move "Look & Feel/Main interface" to its own widget

src/calibre/gui2/preferences/look_feel.py

@@ -10,16 +10,12 @@ from functools import partial
 from threading import Thread
 
 from qt.core import (
-    QApplication,
     QBrush,
     QColor,
     QColorDialog,
     QComboBox,
     QDialog,
     QDialogButtonBox,
-    QFont,
-    QFontDialog,
-    QFontInfo,
     QFormLayout,
     QHeaderView,
     QIcon,
@@ -41,22 +37,19 @@ from qt.core import (
 )
 
 from calibre import human_readable
-from calibre.constants import ismacos, iswindows
 from calibre.ebooks.metadata.book.render import DEFAULT_AUTHOR_LINK
 from calibre.ebooks.metadata.sources.prefs import msprefs
-from calibre.gui2 import config, default_author_link, error_dialog, gprefs, icon_resource_manager, open_local_file, qt_app, question_dialog
+from calibre.gui2 import config, default_author_link, error_dialog, gprefs, open_local_file, question_dialog
 from calibre.gui2.custom_column_widgets import get_field_list as em_get_field_list
 from calibre.gui2.library.alternate_views import CM_TO_INCH, auto_height
-from calibre.gui2.preferences import ConfigWidgetBase, Setting, set_help_tips, test_widget
+from calibre.gui2.preferences import ConfigWidgetBase, test_widget
 from calibre.gui2.preferences.coloring import EditRules
 from calibre.gui2.preferences.look_feel_tabs import DisplayedFields, export_layout, import_layout, move_field_down, move_field_up, reset_layout
 from calibre.gui2.preferences.look_feel_ui import Ui_Form
 from calibre.gui2.widgets import BusyCursor
 from calibre.gui2.widgets2 import Dialog
 from calibre.startup import connect_lambda
-from calibre.utils.config import prefs
 from calibre.utils.icu import sort_key
-from calibre.utils.localization import available_translations, get_lang, get_language
 from calibre.utils.resources import get_path as P
 from calibre.utils.resources import set_data
 from polyglot.builtins import iteritems
@@ -322,53 +315,21 @@ class Background(QWidget):  # {{{
 # }}}
 
 
-class LanguageSetting(Setting):
-
-    def commit(self):
-        val = self.get_gui_val()
-        oldval = self.get_config_val()
-        if val != oldval:
-            gprefs.set('last_used_language', oldval)
-        return super().commit()
-
-
 class ConfigWidget(ConfigWidgetBase, Ui_Form):
 
     size_calculated = pyqtSignal(object)
 
     def genesis(self, gui):
         self.gui = gui
-        self.ui_style_available = True
-        if not ismacos and not iswindows:
-            self.label_widget_style.setVisible(False)
-            self.opt_ui_style.setVisible(False)
-            self.ui_style_available = False
 
         db = gui.library_view.model().db
 
         r = self.register
 
-        try:
-            self.icon_theme_title = icon_resource_manager.user_theme_title
-        except Exception:
-            self.icon_theme_title = _('Default icons')
-        self.icon_theme.setText(_('Icon theme: <b>%s</b>') % self.icon_theme_title)
-        self.commit_icon_theme = None
-        self.icon_theme_button.clicked.connect(self.choose_icon_theme)
         self.default_author_link = DefaultAuthorLink(self.default_author_link_container)
         self.default_author_link.changed_signal.connect(self.changed_signal)
-        r('ui_style', gprefs, restart_required=True, choices=[(_('System default'), 'system'), (_('calibre style'), 'calibre')])
-        r('book_list_tooltips', gprefs)
-        r('dnd_merge', gprefs)
-        r('wrap_toolbar_text', gprefs, restart_required=True)
-        r('show_layout_buttons', gprefs)
-        r('show_sb_all_actions_button', gprefs)
-        # r('show_sb_preference_button', gprefs)
-        r('row_numbers_in_book_list', gprefs)
         r('bd_show_cover', gprefs)
         r('bd_overlay_cover_size', gprefs)
-        r('cover_corner_radius', gprefs)
-        r('cover_corner_radius_unit', gprefs, choices=[(_('Pixels'), 'px'), (_('Percentage'), '%')])
         r('cover_grid_width', gprefs)
         r('cover_grid_height', gprefs)
         r('cover_grid_cache_size_multiple', gprefs)
@@ -379,48 +340,13 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         r('emblem_size', gprefs)
         r('emblem_position', gprefs, choices=[
             (_('Left'), 'left'), (_('Top'), 'top'), (_('Right'), 'right'), (_('Bottom'), 'bottom')])
-        r('book_list_extra_row_spacing', gprefs)
-        r('booklist_grid', gprefs)
         r('book_details_comments_heading_pos', gprefs, choices=[
             (_('Never'), 'hide'), (_('Above text'), 'above'), (_('Beside text'), 'side')])
         r('book_details_note_link_icon_width', gprefs)
         self.id_links_button.clicked.connect(self.edit_id_link_rules)
 
