PYGLET – Dispatching Window Events

In this article we will see how we can dispatch window events in PYGLET module in python. Pyglet is easy to use but powerful library for developing visually rich GUI applications like games, multimedia etc. A window is a “heavyweight” object occupying operating system resources. Windows may appear as floating regions or can be set to fill an entire screen (fullscreen). Dispatching window events means to poll the operating system event queue for new events and call attached event handlers. This method is provided for legacy applications targeting pyglet 1.0, and advanced applications that must integrate their event loop into another framework.
We can create a window with the help of command given below 

 pyglet.window.Window(width, height, title)

In order to create window we use dispatch_events method with the window object 
Syntax : window.dispatch_events()
Argument : It takes no argument
Return : It returns None 

Below is the implementation 

Python3

# importing pyglet module
import pyglet
import pyglet.window.key

# width of window
width = 500

# height of window
height = 500

# caption i.e title of the window
title = "Geeksforgeeks"

# creating a window
window = pyglet.window.Window(width, height, title)

# text
text = "GeeksforGeeks"

# creating a label with font = times roman
# font size = 36
# aligning it to the center
label = pyglet.text.Label(text,
                          font_name ='Times New Roman',
                          font_size = 36,
                          x = window.width//2, y = window.height//2,
                          anchor_x ='center', anchor_y ='center')

# on draw event
@window.event
def on_draw():

    # clearing the window
    window.clear()

    # drawing the label on the window
    label.draw()


# key press event
@window.event
def on_key_press(symbol, modifier):

    # key "E" get press
    if symbol == pyglet.window.key.E:

        # close the window
        window.close()

# dispatching window events
window.dispatch_events()

# start running the application
pyglet.app.run()

Output :