loading flatpak db in a different thread

README.md

@@ -4,7 +4,6 @@ Wriiten in Python for QT5.
 
 ### Roadmap
 - Test installer for Ubuntu
-- Load the database in a thread when the application starts. It will prevent the delay of showing the icon.
 - Locales
 - System notification whe new updates
 - Search and install applications.

app.py

@@ -1,4 +1,5 @@
 #!env/bin/python
+import argparse
 import sys
 
 from PyQt5.QtWidgets import QApplication, QWidget
@@ -6,9 +7,15 @@ from PyQt5.QtWidgets import QApplication, QWidget
 from core.controller import FlatpakController
 from core.model import FlatpakManager
 from view.qt.systray import TrayIcon
+from core import __version__
+
+parser = argparse.ArgumentParser(prog='fpakman', description="GUI for Flatpak applications management")
+parser.add_argument('-v', '--version', action='version', version='%(prog)s {}'.format(__version__))
+args = parser.parse_args()
 
 app = QApplication(sys.argv)
 manager = FlatpakManager()
+manager.load_database_async()
 controller = FlatpakController(manager)
 hidden_widget = QWidget()
 trayIcon = TrayIcon(parent=hidden_widget, controller=controller, check_interval=30)

core/model.py

@@ -1,3 +1,4 @@
+from threading import Lock, Thread
 from typing import List
 
 import requests
@@ -17,15 +18,23 @@ class FlatpakManager:
         self.apps = []
         self.apps_db = {}
         self.http_session = requests.Session()
-        self._load_database()
+        self.lock_db_read = Lock()
 
-    def _load_database(self):
+    def load_database_async(self):
+        Thread(target=self.load_database).start()
 
-        res = self.http_session.get(__FLATHUB_API_URL__ + '/apps')
+    def load_database(self):
 
-        if res.status_code == 200:
-            for app in res.json():
-                self.apps_db[app['flatpakAppId']] = app
+        self.lock_db_read.acquire()
+
+        try:
+            res = self.http_session.get(__FLATHUB_API_URL__ + '/apps')
+
+            if res.status_code == 200:
+                for app in res.json():
+                    self.apps_db[app['flatpakAppId']] = app
+        finally:
+            self.lock_db_read.release()
 
     def get_version(self):
         return flatpak.get_version()
@@ -41,6 +50,9 @@ class FlatpakManager:
 
             for app in installed:
 
+                if not self.apps_db:
+                    self.load_database()
+
                 if self.apps_db:
                     app_data = self.apps_db.get(app['id'], None)
                 else:

run.sh

@@ -1,2 +0,0 @@
-#!/bin/bash
-/home/dafiti/workspace/fpakman/env/bin/python /home/dafiti/workspace/fpakman/app.py

view/qt/window.py

@@ -3,8 +3,8 @@ from functools import reduce
 from threading import Lock
 from typing import List
 
-from PyQt5.QtCore import Qt, QThread, pyqtSignal, QUrl
-from PyQt5.QtGui import QIcon, QColor, QPixmap
+from PyQt5.QtCore import Qt, QThread, pyqtSignal, QUrl, QEvent
+from PyQt5.QtGui import QIcon, QColor, QPixmap, QWindowStateChangeEvent
 from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest
 from PyQt5.QtWidgets import QWidget, QVBoxLayout, QApplication, QTableWidget, \
     QTableWidgetItem, QTableView, QCheckBox, QHeaderView, QToolButton, QToolBar, \
@@ -105,9 +105,7 @@ class ManageWindow(QWidget):
         self.table_apps.setHorizontalHeaderLabels(ManageWindow.__COLUMNS__)
         self.table_apps.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
 
-        header_horizontal = self.table_apps.horizontalHeader()
-        for i in range(0, len(ManageWindow.__COLUMNS__)):
-            header_horizontal.setSectionResizeMode(i, QHeaderView.Stretch + QHeaderView.AdjustToContents)
+        self._change_table_headers_policy()
 
         self.layout.addWidget(self.table_apps)
 
@@ -130,6 +128,16 @@ class ManageWindow(QWidget):
 
         self.centralize()
 
+    def _change_table_headers_policy(self, policy: QHeaderView = QHeaderView.ResizeToContents):
+        header_horizontal = self.table_apps.horizontalHeader()
+        for i in range(0, len(ManageWindow.__COLUMNS__)):
+            header_horizontal.setSectionResizeMode(i, policy)
+
+    def changeEvent(self, e: QEvent):
+
+        if isinstance(e, QWindowStateChangeEvent):
+            self._change_table_headers_policy(QHeaderView.Stretch if self.isMaximized() else QHeaderView.ResizeToContents)
+
     def closeEvent(self, event):
 
         if self.tray_icon: