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我想在鼠标位置画一些点（点击鼠标）

我在开罗使用 Python

我已经编写了一些代码，但效果不佳（单击按钮时我看到了要点）。

我使用 Glade 制作了 GUI，这也在问题的末尾链接。

import os,sys,platform
    from os.path import join
    import cairo
    import gi

    class Interface:
        __gtype_name__ = "MonNom"

        def __init__(self):

            file_path = os.path.join('Interface.glade')
            interface = Gtk.Builder()
            interface.add_from_file(file_path)
            self.double_buffer = None
            interface.connect_signals(self)
            window = interface.get_object("window")            
            window.show_all()

        def on_draw(self, widget, cr):
            if self.double_buffer is not None:
                cr.set_source_surface(self.double_buffer, 0, 0)
                cr.paint()
            else:
                print('Invalid double buffer')
            return False

        def on_configure(self, widget, event, data=None):
            if self.double_buffer is not None:
                self.double_buffer.finish()
                self.double_buffer = None

            self.double_buffer = cairo.ImageSurface(cairo.FORMAT_ARGB32, 600,400)

            db = self.double_buffer
            cc = cairo.Context(db)
            cc.set_source_rgb(0,0, 0)
            cc.rectangle(0, 0, 600, 400)
            cc.set_source_rgb(1, 0, 0)
            cc.stroke()
            db.flush()
            return False

        def on_da_button_press(self, widget, event):
            print ("Mouse clicked... at ", event.x, ", ", event.y)
            # self.widget.queue_draw()
            db = self.double_buffer
            if db is not None:
                cc = cairo.Context(db)
                cc.move_to(event.x-5,event.y)
                cc.line_to(event.x+5,event.y)
                cc.move_to(event.x, event.y-5)
                cc.line_to(event.x, event.y+5)
                cc.set_source_rgb(0, 1, 0)
                cc.stroke()
                # db.flush()
            return True                 

        def on_destroy(self, widget):
            Gtk.main_quit()

    if __name__ == "__main__":
        app = Interface()
        Gtk.main()

林间空地文件

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