我有一个DataGrid
,我希望所选行和焦点行同步,即如果焦点行发生变化,那么所选行会发生变化,如果所选行发生变化,它将成为焦点行。
给定具有以下XAML的WPF窗口,如何同步聚焦和选定的行?
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.Resources>
<x:Array x:Key="MyList" Type="sys:String" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sys="clr-namespace:System;assembly=mscorlib">
<sys:String>Hello</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
<sys:String>World</sys:String>
</x:Array>
<Style TargetType="{x:Type DataGrid}">
<Setter Property="AlternationCount" Value="2" />
<Setter Property="AutoGenerateColumns" Value="False"/>
</Style>
<Style TargetType="{x:Type DataGridCell}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Focusable" Value="False"/>
</Style>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property="Focusable" Value="True"/>
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="AlternationIndex" Value="0"/>
<Condition Property="IsSelected" Value="False"/>
</MultiTrigger.Conditions>
<Setter Property="Background" Value="White"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="AlternationIndex" Value="1"/>
<Condition Property="IsSelected" Value="False"/>
</MultiTrigger.Conditions>
<Setter Property="Background" Value="Gainsboro"/>
</MultiTrigger>
<Trigger Property="AlternationIndex" Value="1">
<Setter Property="Background" Value="Gainsboro"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="#BF228B22"/>
<Setter Property="BorderBrush" Value="ForestGreen"/>
<Setter Property="BorderThickness" Value="1"/>
</Trigger>
</Style.Triggers>
</Style>
</Grid.Resources>
<DataGrid ItemsSource="{StaticResource MyList}">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding}" Width="*"/>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
使用下面的图像,您可以看到红色的焦点矩形和绿色的选定行明显不同步,因为我认为这是默认行为。我想要的是他们永远是同一个人,即SelectedRow总是聚焦,FocusedRow总是被选中。
答案 0 :(得分:2)
尝试使用附加属性来侦听DataGrid中的焦点更改和选择更改事件。当这些事情发生时,您可以通过更改选择或焦点来相应地做出反应。
这是一些示例代码。特别注意DataGridAttachment类。这就是定义附加属性的位置,以及逻辑在哪里对焦点和选择更改事件作出反应。
<强> MainWindow.xaml 强>
<Window x:Class="_15098869.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:_15098869"
Title="MainWindow"
Width="525"
Height="350">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<DataGrid Name="DataGrid"
ItemsSource="{Binding Path=Items}"
local:DataGridAttachment.SyncSelectionWithFocus="True" />
<Button Grid.Row="1"
Click="MoveSelectionButtonOnClick"
Content="Move Selection" />
</Grid>
MainWindow.xaml.cs(代码隐藏)
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
namespace _15098869
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
DataContext = this;
Items = new ObservableCollection<DemoItem>();
Items.Add(new DemoItem {FirstName = "John", LastName = "Doe"});
Items.Add(new DemoItem {FirstName = "Jane", LastName = "Doe"});
Items.Add(new DemoItem {FirstName = "Bob", LastName = "Doe"});
}
public ObservableCollection<DemoItem> Items { get; private set; }
public void MoveSelectionButtonOnClick(object sender, RoutedEventArgs e)
{
var max = DataGrid.Items.Count - 1;
DataGrid.SelectedIndex = DataGrid.SelectedIndex == max ? 0 : DataGrid.SelectedIndex + 1;
}
}
public class DemoItem
{
public string FirstName { get; set; }
public string LastName { get; set; }
}
public static class DataGridAttachment
{
public static readonly DependencyProperty SyncSelectionWithFocusProperty =
DependencyProperty.RegisterAttached("SyncSelectionWithFocus", typeof (bool), typeof (DataGridAttachment), new PropertyMetadata(default(bool), SyncSelectionWithFocusChanged));
private static void SyncSelectionWithFocusChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
var dataGrid = dependencyObject as DataGrid;
if (dataGrid == null) return;
var shouldSync = GetSyncSelectionWithFocus(dataGrid);
if (shouldSync)
{
dataGrid.AddHandler(UIElement.GotFocusEvent, new RoutedEventHandler(DataGridOnGotFocus));
dataGrid.AddHandler(Selector.SelectionChangedEvent, new SelectionChangedEventHandler(DataGridOnSelectionChanged));
}
}
private static void DataGridOnGotFocus(object sender, RoutedEventArgs e)
{
var dataGrid = sender as DataGrid;
var element = e.OriginalSource as DataGridCell;
if (dataGrid == null || element == null) return;
dataGrid.SelectedItem = element.DataContext;
}
private static void DataGridOnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
var dataGrid = sender as DataGrid;
if (dataGrid == null) return;
if (!dataGrid.IsKeyboardFocusWithin)
{
dataGrid.Focus();
}
}
public static void SetSyncSelectionWithFocus(DataGrid element, bool value)
{
element.SetValue(SyncSelectionWithFocusProperty, value);
}
public static bool GetSyncSelectionWithFocus(DataGrid element)
{
return (bool) element.GetValue(SyncSelectionWithFocusProperty);
}
}
}