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main.py

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+import sys
+import time
+from PyQt6.QtCore import Qt
+from PyQt6.QtWidgets import QApplication
+from db.database import init_db
+from ui.dock import PanelWindow, _set_autostart
+from ui.ball import FloatBall, BALL_SIZE
+import ui.theme as theme
+from db import database
+
+
+def _wake_existing_or_exit() -> bool:
+    """
+    Windows 单实例：
+    - 若已有进程在运行：唤醒已有窗口并返回 False（当前进程退出）
+    - 若无已有进程：返回 True（继续正常启动）
+    """
+    if sys.platform != "win32":
+        return True
+
+    import ctypes
+    import ctypes.wintypes
+
+    mutex_name = r"Global\CleanDesktopOrganizerSingleton"
+    title = "牛马软件柜"
+
+    kernel32 = ctypes.windll.kernel32
+    user32 = ctypes.windll.user32
+
+    ERROR_ALREADY_EXISTS = 183
+    h_mutex = kernel32.CreateMutexW(None, False, mutex_name)
+    if not h_mutex:
+        return True
+
+    last_err = kernel32.GetLastError()
+    if last_err == ERROR_ALREADY_EXISTS:
+        # 轮询一小段时间，避免首次窗口尚未创建
+        hwnd = None
+        for _ in range(8):  # ~2.4s
+            hwnd = user32.FindWindowW(None, title)
+            if hwnd:
+                break
+            time.sleep(0.3)
+
+        if hwnd:
+            # SW_SHOW = 5
+            user32.ShowWindow(hwnd, 5)
+            user32.SetForegroundWindow(hwnd)
+        return False
+
+    return True
+
+
+def main():
+    # 必须在创建 QApplication 之前：不按各显示器缩放，逻辑像素固定（跨分辨率/跨屏拖动宽高保持一致）
+    if not _wake_existing_or_exit():
+        return
+    QApplication.setAttribute(Qt.ApplicationAttribute.AA_Use96Dpi, True)
+    # 这个策略同样要求在创建 QApplication 前设置
+    try:
+        QApplication.setHighDpiScaleFactorRoundingPolicy(
+            Qt.HighDpiScaleFactorRoundingPolicy.PassThrough
+        )
+    except Exception:
+        pass
+    app = QApplication(sys.argv)
+    app.setQuitOnLastWindowClosed(False)
+
+    init_db()
+    theme.load()          # 从数据库读取上次主题
+    _set_autostart(True)
+
+    panel = PanelWindow()
+    ball = FloatBall()
+
+    panel._ball_ref = ball
+
+    ball.clicked.connect(lambda: panel.show_near(ball.pos(), BALL_SIZE))
+    ball.right_clicked.connect(lambda pos: panel.tray.contextMenu().exec(pos))
+
+    # 判断是否有保存的位置：有则直接在原位显示，没有则用悬浮球旁边
+    has_saved = bool(database.get_setting("panel_x", ""))
+    if has_saved:
+        # _restore_geometry 已在 PanelWindow.__init__ 里执行，直接 show
+        panel.setWindowOpacity(0)
+        panel.show()
+        panel.raise_()
+        if hasattr(panel, "_ball_ref"):
+            panel._ball_ref.hide()
+        # 淡入
+        from PyQt6.QtCore import QPropertyAnimation
+        anim = QPropertyAnimation(panel, b"windowOpacity")
+        anim.setDuration(180)
+        anim.setStartValue(0.0)
+        anim.setEndValue(1.0)
+        anim.start()
+        panel._anim = anim
+    else:
+        ball._place_default()
+        panel.show_near(ball.pos(), BALL_SIZE)
+
+    sys.exit(app.exec())
+
+
+if __name__ == "__main__":
+    main()