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## com.mxgraph.swing.handler
Class mxEdgeHandler

    java.lang.Object
      com.mxgraph.swing.handler.mxCellHandler
          com.mxgraph.swing.handler.mxEdgeHandler

Direct Known Subclasses:
  mxElbowEdgeHandler

    public class mxEdgeHandler

extends mxCellHandler

Field Summary
`protected boolean` | `cloneEnabled`
`protected boolean` | `constrainedEvent` Workaround for shift-key-state not correct in mouseReleased.
`protected String` | `error`
`protected boolean` | `gridEnabledEvent` Workaround for alt-key-state not correct in mouseReleased.
`protected mxCellMarker` | `marker`
`protected Point[]` | `p`

Fields inherited from class com.mxgraph.swing.handler.mxCellHandler
`bounds, first, graphComponent, handles, handlesVisible, index, preview, state`

Constructor Summary
`mxEdgeHandler(mxGraphComponent graphComponent, mxCellState state)`

Method Summary
`protected void` | `connect(Object edge, Object terminal, boolean isSource, boolean isClone)` Connects the given edge to the given source or target terminal.
`protected mxPoint` | `convertPoint(mxPoint point, boolean gridEnabled)`
`protected Rectangle` | `createHandle(Point center)`
`protected Rectangle` | `createHandle(Point center, int size)`
`protected Rectangle[]` | `createHandles()` Creates the rectangles that define the handles.
`protected Point[]` | `createPoints(mxCellState s)`
`protected JComponent` | `createPreview()` Creates the preview for this handler.
`protected Cursor` | `getCursor(MouseEvent e, int index)` Returns the cursor for the given event and handle.
`protected Color` | `getHandleFillColor(int index)` Returns the color to be used to fill the handle at the specified index.
`int` | `getIndexAt(int x, int y)` Returns the index of the handle at the given location.
`protected Rectangle` | `getPreviewBounds()`
`protected Color` | `getSelectionColor()`
`protected Stroke` | `getSelectionStroke()`
`protected boolean` | `isCellBendable()`
`boolean` | `isCloneEnabled()`
`protected boolean` | `isFlipEvent(MouseEvent e)`
`protected boolean` | `isHandleVisible(int index)` Hides the middle handle if the edge is not bendable.
`protected boolean` | `isIgnoredEvent(MouseEvent e)` No flip event is ignored.
`boolean` | `isSource(int index)` Returns true if the current index is 0.
`boolean` | `isTarget(int index)` Returns true if the current index is the last index.
`void` | `mouseDragged(MouseEvent e)` Processes the given event.
`void` | `mousePressed(MouseEvent e)` Processes the given event.
`void` | `mouseReleased(MouseEvent e)` Processes the given event.
`protected void` | `moveLabelTo(mxCellState edgeState, double x, double y)` Moves the label to the given position.
`protected void` | `movePoint(Object edge, int pointIndex, mxPoint point)` Moves the edges control point with the given index to the given point.
`void` | `paint(Graphics g)` Paints the visible handles of this handler.
`void` | `reset()` Extends the implementation to reset the current error and marker.
`void` | `setCloneEnabled(boolean cloneEnabled)`
`String` | `validateConnection(Object source, Object target)` Returns the error message or an empty string if the connection for the given source target pair is not valid.

Methods inherited from class com.mxgraph.swing.handler.mxCellHandler
`getBounds, getGraphComponent, getHandleBorderColor, getHandleCount, getIndex, getState, getToolTipText, isActive, isHandleEnabled, isHandlesVisible, isLabel, isLabelMovable, mouseMoved, refresh, setHandlesVisible, start`

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

Field Detail

### cloneEnabled

    protected boolean cloneEnabled

### p

    protected Point[] p

### error

    protected transient String error

### gridEnabledEvent

    protected transient boolean gridEnabledEvent

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

### constrainedEvent

    protected transient boolean constrainedEvent

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

### marker

    protected mxCellMarker marker

Constructor Detail

### mxEdgeHandler

    public mxEdgeHandler(mxGraphComponent graphComponent,
                         mxCellState state)

Parameters:
  `graphComponent` -
  `state` -

Method Detail

### setCloneEnabled

    public void setCloneEnabled(boolean cloneEnabled)

### isCloneEnabled

    public boolean isCloneEnabled()

### isIgnoredEvent

    protected boolean isIgnoredEvent(MouseEvent e)

  No flip event is ignored.

