Initial import: clean snapshot from /home/olafn/infoscreen-dev (2025-10-25)
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RobbStarkAustria
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PROGRESS_BAR_IMPLEMENTATION.md
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258
PROGRESS_BAR_IMPLEMENTATION.md
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# Progress Bar Implementation Summary
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## Overview
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The Display Manager now supports the scheduler's `page_progress` and `auto_progress` fields to control Impressive's progress bar features during presentations.
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## Implementation Details
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### Fields Supported
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| Field | Type | Impressive Option | Description |
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|-------|------|-------------------|-------------|
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| `page_progress` | boolean | `--page-progress` (or `-q`) | Shows overall progress bar indicating position in presentation |
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| `auto_progress` | boolean | `--auto-progress` (or `-k`) | Shows per-page countdown progress during auto-advance |
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### Event Flow
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1. **Scheduler sends event** with `page_progress` and `auto_progress` fields
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2. **simclient.py receives** and stores complete event in `current_event.json` (no filtering)
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3. **display_manager.py reads** event and extracts progress settings
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4. **Impressive launches** with appropriate `--page-progress` and/or `--auto-progress` options
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## Code Changes
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### simclient.py
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Enhanced documentation in `save_event_to_json()` to explicitly mention progress bar fields are preserved:
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```python
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def save_event_to_json(event_data):
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"""Speichert eine Event-Nachricht in der Datei current_event.json
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This function preserves ALL fields from the incoming event data,
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including scheduler-specific fields like:
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- page_progress: Show overall progress bar in presentation
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- auto_progress: Show per-page auto-advance countdown
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- And any other fields sent by the scheduler
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"""
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```
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### display_manager.py
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Added support for reading and using progress fields in `start_presentation()`:
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```python
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# Get scheduler-specific progress display settings
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page_progress = event.get('page_progress', False) # Show overall progress bar
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auto_progress = event.get('auto_progress', False) # Show per-page auto-advance progress
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# Later in Impressive command building:
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if page_progress:
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cmd.append('--page-progress')
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logging.info("Page progress bar enabled (shows overall position in presentation)")
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if auto_progress:
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cmd.append('--auto-progress')
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logging.info("Auto-progress bar enabled (shows per-page countdown during auto-advance)")
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```
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## Example Events
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### With Page Progress Only
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```json
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{
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"id": 100,
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"group_id": 2,
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"page_progress": true,
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"auto_progress": false,
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"presentation": {
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"auto_advance": true,
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"slide_interval": 10,
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"loop": true,
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"files": [{"name": "slides.pdf"}]
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}
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}
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```
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**Result:** Impressive shows overall progress bar at bottom: `[=====> ] 50%`
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### With Auto-Progress Only
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```json
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{
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"id": 101,
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"group_id": 2,
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"page_progress": false,
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"auto_progress": true,
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"presentation": {
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"auto_advance": true,
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"slide_interval": 10,
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"files": [{"name": "slides.pdf"}]
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}
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}
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```
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**Result:** Impressive shows countdown bar for each slide during auto-advance
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### With Both Progress Bars
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```json
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{
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"id": 102,
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"group_id": 2,
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"page_progress": true,
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"auto_progress": true,
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"presentation": {
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"auto_advance": true,
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"slide_interval": 10,
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"loop": true,
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"files": [{"name": "slides.pdf"}]
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}
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}
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```
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**Result:** Both progress indicators visible simultaneously
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### No Progress Bars (Default)
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```json
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{
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"id": 103,
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"group_id": 2,
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"presentation": {
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"auto_advance": true,
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"slide_interval": 10,
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"files": [{"name": "slides.pdf"}]
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}
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}
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```
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**Result:** Clean presentation without progress indicators (fields default to `false`)
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## Testing