-        def get_esc_lang(l):
-            if l == 'en':
-                return 'English'
-            return get_language(l)
-
-        lang = get_lang()
-        if lang is None or lang not in available_translations():
-            lang = 'en'
-        items = [(l, get_esc_lang(l)) for l in available_translations()
-                 if l != lang]
-        if lang != 'en':
-            items.append(('en', get_esc_lang('en')))
-        items.sort(key=lambda x: x[1].lower())
-        choices = [(y, x) for x, y in items]
-        # Default language is the autodetected one
-        choices = [(get_language(lang), lang)] + choices
-        lul = gprefs.get('last_used_language')
-        if lul and (lul in available_translations() or lul in ('en', 'eng')):
-            choices.insert(1, ((get_language(lul), lul)))
-        r('language', prefs, choices=choices, restart_required=True, setting=LanguageSetting)
-
-        r('disable_animations', config)
-        r('systray_icon', config, restart_required=True)
-        r('show_splash_screen', gprefs)
-        r('disable_tray_notification', config)
         r('use_roman_numerals_for_series_number', config)
 
-        choices = [(_('Off'), 'off'), (_('Small'), 'small'),
-            (_('Medium-small'), 'mid-small'), (_('Medium'), 'medium'), (_('Large'), 'large')]
-        r('toolbar_icon_size', gprefs, choices=choices)
-
-        choices = [(_('If there is enough room'), 'auto'), (_('Always'), 'always'),
-            (_('Never'), 'never')]
-        r('toolbar_text', gprefs, choices=choices)
-
         fm = db.field_metadata
         choices = sorted(((fm[k]['name'], k) for k in fm.displayable_field_keys() if fm[k]['name']),
                          key=lambda x:sort_key(x[0]))
@@ -441,9 +367,6 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         r('edit_metadata_single_cc_label_length', gprefs)
         r('edit_metadata_templates_only_F2_on_booklist', gprefs)
 
-        self.current_font = self.initial_font = None
-        self.change_font_button.clicked.connect(self.change_font)
-
         self.display_model = DisplayedFields(self.gui.current_db, self.field_display_order)
         self.display_model.dataChanged.connect(self.changed_signal)
         self.field_display_order.setModel(self.display_model)
@@ -527,37 +450,10 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         self.sections_view.setSpacing(4)
         self.sections_view.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
         self.tabWidget.currentWidget().setFocus(Qt.FocusReason.OtherFocusReason)
-        self.opt_ui_style.currentIndexChanged.connect(self.update_color_palette_state)
-        self.opt_gui_layout.addItem(_('Wide'), 'wide')
-        self.opt_gui_layout.addItem(_('Narrow'), 'narrow')
-        self.opt_gui_layout.currentIndexChanged.connect(self.changed_signal)
-        set_help_tips(self.opt_gui_layout, config.help('gui_layout'))
-        self.button_adjust_colors.clicked.connect(self.adjust_colors)
-
-    def adjust_colors(self):
-        from calibre.gui2.dialogs.palette import PaletteConfig
-        d = PaletteConfig(self)
-        if d.exec() == QDialog.DialogCode.Accepted:
-            d.apply_settings()
-            self.changed_signal.emit()
 
     def initial_tab_changed(self):
         self.sections_view.setCurrentRow(self.tabWidget.currentIndex())
 
-    def update_color_palette_state(self):
-        if self.ui_style_available:
-            enabled = self.opt_ui_style.currentData() == 'calibre'
-            self.button_adjust_colors.setEnabled(enabled)
-
-    def choose_icon_theme(self):
-        from calibre.gui2.icon_theme import ChooseTheme
-        d = ChooseTheme(self)
-        if d.exec() == QDialog.DialogCode.Accepted:
-            self.commit_icon_theme = d.commit_changes
-            self.icon_theme_title = d.new_theme_title or _('Default icons')
-            self.icon_theme.setText(_('Icon theme: <b>%s</b>') % self.icon_theme_title)
-            self.changed_signal.emit()
-
     def edit_id_link_rules(self):
         if IdLinksEditor(self).exec() == QDialog.DialogCode.Accepted:
             self.changed_signal.emit()
@@ -595,12 +491,6 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         ConfigWidgetBase.initialize(self)
 
         self.default_author_link.value = default_author_link()
-        font = gprefs['font']
-        if font is not None:
-            font = list(font)
-            font.append(gprefs.get('font_stretch', QFont.Stretch.Unstretched))
-        self.current_font = self.initial_font = font
-        self.update_font_display()
         self.display_model.initialize()
         self.em_display_model.initialize()
         self.bd_vertical_cats_model.initialize()
@@ -622,8 +512,6 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         self.opt_book_details_css.blockSignals(True)
         self.opt_book_details_css.setPlainText(P('templates/book_details.css', data=True).decode('utf-8'))
         self.opt_book_details_css.blockSignals(False)
-        self.update_color_palette_state()
-        self.opt_gui_layout.setCurrentIndex(0 if self.gui.layout_container.is_wide else 1)
 
     def open_cg_cache(self):
         open_local_file(self.gui.grid_view.thumbnail_cache.location)
@@ -659,11 +547,6 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
     def restore_defaults(self):
         ConfigWidgetBase.restore_defaults(self)
         self.default_author_link.value = DEFAULT_AUTHOR_LINK
-        ofont = self.current_font
-        self.current_font = None
-        if ofont is not None:
-            self.changed_signal.emit()
-            self.update_font_display()
         self.display_model.restore_defaults()
         self.em_display_model.restore_defaults()
         self.bd_vertical_cats_model.restore_defaults()
@@ -674,7 +557,6 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         self.set_cg_color(gprefs.defaults['cover_grid_color'])
         self.set_cg_texture(gprefs.defaults['cover_grid_texture'])
         self.opt_book_details_css.setPlainText(P('templates/book_details.css', allow_user_override=False, data=True).decode('utf-8'))
-        self.opt_gui_layout.setCurrentIndex(0)
 
     def change_cover_grid_color(self):
         col = QColorDialog.getColor(self.cg_bg_widget.bcol,
@@ -702,40 +584,8 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         self.set_cg_texture(gprefs.defaults['cover_grid_texture'])
         self.changed_signal.emit()
 
