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。
最佳答案
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));
}
关于wpf - 鼠标悬停在图像控件上时显示弹出窗口，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4735395/