XAML WPF DataGrid - SingleClick zamienieł się w DoubleClick

Question

Wprowadziłem do projektu LostFocus dla zachowania oryginalnego podświetlenia itema w DataGridzie po tym jak zniknie defaultowe, zepsuło mi to jednak możliwość przeskakiwania go kolejnego wiersza za pomocą pojedynczego kliknięcia. Teraz aby podświetlić kolejnego itema muszę kliknąć dwa razy chyba że pierwszym kliknięciem będzie wybranie innego elementu z poza DataGrid czyli np TextBox.

Nie proszę o naprawę kodu tylko wyjaśnienie od strony teoretycznej co się nawyprawiało bo nawet nie wiem jak to ugryźć.

Answer 1

Może zrób podświetlanie item-a po utracie focus-a przez DataGrid bez używania zdarzenia LostFocus, ale za pomocą <Style.Triggers>

 

przykład

MainWindow.xaml

<Window x:Class = "WPFDataGridControl.MainWindow"
   xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
   xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml"
   Title = "MainWindow" Height = "348" Width = "279">

    <Grid Width="502">
        <DataGrid Name = "dataGrid" AlternatingRowBackground = "LightBlue"  
                  AlternationCount = "2" AutoGenerateColumns = "False" Margin="12,12,251,134">

            <DataGrid.Columns>
                <DataGridTextColumn Header = "Name" Binding = "{Binding Name}" />
                <DataGridTextColumn Header = "Surname" Binding = "{Binding Surname}" />
                <DataGridCheckBoxColumn Header = "Is on holiday?" Binding = "{Binding IsOnHoliday}" />
            </DataGrid.Columns>
            <DataGrid.CellStyle>
                <Style TargetType="DataGridCell">
                    <Style.Triggers>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter Property="Background" Value="Green" />
                            <Setter Property="BorderBrush" Value="Darkgreen" />
                            <Setter Property="TextElement.Foreground" Value="White"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.CellStyle>

        </DataGrid>
        <TextBox Height="27" HorizontalAlignment="Left" Margin="12,181,0,0"
                 Name="textBox" VerticalAlignment="Top" Width="239" />
    </Grid>

</Window>

 

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace WPFDataGridControl
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml 
    /// </summary>

    public partial class MainWindow : Window
    {
        private string PlaceholderText = "Zaznacz wiersz w DG i wstaw tu kursor";
        public MainWindow()
        {
            InitializeComponent();
            dataGrid.ItemsSource = Employee.GetEmployees();

            textBox.Text = PlaceholderText;
            textBox.LostFocus += AddPlaceholder;
            textBox.GotFocus += RemovePlaceholder;
        }

        public void RemovePlaceholder(object sender, EventArgs e)
        {
            if (textBox.Text == PlaceholderText)
                textBox.Text = String.Empty;
        }

        public void AddPlaceholder(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(textBox.Text))
                textBox.Text = PlaceholderText;
        }
    }

    public class Employee : INotifyPropertyChanged
    {
        private string name;
        public string Name
        {
            get { return name; }
            set
            {
                name = value;
                RaiseProperChanged();
            }
        }

        private string surname;
        public string Surname
        {
            get { return surname; }
            set
            {
                surname = value;
                RaiseProperChanged();
            }
        }

        private bool isOnHoliday;
        public bool IsOnHoliday
        {
            get { return isOnHoliday; }
            set
            {
                isOnHoliday = value;
                RaiseProperChanged();
            }
        }

        public static ObservableCollection<Employee> GetEmployees()
        {
            var employees = new ObservableCollection<Employee>();

            employees.Add(new Employee()
            {
                Name = "Mariusz",
                Surname = "Kowalski",
                IsOnHoliday = true
            });

            employees.Add(new Employee()
            {
                Name = "Jacek",
                Surname = "VBService",
                IsOnHoliday = false
            });

            employees.Add(new Employee()
            {
                Name = "Katarzyna",
                Surname = "Mazur",
                IsOnHoliday = true
            });

            employees.Add(new Employee()
            {
                Name = "Tomasz",
                Surname = "Lewandowski",
                IsOnHoliday = false
            });

            employees.Add(new Employee()
            {
                Name = "Kamil",
                Surname = "Zamojski",
                IsOnHoliday = true
            });

            employees.Add(new Employee()
            {
                Name = "Magdalena",
                Surname = "Piasecka",
                IsOnHoliday = false
            });

            return employees;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void RaiseProperChanged([CallerMemberName] string caller = "")
        {

            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(caller));
        }
    }
}

 

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