| 摘要 |
A graphical undo/redo manager provides a graphical indication of multiple tasks that were recently performed. A user may undo multiple tasks in one step by selecting a task the user wishes to revert to, and the graphical undo/redo manager then undoes all the commands that were done subsequent to the selected task, taking the computer program to a desired state in only one user operation. In similar fashion, a user may redo multiple tasks in one step by clicking on a selected subsequent task (that was previously undone) that the user wishes to go forward to, and the graphical undo/redo manager then redoes all the commands between the last undo and the selected task, including the selected task. In addition, the graphical undo/redo manager provides for collapsing multiple tasks into a marker, either automatically when certain commands are executed in the computer program or upon command by a user for future reference.
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