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UC Berkeley Group for User Interface Research Updated November 17, 2000 |
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java.lang.Object | +--edu.berkeley.guir.lib.satin.command.CommandImpl | +--edu.berkeley.guir.lib.satin.command.UndoableCommand
Undoable commands are commands that are meant to be undone only. This is more in spirit with how undo was designed in Java Swing. It assumes that the programmer has already "done" the action, and just wants some way of undoing what they did.
To use this class, subclass it and override the undo method to undo what you want. Just be sure to throw this command into the command queue in the right place, so it can be undone sequentially in the right order.
This software is distributed under the Berkeley Software License.
Revisions: - SATIN-v1.0-1.0.0, Aug 31 1999, JH Created class - SATIN-v2.1-1.0.0, Aug 11 2000, JH Touched for SATIN release
Inner classes inherited from class edu.berkeley.guir.lib.satin.SatinConstants |
SatinConstants.ObjectPoolAffineTransform, SatinConstants.ObjectPoolPoint2D, SatinConstants.ObjectPoolPolygon2D, SatinConstants.ObjectPoolRectangle2D, SatinConstants.ObjectPoolStringBuffer, SatinConstants.UniqueAffineTransform, SatinConstants.UniquePoint2D, SatinConstants.UniquePolygon2D, SatinConstants.UniqueRectangle2D |
Constructor Summary | |
UndoableCommand()
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Method Summary | |
boolean |
canRedo()
Override this method in the subclass. |
boolean |
canUndo()
Override this method in the subclass. |
void |
die()
Override this method in the subclass. |
String |
getPresentationName()
Override this method in the subclass. |
boolean |
isSignificant()
Override this method in the subclass. |
void |
redo()
Obviously we cannot redo, since we don't know what to do in the first place. |
void |
run()
By default, does nothing. |
void |
undo()
Override this method in the subclass. |
Methods inherited from class edu.berkeley.guir.lib.satin.command.CommandImpl |
addEdit, debug, disable, enable, execute, getExecutionTime, getRedoPresentationName, getUndoPresentationName, isDisabled, isEnabled, replaceEdit, setExecutionTime, setExecutionTime, toString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public UndoableCommand()
Method Detail |
public String getPresentationName()
CommandImpl
getPresentationName
in class CommandImpl
public boolean canRedo()
CommandImpl
canRedo
in class CommandImpl
public boolean canUndo()
CommandImpl
canUndo
in class CommandImpl
public boolean isSignificant()
CommandImpl
isSignificant
in class CommandImpl
public void run()
run
in class CommandImpl
public void redo()
redo
in class CommandImpl
public void undo()
CommandImpl
undo
in class CommandImpl
public void die()
CommandImpl
die
in class CommandImpl
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