org.jhotdraw.draw.action

Class AbstractDrawingEditorAction

java.lang.Object

javax.swing.AbstractAction

org.jhotdraw.draw.action.AbstractDrawingEditorAction

All Implemented Interfaces:

java.awt.event.ActionListener, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, javax.swing.Action

Direct Known Subclasses:

ZoomEditorAction

public abstract class AbstractDrawingEditorAction
extends javax.swing.AbstractAction

This abstract class can be extended to implement an Action that acts on behalf of a DrawingEditor.

By default the enabled state of this action reflects the enabled state of the DrawingEditor. When many actions listen to the enabled state of the drawing editor this can considerably slow down the editor. If updating the enabled state is not necessary, you can prevent the action from doing so using setUpdateEnabledState(boolean).

AbstractDrawingEditorAction listens using a WeakPropertyChangeListener on the DrawingEditor and thus may become garbage collected if it is not referenced by any other object.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected DrawingEditor	editor

Fields inherited from class javax.swing.AbstractAction

changeSupport, enabled

Fields inherited from interface javax.swing.Action

ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, DISPLAYED_MNEMONIC_INDEX_KEY, LARGE_ICON_KEY, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SELECTED_KEY, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

Constructors

Constructor and Description
AbstractDrawingEditorAction(DrawingEditor editor) Creates a new instance.

Method Summary

Modifier and Type	Method and Description
protected void	fireUndoableEditHappened(javax.swing.undo.UndoableEdit edit) Updates the enabled state of this action to reflect the enabled state of the active DrawingView.
protected Drawing	getDrawing()
DrawingEditor	getEditor()
protected DrawingView	getView()
boolean	isUpdatEnabledState() Returns true, if this action automatically updates its enabled state to reflect the enabled state of the active DrawingView.
void	setEditor(DrawingEditor newValue)
void	setUpdateEnabledState(boolean newValue) By default, the enabled state of this action is updated to reflect the enabled state of the active DrawingView.
protected void	updateEnabledState()

Methods inherited from class javax.swing.AbstractAction

addPropertyChangeListener, clone, firePropertyChange, getKeys, getPropertyChangeListeners, getValue, isEnabled, putValue, removePropertyChangeListener, setEnabled

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.awt.event.ActionListener

actionPerformed

Field Detail

editor

protected DrawingEditor editor

Constructor Detail

AbstractDrawingEditorAction

public AbstractDrawingEditorAction(DrawingEditor editor)

Creates a new instance.

Method Detail

setEditor

public void setEditor(DrawingEditor newValue)

updateEnabledState

protected void updateEnabledState()

getEditor

public DrawingEditor getEditor()

getView

protected DrawingView getView()

getDrawing

protected Drawing getDrawing()

fireUndoableEditHappened

protected void fireUndoableEditHappened(javax.swing.undo.UndoableEdit edit)

Updates the enabled state of this action to reflect the enabled state of the active DrawingView. If no drawing view is active, this action is disabled.

setUpdateEnabledState

public void setUpdateEnabledState(boolean newValue)

By default, the enabled state of this action is updated to reflect the enabled state of the active DrawingView. Since this is not always necessary, and since many listening actions may considerably slow down the drawing editor, you can switch this behavior off here.

Parameters:

newValue - Specify false to prevent automatic updating of the enabled state.

isUpdatEnabledState

public boolean isUpdatEnabledState()

Returns true, if this action automatically updates its enabled state to reflect the enabled state of the active DrawingView.