void FixLanguageSelectionAttributes()
{
// BUG in WPF: When entering text from a different language (or direction) than the current selection,
// we lose all selection formatting.
// By setting the language to match the input language, we don't lose selection formatting when entering text
// This has a concequence where the spellcheck language will always match the input language, not the language
// set for the operating system. Fortunately, this is probably a good thing.
// only track changes to language when we have focus.
Control.GotKeyboardFocus += (sender, e) =>
{
if (_languageChangedListener == null)
{
_languageChangedListener = new LanguageChangedListener(this, swi.InputLanguageManager.Current);
}
};
Control.LostKeyboardFocus += (sender, e) =>
{
_languageChangedListener?.Dispose();
_languageChangedListener = null;
};
// Bug in WPF: When using composition (IME), it doesn't use the selection attributes when inserting the text
// so, we apply selection attributes to the composition range while composing.
swi.TextCompositionManager.AddPreviewTextInputStartHandler(Control, OnPreviewTextInputStart);
swi.TextCompositionManager.AddPreviewTextInputUpdateHandler(Control, OnPreviewTextInputUpdate);
swi.TextCompositionManager.AddPreviewTextInputHandler(Control, OnPreviewTextInput);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
_languageChangedListener?.Dispose();
_languageChangedListener = null;
}
base.Dispose(disposing);
}
