[英]Drag and drop image in Windows 8 Metro App
有沒有辦法在Windows 8 metro應用程序中拖放圖像。 我正在使用C#和XAML。 以下是我需要的......
當然有。 你必須自己控制它,但它很容易。 你需要使用這樣的一些指針事件:
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>
然后在你的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);
}
}
我在這里找到了一個很好的解決方案: http : //xatazch.blogspot.pt/2012/08/drag-and-drop-item-using.html
使用TranslateTransform,我們可以為可拖動項目獲得平滑且“實時”的移動。
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;
}
希望能幫助到你!
我試過你的解決方案,但它並沒有真正導致圖像的“完美”移動。
或者,您可以嘗試使用操縱事件:
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);
}
即便如此,我並不是100%滿意,但我認為它有更好的結果。 讓我知道你對此的看法。 (即使這是一篇較老的帖子,值得一提)
編輯:我注意到1:1運動僅在我的圖像位於StackPanel內時才起作用。
joaquims方法是更快的...看看這個演示應用程序: http ://code.msdn.microsoft.com/windowsapps/Drag-and-Drop-a-picture-in-26580dc0
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