refactor: create backend folder (#17)

Author: tlambert03

src/app_model/backends/__init__.py

@@ -0,0 +1,3 @@
+"""Adapters for using the app_model with various backends."""
+
+# TODO: make a `use_app()` like adapter to easily switch?

src/app_model/backends/qt/__init__.py

@@ -0,0 +1,15 @@
+"""Qt objects for app_model."""
+from ._qaction import QCommandAction, QCommandRuleAction, QMenuItemAction
+from ._qkeymap import QKeyBindingSequence
+from ._qmenu import QModelMenu, QModelSubmenu
+from ._util import to_qicon
+
+__all__ = [
+    "QCommandAction",
+    "QCommandRuleAction",
+    "QKeyBindingSequence",
+    "QMenuItemAction",
+    "QModelMenu",
+    "QModelSubmenu",
+    "to_qicon",
+]

src/app_model/qt/_qaction.py src/app_model/backends/qt/_qaction.pysrc/app_model/qt/_qaction.py renamed to src/app_model/backends/qt/_qaction.py

@@ -6,8 +6,8 @@
 from qtpy.QtCore import Qt
 from qtpy.QtGui import QKeySequence
 
-from ..types._constants import OperatingSystem
-from ..types._keys import KeyBinding, KeyCode, KeyMod, SimpleKeyBinding
+from ...types._constants import OperatingSystem
+from ...types._keys import KeyBinding, KeyCode, KeyMod, SimpleKeyBinding
 
 QMETA = Qt.KeyboardModifier.MetaModifier
 QCTRL = Qt.KeyboardModifier.ControlModifier
@@ -164,6 +164,8 @@ def __init__(self, kb: KeyBinding) -> None:
     KeyMod.WinCtrl: Qt.KeyboardModifier.MetaModifier,
 }
 
+
+# unused/untested
 KEY_FROM_QT = {
     v.toCombined() if hasattr(v, "toCombined") else int(v): k
     for k, v in KEY_TO_QT.items()

src/app_model/qt/_qkeymap.py src/app_model/backends/qt/_qkeymap.pysrc/app_model/qt/_qkeymap.py renamed to src/app_model/backends/qt/_qkeymap.py

@@ -5,7 +5,7 @@
 from qtpy.QtCore import Qt
 from qtpy.QtWidgets import QAction, QMainWindow
 
-from app_model.qt import QModelMenu
+from app_model.backends.qt import QModelMenu
 
 if TYPE_CHECKING:
     from pytestqt.plugin import QtBot