[ui] FileSaveDialog: Added Validation to the file save process

Validating the filename to ensure that the file does not gets saved with just the extension

Author: waaake

meshroom/ui/qml/Application.qml

@@ -59,6 +59,48 @@ Page {
         return ""
     }
 
+    Dialog {
+        id: invalidFileDialog
+        title: "Invalid File"
+
+        // The dialog to reopen when user clicks 'OK'
+        property var redial: null
+
+        x: parent.width / 2 - width / 2
+        y: parent.height / 2 - height / 2
+        height: 120
+
+        // What appears in the dialog
+        Row {
+            MaterialLabel { text: MaterialIcons.warning; color: "#FF9800"; font.pointSize: 30 }
+            Label { width: 20 }  // A kind of spacer
+
+            Column {
+                Label { text: "The filepath provided is not valid. Please provide a valid file path/name to save the file." }
+                Label { id: message; text: ""; color: "#FF9800" }
+                Label { text: "Click OK to return to File Dialog, Cancel to cancel the save process." }
+            }
+        }
+
+        // Standard buttons for the Dialog
+        standardButtons: Dialog.Ok | Dialog.Cancel
+
+        onAccepted: {
+            if (redial) redial.open()
+        }
+        onRejected: {
+            if (redial) redial.closed(Platform.Dialog.Rejected)
+        }
+
+        function show(filepath) {
+            // Update the message which is displayed on the error dialog
+            message.text = "Provided Path: " + filepath
+
+            // open the dialog
+            this.open()
+        }
+    }
+
     // File dialogs
     Platform.FileDialog {
         id: saveFileDialog
@@ -71,6 +113,15 @@ Page {
         defaultSuffix: ".mg"
         fileMode: Platform.FileDialog.SaveFile
         onAccepted: {
+            // Validate if the filename without any spaces is just .mg ?
+            if (Filepath.basename(currentFile).trim() === ".mg") {
+                // If that's the case then show an error to the user about the filepath being wrong
+                invalidFileDialog.redial = saveFileDialog
+                invalidFileDialog.show(Filepath.urlToString(currentFile))
+                return
+            }
+
+            // Only save a valid file
             _reconstruction.saveAs(currentFile)
             MeshroomApp.addRecentProjectFile(currentFile.toString())
             closed(Platform.Dialog.Accepted)
@@ -89,6 +140,15 @@ Page {
         defaultSuffix: ".mg"
         fileMode: Platform.FileDialog.SaveFile
         onAccepted: {
+            // Validate if the filename without any spaces is just .mg ?
+            if (Filepath.basename(currentFile).trim() === ".mg") {
+                // If that's the case then show an error to the user about the filepath being wrong
+                invalidFileDialog.redial = saveTemplateDialog
+                invalidFileDialog.show(Filepath.urlToString(currentFile))
+                return
+            }
+
+            // Only save a valid template
             _reconstruction.saveAsTemplate(currentFile)
             closed(Platform.Dialog.Accepted)
             MeshroomApp.reloadTemplateList()