Add UI preference to picture cache type under Qt

qt/pe/preferences_dialog.py

@@ -4,7 +4,9 @@
 # which should be included with this package. The terms are also available at
 # http://www.gnu.org/licenses/gpl-3.0.html
 
+from PyQt5.QtWidgets import QLabel
 from hscommon.trans import trget
+from qtlib.radio_box import RadioBox
 from core.scanner import ScanType
 from core.app import AppMode
 
@@ -28,10 +30,14 @@ class PreferencesDialog(PreferencesDialogBase):
         self.widgetsVLayout.addWidget(self.ignoreHardlinkMatches)
         self._setupAddCheckbox('debugModeBox', tr("Debug mode (restart required)"))
         self.widgetsVLayout.addWidget(self.debugModeBox)
+        self.widgetsVLayout.addWidget(QLabel(tr("Picture cache mode:")))
+        self.cacheTypeRadio = RadioBox(self, items=["Sqlite", "Shelve"], spread=False)
+        self.widgetsVLayout.addWidget(self.cacheTypeRadio)
         self._setupBottomPart()
 
     def _load(self, prefs, setchecked):
         setchecked(self.matchScaledBox, prefs.match_scaled)
+        self.cacheTypeRadio.selected_index = 1 if prefs.picture_cache_type == 'shelve' else 0
 
         # Update UI state based on selected scan type
         scan_type = prefs.get_scan_type(AppMode.Picture)
@@ -40,4 +46,5 @@ class PreferencesDialog(PreferencesDialogBase):
 
     def _save(self, prefs, ischecked):
         prefs.match_scaled = ischecked(self.matchScaledBox)
+        prefs.picture_cache_type = 'shelve' if self.cacheTypeRadio.selected_index == 1 else 'sqlite'