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## com.mxgraph.swing.handler
Class mxGraphHandler

    java.lang.Object
      com.mxgraph.swing.util.mxMouseAdapter
          com.mxgraph.swing.handler.mxGraphHandler

All Implemented Interfaces:
  DropTargetListener, MouseListener, MouseMotionListener, EventListener

    public class mxGraphHandler

extends mxMouseAdapter
implements DropTargetListener

Field Summary
`protected mxRectangle` | `bbox` Scaled, translated bounding box of the selection cells.
`protected boolean` | `canImport`
`protected Object` | `cell`
`protected mxRectangle` | `cellBounds` Scaled, translated bounds of the selection cells.
`protected Object[]` | `cells` Holds the cells that are being moved by this handler.
`protected boolean` | `centerPreview` Specifies if the preview should be centered around the mouse cursor if there was no mouse click to define the offset within the shape (eg.
`protected boolean` | `cloneEnabled` Specifies if cloning by control-drag is enabled.
`protected boolean` | `constrainedEvent` Workaround for shift-key-state not correct in mouseReleased.
`static Cursor` | `DEFAULT_CURSOR` Default is Cursor.DEFAULT_CURSOR.
`protected Object[]` | `dragCells`
`protected ImageIcon` | `dragImage` Holds the image that is being used for the preview.
`protected boolean` | `enabled` Specifies if the handler is enabled.
`protected Point` | `first` Holds the start location of the mouse gesture.
`static Cursor` | `FOLD_CURSOR` Default is Cursor.HAND_CURSOR.
`protected mxGraphComponent` | `graphComponent` Reference to the enclosing graph component.
`protected boolean` | `imagePreview` Specifies if an image should be used for preview.
`protected Object` | `initialCell`
`protected boolean` | `keepOnTop` Specifies if this handler should be painted on top of all other components.
`protected boolean` | `livePreview` Specifies if live preview should be used if possible.
`protected mxCellMarker` | `marker`
`protected boolean` | `markerEnabled` Specifies if the cell marker should be called (for splitting edges and dropping cells into groups).
`static Cursor` | `MOVE_CURSOR` Default is Cursor.MOVE_CURSOR.
`protected boolean` | `moveEnabled` Specifies if moving is enabled.
`protected mxMovePreview` | `movePreview`
`protected Rectangle` | `previewBounds`
`protected boolean` | `removeCellsFromParent` Specifies if cells may be moved out of their parents.
`protected boolean` | `selectEnabled` Specifies if moving is enabled.
`protected mxRectangle` | `transferBounds` Unscaled, untranslated bounding box of the selection cells.
`protected boolean` | `visible`

Constructor Summary
`mxGraphHandler(mxGraphComponent graphComponent)`

Method Summary
`Point` | `convertPoint(Point pt)`
`protected MouseEvent` | `createEvent(DropTargetEvent e)`
`protected mxCellMarker` | `createMarker()`
`protected mxMovePreview` | `createMovePreview()`
`void` | `dragEnter(DropTargetDragEvent e)`
`void` | `dragExit(DropTargetEvent e)`
`void` | `dragOver(DropTargetDragEvent e)`
`void` | `drop(DropTargetDropEvent e)`
`void` | `dropActionChanged(DropTargetDragEvent e)`
`protected void` | `fold(Object cell)`
`Object[]` | `getCells(Object initialCell)`
`protected Cursor` | `getCursor(MouseEvent e)`
`protected static JComponent` | `getDropTarget(DropTargetEvent e)` Helper method to return the component for a drop target event.
`mxGraphComponent` | `getGraphComponent()`
`protected static mxGraphTransferHandler` | `getGraphTransferHandler(DropTargetEvent e)` Helper method to return the component for a drop target event.
`protected Point` | `getPreviewLocation(MouseEvent e, boolean gridEnabled)`
`protected void` | `installDragGestureHandler()`
`protected void` | `installDropTargetHandler()`
`boolean` | `isCenterPreview()`
`boolean` | `isCloneEnabled()`
`boolean` | `isEnabled()`
`boolean` | `isImagePreview()`
`boolean` | `isLivePreview()`
`boolean` | `isMarkerEnabled()`
`boolean` | `isMoveEnabled()`
`boolean` | `isRemoveCellsFromParent()`
`boolean` | `isSelectEnabled()`
`boolean` | `isVisible()`
`void` | `mouseDragged(MouseEvent e)`
`void` | `mouseMoved(MouseEvent e)`
`void` | `mousePressed(MouseEvent e)`
`void` | `mouseReleased(MouseEvent e)`
`protected void` | `moveCells(Object[] cells, double dx, double dy, Object target, MouseEvent e)`
`void` | `paint(Graphics g)`
`void` | `reset()`
`void` | `setCenterPreview(boolean value)`
`void` | `setCloneEnabled(boolean value)`
`void` | `setEnabled(boolean value)`
`void` | `setImagePreview(boolean value)`
`void` | `setLivePreview(boolean value)`
`void` | `setMarkerEnabled(boolean value)`
`void` | `setMoveEnabled(boolean value)`
`void` | `setPreviewBounds(Rectangle bounds)`
`void` | `setRemoveCellsFromParent(boolean value)`
`void` | `setSelectEnabled(boolean value)`
`void` | `setVisible(boolean value)`
`protected boolean` | `shouldRemoveCellFromParent(Object parent, Object[] cells, MouseEvent e)` Returns true if the given cells should be removed from the parent for the specified mousereleased event.
`void` | `start(MouseEvent e)`
`void` | `updateDragImage(Object[] cells)`

