From a2f183f1475483599aa0e7a1726ff2d55b2ef37e Mon Sep 17 00:00:00 2001
From: Veronica Berglyd Olsen <1619840+vkbo@users.noreply.github.com>
Date: Thu, 10 Aug 2023 21:10:08 +0200
Subject: [PATCH] Add a shared data class

---
 novelwriter/__init__.py |  2 +
 novelwriter/shared.py   | 95 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 novelwriter/shared.py

diff --git a/novelwriter/__init__.py b/novelwriter/__init__.py
index 242c7275..86706068 100644
--- a/novelwriter/__init__.py
+++ b/novelwriter/__init__.py
@@ -31,6 +31,7 @@ from PyQt5.QtWidgets import QApplication, QErrorMessage
 
 from novelwriter.error import exceptionHandler, logException
 from novelwriter.config import Config
+from novelwriter.shared import SharedData
 
 ##
 #  Version Scheme
@@ -74,6 +75,7 @@ logger = logging.getLogger(__name__)
 
 # Global config singleton
 CONFIG = Config()
+SHARED = SharedData()
 
 
 def main(sysArgs: list | None = None):
diff --git a/novelwriter/shared.py b/novelwriter/shared.py
new file mode 100644
index 00000000..68f10461
--- /dev/null
+++ b/novelwriter/shared.py
@@ -0,0 +1,95 @@
+"""
+novelWriter – Shared Data Class
+===============================
+
+File History:
+Created: 2023-08-10 [2.1b2]
+
+This file is a part of novelWriter
+Copyright 2018–2023, Veronica Berglyd Olsen
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+"""
+from __future__ import annotations
+
+import logging
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:  # pragma: no cover
+    from novelwriter.guimain import GuiMain
+    from novelwriter.gui.theme import GuiTheme
+    from novelwriter.core.project import NWProject
+
+logger = logging.getLogger(__name__)
+
+
+class SharedData:
+
+    def __init__(self) -> None:
+        self._gui = None
+        self._theme = None
+        self._project = None
+        return
+
+    @property
+    def mainGui(self) -> GuiMain:
+        """Return the Main GUI instance."""
+        if self._gui is None:
+            raise Exception("UserData class not properly initialised")
+        return self._gui
+
+    @property
+    def theme(self) -> GuiTheme:
+        """Return the GUI Theme instance."""
+        if self._theme is None:
+            raise Exception("UserData class not properly initialised")
+        return self._theme
+
+    @property
+    def project(self) -> NWProject:
+        """Return the active NWProject instance."""
+        if self._project is None:
+            raise Exception("UserData class not properly initialised")
+        return self._project
+
+    ##
+    #  Methods
+    ##
+
+    def initSharedData(self, gui: GuiMain, theme: GuiTheme) -> None:
+        """Initialise the UserData instance. This must be called as soon
+        as the Main GUI is created to ensure the SHARED singleton has the
+        properties needed for operation.
+        """
+        self._gui = gui
+        self._theme = theme
+        self._resetProject()
+        logger.debug("SharedData instance initialised")
+        return
+
+    def openProject(self):
+        return
+
+    ##
+    #  Internal Functions
+    ##
+
+    def _resetProject(self) -> None:
+        """Create a new project instance."""
+        from novelwriter.core.project import NWProject
+        self._project = NWProject(self.mainGui)
+        return
+
+# END Class SharedData