问题
I've added placeholder on Entry object:
self._widget = Gtk.Entry()
self._widget.set_placeholder_text("Enter your name")
Now I want to add placeholder on TextView object, but I didn't find any method for it:
self._widget = Gtk.TextView()
回答1:
You should connect to focus-in-event and focus-out-event. If the text buffer is empty on focus-out-event, set a placeholder flag to true, add the placeholder text, and add a CSS class that you can optionally use to style the placeholder text gray. If the placeholder flag is true on focus-in-event, empty the text buffer, and remove the CSS class.
来源：https://stackoverflow.com/questions/44715457/how-to-add-placeholder-on-textview-object-in-pygobject