GridView DoubleClick

Question

我有一个GridView,我想在列表中的项目上检测doubleclick事件,我按如下方式执行:

<ListView>
    <ListView.View >
        <GridView >
            <GridViewColumn Header="FileName">
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <Label Content="{Binding FileName}" MouseDoubleClick="Configuration_MouseDoubleClick"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn DisplayMemberBinding="{Binding CreationDate}" Header="Date"/>
        </GridView>
     </ListView.View>
</ListView>

问题是我只能通过将双击附加到模板中的控件来检测双击.

我怎样才能把这MouseDoubleClick件事附加到整体上ListViewItem？PRISM有没有解决方案？

Answer 1

您可以像这样在ItemContainerStyle中将MouseDoubleClick事件添加到ListViewItem

<ListView ...>
    <ListView.ItemContainerStyle>
        <Style TargetType="{x:Type ListViewItem}">
            <EventSetter Event="MouseDoubleClick" Handler="ListViewItem_MouseDoubleClick"/>
        </Style>
    </ListView.ItemContainerStyle>
</ListView>

代码背后..

void ListViewItem_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    //...            
}

Answer 2

如果您正在使用MVVM,您可以通过常规方式弥补代码隐藏和视图模型之间的差距 - 使用附加行为:

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

public sealed class HandleDoubleClickBehavior
{
    public static readonly DependencyProperty CommandProperty = DependencyProperty.RegisterAttached(
        "Command", typeof (ICommand), typeof (HandleDoubleClickBehavior), new PropertyMetadata(default(ICommand), OnComandChanged));

    public static void SetCommand(DependencyObject element, ICommand value)
    {
        element.SetValue(CommandProperty, value);
    }

    public static ICommand GetCommand(DependencyObject element)
    {
        return (ICommand) element.GetValue(CommandProperty);
    }

    public static readonly DependencyProperty CommandParameterProperty = DependencyProperty.RegisterAttached(
        "CommandParameter", typeof (object), typeof (HandleDoubleClickBehavior), new PropertyMetadata(default(object)));

    public static void SetCommandParameter(DependencyObject element, object value)
    {
        element.SetValue(CommandParameterProperty, value);
    }

    public static object GetCommandParameter(DependencyObject element)
    {
        return (object) element.GetValue(CommandParameterProperty);
    }

    private static void OnComandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var c = d as Control;
        if (c == null)
            throw new InvalidOperationException($"can only be attached to {nameof(Control)}");
        c.MouseDoubleClick -= OnDoubleClick;
        if (GetCommand(c) != null)
            c.MouseDoubleClick += OnDoubleClick;
    }

    private static void OnDoubleClick(object sender, MouseButtonEventArgs e)
    {
        var d = sender as DependencyObject;
        if (d == null)
            return;
        var command = GetCommand(d);
        if (command == null)
            return;
        var parameter = GetCommandParameter(d);
        if (!command.CanExecute(parameter))
            return;
        command.Execute(parameter);
    }
}

与你的工具箱中,你可以写XAML像这样(假设PersonViewModel包含字符串性质Name和Title,和ICommand命名属性SayHiCommand期望一个字符串参数):

<ListView ItemsSource="{Binding Persons}" >
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="local:HandleDoubleClickBehavior.Command" Value="{Binding SayHiCommand}" />
            <Setter Property="local:HandleDoubleClickBehavior.CommandParameter" Value="{Binding Name}" />
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" />
            <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Title}" />
        </GridView>
    </ListView.View>
</ListView>