com.mxgraph.swing.handler

Class mxConnectionHandler

java.lang.Object

com.mxgraph.swing.util.mxMouseAdapter

com.mxgraph.swing.handler.mxConnectionHandler

All Implemented Interfaces:

MouseListener, MouseMotionListener, EventListener

public class mxConnectionHandler
extends mxMouseAdapter

Connection handler creates new connections between cells. This control is used to display the connector icon, while the preview is used to draw the line. mxEvent.CONNECT fires between begin- and endUpdate in mouseReleased. The cell property contains the inserted edge, the event and target properties contain the respective arguments that were passed to mouseReleased.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	active
protected Rectangle	bounds
static Cursor	CONNECT_CURSOR
protected ImageIcon	connectIcon Specifies the icon to be used for creating new connections.
protected mxConnectPreview	connectPreview
protected boolean	createTarget Specifies if the source should be cloned and used as a target if no target was selected.
protected boolean	enabled
protected String	error
protected mxEventSource	eventSource Holds the event source.
protected Point	first
protected mxGraphComponent	graphComponent
protected boolean	handleEnabled Specifies if a handle should be used for creating new connections.
protected int	handleSize Specifies the size of the handle to be used for creating new connections.
protected boolean	keepOnTop Appearance and event handling order wrt subhandles.
protected mxCellMarker	marker
protected mxEventSource.mxIEventListener	resetHandler
protected boolean	select
protected mxCellState	source

Constructor Summary

Constructors

Constructor and Description
mxConnectionHandler(mxGraphComponent graphComponent)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addGraphListeners(mxGraph graph) Installs the listeners to update the handles after any changes.
void	addListener(String eventName, mxEventSource.mxIEventListener listener) Adds the given event listener.
protected mxConnectPreview	createConnectPreview()
Object	createTargetVertex(MouseEvent e, Object source)
ImageIcon	getConnecIcon()
mxConnectPreview	getConnectPreview()
int	getHandleSize()
mxCellMarker	getMarker()
boolean	isActive()
boolean	isConnecting() Returns true if the source terminal has been clicked and a new connection is currently being previewed.
boolean	isCreateTarget()
boolean	isEnabled()
boolean	isHandleEnabled()
boolean	isHighlighting() Returns true if no connectIcon is specified and handleEnabled is false.
boolean	isKeepOnTop()
boolean	isSelect()
boolean	isValidSource(Object cell)
boolean	isValidTarget(Object cell) Returns true.
void	mouseDragged(MouseEvent e)
void	mouseMoved(MouseEvent e)
void	mousePressed(MouseEvent e)
void	mouseReleased(MouseEvent e)
void	paint(Graphics g)
protected void	removeGraphListeners(mxGraph graph) Removes all installed listeners.
void	removeListener(mxEventSource.mxIEventListener listener) Removes the given event listener.
void	removeListener(mxEventSource.mxIEventListener listener, String eventName) Removes the given event listener for the specified event name.
void	reset()
void	setBounds(Rectangle value)
void	setConnectIcon(ImageIcon value)
void	setConnectPreview(mxConnectPreview value)
void	setCreateTarget(boolean value)
void	setEnabled(boolean value)
void	setHandleEnabled(boolean value)
void	setHandleSize(int value)
void	setKeepOnTop(boolean value)
void	setMarker(mxCellMarker value)
void	setSelect(boolean value)
void	start(MouseEvent e, mxCellState state)
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.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

CONNECT_CURSOR

public static Cursor CONNECT_CURSOR

graphComponent

protected mxGraphComponent graphComponent

eventSource

protected mxEventSource eventSource

Holds the event source.

connectPreview

protected mxConnectPreview connectPreview

connectIcon

protected ImageIcon connectIcon

Specifies the icon to be used for creating new connections. If this is specified then it is used instead of the handle. Default is null.

handleSize

protected int handleSize

Specifies the size of the handle to be used for creating new connections. Default is mxConstants.CONNECT_HANDLE_SIZE.

