GoFlow Dev Branch - Current Status

Last Updated: 2025-11-16 Branch: dev Latest Commit: Merge macOS native rendering backend

🎉 Major Milestone: First Working Renderer!

GoFlow now has a working native macOS rendering backend using Core Graphics and Cocoa!

📊 Project Overview

Directory Structure

GoFlow/
├── pkg/                          # Core packages (Go convention)
│   ├── core/
│   │   ├── framework/            # Framework core (renamed from goflow/)
│   │   ├── signals/              # Reactive state management
│   │   └── widgets/              # Base widgets
│   └── ui/
│       ├── adaptive/             # Platform-adaptive widgets
│       ├── material/             # Material Design
│       └── cupertino/            # iOS/macOS Cupertino
├── backends/                     # ✨ NEW: Native rendering backends
│   └── macos/                    # macOS Core Graphics backend
├── cmd/goflow/                   # CLI tool
├── docs/                         # Documentation
└── examples/                     # Example applications
    └── rendering-demo/           # ✨ NEW: Rendering demonstration

🆕 What's New: macOS Rendering Backend

Backend Implementation (`backends/macos/`)

Total: ~1,321 lines of code

Go Files

canvas_macos.go (197 lines) - Canvas interface implementation
- DrawRect (filled and stroked)
- DrawCircle (filled and stroked)
- DrawLine
- DrawText with Core Text
- Canvas transformations (translate, scale, rotate)
- Save/restore state
- Clipping rectangles
window_macos.go (312 lines) - Window management
- Window creation and destruction
- Event loop
- Resize callbacks
- Draw callbacks
- Thread-safe window registry

Objective-C Bridge Files

cgo_bridge.h/m (391 lines) - Core Graphics bridging
- Graphics context creation
- Drawing primitives
- Text rendering with Core Text
- Color and transformation handling
window_bridge.h/m (421 lines) - Cocoa window bridging
- NSWindow creation and management
- NSView for rendering
- Event handling infrastructure
- Display synchronization

Features Implemented ✅

Window Management
- Native macOS NSWindow creation
- Show/hide/destroy operations
- Resize event handling
- Clean event loop
Canvas Operations
- Rectangle drawing (filled/stroked)
- Circle drawing (filled/stroked)
- Line drawing
- Text rendering with fonts
- Full color support (RGBA)
- Stroke width control
Transformations
- Translate
- Scale
- Rotate
- Save/restore state
- Clipping rectangles
Text Rendering
- Core Text integration
- Font family support
- Font size control
- Font weight (bold)
- Color support

Rendering Demo (`examples/rendering-demo/`)

Complete working example demonstrating:

Window creation
Multiple shapes (rectangles, circles, lines)
Text rendering with different styles
Color palette display
Animation placeholder
Resize handling

Run it:

cd examples/rendering-demo
go run main.go

📦 Package Organization (Reorganized)

Core Packages (`pkg/core/`)

`framework/` (formerly `goflow/`)

Widget, Element, RenderObject interfaces
Canvas interface definition
Layout system (constraints, sizing)
Geometry primitives (Rect, Offset, Size)
App entry point

`signals/`

Signal - Reactive value containers
Computed - Derived values
Effect - Side effects
Batch - Grouped updates
Collections (SignalSlice, SignalMap)

`widgets/`

Text, Container, Column, Row
Center, Align, Stack
Flexible, Image, Icon
ListView, GestureDetector

UI Packages (`pkg/ui/`)

`adaptive/`

Platform-adaptive widgets
Auto-switches between Material/Cupertino

`material/`

Material Design widgets
Scaffold, AppBar, Drawer
Button, Card, Checkbox
TextField, FAB, BottomNav

`cupertino/`

iOS/macOS design widgets
CupertinoScaffold, NavigationBar
CupertinoButton, TextField
iOS-style theming

🎨 Framework Status

✅ Working

Core Framework:

✅ Widget system
✅ Element lifecycle
✅ RenderObject tree
✅ Layout system (box protocol)
✅ Three-tree architecture

State Management:

✅ Signals (reactive values)
✅ Computed (derived values)
✅ Effects (side effects)
✅ Collections (SignalSlice, SignalMap)
✅ Batch updates

Rendering (macOS):

✅ Native window creation
✅ Core Graphics canvas
✅ Basic shapes (rect, circle, line)
✅ Text rendering (Core Text)
✅ Colors and transparency
✅ Stroke and fill
✅ Transformations
✅ Event loop

CLI Tool:

✅ Project scaffolding (goflow create)
✅ Multiple templates (default, minimal, material)
✅ Platform selection
✅ Embedded templates

Documentation:

✅ Complete architecture docs
✅ Getting started guide
✅ Rendering architecture
✅ CLI reference
✅ Workflow guide
✅ Flutter comparison

⏳ In Progress

Rendering:

⏳ Mouse event handling
⏳ Keyboard event handling
⏳ More drawing primitives (paths, images)
⏳ Advanced text layout (multi-line, wrapping)

Platforms:

⏳ Windows backend (Direct2D)
⏳ Linux backend (Cairo)
⏳ WGPU cross-platform option

Widgets:

⏳ Input widgets (TextField, Button interactions)
⏳ Scrolling widgets implementation
⏳ More layout widgets

🔮 Planned

Core:

Hot reload
Animation system
Advanced layout (Grid, Flow)
Image loading and caching
Asset management

Rendering:

GPU acceleration
Layer caching
Dirty rectangles
Paint culling

Platform:

Native project files (Xcode, VS, CMake)
Code signing
Distribution tools

Widgets:

