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Implement Program Structure Explorer (GitHub issue #6123)
- Add hierarchical tree view sidebar for block navigation - Implement collapsible nodes with expand/collapse functionality - Add block navigation and highlighting features - Include responsive design with dark mode support - Integrate with existing block system and stage - Add toggle button and proper event handling Files: - js/program-explorer.js (new) - Core explorer logic - css/program-explorer.css (new) - Complete styling - js/activity.js (modified) - Explorer initialization - js/loader.js (modified) - Module configuration - index.html (modified) - Resource loading - PROGRAM_EXPLORER_IMPLEMENTATION.md (new) - Documentation
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‎PROGRAM_EXPLORER_IMPLEMENTATION.md‎

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# Program Explorer Implementation Summary
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## Overview
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Successfully implemented a Program Structure Explorer for Music Blocks as requested in GitHub issue #6123. This feature provides a collapsible tree view sidebar that visualizes block hierarchy and allows quick navigation within complex compositions.
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## Files Created/Modified
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### New Files
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1. **js/program-explorer.js** - Main explorer logic with:
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- Block hierarchy extraction from connections
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- Collapsible tree view rendering
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- Block navigation and highlighting
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- Live updates when blocks change
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2. **css/program-explorer.css** - Complete styling with:
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- Responsive design for different screen sizes
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- Dark mode support
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- Material Design icons
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- Smooth animations and transitions
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### Modified Files
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1. **js/activity.js** - Added explorer initialization:
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- Added `programExplorer` property to activity
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- Initialize explorer in `finishedLoading` event handler
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2. **js/loader.js** - Added module configuration:
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- Added `program-explorer` to shim configuration
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- Set proper dependencies and exports
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3. **index.html** - Added resource loading:
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- Added program-explorer.css preload
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- Added program-explorer.js script tag
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## Key Features Implemented
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### ✅ Core Functionality
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- **Hierarchical Tree View**: Extracts and displays block hierarchy from parent-child relationships
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- **Collapsible Nodes**: Expand/collapse functionality for nested blocks
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- **Block Navigation**: Click tree nodes to scroll to corresponding blocks in canvas
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- **Block Highlighting**: Visual feedback when selecting blocks from tree
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- **Live Updates**: Tree updates automatically when blocks are added/removed/moved
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### ✅ User Interface
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- **Toggle Button**: Floating button to show/hide explorer
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- **Responsive Design**: Works on desktop, tablet, and mobile
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- **Dark Mode Support**: Follows system theme preferences
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- **Material Icons**: Consistent with existing Music Blocks design
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- **Smooth Animations**: Professional transitions and hover effects
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### ✅ Technical Quality
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- **Code Standards**: Follows existing Music Blocks patterns
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- **Error Handling**: Graceful fallbacks for edge cases
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- **Performance**: Efficient tree building and rendering
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- **Accessibility**: Proper ARIA labels and keyboard support
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- **Prettier Formatted**: Consistent code style throughout
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## Usage Instructions
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1. **Open Explorer**: Click the tree icon button in the top-right corner
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2. **Navigate**: Click any block name in the tree to jump to that block
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3. **Expand/Collapse**: Click arrow icons to show/hide nested blocks
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4. **Close**: Click the X button or toggle button to hide the explorer
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## Integration Points
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- **Blocks System**: Uses existing `connections` array for hierarchy
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- **Stage System**: Integrates with CreateJS stage for navigation
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- **Event System**: Hooks into block add/remove operations
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- **Theme System**: Follows existing dark/light theme patterns
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## Testing
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The implementation has been tested with:
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- Basic block stacks
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- Nested control structures (loops, conditionals)
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- Action blocks and their calls
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- Various block types (pitch, rhythm, flow, etc.)
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- Responsive behavior on different screen sizes
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- Dark/light theme switching
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## Future Enhancements (Optional)
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The current implementation provides all core functionality requested in the issue. Potential future improvements could include:
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- Block search functionality
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- Workspace minimap
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- Collapsible block groups
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- Timeline-based visualization for musical sequences
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## Files Summary
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```
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js/program-explorer.js - Core explorer implementation (491 lines)
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css/program-explorer.css - Complete styling (responsive, dark mode)
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js/activity.js - Explorer initialization integration
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js/loader.js - Module configuration
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index.html - Resource loading
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```
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Total new code: ~600 lines (excluding comments and whitespace)
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Total modified code: ~10 lines (minimal integration changes)
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The implementation is production-ready and follows all Music Blocks coding standards.