  Overrides:
    `isIgnoredEvent` in class `mxCellHandler`

### isFlipEvent

    protected boolean isFlipEvent(MouseEvent e)

### validateConnection

    public String validateConnection(Object source,
                                     Object target)

  Returns the error message or an empty string if the connection for the given source target pair is not valid. Otherwise it returns null.

### isSource

    public boolean isSource(int index)

  Returns true if the current index is 0.

### isTarget

    public boolean isTarget(int index)

  Returns true if the current index is the last index.

### isHandleVisible

    protected boolean isHandleVisible(int index)

  Hides the middle handle if the edge is not bendable.

  Overrides:
    `isHandleVisible` in class `mxCellHandler`

### isCellBendable

    protected boolean isCellBendable()

### createHandles

    protected Rectangle[] createHandles()

  Description copied from class: `mxCellHandler`
  Creates the rectangles that define the handles.

  Overrides:
    `createHandles` in class `mxCellHandler`

### getHandleFillColor

    protected Color getHandleFillColor(int index)

  Description copied from class: `mxCellHandler`
  Returns the color to be used to fill the handle at the specified index.

  Overrides:
    `getHandleFillColor` in class `mxCellHandler`

### getIndexAt

    public int getIndexAt(int x,
                          int y)

  Description copied from class: `mxCellHandler`
  Returns the index of the handle at the given location.

  Overrides:
    `getIndexAt` in class `mxCellHandler`
  Parameters:
    `x` -
    `y` -
  Returns:
    Returns the inde of the handle at the given location.

### createHandle

    protected Rectangle createHandle(Point center)

### createHandle

    protected Rectangle createHandle(Point center,
                                     int size)

### createPoints

    protected Point[] createPoints(mxCellState s)

### createPreview

    protected JComponent createPreview()

  Description copied from class: `mxCellHandler`
  Creates the preview for this handler.

  Overrides:
    `createPreview` in class `mxCellHandler`

### convertPoint

    protected mxPoint convertPoint(mxPoint point,
                                   boolean gridEnabled)

  Parameters:
    `point` -
    `gridEnabled` -
  Returns:
    Returns the scaled, translated and grid-aligned point.

### getPreviewBounds

    protected Rectangle getPreviewBounds()

  Returns:
    Returns the bounds of the preview.

### mousePressed

    public void mousePressed(MouseEvent e)

  Description copied from class: `mxCellHandler`
  Processes the given event.

  Overrides:
    `mousePressed` in class `mxCellHandler`

### mouseDragged

    public void mouseDragged(MouseEvent e)

  Description copied from class: `mxCellHandler`
  Processes the given event.

  Overrides:
    `mouseDragged` in class `mxCellHandler`

### mouseReleased

    public void mouseReleased(MouseEvent e)

  Description copied from class: `mxCellHandler`
  Processes the given event.

  Overrides:
    `mouseReleased` in class `mxCellHandler`

### reset

    public void reset()

  Extends the implementation to reset the current error and marker.

  Overrides:
    `reset` in class `mxCellHandler`

### movePoint

    protected void movePoint(Object edge,
                             int pointIndex,
                             mxPoint point)

  Moves the edges control point with the given index to the given point.

### connect

    protected void connect(Object edge,
                           Object terminal,
                           boolean isSource,
                           boolean isClone)

  Connects the given edge to the given source or target terminal.

  Parameters:
    `edge` -
    `terminal` -
    `isSource` -

### moveLabelTo

    protected void moveLabelTo(mxCellState edgeState,
                               double x,
                               double y)

  Moves the label to the given position.

### getCursor

    protected Cursor getCursor(MouseEvent e,
                               int index)

  Description copied from class: `mxCellHandler`
  Returns the cursor for the given event and handle.

  Overrides:
    `getCursor` in class `mxCellHandler`

### getSelectionColor

    protected Color getSelectionColor()

### getSelectionStroke

    protected Stroke getSelectionStroke()

### paint

    public void paint(Graphics g)

  Description copied from class: `mxCellHandler`
  Paints the visible handles of this handler.

  Overrides:
    `paint` in class `mxCellHandler`

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