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PYGLET – On Mouse Scroll Event
  • Last Updated : 22 Sep, 2020

In this article we will see how we can trigger on mouse scroll event 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).This event get called when the mouse wheel was scrolled. Note that most mice have only a vertical scroll wheel, so scroll_x is usually 0. An exception to this is the Apple Mighty Mouse, which has a mouse ball in place of the wheel which allows both scroll_x and scroll_y movement.

We can create a window with the help of command given below

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

Below is the syntax of the on mouse scroll event, this method get called when this event is triggered

@window.event       
def on_mouse_scroll(x, y, scroll_x, scroll_y):
    print("Mouse scrolled")

Below is the implementation




# 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 centre
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')
  
new_label = pyglet.text.Label(text,
                          font_name ='Times New Roman',
                          font_size = 10,
                          x = 25, y = 25)
  
# 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 "C" get press
    if symbol == pyglet.window.key.C:
          
        print("Key C is pressed")
  
  
# on mouse scroll event
@window.event
def on_mouse_scroll(x, y, scroll_x, scroll_y):
      
    # prinitng some message
    print("Mouse scrolled")
      
  
   
  
# image for icon
img = image = pyglet.resource.image("logo.png")
  
# setting image as icon
window.set_icon(img)
  
                 
# start running the application
pyglet.app.run()

Output :

Mouse scrolled
Mouse scrolled
Mouse scrolled
Mouse scrolled
Mouse scrolled
Mouse scrolled
Mouse scrolled
Mouse scrolled
Mouse scrolled

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