org.jhotdraw.draw.tool

Class SelectionTool

java.lang.Object

org.jhotdraw.beans.AbstractBean

org.jhotdraw.draw.tool.AbstractTool

org.jhotdraw.draw.tool.SelectionTool

All Implemented Interfaces:

java.awt.event.KeyListener, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, Tool

Direct Known Subclasses:

DelegationSelectionTool

public class SelectionTool
extends AbstractTool

Tool to select and manipulate figures.

A selection tool is in one of three states: 1) area selection, 2) figure dragging, 3) handle manipulation. The different states are handled by different tracker objects: the DefaultSelectAreaTracker, the DefaultDragTracker and the DefaultHandleTracker.

A Figure can be selected by clicking at it. Holding the alt key or the ctrl key down, selects the Figure behind it.

Design Patterns

Strategy
The different behavior states of the selection tool are implemented by trackers.
Context: SelectionTool; State: DragTracker, HandleTracker, SelectAreaTracker.

Chain of responsibility
Mouse and keyboard events of the user occur on the drawing view, and are preprocessed by the DragTracker of a SelectionTool. In turn DragTracker invokes "track" methods on a Handle which in turn changes an aspect of a figure.
Client: SelectionTool; Handler: DragTracker, Handle.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	SELECT_BEHIND_ENABLED_PROPERTY Constant for the name of the selectBehindEnabled property.

Fields inherited from class org.jhotdraw.draw.tool.AbstractTool

anchor, editor, isWorking, listenerList

Fields inherited from class org.jhotdraw.beans.AbstractBean

propertySupport

Constructor Summary

Constructors

Constructor and Description
SelectionTool() Creates a new instance.

Method Summary

Modifier and Type	Method and Description
void	activate(DrawingEditor editor) Activates the tool for the given editor.
void	deactivate(DrawingEditor editor) Deactivates the tool.
void	draw(java.awt.Graphics2D g) Draws the tool.
protected DragTracker	getDragTracker(Figure f) Method to get a DragTracker which handles user interaction for dragging the specified figure.
protected HandleTracker	getHandleTracker(Handle handle) Method to get a HandleTracker which handles user interaction for the specified handle.
protected SelectAreaTracker	getSelectAreaTracker() Method to get a SelectAreaTracker which handles user interaction for selecting an area on the drawing.
boolean	isSelectBehindEnabled() Returns the value of the selectBehindEnabled property.
void	keyPressed(java.awt.event.KeyEvent e) The Tool uses the InputMap to determine what to do, when a key is pressed.
void	keyReleased(java.awt.event.KeyEvent evt)
void	keyTyped(java.awt.event.KeyEvent evt)
void	mouseClicked(java.awt.event.MouseEvent evt)
void	mouseDragged(java.awt.event.MouseEvent evt)
void	mouseEntered(java.awt.event.MouseEvent evt)
void	mouseExited(java.awt.event.MouseEvent evt)
void	mouseMoved(java.awt.event.MouseEvent evt)
void	mousePressed(java.awt.event.MouseEvent evt)
void	mouseReleased(java.awt.event.MouseEvent evt)
void	setDragTracker(DragTracker newValue) Method to set a DragTracker.
void	setHandleTracker(HandleTracker newValue) Method to set a HandleTracker.
void	setSelectAreaTracker(SelectAreaTracker newValue) Method to set a SelectAreaTracker.
void	setSelectBehindEnabled(boolean newValue) Sets the selectBehindEnabled property.
protected void	setTracker(Tool newTracker)
boolean	supportsHandleInteraction() Returns true, if this tool lets the user interact with handles.

Methods inherited from class org.jhotdraw.draw.tool.AbstractTool

addToolListener, addUndoableEditListener, constrainPoint, constrainPoint, createActionMap, createInputMap, editCopy, editCut, editDelete, editDuplicate, editPaste, fireAreaInvalidated, fireAreaInvalidated, fireBoundsInvalidated, fireToolDone, fireToolStarted, getActionMap, getDrawing, getEditor, getInputMap, getToolTipText, getView, isActive, maybeFireBoundsInvalidated, removeToolListener, removeUndoableEditListener, setActionMap, setInputMap, updateCursor, viewToDrawing

Methods inherited from class org.jhotdraw.beans.AbstractBean

addPropertyChangeListener, addPropertyChangeListener, clone, firePropertyChange, firePropertyChange, firePropertyChange, getPropertyChangeListeners, removePropertyChangeListener, removePropertyChangeListener

Methods inherited from class java.lang.Object

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

Field Detail

SELECT_BEHIND_ENABLED_PROPERTY

public static final java.lang.String SELECT_BEHIND_ENABLED_PROPERTY

Constant for the name of the selectBehindEnabled property.

