Pyglet doesn't capture any keypresses by default, but I usually just add 
the additional events like so:
@window.event
def on_key_press(key, mod):
    if key == pyglet.window.key.ENTER and mod == pyglet.window.key.MOD_ALT: 
        ......
        ......

        if window.fullscreen is True:
            window.set_fullscreen(fullscreen=False)
        else:
            window.set_fullscreen(fullscreen=True)





On Monday, January 9, 2017 at 8:18:53 AM UTC+9, Charles wrote:
>
> It's been a while since I have been able to program again, however I just 
> tried this and the alt tab combination is not actually registered by pyglet 
> (Windows 7).
>
> On Saturday, December 3, 2016 at 4:46:37 PM UTC-6, [email protected] 
> wrote:
>>
>> What you can do is capture the alt-tab keys and use 
>> window.set_fullscreen(False) to return to the desktops native resolution, 
>> then you could use window.minimize() to miminize it to the task bar or just 
>> leave it around. I've tried a few other approaches using 
>> window.on_activate() and window.on_deactivate() for when the window gains 
>> and looses focus, though I found the results were a little janky when it 
>> came to scaling properly, others may be able to get better results. As it 
>> stands in my current example when you tab back the window won't be in 
>> fullscreen mode, but a simple alt+enter solves that. Example:
>>
>> import pyglet
>> from pyglet.window import key
>> from pyglet.gl import *
>>
>> class example(pyglet.window.Window):
>>     def __init__(self):
>>         super(example, self).__init__(640, 480, resizable=False, 
>> fullscreen=True, caption="Test")
>>         self.clear()
>>
>>     #fullscreen aspect ratio
>>         self.aspect = [self.width/640.0,self.height/480.0]
>>
>>         pyglet.clock.get_fps()
>>         self.fps_display = pyglet.clock.ClockDisplay()
>>
>>         pyglet.clock.schedule_interval(self.update, .01)
>>
>>
>>     def update(self,dt):
>>     #draw screen
>>         self.draw()
>>
>>
>>     def draw(self):
>>         self.clear()
>>         self.fps_display.draw()
>>       
>>
>>     def on_key_press(self,symbol,modifiers):
>>         if symbol == key.ESCAPE:
>>             self.close()
>>     #fullscreen toggle
>>         if symbol == key.ENTER:
>>             if modifiers & key.MOD_ALT:
>>             #if fullscreen off, turn on and scale the screen
>>                 if self.fullscreen == False:
>>                     window.set_fullscreen(True)
>>                     
>> glScalef(window.width/640.0,window.height/480.0,1.0)#2.25x, 
>> 1.875y
>>                     self.aspect[0] = window.width/640.0
>>                     self.aspect[1] = window.height/480.0
>>                     print 'PONG',self.aspect
>>             #if its on, turn it off and un-scale the screen
>>                 else:
>>                     window.set_fullscreen(False)
>>                     glScalef((window.width/640.0)/self.aspect[0],(window.
>> height/480.0)/self.aspect[1],1.0)
>>
>>     #tab out of fullsceen
>>         if symbol == key.TAB:
>>             if modifiers & key.MOD_ALT:
>>                 if self.fullscreen == True:
>>                     window.set_fullscreen(False)
>>                     glScalef((window.width/640.0)/self.aspect[0],(window.
>> height/480.0)/self.aspect[1],1.0)
>>                     self.minimize()
>>
>>
>> if __name__ == '__main__':
>>     window = example()
>>     pyglet.app.run()
>>
>>
>>
>>

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