Add ability to open a dialog box containing the cell's tooltip. This makes tooltips more accessible to people who primarily use the keyboard. A shortcut can be defined but none is set by default.

Also a few string changes.

src/calibre/gui2/actions/column_tooltips.py

@@ -2,9 +2,12 @@
 # License: GPLv3 Copyright: 2022, Charles Haley
 #
 
+from qt.core import Qt, QDialogButtonBox, QVBoxLayout
+
 from calibre.gui2 import error_dialog
 from calibre.gui2.actions import InterfaceAction
 from calibre.gui2.dialogs.template_dialog import TemplateDialog
+from calibre.gui2.widgets2 import Dialog, HTMLDisplay
 
 
 def column_template_placeholder_text():
@@ -12,37 +15,84 @@ def column_template_placeholder_text():
             'Notes:\n'
             '• The template global variable "{0}" contains the column lookup name.\n'
             '• The global variable "{1}" contains the original tooltip text').format('column_lookup_name',
-
                                                                                      'original_text')
 
 
+class ToolTipDialog(Dialog):
+
+    def __init__(self, title, prefs):
+        super().__init__(title, 'show_tooltip_dialog',
+                         prefs = prefs,
+                         default_buttons=QDialogButtonBox.StandardButton.Ok)
+
+    def setup_ui(self):
+        l = QVBoxLayout(self)
+        d = self.display = HTMLDisplay()
+        l.addWidget(d)
+        l.addWidget(self.bb)
+
+    def set_html(self, tt_text):
+        self.display.setHtml(tt_text)
+
+
 class ColumnTooltipsAction(InterfaceAction):
 
     name = 'Column tooltips'
     action_spec = (_('Column tooltips'), 'edit_input.png',
                    _('Define a custom tooltip for values in a column'), ())
     action_type = 'current'
+    action_add_menu = True
+    action_menu_clone_qaction = _('Edit/define column tooltip')
     dont_add_to = frozenset(('context-menu-device', 'menubar-device'))
 
     def genesis(self):
         self.qaction.triggered.connect(self.show_template_editor)
+        m = self.qaction.menu()
+        ac = self.create_menu_action(m, 'tooltip_in_dialog_box', _('Show item tooltip in a dialog'),
+            icon='dialog_information.png', triggered=self.show_tooltip_in_dialog, shortcut=None)
+        m.addAction(ac)
 
-    def show_template_editor(self):
+    def check_errors(self, only_one_row=False):
         view = self.gui.current_view()
         if view is not self.gui.library_view:
-            return error_dialog(self.gui, _('No template tester available'),
-                _('Template tester is not available for books '
-                  'on the device.')).exec()
-
+            error_dialog(self.gui, _('No library view available'),
+                _("You can't set custom tooltips for books on the device.")).exec()
+            return (None, None, None, None)
         idx = view.currentIndex()
         if not idx.isValid():
-            return error_dialog(self.gui, _('No column selected'),
+            error_dialog(self.gui, _('No column selected'),
                     _('A column (cell) must be selected'), show=True)
+            return (None, None, None, None)
         column = view.model().column_map[idx.column()]
         rows = view.selectionModel().selectedRows()
         if not rows:
-            return error_dialog(self.gui, _('No books selected'),
+            error_dialog(self.gui, _('No books selected'),
                     _('At least one book must be selected'), show=True)
+            return (None, None, None, None)
+        if only_one_row and len(rows) != 1:
+            error_dialog(self.gui, _('Only one book'),
+                    _('Only one book can be selected'), show=True)
+            return (None, None, None, None)
+        return view, idx, column, rows
+
+    def show_tooltip_in_dialog(self):
+        view, idx, column, rows = self.check_errors(only_one_row=True)
+        if view is None:
+            return
+        from calibre.gui2.ui import get_gui
+        db = get_gui().current_db.new_api
+        fm = db.field_metadata.get(column)
+        col_name = fm['name']
+        d = ToolTipDialog(
+            _('Tooltip for column {name}, row {row_num}').format(name=col_name, row_num=rows[0].row()+1),
+            prefs=db.backend.prefs)
+        d.set_html(idx.data(Qt.ItemDataRole.ToolTipRole))
+        d.exec()
+
+    def show_template_editor(self):
+        view, _, column, rows = self.check_errors()
+        if view is None:
+            return
         mi = []
         db = view.model().db
         for row in rows: