当鼠标移动时突出显示 WPF DataGrid 上的列

Question

我希望当鼠标移动时突出显示 WPF 数据网格上的列。我面临的一些问题是：

• 获取列的坐标，以在鼠标悬停在列上时进行测试
• 更改列的背景颜色

任何帮助将不胜感激。

Answer 1

如何更新 DataGridCell 的样式并在其中定义“IsMouseOver”触发器？像这样的东西：

<DataGrid x:Name="dg">
    <DataGrid.Resources>
        <Style x:Key="{x:Type DataGridCell}" TargetType="{x:Type DataGridCell}">
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter Property="Background" Value="LightGray"/>
                </Trigger>
                <Trigger Property="IsSelected" Value="true">
                    <Setter Property="Background" Value="Blue" />
                    <Setter Property="Foreground" Value="White" />
                    <Setter Property="BorderBrush" Value="Black" />
                </Trigger>
                <Trigger Property="IsKeyboardFocusWithin" Value="true">
                    <Setter Property="BorderBrush" Value="Gray" />
                </Trigger>
            </Style.Triggers>
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="BorderBrush" Value="Transparent" />
            <Setter Property="BorderThickness" Value="1" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type DataGridCell}">
                        <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="true">
                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DataGrid.Resources>
</DataGrid>

编辑：

下面是一个解决方案：1) 突出显示当前悬停的单元格，2) 突出显示整行，3) 突出显示整列。我只是快速编写了此代码，尚未对其进行彻底测试，因此您可能会遇到一些问题。但无论如何，这应该能让您了解如何完成这些任务。

我的突出显示整个列的解决方案涉及使用两个附加属性，当鼠标悬停在 DataGridCell 上时，这些属性被分配给 DataGridCell。只需检查一下，看看它是否适合您。

XAML：

<Window x:Class="StackOverflow.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:StackOverflow"
        Title="MainWindow" Height="350" Width="525">
    <DataGrid x:Name="dg" AutoGenerateColumns="True">
        <DataGrid.Resources>
            <Style x:Key="{x:Type DataGridCell}" TargetType="{x:Type DataGridCell}">
                <Setter Property="Background" Value="Transparent" />
                <Setter Property="BorderBrush" Value="Transparent" />
                <Setter Property="BorderThickness" Value="1" />
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type DataGridCell}">
                            <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="true">
                                <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
                <Style.Triggers>
                    <Trigger Property="local:DataGridBehavior.IsCellHighlighted" Value="True">
                        <Setter Property="Background" Value="LightGray"/>
                    </Trigger>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="local:DataGridBehavior.HighlightColumn" Value="True"/>
                        <Setter Property="Background" Value="Green"/>
                    </Trigger>
                    <Trigger Property="IsSelected" Value="true">
                        <Setter Property="Background" Value="Blue" />
                        <Setter Property="Foreground" Value="White" />
                        <Setter Property="BorderBrush" Value="Black" />
                    </Trigger>
                    <Trigger Property="IsKeyboardFocusWithin" Value="true">
                        <Setter Property="BorderBrush" Value="Gray" />
                    </Trigger>
                </Style.Triggers>
            </Style>
            <Style TargetType="{x:Type DataGridRow}">
                <Style.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="LightGray"/>
                    </Trigger>
                </Style.Triggers>
            </Style>
        </DataGrid.Resources>
    </DataGrid>
</Window>

DataGridBehavior 类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Interactivity;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Controls.Primitives;

namespace StackOverflow
{
    public class DataGridBehavior : DependencyObject
    {

        public static bool GetHighlightColumn(DependencyObject obj)
        {
            return (bool)obj.GetValue(HighlightColumnProperty);
        }

        public static void SetHighlightColumn(DependencyObject obj, bool value)
        {
            obj.SetValue(HighlightColumnProperty, value);
        }

        // Using a DependencyProperty as the backing store for HighlightColumn.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty HighlightColumnProperty =
            DependencyProperty.RegisterAttached("HighlightColumn", typeof(bool), 
            typeof(DataGridBehavior), new FrameworkPropertyMetadata(false, OnHighlightColumnPropertyChanged));



        public static bool GetIsCellHighlighted(DependencyObject obj)
        {
            return (bool)obj.GetValue(IsCellHighlightedProperty);
        }

        public static void SetIsCellHighlighted(DependencyObject obj, bool value)
        {
            obj.SetValue(IsCellHighlightedProperty, value);
        }

        // Using a DependencyProperty as the backing store for IsCellHighlighted.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IsCellHighlightedProperty =
            DependencyProperty.RegisterAttached("IsCellHighlighted", typeof(bool), typeof(DataGridBehavior), 
            new UIPropertyMetadata(false));



        private static void OnHighlightColumnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            Console.WriteLine(e.NewValue);
            DataGridCell cell = sender as DataGridCell;

            if (cell != null) 
            {
                DataGrid dg = GetDataGridFromCell(cell);
                DataGridColumn column = cell.Column;

                for (int i = 0; i < dg.Items.Count; i++) 
                {
                    DataGridRow row = dg.ItemContainerGenerator.ContainerFromIndex(i) as DataGridRow;
                    DataGridCell currentCell = GetCell(row, column);
                    if (currentCell != null)
                    {
                        currentCell.SetValue(DataGridBehavior.IsCellHighlightedProperty, e.NewValue);
                    }
                }

            }
        }

        private static DataGrid GetDataGridFromCell(DataGridCell cell)
        { 
            DataGrid retVal = null;
            FrameworkElement fe = cell;
            while ((retVal == null) && (fe != null))
            {
                if (fe is DataGrid)
                    retVal = fe as DataGrid;
                else
                    fe = VisualTreeHelper.GetParent(fe) as FrameworkElement;
            }
            return retVal;
        }

        private static DataGridCell GetCell(DataGridRow row, DataGridColumn column) 
        {
            DataGridCell retVal = null;
            DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
            if (presenter != null)
            {
                for (int i = 0; i < presenter.Items.Count; i++)
                {
                    DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(i) as DataGridCell;
                    if ((cell != null) && (cell.Column == column))
                    {
                        retVal = cell;
                        break;
                    }
                }
            }

            return retVal;
        }

        private static T GetVisualChild<T>(Visual parent) where T : Visual
        {
            T child = default(T);
            int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < numVisuals; i++)
            {
                Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
                child = v as T;
                if (child == null)
                {
                    child = GetVisualChild<T>(v);
                }
                if (child != null)
                {
                    break;
                }
            }
            return child;
        }
    }
}