EditRowViewModel Class

Contains information on a data row that a user currently edits via the edit form.

Namespace: DevExpress.XamarinForms.DataGrid

Assembly: DevExpress.XamarinForms.Grid.dll

NuGet Package: DevExpress.XamarinForms.Grid

Declaration

public class EditRowViewModel :
    INotifyPropertyChanged

Related API Members

The following members return EditRowViewModel objects:

• EditFormView.ViewModel

Remarks

An EditRowViewModel object serves as a binding context for a template that defines the presentation of the grid’s edit form (EditFormPage).

Example

This example shows how to create a custom view for the grid’s edit form and set up the grid to invoke this form when a user double taps a cell.

The grid is bound to a collection of Employee objects and contains columns to display employee information (photo, name, position, phone, address, hire and birth dates, access level, and information about vacation). A custom edit form will display an employee’s photo and name, and contain editors to modify employee’s phone and address.

Custom Edit Form

Grid Columns

Follow the steps below to implement a custom edit form.

1. Define a data template to be a content for the edit form page. In this example, it is a Xamarin.Forms.Grid with a set of labels and editors inside. Its BindingContext is an EditRowViewModel object. Use its Item property to access an object that represents a data source’s record (Employee) and bind editors to its properties.

   XAML

   <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
               xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
               xmlns:dxg="http://schemas.devexpress.com/xamarin/2014/forms/datagrid"
               x:Class="DataGridExample.MainPage">
       <ContentPage.Resources>
           <DataTemplate x:Key="CustomEditFormContent">
               <ScrollView>
                   <Grid>
                       <Grid.RowDefinitions>
                           <RowDefinition Height="Auto" />
                       </Grid.RowDefinitions>
                       <Grid.ColumnDefinitions>
                           <ColumnDefinition Width="Auto" />
                           <ColumnDefinition Width="*" />
                       </Grid.ColumnDefinitions>
                       <Image Source="{Binding Path=Item.Photo}" Grid.Row="0" Grid.Column="0"/>
                       <StackLayout Orientation="Vertical" Padding="50, 20, 0, 0" 
                                    Grid.Row="0" Grid.Column="1">
                           <Label Text="{Binding Path=Item.Name}"  VerticalOptions="Start"
                                  FontSize="20" FontAttributes="Bold" />
                           <StackLayout Orientation="Horizontal">
                               <Label Text="Phone:"  FontSize="14" WidthRequest="100"
                                      HorizontalOptions="Start" VerticalOptions="Center" />
                               <Editor Text="{Binding Path=Item.Phone, Mode=TwoWay}" 
                                       FontSize="Small" HorizontalOptions="FillAndExpand"/>
                           </StackLayout>
                           <StackLayout Orientation="Horizontal">
                               <Label Text="Address:"  FontSize="14" WidthRequest="100"
                                      HorizontalOptions="Start" VerticalOptions="Center" />
                               <Editor Text="{Binding Path=Item.Address, Mode=TwoWay}" 
                                       FontSize="Small" HorizontalOptions="FillAndExpand"/>
                           </StackLayout>
                       </StackLayout>
                   </Grid>
               </ScrollView>
           </DataTemplate>
       </ContentPage.Resources>
       <!-- ... -->
   </ContentPage>
   

2. In the grid’s DoubleTap event handler, create an EditFormPage instance and pass the specified data template to its constructor as a third parameter.

   XAML

   <dxg:DataGridView x:Name="grid" ItemsSource="{Binding Employees}" 
                     DoubleTap="DataGridView_DoubleTap">
       <!-- ... -->
   </dxg:DataGridView>
   

   C#

   using Xamarin.Forms;
   using DevExpress.XamarinForms.DataGrid;
   
   namespace DataGridExample {
       public partial class MainPage : ContentPage {
           public MainPage() {
               DevExpress.XamarinForms.DataGrid.Initializer.Init();
               InitializeComponent();
           }
   
           private void DataGridView_DoubleTap(object sender, DataGridGestureEventArgs e) {
               if (e.Item != null) {
                   var editForm = new EditFormPage(grid, grid.GetItem(e.RowHandle), 
                                   (DataTemplate)Resources["CustomEditFormContent"]);
                   Navigation.PushAsync(editForm);
               }
           }
       }
   }
   

3. In the App.xaml.cs file, assign a NavigationPage instance to the Application.MainPage property and add the MainPage content page to the navigation stack (the application’s root page):

   C#

   namespace DataGridExample {
       public partial class App : Application {
           public App() {
               InitializeComponent();
   
               // MainPage = new MainPage();
               MainPage = new NavigationPage(new MainPage());
           }
   
           // ...
       }
   }
   

View Example

Implements

INotifyPropertyChanged

Inheritance

Object

EditRowViewModel