Focusing on new row when pressing add expense

goggi9999 · Feb 11, 2020 · 4a2a659 · 4a2a659
1 parent a3a320b
commit 4a2a659
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Showing 2 changed files with 52 additions and 1 deletion.
diff --git a/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.cs b/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.cs
@@ -1,7 +1,13 @@
 // // Copyright (c) Microsoft. All rights reserved.
 // // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+using System;
 using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Data;
+using System.Windows.Input;
+using System.Windows.Media;
 
 namespace ExpenseItDemo
 {
@@ -15,11 +21,55 @@ public CreateExpenseReportDialogBox()
             InitializeComponent();
         }
 
+
         private void addExpenseButton_Click(object sender, RoutedEventArgs e)
         {
             var app = Application.Current;
             var expenseReport = (ExpenseReport) app.FindResource("ExpenseData");
             expenseReport?.LineItems.Add(new LineItem());
+            DataGridRow row =null;
+            this.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Loaded, new Action(() =>
+            {
+                row = expenseDataGrid1.ItemContainerGenerator.ContainerFromIndex(expenseDataGrid1.Items.Count - 1) as DataGridRow;
+                if (row != null)
+                {
+                    expenseDataGrid1.SelectedItem = row.DataContext;
+                    DataGridCell cell = GetCell(expenseDataGrid1, row, 0);
+                    if (cell != null)
+                    {
+                        expenseDataGrid1.CurrentCell = new DataGridCellInfo(cell);
+                        Keyboard.Focus(cell);
+                    }
+                }
+            }));
+        }
+        private static DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
+        {
+            if (rowContainer != null)
+            {
+                DataGridCellsPresenter presenter = RecursiveVisualChildFinder(rowContainer);
+                if (presenter != null)
+                    return presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
+            }
+            return null;
+        }
+
+        private static DataGridCellsPresenter RecursiveVisualChildFinder(DependencyObject myObj)
+        {
+            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(myObj); i++)
+            {
+                // Retrieve child visual at specified index value.
+                DependencyObject childObj = VisualTreeHelper.GetChild(myObj, i);
+
+                // Do processing of the child visual object.
+                if(childObj is DataGridCellsPresenter)
+                {
+                    return (DataGridCellsPresenter)childObj;
+                }
+                // Enumerate children of the child visual object.
+                return RecursiveVisualChildFinder(childObj);
+            }
+            return null;
         }
 
         private void viewChartButton_Click(object sender, RoutedEventArgs e)

diff --git a/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.xaml b/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.xaml
@@ -123,7 +123,8 @@
                           ItemsSource="{Binding LineItems}"
                           HeadersVisibility="Column"
                           Name="expenseDataGrid1"
-                          AutoGenerateColumns="False">
+                          AutoGenerateColumns="False"
+                          CanUserAddRows="False">
                     <DataGrid.ToolTip>
                         <TextBlock>Expense Report</TextBlock>
                     </DataGrid.ToolTip>