wpf - 鼠标悬停在图像控件上时显示弹出窗口

Question

我想在鼠标悬停在图像控件上时显示弹出窗口。所以我创建了控制模板，它看起来像这样:

        <ControlTemplate x:Key="AvatarImageTemplate" TargetType="{x:Type Image}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition></RowDefinition>
                    <RowDefinition></RowDefinition>
                </Grid.RowDefinitions>

                <HERE I WANT IMAGE SOURCE  Grid.Row="0"/>
                <Popup  IsOpen="False" 
                            Name="OponentImagePopUp"                               
                            AllowsTransparency="True"
                            PopupAnimation="Slide"
                            HorizontalOffset="-35"
                            VerticalOffset="0"
                            Grid.Row="1">
                    <Border BorderThickness="1" 
                                BorderBrush="Black">
                        <Grid  Height="350" MinWidth="350">
                            <Grid.Background>
                                <LinearGradientBrush StartPoint="0,0" EndPoint="0,0.3">
                                    <LinearGradientBrush.GradientStops>
                                        <GradientStop Color="LightGray" Offset="0"/>
                                        <GradientStop Color="WhiteSmoke" Offset="1"/>
                                    </LinearGradientBrush.GradientStops>
                                </LinearGradientBrush>
                            </Grid.Background>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="75"></ColumnDefinition>
                                <ColumnDefinition Width="*"></ColumnDefinition>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*"></RowDefinition>
                            </Grid.RowDefinitions>

                            <Border BorderThickness="1" 
                                    BorderBrush="Black"
                                    Background="White"
                                    Margin="4,4,4,4"
                                    Grid.Column="0">
                                <Image Margin="2,2,2,2">
                                    <Image.Source >
                                        <MultiBinding Converter="{StaticResource avatarConverter}">
                                            <Binding Path="ProfilePhoto"></Binding>
                                            <Binding Path="StatusInfo.IsLogged"></Binding>
                                        </MultiBinding>
                                    </Image.Source>
                                </Image>
                            </Border>
                        </Grid>
                    </Border>
                </Popup>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter TargetName="OponentImagePopUp" Property="IsOpen" Value="True" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

我有两个问题:

我不知道如何访问控制模板中的图像源

此外，如果我尝试在图像控件上创建样式并设置属性模板 -> 图像控件没有属性模板。

我的目标是显示具有相同图像的弹出窗口，只是更大。

编辑:

我创建了简单的控制，作为 Glazkov 先生的建议，它具有图像控制，这里是:

<UserControl x:Class="Spirit.Controls.AvatarImageControl"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <Image x:Name="SmallImage"
            Source="{Binding ElementName=root, Path=ImageSource}"
            Stretch="Fill"/>
    </Grid>
</UserControl>

后面的代码是一样的:

  public partial class AvatarImageControl : UserControl
    {
        public AvatarImageControl()
        {
            InitializeComponent();
        }

        public ImageSource ImageSource
        {
            get { return (ImageSource)GetValue(ImageSourceProperty); }
            set { SetValue(ImageSourceProperty, value); }
        }

        public static readonly DependencyProperty ImageSourceProperty =
            DependencyProperty.Register("ImageSource", typeof(ImageSource), typeof(AvatarImageControl), new UIPropertyMetadata(null));

    }

我尝试在 View 中使用此控件:

<Grid Background="#99CCFF"  Margin="4,4,4,4">
      <Controls:AvatarImageControl ImageSource="{Binding Path=Oponent.Info.ProfilePhoto,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}"/>
</Grid>

我将 Uri 的属性类型绑定(bind)到 AvatarImageControl 的 ImageSource。

我做什么坏事？

我也在用户控制中尝试这个:

<Grid>
    <Image x:Name="SmallImage"
        Source="{Binding Path=ImageSource, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
        Stretch="Fill"/>
</Grid>