-    def build_font_obj(self):
-        font_info = qt_app.original_font if self.current_font is None else self.current_font
-        font = QFont(*(font_info[:4]))
-        font.setStretch(font_info[4])
-        return font
-
-    def update_font_display(self):
-        font = self.build_font_obj()
-        fi = QFontInfo(font)
-        name = str(fi.family())
-
-        self.font_display.setFont(font)
-        self.font_display.setText(name + f' [{fi.pointSize()}pt]')
-
-    def change_font(self, *args):
-        fd = QFontDialog(self.build_font_obj(), self)
-        if fd.exec() == QDialog.DialogCode.Accepted:
-            font = fd.selectedFont()
-            fi = QFontInfo(font)
-            self.current_font = [str(fi.family()), fi.pointSize(),
-                    fi.weight(), fi.italic(), font.stretch()]
-            self.update_font_display()
-            self.changed_signal.emit()
-
     def commit(self, *args):
         with BusyCursor():
-            rr = ConfigWidgetBase.commit(self, *args)
-            if self.current_font != self.initial_font:
-                gprefs['font'] = (self.current_font[:4] if self.current_font else
-                        None)
-                gprefs['font_stretch'] = (self.current_font[4] if self.current_font
-                        is not None else QFont.Stretch.Unstretched)
-                QApplication.setFont(self.font_display.font())
-                rr = True
             self.display_model.commit()
             self.em_display_model.commit()
             self.bd_vertical_cats_model.commit()
@@ -744,36 +594,24 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
             self.grid_rules.commit(self.gui.current_db.prefs)
             gprefs['cover_grid_color'] = tuple(self.cg_bg_widget.bcol.getRgb())[:3]
             gprefs['cover_grid_texture'] = self.cg_bg_widget.btex
-            if self.commit_icon_theme is not None:
-                self.commit_icon_theme()
             gprefs['default_author_link'] = self.default_author_link.value
             bcss = self.opt_book_details_css.toPlainText().encode('utf-8')
             defcss = P('templates/book_details.css', data=True, allow_user_override=False)
             if defcss == bcss:
                 bcss = None
             set_data('templates/book_details.css', bcss)
-            self.gui.layout_container.change_layout(self.gui, self.opt_gui_layout.currentIndex() == 0)
-        return rr
 
     def refresh_gui(self, gui):
         gui.book_details.book_info.refresh_css()
-        gui.place_layout_buttons()
         m = gui.library_view.model()
         m.update_db_prefs_cache()
         m.beginResetModel(), m.endResetModel()
-        self.update_font_display()
         gui.tags_view.model().reset_tag_browser()
         gui.library_view.refresh_book_details(force=True)
         gui.library_view.refresh_grid()
         gui.library_view.refresh_composite_edit()
-        gui.library_view.set_row_header_visibility()
-        for view in 'library memory card_a card_b'.split():
-            getattr(gui, view + '_view').set_row_header_visibility()
-        gui.library_view.refresh_row_sizing()
         gui.grid_view.refresh_settings()
         gui.update_auto_scroll_timeout()
-        gui.sb_all_gui_actions_button.setVisible(gprefs['show_sb_all_actions_button'])
-        # gui.sb_preferences_button.setVisible(gprefs['show_sb_preference_button'])
 
 
 if __name__ == '__main__':

