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org.eclipse.core.commands.operations
Class LinearUndoEnforcer
java.lang.Object
org.eclipse.core.commands.operations.LinearUndoViolationDetector
org.eclipse.core.commands.operations.LinearUndoEnforcer
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All Implemented Interfaces:
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IOperationApprover
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public final class LinearUndoEnforcer
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LinearUndoViolationDetector
An operation approver that enforces a strict linear undo. It does not allow
the undo or redo of any operation that is not the latest available operation
in all of its undo contexts. This class may be instantiated by clients.
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Since:
- 3.1
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Methods inherited from class java.lang.
Object
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clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait
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LinearUndoEnforcer
public LinearUndoEnforcer()
- Create an instance of LinearUndoEnforcer.
allowLinearRedoViolation
protected
IStatus allowLinearRedoViolation(
IUndoableOperation operation,
IUndoContext context,
IOperationHistory history,
IAdaptable uiInfo)
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Description copied from class:
LinearUndoViolationDetector
- Return a status indicating whether a linear redo violation is allowable.
A linear redo violation is defined as a request to redo a particular
operation even if it is not the most recently added operation to the redo
history.
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Specified by:
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allowLinearRedoViolation
in class
LinearUndoViolationDetector
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Parameters:
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operation - the operation for which a linear redo violation has been
detected. -
context - the undo context in which the linear redo violation exists -
history - the operation history containing the operation -
uiInfo - the IAdaptable (or null) provided by the
caller in order to supply UI information for prompting the
user if necessary. When this parameter is not
null, it should minimally contain an adapter
for the org.eclipse.swt.widgets.Shell.class.
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Returns:
- the IStatus describing whether the redo violation is allowed. The
redo will not proceed if the status severity is not
OK, and the caller requesting the redo will be
returned the status that caused the rejection. Specific status
severities will not be interpreted by the history.
allowLinearUndoViolation
protected
IStatus allowLinearUndoViolation(
IUndoableOperation operation,
IUndoContext context,
IOperationHistory history,
IAdaptable uiInfo)
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Description copied from class:
LinearUndoViolationDetector
- Return a status indicating whether a linear undo violation is allowable.
A linear undo violation is defined as a request to undo a particular
operation even if it is not the most recently added operation to the undo
history.
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Specified by:
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allowLinearUndoViolation
in class
LinearUndoViolationDetector
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Parameters:
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operation - the operation for which a linear undo violation has been
detected. -
context - the undo context in which the linear undo violation exists -
history - the operation history containing the operation -
uiInfo - the IAdaptable (or null) provided by the
caller in order to supply UI information for prompting the
user if necessary. When this parameter is not
null, it should minimally contain an adapter
for the org.eclipse.swt.widgets.Shell.class.
-
Returns:
- the IStatus describing whether the undo violation is allowed. The
undo will not proceed if the status severity is not
OK, and the caller requesting the undo will be
returned the status that caused the rejection. Specific status
severities will not be interpreted by the history.
Guidelines for using Eclipse APIs.
Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.
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