Methods inherited from class com.mxgraph.swing.util.mxMouseAdapter
`mouseClicked, mouseEntered, mouseExited`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_CURSOR

    public static Cursor DEFAULT_CURSOR

  Default is Cursor.DEFAULT_CURSOR.

### MOVE_CURSOR

    public static Cursor MOVE_CURSOR

  Default is Cursor.MOVE_CURSOR.

### FOLD_CURSOR

    public static Cursor FOLD_CURSOR

  Default is Cursor.HAND_CURSOR.

### graphComponent

    protected mxGraphComponent graphComponent

  Reference to the enclosing graph component.

### enabled

    protected boolean enabled

  Specifies if the handler is enabled. Default is true.

### cloneEnabled

    protected boolean cloneEnabled

  Specifies if cloning by control-drag is enabled. Default is true.

### moveEnabled

    protected boolean moveEnabled

  Specifies if moving is enabled. Default is true.

### selectEnabled

    protected boolean selectEnabled

  Specifies if moving is enabled. Default is true.

### markerEnabled

    protected boolean markerEnabled

  Specifies if the cell marker should be called (for splitting edges and dropping cells into groups). Default is true.

### removeCellsFromParent

    protected boolean removeCellsFromParent

  Specifies if cells may be moved out of their parents. Default is true.

### movePreview

    protected mxMovePreview movePreview

### livePreview

    protected boolean livePreview

  Specifies if live preview should be used if possible. Default is false.

### imagePreview

    protected boolean imagePreview

  Specifies if an image should be used for preview. Default is true.

### centerPreview

    protected boolean centerPreview

  Specifies if the preview should be centered around the mouse cursor if there was no mouse click to define the offset within the shape (eg. drag from external source). Default is true.

### keepOnTop

    protected boolean keepOnTop

  Specifies if this handler should be painted on top of all other components. Default is true.

### cells

    protected transient Object[] cells

  Holds the cells that are being moved by this handler.

### dragImage

    protected transient ImageIcon dragImage

  Holds the image that is being used for the preview.

### first

    protected transient Point first

  Holds the start location of the mouse gesture.

### cell

    protected transient Object cell

### initialCell

    protected transient Object initialCell

### dragCells

    protected transient Object[] dragCells

### marker

    protected transient mxCellMarker marker

### canImport

    protected transient boolean canImport

### cellBounds

    protected transient mxRectangle cellBounds

  Scaled, translated bounds of the selection cells.

### bbox

    protected transient mxRectangle bbox

  Scaled, translated bounding box of the selection cells.

### transferBounds

    protected transient mxRectangle transferBounds

  Unscaled, untranslated bounding box of the selection cells.

### visible

    protected transient boolean visible

### previewBounds

    protected transient Rectangle previewBounds

### constrainedEvent

    protected transient boolean constrainedEvent

  Workaround for shift-key-state not correct in mouseReleased.