src/calibre/gui2/preferences/look_feel.ui

@@ -19,7 +19,7 @@
      <property name="currentIndex">
       <number>0</number>
      </property>
-     <widget class="QWidget" name="main_interface_tab">
+     <widget class="MainInterfaceTab" name="main_interface_tab">
       <attribute name="icon">
        <iconset resource="../../../../resources/images.qrc">
         <normaloff>:/images/lt.png</normaloff>:/images/lt.png</iconset>
@@ -27,353 +27,6 @@
       <attribute name="title">
        <string>&amp;Main interface</string>
       </attribute>
-      <layout class="QGridLayout" name="gridLayout_7">
-       <item row="0" column="0">
-        <widget class="QLabel" name="label_widget_style">
-         <property name="text">
-          <string>User interface style (&amp;needs restart):</string>
-         </property>
-         <property name="buddy">
-          <cstring>opt_ui_style</cstring>
-         </property>
-        </widget>
-       </item>
-       <item row="0" column="1">
-        <widget class="QComboBox" name="opt_ui_style"/>
-       </item>
-       <item row="0" column="2">
-        <layout class="QHBoxLayout">
-         <item>
-          <spacer name="horizontalSpacer_3">
-           <property name="orientation">
-            <enum>Qt::Horizontal</enum>
-           </property>
-           <property name="sizeHint" stdset="0">
-            <size>
-             <width>20</width>
-             <height>1</height>
-            </size>
-           </property>
-          </spacer>
-         </item>
-        </layout>
-       </item>
-       <item row="1" column="0">
-        <widget class="QLabel" name="icon_theme">
-         <property name="text">
-          <string/>
-         </property>
-        </widget>
-       </item>
-       <item row="1" column="1">
-        <widget class="QPushButton" name="icon_theme_button">
-         <property name="text">
-          <string>Change &amp;icon theme</string>
-         </property>
-        </widget>
-       </item>
-       <item row="2" column="0">
-        <widget class="QLabel" name="opt_color_palette_label">
-         <property name="text">
-          <string>User interface &amp;colors:</string>
-         </property>
-         <property name="buddy">
-          <cstring>button_adjust_colors</cstring>
-         </property>
-        </widget>
-       </item>
-       <item row="2" column="1">
-        <widget class="QPushButton" name="button_adjust_colors">
-         <property name="text">
-          <string>Adjust &amp;colors</string>
-         </property>
-        </widget>
-       </item>
-       <item row="3" column="0">
-        <widget class="QLabel" name="label_17">
-         <property name="text">
-          <string>&amp;User interface layout:</string>
-         </property>
-         <property name="buddy">
-          <cstring>opt_gui_layout</cstring>
-         </property>
-        </widget>
-       </item>
-       <item row="3" column="1">
-        <widget class="QComboBox" name="opt_gui_layout">
-         <property name="maximumSize">
-          <size>
-           <width>250</width>
-           <height>16777215</height>
-          </size>
-         </property>
-         <property name="sizeAdjustPolicy">
-          <enum>QComboBox::AdjustToMinimumContentsLengthWithIcon</enum>
-         </property>
-         <property name="minimumContentsLength">
-          <number>20</number>
-         </property>
-        </widget>
-       </item>
-       <item row="4" column="0">
-        <widget class="QLabel" name="label_7">
-         <property name="text">
-          <string>Choose &amp;language (needs restart):</string>
-         </property>
-         <property name="buddy">
-          <cstring>opt_language</cstring>
-         </property>
-        </widget>
-       </item>
-       <item row="4" column="1">
-        <widget class="QComboBox" name="opt_language">
-         <property name="sizeAdjustPolicy">
-          <enum>QComboBox::AdjustToMinimumContentsLengthWithIcon</enum>
-         </property>
-         <property name="minimumContentsLength">
-          <number>20</number>
-         </property>
-        </widget>
-       </item>
-       <item row="5" column="0">
-        <widget class="QLabel" name="label_6">
-         <property name="text">
-          <string>&amp;Round the corners of covers:</string>
-         </property>
-         <property name="buddy">
-          <cstring>opt_cover_corner_radius</cstring>
-         </property>
-        </widget>
-       </item>
-       <item row="5" column="1">
-        <layout class="QHBoxLayout" name="horizontalLayout_3">
-         <item>
-          <widget class="QSpinBox" name="opt_cover_corner_radius">
-           <property name="toolTip">
-            <string>Round the corners of covers in many places they are displayed such as the Cover grid, Book details panel, etc. Adjust the amount of rounding with this setting. A value of between 5 and 10 looks good with most covers sizes. Zero disables rounding and is the default.</string>
-           </property>
-           <property name="specialValueText">
-            <string>no rounding</string>
-           </property>
-          </widget>
-         </item>
-         <item>
-          <widget class="QComboBox" name="opt_cover_corner_radius_unit">
-           <property name="toolTip">
-            <string>The unit for the cover corner rounding. Either pixel values or as a percentage of the cover size.</string>
-           </property>
-          </widget>
-         </item>
-        </layout>
-       </item>
-       <item row="6" column="0">
-        <widget class="QCheckBox" name="opt_systray_icon">
-         <property name="text">
-          <string>Enable s&amp;ystem tray icon (needs restart)</string>
-         </property>
-        </widget>
-       </item>
-       <item row="6" column="1">
-        <widget class="QCheckBox" name="opt_disable_animations">
-         <property name="toolTip">
-          <string>Disable all animations. Useful if you have a slow/old computer.</string>
-         </property>
-         <property name="text">
-          <string>Disable &amp;animations</string>
-         </property>
-        </widget>
-       </item>
-       <item row="7" column="0">
-        <widget class="QCheckBox" name="opt_disable_tray_notification">
-         <property name="toolTip">
-          <string>Disable popup notifications when calibre completes jobs such a conversion, sending to device etc. The notifications are sent via the operating system notification facility, if available.</string>
-         </property>
-         <property name="text">
-          <string>Disable n&amp;otifications on job completion</string>
