public void WillAnimateCancel(UIDragInteraction interaction, UIDragItem item, IUIDragAnimating animator)
{
animator.AddAnimations(() =>
{
FadeItems(new UIDragItem[] { item }, 1f);
});
}
/// <summary>
/// Required for drag operations from a table
/// </summary>
public UIDragItem[] GetItemsForBeginningDragSession(UITableView tableView, IUIDragSession session, NSIndexPath indexPath)
{
var todo = todoItems[indexPath.Row];
var stringToDrop = todo.Name;
if (todo.Done)
{ // we can modify the data that is dragged
stringToDrop += " [" + NSBundle.MainBundle.LocalizedString("Done", "") + "]";
}
var data = NSData.FromString(stringToDrop, NSStringEncoding.UTF8);
var itemProvider = new NSItemProvider();
itemProvider.RegisterDataRepresentation(UTType.PlainText,
NSItemProviderRepresentationVisibility.All,
(completion) =>
{
completion(data, null);
return(null);
});
var dragItem = new UIDragItem(itemProvider);
//dragItem.LocalObject = if your object is a subclass of NSObject
return(new UIDragItem[] { dragItem });
}
public void OnEndDrag(PointerEventData eventData)
{
if (mTarget == null)
{
return;
}
GameObject go = eventData.pointerEnter; //鼠标下的物体
if (go == null)
{
return;
}
UIDragReceiver dr = go.GetComponentInParent <UIDragReceiver> ();//向上取解决UIDragReceiver被拦截的问题
if (dr == null || dr.enabled == false || (dr.recvMask & mTarget.typeMask) == 0 || object.ReferenceEquals(mTarget.GetComponentInParent <UIDragReceiver> (), dr))
{
if (mFallback)
{
StartCoroutine(Fallback(mTarget.transform, mLocalBeginlPos));
}
}
else
{
if (onDragReceived != null)
{
onDragReceived(mTarget, dr);
}
recoverDepth(mTarget.transform);
}
mTarget = null;
}
public UIDragItem[] GetItemsForBeginningDragSession(UITableView tableView, IUIDragSession session, NSIndexPath indexPath)
{
_sourceTableView = tableView;
_sourceListView = Element;
_dragItem = (Item)((IList)Element.ItemsSource)[indexPath.Row];
// https://forums.xamarin.com/discussion/66953/how-to-save-c-object-into-nsdata-and-get-the-same-object-from-nsdata
//var data = NSKeyedArchiver.ArchivedDataWithRootObject(indexPath);
//var data = NSData.FromString(placeName, NSStringEncoding.UTF8);
var data = NSData.FromString(_dragItem.Id);
var itemProvider = new NSItemProvider();
itemProvider.RegisterDataRepresentation(UTType.PlainText, NSItemProviderRepresentationVisibility.All,
(completion) =>
{
completion(data, null);
return(null);
});
var uidragItem = new UIDragItem(itemProvider);
return(new[] { uidragItem });
}
public void OnBeginDrag(PointerEventData eventData)
{
GameObject go = eventData.pointerEnter;
if (go == null)
{
return;
}
UIDragItem di = go.GetComponent <UIDragItem> ();
if (di == null || di.enabled == false)
{
return;
}
mLocalBeginlPos = di.transform.localPosition;
mTarget = mClone ? GameObject.Instantiate <UIDragItem> (di) : di;
if (mClone)
{
mTarget.transform.SetParent(di.transform.parent, false);
}
mTargetParent = mTarget.transform.parent as RectTransform;
RectTransformUtility.ScreenPointToLocalPointInRectangle(mTargetParent, eventData.position, eventData.pressEventCamera, out mLocalPointerPos);
bringToTop();
}
// Helper method to obtain a drag item for the photo at the index path.
