如何通过程序动态更改工具包图钉的内容?
我在初始化的地图上放了几个图钉,我想在用户点击图钉时更改图钉的内容。
这是我的 xaml 代码:
<toolkit:MapExtensions.Children>
<toolkit:MapItemsControl x:Name="MapItems">
<toolkit:MapItemsControl.ItemTemplate>
<DataTemplate>
<toolkit:Pushpin GeoCoordinate="{Binding Coordinate}" Tap="PinOnTap">
<toolkit:Pushpin.Template>
<ControlTemplate TargetType="toolkit:Pushpin">
<StackPanel>
<ContentPresenter x:Name="content" HorizontalAlignment="Center" Content="{TemplateBinding Content}" />
<Path Data="M0,0 L0,1 L1,0" Fill="{TemplateBinding Background}" Stretch="Fill" Margin="32,0" Height="12" Width="18"
Visibility="{Binding Content.Visibility, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
HorizontalAlignment="Left" />
<Image Source="{Binding Icon_img}" Stretch="None" HorizontalAlignment="Left"/>
</StackPanel>
</ControlTemplate>
</toolkit:Pushpin.Template>
<Border Background="White" Visibility="Collapsed" Width="200" HorizontalAlignment="Center" >
<StackPanel Orientation="Horizontal" Tap="gotoProfileFromPin">
<Image Margin="8" Source="{Binding Image}" VerticalAlignment="Top" Width="50" Height="50" />
<StackPanel>
<TextBlock Text="{Binding Uid}" Visibility="Collapsed"/>
</StackPanel>
</StackPanel>
</Border>
</toolkit:Pushpin>
</DataTemplate>
</toolkit:MapItemsControl.ItemTemplate>
</toolkit:MapItemsControl>
</toolkit:MapExtensions.Children>
还有我的program.cs:
private void PinOnTap(object sender, System.Windows.Input.GestureEventArgs e)
{
var popOut = ((sender as Pushpin).Content) as Border;
popOut.Visibility = System.Windows.Visibility.Visible;
var popOutImg = (popOutNew.Child as StackPanel).DataContext;
var popUser = popOutImg as UserPin;
// function to get the images by Uid
popUser.Image = new Uri(images fetch from function, UriKind.RelativeOrAbsolute);
popOutNew.Child.UpdateLayout();
e.Handled = true;
}
在 PinOnTap 函数中,我将从另一个函数中获取图片并在地图上显示为 toolkit:Pushpin.Content,但是它无法工作。
这段代码:
popUser.Image = new Uri(images fetch from function, UriKind.RelativeOrAbsolute);
它只会更改图像源,但不会更新 UI。我打印它的价值并且它的来源已经改变,但我不知道为什么它没有出现在地图上(地图只显示白色背景的“边界”并且里面没有任何图像)