See Also:

Constant Field Values

Constructor Detail

SelectionTool

public SelectionTool()

Creates a new instance.

Method Detail

setSelectBehindEnabled

public void setSelectBehindEnabled(boolean newValue)

Sets the selectBehindEnabled property. This is a bound property.

Parameters:

newValue - The new value.

isSelectBehindEnabled

public boolean isSelectBehindEnabled()

Returns the value of the selectBehindEnabled property. This is a bound property.

Returns:

The property value.

activate

public void activate(DrawingEditor editor)

Description copied from interface: Tool

Activates the tool for the given editor. This method is called whenever the user switches to this tool.

Specified by:

activate in interface Tool

Overrides:

activate in class AbstractTool

deactivate

public void deactivate(DrawingEditor editor)

Description copied from interface: Tool

Deactivates the tool. This method is called whenever the user switches to another tool.

Specified by:

deactivate in interface Tool

Overrides:

deactivate in class AbstractTool

keyPressed

public void keyPressed(java.awt.event.KeyEvent e)

Description copied from class: AbstractTool

The Tool uses the InputMap to determine what to do, when a key is pressed. If the corresponding value of the InputMap is a String, the ActionMap of the tool is used, to find the action to be performed. If the corresponding value of the InputMap is a ActionListener, the actionPerformed method of the ActionListener is performed.

Specified by:

keyPressed in interface java.awt.event.KeyListener

Overrides:

keyPressed in class AbstractTool

keyReleased

public void keyReleased(java.awt.event.KeyEvent evt)

Specified by:

keyReleased in interface java.awt.event.KeyListener

Overrides:

keyReleased in class AbstractTool

keyTyped

public void keyTyped(java.awt.event.KeyEvent evt)

Specified by:

keyTyped in interface java.awt.event.KeyListener

Overrides:

keyTyped in class AbstractTool

mouseClicked

public void mouseClicked(java.awt.event.MouseEvent evt)

Specified by:

mouseClicked in interface java.awt.event.MouseListener

Overrides:

mouseClicked in class AbstractTool

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent evt)

mouseEntered

public void mouseEntered(java.awt.event.MouseEvent evt)

Specified by:

mouseEntered in interface java.awt.event.MouseListener

Overrides:

mouseEntered in class AbstractTool

mouseExited

public void mouseExited(java.awt.event.MouseEvent evt)

Specified by:

mouseExited in interface java.awt.event.MouseListener

Overrides:

mouseExited in class AbstractTool

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent evt)

Specified by:

mouseMoved in interface java.awt.event.MouseMotionListener

Overrides:

mouseMoved in class AbstractTool

mouseReleased

public void mouseReleased(java.awt.event.MouseEvent evt)

Specified by:

mouseReleased in interface java.awt.event.MouseListener

Overrides:

mouseReleased in class AbstractTool

draw

public void draw(java.awt.Graphics2D g)

Description copied from interface: Tool

Draws the tool.

Specified by:

draw in interface Tool

Overrides:

draw in class AbstractTool

mousePressed

public void mousePressed(java.awt.event.MouseEvent evt)

Specified by:

mousePressed in interface java.awt.event.MouseListener

Overrides:

mousePressed in class AbstractTool

setTracker

protected void setTracker(Tool newTracker)

getHandleTracker

protected HandleTracker getHandleTracker(Handle handle)

Method to get a HandleTracker which handles user interaction for the specified handle.

getDragTracker

protected DragTracker getDragTracker(Figure f)

Method to get a DragTracker which handles user interaction for dragging the specified figure.

getSelectAreaTracker

protected SelectAreaTracker getSelectAreaTracker()

Method to get a SelectAreaTracker which handles user interaction for selecting an area on the drawing.

setHandleTracker

public void setHandleTracker(HandleTracker newValue)

Method to set a HandleTracker. If you specify null, the SelectionTool uses the DefaultHandleTracker.

setSelectAreaTracker

public void setSelectAreaTracker(SelectAreaTracker newValue)

Method to set a SelectAreaTracker. If you specify null, the SelectionTool uses the DefaultSelectAreaTracker.

setDragTracker

public void setDragTracker(DragTracker newValue)

Method to set a DragTracker. If you specify null, the SelectionTool uses the DefaultDragTracker.

supportsHandleInteraction

public boolean supportsHandleInteraction()

Returns true, if this tool lets the user interact with handles.

Handles may draw differently, if interaction is not possible.

Specified by:

supportsHandleInteraction in interface Tool

Overrides:

supportsHandleInteraction in class AbstractTool

Returns:

True, if this tool supports interaction with the handles.