/// <summary>
/// Handles the DragSource_MouseLeftButtonUp of the drag source. Completes the dragging operation and perform the drop if applies.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The envet args instance containing event data.</param>
private void DragSource_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
this.dragSource.ReleaseMouseCapture();
if (this.IsDragging)
{
IList <FrameworkElement> dropZones = this.CheckDropZones(e);
foreach (FrameworkElement dropZone in dropZones)
{
ICommand command = DragDropManager.GetDropCommand(dropZone);
if (command != null)
{
DropPayload dropPayload = new DropPayload
{
DraggedItem = DragDropManager.GetDragData(this.dragSource),
RelativePosition = e.GetPosition(dropZone),
MouseEventArgs = e,
DropData = DragDropManager.GetDropData(dropZone),
};
command.Execute(dropPayload);
}
}
}
this.DragPopupChild.Children.Clear();
this.DragPopup.IsOpen = false;
this.IsDragging = false;
}
private void HandleDrop(DropPayload dropPayload)
{
Asset draggedAsset = dropPayload.DraggedItem as Asset;
if (draggedAsset != null)
{
this.Asset = draggedAsset;
}
}
/// <summary>
/// Drops an asset to a folder.
/// </summary>
/// <param name="dropPayload">The drop payload that contains the drop information.</param>
private void DropAssetOnFolder(DropPayload dropPayload)
{
FolderAsset folderAsset = dropPayload.DropData as FolderAsset;
Asset asset = dropPayload.DraggedItem as Asset;
if (folderAsset != null)
{
this.AddAssetToFolder(asset, folderAsset.Id);
this.RefreshCurrentAssets();
}
}
/// <summary>
/// Handles the MouseMove of the drag source. Shows a visual notification if the asset can be dropped or not..
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The envet args instance containing event data.</param>
private void DragSource_MouseMove(object sender, MouseEventArgs e)
{
if (this.IsDragging)
{
if (this.DragPopup != null && this.DragPopupChild != null && this.DragPopupChild.Children.Count > 0 &&
this.DragPopupChild.ActualHeight > 0 && this.DragPopupChild.ActualWidth > 0)
{
this.DragPopupChild.Opacity = 1;
Point point = e.GetPosition(Application.Current.RootVisual);
const double HeightOffset = 15;
double currentVerticalPosition = point.Y - this.DragPopupChild.ActualHeight + HeightOffset;
double currentHorizontalPosition = point.X - (this.DragPopupChild.ActualWidth / 2);
this.DragPopup.VerticalOffset = currentVerticalPosition;
this.DragPopup.HorizontalOffset = currentHorizontalPosition;
FrameworkElement dropZone = this.GetDropZone(e);
if (dropZone != null)
{
bool result = true;
if (dropZone != null)
{
ICommand command = DragDropManager.GetDropCommand(dropZone);
if (command != null)
{
DropPayload dropPayload = new DropPayload
{
DraggedItem = DragDropManager.GetDragData(this.dragSource),
RelativePosition = e.GetPosition(dropZone),
MouseEventArgs = e,
DropData = DragDropManager.GetDropData(dropZone),
CustomData = DragDropManager.GetCustomData(this.dragSource)
};
result = command.CanExecute(dropPayload);
}
this.ShowDragDrop(result);
}
}
else
{
this.ShowDragDrop(false);
}
}
}
}
public void ShouldUpdateHasAssetWhenExecutingDropCommand()
{
var viewModel = this.CreateViewModel();
DropPayload dropPayload = new DropPayload();
VideoAsset asset = new VideoAsset();
dropPayload.DraggedItem = asset;
Assert.IsFalse(viewModel.HasAsset);
viewModel.DropCommand.Execute(dropPayload);
Assert.IsTrue(viewModel.HasAsset);
}
public void ShouldUpdateCurrentAssetWhenExecutingDropCommand()
{
var viewModel = this.CreateViewModel();
DropPayload dropPayload = new DropPayload();
VideoAsset asset = new VideoAsset();
dropPayload.DraggedItem = asset;
Assert.IsNull(viewModel.Asset);
viewModel.DropCommand.Execute(dropPayload);
Assert.IsNotNull(viewModel.Asset);
Assert.AreSame(asset, viewModel.Asset);
}
/// <summary>
/// Drops an asset to a folder.
/// </summary>
/// <param name="dropPayload">The drop payload that contains the drop information.</param>
private void DropAssetOnFolder(DropPayload dropPayload)
{
FolderAsset folderAsset = dropPayload.DropData as FolderAsset;
Asset asset = dropPayload.DraggedItem as Asset;
if (folderAsset != null)
{
this.AddAssetToFolder(asset, folderAsset.Id);
this.RefreshCurrentAssets();
}
else if (this.currentFolderAsset != null)
{
this.AddAssetToFolder(asset, this.currentFolderAsset.Id);
this.RefreshCurrentAssets();
}
else
{
if (asset != null && !this.Assets.Contains(asset))
{
this.AddAsset(asset);
}
}
}
private bool CanHandleDrop(DropPayload dropPayload)
{
return(this.IsDisplayed && (dropPayload.DraggedItem != this.VideoAssetInOut));
}
