@maxgraph/core
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    Class DragSource

    Wrapper to create a drag source from a DOM element so that the element can be dragged over a graph and dropped into the graph as a new cell.

    Problem is that in the dropHandler the current preview location is not available, so the preview and the dropHandler must match.

    Index

    Constructors

    constructor

    Properties

    autoscroll checkEventSource currentDropTarget currentGraph currentGuide currentHighlight currentPoint dragElement dragElementOpacity dragElementZIndex dragOffset dropHandler element enabled eventConsumer eventSource gridEnabled guidesEnabled highlightDropTargets mouseMoveHandler mouseUpHandler previewElement previewOffset

    Methods

    createDragElement createPreviewElement dragEnter dragExit dragOver drop getDropTarget getElementForEvent getGraphForEvent graphContainsEvent isActive isEnabled isGridEnabled isGuidesEnabled mouseDown mouseMove mouseUp removeDragElement removeListeners reset setEnabled setGridEnabled setGuidesEnabled startDrag stopDrag

    Constructors

    Properties

    autoscroll: boolean = true

    Specifies if the graph should scroll automatically. Default is true.

    checkEventSource: boolean = true

    Whether the event source should be checked in graphContainerEvent. Default is true.

    currentDropTarget: null | Cell = null

    Holds the current drop target under the mouse.

    currentGraph: null | AbstractGraph = null

    Reference to the AbstractGraph that is the current drop target.

    currentGuide: null | Guide = null

    Holds an Guide for the currentGraph if dragPreview is not null.

    currentHighlight: null | CellHighlight = null

    Holds an Guide for the currentGraph if dragPreview is not null.

    wrong doc

    currentPoint: null | Point = null

    Holds the current drop location.

    dragElement: null | HTMLElement = null

    Holds the DOM node that is used to represent the drag preview. If this is null then the source element will be cloned and used for the drag preview.

    dragElementOpacity: number = 70

    Opacity of the drag element in %. Default is 70.

    dragElementZIndex: number = 100

    ZIndex for the drag element. Default is 100.

    dragOffset: null | Point = null

    Point that specifies the offset of the dragElement. Default is null.

    dropHandler: DropHandler

    Holds the DOM node that is used to represent the drag preview. If this is null then the source element will be cloned and used for the drag preview.

    element: EventTarget

    Reference to the DOM node which was made draggable.

    enabled: boolean = true

    Specifies if this drag source is enabled. Default is true.

    eventConsumer: (sender: EventSource, evt: EventObject) => void
    eventSource: null | EventTarget = null
    gridEnabled: boolean = true

    Specifies if the grid should be allowed. Default is true.

    guidesEnabled: boolean = true

    Specifies if Guide should be enabled. Default is true.

    highlightDropTargets: boolean = true

    Specifies if drop targets should be highlighted. Default is true.

    mouseMoveHandler: null | ((evt: MouseEvent) => void) = null
    mouseUpHandler: null | ((evt: MouseEvent) => void) = null
    previewElement: null | HTMLElement = null

    TODO - wrong description Optional Rectangle that specifies the unscaled size of the preview.

    previewOffset: null | Point = null

    Optional Point that specifies the offset of the preview in pixels.

    Methods

    • Creates and returns a clone of the dragElementPrototype or the element if the former is not defined.

      Parameters

      • evt: MouseEvent

      Returns HTMLElement

    • Returns the topmost element under the given event.

      Parameters

      • evt: MouseEvent

      Returns null | EventTarget

    • Returns the graph for the given mouse event. This implementation returns null.

      Parameters

      • evt: MouseEvent

      Returns null

    • Returns the drop target for the given graph and coordinates. This implementation uses AbstractGraph.getCellAt.

      To ignore popup menu events for a drag source, this function can be overridden as follows.

      const mouseDown = dragSource.mouseDown;

      dragSource.mouseDown(evt) {
        if (!EventUtils.isPopupTrigger(evt)) {
          mouseDown.apply(this, [evt]);
        }
      };

      Parameters

      • evt: MouseEvent

      Returns void

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