-         </property>
-        </widget>
-       </item>
-       <item row="7" column="1">
-        <widget class="QCheckBox" name="opt_show_splash_screen">
-         <property name="text">
-          <string>Show the &amp;splash screen at startup</string>
-         </property>
-        </widget>
-       </item>
-       <item row="8" column="0">
-        <widget class="QCheckBox" name="opt_book_list_tooltips">
-         <property name="text">
-          <string>Show &amp;tooltips in the book list</string>
-         </property>
-        </widget>
-       </item>
-       <item row="9" column="0">
-        <layout class="QHBoxLayout" name="horizontalLayout">
-         <item>
-          <widget class="QLabel" name="label_2">
-           <property name="text">
-            <string>&amp;Interface font:</string>
-           </property>
-           <property name="buddy">
-            <cstring>font_display</cstring>
-           </property>
-          </widget>
-         </item>
-         <item>
-          <widget class="QLineEdit" name="font_display">
-           <property name="readOnly">
-            <bool>true</bool>
-           </property>
-          </widget>
-         </item>
-        </layout>
-       </item>
-       <item row="9" column="1">
-        <widget class="QPushButton" name="change_font_button">
-         <property name="text">
-          <string>Change &amp;font (needs restart)</string>
-         </property>
-        </widget>
-       </item>
-       <item row="10" column="0">
-        <widget class="QGroupBox" name="groupBox_2">
-         <property name="title">
-          <string>Toolbar</string>
-         </property>
-         <layout class="QGridLayout" name="gridLayout_8">
-          <item row="0" column="1">
-           <widget class="QComboBox" name="opt_toolbar_icon_size"/>
-          </item>
-          <item row="0" column="0">
-           <widget class="QLabel" name="label_5">
-            <property name="text">
-             <string>Icon si&amp;ze:</string>
-            </property>
-            <property name="buddy">
-             <cstring>opt_toolbar_icon_size</cstring>
-            </property>
-           </widget>
-          </item>
-          <item row="1" column="1">
-           <widget class="QComboBox" name="opt_toolbar_text"/>
-          </item>
-          <item row="1" column="0">
-           <widget class="QLabel" name="label_8">
-            <property name="text">
-             <string>Show &amp;text under icons:</string>
-            </property>
-            <property name="buddy">
-             <cstring>opt_toolbar_text</cstring>
-            </property>
-           </widget>
-          </item>
-          <item row="2" column="0" colspan="2">
-           <widget class="QCheckBox" name="opt_wrap_toolbar_text">
-            <property name="text">
-             <string>Use t&amp;wo lines for the text under the icons (needs restart)</string>
-            </property>
-           </widget>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item row="10" column="1">
-        <widget class="QGroupBox" name="groupBox">
-         <property name="title">
-          <string>Status bar buttons</string>
-         </property>
-         <layout class="QVBoxLayout">
-          <item>
-           <widget class="QCheckBox" name="opt_show_layout_buttons">
-            <property name="toolTip">
-             <string>Show individual buttons to control the layout of the interface rather than a single button with a popup.</string>
-            </property>
-            <property name="text">
-             <string>Show &amp;layout buttons</string>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QCheckBox" name="opt_show_sb_all_actions_button">
-            <property name="toolTip">
-             <string>Show a button that gives quick access to all available actions with a single click.</string>
-            </property>
-            <property name="text">
-             <string>S&amp;how actions button</string>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <spacer name="horizontalSpacer_3">
-            <property name="orientation">
-             <enum>Qt::Vertical</enum>
-            </property>
-            <property name="sizeHint" stdset="0">
-             <size>
-              <width>10</width>
-              <height>20</height>
-             </size>
-            </property>
-           </spacer>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item row="11" column="0">
-        <widget class="QLabel" name="label_4">
-         <property name="text">
-          <string>E&amp;xtra spacing to add between rows in the book list (can be negative):</string>
-         </property>
-         <property name="buddy">
-          <cstring>opt_book_list_extra_row_spacing</cstring>
-         </property>
-        </widget>
-       </item>
-       <item row="11" column="1">
-        <widget class="QSpinBox" name="opt_book_list_extra_row_spacing">
-         <property name="suffix">
-          <string> px</string>
-         </property>
-         <property name="minimum">
-          <number>-20</number>
-         </property>
-        </widget>
-       </item>
-       <item row="12" column="0">
-        <widget class="QCheckBox" name="opt_row_numbers_in_book_list">
-         <property name="text">
-          <string>Show &amp;row numbers in the book list</string>
-         </property>
-        </widget>
-       </item>
-       <item row="13" column="0">
-        <widget class="QCheckBox" name="opt_booklist_grid">
-         <property name="text">
-          <string>Draw a &amp;grid in the book list</string>
-         </property>
-        </widget>
-       </item>
-       <item row="14" column="0">
-        <widget class="QCheckBox" name="opt_dnd_merge">
-         <property name="text">
-          <string>Allow using &amp;drag and drop to merge books</string>
-         </property>
-        </widget>
-       </item>
-       <item row="15" column="0">
-        <spacer name="verticalSpacer_3">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-      </layout>
      </widget>
      <widget class="QTabWidget" name="cover_grid_tab">
       <property name="currentIndex">
@@ -1377,6 +1030,11 @@ columns&quot;. Editing with mouse clicks and the Tab key will be disabled.&lt;/p
    <extends>QWidget</extends>
    <header>calibre/gui2/preferences/look_feel_tabs.h</header>
   </customwidget>
+  <customwidget>
+   <class>MainInterfaceTab</class>
+   <extends>ConfigWidgetBase</extends>
+   <header>calibre/gui2/preferences/look_feel_tabs/main_interface.h</header>
+  </customwidget>
   <customwidget>
    <class>TbDisplayTab</class>
    <extends>ConfigWidgetBase</extends>

