我遇到了一些用户控件的问题，我将它放在一起，这是一种用户可以放置对象的方向键，然后将新对象放在drop的方向上。我已经使用EventTriggers连接突出显示，它似乎在95％的时间内正常工作 - 例如。用户在控件上拖动一些东西，相应的控件突出显示。用户拖拽项目或将其放在突出显示的控件上，控件不会突出显示。问题在于，有时候，特别是当快速移动拖动的对象围绕多个方向控件时，某些控件无法失去高光。我根本没有在代码隐藏中做任何事情，唯一能驱动它的是这个xaml。
有什么想法吗？
CrossDropControl.xaml用户控制 - 无后面代码
<UserControl x:Class="EventTriggersDemo.CrossDropControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:EventTriggersDemo"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.Resources>
<Style x:Key="DirectionalBorderStyle"
TargetType="Border">
<Setter Property="Height" Value="28" />
<Setter Property="Width" Value="28" />
<Setter Property="Background" Value="#FF323232" />
<Setter Property="BorderBrush" Value="Black" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="AllowDrop" Value="True" />
<Style.Triggers>
<EventTrigger RoutedEvent="DragEnter">
<BeginStoryboard x:Name="DragEnterStoryboard">
<Storyboard>
<ColorAnimation Duration="0:0:0.1"
Storyboard.TargetProperty="Background.Color"
To="LightBlue" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="DragLeave">
<StopStoryboard BeginStoryboardName="DragEnterStoryboard" />
</EventTrigger>
<EventTrigger RoutedEvent="Drop">
<StopStoryboard BeginStoryboardName="DragEnterStoryboard" />
</EventTrigger>
</Style.Triggers>
</Style>
<Style x:Key="DirectionalShapeStyle"
TargetType="Shape">
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="Fill" Value="Gray" />
</Style>
</UserControl.Resources>
<Grid>
<Border Name="dropPopupControl"
Width="98"
Height="98">
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Path x:Name="CompassBodyIcon"
Grid.RowSpan="3"
Grid.ColumnSpan="3"
Width="98"
Height="98"
Data="F1 M 0,32.0045L 21.0029,32.0045L 32.0045,21.0029L 32.0045,7.62939e-006L 66.0092,7.62939e-006L 66.0092,21.0029L 77.0107,32.0045L 98.0137,32.0045L 98.0137,66.0092L 77.0107,66.0092L 66.0092,77.0107L 66.0092,98.0137L 32.0045,98.0137L 32.0045,77.0107L 21.0029,66.0092L 0,66.0092L 0,32.0045 Z "
Fill="Gray"
SnapsToDevicePixels="True"
Stretch="Fill"
Stroke="Black" />
<Border x:Name="PART_LeftIndicator"
Grid.Row="1"
Grid.Column="0"
Margin="2,0,0,0"
Style="{StaticResource DirectionalBorderStyle}">
<Path x:Name="LeftPlacementIndicator"
Data="F1 M 7.00043,13.0018L 22.0025,22.0031L 22.0025,4.00056L 7.00043,13.0018 Z "
Style="{StaticResource DirectionalShapeStyle}" />
</Border>
<Border x:Name="PART_RightIndicator"
Grid.Row="1"
Grid.Column="2"
Margin="0,0,2,0"
Style="{StaticResource DirectionalBorderStyle}">
<Path x:Name="RightHighlightVisual"
Data="F1 M 19.0025,13.0018L 4.00042,4.00056L 4.00042,22.0031L 19.0025,13.0018 Z "
Style="{StaticResource DirectionalShapeStyle}" />
</Border>
<Border x:Name="PART_BottomIndicator"
Grid.Row="2"
Grid.Column="1"
Margin="0,0,0,2"
Style="{StaticResource DirectionalBorderStyle}">
<Path x:Name="BottomPlacementIndicator"
Data="F1 M 12.9824,19.002L 21.9837,3.99995L 3.98116,3.99995L 12.9824,19.002 Z "
Style="{StaticResource DirectionalShapeStyle}" />
</Border>
<Border x:Name="PART_TopIndicator"
Grid.Column="1"
Margin="0,2,0,0"
Style="{StaticResource DirectionalBorderStyle}">
<Path x:Name="TopPlacementIndicator"
Data="F1 M 13.0022,7.021L 4.0009,22.0231L 22.0034,22.0231L 13.0022,7.021 Z "
Style="{StaticResource DirectionalShapeStyle}" />
</Border>
<Border x:Name="PART_CenterIndicator"
Grid.Row="1"
Grid.Column="1"
Margin="2"
Style="{StaticResource DirectionalBorderStyle}">
<Ellipse Margin="4"
Style="{StaticResource DirectionalShapeStyle}" />
</Border>
</Grid>
</Border>
</Grid>
</UserControl>
MainWindow.xaml
<Window x:Class="EventTriggersDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:EventTriggersDemo"
mc:Ignorable="d"
Title="MainWindow"
Height="350"
Width="525">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<ListBox x:Name="dragListBox" PreviewMouseMove="UIElement_OnPreviewMouseMove">
<ListBox.Items>
<ListBoxItem>Item 1</ListBoxItem>
<ListBoxItem>Item 2</ListBoxItem>
<ListBoxItem>Item 3</ListBoxItem>
</ListBox.Items>
</ListBox>
<local:CrossDropControl Grid.Column="1" />
</Grid>
</Window>
// MainWindow.xaml.cs
using System.Windows;
using System.Windows.Input;
namespace EventTriggersDemo
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void UIElement_OnPreviewMouseMove(object sender, MouseEventArgs e)
{
// Get some mock drag data
var dragData = new DataObject("Test Data");
DragDrop.DoDragDrop(dragListBox, dragData, DragDropEffects.Move);
}
}
}
在准备此示例时我注意到，删除由Border控件包装的* PlacementIndicator路径似乎要么完全删除此问题，要么将其最小化到导致我无法重现它的程度。我不明白这会如何影响这种行为......
有什么想法吗？