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### Interactive Test Script
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```bash
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cd ~/infoscreen-dev/scripts
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./test-progress-bars.sh
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```
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This interactive script allows you to:
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1. Select a progress bar configuration (none, page only, auto only, or both)
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2. Sends test event to MQTT
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3. Verifies Display Manager processes it correctly
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4. Shows expected behavior
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### Manual Testing with mosquitto_pub
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```bash
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# Test with both progress bars
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mosquitto_pub -h localhost -t "infoscreen/events/2" -m '{
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"id": 999,
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"page_progress": true,
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"auto_progress": true,
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"presentation": {
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"auto_advance": true,
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"slide_interval": 5,
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"loop": true,
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"files": [{"name": "test.pdf"}]
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}
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}'
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```
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### Verification
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1. **Check Display Manager Log:**
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```bash
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tail -f ~/infoscreen-dev/logs/display_manager.log
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```
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Look for:
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```
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Page progress bar enabled (shows overall position in presentation)
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Auto-progress bar enabled (shows per-page countdown during auto-advance)
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```
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2. **Check Impressive Command:**
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```bash
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ps aux | grep impressive
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```
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Should show command with appropriate options:
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```
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impressive --fullscreen --nooverview --auto 5 --wrap --page-progress --auto-progress /path/to/file.pdf
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```
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3. **Visual Verification:**
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- Watch the presentation on the display
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- Page progress: Bar at bottom showing position
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- Auto-progress: Countdown overlay on each slide
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## Impressive Command Examples
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```bash
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# No progress bars (default)
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impressive --fullscreen --auto 10 --wrap presentation.pdf
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# Page progress only
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impressive --fullscreen --auto 10 --wrap --page-progress presentation.pdf
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impressive --fullscreen --auto 10 --wrap -q presentation.pdf # Short form
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# Auto-progress only
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impressive --fullscreen --auto 10 --wrap --auto-progress presentation.pdf
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impressive --fullscreen --auto 10 --wrap -k presentation.pdf # Short form
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# Both progress bars
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impressive --fullscreen --auto 10 --wrap --page-progress --auto-progress presentation.pdf
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impressive --fullscreen --auto 10 --wrap -q -k presentation.pdf # Short form
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```
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## Benefits
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1. **User Feedback**: Viewers know where they are in the presentation
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2. **Time Awareness**: Auto-progress shows how long until next slide
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3. **Professional Look**: Progress indicators enhance presentation quality
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4. **Flexible Control**: Scheduler can enable/disable per event
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5. **Backward Compatible**: Fields default to `false`, existing events work unchanged
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## Compatibility
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- ✅ **Impressive**: Full support for both progress bar features
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- ⚠️ **Evince/Okular**: Fallback viewers don't support progress bars (features ignored)
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- ✅ **PDF Files**: Native support with no conversion needed
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- ✅ **PPTX Files**: Automatic conversion to PDF, then progress bars work
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## Documentation Updates
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- ✅ README.md - Added progress bar field documentation
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- ✅ SCHEDULER_FIELDS_SUPPORT.md - Updated with implementation details
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- ✅ Code comments - Enhanced docstrings
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- ✅ Test scripts - Created test-progress-bars.sh
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- ✅ This summary document
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## Logging
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With `LOG_LEVEL=DEBUG`, you'll see:
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```
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[INFO] Event page_progress = true
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[INFO] Event auto_progress = true
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[INFO] Starting presentation: slides.pdf
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[INFO] Auto-advance enabled (interval: 10s)
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[INFO] Loop mode enabled (presentation will restart after last slide)
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[INFO] Page progress bar enabled (shows overall position in presentation)
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[INFO] Auto-progress bar enabled (shows per-page countdown during auto-advance)
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[DEBUG] Full command: impressive --fullscreen --nooverview --auto 10 --wrap --page-progress --auto-progress /path/to/slides.pdf
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```
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## Summary
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✅ **Implementation complete** - Progress bar fields are now fully supported
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✅ **Backward compatible** - Existing events without these fields work unchanged
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✅ **Well documented** - README, code comments, and test scripts updated
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✅ **Tested** - Interactive test script available
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✅ **Flexible** - Both options can be used independently or together
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✅ **Clean code** - Minimal changes, follows existing patterns
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