src/calibre/gui2/preferences/look_feel_tabs/main_interface.py

@@ -0,0 +1,193 @@
+#!/usr/bin/env python
+
+__license__   = 'GPL v3'
+__copyright__ = '2025, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+
+from qt.core import QApplication, QDialog, QFont, QFontDialog, QFontInfo
+
+from calibre.constants import ismacos, iswindows
+from calibre.gui2 import config, gprefs, icon_resource_manager, qt_app
+from calibre.gui2.preferences import LazyConfigWidgetBase, Setting, set_help_tips
+from calibre.gui2.preferences.look_feel_tabs.main_interface_ui import Ui_Form
+from calibre.gui2.widgets import BusyCursor
+from calibre.utils.config import prefs
+from calibre.utils.localization import available_translations, get_lang, get_language
+
+
+class LanguageSetting(Setting):
+
+    def commit(self):
+        val = self.get_gui_val()
+        oldval = self.get_config_val()
+        if val != oldval:
+            gprefs.set('last_used_language', oldval)
+        return super().commit()
+
+
+class MainInterfaceTab(LazyConfigWidgetBase, Ui_Form):
+
+    def genesis(self, gui):
+        self.gui = gui
+        self.ui_style_available = True
+        if not ismacos and not iswindows:
+            self.label_widget_style.setVisible(False)
+            self.opt_ui_style.setVisible(False)
+            self.ui_style_available = False
+
+        r = self.register
+
+        try:
+            self.icon_theme_title = icon_resource_manager.user_theme_title
+        except Exception:
+            self.icon_theme_title = _('Default icons')
+        self.icon_theme.setText(_('Icon theme: <b>%s</b>') % self.icon_theme_title)
+        self.commit_icon_theme = None
+        self.icon_theme_button.clicked.connect(self.choose_icon_theme)
+
+        r('ui_style', gprefs, restart_required=True, choices=[(_('System default'), 'system'), (_('calibre style'), 'calibre')])
+        r('book_list_tooltips', gprefs)
+        r('dnd_merge', gprefs)
+        r('wrap_toolbar_text', gprefs, restart_required=True)
+        r('show_layout_buttons', gprefs)
+        r('show_sb_all_actions_button', gprefs)
+        # r('show_sb_preference_button', gprefs)
+        r('row_numbers_in_book_list', gprefs)
+        r('cover_corner_radius', gprefs)
+        r('cover_corner_radius_unit', gprefs, choices=[(_('Pixels'), 'px'), (_('Percentage'), '%')])
+        r('book_list_extra_row_spacing', gprefs)
+        r('booklist_grid', gprefs)
+
+        def get_esc_lang(l):
+            if l == 'en':
+                return 'English'
+            return get_language(l)
+
+        lang = get_lang()
+        if lang is None or lang not in available_translations():
+            lang = 'en'
+        items = [(l, get_esc_lang(l)) for l in available_translations()
+                 if l != lang]
+        if lang != 'en':
+            items.append(('en', get_esc_lang('en')))
+        items.sort(key=lambda x: x[1].lower())
+        choices = [(y, x) for x, y in items]
+        # Default language is the autodetected one
+        choices = [(get_language(lang), lang)] + choices
+        lul = gprefs.get('last_used_language')
+        if lul and (lul in available_translations() or lul in ('en', 'eng')):
+            choices.insert(1, ((get_language(lul), lul)))
+        r('language', prefs, choices=choices, restart_required=True, setting=LanguageSetting)
+
+        r('disable_animations', config)
+        r('systray_icon', config, restart_required=True)
+        r('show_splash_screen', gprefs)
+        r('disable_tray_notification', config)
+
+        choices = [(_('Off'), 'off'), (_('Small'), 'small'),
+            (_('Medium-small'), 'mid-small'), (_('Medium'), 'medium'), (_('Large'), 'large')]
+        r('toolbar_icon_size', gprefs, choices=choices)
+
+        choices = [(_('If there is enough room'), 'auto'), (_('Always'), 'always'),
+            (_('Never'), 'never')]
+        r('toolbar_text', gprefs, choices=choices)
+
+        self.current_font = self.initial_font = None
+        self.change_font_button.clicked.connect(self.change_font)
+
+        self.opt_ui_style.currentIndexChanged.connect(self.update_color_palette_state)
