当鼠标悬停在图像控件上时,我希望显示弹出窗口。因此,我创建了一个控件模板,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:
- 我不知道如何在控件模板中访问图像源。
- 如果我尝试在图像控件上创建样式并设置属性模板 -> 图像控件没有模板属性。
我的目的是显示一个弹出窗口,其中包含相同的图像,只是更大。
编辑:
根据Glazkov先生的建议,我创建了一个简单的控件,其中包含图像控件,这是它:
<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>
代码后台是相同的:
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));
}
我尝试在视图中使用此控件:
<Grid Background="#99CCFF" Margin="4,4,4,4">
<Controls:AvatarImageControl ImageSource="{Binding Path=Oponent.Info.ProfilePhoto,Mode=OneWay,UpdateSourceTrigger=PropertyChanged}"/>
</Grid>
我将Uri的属性类型绑定到AvatarImageControl的ImageSource。
我的做法有什么问题吗?
此外,我在用户控件中尝试了这个:
<Grid>
<Image x:Name="SmallImage"
Source="{Binding Path=ImageSource, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"
Stretch="Fill"/>
</Grid>
结果是相同的。
我在视图中使用用户控件,将来自视图模型类型为Uri的ImageSource属性绑定到它。没有别的。
编辑2: Glazkov先生的代码会产生异常:
{"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}">
将单向绑定模式设置为 on。
它运行良好。
感谢 Glazkov 先生的帮助。