goog.fx.AbstractDragDrop

Adds an event listener to the event target. The same handler can only be added once per the type. Even if you add the same handler multiple times using the same type then it will only be called once when the event is dispatched.

Add item to drag object.

Invokes a callback function when this object is disposed. Callbacks are invoked in the order in which they were added. If a callback is added to an already disposed Disposable, it will be called immediately.

Makes drag and drop aware of a target container that could scroll mid drag.

Associate drop target with drag element.

Called after a drag operation has finished.

Creates an element for the item being dragged.

Generates an element to follow the cursor during dragging, given a drag source element. The default behavior is simply to clone the source element, but this may be overridden in subclasses. This method is called by createDragElement() before the drag class is added.

Creates the Dragger for the drag element.

Dispatches an event (or event like object) and calls all listeners listening for events of this type. The type of the event is decided by the type property on the event object.

If any of the listeners returns false OR calls preventDefault then this function will return false. If one of the capture listeners calls stopPropagation, then the bubble listeners won't fire.

Disposes of the object and its resources.

Called once a drag operation has finished. Removes event listeners and elements.

Removes listeners from this object. Classes that extend EventTarget may need to override this method in order to remove references to DOM Elements and additional listeners.

Called when removing an item. Removes event listeners and classes.

Event handler that's used to stop drag. Fires a drop event if over a valid target.

Fires all registered listeners in this listenable for the given type and capture mode, passing them the given eventObject. This does not perform actual capture/bubble. Only implementors of the interface should be using this.

Returns the position for the drag element.

Returns the dragger object.

Calculates the position and dimension of a draggable element.

Get the position of a drag event.

Gets the goog.events.ListenableKey for the event or null if no such listener is in use.

Gets all listeners in this listenable for the given type and capture mode.

Returns the parent of this event target to use for capture/bubble mechanism.

NOTE(chrishenry): The name reflects the original implementation of custom event target (goog.events.EventTarget). We decided that changing the name is not worth it.

Gets the scroll distance as a coordinate object, using the window of the current drag element's dom.

Whether there is any active listeners matching the specified signature. If either the type or capture parameters are unspecified, the function will match on the remaining criteria.

Initialize drag and drop functionality for sources/targets already added. Sources/targets added after init has been called will initialize themselves one by one.

Initializes a single item.

Whether the control has been initialized.

Checks whatever a given point is inside a given box.

Adds an event listener. A listener can only be added once to an object and if it is added again the key for the listener is returned. Note that if the existing listener is a one-off listener (registered via listenOnce), it will no longer be a one-off listener after a call to listen().

Adds an event listener that is removed automatically after the listener fired once.

If an existing listener already exists, listenOnce will do nothing. In particular, if the listener was previously registered via listen(), listenOnce() will not turn the listener into a one-off listener. Similarly, if there is already an existing one-off listener, listenOnce does not modify the listeners (it is still a once listener).

Starts a drag event for an item if the mouse button stays pressed and the cursor moves a few pixels. Allows dragging of items without first having to register them with addItem.

Recalculates the geometry of this source's drag targets. Call this if the position or visibility of a drag target has changed during a drag, or if targets are added or removed.

TODO(user): this is an expensive operation; more efficient APIs may be necessary.

Recalculates the current scroll positions of scrollable containers and allocates targets. Call this if the position of a container changed or if targets are added or removed.

Associates a disposable object with this object so that they will be disposed together.

Removes all listeners from this listenable. If type is specified, it will only remove listeners of the particular type. otherwise all registered listeners will be removed.

Removes all scrollable containers.

Removes an event listener from the event target. The handler must be the same object as the one added. If the handler has not been added then nothing is done.

Removes all items.

Removes the specified target from the list of drop targets.

Set class to add to source elements being dragged.

Sets the parent of this event target to use for capture/bubble mechanism.

Sets the SCROLL event target to make drag element follow scrolling.

Set class to add to source elements.

Set a function that provides subtargets. A subtargeting function returns an arbitrary identifier for each subtarget of an element. DnD code will generate additional drag over / out events when switching from subtarget to subtarget. This is useful for instance if you are interested if you are on the top half or the bottom half of the element. The provided function will be given the DragDropItem, box, x, y box is the current window coordinates occupied by element x, y is the mouse position in window coordinates

Set class to add to target elements.

Sets the target to be used for event.target when firing event. Mainly used for testing. For example, see goog.testing.events.mixinListenable.

Event handler that's used to start drag.

Removes an event listener which was added with listen() or listenOnce().

Removes an event listener which was added with listen() by the key returned by listen().

If monitoring the goog.Disposable instances is enabled, stores the creation stack trace of the Disposable instance.

List of items that makes up the drag source or drop target.

Constant for distance threshold, in pixels, an element has to be moved to initiate a drag operation.