c# - 在 Windows 8 Metro App 中拖放图像

Question

有没有办法在 Windows 8 Metro 应用程序中拖放图像。我正在使用 C# 和 XAML。以下是我需要的...

Answer 1

我在这里找到了一个很好的解决方案：http: //xatazch.blogspot.pt/2012/08/drag-and-drop-item-using.html

使用 TranslateTransform，我们可以获得可拖动项目的平滑和“实时”移动。

void MainPage_Loaded(object sender, RoutedEventArgs e)
{
     image1.ManipulationDelta += DragableItem_ManipulationDelta;
     image1.RenderTransform = new TranslateTransform();
}

private void DragableItem_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
     Image dragableItem = sender as Image;
     TranslateTransform translateTransform = dragableItem.RenderTransform as TranslateTransform;

     translateTransform.X += e.Delta.Translation.X;
     translateTransform.Y += e.Delta.Translation.Y;
}

希望能帮助到你！

Answer 2

当然有。你必须自己控制它，但这很容易。您需要使用一些像这样的指针事件：

XAML：

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"   PointerMoved="GridPointerMoved">
    <Image x:Name="image1" HorizontalAlignment="Left" Height="100" VerticalAlignment="Top" Width="100" Source="Assets/imageFile.png"  PointerPressed="ImagePointerPressed" PointerReleased="ImagePointerReleased"/>
</Grid>

然后在您的 CS 文件中：

Point positionWithinImage;
private void ImagePointerPressed(object sender, PointerRoutedEventArgs e)
{
    Debug.WriteLine("Pressed");
    holding = true;

    positionWithinImage = e.GetCurrentPoint(sender as Image).Position;
}

private void ImagePointerReleased(object sender, PointerRoutedEventArgs e)
{
    Debug.WriteLine("Released");
    holding = false;
}

bool holding = false;

private void GridPointerMoved(object sender, PointerRoutedEventArgs e)
{
    if (holding)
    {
        var pos = e.GetCurrentPoint(image1.Parent as Grid).Position;
        image1.Margin = new Thickness(pos.X - this.positionWithinImage.X, pos.Y - this.positionWithinImage.Y, 0, 0);
    }
}

Answer 3

我尝试了您的解决方案，但并没有真正导致图像的“完美”移动。

或者，您可以尝试使用操作事件：

XAML：

<Image x:Name="imgSanta" Width="250" Source="Assets/santa.png" ManipulationMode="All" ManipulationStarted="imgSanta_ManipulationStarted_1" ManipulationDelta="imgSanta_ManipulationDelta_1"></Image>

C＃

private void imgSanta_ManipulationStarted_1(object sender, ManipulationStartedRoutedEventArgs e)
        {
            txtFeedback.Text = "Manipulation started";
        }

        private void imgSanta_ManipulationDelta_1(object sender, ManipulationDeltaRoutedEventArgs e)
        {                
            var newTop = imgSanta.Margin.Top + e.Delta.Translation.Y;
            var newLeft = imgSanta.Margin.Left + e.Delta.Translation.X;
            imgSanta.Margin = new Thickness(newLeft, newTop, 0, 0);
        } 

即使这样，我也不是 100% 满意，但我确实认为它有更好的结果。让我知道你对此有何看法。（虽然这是一篇较旧的帖子，但值得一提）

编辑：我注意到只有当我的图像位于 StackPanel 中时，1:1 运动才有效。

Answer 4

joaquims 方法是更快的方法......看看这个演示应用程序：http ://code.msdn.microsoft.com/windowsapps/Drag-and-Drop-a-picture-in-26580dc0