public void Receive(DependencyObject value)
{
var control = (UIElement) value;
control.AllowDrop = true;
var window = Window.GetWindow(value);
DragAdorner adorner=null;
var createAdorner = Observable.FromEventPattern<DragEventHandler, DragEventArgs>
(h => control.PreviewDragEnter += h, h => control.PreviewDragEnter -= h)
.Select(ev => ev.EventArgs)
.Subscribe(e =>
{
var files = (string[])e.Data.GetData(DataFormats.FileDrop);
var container = new FileDropContainer(files);
var contentPresenter = new ContentPresenter {Content = container};
adorner = new DragAdorner(control, contentPresenter);
});
var clearAdorner = Observable.FromEventPattern<DragEventHandler, DragEventArgs>(h => control.PreviewDragLeave += h, h => control.PreviewDragLeave -= h).ToUnit()
.Merge(Observable.FromEventPattern<DragEventHandler, DragEventArgs>(h => control.PreviewDrop += h, h => control.PreviewDrop -= h).ToUnit())
.Subscribe(e =>
{
if (adorner == null) return;
adorner.Detatch();
adorner = null;
});
var updatePositionOfAdornment = Observable.FromEventPattern<DragEventHandler, DragEventArgs>
(h => control.PreviewDragOver += h, h => control.PreviewDragOver -= h)
.Select(ev => ev.EventArgs)
.Where(_=>adorner!=null)
.Subscribe(e => adorner.MousePosition = e.GetPosition(window));
var dropped = Observable.FromEventPattern<DragEventHandler, DragEventArgs>
(h => control.Drop += h, h => control.Drop -= h)
.Select(ev => ev.EventArgs)
.SelectMany(e =>
{
if (!e.Data.GetDataPresent(DataFormats.FileDrop))
return Enumerable.Empty<FileInfo>();
// Note that you can have more than one file.
var files = (string[]) e.Data.GetData(DataFormats.FileDrop);
return files.Select(f => new FileInfo(f));
})
.SubscribeSafe(_fileDropped);
_cleanUp.Disposable = Disposable.Create(() =>
{
updatePositionOfAdornment.Dispose();
clearAdorner.Dispose();
createAdorner.Dispose();
dropped.Dispose();
_fileDropped.OnCompleted();
});
}
public void FileDropContainerShouldReturnFileNames()
{
var input = new[] { @"c:\temp\file1.txt", @"c:\temp\file2.txt" };
var expectedResult = new[] { @"file1.txt", @"file2.txt" };
var container = new FileDropContainer(input);
container.Files.Should().BeEquivalentTo(expectedResult);
}
public void FileDropContainerShouldHandleEmpty()
{
var input = new string[0];
var container = new FileDropContainer(input);
container.Files.Should().BeEmpty();
}
public void Receive(DependencyObject value)
{
if (_isLoaded || null == value)
{
return;
}
_isLoaded = true;
var control = value as UIElement;
if (null == control)
{
return;
}
control.AllowDrop = true;
var window = Window.GetWindow(value);
DragAdorner adorner = null;
var createAdorner = Observable.FromEventPattern <DragEventHandler, DragEventArgs>
(h => control.PreviewDragEnter += h, h => control.PreviewDragEnter -= h)
.Select(ev => ev.EventArgs)
.Subscribe(e =>
{
var files = (string[])e.Data.GetData(DataFormats.FileDrop);
var container = new FileDropContainer(files);
var contentPresenter = new ContentPresenter {
Content = container
};
adorner = new DragAdorner(control, contentPresenter);
});
var clearAdorner = Observable.FromEventPattern <DragEventHandler, DragEventArgs>(h => control.PreviewDragLeave += h, h => control.PreviewDragLeave -= h).ToUnit()
.Merge(Observable.FromEventPattern <DragEventHandler, DragEventArgs>(h => control.PreviewDrop += h, h => control.PreviewDrop -= h).ToUnit())
.Subscribe(e =>
{
if (adorner == null)
{
return;
}
adorner.Detatch();
adorner = null;
});
var updatePositionOfAdornment = Observable.FromEventPattern <DragEventHandler, DragEventArgs>
(h => control.PreviewDragOver += h, h => control.PreviewDragOver -= h)
.Select(ev => ev.EventArgs)
.Where(_ => adorner != null)
.Subscribe(e => adorner.MousePosition = e.GetPosition(window));
var dropped = Observable.FromEventPattern <DragEventHandler, DragEventArgs>
(h => control.Drop += h, h => control.Drop -= h)
.Select(ev => ev.EventArgs)
.SelectMany(e =>
{
if (!e.Data.GetDataPresent(DataFormats.FileDrop))
{
return(Enumerable.Empty <FileInfo>());
}
// Note that you can have more than one file.
var files = (string[])e.Data.GetData(DataFormats.FileDrop);
return(files.Select(f => new FileInfo(f)));
})
.SubscribeSafe(_fileDropped);
_cleanUp.Disposable = Disposable.Create(() =>
{
updatePositionOfAdornment.Dispose();
clearAdorner.Dispose();
createAdorner.Dispose();
dropped.Dispose();
_fileDropped.OnCompleted();
});
}
public void FileDropContainerShouldHandleNull()
{
var container = new FileDropContainer(null);
container.Files.Should().BeEmpty();
}