Complete Material Design set
Complete Cupertino set
Custom widget toolkit

📈 Code Statistics

Lines of Code (Approximate)

pkg/core/framework/    ~3,500 lines
pkg/core/signals/      ~2,000 lines
pkg/core/widgets/      ~5,000 lines
pkg/ui/adaptive/       ~1,500 lines
pkg/ui/material/       ~4,500 lines
pkg/ui/cupertino/      ~3,500 lines
backends/macos/        ~1,320 lines
cmd/goflow/            ~1,200 lines
examples/              ~2,500 lines
docs/                  ~15,000 lines (markdown)
─────────────────────────────────
TOTAL (Go code):       ~25,000 lines

Files Count

Go files:              ~66
Markdown files:        ~15
Template files:        ~12
Objective-C files:     4
Header files:          2

🚀 Next Steps

Immediate Priorities

Complete macOS Backend
- Add mouse event handling
- Add keyboard event handling
- Implement image rendering
- Add path drawing
Widget Integration
- Connect widgets to rendering backend
- Implement widget-to-canvas pipeline
- Test basic widget rendering
Platform Runners Update
- Update platform templates to use backends
- Add rendering initialization code
- Test complete workflow

Short-term Goals

Windows Backend
- Implement Direct2D canvas
- DirectWrite text rendering
- Win32 window management
Linux Backend
- Implement Cairo canvas
- Pango text rendering
- X11/Wayland window management
Examples
- Widget rendering demo
- Interactive app demo
- Complete todo app with rendering

Long-term Vision

Production Ready
- Stable APIs
- Complete documentation
- Comprehensive tests
- Performance optimization
Platform Integration
- Native project templates (Xcode, VS)
- Build automation
- Code signing
- Distribution
Advanced Features
- Hot reload
- Animation system
- DevTools
- Plugin system

🔗 Import Paths (Updated)

After reorganization:

import (
    // Core framework
    "github.com/base-go/GoFlow/pkg/core/framework"
    "github.com/base-go/GoFlow/pkg/core/signals"
    "github.com/base-go/GoFlow/pkg/core/widgets"

    // UI packages
    "github.com/base-go/GoFlow/pkg/ui/adaptive"
    "github.com/base-go/GoFlow/pkg/ui/material"
    "github.com/base-go/GoFlow/pkg/ui/cupertino"

    // Backends
    "github.com/base-go/GoFlow/backends/macos"
)

🎯 Key Achievements

✅ Working Native Rendering - First pixels on screen!
✅ Complete Core Framework - Widget/Element/RenderObject system
✅ Reactive State Management - Signals-based system
✅ CLI Tool - Project scaffolding
✅ Comprehensive Documentation - Complete guides
✅ Go Convention Structure - Professional organization
✅ Design Systems - Material + Cupertino + Adaptive

📝 Technical Highlights

Canvas Abstraction

The Canvas interface successfully abstracts platform-specific rendering:

type Canvas interface {
    Clear(color *Color)
    DrawRect(rect *Rect, paint *Paint)
    DrawCircle(center *Offset, radius float64, paint *Paint)
    DrawText(text string, offset *Offset, style *TextStyle)
    DrawLine(p1, p2 *Offset, paint *Paint)
    Save()
    Restore()
    Translate(dx, dy float64)
    Scale(sx, sy float64)
    Rotate(radians float64)
    ClipRect(rect *Rect)
}

macOS Implementation: Core Graphics ✅ Windows Implementation: Direct2D (planned) Linux Implementation: Cairo (planned) WGPU Implementation: WebGPU (optional)

CGo Bridge Pattern

Clean separation between Go and Objective-C:

Go API (canvas_macos.go)
    ↓
CGo Bindings (import "C")
    ↓
C/Objective-C Bridge (cgo_bridge.h/m)
    ↓
Core Graphics / Cocoa APIs

This pattern will work for Windows (C++) and Linux (C) backends too.

Window Management

Thread-safe window registry with callback system:

Window creation/destruction
Event loop integration
Resize callbacks
Draw callbacks
Clean lifecycle management

🧪 Testing the Renderer

Run the Rendering Demo

# Navigate to rendering demo
cd examples/rendering-demo

# Run (macOS only for now)
go run main.go

What you'll see:

Native macOS window
Title and subtitle text
Filled and stroked rectangles
Filled and stroked circles
Colored lines
Color palette swatches
Smooth rendering

Close the window to exit.

Build Your Own

package main

import (
    "github.com/base-go/GoFlow/backends/macos"
    "github.com/base-go/GoFlow/pkg/core/framework"
)

func main() {
    macos.InitApp()

    window := macos.NewWindow(800, 600, "My App")
    defer window.Destroy()

    window.SetDrawFunc(func(canvas *macos.CoreGraphicsCanvas) {
        canvas.Clear(framework.ColorWhite)

        paint := framework.NewPaint()
        paint.Color = framework.ColorBlue

        rect := framework.NewRect(
            framework.NewOffset(100, 100),
            framework.NewSize(200, 150),
        )
        canvas.DrawRect(rect, paint)
    })

    window.Show()

    for !window.ShouldClose() {
        window.PollEvents()
        window.SetNeedsDisplay()
    }
}

📚 Documentation

All documentation is up-to-date with the latest changes:

Getting Started - Complete tutorial
Architecture - Framework design
Rendering - Updated with macOS backend info
Workflow - Complete technical flow
CLI Reference - CLI documentation
Project Structure - Organization guide
Flutter Comparison - For Flutter devs

🎉 Summary

GoFlow v0.1.0+ is now a working GUI framework with:

✅ Complete core framework architecture ✅ Reactive state management ✅ Native macOS rendering (NEW!) ✅ CLI tool for project creation ✅ Comprehensive documentation ✅ Multiple design systems ✅ Professional code organization

Next milestone: Complete widget-to-renderer integration and add Windows/Linux backends!

Ready to build native desktop apps with Go! 🚀

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