Hybrid Undo Redo System Dynamic Regions
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Solution Overview
Problem
Conventional undo operations in text editing applications are limited to linear undo, where only the last edit can be easily undone and redone, restricting the ability to undo edits in arbitrary order across dynamic regions in a document.
Innovation Solution
Implementing a hybrid undo/redo system that uses dynamic regions with start, end, and offset values to define areas within a document, allowing non-linear undo and redo operations by adjusting these values based on line additions or deletions, and pushing records onto stacks to enable modifications to be undone or redone across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional linear undo operations are implemented, then the system is simple to implement, but the user cannot undo edits in arbitrary order across dynamic regions
Solution Approach 1:
The patent divides the document into multiple dynamic regions, each with its own undo stack. This segmentation allows independent undo operations within each region while maintaining overall system coherence. The region data structure includes start value, end value, and offset value to define boundaries, enabling granular control over undo operations across different document sections.
Solution Approach 2:
The patent introduces a regional dimension to the traditional linear undo stack by organizing undo records into region-specific stacks. Each region maintains its own stack of modification records, allowing users to navigate and undo operations across multiple regions in non-linear fashion. This dimensional organization transforms the single-dimensional linear undo into a multi-dimensional undo system.
2Adaptability or versatility
If dynamic regions with adjustable start, end, and offset values are implemented, then non-linear undo operations are enabled, but the data structure complexity increases
Solution Approach 1:
The patent applies local quality by giving each dynamic region its own specific data structure with start value, end value, and offset value tailored to its needs. Each region's undo stack is customized to track modifications within that specific region, allowing the system to handle different region requirements with appropriate local data structures rather than a uniform approach.
Solution Approach 2:
The patent implements nesting by placing undo stacks within region data structures, which are themselves nested within the broader document structure. Each region contains its own undo stack, and regions are organized within the document hierarchy. This nested organization allows efficient access to region-specific undo operations while maintaining the overall document structure.
3Measurement precision
If region offset values are adjusted based on line additions or deletions, then region positioning accuracy is maintained, but the computational overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing offset values for each dynamic region. When lines are added or deleted, the system proactively updates the offset values of affected regions before the user performs any operations. This preliminary adjustment ensures that region positioning remains accurate without requiring complex real-time calculations during user interactions.
Solution Approach 2:
The patent implements feedback mechanisms by monitoring line additions and deletions and automatically adjusting region offset values in response. The system continuously tracks document structure changes and provides feedback by updating region definitions to maintain accurate positioning. This feedback loop ensures region integrity while automating the adjustment process to minimize manual intervention.
Data Source
AI summary
Techniques are disclosed for a hybrid undo/redo for text editing, where non-linear undo and redo operations are performed across dynamic regions in a document and linear undo and redo operations are performed within the dynamic regions in the document. In an example, the hybrid undo/redo may be achieved by maintaining respective region offset values for the dynamic regions created in a document by the edits made to the document. In operation, the respective region offset values associated with the dynamic regions can be used to negate or otherwise counteract the effect of edits made in the dynamic regions.