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com.vaadin.client.ui.dd.

Class VAbstractDropHandler

    • Constructor Detail

      • VAbstractDropHandler

        public VAbstractDropHandler()
        Deprecated.

    • Method Detail

      • updateAcceptRules

        public void updateAcceptRules​(UIDL uidl)
        Deprecated.

        Implementor/user of VAbstractDropHandler must pass the UIDL painted by AcceptCriterion to this method. Practically the details about AcceptCriterion are saved.

        Parameters:

        uidl - the accept criterion UIDL

      • dragOver

        public void dragOver​(VDragEvent drag)
        Deprecated.

        Default implementation does nothing.

        Specified by:

        dragOver in interface VDropHandler

        Parameters:

        drag - the latest drag event

      • dragLeave

        public void dragLeave​(VDragEvent drag)
        Deprecated.

        Default implementation does nothing. Implementors should clean possible emphasis or drag icons here.

        Specified by:

        dragLeave in interface VDropHandler

        Parameters:

        drag - DragEvent which contains the transferable and other information for the operation

      • dragEnter

        public void dragEnter​(VDragEvent drag)
        Deprecated.

        The default implementation in VAbstractDropHandler checks if the Transferable is accepted.

        If transferable is accepted (either via server visit or client side rules) the default implementation calls abstract dragAccepted(VDragEvent) method.

        If drop handler has distinct places where some parts may accept the Transferable and others don't, one should use similar validation logic in dragOver method and replace this method with empty implementation.

        Specified by:

        dragEnter in interface VDropHandler

        Parameters:

        drag - DragEvent which contains the transferable and other information for the operation

      • dragAccepted

        protected abstract void dragAccepted​(VDragEvent drag)
        Deprecated.

        This method is called when a valid drop location was found with AcceptCriterion either via client or server side check.

        Implementations can set some hints for users here to highlight that the drag is on a valid drop location.

        Parameters:

        drag - the drag event

      • validate

        protected void validate​(VAcceptCallback cb,
                        VDragEvent event)
        Deprecated.

        Validates the given drag event when all existing DnD-related tasks are completed, and triggers the callback if the validation was successful.

        Parameters:

        cb - the callback that handles acceptance if the target is valid

        event - the drag event

      • drop

        public boolean drop​(VDragEvent drag)
        Deprecated.

        The default implemmentation visits server if AcceptCriterion can't be verified on client or if AcceptCriterion are met on client.

        Specified by:

        drop in interface VDropHandler

        Parameters:

        drag - VDragEvent which contains the transferable and other information for the operation

        Returns:

        true if the Tranferrable of this drag event needs to be sent to the server, false if drop is rejected or no server side event should be sent