Add reusable messagebox based on QML MessageDialog

Contributes to CURA-1730 and CURA-1850

cura/CuraApplication.py

@@ -47,6 +47,7 @@ import cura.Settings
 
 from PyQt5.QtCore import pyqtSlot, QUrl, pyqtSignal, pyqtProperty, QEvent, Q_ENUMS
 from PyQt5.QtGui import QColor, QIcon
+from PyQt5.QtWidgets import QMessageBox
 from PyQt5.QtQml import qmlRegisterUncreatableType, qmlRegisterSingletonType, qmlRegisterType
 
 import platform
@@ -155,6 +156,8 @@ class CuraApplication(QtApplication):
         self._cura_actions = None
         self._started = False
 
+        self._message_box_callback = None
+
         self._i18n_catalog = i18nCatalog("cura")
 
         self.getController().getScene().sceneChanged.connect(self.updatePlatformActivity)
@@ -251,6 +254,19 @@ class CuraApplication(QtApplication):
     def _onEngineCreated(self):
         self._engine.addImageProvider("camera", CameraImageProvider.CameraImageProvider())
 
+    ## A reusable dialogbox
+    #
+    showMessageBox = pyqtSignal(str, str, str, str, int, int, arguments = ["title", "text", "informativeText", "detailedText", "buttons", "icon"])
+    def messageBox(self, title, text, informativeText = "", detailedText = "", buttons = QMessageBox.Ok, icon = QMessageBox.NoIcon, callback = None):
+        self._message_box_callback = callback
+        self.showMessageBox.emit(title, text, informativeText, detailedText, buttons, icon)
+
+    @pyqtSlot(int)
+    def messageBoxClosed(self, button):
+        if self._message_box_callback:
+            self._message_box_callback(button)
+            self._message_box_callback = None
+
     showPrintMonitor = pyqtSignal(bool, arguments = ["show"])
 
     ##  Cura has multiple locations where instance containers need to be saved, so we need to handle this differently.

resources/qml/Cura.qml

@@ -683,6 +683,35 @@ UM.MainWindow
         }
     }
 
+    MessageDialog
+    {
+        id: messageDialog
+        modality: Qt.ApplicationModal
+        onAccepted: Printer.messageBoxClosed(clickedButton)
+        onApply: Printer.messageBoxClosed(clickedButton)
+        onDiscard: Printer.messageBoxClosed(clickedButton)
+        onHelp: Printer.messageBoxClosed(clickedButton)
+        onNo: Printer.messageBoxClosed(clickedButton)
+        onRejected: Printer.messageBoxClosed(clickedButton)
+        onReset: Printer.messageBoxClosed(clickedButton)
+        onYes: Printer.messageBoxClosed(clickedButton)
+    }
+
+    Connections
+    {
+        target: Printer
+        onShowMessageBox:
+        {
+            messageDialog.title = title
+            messageDialog.text = text
+            messageDialog.informativeText = informativeText
+            messageDialog.detailedText = detailedText
+            messageDialog.standardButtons = buttons
+            messageDialog.icon = icon
+            messageDialog.visible = true
+        }
+    }
+
     Connections
     {
         target: Cura.Actions.addMachine