+        self.opt_gui_layout.addItem(_('Wide'), 'wide')
+        self.opt_gui_layout.addItem(_('Narrow'), 'narrow')
+        self.opt_gui_layout.currentIndexChanged.connect(self.changed_signal)
+        set_help_tips(self.opt_gui_layout, config.help('gui_layout'))
+        self.button_adjust_colors.clicked.connect(self.adjust_colors)
+
+    def lazy_initialize(self):
+        font = gprefs['font']
+        if font is not None:
+            font = list(font)
+            font.append(gprefs.get('font_stretch', QFont.Stretch.Unstretched))
+        self.current_font = self.initial_font = font
+        self.update_font_display()
+        self.update_color_palette_state()
+        self.opt_gui_layout.setCurrentIndex(0 if self.gui.layout_container.is_wide else 1)
+
+    def adjust_colors(self):
+        from calibre.gui2.dialogs.palette import PaletteConfig
+        d = PaletteConfig(self)
+        if d.exec() == QDialog.DialogCode.Accepted:
+            d.apply_settings()
+            self.changed_signal.emit()
+
+    def update_color_palette_state(self):
+        if self.ui_style_available:
+            enabled = self.opt_ui_style.currentData() == 'calibre'
+            self.button_adjust_colors.setEnabled(enabled)
+
+    def choose_icon_theme(self):
+        from calibre.gui2.icon_theme import ChooseTheme
+        d = ChooseTheme(self)
+        if d.exec() == QDialog.DialogCode.Accepted:
+            self.commit_icon_theme = d.commit_changes
+            self.icon_theme_title = d.new_theme_title or _('Default icons')
+            self.icon_theme.setText(_('Icon theme: <b>%s</b>') % self.icon_theme_title)
+            self.changed_signal.emit()
+
+    def build_font_obj(self):
+        font_info = qt_app.original_font if self.current_font is None else self.current_font
+        font = QFont(*(font_info[:4]))
+        font.setStretch(font_info[4])
+        return font
+
+    def change_font(self, *args):
+        fd = QFontDialog(self.build_font_obj(), self)
+        if fd.exec() == QDialog.DialogCode.Accepted:
+            font = fd.selectedFont()
+            fi = QFontInfo(font)
+            self.current_font = [str(fi.family()), fi.pointSize(),
+                    fi.weight(), fi.italic(), font.stretch()]
+            self.update_font_display()
+            self.changed_signal.emit()
+
+    def update_font_display(self):
+        font = self.build_font_obj()
+        fi = QFontInfo(font)
+        name = str(fi.family())
+
+        self.font_display.setFont(font)
+        self.font_display.setText(name + f' [{fi.pointSize()}pt]')
+
+    def commit(self):
+        rr = LazyConfigWidgetBase.commit(self)
+        with BusyCursor():
+            if self.current_font != self.initial_font:
+                gprefs['font'] = (self.current_font[:4] if self.current_font else None)
+                gprefs['font_stretch'] = (self.current_font[4] if self.current_font
+                        is not None else QFont.Stretch.Unstretched)
+                QApplication.setFont(self.font_display.font())
+                rr = True
+            if self.commit_icon_theme is not None:
+                self.commit_icon_theme()
+            self.gui.layout_container.change_layout(self.gui, self.opt_gui_layout.currentIndex() == 0)
+        return rr
+
+    def restore_defaults(self):
+        LazyConfigWidgetBase.restore_defaults(self)
+        ofont = self.current_font
+        self.current_font = None
+        if ofont is not None:
+            self.changed_signal.emit()
+            self.main_interface_tab.update_font_display()
+        self.opt_gui_layout.setCurrentIndex(0)
+        self.changed_signal.emit()
+
+    def refresh_gui(self, gui):
+        gui.place_layout_buttons()
+        self.update_font_display()
+        gui.library_view.set_row_header_visibility()
+        for view in 'library memory card_a card_b'.split():
+            getattr(gui, view + '_view').set_row_header_visibility()
+        gui.library_view.refresh_row_sizing()
+        gui.sb_all_gui_actions_button.setVisible(gprefs['show_sb_all_actions_button'])
+        # gui.sb_preferences_button.setVisible(gprefs['show_sb_preference_button'])

