🎉 Add prompt before exiting the program (#271)

pyflow/graphics/window.py

@@ -16,6 +16,7 @@
     QMainWindow,
     QMessageBox,
     QMdiArea,
+    QCheckBox,
 )
 
 from pyflow.graphics.widget import Widget
@@ -71,6 +72,7 @@ def __init__(self):
         self.updateMenus()
 
         # Window properties
+        self.never_show_exit_prompt = False
         self.readSettings()
         self.show()
 
@@ -451,47 +453,53 @@ def onEditRun(self):
         if len(selected_blocks) == 1:
             selected_blocks[0].run_left()
 
-    # def closeEvent(self, event:QEvent):
-    #     """ Save and quit the application. """
-    #     if self.maybeSave():
-    #         event.accept()
-    #     else:
-    #         event.ignore()
+    def allWidgetsAreSaved(self):
+        """Return true if all widgets are saved."""
+
+        for widget in self.mdiArea.subWindowList():
+            if isinstance(widget.widget(), Widget):
+                if widget.widget().isModified():
+                    return False
+
+        return True
 
     def closeEvent(self, event: QCloseEvent):
-        """Save and quit the application."""
+        """Handle the event when the window is about to be closed."""
+
+        if self.allWidgetsAreSaved() or self.never_show_exit_prompt:
+            self.closeWindow(event)
+            return
+
+        # Show the exit without saving prompt
+        quit_msg = "Exit without saving?"
+        msgbox = QMessageBox(self)
+        msgbox.setText(quit_msg)
+        msgbox.setWindowTitle("Exit?")
+        msgbox.addButton(QMessageBox.Yes)
+        msgbox.addButton(QMessageBox.No)
+        cb = QCheckBox("Never show this again")
+        msgbox.setCheckBox(cb)
+        msgbox.exec()
+
+        if msgbox.checkBox().checkState() == Qt.CheckState.Checked:
+            self.never_show_exit_prompt = True
+            self.writeSettings()
+
+        if msgbox.result() == int(str(QMessageBox.No)):
+            event.ignore()
+            return
+
+        self.closeWindow(event)
+
+    def closeWindow(self, event: QCloseEvent):
+        """Close the window."""
         self.mdiArea.closeAllSubWindows()
         if self.mdiArea.currentSubWindow():
             event.ignore()
         else:
             self.writeSettings()
             event.accept()
 
-    def maybeSave(self) -> bool:
-        """Ask for save and returns if the file should be closed.
-
-        Returns:
-            True if the file should be closed, False otherwise.
-
-        """
-        if not self.isModified():
-            return True
-
-        answer = QMessageBox.warning(
-            self,
-            "About to loose you work?",
-            "The file has been modified.\n" "Do you want to save your changes?",
-            QMessageBox.StandardButton.Save
-            | QMessageBox.StandardButton.Discard
-            | QMessageBox.StandardButton.Cancel,
-        )
-
-        if answer == QMessageBox.StandardButton.Save:
-            return self.onFileSave()
-        if answer == QMessageBox.StandardButton.Discard:
-            return True
-        return False
-
     def activeMdiChild(self) -> Widget:
         """Get the active Widget if existing."""
         activeSubWindow = self.mdiArea.activeSubWindow()
@@ -508,6 +516,8 @@ def readSettings(self):
         self.resize(size)
         if settings.value("isMaximized", False) == "true":
             self.showMaximized()
+        if settings.value("NeverShowExitPrompt", False) == "true":
+            self.never_show_exit_prompt = True
         LOGGER.info("Loaded settings under Bycelium/Pyflow")
 
     def writeSettings(self):
@@ -516,6 +526,7 @@ def writeSettings(self):
         settings.setValue("pos", self.pos())
         settings.setValue("size", self.size())
         settings.setValue("isMaximized", self.isMaximized())
+        settings.setValue("NeverShowExitPrompt", self.never_show_exit_prompt)
         LOGGER.info("Saved settings under Bycelium/Pyflow")
 
     def setActiveSubWindow(self, window):