com.vaadin.client.ui.dd.

Class DDEventHandleStrategy

  • Deprecated. 

    Replaced in 8.1 with DropTargetExtensionConnector


    @Deprecated
public class DDEventHandleStrategy
extends Object

    Strategy to handle native preview events for VDragAndDropManager. The strategy could be overridden via GWT Deferred Binding mechanism.

    Since:

    7.4.4

    Author:

    Vaadin Ltd

    • Constructor Detail

      • DDEventHandleStrategy

        public DDEventHandleStrategy()

        Deprecated. 

    • Method Detail

      • isDragInterrupted

        public boolean isDragInterrupted(com.google.gwt.user.client.Event.NativePreviewEvent event,
                                 VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Returns true if event interrupts Drag and Drop.

        Parameters:

        event - GWT event to handle

        mediator - VDragAndDropManager data accessor

        Returns:

        whether true interrupts DnD

      • handleKeyDownEvent

        public void handleKeyDownEvent(com.google.gwt.user.client.Event.NativePreviewEvent event,
                               VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Handles key down event. Default implementation doesn't do anything.

        Parameters:

        event - key down GWT event

        mediator - VDragAndDropManager data accessor

      • getTargetElement

        public com.google.gwt.dom.client.Element getTargetElement(com.google.gwt.user.client.Event.NativePreviewEvent event,
                                                          VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Get target element for event.

        Parameters:

        event - GWT event to find target

        mediator - VDragAndDropManager data accessor

        Returns:

        target element for event

      • updateDragImage

        public String updateDragImage(com.google.gwt.user.client.Event.NativePreviewEvent event,
                              VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Updates drag image DOM element. This method updates drag image position and adds additional styles. Default implementation hides drag element to be able to get target element by the point (see #getTargetElement(NativePreviewEvent, DDManagerMediator). Method #restoreDragImage(String, DDManagerMediator, NativePreviewEvent) is used later on to restore the drag element in its state before temporary update. Returns "display" CSS style property of the original drag image. This value will be passed to the #restoreDragImage(String, DDManagerMediator, NativePreviewEvent) method.

        Parameters:

        event - GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

        Returns:

        "display" CSS style property of drag image element to restore it later on

      • restoreDragImage

        public void restoreDragImage(String originalImageDisplay,
                             VDragAndDropManager.DDManagerMediator mediator,
                             com.google.gwt.user.client.Event.NativePreviewEvent event)

        Deprecated. 

        Restores drag image after temporary update by #updateDragImage(NativePreviewEvent, DDManagerMediator).

        Parameters:

        originalImageDisplay - original "display" CSS style property of drag image element

        mediator - VDragAndDropManager data accessor

        event - GWT event for active DnD operation

      • handleDragImageEvent

        public boolean handleDragImageEvent(com.google.gwt.dom.client.Element target,
                                    com.google.gwt.user.client.Event.NativePreviewEvent event,
                                    VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Handles event when drag image element ( VDragAndDropManager.getDragElement() return value) is not null or event is touch event. If method returns true then event processing will be stoped.

        Parameters:

        target - target element over which DnD event has happened

        event - GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

        Returns:

        true is strategy handled the event and no further steps to handle required.

      • handleDragEnter

        protected void handleDragEnter(com.google.gwt.dom.client.Element target,
                               VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Handles drag enter on new element.

        Parameters:

        mediator - VDragAndDropManager data accessor

        target - target element over which DnD event has happened

      • handleDragOver

        protected void handleDragOver(com.google.gwt.dom.client.Element target,
                              VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Handles drag over on element.

        Parameters:

        mediator - VDragAndDropManager data accessor

        target - target element over which DnD event has happened

      • handleEvent

        public void handleEvent(com.google.gwt.dom.client.Element targetElement,
                        com.google.gwt.user.client.Event.NativePreviewEvent event,
                        VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Final phase of event handling.

        Parameters:

        targetElement - target element over which DnD event has happened

        event - GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

      • handleMouseMove

        protected void handleMouseMove(com.google.gwt.dom.client.Element target,
                               com.google.gwt.user.client.Event.NativePreviewEvent event,
                               VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Called to handle Event.ONMOUSEMOVE event.

        Parameters:

        target - target element over which DnD event has happened

        event - ONMOUSEMOVE GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

      • handleTouchEnd

        protected void handleTouchEnd(com.google.gwt.dom.client.Element target,
                              com.google.gwt.user.client.Event.NativePreviewEvent event,
                              VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Called to handle Event.ONTOUCHEND event.

        Parameters:

        target - target element over which DnD event has happened

        event - ONTOUCHEND GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

      • handleMouseUp

        protected void handleMouseUp(com.google.gwt.dom.client.Element target,
                             com.google.gwt.user.client.Event.NativePreviewEvent event,
                             VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Called to handle Event.ONMOUSEUP event.

        Parameters:

        target - target element over which DnD event has happened

        event - ONMOUSEUP GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

      • handleMouseOut

        protected void handleMouseOut(com.google.gwt.dom.client.Element target,
                              com.google.gwt.user.client.Event.NativePreviewEvent event,
                              VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Called to handle Event.ONMOUSEOUT event.

        Parameters:

        target - target element over which DnD event has happened

        event - ONMOUSEOUT GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

      • handleDragLeave

        protected void handleDragLeave(VDragAndDropManager.DDManagerMediator mediator,
                               boolean clearServerCallback)

        Deprecated. 

        Handles drag leave on old element.

        Parameters:

        mediator - VDragAndDropManager data accessor

        clearServerCallback - true if server communication callback should be cleaned up, false otherwise

      • handleMouseOver

        protected void handleMouseOver(com.google.gwt.dom.client.Element target,
                               com.google.gwt.user.client.Event.NativePreviewEvent event,
                               VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Called to handle Event.ONMOUSEOVER event.

        Parameters:

        target - target element over which DnD event has happened

        event - ONMOUSEOVER GWT event for active DnD operation

        mediator - VDragAndDropManager data accessor

      • findDragTarget

        protected VDropHandler findDragTarget(com.google.gwt.dom.client.Element target,
                                      VDragAndDropManager.DDManagerMediator mediator)

        Deprecated. 

        Find drag handler for the target element.

        Parameters:

        target - target element over which DnD event has happened

        mediator - VDragAndDropManager data accessor

        Returns:

        drop handler of target element