UIDragItem DragItem(NSIndexPath indexPath)
{
var photo = Photo(indexPath);
var itemProvider = photo.ItemProvider;
var dragItem = new UIDragItem(itemProvider);
dragItem.LocalObject = photo;
return(dragItem);
}
public UIDragItem[] GetItemsForBeginningSession(UIDragInteraction interaction, IUIDragSession session)
{
bool isEven = Convert.ToInt16(NumberLabel.Text) % 2 == 0;
var provider = new NSItemProvider(new NSString(NumberLabel.Text));
var item = new UIDragItem(provider)
{
LocalObject = new NSNumber(isEven)
};
return(new UIDragItem[] { item });
}
UIDragItem[] DragItems(NSIndexPath forAlbumAt)
{
var album = this.Album(forAlbumAt);
var dragItems = album.Photos.Select((photo) => {
var itemProvider = photo.ItemProvider;
var dragItem = new UIDragItem(itemProvider);
dragItem.LocalObject = photo;
dragItem.PreviewProvider = photo.PreviewProvider;
return(dragItem);
});
return(dragItems.ToArray());
}
public void Init(UIDragItem uiDragItem)
{
items.Add(templateObj.GetComponent <UIItemShortcut>());
while (items.Count < 3)
{
var obj = Instantiate(templateObj, transform);
items.Add(obj.GetComponent <UIItemShortcut>());
}
for (int i = 0; i < items.Count; ++i)
{
items[i].Init(i, uiDragItem);
}
}
public void Init(int index, UIDragItem uiDragItem, int equipmentIndex = -1)
{
selectBG = transform.Find("SelectBG").GetComponent <Image>();
selectBG.color = Color.clear;
itemImage = transform.Find("ItemImage").GetComponent <Image>();
countText = transform.Find("CountText").GetComponent <Text>();
this.index = index;
this.uiDragItem = uiDragItem;
this.equipmentIndex = equipmentIndex;
ItemInventry.Instance.OnChangedItemCount += UpdateUI;
Load();
}
public UIDragItem [] GetItemsForBeginningDragSession(UICollectionView collectionView, IUIDragSession session, NSIndexPath indexPath)
{
var selectedPhoto = GetPhoto(indexPath);
var userActivity = selectedPhoto.OpenDetailUserActivity();
var itemProvider = new NSItemProvider(UIImage.FromFile(selectedPhoto.Name));
itemProvider.RegisterObject(userActivity, NSItemProviderRepresentationVisibility.All);
var dragItem = new UIDragItem(itemProvider)
{
LocalObject = selectedPhoto
};
return(new [] { dragItem });
}
public virtual UIDragItem[] GetItemsForBeginningSession(UIDragInteraction interaction, IUIDragSession session)
{
// no data needed since we directly have access to the view thanks to the OnTouched event
// so we put stub data so that the provider doesn't provide null objects
TouchesBegan(null, null);
var provider = new NSItemProvider(new NSString(""));
var item = new UIDragItem(provider)
{
LocalObject = new NSNumber(true)
};
return(new UIDragItem[] { item });
//return new UIDragItem[] { new UIDragItem(default(NSItemProvider)) };
}
UIDragItem[] IUIDragInteractionDelegate.GetItemsForBeginningSession(UIDragInteraction interaction, IUIDragSession session)
{
var results = new List <UIDragItem>();
foreach (QRDetectionResult qrCode in QRCodes)
{
var itemProvider = new NSItemProvider((NSString)qrCode.Message);
itemProvider.RegisterObject(qrCode.CroppedImage, NSItemProviderRepresentationVisibility.All);
var item = new UIDragItem(itemProvider)
{
LocalObject = qrCode
};
results.Add(item);
}
return(results.ToArray());
}
public UIDragItem[] GetItemsForBeginningSession(UIDragInteraction interaction, IUIDragSession session)
{
var point = session.LocationInView(interaction.View);
var index = ImageIndex(point);
if (index >= 0)
{
var image = Images[index];
var itemProvider = new NSItemProvider(image);
var dragItem = new UIDragItem(itemProvider);
dragItem.LocalObject = new NSNumber(index);
return(new UIDragItem[] { dragItem });
}
return(new UIDragItem[0]);
}
/// <summary>
/// 'GetItemsForBeginningSession' allows dragging from a view.
