Add initial dark style for use in Windows

- Other platforms can achieve this with the OS theme so not enabled for them at this time.
- Adds preference in display options to use dark style, default is false.

qt/app.py

@@ -8,11 +8,11 @@ import sys
 import os.path as op
 
 from PyQt5.QtCore import QTimer, QObject, QUrl, pyqtSignal, Qt
-from PyQt5.QtGui import QDesktopServices
+from PyQt5.QtGui import QColor, QDesktopServices, QPalette
-from PyQt5.QtWidgets import QApplication, QFileDialog, QDialog, QMessageBox
+from PyQt5.QtWidgets import QApplication, QFileDialog, QDialog, QMessageBox, QStyleFactory, QToolTip
 
 from hscommon.trans import trget
-from hscommon import desktop
+from hscommon import desktop, plat
 
 from qtlib.about_box import AboutBox
 from qtlib.recent import Recent
@@ -197,6 +197,8 @@ class DupeGuru(QObject):
         if self.details_dialog:
             self.details_dialog.update_options()
 
+        self._set_style("dark" if self.prefs.use_dark_style else "light")
+
     # --- Private
     def _get_details_dialog_class(self):
         if self.model.app_mode == AppMode.PICTURE:
@@ -214,6 +216,39 @@ class DupeGuru(QObject):
         else:
             return PreferencesDialogStandard
 
+    def _set_style(self, style="light"):
+        # Only support this feature on windows for now
+        if not plat.ISWINDOWS:
+            return
+        if style == "dark":
+            QApplication.setStyle(QStyleFactory.create("Fusion"))
+            palette = QApplication.style().standardPalette()
+            palette.setColor(QPalette.ColorRole.Window, QColor(53, 53, 53))
+            palette.setColor(QPalette.ColorRole.WindowText, Qt.white)
+            palette.setColor(QPalette.ColorRole.Base, QColor(25, 25, 25))
+            palette.setColor(QPalette.ColorRole.AlternateBase, QColor(53, 53, 53))
+            palette.setColor(QPalette.ColorRole.ToolTipBase, QColor(53, 53, 53))
+            palette.setColor(QPalette.ColorRole.ToolTipText, Qt.white)
+            palette.setColor(QPalette.ColorRole.Text, Qt.white)
+            palette.setColor(QPalette.ColorRole.Button, QColor(53, 53, 53))
+            palette.setColor(QPalette.ColorRole.ButtonText, Qt.white)
+            palette.setColor(QPalette.ColorRole.BrightText, Qt.red)
+            palette.setColor(QPalette.ColorRole.Link, QColor(42, 130, 218))
+            palette.setColor(QPalette.ColorRole.Highlight, QColor(42, 130, 218))
+            palette.setColor(QPalette.ColorRole.HighlightedText, Qt.black)
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Text, QColor(164, 166, 168))
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.WindowText, QColor(164, 166, 168))
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, QColor(164, 166, 168))
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.HighlightedText, QColor(164, 166, 168))
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Base, QColor(68, 68, 68))
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Window, QColor(68, 68, 68))
+            palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Highlight, QColor(68, 68, 68))
+        else:
+            QApplication.setStyle(QStyleFactory.create("windowsvista" if plat.ISWINDOWS else "Fusion"))
+            palette = QApplication.style().standardPalette()
+        QToolTip.setPalette(palette)
+        QApplication.setPalette(palette)
+
     # --- Public
     def add_selected_to_ignore_list(self):
         self.model.add_selected_to_ignore_list()

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_dark_style = get("UseDarkStyle", False)
         self.use_native_dialogs = get("UseNativeDialogs", True)
 
         self.tableFontSize = get("TableFontSize", self.tableFontSize)
@@ -95,6 +96,7 @@ class Preferences(PreferencesBase):
         self.destination_type = 1
         self.custom_command = ""
         self.language = trans.installed_lang if trans.installed_lang else ""
+        self.use_dark_style = False
         self.use_native_dialogs = True
 
         self.tableFontSize = QApplication.font().pointSize()
@@ -146,6 +148,7 @@ class Preferences(PreferencesBase):
         set_("CustomCommand", self.custom_command)
         set_("Language", self.language)
         set_("Portable", self.portable)
+        set_("UseDarkStyle", self.use_dark_style)
         set_("UseNativeDialogs", self.use_native_dialogs)
 
         set_("TableFontSize", self.tableFontSize)

qt/preferences_dialog.py

@@ -29,6 +29,7 @@ from PyQt5.QtWidgets import (
     QFormLayout,
 )
 from PyQt5.QtGui import QPixmap, QIcon
+from hscommon import plat
 
 from hscommon.trans import trget
 from hscommon.plat import ISLINUX
@@ -168,6 +169,9 @@ On MacOS, the tab bar will fill up the window's width instead."
             )
         )
         layout.addWidget(self.use_native_dialogs)
+        if plat.ISWINDOWS:
+            self._setupAddCheckbox("use_dark_style", tr("Use dark style"))
+            layout.addWidget(self.use_dark_style)
         self.ui_groupbox.setLayout(layout)
         self.displayVLayout.addWidget(self.ui_groupbox)
 
@@ -297,6 +301,7 @@ use the modifier key to drag the floating window around"
             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.use_dark_style, prefs.use_dark_style)
             setchecked(
                 self.details_dialog_titlebar_enabled,
                 prefs.details_dialog_titlebar_enabled,
@@ -341,6 +346,7 @@ use the modifier key to drag the floating window around"
         prefs.tableFontSize = self.fontSizeSpinBox.value()
         prefs.tabs_default_pos = ischecked(self.tabs_default_pos)
         prefs.use_native_dialogs = ischecked(self.use_native_dialogs)
+        prefs.use_dark_style = ischecked(self.use_dark_style)
         lang = self.supportedLanguages[self.languageComboBox.currentIndex()]
         oldlang = self.app.prefs.language
         if oldlang not in self.supportedLanguages: