGroup 。 DataGrid设置 ItemsControl。 ItemBindingGroup ，以便将 BindingGroup 应用于每一行。它在 MeasureOverride 中初始化，因此您可以覆盖 MeasureOverride 并将其清除：

  public class NoBindingGroupGrid 
：DataGrid 
 {
 protected override Size MeasureOverride（Size availableSize）
 {
 var desiredSize = base.MeasureOverride（availableSize）; 
 ClearBindingGroup（）; 
 return desiredSize; 
} 
 
 private void ClearBindingGroup（）
 {
 //清除ItemBindingGroup，因此不适用于新行
 ItemBindingGroup = null; 
 //在已创建的行上清除BindingGroup 
 foreach（项目中的var项目）
 {
 var row = ItemContainerGenerator.ContainerFromItem（item）as FrameworkElement; 
 row.BindingGroup = null; 
} 
} 
} 
  

I have an ObservableCollection of ChildViewModels with somewhat complex behaviour.

When I go to edit a row - the DataGrid goes into 'edit-mode' - this effectively disables UI-notifications outside the current cell until the row is committed - is this intended behaviour and more importantly can it be changed?

Example:

public class ViewModel
{
    public ViewModel()
    {
        Childs = new ObservableCollection<ChildViewModel> {new ChildViewModel()};
    }
    public ObservableCollection<ChildViewModel> Childs { get; private set; }
}
public class ChildViewModel : INotifyPropertyChanged
{
    private string _firstProperty;
    public string FirstProperty
    {
        get { return _firstProperty; }
        set
        {
            _firstProperty = value;
            _secondProperty = value;
            OnPropetyChanged("FirstProperty");
            OnPropetyChanged("SecondProperty");
        }
    }

    private string _secondProperty;
    public string SecondProperty
    {
        get { return _secondProperty; }
        set
        {
            _secondProperty = value;
            OnPropetyChanged("SecondProperty");
        }
    }

    private void OnPropetyChanged(string property)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(property));
    }
    public event PropertyChangedEventHandler PropertyChanged;
}

And in View:

<Window.Resources>
    <local:ViewModel x:Key="Data"/>
</Window.Resources>
<DataGrid DataContext="{Binding Source={StaticResource Data}}" ItemsSource="{Binding Childs}"/>

Notice how the second notification when editing first column is hidden until you leave the row.

EDIT: Implementing IEditableObject does nothing:

public class ChildViewModel : INotifyPropertyChanged,IEditableObject
{
    ...
    private ChildViewModel _localCopy;

    public void BeginEdit()
    {
        _localCopy = new ChildViewModel {FirstProperty = FirstProperty, SecondProperty = SecondProperty};
    }

    public void EndEdit()
    {
        _localCopy = null;
    }

    public void CancelEdit()
    {
        SecondProperty = _localCopy.SecondProperty;
        FirstProperty = _localCopy.FirstProperty;
    }
}

解决方案

This behavior is implemented in DataGrid using BindingGroup. The DataGrid sets ItemsControl.ItemBindingGroup in order to apply a BindingGroup to every row. It initializes this in MeasureOverride, so you can override MeasureOverride and clear them out:

public class NoBindingGroupGrid
    : DataGrid
{
    protected override Size MeasureOverride(Size availableSize)
    {
        var desiredSize = base.MeasureOverride(availableSize);
        ClearBindingGroup();
        return desiredSize;
    }

    private void ClearBindingGroup()
    {
        // Clear ItemBindingGroup so it isn't applied to new rows
        ItemBindingGroup = null;
        // Clear BindingGroup on already created rows
        foreach (var item in Items)
        {
            var row = ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement;
            row.BindingGroup = null;
        }
    }
}

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