/// </summary>
public UIDragItem [] GetItemsForBeginningSession(UIDragInteraction interaction, IUIDragSession session)
{
var image = ImageView.Image;
if (image == null)
{
return new UIDragItem [] { }
}
;
var provider = new NSItemProvider(image);
var item = new UIDragItem(provider)
{
LocalObject = image
};
// If a non empty array is returned, dragging is enabled.
return(new UIDragItem [] { item });
}
private UITargetedDragPreview DragPreviewForItem(UIDragItem item)
{
var qrCode = item.LocalObject as QRDetectionResult;
if (qrCode == null)
{
return(new UITargetedDragPreview(this));
}
var previewView = new UIImageView(qrCode.CroppedImage);
previewView.Frame = ConvertRectToView(this.ConvertFromImageRect(qrCode.RectInOriginalImage), Window);
var target = new UIDragPreviewTarget(Window, previewView.Center);
var parameters = new UIDragPreviewParameters()
{
VisiblePath = UIBezierPath.FromRoundedRect(previewView.Bounds, 20f)
};
return(new UITargetedDragPreview(previewView, parameters, target));
}
public void WillAnimateDrop(UIDropInteraction interaction, UIDragItem item, IUIDragAnimating animator)
{
animator.AddAnimations(() => {
FadeItems(new UIDragItem[] { item }, 0f);
});
var movePoint = MovePoint; //DropPoint
animator.AddCompletion((err) => {
var index = item.LocalObject as NSNumber;
if (index != null)
{
var i = index.Int32Value;
if (i >= 0)
{
Views[i].Center = movePoint;
Views[i].Alpha = 1f;
}
}
});
}
public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
return(DragPreviewForItem(item));
}
public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
var imageView = item.LocalObject as UIImageView;
if (imageView == null)
{
return(null);
}
return(new UITargetedDragPreview(imageView));
}
public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
var imageView = new UIImageView(Image)
{
Frame = this.Frame,
ClipsToBounds = true,
ContentMode = UIViewContentMode.ScaleAspectFill
};
var target = new UIDragPreviewTarget(Superview, imageView.Center);
return(new UITargetedDragPreview(imageView, new UIDragPreviewParameters(), target));
}
public UITargetedDragPreview GetPreviewForDroppingItem(UIDropInteraction interaction, UIDragItem item, UITargetedDragPreview defaultPreview)
{
var target = new UIDragPreviewTarget(this, IconView.Center, CGAffineTransform.Scale(new CGAffineTransform(), 0.1f, 0.1f));
return(defaultPreview.GetRetargetedPreview(target));
}
public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
var index = item.LocalObject as NSNumber;
var i = index.Int32Value;
return(new UITargetedDragPreview(Views[i]));
}
public UITargetedDragPreview GetPreviewForCancellingItem(UIDragInteraction interaction, UIDragItem item, UITargetedDragPreview defaultPreview)
{
return(DragPreviewForItem(item));
}
public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
var image = item.LocalObject as UIImage;
if (image == null)
{
return(null);
}
CGRect frame;
if (image.Size.Width > image.Size.Height)
{
var multiplier = ImageView.Frame.Width / image.Size.Width;
frame = new CGRect(0, 0, ImageView.Frame.Width, ImageView.Frame.Height * multiplier);
}
else
{
var multiplier = ImageView.Frame.Height / image.Size.Height;
frame = new CGRect(0, 0, ImageView.Frame.Width * multiplier, ImageView.Frame.Height);
}
var previewImageView = new UIImageView(image)
{
ContentMode = UIViewContentMode.ScaleAspectFit,
