QLAYOUT_FIX_COMPLETE.md•3.54 kB
# FreeCAD AI Workbench QLayout Error Fix - COMPLETED ✅
## Problem Fixed
**QLayout Error**: "QLayout: Attempting to add QLayout to QWidget which already has a layout"
This error was preventing the FreeCAD AI workbench interface from displaying properly after the nuclear minimal initialization was clicked.
## Root Cause
The issue was in the layout management when transitioning from the minimal UI to the full UI. The problem occurred in multiple methods:
1. `_setup_full_ui()` method (line ~248)
2. `_setup_ui_safe()` method (line ~543)
3. `_create_fallback_ui()` method (line ~721)
The bug was caused by:
```python
# WRONG - Creates layout conflict
layout = QtWidgets.QVBoxLayout(self.main_widget) # Sets layout immediately
```
This happened because:
1. `old_layout.deleteLater()` schedules deletion but doesn't immediately remove the layout
2. Immediately after, we try to set a new layout on a widget that still has the old layout
3. Qt throws the QLayout error because a widget can only have one layout
## Solution Applied
Fixed the layout management in all three methods by:
1. **Proper widget clearing** before layout deletion:
```python
# Clear all widgets from old layout
while old_layout.count():
child = old_layout.takeAt(0)
if child.widget():
child.widget().deleteLater()
```
2. **Explicit layout removal**:
```python
# Process events to ensure widgets are deleted
if hasattr(QtWidgets, 'QApplication'):
QtWidgets.QApplication.processEvents()
# Set layout to None explicitly before deleting
self.main_widget.setLayout(None)
old_layout.deleteLater()
```
3. **Safe layout creation**:
```python
# Create new layout without parent first, then set it
layout = QtWidgets.QVBoxLayout()
layout.setSpacing(2)
layout.setContentsMargins(2, 2, 2, 2)
# Set the layout on the widget
self.main_widget.setLayout(layout)
```
## Files Modified
- `/home/jango/Git/mcp-freecad/freecad-ai/gui/main_widget.py`
- Fixed `_setup_full_ui()` method
- Fixed `_setup_ui_safe()` method
- Fixed `_create_fallback_ui()` method
## Test Results ✅
Based on the log file `/tmp/freecad_layout_fix_test.log`:
- ✅ **No QLayout errors**: The "QLayout: Attempting to add QLayout" error is completely gone
- ✅ **Successful initialization**: "Full initialization completed successfully"
- ✅ **UI setup works**: "Setting up full UI..." → "Full UI setup complete"
- ✅ **Tabs created**: "Creating full feature tabs..." → "All tabs created successfully"
- ✅ **Interface functional**: Multiple "Interface command activated" entries show user interaction works
- ✅ **No crashes**: No segmentation faults or crashes detected
## Status: COMPLETED
The FreeCAD AI workbench now loads successfully and displays the full interface without QLayout conflicts. Users can:
1. Start with nuclear minimal mode (prevents crashes)
2. Click to initialize full functionality
3. Get complete interface with all tabs (Chat, Agent, Settings, etc.)
4. No layout-related errors or crashes
The workbench is now fully functional and stable!
## Previous Issues Fixed
As part of the comprehensive fix process, we also resolved:
1. ✅ **Indentation error** (line 1325) - Fixed excessive indentation
2. ✅ **Workbench toolbar creation** - Replaced problematic `_create_toolbar()` method
3. ✅ **Initialization flow** - Fixed `_initialize_full_functionality()` to actually call `_setup_full_ui()`
4. ✅ **QLayout conflicts** - Fixed layout management in UI setup methods
All major loading and functionality issues are now resolved.