src/calibre/gui2/preferences/look_feel_tabs/main_interface.ui

@@ -0,0 +1,356 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Form</class>
+ <widget class="QWidget" name="main_interface_tab">
+  <layout class="QGridLayout" name="gridLayout_main_interface">
+   <item row="0" column="0">
+    <widget class="QLabel" name="label_widget_style">
+     <property name="text">
+      <string>User interface style (&amp;needs restart):</string>
+     </property>
+     <property name="buddy">
+      <cstring>opt_ui_style</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="1">
+    <widget class="QComboBox" name="opt_ui_style"/>
+   </item>
+   <item row="0" column="2">
+    <layout class="QHBoxLayout">
+     <item>
+      <spacer name="horizontalSpacer_3">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>20</width>
+         <height>1</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+   <item row="1" column="0">
+    <widget class="QLabel" name="icon_theme">
+     <property name="text">
+      <string/>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1">
+    <widget class="QPushButton" name="icon_theme_button">
+     <property name="text">
+      <string>Change &amp;icon theme</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="0">
+    <widget class="QLabel" name="opt_color_palette_label">
+     <property name="text">
+      <string>User interface &amp;colors:</string>
+     </property>
+     <property name="buddy">
+      <cstring>button_adjust_colors</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="1">
+    <widget class="QPushButton" name="button_adjust_colors">
+     <property name="text">
+      <string>Adjust &amp;colors</string>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="0">
+    <widget class="QLabel" name="label_17">
+     <property name="text">
+      <string>&amp;User interface layout:</string>
+     </property>
+     <property name="buddy">
+      <cstring>opt_gui_layout</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="1">
+    <widget class="QComboBox" name="opt_gui_layout">
+     <property name="maximumSize">
+      <size>
+       <width>250</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="sizeAdjustPolicy">
+      <enum>QComboBox::AdjustToMinimumContentsLengthWithIcon</enum>
+     </property>
+     <property name="minimumContentsLength">
+      <number>20</number>
+     </property>
+    </widget>
+   </item>
+   <item row="4" column="0">
+    <widget class="QLabel" name="label_7">
+     <property name="text">
+      <string>Choose &amp;language (needs restart):</string>
+     </property>
+     <property name="buddy">
+      <cstring>opt_language</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="4" column="1">
+    <widget class="QComboBox" name="opt_language">
+     <property name="sizeAdjustPolicy">
+      <enum>QComboBox::AdjustToMinimumContentsLengthWithIcon</enum>
+     </property>
+     <property name="minimumContentsLength">
+      <number>20</number>
+     </property>
+    </widget>
+   </item>
+   <item row="5" column="0">
+    <widget class="QLabel" name="label_6">
+     <property name="text">
+      <string>&amp;Round the corners of covers:</string>
+     </property>
+     <property name="buddy">
+      <cstring>opt_cover_corner_radius</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="5" column="1">
+    <layout class="QHBoxLayout" name="horizontalLayout_3">
+     <item>
+      <widget class="QSpinBox" name="opt_cover_corner_radius">
+       <property name="toolTip">
+        <string>Round the corners of covers in many places they are displayed such as the Cover grid, Book details panel, etc. Adjust the amount of rounding with this setting. A value of between 5 and 10 looks good with most covers sizes. Zero disables rounding and is the default.</string>
+       </property>
+       <property name="specialValueText">
+        <string>no rounding</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="opt_cover_corner_radius_unit">
+       <property name="toolTip">
+        <string>The unit for the cover corner rounding. Either pixel values or as a percentage of the cover size.</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="6" column="0">
+    <widget class="QCheckBox" name="opt_systray_icon">
+     <property name="text">
+      <string>Enable s&amp;ystem tray icon (needs restart)</string>
+     </property>
+    </widget>
+   </item>
+   <item row="6" column="1">
+    <widget class="QCheckBox" name="opt_disable_animations">
+     <property name="toolTip">
+      <string>Disable all animations. Useful if you have a slow/old computer.</string>
+     </property>
+     <property name="text">
+      <string>Disable &amp;animations</string>
+     </property>
+    </widget>
+   </item>
+   <item row="7" column="0">
+    <widget class="QCheckBox" name="opt_disable_tray_notification">
+     <property name="toolTip">
+      <string>Disable popup notifications when calibre completes jobs such a conversion, sending to device etc. The notifications are sent via the operating system notification facility, if available.</string>
+     </property>
+     <property name="text">
+      <string>Disable n&amp;otifications on job completion</string>
+     </property>
+    </widget>
+   </item>
+   <item row="7" column="1">
+    <widget class="QCheckBox" name="opt_show_splash_screen">
+     <property name="text">
+      <string>Show the &amp;splash screen at startup</string>
+     </property>
+    </widget>
+   </item>
+   <item row="8" column="0">
+    <widget class="QCheckBox" name="opt_book_list_tooltips">
+     <property name="text">
+      <string>Show &amp;tooltips in the book list</string>
+     </property>
+    </widget>
+   </item>
+   <item row="9" column="0">
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>&amp;Interface font:</string>
+       </property>
+       <property name="buddy">
+        <cstring>font_display</cstring>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLineEdit" name="font_display">
+       <property name="readOnly">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="9" column="1">
+    <widget class="QPushButton" name="change_font_button">
+     <property name="text">
+      <string>Change &amp;font (needs restart)</string>
+     </property>
+    </widget>
+   </item>
+   <item row="10" column="0">
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Toolbar</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_8">
+      <item row="0" column="1">
+       <widget class="QComboBox" name="opt_toolbar_icon_size"/>
+      </item>
+      <item row="0" column="0">
+       <widget class="QLabel" name="label_5">
+        <property name="text">
+         <string>Icon si&amp;ze:</string>
+        </property>
+        <property name="buddy">
+         <cstring>opt_toolbar_icon_size</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QComboBox" name="opt_toolbar_text"/>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label_8">
+        <property name="text">
+         <string>Show &amp;text under icons:</string>
+        </property>
+        <property name="buddy">
+         <cstring>opt_toolbar_text</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="0" colspan="2">
+       <widget class="QCheckBox" name="opt_wrap_toolbar_text">
+        <property name="text">
+         <string>Use t&amp;wo lines for the text under the icons (needs restart)</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item row="10" column="1">
+    <widget class="QGroupBox" name="groupBox">
+     <property name="title">
+      <string>Status bar buttons</string>
+     </property>
+     <layout class="QVBoxLayout">
+      <item>
+       <widget class="QCheckBox" name="opt_show_layout_buttons">
+        <property name="toolTip">
+         <string>Show individual buttons to control the layout of the interface rather than a single button with a popup.</string>
+        </property>
+        <property name="text">
+         <string>Show &amp;layout buttons</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="opt_show_sb_all_actions_button">
+        <property name="toolTip">
+         <string>Show a button that gives quick access to all available actions with a single click.</string>
+        </property>
+        <property name="text">
+         <string>S&amp;how actions button</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer_3">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>10</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item row="11" column="0">
+    <widget class="QLabel" name="label_4">
+     <property name="text">
+      <string>E&amp;xtra spacing to add between rows in the book list (can be negative):</string>
+     </property>
+     <property name="buddy">
+      <cstring>opt_book_list_extra_row_spacing</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="11" column="1">
+    <widget class="QSpinBox" name="opt_book_list_extra_row_spacing">
+     <property name="suffix">
+      <string> px</string>
+     </property>
+     <property name="minimum">
+      <number>-20</number>
+     </property>
+    </widget>
+   </item>
+   <item row="12" column="0">
+    <widget class="QCheckBox" name="opt_row_numbers_in_book_list">
+     <property name="text">
+      <string>Show &amp;row numbers in the book list</string>
+     </property>
+    </widget>
+   </item>
+   <item row="13" column="0">
+    <widget class="QCheckBox" name="opt_booklist_grid">
+     <property name="text">
+      <string>Draw a &amp;grid in the book list</string>
+     </property>
+    </widget>
+   </item>
+   <item row="14" column="0">
+    <widget class="QCheckBox" name="opt_dnd_merge">
+     <property name="text">
+      <string>Allow using &amp;drag and drop to merge books</string>
+     </property>
+    </widget>
+   </item>
+   <item row="15" column="0">
+    <spacer name="verticalSpacer_3">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <resources>
+  <include location="../../../../resources/images.qrc"/>
+ </resources>
+</ui>