Gtk.Button有任何事件可以在按下按钮时重复执行代码吗？

Question

Gtk.Button有任何事件可以在按下按钮时重复执行代码吗？

让我们用下面的代码编写Python 3并使用PyGObject.当用户按住鼠标左键按钮(点击并按住)时,我想在屏幕上重复打印"Hi"消息.

我可以使用任何其他事件而不是点击或任何其他解决方案？谢谢.

from gi.repository import Gtk

class Window(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self)
        self.button = Gtk.Button("Hi Printer")
        self.button.connect("clicked", self.on_button_clicked)
        self.add(self.button)
        self.connect("delete-event", Gtk.main_quit)
    def on_button_clicked(self, widget):
        print("Hi")

window = Window()
window.show_all()
Gtk.main()

Answer 1

改编自tcaswell编辑的答案,但print_hi()在按钮释放后避免额外的呼叫:

from gi.repository import Gtk, GObject

class Window(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self)
        self.button = Gtk.Button("Hi Printer")
        self.button.connect("pressed", self.on_button_clicked)
        self.button.connect("released", self.on_button_released)
        self.add(self.button)
        self.connect("delete-event", Gtk.main_quit)

    def on_button_clicked(self, widget):
        # kick off time out
        timeout = 50
        self._timeout_id = GObject.timeout_add(timeout, self.print_hi)

    def on_button_released(self, widget):
        # remove timeout
        GObject.source_remove(self._timeout_id)
        self._timeout_id = 0 # better safe than sorry

    def print_hi(self):
        print 'hi'
        # repeat until the source is removed
        return True

window = Window()
window.show_all()
Gtk.main()