DataGrid禁用行WPF [英] DataGrid disabling rows wpf

问题描述

我有一个DataGrid，用户只能使用绑定到视图模型的add命令输入新行。下面显示的附加行为将激活正确的单元格。

I have a DataGrid where the user can only enter new rows using an add command bound to a view model. The attached behavior shown below activates the correct cell.

我现在要做的是有效地使新行成为模态。也就是说，在新行有效并提交或取消编辑之前，我不希望用户对网格进行任何其他操作。

What I want to do now is effectively make the new row 'modal'. That is, I don't want the user to be able to do anything else with the grid until the new row is valid and committed, or the edit is cancelled.

假设我的视图模型知道它何时有效并实现IEditableObject，是否可以从附加的行为中获得所有这些？必须做什么？

Assuming my view model knows when it is valid and implements IEditableObject, can I get all of that out of my attached behavior? What must be done?

干杯，

Berryl

Cheers,
Berryl

public class NewItemAddedByCommandBehavior : Behavior<DataGrid>
{
    private MainWindowViewModel _vm;

    protected override void OnAttached()
    {
        base.OnAttached();
        AssociatedObject.DataContextChanged += OnAssociatedObject_DataContextChanged;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        AssociatedObject.DataContextChanged -= OnAssociatedObject_DataContextChanged;
        _vm.NewItemAddedByCommand -= OnNewItemAddedByCommand;
    }

    private void OnAssociatedObject_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e) {
        _vm = (MainWindowViewModel) AssociatedObject.DataContext;
        _vm.NewItemAddedByCommand += OnNewItemAddedByCommand;
    }

    private void OnNewItemAddedByCommand(object sender, EventArgs e)
    {
        var currentItem = _vm.SelectedItem;
        var col = AssociatedObject.Columns[1];
        AssociatedObject.CurrentCell = new DataGridCellInfo(currentItem, col);
        AssociatedObject.ScrollIntoView(currentItem, col);
        AssociatedObject.Focus();
        AssociatedObject.BeginEdit();
    }
}

推荐答案

< a href = https://stackoverflow.com/questions/2030143/wpf-datagrid-with-some-read-only-rows/8828485#comment17449624_8828485>这篇文章给了我一个思路，大致：

This post gave me a clue how to do this, roughly:

1. 将IsReadOnly属性添加到绑定视图模型项中


2. 将IsNew属性添加到绑定视图模型项


3. 在虚拟机中，在实际添加该项之前，请在新添加的项为时设置所有现有项IsReadOnly = true


4. 编辑或取消其编辑，将所有项目的IsReadOnly设置为false


5. 修改类似于发布答案的行为（奇怪的是，它不是可接受的答案），但是没有ReadOnlyService


6. 设置DataGridRow的样式

1. Add an IsReadOnly property to the bound view model item
2. Add an IsNew property to the bound view model item
3. In the vm, before actually adding the item, set all existing items IsReadOnly = true
4. when the newly added item is edited or its edit canceled, set IsReadOnly for all items back to false
5. Modify the behavior similar to the posting answer (which oddly enough was not the accepted answer) but without the ReadOnlyService
6. Style the DataGridRow

收获

the payoff

这篇关于DataGrid禁用行WPF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！