Question

我刚刚开始使用Silverlight，我决定在Visual Studio 2010中做一个小应用程序。我试图在Canvas中找到usercontrol的当前位置。这是XAML布局：

<Grid x:Name="LayoutRoot" Background="#FF141313">
    <Grid.RowDefinitions>
        <RowDefinition Height="39"/>
        <RowDefinition/>
    </Grid.RowDefinitions>
    <Button Opacity="0.5" Background="{x:Null}" BorderThickness="1" FontFamily="Courier New" Content="Align Images" Cursor="Hand" Name="buttonAlignImages" Click="buttonAlignImages_Click" Margin="45,8,0,11" HorizontalAlignment="Left" Width="84" />
    <Button HorizontalAlignment="Left" Width="33" Opacity="0.5" Background="{x:Null}" BorderThickness="1" FontFamily="Courier New" Content="Home" Cursor="Hand" Margin="8,8,0,11"/>
    <Canvas x:Name="ImageContainer" Margin="8" Grid.Row="1" Background="Black"/>
</Grid>

我的usercontrol被添加到“ImageContainer”Canvas中。 XAML中的一个按钮称为“buttonAlignImages”。当用户点击它时，我基本上希望图像以特定方式对齐。无论如何，我想首先获得嵌入在“ImageContainer”中的usercontrol的位置。所以这是单击按钮时的代码：

private void buttonAlignImages_Click(object sender, RoutedEventArgs e)
    {
        double margin = 5.0;
        Point top_left = new Point(margin, margin);
        Point top_right = new Point(ActualWidth - margin, margin);
        Point bottom_left = new Point(5.0, ActualHeight - margin);
        Point bottom_right = new Point(ActualWidth - margin, ActualHeight - margin);

        foreach (UIElement element in ImageContainer.Children)
        {

            Photo singlePhoto = element as Photo;
            if (singlePhoto != null)
            {
                // get the transform for the current photo as applicable to basically this visual
                GeneralTransform gt = singlePhoto.TransformToVisual(ImageContainer);
                // get the position on the root visual by applying the transform to the singlePhoto
                Point singlePhotoTopLeft = gt.Transform(new Point(0, 0));
                // now translate the position of the singlePhoto
                singlePhoto.Translate(singlePhotoTopLeft.X - top_left.X, singlePhotoTopLeft.Y - top_left.Y);
            }
        }
    }
public void Translate(double deltaX, double deltaY)
    {
        translateTransform.X += deltaX;
        translateTransform.Y += deltaY;
    }

嵌入式照片用户控件确实移动但是当我调用gt.Transform（新的Point（0,0））时它总是给我（0,0），因此得到的转换只有5个像素。为什么会这样？我没有正确使用TransformToVisual（）吗？

Answer 1

已经有一段时间了，但如果没有答案你就无法继续生活:)你会尝试

Point singlePhotoTopLeft = gt.Transform(new Point());

相反？

Silverlight 4 - 我正确使用TransformToVisual（）吗？

1 个答案: