E-book viewer: Allow scrolling of the ToC, highlights, bookmarks, etc. with touch gestures. Fixes #1963875 [Make the Viewer TOC touch friendly](https://bugs.launchpad.net/calibre/+bug/1963875)

src/calibre/gui2/actions/add.py

@@ -30,8 +30,9 @@
 
 
 def get_filters():
+    archives = ['zip', 'rar']
     return [
-            (_('Books'), BOOK_EXTENSIONS),
+            (_('Books'), [x for x in BOOK_EXTENSIONS if x not in archives]),
             (_('EPUB books'), ['epub', 'kepub']),
             (_('Kindle books'), ['mobi', 'prc', 'azw', 'azw3', 'kfx', 'tpz', 'azw1', 'azw4']),
             (_('PDF books'), ['pdf', 'azw4']),
@@ -39,7 +40,7 @@ def get_filters():
             (_('LIT books'), ['lit']),
             (_('Text books'), ['txt', 'text', 'rtf', 'md', 'markdown', 'textile', 'txtz']),
             (_('Comics'), ['cbz', 'cbr', 'cbc']),
-            (_('Archives'), ['zip', 'rar']),
+            (_('Archives'), archives),
             (_('Wordprocessor files'), ['odt', 'doc', 'docx']),
     ]
 

src/calibre/gui2/viewer/bookmarks.py

@@ -5,9 +5,9 @@
 import json
 from operator import itemgetter
 from qt.core import (
-    QAction, QComboBox, QGridLayout, QHBoxLayout, QIcon, QInputDialog,
-    QItemSelectionModel, QLabel, QListWidget, QListWidgetItem, QPushButton, Qt,
-    QWidget, pyqtSignal
+    QAbstractItemView, QAction, QComboBox, QGridLayout, QHBoxLayout, QIcon,
+    QInputDialog, QItemSelectionModel, QLabel, QListWidget, QListWidgetItem,
+    QPushButton, QScroller, Qt, QWidget, pyqtSignal
 )
 
 from calibre.gui2 import choose_files, choose_save_file
@@ -32,6 +32,8 @@ def __init__(self, parent=None):
         self.addAction(ac)
         self.ac_delete = ac = QAction(QIcon(I('trash.png')), _('Remove this bookmark'), self)
         self.addAction(ac)
+        QScroller.grabGesture(self.viewport(), QScroller.ScrollerGestureType.TouchGesture)
+        self.setVerticalScrollMode(QAbstractItemView.ScrollMode.ScrollPerPixel)
 
     @property
     def current_non_removed_item(self):

src/calibre/gui2/viewer/highlights.py

@@ -10,7 +10,7 @@
     QAbstractItemView, QColor, QDialog, QFont, QHBoxLayout, QIcon, QImage,
     QItemSelectionModel, QKeySequence, QLabel, QMenu, QPainter, QPainterPath,
     QPalette, QPixmap, QPushButton, QRect, QSizePolicy, QStyle, Qt, QTextCursor,
-    QTextEdit, QTreeWidget, QTreeWidgetItem, QVBoxLayout, QWidget, pyqtSignal
+    QTextEdit, QTreeWidget, QTreeWidgetItem, QVBoxLayout, QWidget, pyqtSignal, QScroller
 )
 
 from calibre.constants import (
@@ -175,6 +175,8 @@ def __init__(self, parent=None):
         self.uuid_map = {}
         self.section_font = QFont(self.font())
         self.section_font.setItalic(True)
+        QScroller.grabGesture(self.viewport(), QScroller.ScrollerGestureType.TouchGesture)
+        self.setVerticalScrollMode(QAbstractItemView.ScrollMode.ScrollPerPixel)
 
     def show_context_menu(self, point):
         index = self.indexAt(point)

src/calibre/gui2/viewer/search.py

@@ -6,8 +6,9 @@
 from collections import Counter, OrderedDict
 from html import escape
 from qt.core import (
-    QCheckBox, QComboBox, QFont, QHBoxLayout, QIcon, QLabel, Qt, QToolButton,
-    QTreeWidget, QTreeWidgetItem, QVBoxLayout, QWidget, pyqtSignal
+    QAbstractItemView, QCheckBox, QComboBox, QFont, QHBoxLayout, QIcon, QLabel,
+    QScroller, Qt, QToolButton, QTreeWidget, QTreeWidgetItem, QVBoxLayout, QWidget,
+    pyqtSignal
 )
 from threading import Thread
 
@@ -471,6 +472,8 @@ def __init__(self, parent=None):
         self.section_map = {}
         self.search_results = []
         self.item_map = {}
+        QScroller.grabGesture(self.viewport(), QScroller.ScrollerGestureType.TouchGesture)
+        self.setVerticalScrollMode(QAbstractItemView.ScrollMode.ScrollPerPixel)
 
     def current_item_changed(self, current, previous):
         if current is not None:

src/calibre/gui2/viewer/toc.py

@@ -4,11 +4,10 @@
 
 import re
 from functools import partial
-
 from qt.core import (
-    QApplication, QFont, QHBoxLayout, QIcon, QMenu, QModelIndex, QStandardItem,
-    QStandardItemModel, QStyledItemDelegate, Qt, QToolButton, QToolTip, QTreeView,
-    QWidget, pyqtSignal, QEvent
+    QAbstractItemView, QApplication, QEvent, QFont, QHBoxLayout, QIcon, QMenu,
+    QModelIndex, QScroller, QStandardItem, QStandardItemModel, QStyledItemDelegate,
+    Qt, QToolButton, QToolTip, QTreeView, QWidget, pyqtSignal
 )
 
 from calibre.gui2 import error_dialog
@@ -48,6 +47,8 @@ def __init__(self, *args):
         self.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
         self.customContextMenuRequested.connect(self.context_menu)
         QApplication.instance().palette_changed.connect(self.set_style_sheet, type=Qt.ConnectionType.QueuedConnection)
+        QScroller.grabGesture(self.viewport(), QScroller.ScrollerGestureType.TouchGesture)
+        self.setVerticalScrollMode(QAbstractItemView.ScrollMode.ScrollPerPixel)
 
     def setModel(self, model):
         QTreeView.setModel(self, model)