Add Qt preview window launcher

gui/__init__.py

@@ -0,0 +1 @@
+"""GUI package for optional Qt tooling."""

gui/qt_launcher.py

@@ -0,0 +1,61 @@
+"""Standalone Qt preview window launcher."""
+from __future__ import annotations
+
+import sys
+
+
+QtWidgets = None
+QtCore = None
+
+try:  # Prefer PySide6 when available.
+    from PySide6 import QtCore, QtWidgets  # type: ignore
+except Exception:  # pragma: no cover - optional dependency
+    try:
+        from PyQt6 import QtCore, QtWidgets  # type: ignore
+    except Exception as exc:  # pragma: no cover - optional dependency
+        raise SystemExit(
+            "PySide6 or PyQt6 is required to launch the Qt preview window. "
+            "Install one of them and try again."
+        ) from exc
+
+
+class QtPreviewWindow(QtWidgets.QMainWindow):
+    """Simple placeholder Qt window for incremental migration."""
+
+    def __init__(self) -> None:
+        super().__init__()
+        self.setWindowTitle("AlphaDEX Qt Preview")
+        self.resize(900, 600)
+
+        container = QtWidgets.QWidget()
+        layout = QtWidgets.QVBoxLayout(container)
+
+        heading = QtWidgets.QLabel("Qt Preview Window")
+        heading.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        heading.setStyleSheet("font-size: 20px; font-weight: 600;")
+
+        body = QtWidgets.QLabel(
+            "This window is launched from the Tkinter app to begin a staged Qt migration.\n"
+            "Add new Qt panels here as they are ported from the Tk interface."
+        )
+        body.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        body.setWordWrap(True)
+
+        layout.addStretch(1)
+        layout.addWidget(heading)
+        layout.addSpacing(12)
+        layout.addWidget(body)
+        layout.addStretch(2)
+
+        self.setCentralWidget(container)
+
+
+def main() -> int:
+    app = QtWidgets.QApplication.instance() or QtWidgets.QApplication(sys.argv)
+    window = QtPreviewWindow()
+    window.show()
+    return app.exec()
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

main_gui.py

@@ -29,6 +29,7 @@
 # from ttkthemes import ThemedStyle as Style
 # import ttkbootstrap as tb; Style = tb.Style
 import json
+import importlib.util
 import queue
 import subprocess
 from tkinter import filedialog, messagebox, Text, Scrollbar
@@ -6137,6 +6138,10 @@ def build_ui(self):
             label="Duplicate Pair Review…",
             command=self._open_duplicate_pair_review_tool,
         )
+        tools_menu.add_command(
+            label="Qt Preview Window…",
+            command=self._open_qt_preview_window,
+        )
         tools_menu.add_command(label="M4A Tester…", command=self._open_m4a_tester_tool)
         tools_menu.add_command(label="Opus Tester…", command=self._open_opus_tester_tool)
         tools_menu.add_separator()
@@ -8638,6 +8643,29 @@ def _open_file_cleanup_tool(self) -> None:
     def _open_duplicate_bucketing_poc_tool(self) -> None:
         DuplicateBucketingPocDialog(self)
 
+    def _open_qt_preview_window(self) -> None:
+        qt_available = any(
+            importlib.util.find_spec(module)
+            for module in ("PySide6", "PyQt6")
+        )
+        if not qt_available:
+            messagebox.showerror(
+                "Qt Preview",
+                "PySide6 or PyQt6 is not installed. Install one of them to launch the Qt preview window.",
+            )
+            return
+
+        try:
+            subprocess.Popen(
+                [sys.executable, "-m", "gui.qt_launcher"],
+                cwd=str(Path(__file__).resolve().parent),
+            )
+        except Exception as exc:
+            messagebox.showerror(
+                "Qt Preview",
+                f"Unable to launch the Qt preview window: {exc}",
+            )
+
     def _open_m4a_tester_tool(self) -> None:
         M4ATesterDialog(self)
 

requirements.txt

@@ -29,6 +29,7 @@ tqdm
 ttkthemes
 ttkbootstrap
 sv-ttk
+PySide6
 
 # Optional alternative audio engine; see README.md for install steps
 # essentia==2.1b6