Constructor Detail

### mxGraphHandler

    public mxGraphHandler(mxGraphComponent graphComponent)

Parameters:
  `graphComponent` -

Method Detail

### installDragGestureHandler

    protected void installDragGestureHandler()

### installDropTargetHandler

    protected void installDropTargetHandler()

### isVisible

    public boolean isVisible()

### setVisible

    public void setVisible(boolean value)

### setPreviewBounds

    public void setPreviewBounds(Rectangle bounds)

### createMovePreview

    protected mxMovePreview createMovePreview()

### createMarker

    protected mxCellMarker createMarker()

### getGraphComponent

    public mxGraphComponent getGraphComponent()

### isEnabled

    public boolean isEnabled()

### setEnabled

    public void setEnabled(boolean value)

### isCloneEnabled

    public boolean isCloneEnabled()

### setCloneEnabled

    public void setCloneEnabled(boolean value)

### isMoveEnabled

    public boolean isMoveEnabled()

### setMoveEnabled

    public void setMoveEnabled(boolean value)

### isMarkerEnabled

    public boolean isMarkerEnabled()

### setMarkerEnabled

    public void setMarkerEnabled(boolean value)

### isSelectEnabled

    public boolean isSelectEnabled()

### setSelectEnabled

    public void setSelectEnabled(boolean value)

### isRemoveCellsFromParent

    public boolean isRemoveCellsFromParent()

### setRemoveCellsFromParent

    public void setRemoveCellsFromParent(boolean value)

### isLivePreview

    public boolean isLivePreview()

### setLivePreview

    public void setLivePreview(boolean value)

### isImagePreview

    public boolean isImagePreview()

### setImagePreview

    public void setImagePreview(boolean value)

### isCenterPreview

    public boolean isCenterPreview()

### setCenterPreview

    public void setCenterPreview(boolean value)

### updateDragImage

    public void updateDragImage(Object[] cells)

### mouseMoved

    public void mouseMoved(MouseEvent e)

  Specified by:
    `mouseMoved` in interface `MouseMotionListener`
  Overrides:
    `mouseMoved` in class `mxMouseAdapter`

### getCursor

    protected Cursor getCursor(MouseEvent e)

### dragEnter

    public void dragEnter(DropTargetDragEvent e)

  Specified by:
    `dragEnter` in interface `DropTargetListener`

### mousePressed

    public void mousePressed(MouseEvent e)

  Specified by:
    `mousePressed` in interface `MouseListener`
  Overrides:
    `mousePressed` in class `mxMouseAdapter`

### getCells

    public Object[] getCells(Object initialCell)

### start

    public void start(MouseEvent e)

### dropActionChanged

    public void dropActionChanged(DropTargetDragEvent e)

  Specified by:
    `dropActionChanged` in interface `DropTargetListener`

### dragOver

    public void dragOver(DropTargetDragEvent e)

  Specified by:
    `dragOver` in interface `DropTargetListener`
  Parameters:
    `e` -

### convertPoint

    public Point convertPoint(Point pt)

### mouseDragged

    public void mouseDragged(MouseEvent e)

  Specified by:
    `mouseDragged` in interface `MouseMotionListener`
  Overrides:
    `mouseDragged` in class `mxMouseAdapter`

### getPreviewLocation

    protected Point getPreviewLocation(MouseEvent e,
                                       boolean gridEnabled)

### dragExit

    public void dragExit(DropTargetEvent e)

  Specified by:
    `dragExit` in interface `DropTargetListener`
  Parameters:
    `e` -

### drop

    public void drop(DropTargetDropEvent e)

  Specified by:
    `drop` in interface `DropTargetListener`
  Parameters:
    `e` -

### mouseReleased

    public void mouseReleased(MouseEvent e)

  Specified by:
    `mouseReleased` in interface `MouseListener`
  Overrides:
    `mouseReleased` in class `mxMouseAdapter`

### fold

    protected void fold(Object cell)

### reset

    public void reset()

### shouldRemoveCellFromParent

    protected boolean shouldRemoveCellFromParent(Object parent,
                                                 Object[] cells,
                                                 MouseEvent e)

  Returns true if the given cells should be removed from the parent for the specified mousereleased event.

### moveCells

    protected void moveCells(Object[] cells,
                             double dx,
                             double dy,
                             Object target,
                             MouseEvent e)

  Parameters:
    `dx` -
    `dy` -
    `e` -

### paint

    public void paint(Graphics g)

### createEvent

    protected MouseEvent createEvent(DropTargetEvent e)

### getGraphTransferHandler

    protected static final mxGraphTransferHandler getGraphTransferHandler(DropTargetEvent e)

  Helper method to return the component for a drop target event.

### getDropTarget

    protected static final JComponent getDropTarget(DropTargetEvent e)

  Helper method to return the component for a drop target event.

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Copyright (c) 2010 Gaudenz Alder. All rights reserved.