Add ability to use non-native dialog for directories

- Add preference for native dialogs
- Add non-native directory selection to allow selecting multiple folders
  fixes #874 when using non-native.

qt/directories_dialog.py

@@ -6,6 +6,7 @@
 
 from PyQt5.QtCore import QRect, Qt
 from PyQt5.QtWidgets import (
+    QListView,
     QWidget,
     QFileDialog,
     QHeaderView,
@@ -285,14 +286,25 @@ class DirectoriesDialog(QMainWindow):
 
     # --- Events
     def addFolderTriggered(self):
+        no_native = not self.app.prefs.use_native_dialogs
         title = tr("Select a folder to add to the scanning list")
-        flags = QFileDialog.ShowDirsOnly
-        dirpath = str(QFileDialog.getExistingDirectory(self, title, self.lastAddedFolder, flags))
-        if not dirpath:
+        file_dialog = QFileDialog(self, title, self.lastAddedFolder)
+        file_dialog.setFileMode(QFileDialog.DirectoryOnly)
+        file_dialog.setOption(QFileDialog.DontUseNativeDialog, no_native)
+        if no_native:
+            file_view = file_dialog.findChild(QListView, "listView")
+            if file_view:
+                file_view.setSelectionMode(QAbstractItemView.MultiSelection)
+            f_tree_view = file_dialog.findChild(QTreeView)
+            if f_tree_view:
+                f_tree_view.setSelectionMode(QAbstractItemView.MultiSelection)
+        if not file_dialog.exec():
             return
-        self.lastAddedFolder = dirpath
-        self.app.model.add_directory(dirpath)
-        self.recentFolders.insertItem(dirpath)
+
+        paths = file_dialog.selectedFiles()
+        self.lastAddedFolder = paths[-1]
+        [self.app.model.add_directory(path) for path in paths]
+        [self.recentFolders.insertItem(path) for path in paths]
 
     def appModeButtonSelected(self, index):
         if index == 2:

qt/preferences.py

@@ -30,6 +30,7 @@ class Preferences(PreferencesBase):
         if not self.language and trans.installed_lang:
             self.language = trans.installed_lang
         self.portable = get("Portable", False)
+        self.use_native_dialogs = get("UseNativeDialogs", True)
 
         self.tableFontSize = get("TableFontSize", self.tableFontSize)
         self.reference_bold_font = get("ReferenceBoldFont", self.reference_bold_font)
@@ -92,6 +93,7 @@ class Preferences(PreferencesBase):
         self.destination_type = 1
         self.custom_command = ""
         self.language = trans.installed_lang if trans.installed_lang else ""
+        self.use_native_dialogs = True
 
         self.tableFontSize = QApplication.font().pointSize()
         self.reference_bold_font = True
@@ -140,6 +142,7 @@ class Preferences(PreferencesBase):
         set_("CustomCommand", self.custom_command)
         set_("Language", self.language)
         set_("Portable", self.portable)
+        set_("UseNativeDialogs", self.use_native_dialogs)
 
         set_("TableFontSize", self.tableFontSize)
         set_("ReferenceBoldFont", self.reference_bold_font)

qt/preferences_dialog.py

@@ -158,6 +158,16 @@ On MacOS, the tab bar will fill up the window's width instead."
             )
         )
         layout.addWidget(self.tabs_default_pos)
+        self._setupAddCheckbox(
+            "use_native_dialogs",
+            tr("Use native OS dialogs"),
+        )
+        self.use_native_dialogs.setToolTip(
+            tr(
+                "For actions such as file/folder selection use the OS native dialogs.\nSome native dialogs have limited functionality."
+            )
+        )
+        layout.addWidget(self.use_native_dialogs)
         self.ui_groupbox.setLayout(layout)
         self.displayVLayout.addWidget(self.ui_groupbox)
 
@@ -286,6 +296,7 @@ use the modifier key to drag the floating window around"
         if section & Sections.DISPLAY:
             setchecked(self.reference_bold_font, prefs.reference_bold_font)
             setchecked(self.tabs_default_pos, prefs.tabs_default_pos)
+            setchecked(self.use_native_dialogs, prefs.use_native_dialogs)
             setchecked(
                 self.details_dialog_titlebar_enabled,
                 prefs.details_dialog_titlebar_enabled,
@@ -329,6 +340,7 @@ use the modifier key to drag the floating window around"
         prefs.custom_command = str(self.customCommandEdit.text())
         prefs.tableFontSize = self.fontSizeSpinBox.value()
         prefs.tabs_default_pos = ischecked(self.tabs_default_pos)
+        prefs.use_native_dialogs = ischecked(self.use_native_dialogs)
         lang = self.supportedLanguages[self.languageComboBox.currentIndex()]
         oldlang = self.app.prefs.language
         if oldlang not in self.supportedLanguages: