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GraphFlow is a node-based graph editor built with Qt/QML and C++. It allows you to visually create, connect, and manage computational flows using a flexible, interactive UI. This is an early version providing core graph editing features, with extensibility for custom node types and logic.

• Node-Based Graph Editing

  • Drag-and-drop nodes from a searchable sidebar.
  • Connect nodes with cables to represent data or logic flow.
  • Select, move, and delete nodes individually or in groups.
  • Zoom and pan the graph canvas for large flows.

• Custom Node Types

  • Node definitions loaded from JSON (ui/data/nodes.json).
  • Extendable library with attributes, icons, and colors.
  • Example node types: Input, Add, Multiply, Threshold, Output.

• Interactive UI

  • Modern UI with smooth selection, snapping, and multi-selection rectangle.
  • Visual feedback for connections, selection, and actions.
  • Sidebar node list with live filtering/search.

• Persistence

  • Automatically saves graph state to lastFlow.json.
  • Reloads previous graph on startup.

• Code Structure & Extensibility

  • C++ Models: FlowNodeModel, FlowLinkModel, NodeLibraryModel for data management.
  • GraphController: Glue for node/link operations, selection, and serialization.
  • QML Components: Modular files for nodes, attributes, links, scene, and controls.
  • Pre-commit Hooks: Code quality enforced for C++, CMake, QML, JSON, etc.

1. Build the Project

   • Requires Qt 6.4+ and C++17.
   • Use CMake:

     mkdir build && cd build
     cmake ..
     make

2. Run the Application

   • Launch the built binary (GraphFlow).
   • The main window opens with the graph editor and node sidebar.

3. Usage

   • Add Nodes: Browse or search in the left sidebar; click to add to the graph.
   • Edit Graph: Drag to move nodes, drag sockets to connect with cables, select multiple nodes with a rectangle, delete with Del.
   • Save/Load: Graph state is auto-saved/loaded in lastFlow.json.

GraphFlow/
├── src/
│   ├── FlowNodeModel.*         # Node data model
│   ├── LinkModel.*             # Link/connection model
│   ├── GraphController.*       # Main graph logic
│   ├── NodeLibraryModel.*      # Node type definitions (JSON)
│   └── main.cpp
├── ui/
│   ├── Main.qml                # Main window
│   ├── GraphFlowItem/          # Node, Link, Cable, etc. QML components
│   ├── NodeList.qml            # Sidebar node library
│   ├── Theme.qml               # Color palette and theming
│   ├── data/
│   │   ├── nodes.json          # Example node definitions
│   │   └── icons/              # SVG icons for node types
│   └── qmldir
├── CMakeLists.txt
├── .pre-commit-config.yaml     # Code style and linting setup
├── .clang-format               # C++ formatting
├── .cmake-format.yaml
├── .qmlformat.ini
└── .gitignore

• Add Node Types: Edit or add to ui/data/nodes.json (see included examples).
• Custom Logic: Extend GraphController and node models in C++.
• UI Customization: Modify QML components for new visuals or interactions.

• Node execution logic and data flow (currently not implemented).
• More node types and better extensibility.
• Undo/redo, import/export, and advanced editing features.
• Unit tests and documentation.

GraphFlow is in early development. Contributions and feedback are welcome!