结果是一样的。

我在 View 中使用用户控件，我从 Uri 的 View 模型类型绑定(bind) ImageSource 属性。没有其他的。

编辑 2:
Glazkov 先生的代码产生异常:

{"Set property 'System.Windows.Controls.Primitives.Popup.IsOpen' threw an exception."}
{"A TwoWay or OneWayToSource binding cannot work on the read-only property 'IsMouseOver' of type 'System.Windows.Controls.Image'."}
StackTrace:
   at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
   at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
   at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
   at Spirit.Controls.AvatarImageControl.InitializeComponent() in c:\Users\Jan\Documents\Visual Studio 2010\Projects\BACKUP\Pokec__Messenger\Spirit_Caliburn_Micro_v1.0\Controls\AvatarImageControl.xaml:line 1
   at Spirit.Controls.AvatarImageControl..ctor() in C:\Users\Jan\Documents\Visual Studio 2010\Projects\BACKUP\Pokec__Messenger\Spirit_Caliburn_Micro_v1.0\Controls\AvatarImageControl.xaml.cs:line 24

解决方案是:

 <Popup IsOpen="{Binding ElementName=SmallImage, Path=IsMouseOver, Mode=OneWay}">

设置单向绑定(bind)模式。

它运作良好。

感谢 Glazkov 先生的帮助。

Answer 1

您不能为图像控件定义控件模板，因为它不是从 Control 派生的。 ，因此它没有控制模板。它只是在 OnRender 方法中呈现自己。

您可以做的是创建一个具有一个依赖属性 ImageSource 的用户控件。 .这是此控件的 XAML:

<UserControl x:Class="AvatarImage"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Name="root">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>

        <Image x:Name="SmallImage"
               Source="{Binding ElementName=root, Path=ImageSource}"
               Grid.Row="0" />
        <Popup IsOpen="{Binding ElementName=SmallImage, Path=IsMouseOver, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
               Name="OponentImagePopUp"
               AllowsTransparency="True"
               PopupAnimation="Slide"
               HorizontalOffset="-35"
               VerticalOffset="0"
               Grid.Row="1">
            <Border BorderThickness="1"
                    BorderBrush="Black">
                <Grid Height="350"
                      MinWidth="350">
                    <Grid.Background>
                        <LinearGradientBrush StartPoint="0,0"
                                             EndPoint="0,0.3">
                            <LinearGradientBrush.GradientStops>
                                <GradientStop Color="LightGray"
                                              Offset="0" />
                                <GradientStop Color="WhiteSmoke"
                                              Offset="1" />
                            </LinearGradientBrush.GradientStops>
                        </LinearGradientBrush>
                    </Grid.Background>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="75"></ColumnDefinition>
                        <ColumnDefinition Width="*"></ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"></RowDefinition>
                    </Grid.RowDefinitions>

                    <Border BorderThickness="1"
                            BorderBrush="Black"
                            Background="White"
                            Margin="4,4,4,4"
                            Grid.Column="0">
                        <Image Margin="2,2,2,2">
                            <Image.Source>
                                <MultiBinding Converter="{StaticResource avatarConverter}">
                                    <Binding Path="ProfilePhoto"></Binding>
                                    <Binding Path="StatusInfo.IsLogged"></Binding>
                                </MultiBinding>
                            </Image.Source>
                        </Image>
                    </Border>
                </Grid>
            </Border>
        </Popup>
    </Grid>
</UserControl>

这是背后的代码(AvatarImage.xaml.cs):

public partial class AvatarImage : UserControl
{
    public AvatarImage() {
        InitializeComponent();
    }

    public ImageSource ImageSource {
        get { return (ImageSource)GetValue(ImageSourceProperty); }
        set { SetValue(ImageSourceProperty, value); }
    }

    public static readonly DependencyProperty ImageSourceProperty =
        DependencyProperty.Register("ImageSource", typeof(ImageSource), typeof(AvatarImage), new UIPropertyMetadata(null));
}