Python Pyglet mouse events don't call on_draw() nor make changes in window

Question

for some reason, any mouse event that happens with my program doesn't make the image in the window disappear nor reappear, although my on_key_press() function works.

I've tried state flags and declaring a new image resource, but it doesn't change anything in the window.

Is there a way to make this work? Should I revert to a previous pyglet version? If so, which version?

Here's my code of the program; it runs with the test image visible, and every time a key is pressed or the mouse is clicked, the image will disappear or reappear:

import pyglet

window = pyglet.window.Window()

image = pyglet.resource.image('test.png')
image.anchor_x = image.width // 2
image.anchor_y = image.height // 2

state = True


@window.event
def on_draw():
    print('on_draw() called')
    window.clear()
    if state:
        image.blit(window.width // 2, window.height // 2)


@window.event
def on_mouse_press(x, y, button, modifiers):
    global state, image
    if button == pyglet.window.mouse.LEFT:
        print('mouse press')
        if state:
            state = False
        else:
            state = True


@window.event
def on_key_press(symbol, modifiers):
    global state
    print('key press')
    if state:
        state = False
    else:
        state = True


pyglet.app.run()

Thanks!

Edit: My python version is 3.7.2 and my pyglet version is 1.4.7, and I use pycharm, if the fact seems to factor in...

Answer 1

It seems to be an issue with the decorator function.

As Torxed suggested, instead of decorating on_mouse_press, replace the window object's on_mouse_press function with your own declaration of that function:

import pyglet


image = pyglet.resource.image('test.png')
image.anchor_x = image.width // 2
image.anchor_y = image.height // 2

state = True


def on_draw():
    print('on_draw() called')
    window.clear()
    if state:
        image.blit(window.width // 2, window.height // 2)


def on_mouse_press(x, y, button, modifiers):
    global state
    print('mouse pressed')
    if state:
        state = False
    else:
        state = True


window = pyglet.window.Window()
window.on_draw = on_draw
window.on_mouse_press = on_mouse_press

pyglet.app.run()

Otherwise, create a subclass of the Window object and override the on_mouse_press function with your own declaration:

import pyglet

class Window(pyglet.window.Window):
    def __init__(self, *args, **kwargs):
        super().__init__(800, 600)
        self.image = pyglet.resource.image('test.png')

        self.image = pyglet.resource.image('test.png')
        self.image.anchor_x = self.image.width // 2
        self.image.anchor_y = self.image.height // 2

        self.state = True

    def on_draw(self):
        print('on_draw() called')
        window.clear()
        if self.state:
            self.image.blit(self.width // 2, self.height // 2)

    def on_mouse_press(self, x, y, button, modifiers):
        print('mouse pressed')
        if self.state:
            self.state = False
        else:
            self.state = True


window = Window()

pyglet.app.run()