Addon Manager: Refactor main GUI area

src/Mod/AddonManager/composite_view.py

@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# ***************************************************************************
+# *                                                                         *
+# *   Copyright (c) 2022-2024 FreeCAD Project Association                   *
+# *                                                                         *
+# *   This file is part of FreeCAD.                                         *
+# *                                                                         *
+# *   FreeCAD is free software: you can redistribute it and/or modify it    *
+# *   under the terms of the GNU Lesser General Public License as           *
+# *   published by the Free Software Foundation, either version 2.1 of the  *
+# *   License, or (at your option) any later version.                       *
+# *                                                                         *
+# *   FreeCAD is distributed in the hope that it will be useful, but        *
+# *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+# *   Lesser General Public License for more details.                       *
+# *                                                                         *
+# *   You should have received a copy of the GNU Lesser General Public      *
+# *   License along with FreeCAD. If not, see                               *
+# *   <https://www.gnu.org/licenses/>.                                      *
+# *                                                                         *
+# ***************************************************************************
+
+""" Provides a class for showing the list view and detail view at the same time. """
+
+import addonmanager_freecad_interface
+
+# Get whatever version of PySide we can
+try:
+    import PySide  # Use the FreeCAD wrapper
+except ImportError:
+    try:
+        import PySide6  # Outside FreeCAD, try Qt6 first
+
+        PySide = PySide6
+    except ImportError:
+        import PySide2  # Fall back to Qt5 (if this fails, Python will kill this module's import)
+
+        PySide = PySide2
+
+from PySide import QtCore, QtWidgets
+
+
+class CompositeView(QtWidgets.QWidget):
+    """A widget that displays the Addon Manager's top bar, the list of Addons, and the detail
+    view, all on a single pane (with no switching). Detail view is shown in its "icon-only" mode
+    for the installation, etc. buttons. The bottom bar remains visible throughout."""
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+    # TODO: Refactor the Addon Manager's display into four custom widgets:
+    # 1) The top bar showing the filter and search
+    # 2) The package list widget, which can take three forms (expanded, compact, and list)
+    # 3) The installer bar, which can take two forms (text and icon)
+    # 4) The bottom bar