wpf 在 Windows 8 Metro 应用程序中拖放图像
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Drag and drop image in Windows 8 Metro App
提问by Ruwan Dissanayaka
Is there a way to drag and drop an image in a Windows 8 metro app. I'm using C# and XAML. Following is what I need...
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...
回答by John Koerner
Sure there is. You'll have to control it yourself, but it is pretty easy. You need to use a few pointer events like this:
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:
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>
Then in your CS file:
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);
}
}
回答by joaquim.adraz
I've found a good solution here: http://xatazch.blogspot.pt/2012/08/drag-and-drop-item-using.html
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
Using TranslateTransform we can get a smooth and "real time" movement for the draggable item.
使用 TranslateTransform，我们可以获得可拖动项的平滑和“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;
}
Hope it helps!
希望能帮助到你！
回答by Starceaker
I tried your solution but it didn't really result in "perfect" moving of the image.
我尝试了你的解决方案，但它并没有真正导致图像的“完美”移动。
Alternatively you can try to use the Manipulation events:
或者，您可以尝试使用操作事件：
XAML:
XAML：
<Image x:Name="imgSanta" Width="250" Source="Assets/santa.png" ManipulationMode="All" ManipulationStarted="imgSanta_ManipulationStarted_1" ManipulationDelta="imgSanta_ManipulationDelta_1"></Image>
C#
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);
}
Even with this I'm not 100% satisfied but I do think it has a better result. Let me know what you think about this. (Even though this is an older post, it's worth mentioning)
即使这样，我也不是 100% 满意，但我确实认为它有更好的结果。让我知道您对此有何看法。（尽管这是一个较旧的帖子，但值得一提）
EDIT: I noticed the 1:1 movement only worked when my image was located within a StackPanel.
编辑：我注意到 1:1 运动仅在我的图像位于 StackPanel 内时才有效。
回答by Nils
joaquims approach is the faster one... have look at this demo app: http://code.msdn.microsoft.com/windowsapps/Drag-and-Drop-a-picture-in-26580dc0
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
