Nicer event debugging

src/calibre/gui2/__init__.py

@@ -1260,6 +1260,13 @@ _df = os.environ.get('CALIBRE_DEVELOP_FROM', None)
 if _df and os.path.exists(_df):
     build_forms(_df, check_for_migration=True)
 
+def event_type_name(ev_or_etype):
+    from PyQt5.QtCore import QEvent
+    etype = ev_or_etype.type() if isinstance(ev_or_etype, QEvent) else ev_or_etype
+    for name, num in vars(QEvent).iteritems():
+        if num == etype:
+            return name
+    return 'UnknownEventType'
 
 if islinux or isbsd:
     def workaround_broken_under_mouse(ch):

src/calibre/gui2/complete2.py

@@ -10,7 +10,7 @@ __docformat__ = 'restructuredtext en'
 import weakref
 
 import sip
-from PyQt5.Qt import (QLineEdit, QAbstractListModel, Qt, pyqtSignal, QObject,
+from PyQt5.Qt import (QLineEdit, QAbstractListModel, Qt, pyqtSignal, QObject, QKeySequence,
         QApplication, QListView, QPoint, QModelIndex, QFont, QFontInfo, QTimer)
 
 from calibre.constants import isosx, get_osx_version
@@ -191,6 +191,12 @@ class Completer(QListView):  # {{{
                 self.setFont(f)
             p.show()
 
+    def debug_event(self, ev):
+        from calibre.gui2 import event_type_name
+        print ('Event:', event_type_name(ev))
+        if ev.type() in (ev.KeyPress, ev.ShortcutOverride, ev.KeyRelease):
+            print ('\tkey:', QKeySequence(ev.key()).toString())
+
     def eventFilter(self, obj, e):
         'Redirect key presses from the popup to the widget'
         widget = self.completer_widget()
@@ -200,6 +206,8 @@ class Completer(QListView):  # {{{
         if obj is not self:
             return QObject.eventFilter(self, obj, e)
 
+        # self.debug_event(e)
+
         if etype == e.KeyPress:
             key = e.key()
             if key == Qt.Key_Escape:
@@ -245,7 +253,7 @@ class Completer(QListView):  # {{{
             if e.isAccepted():
                 return True
         elif isosx and etype == e.InputMethodQuery and e.queries() == (Qt.ImHints | Qt.ImEnabled) and self.isVisible():
-            # In Qt 5 the Esc key cause this event and the line edit does not
+            # In Qt 5 the Esc key causes this event and the line edit does not
             # handle it, which causes the parent dialog to be closed
             # See https://bugreports.qt-project.org/browse/QTBUG-41806
             e.accept()