Frame = frame
};
var target = new UIDragPreviewTarget(ImageView, ImageView.Center);
return(new UITargetedDragPreview(previewImageView, new UIDragPreviewParameters(), target));
}
public UIDragItem[] HandleDragStarting(View element, IPlatformViewHandler handler)
{
UIDragItem[] returnValue = null;
SendEventArgs <DragGestureRecognizer>(rec =>
{
if (!rec.CanDrag)
{
return;
}
var args = rec.SendDragStarting(element);
if (args.Cancel)
{
return;
}
if (!args.Handled)
{
UIImage uIImage = null;
string clipDescription = String.Empty;
NSItemProvider itemProvider = null;
if (handler.PlatformView is UIImageView iv)
{
uIImage = iv.Image;
}
if (handler.PlatformView is UIButton b && b.ImageView != null)
{
uIImage = b.ImageView.Image;
}
if (uIImage != null)
{
if (uIImage != null)
{
itemProvider = new NSItemProvider(uIImage);
}
else
{
itemProvider = new NSItemProvider(new NSString(""));
}
if (args.Data.Image == null && handler.VirtualView is IImageElement imageElement)
{
args.Data.Image = imageElement.Source;
}
}
else
{
string text = args.Data.Text ?? clipDescription;
if (String.IsNullOrWhiteSpace(text))
{
itemProvider = new NSItemProvider(handler.PlatformView.ConvertToImage());
}
else
{
itemProvider = new NSItemProvider(new NSString(text));
}
}
var dragItem = new UIDragItem(itemProvider);
dragItem.LocalObject = new CustomLocalStateData()
{
Handler = handler,
View = handler.VirtualView as View,
DataPackage = args.Data
};
returnValue = new UIDragItem[] { dragItem };
}
},
element);
return(returnValue ?? new UIDragItem[0]);
}
public UIDragItem[] HandleDragStarting(View element, IVisualElementRenderer renderer)
{
UIDragItem[] returnValue = null;
SendEventArgs <DragGestureRecognizer>(rec =>
{
if (!rec.CanDrag)
{
return;
}
var args = rec.SendDragStarting(element);
if (args.Cancel)
{
return;
}
if (!args.Handled)
{
UIImage uIImage = null;
string clipDescription = String.Empty;
NSItemProvider itemProvider = null;
if (renderer is IImageVisualElementRenderer iver)
{
uIImage = iver.GetImage()?.Image;
if (uIImage != null)
{
itemProvider = new NSItemProvider(uIImage);
}
else
{
itemProvider = new NSItemProvider(new NSString(""));
}
if (args.Data.Image == null && renderer.Element is IImageElement imageElement)
{
args.Data.Image = imageElement.Source;
}
}
else
{
string text = args.Data.Text ?? clipDescription;
if (String.IsNullOrWhiteSpace(text))
{
itemProvider = new NSItemProvider(renderer.NativeView.ConvertToImage());
}
else
{
itemProvider = new NSItemProvider(new NSString(text));
}
}
var dragItem = new UIDragItem(itemProvider);
dragItem.LocalObject = new CustomLocalStateData()
{
Renderer = renderer,
View = renderer.Element as View,
DataPackage = args.Data
};
returnValue = new UIDragItem[] { dragItem };
}
},
element);
return(returnValue ?? new UIDragItem[0]);
}
public void WillAnimateCancel(UIDragInteraction interaction, UIDragItem item, IUIDragAnimating animator)
{
animator.AddAnimations(() => {
Alpha = 1f;
});
}
public UITargetedDragPreview GetPreviewForDroppingItem(UIDropInteraction interaction, UIDragItem item, UITargetedDragPreview defaultPreview)
{
if (item.LocalObject == null)
{
return(null);
}
else
{
DropPoint = defaultPreview.View.Center;
var target = new UIDragPreviewTarget(View, DropPoint); // HACK: why is this null?
//return defaultPreview.GetRetargetedPreview(target);
return(defaultPreview);
}
}
