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Drag and Drop Release Notes
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2.4.1
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No change
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2.4.0
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  * Added configuration option called "dragOnly". If dragOnly is set to true,
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    all event in the fireEvents method will not fire. These events are:
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        onInvalidDrop
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        b4DragOut & onDragOut
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        onDragEnter
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        b4DragOver & onDragOver
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        b4DragDrop & onDragDrop
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    This config option should be used to drag elements that have no need for
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        drop interaction. They are elements that just need to move.
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2.3.1
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  * No change
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2.3.0
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  * YAHOO.util.DragDropMgr.stopDrag is now public, and can be used to cancel
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    a drag in progress.  An optional "silent" flag was added to skip the
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    onMouseUp and endDrag functions when needed (eliminating the need to
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    supply mouseup page coordinates to these functions).
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  * DDProxy: the position of the proxy is not set before the drag is confirmed,
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    preventing auto-scroll from distrupting the user experience.
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  * Modified the default proxy so that IE properly registers the proxy as
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    the event target during the drag.
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  * If a dd instance is created using a dom reference rather than an id, that
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    reference is stored and used throughout making it possible to control
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    instances outside the current window.
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  * The document mousemove listener no longer returns true.
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2.2.2
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  * No change
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2.2.1
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  * Added YAHOO.util.DragDropMgr.interactionInfo, which is
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    a repository of interaction information accumulated during
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    the current event loop result, and accessible from the
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    handlers for the events.
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  * The region for the dragged element is now cached while
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    processing the drag and drop events
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  * List example supports moving an item to an empty list
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  * Fixed missing html tags in the examples
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  * The debug version now works when included before the logger is included.
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2.2.0
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  * onMouseDown event is executed before element positions are calculated
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  * refreshCache refreshes everything if groups array is not provided
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  * setX/setYConstraint doesn't fail when presented ints cast as strings
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0.12.2
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  * No change
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0.12.1
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  * Added a STRICT_INTERSECT drag and drop interaction mode.  This alters the
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    behavior of DDM::getBestMatch.  INTERSECT mode first tests the cursor
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    location, and if it is over the target that target wins, otherwise it
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    tests the overlap of the elements.  STRICT_INTERSECT mode tests only
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    the overlap, the largest overlap wins.
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  * getBestMatch will work for targeted elements that have no overlap.
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0.12.0
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   * The logic to determine if a drag should be initiated has been isolated
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     to the clickValidator method.  This method can be overridden to provide
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     custom valdiation logic.  For example, it is possible to specify hotspots
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     of any dimension or shape.  The provided example shows how to make only
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     a circular region in the middle of the element initiate a drag.
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   * Added a new drag and drop event: onInvalidDrop.  This is executed when
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     the dragged element in dropped in a location without a target.  Previously
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     this condition could only detected by implementing handlers for three
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     other events.
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   * Now accepts an element reference in lieu of an id.  Ids will
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     be generated if the element does not have one.
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   * Fixed horizontal autoscroll when scrollTop is zero.
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   * Added hasOuterHandles property to bypass the isOverTarget check in the
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     mousedown validation routine.  Fixes setOuterHandleElId.
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0.11.4
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   * YAHOO.util.DragDropMgr.swapNode now handles adjacent nodes properly
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   * Fixed missing variable declarations
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0.11.3
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   * Fixed a JavaScript error that would be generated when trying to implement
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     DDProxy using the default settings and a tiny element.
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   * Fixed an error that resulted when constraints were applied to DragDrop
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     instances.
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0.11.2
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   * Drag and drop will no longer interfere with selecting text on elements
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     that are not involved in drag and drop.
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   * The shared drag and drop proxy element now resizes correctly when autoResize
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     is enabled.
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0.11.1
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   * Fixes an issue where the setXY cache could get out of sync if the element's
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     offsetParent is changed during onDragDrop.
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0.11.0
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   * The Dom.util.setXY calculation for the initial placement of the dragged
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     element is cached during the drag, enhancing the drag performance.
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   * DDProxy no longer enforces having a single proxy element for all instances.
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     dragElId can be set in the config object in the constructor.  If the
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     element already exists it will use that element, otherwise a new one will
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     be created with that id.
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   * DDProxy->borderWidth has been removed. The value is calculated on the fly
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     instead.
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   * Added DragDrop->clearTicks and DragDrop->clearConstraints
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   * All drag and drop constructors now have an additional, optional parameter
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     call "config".  It is an object that can contain properties for a
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     number of configuration settings.
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   * Drag and drop will not be disabled for elements that cannot have their
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     location determined.
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   * isLegalTarget won't return dd objects that are not targetable.
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   * Added DragDrop->removeFromGroup.
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   * Constraints are now applied properly when determining which drag and drop
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     events should fire.
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0.10.0
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   * Improved the performance when in intersect mode
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   * It was possible for the drag and drop initialization to be skipped
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     for very slow loading pages.  This was fixed.
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   * New methods to exclude regions within your drag and drop element:
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     addInvalidHandleId(), addInvalidHandleClass()
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   * Added an onAvailable handler that is executed after the initial state is set.
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   * Drag and drop is more forgiving when the implementer attempts to create the
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     instance prior to the element being in the document, but after the window
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     load event has fired.