chore(deps): make Qt backend optional

TODO:
- [ ] Add relevant entry in CHANGELOG
- [ ] Update install documentation
- [ ] Make sure `manim-slides convert` can run without any Qt backend
- [ ] Make sure test suite works (partially) without any Qt backend
- [ ] Make sure we can import `manim_slides` without any Qt backend

manim_slides/config.py

@@ -17,7 +17,7 @@
     model_validator,
 )
 from pydantic_extra_types.color import Color
-from PySide6.QtCore import Qt
+from qtpy.QtCore import Qt
 
 from .logger import logger
 

manim_slides/present/__init__.py

@@ -6,7 +6,7 @@
 import click
 from click import Context, Parameter
 from pydantic import ValidationError
-from PySide6.QtCore import Qt
+from qtpy.QtCore import Qt
 
 from ..commons import config_path_option, folder_path_option, verbosity_option
 from ..config import Config, PresentationConfig

manim_slides/present/player.py

@@ -2,11 +2,11 @@
 from pathlib import Path
 from typing import List, Optional
 
-from PySide6.QtCore import Qt, QTimer, QUrl, Signal, Slot
-from PySide6.QtGui import QCloseEvent, QIcon, QKeyEvent, QScreen
-from PySide6.QtMultimedia import QMediaPlayer
-from PySide6.QtMultimediaWidgets import QVideoWidget
-from PySide6.QtWidgets import (
+from qtpy.QtCore import Qt, QTimer, QUrl, Signal, Slot
+from qtpy.QtGui import QCloseEvent, QIcon, QKeyEvent, QScreen
+from qtpy.QtMultimedia import QMediaPlayer
+from qtpy.QtMultimediaWidgets import QVideoWidget
+from qtpy.QtWidgets import (
     QHBoxLayout,
     QLabel,
     QMainWindow,

manim_slides/qt_utils.py

@@ -1,6 +1,6 @@
 """Qt utils."""
 
-from PySide6.QtWidgets import QApplication
+from qtpy.QtWidgets import QApplication
 
 
 def qapp() -> QApplication:

manim_slides/resources.py

@@ -4,7 +4,7 @@
 # Created by: The Resource Compiler for Qt version 6.4.0
 # WARNING! All changes made in this file will be lost!
 
-from PySide6 import QtCore
+from qtpy import QtCore
 
 qt_resource_data = b"\
 \x00\x00\x08\x1c\

manim_slides/wizard.py

@@ -4,9 +4,9 @@
 from typing import Any
 
 import click
-from PySide6.QtCore import Qt
-from PySide6.QtGui import QIcon, QKeyEvent
-from PySide6.QtWidgets import (
+from qtpy.QtCore import Qt
+from qtpy.QtGui import QIcon, QKeyEvent
+from qtpy.QtWidgets import (
     QDialog,
     QDialogButtonBox,
     QGridLayout,

pyproject.toml

@@ -56,9 +56,10 @@ opencv-python = "^4.6.0.66"
 pillow = "^9.5.0"
 pydantic = "^2.0.1"
 pydantic-extra-types = "^2.0.0"
-pyside6 = "6.5.2"
+pyside6 = {version = "6.5.2", optional = true}
 python = ">=3.8.1,<3.12"
 python-pptx = "^0.6.21"
+qtpy = "^2.4.1"
 requests = "^2.28.1"
 rich = "^13.3.2"
 rtoml = "^0.9.0"
@@ -68,6 +69,7 @@ tqdm = "^4.64.1"
 magic = ["manim", "ipython"]
 manim = ["manim"]
 manimgl = ["manimgl"]
+pyside6 = ["PySide6"]
 sphinx-directive = ["docutils", "manim"]
 
 [tool.poetry.group.dev]

tests/test_present.py

@@ -3,7 +3,7 @@
 
 import pytest
 from click.testing import CliRunner
-from PySide6.QtWidgets import QApplication
+from qtpy.QtWidgets import QApplication
 
 from manim_slides.present import present
 

tests/test_qt_utils.py

@@ -1,4 +1,4 @@
-from PySide6.QtWidgets import QApplication
+from qtpy.QtWidgets import QApplication
 
 from manim_slides.qt_utils import qapp
 

tests/test_wizard.py

@@ -1,8 +1,8 @@
 from pathlib import Path
 
 from click.testing import CliRunner
-from PySide6.QtCore import Qt
-from PySide6.QtWidgets import (
+from qtpy.QtCore import Qt
+from qtpy.QtWidgets import (
     QApplication,
     QMessageBox,
 )