我RadTileView
在我的项目中使用,默认情况下,Tile
当它们处于恢复状态时启用拖放
,
但是当 1 个磁贴处于最大化状态而所有其他磁贴处于最小化状态时,我无法实现相同的功能
,
我认为 Telerik 并没有在他们的RadTileView
控制下提供这个功能。实现这一目标的最佳方法是什么,或者是否可能?
我RadTileView
在我的项目中使用,默认情况下,Tile
当它们处于恢复状态时启用拖放
,
但是当 1 个磁贴处于最大化状态而所有其他磁贴处于最小化状态时,我无法实现相同的功能
,
我认为 Telerik 并没有在他们的RadTileView
控制下提供这个功能。实现这一目标的最佳方法是什么,或者是否可能?
在搜索了不同的博客后,我了解到 Telerik Tile 开箱即用的视图中不提供此功能,但他们已将其添加到他们的愿望清单中,您可以在这里投票支持此功能http://www.telerik。 com/support/pits.aspx#/public/silverlight/2449
然而,作为一项工作,我已经为 RadTileView 实现了一个我自己的行为,它将完成所需的任务。
public class RadTilesDragDropBehavior : Behavior<RadTileView>
{
private RadTileViewItem draggingTile { get; set; }
public TileViewDragDropBehavior()
{
// Insert code required on object creation below this point.
}
protected override void OnAttached()
{
base.OnAttached();
// Insert code that you would want run when the Behavior is attached to an object.
DragDropManager.AddDragInitializeHandler(AssociatedObject, OnDragInitialize);
DragDropManager.AddDragDropCompletedHandler(AssociatedObject, OnDragAndDropCompleted);
AssociatedObject.PreviewDragOver += MyTileView_PreviewDragOver;
}
private void OnDragInitialize(object sender, DragInitializeEventArgs args)
{
var tileView = sender as RadTileView;
var tileViewItem = args.OriginalSource as RadTileViewItem;
Point pt = Util.CorrectGetPosition((RadTileView)sender);
HitTestResult result = VisualTreeHelper.HitTest(AssociatedObject, pt);
if (result != null)
{
DependencyObject obj = result.VisualHit.ParentOfType<RadFluidContentControl>();
if (obj != null)
{
//trying to drag from Tile content area, not allowed.
return;
}
}
if (tileViewItem != null && tileView != null && tileView.MaximizedItem != null)
{
args.Data = tileViewItem;
var draggingImage = new Image
{
Source = new Telerik.Windows.Media.Imaging.RadBitmap(tileViewItem).Bitmap,
Width = tileViewItem.RestoredWidth,
Height = tileViewItem.RestoredHeight
};
if (tileView.MaximizedItem == tileViewItem)
{
args.DragVisualOffset = new Point(args.RelativeStartPoint.X - 50, args.RelativeStartPoint.Y-55);
}
args.DragVisual = draggingImage;
tileViewItem.Opacity = 0;
args.AllowedEffects = DragDropEffects.Move;
args.Handled = true;
// keep a copy of dragging tile
draggingTile = tileViewItem;
}
}
private void OnDragAndDropCompleted(object sender, DragDropCompletedEventArgs args)
{
if (args.OriginalSource.GetType() == typeof(RadTileViewItem))
{
if (AssociatedObject.MaximizedItem != null)
{
Point pt = Util.CorrectGetPosition((RadTileView)sender);
HitTestResult result = VisualTreeHelper.HitTest(AssociatedObject, pt);
if (result != null)
{
DependencyObject obj = result.VisualHit.ParentOfType<RadTileViewItem>();
if (obj != null)
{
((RadTileViewItem)obj).Position = draggingTile.Position;
draggingTile.Opacity = 100;
}
else
{
draggingTile.Opacity = 100;
}
}
else
{
draggingTile.Opacity = 100;
}
}
}
}
private void MyTileView_PreviewDragOver(object sender, System.Windows.DragEventArgs e)
{
FrameworkElement container = sender as FrameworkElement;
if (AssociatedObject.MaximizedItem != null)
{
if (container == null)
{
return;
}
double tolerance = 60;
double verticalPos = Util.CorrectGetPosition((RadTileView)container).Y;
double offset = 20;
ScrollViewer scrollViewer = AssociatedObject.FindChildByType<ScrollViewer>();
if (verticalPos < tolerance) // Top of visible list?
{
scrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset - offset); //Scroll up.
}
else if (verticalPos > container.ActualHeight - tolerance) //Bottom of visible list?
{
scrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset + offset); //Scroll down.
}
}
}
protected override void OnDetaching()
{
base.OnDetaching();
// Insert code that you would want run when the Behavior is removed from an object.
DragDropManager.RemoveDragInitializeHandler(AssociatedObject, OnDragInitialize);
DragDropManager.RemoveDragDropCompletedHandler(AssociatedObject, OnDragAndDropCompleted);
AssociatedObject.PreviewDragOver -= MyTileView_PreviewDragOver;
}
}
public static class Util
{
public static Point CorrectGetPosition(Visual relativeTo)
{
Win32Point w32Mouse = new Win32Point();
GetCursorPos(ref w32Mouse);
return relativeTo.PointFromScreen(new Point(w32Mouse.X, w32Mouse.Y));
}
[StructLayout(LayoutKind.Sequential)]
internal struct Win32Point
{
public Int32 X;
public Int32 Y;
};
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool GetCursorPos(ref Win32Point pt);
};
XAML 会是这样的
<telerik:RadTileView x:Name="MyTileView" ItemsSource={Binding TileItems}>
<i:Interaction.Behaviors>
<behaviors:RadTilesDragDropBehavior/>
</i:Interaction.Behaviors>
</telerik:RadTileView>