handleEnabled

protected boolean handleEnabled

Specifies if a handle should be used for creating new connections. This is only used if no connectIcon is specified. If this is false, then the source cell will be highlighted when the mouse is over the hotspot given in the marker. Default is mxConstants.CONNECT_HANDLE_ENABLED.

select

protected boolean select

createTarget

protected boolean createTarget

Specifies if the source should be cloned and used as a target if no target was selected. Default is false.

keepOnTop

protected boolean keepOnTop

Appearance and event handling order wrt subhandles.

enabled

protected boolean enabled

first

protected transient Point first

active

protected transient boolean active

bounds

protected transient Rectangle bounds

source

protected transient mxCellState source

marker

protected transient mxCellMarker marker

error

protected transient String error

resetHandler

protected transient mxEventSource.mxIEventListener resetHandler

Constructor Detail

mxConnectionHandler

public mxConnectionHandler(mxGraphComponent graphComponent)

Parameters:

graphComponent -

Method Detail

addGraphListeners

protected void addGraphListeners(mxGraph graph)

Installs the listeners to update the handles after any changes.

removeGraphListeners

protected void removeGraphListeners(mxGraph graph)

Removes all installed listeners.

createConnectPreview

protected mxConnectPreview createConnectPreview()

getConnectPreview

public mxConnectPreview getConnectPreview()

setConnectPreview

public void setConnectPreview(mxConnectPreview value)

isConnecting

public boolean isConnecting()

Returns true if the source terminal has been clicked and a new connection is currently being previewed.

isActive

public boolean isActive()

isHighlighting

public boolean isHighlighting()

Returns true if no connectIcon is specified and handleEnabled is false.

isEnabled

public boolean isEnabled()

setEnabled

public void setEnabled(boolean value)

isKeepOnTop

public boolean isKeepOnTop()

setKeepOnTop

public void setKeepOnTop(boolean value)

setConnectIcon

public void setConnectIcon(ImageIcon value)

getConnecIcon

public ImageIcon getConnecIcon()

setHandleEnabled

public void setHandleEnabled(boolean value)

isHandleEnabled

public boolean isHandleEnabled()

setHandleSize

public void setHandleSize(int value)

getHandleSize

public int getHandleSize()

getMarker

public mxCellMarker getMarker()

setMarker

public void setMarker(mxCellMarker value)

setCreateTarget

public void setCreateTarget(boolean value)

isCreateTarget

public boolean isCreateTarget()

setSelect

public void setSelect(boolean value)

isSelect

public boolean isSelect()

reset

public void reset()

createTargetVertex

public Object createTargetVertex(MouseEvent e,
                        Object source)

isValidSource

public boolean isValidSource(Object cell)

isValidTarget

public boolean isValidTarget(Object cell)

Returns true. The call to mxGraph.isValidTarget is implicit by calling mxGraph.getEdgeValidationError in validateConnection. This is an additional hook for disabling certain targets in this specific handler.

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.

mousePressed

public void mousePressed(MouseEvent e)

Specified by:

mousePressed in interface MouseListener

Overrides:

mousePressed in class mxMouseAdapter

start

public void start(MouseEvent e,
         mxCellState state)

mouseMoved

public void mouseMoved(MouseEvent e)

Specified by:

mouseMoved in interface MouseMotionListener

Overrides:

mouseMoved in class mxMouseAdapter

mouseDragged

public void mouseDragged(MouseEvent e)

Specified by:

mouseDragged in interface MouseMotionListener

Overrides:

mouseDragged in class mxMouseAdapter

mouseReleased

public void mouseReleased(MouseEvent e)

Specified by:

mouseReleased in interface MouseListener

Overrides:

mouseReleased in class mxMouseAdapter

setBounds

public void setBounds(Rectangle value)

addListener

public void addListener(String eventName,
               mxEventSource.mxIEventListener listener)

Adds the given event listener.

removeListener

public void removeListener(mxEventSource.mxIEventListener listener)

Removes the given event listener.

removeListener

public void removeListener(mxEventSource.mxIEventListener listener,
                  String eventName)

Removes the given event listener for the specified event name.

paint

public void paint(Graphics g)