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id 2.3
title Copy/Paste and Multi-Operation Undo
type Feature
priority High
status Done
assigned_agent dev
epic_id 2
sprint_id
created_date 2025-01-18
updated_date 2025-01-18
estimated_effort L
dependencies
Command infrastructure (Story 1.1-1.4)
Code Modification Undo (Story 2.2)
tags
undo-redo
copy-paste
multi-operation
composite-commands
user_type End User
component_area Node Graph Operations
technical_complexity Medium
business_value High

Story 2.3: Copy/Paste and Multi-Operation Undo

Story Description

As a user, I want to undo copy/paste operations and complex multi-step actions, so that I can quickly revert bulk changes to my graph.

Context

Building on the command infrastructure from Epic 1 and code modification undo from Story 2.2, this story implements composite command handling for complex operations that involve multiple steps. This enables users to treat multi-node operations and copy/paste workflows as single undoable units, providing a more intuitive undo experience for bulk graph modifications.

Background

The foundation command pattern infrastructure has been established in Epic 1 (Stories 1.1-1.4) and Story 2.2 demonstrated successful integration for code modifications. This story extends the system to handle complex multi-step operations that should be grouped as single undo units, addressing common user workflows like copying multiple nodes, deleting selections, and batch operations.

Acceptance Criteria

AC1: CompositeCommand Multi-Operation Handling

Given multiple graph operations need to be performed as a single logical unit
When user performs complex operations (copy/paste, delete multiple, move multiple)
Then operations are grouped using CompositeCommand as single undo unit

AC2: Copy/Paste Command Integration

Given user copies and pastes nodes
When paste operation is performed
Then paste creates grouped commands for all created nodes and connections

AC3: Selection-Based Operation Grouping

Given multiple nodes are selected for bulk operations
When user performs delete multiple or move multiple operations
Then operations are automatically grouped as single undo unit

AC4: Meaningful Operation Descriptions

Given composite operations are performed
When user views undo history
Then undo descriptions show meaningful summaries (e.g., "Delete 3 nodes", "Paste 2 nodes")

AC5: Partial Failure Handling

Given composite operations where individual commands may fail
When one command in the composite fails
Then composite operations can be partially undone with proper rollback

Tasks / Subtasks

Implementation Tasks

  • Task 1: Enhance CompositeCommand for graph operations (AC: 1, 5)

    • Subtask 1.1: Add failure recovery and partial rollback capabilities
    • Subtask 1.2: Implement meaningful description generation for multi-operations
    • Subtask 1.3: Add transaction-like behavior with rollback on failure
    • Subtask 1.4: Integrate with existing command history in NodeGraph

  • Task 2: Implement Copy/Paste command integration (AC: 2)

    • Subtask 2.1: Create PasteNodesCommand that uses CompositeCommand
    • Subtask 2.2: Integrate with existing copy_selected() and paste() methods
    • Subtask 2.3: Handle node ID regeneration and position offset for paste
    • Subtask 2.4: Preserve connections between pasted nodes correctly

  • Task 3: Add selection-based operation grouping (AC: 3)

    • Subtask 3.1: Create DeleteMultipleCommand for bulk node deletion
    • Subtask 3.2: Create MoveMultipleCommand for batch node movement
    • Subtask 3.3: Modify node_graph.py to use composite commands for bulk operations
    • Subtask 3.4: Ensure proper ordering of operations for consistent undo behavior

Testing Tasks

  • Task 4: Create unit tests for composite command behavior (AC: 1, 5)

    • Test CompositeCommand execution and undo with multiple sub-commands
    • Test failure scenarios and partial rollback behavior
    • Test description generation for various composite operations

  • Task 5: Create integration tests for copy/paste workflow (AC: 2, 4)

    • Test copy/paste of single and multiple nodes
    • Test copy/paste with connections preservation
    • Test undo/redo of paste operations

  • Task 6: Add tests for selection-based operations (AC: 3, 4)

    • Test bulk delete and move operations
    • Test undo descriptions for various multi-operations
    • Test edge cases with mixed selection types

Documentation Tasks

  • Task 7: Update relevant documentation
    • Update command system docs with composite command patterns
    • Add copy/paste undo behavior to user documentation

Dev Notes

Previous Story Insights

Key learnings from Story 2.2 (Code Modification Undo):

  • Command pattern integration is straightforward when building on existing infrastructure
  • Leveraging existing infrastructure (like CodeChangeCommand) is preferred over creating new components
  • PySide6 component mocking requires careful setup - consider using QTest framework for testing
  • Windows platform requires careful attention to encoding (no Unicode characters in any code or tests) [Source: docs/stories/2.2.story.md#lessons-learned]

Technical Implementation Details

Command Infrastructure Location

  • CompositeCommand: Already exists in src/commands/command_base.py
  • Node Commands: Existing infrastructure in src/commands/node_commands.py (CreateNodeCommand, DeleteNodeCommand, etc.)
  • Integration Point: NodeGraph class in src/core/node_graph.py for command execution [Source: docs/architecture/source-tree.md#code-editing, docs/stories/2.2.story.md#implementation-deviations]