‎css/program-explorer.css‎

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/* Program Explorer Styles */
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.program-explorer {
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position: fixed;
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top: 60px;
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right: 20px;
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width: 300px;
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height: calc(100vh - 100px);
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background: #ffffff;
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border: 1px solid #cccccc;
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border-radius: 8px;
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box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
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z-index: 1000;
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display: flex;
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flex-direction: column;
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font-family: "Noto Sans", sans-serif;
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font-size: 14px;
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}
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/* Dark mode support */
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body.dark .program-explorer {
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background: #2e2e2e;
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border-color: #555555;
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color: #ffffff;
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}
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.program-explorer-header {
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display: flex;
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justify-content: space-between;
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align-items: center;
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padding: 16px;
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border-bottom: 1px solid #e0e0e0;
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background: #f5f5f5;
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border-radius: 8px 8px 0 0;
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}
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body.dark .program-explorer-header {
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background: #3e3e3e;
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border-bottom-color: #555555;
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}
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.program-explorer-header h3 {
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margin: 0;
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font-size: 16px;
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font-weight: 600;
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color: #333333;
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}
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body.dark .program-explorer-header h3 {
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color: #ffffff;
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}
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.explorer-close-btn {
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background: none;
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border: none;
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cursor: pointer;
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padding: 4px;
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border-radius: 4px;
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display: flex;
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align-items: center;
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justify-content: center;
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color: #666666;
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transition: background-color 0.2s;
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}
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.explorer-close-btn:hover {
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background-color: rgba(0, 0, 0, 0.1);
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}
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body.dark .explorer-close-btn {
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color: #cccccc;
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}
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body.dark .explorer-close-btn:hover {
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background-color: rgba(255, 255, 255, 0.1);
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}
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.explorer-close-btn i {
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font-size: 18px;
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}
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.program-explorer-tree {
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flex: 1;
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overflow-y: auto;
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padding: 8px;
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}
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.explorer-empty {
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text-align: center;
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color: #666666;
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font-style: italic;
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padding: 20px;
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}
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body.dark .explorer-empty {
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color: #cccccc;
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}
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.explorer-tree-node {
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margin-bottom: 2px;
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}
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.explorer-node-content {
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display: flex;
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align-items: center;
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padding: 8px 12px;
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cursor: pointer;
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border-radius: 4px;
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transition: background-color 0.2s;
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user-select: none;
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}
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.explorer-node-content:hover {
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background-color: rgba(0, 123, 255, 0.1);
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}
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body.dark .explorer-node-content:hover {
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background-color: rgba(0, 123, 255, 0.2);
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}
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.explorer-expand-icon {
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font-size: 18px !important;
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margin-right: 4px;
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color: #666666;
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transition: transform 0.2s;
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}
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body.dark .explorer-expand-icon {
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color: #cccccc;
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}
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.explorer-spacer {
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margin-right: 4px;
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}
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.explorer-block-icon {
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font-size: 16px !important;
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margin-right: 8px;
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color: #0066ff;
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}
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.explorer-node-name {
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flex: 1;
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color: #333333;
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white-space: nowrap;
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overflow: hidden;
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text-overflow: ellipsis;
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}
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body.dark .explorer-node-name {
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color: #ffffff;
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}
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.explorer-children {
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margin-left: 8px;
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}
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.explorer-tree-node.collapsed .explorer-children {
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display: none;
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}
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.explorer-tree-node.collapsed .explorer-expand-icon {
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transform: rotate(-90deg);
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}
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/* Toggle button */
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.explorer-toggle-btn {
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position: fixed;
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top: 80px;
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right: 20px;
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width: 48px;
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height: 48px;
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background: #0066ff;
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border: none;
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border-radius: 50%;
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color: white;
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cursor: pointer;
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box-shadow: 0 2px 8px rgba(0, 102, 255, 0.3);
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display: flex;
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align-items: center;
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justify-content: center;
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transition: all 0.3s ease;
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z-index: 999;
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}
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.explorer-toggle-btn:hover {
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background: #0052cc;
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box-shadow: 0 4px 12px rgba(0, 102, 255, 0.4);
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transform: translateY(-1px);
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}
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.explorer-toggle-btn:active {
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transform: translateY(0);
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}
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.explorer-toggle-btn.active {
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background: #0052cc;
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}
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.explorer-toggle-btn i {
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font-size: 24px !important;
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}
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/* Responsive design */
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@media (max-width: 768px) {
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.program-explorer {
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width: 250px;
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right: 10px;
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top: 50px;
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height: calc(100vh - 80px);
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}
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.explorer-toggle-btn {
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right: 10px;
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top: 70px;
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}
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}
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@media (max-width: 480px) {
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.program-explorer {
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width: 200px;
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right: 5px;
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top: 40px;
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height: calc(100vh - 60px);
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}
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.explorer-toggle-btn {
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right: 5px;
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top: 60px;
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width: 40px;
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height: 40px;
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}
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.explorer-toggle-btn i {
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font-size: 20px !important;
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}
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.explorer-node-content {
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padding: 6px 8px;
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}
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.program-explorer-header {
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padding: 12px;
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}
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.program-explorer-header h3 {
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font-size: 14px;
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}
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}
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/* Scrollbar styling */
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.program-explorer-tree::-webkit-scrollbar {
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width: 6px;
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}
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.program-explorer-tree::-webkit-scrollbar-track {
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background: #f1f1f1;
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border-radius: 3px;
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}
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body.dark .program-explorer-tree::-webkit-scrollbar-track {
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background: #3e3e3e;
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}
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.program-explorer-tree::-webkit-scrollbar-thumb {
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background: #c1c1c1;
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border-radius: 3px;
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}
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body.dark .program-explorer-tree::-webkit-scrollbar-thumb {
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background: #555555;
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}
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.program-explorer-tree::-webkit-scrollbar-thumb:hover {
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background: #a8a8a8;
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}
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body.dark .program-explorer-tree::-webkit-scrollbar-thumb:hover {
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background: #666666;
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}
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/* Animation for tree expansion */
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.explorer-children {
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transition: all 0.2s ease-in-out;
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overflow: hidden;
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}
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/* Highlight effect for selected blocks */
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.explorer-node-content.selected {
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background-color: rgba(0, 123, 255, 0.2);
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border-left: 3px solid #0066ff;
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}
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body.dark .explorer-node-content.selected {
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background-color: rgba(0, 123, 255, 0.3);
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}

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