Session 12.24 - Page Builder Complete Overhaul

🚀 Overview

Complete rewrite of the Page Builder with:

• Interactive Drag/Move/Resize - Widgets can be dragged and resized on canvas
• Responsive Breakpoints - Mobile, Tablet, Desktop, Wide breakpoint switching
• AI Integration - Drag-drop from AI panel with smart positioning
• Modern Design - Beautiful dark theme with glassmorphism elements
• Pixel-Perfect Positioning - Platform-agnostic calculations

🎯 New Components Created

1. CanvasWidgetComponent

Path: libs/libs-structural/page-builder/src/lib/components/canvas-widget/

Interactive widget on canvas with:

• Drag - Click and drag to move widgets
• Resize - 8 resize handles (N, NE, E, SE, S, SW, W, NW)
• Selection - Click to select, visual feedback
• Keyboard shortcuts - Arrow keys to nudge, Delete to remove
• Snap to grid - Automatic grid snapping
• Zoom-aware - Calculations adjust for canvas zoom level

2. BuilderToolbarComponent

Path: libs/libs-structural/page-builder/src/lib/components/builder-toolbar/

Modern toolbar with:

• Breakpoint selector - Switch between Mobile/Tablet/Desktop/Wide
• Zoom controls - 25% to 200% with +/- buttons
• Grid toggle - Show/hide grid
• Snap toggle - Enable/disable snap to grid
• Rulers toggle - Show/hide rulers
• Undo/Redo - History controls (placeholder)
• Preview mode - Toggle between design and preview
• Save button - With unsaved indicator

3. PageCanvasComponent (Updated)

Path: libs/libs-structural/page-builder/src/lib/canvas/

Enhanced canvas with:

• Drag-drop from palette - Widget type data
• Drag-drop from AI panel - Full widget data with config
• Responsive width - Adjusts based on current breakpoint
• Grid pattern - CSS grid that respects gridSize
• Empty state - Beautiful call-to-action when no widgets
• Drop indicator - Shows where widget will be placed

4. WidgetPaletteComponent (Updated)

Path: libs/libs-structural/page-builder/src/lib/components/widget-palette/

Improved widget selection with:

• Search - Filter widgets by name/description
• Categories - All, Basic, Layout, Form, Media
• Drag-drop - Drag widgets to canvas
• AI hint - Prompt to use AI for custom widgets

📱 Responsive Breakpoint System

Breakpoints Defined

Per-Breakpoint Positioning

Widgets can have different positions per breakpoint:

interface WidgetInstance {
  positions: {
    mobile?: ResponsivePosition;
    tablet?: ResponsivePosition;
    desktop?: ResponsivePosition;
    wide?: ResponsivePosition;
  };
}

🤖 AI Panel Integration

The canvas accepts drag-drop from the AI panel in application/json format:

interface AIDragData {
  type: 'module' | 'widget' | 'template';
  data: {
    id: string;
    name: string;
    widgetType?: string;
    config?: Record<string, unknown>;
    ai?: {
      generatedAt: string;
      prompt?: string;
      confidence?: number;
    };
  };
  source: 'ai-panel' | 'palette' | 'module-generator';
}

When AI-generated widgets are dropped:

• aiGenerated: true is set on the widget
• aiPrompt stores the original prompt
• AI indicator badge appears on widget

🎨 Design System

Color Palette

• Background: #0d0d1a to #1a1a2e gradient
• Primary: #667eea (indigo)
• Secondary: #764ba2 (purple)
• Success: #10b981 (emerald)
• Warning: #f59e0b (amber)

Visual Elements

• Glassmorphism - Transparent backgrounds with blur
• Gradient accents - Purple-indigo gradients
• Smooth animations - 0.2s ease transitions
• Selection pulse - Animated selection border

🔧 State Management

PageStateService

Persisted with Flash Persistence:

• page-builder:current-page - Current page data
• page-builder:canvas-state - Zoom, grid, breakpoint settings

Key methods:

• addWidget(widget) - Add widget to page
• updateWidget(id, updates) - Update widget properties
• deleteWidget(id) - Remove widget
• selectWidget(id) - Select widget
• updateCanvasState(updates) - Update canvas settings

📋 Files Changed/Created

Created

• components/canvas-widget/canvas-widget.component.ts
• components/canvas-widget/canvas-widget.component.html
• components/canvas-widget/canvas-widget.component.scss
• components/builder-toolbar/builder-toolbar.component.ts
• components/builder-toolbar/builder-toolbar.component.html
• components/builder-toolbar/builder-toolbar.component.scss
• components/index.ts

Updated

• types/page-builder.types.ts - Added breakpoints, responsive types
• canvas/page-canvas.component.ts - Added interactive canvas
• canvas/page-canvas.component.html - New template
• canvas/page-canvas.component.scss - Beautiful styling
• components/widget-palette/* - Improved design
• page-builder.component.ts - Full orchestration
• page-builder.component.html - New layout
• page-builder.component.scss - Dark theme
• state/page-state.service.ts - Added breakpoint support
• src/index.ts - Updated exports

🧪 Testing

1. Navigate to /space/{spaceSlug}/page-builder
2. Drag widgets from left palette to canvas
3. Click widget to select - shows resize handles
4. Drag widget to move it
5. Drag handles to resize
6. Switch breakpoints in toolbar
7. Zoom in/out with +/- buttons
8. Toggle grid with grid button
9. Preview mode with eye button

⏭️ Next Steps

1. Properties Panel - Edit widget properties when selected
2. Undo/Redo - Implement history system
3. Multi-select - Shift+click for multiple selection
4. Copy/Paste - Ctrl+C/Ctrl+V support
5. Rulers - Visual rulers on canvas edges
6. Layers panel - Widget z-index management
7. Export - Export to HTML/CSS code