org.jgraph.plaf.basic
Class BasicGraphUI.RootHandle

java.lang.Object
  org.jgraph.plaf.basic.BasicGraphUI.RootHandle

All Implemented Interfaces:

CellHandle, Serializable

Enclosing class:

BasicGraphUI

public class BasicGraphUI.RootHandle

extends Object

implements CellHandle, Serializable

See Also:

Serialized Form

Field Summary

protected double	_mouseToViewDelta_x
protected double	_mouseToViewDelta_y
protected CellHandle	activeHandle The handle that consumed the last mousePressedEvent.
protected boolean	blockPaint
protected Rectangle2D	cachedBounds
protected GraphContext	context
protected CellView[]	contextViews
protected Point2D	current
protected ConnectionSet	disconnect
protected boolean	firstDrag
protected CellHandle[]	handles
protected CellView	ignoreTargetGroup
protected Point2D	initialLocation
protected boolean	isContextVisible
protected boolean	isDragging Indicates whether this handle has started drag and drop.
protected boolean	isMoving Indicates whether this handle is currently moving cells.
protected Point2D	last
protected Graphics	offgraphics Reference to graph off screen graphics
protected CellView[]	portViews
protected Point2D	snapLast
protected Point2D	snapStart
protected Point2D	start
protected CellView	targetGroup
protected CellView[]	views

Constructor Summary

BasicGraphUI.RootHandle(GraphContext ctx)
Creates a root handle which contains handles for the given cells.

Method Summary

protected Point2D	constrainDrag(MouseEvent event, double totDx, double totDy, double dx, double dy) Hook method to constrain a mouse drag
protected CellView	findUnselectedInnermostGroup(double x, double y) Used for move into group to find the target group.
protected CellView	findViewForPoint(Point2D pt) Hook for subclassers to return a different view for a mouse click at pt.
GraphContext	getContext()
Component	getFirstOpaqueParent(Component component)
protected Point2D	getInitialLocation(Object[] cells) Returns the initial location, which is the top left corner of the selection, ignoring all connected endpoints of edges.
protected void	initOffscreen()
void	mouseDragged(MouseEvent event) Process mouse dragged event.
void	mouseMoved(MouseEvent event) Invoked when the mouse pointer has been moved on a component (with no buttons down).
void	mousePressed(MouseEvent event) Messaged when a mouse button is pressed.
void	mouseReleased(MouseEvent event) Messaged when the drag operation has terminated with a drop.
void	overlay(Graphics g) Paint the handle on the given graphics object during mouse operations.
void	paint(Graphics g) Paint the handle on the given graphics object once.
protected void	startDragging(MouseEvent event)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

_mouseToViewDelta_x

protected transient double _mouseToViewDelta_x

_mouseToViewDelta_y

protected transient double _mouseToViewDelta_y

firstDrag

protected transient boolean firstDrag

views

protected transient CellView[] views

contextViews

protected transient CellView[] contextViews

portViews

protected transient CellView[] portViews

targetGroup

protected transient CellView targetGroup

ignoreTargetGroup

protected transient CellView ignoreTargetGroup

cachedBounds

protected transient Rectangle2D cachedBounds

initialLocation

protected transient Point2D initialLocation

handles

protected transient CellHandle[] handles

start

protected transient Point2D start

last

protected transient Point2D last

snapStart

protected transient Point2D snapStart

snapLast

protected transient Point2D snapLast

offgraphics

protected transient Graphics offgraphics

Reference to graph off screen graphics

isMoving

protected boolean isMoving

Indicates whether this handle is currently moving cells. Start may be non-null and isMoving false while the minimum movement has not been reached.

isDragging

protected boolean isDragging

Indicates whether this handle has started drag and drop. Note: isDragging => isMoving.

activeHandle

protected transient CellHandle activeHandle

The handle that consumed the last mousePressedEvent. Initially null.

context

protected transient GraphContext context

isContextVisible

protected boolean isContextVisible

blockPaint

protected boolean blockPaint

current

protected Point2D current

disconnect

protected transient ConnectionSet disconnect

Constructor Detail

BasicGraphUI.RootHandle

public BasicGraphUI.RootHandle(GraphContext ctx)

Creates a root handle which contains handles for the given cells. The root handle and all its childs point to the specified JGraph instance. The root handle is responsible for dragging the selection.

Method Detail

getInitialLocation

protected Point2D getInitialLocation(Object[] cells)

Returns the initial location, which is the top left corner of the selection, ignoring all connected endpoints of edges.

getContext

public GraphContext getContext()

paint

public void paint(Graphics g)

Description copied from interface: CellHandle

Paint the handle on the given graphics object once.

Specified by:

paint in interface CellHandle

Parameters:

g - the graphics object to paint the handle on

overlay

public void overlay(Graphics g)

Description copied from interface: CellHandle

Paint the handle on the given graphics object during mouse operations.

Specified by:

overlay in interface CellHandle

Parameters:

g - the graphics object to paint the handle on

mouseMoved

public void mouseMoved(MouseEvent event)

Invoked when the mouse pointer has been moved on a component (with no buttons down).

Specified by:

mouseMoved in interface CellHandle

Parameters:

event - the mouse event to be processed

mousePressed

public void mousePressed(MouseEvent event)

Description copied from interface: CellHandle

Messaged when a mouse button is pressed.

Specified by:

mousePressed in interface CellHandle

Parameters:

event - the mouse event to be processed

findViewForPoint

protected CellView findViewForPoint(Point2D pt)

Hook for subclassers to return a different view for a mouse click at pt. For example, this can be used to return a leaf cell instead of a group.

findUnselectedInnermostGroup

protected CellView findUnselectedInnermostGroup(double x,
                                                double y)

Used for move into group to find the target group.

startDragging

protected void startDragging(MouseEvent event)

getFirstOpaqueParent

public Component getFirstOpaqueParent(Component component)

Returns:

Returns the parent graph scrollpane for the specified graph.

initOffscreen

protected void initOffscreen()

mouseDragged

public void mouseDragged(MouseEvent event)

Process mouse dragged event.

Specified by:

mouseDragged in interface CellHandle

Parameters:

event - the drag event to be processed

constrainDrag

protected Point2D constrainDrag(MouseEvent event,
                                double totDx,
                                double totDy,
                                double dx,
                                double dy)

Hook method to constrain a mouse drag

Parameters:

event -

totDx -

totDy -

dx -

dy -

Returns:

a point describing any position constraining applied

mouseReleased

public void mouseReleased(MouseEvent event)

Description copied from interface: CellHandle

Messaged when the drag operation has terminated with a drop.

Specified by:

mouseReleased in interface CellHandle

Parameters:

event - the drop event to be processed