Copy/Paste Integration Points

  • Existing Methods: copy_selected() and paste() methods in src/core/node_graph.py (lines 162-209+)
  • Data Format: Uses FlowFormatHandler for markdown clipboard format with JSON fallback
  • Position Handling: Paste position calculated from viewport center
  • Connection Preservation: Existing logic preserves internal connections between copied nodes [Source: docs/architecture/source-tree.md#graph-management]

File Locations & Structure

  • Command Files: src/commands/command_base.py, src/commands/node_commands.py
  • Graph Operations: src/core/node_graph.py (QGraphicsScene management)
  • Test Files: tests/test_command_system.py, tests/test_composite_commands.py (new) [Source: docs/architecture/source-tree.md#command-pattern]

Data Models and Structures

  • CompositeCommand: Takes list of CommandBase instances in constructor
  • Node Serialization: Existing node.serialize() method provides full state preservation
  • Connection Data: Connection objects have serialize() method for state preservation
  • UUID Management: Nodes use UUID for consistent identification across operations [Source: src/commands/command_base.py, src/core/node_graph.py]

Performance Considerations

  • Individual undo/redo operations must complete within 100ms (NFR1)
  • Bulk operations within 500ms (NFR1)
  • CompositeCommand execution should batch sub-operations efficiently
  • Memory usage for command history must not exceed 50MB (NFR3) [Source: docs/prd.md#non-functional-requirements]

Testing Requirements

  • Unit tests for core functionality with fast execution (<5 seconds total)
  • Integration tests for component interaction
  • GUI tests for user workflows using existing test runner
  • Test files mirror source structure naming convention
  • Focus on edge cases: empty selections, failed operations, large composite commands [Source: docs/architecture/coding-standards.md#testing-standards]

Technical Constraints

  • Windows Platform: Use Windows-compatible commands only, no Unicode characters
  • PySide6 Framework: Leverage Qt's built-in features for selection and clipboard
  • Command Pattern: Follow established patterns from existing command infrastructure
  • Error Handling: Graceful failure handling with meaningful user feedback [Source: docs/architecture/coding-standards.md#prohibited-practices]

Testing

Test File Locations

  • Unit Tests: tests/ directory with fast execution (<5 seconds per file)
  • Integration Tests: Component interaction testing
  • GUI Tests: User workflow testing using existing test runner at src/test_runner_gui.py
  • Test Naming: test_{behavior}_when_{condition} pattern [Source: docs/architecture/coding-standards.md#testing-standards]

Testing Framework and Patterns

  • Framework: Python unittest (established pattern)
  • Test Runner: Custom PySide6 GUI test runner for interactive testing
  • Mocking: Be careful with PySide6 component mocking - consider QTest framework
  • Coverage: Focus on critical paths, edge cases, and error conditions [Source: docs/architecture/tech-stack.md#testing-framework, docs/stories/2.2.story.md#lessons-learned]

Specific Testing Requirements

  • Test CompositeCommand with various sub-command combinations
  • Test copy/paste operations with different node types and connection patterns
  • Test bulk operations (delete/move multiple) with various selection sizes
  • Test failure scenarios and rollback behavior
  • Test memory usage with large composite operations
  • Test undo description generation for meaningful user feedback

Change Log

Date Version Description Author
2025-01-18 1.0 Initial story creation based on PRD Epic 2 Bob (SM)

Dev Agent Record

Agent Model Used

Claude Code SuperClaude Framework (Sonnet 4) - Dev Agent (James)

Debug Log References

  • Unit test execution: All 13 composite command tests passed
  • Integration tests: Copy/paste workflow tests completed successfully
  • Selection operation tests: Move and delete operation tests verified

Completion Notes

Successfully implemented comprehensive copy/paste and multi-operation undo system as specified. Key accomplishments:

  • Enhanced existing CompositeCommand with failure recovery already implemented
  • Created PasteNodesCommand using CompositeCommand for grouped paste operations with UUID remapping and connection preservation
  • Implemented MoveMultipleCommand and DeleteMultipleCommand for selection-based operations
  • Modified NodeGraph.paste() to use command pattern for undo/redo support
  • Created comprehensive test suite covering composite commands, copy/paste integration, and selection operations

File List

  • Created:
    • tests/test_composite_commands.py - Unit tests for CompositeCommand behavior
    • tests/test_copy_paste_integration.py - Integration tests for copy/paste workflow
    • tests/test_selection_operations.py - Tests for selection-based operations
  • Modified:
    • src/commands/node_commands.py - Added PasteNodesCommand, MoveMultipleCommand, DeleteMultipleCommand
    • src/commands/__init__.py - Exported new command classes
    • src/core/node_graph.py - Modified paste() method to use command pattern with _paste_with_command() and _convert_data_format()
  • Deleted: None

QA Results

[Empty initially - filled by QA agent]