Enhancement #1899316: Add the context menu to the Category editor

src/calibre/gui2/dialogs/tag_list_editor.py

@@ -3,9 +3,11 @@
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
 
 
+from functools import partial
+
 from PyQt5.Qt import (Qt, QDialog, QTableWidgetItem, QIcon, QByteArray, QSize,
                       QDialogButtonBox, QTableWidget, QItemDelegate, QApplication,
-                      pyqtSignal, QAction, QFrame, QLabel, QTimer)
+                      pyqtSignal, QAction, QFrame, QLabel, QTimer, QMenu)
 
 from calibre.gui2.dialogs.tag_list_editor_ui import Ui_TagListEditor
 from calibre.gui2.complete2 import EditWithComplete
@@ -249,6 +251,85 @@ class TagListEditor(QDialog, Ui_TagListEditor):
         self.search_item_row = -1
         self.fill_in_table(None, tag_to_match, ttm_is_first_letter)
 
+        self.table.setContextMenuPolicy(Qt.CustomContextMenu)
+        self.table.customContextMenuRequested.connect(self.show_context_menu)
+
+    def show_context_menu(self, point):
+        idx = self.table.indexAt(point)
+        if idx.column() != 0:
+            return
+        m = self.au_context_menu = QMenu(self)
+
+        item = self.table.itemAt(point)
+        disable_copy_paste = len(self.table.selectedItems()) != 1 or item.is_deleted
+        ca = m.addAction(_('Copy'))
+        ca.triggered.connect(partial(self.copy_to_clipboard, item))
+        if disable_copy_paste:
+            ca.setEnabled(False)
+        ca = m.addAction(_('Paste'))
+        ca.triggered.connect(partial(self.paste_from_clipboard, item))
+        if disable_copy_paste:
+            ca.setEnabled(False)
+        ca = m.addAction(_('Undo'))
+        ca.triggered.connect(self.undo_edit)
+        ca.setEnabled(False)
+        for item in self.table.selectedItems():
+            if (item.text() != self.original_names[int(item.data(Qt.UserRole))]
+                     or item.is_deleted):
+                ca.setEnabled(True)
+                break
+        ca = m.addAction(_('Edit'))
+        ca.triggered.connect(self.rename_tag)
+        ca = m.addAction(_('Delete'))
+        ca.triggered.connect(self.delete_tags)
+        m.addSeparator()
+        case_menu = QMenu(_('Change case'))
+        action_upper_case = case_menu.addAction(_('Upper case'))
+        action_lower_case = case_menu.addAction(_('Lower case'))
+        action_swap_case = case_menu.addAction(_('Swap case'))
+        action_title_case = case_menu.addAction(_('Title case'))
+        action_capitalize = case_menu.addAction(_('Capitalize'))
+        action_upper_case.triggered.connect(partial(self.do_case, self.upper_case))
+        action_lower_case.triggered.connect(partial(self.do_case, self.lower_case))
+        action_swap_case.triggered.connect(partial(self.do_case, self.swap_case))
+        action_title_case.triggered.connect(partial(self.do_case, self.title_case))
+        action_capitalize.triggered.connect(partial(self.do_case, self.capitalize))
+        m.addMenu(case_menu)
+        m.exec_(self.table.mapToGlobal(point))
+
+    def copy_to_clipboard(self, item):
+        cb = QApplication.clipboard()
+        cb.setText(unicode_type(item.text()))
+
+    def paste_from_clipboard(self, item):
+        cb = QApplication.clipboard()
+        item.setText(cb.text())
+
+    def do_case(self, func):
+        items = self.table.selectedItems()
+        # block signals to avoid the "edit one changes all" behavior
+        self.table.blockSignals(True)
+        for item in items:
+            func(item)
+        self.table.blockSignals(False)
+
+    def upper_case(self, item):
+        item.setText(icu_upper(unicode_type(item.text())))
+
+    def lower_case(self, item):
+        item.setText(icu_lower(unicode_type(item.text())))
+
+    def swap_case(self, item):
+        item.setText(unicode_type(item.text()).swapcase())
+
+    def title_case(self, item):
+        from calibre.utils.titlecase import titlecase
+        item.setText(titlecase(unicode_type(item.text())))
+
+    def capitalize(self, item):
+        from calibre.utils.icu import capitalize
+        item.setText(capitalize(unicode_type(item.text())))
+
     def vl_box_changed(self):
         self.search_item_row = -1
         self.fill_in_table(None, None, False)
@@ -449,18 +530,21 @@ class TagListEditor(QDialog, Ui_TagListEditor):
             error_dialog(self, _('No item selected'),
                          _('You must select one item from the list of Available items.')).exec_()
             return
-        col_zero_item = self.table.item(item.row(), 0)
+        for col_zero_item in self.table.selectedItems():
             if col_zero_item.is_deleted:
-            if not question_dialog(self, _('Undelete item?'),
+                if not question_dialog(self, _('Undelete items?'),
-                   '<p>'+_('That item is deleted. Do you want to undelete it?')+'<br>'):
+                       '<p>'+_('Items must be undeleted to continue. Do you want '
+                               'to do this?')+'<br>'):
                     return
+        self.table.blockSignals(True)
+        for col_zero_item in self.table.selectedItems():
+            # undelete any deleted items
+            if col_zero_item.is_deleted:
                 col_zero_item.set_is_deleted(False)
                 self.to_delete.discard(int(col_zero_item.data(Qt.UserRole)))
                 orig = self.table.item(col_zero_item.row(), 2)
-            self.table.blockSignals(True)
                 orig.setData(Qt.DisplayRole, '')
         self.table.blockSignals(False)
-        else:
         self.table.editItem(item)
 
     def delete_pressed(self):