pygame module to work with the mouse
get the state of the mouse buttons
get the mouse cursor position
get the amount of mouse movement
set the mouse cursor position
hide or show the mouse cursor
get the current visibility state of the mouse cursor
check if the display is receiving mouse input
set the mouse cursor to a new cursor
get the current mouse cursor
query whether relative mouse mode is enabled
set relative mouse mode

The mouse functions can be used to get the current state of the mouse device. These functions can also alter the system cursor for the mouse.

When the display mode is set, the event queue will start receiving mouse events. The mouse buttons generate pygame.MOUSEBUTTONDOWN and pygame.MOUSEBUTTONUP events when they are pressed and released. These events contain a button attribute representing which button was pressed. The mouse wheel will generate pygame.MOUSEBUTTONDOWN and pygame.MOUSEBUTTONUP events when rolled. The button will be set to 4 when the wheel is rolled up, and to button 5 when the wheel is rolled down. Whenever the mouse is moved it generates a pygame.MOUSEMOTION event. The mouse movement is broken into small and accurate motion events. As the mouse is moving many motion events will be placed on the queue. Mouse motion events that are not properly cleaned from the event queue are the primary reason the event queue fills up.

If the mouse cursor is hidden, and input is grabbed to the current display the mouse will enter a virtual input mode, where the relative movements of the mouse will never be stopped by the borders of the screen. See the functions pygame.mouse.set_visible() and pygame.event.set_grab() to get this configured.

Mouse Wheel Behavior in pygame 2

There is proper functionality for mouse wheel behaviour with pygame 2 supporting pygame.MOUSEWHEEL events. The new events support horizontal and vertical scroll movements, with signed integer values representing the amount scrolled (x and y), as well as flipped direction (the set positive and negative values for each axis is flipped). Read more about SDL2 input-related changes here

In pygame 2, the mouse wheel functionality can be used by listening for the pygame.MOUSEWHEEL type of an event (Bear in mind they still emit pygame.MOUSEBUTTONDOWN events like in pygame 1.x, as well). When this event is triggered, a developer can access the appropriate Event object with pygame.event.get(). The object can be used to access data about the mouse scroll, such as which (it will tell you what exact mouse device trigger the event).

Code example of mouse scroll (tested on 2.0.0.dev7)
# Taken from husano896's PR thread (slightly modified)
import pygame
from pygame.locals import *
screen = pygame.display.set_mode((640, 480))
clock = pygame.time.Clock()

def main():
   while True:
      for event in pygame.event.get():
            if event.type == QUIT:
            elif event.type == MOUSEWHEEL:
               print(event.x, event.y)
               # can access properties with
               # proper notation(ex: event.y)

# Execute game:
get the state of the mouse buttons
get_pressed(num_buttons=3) -> (button1, button2, button3)
get_pressed(num_buttons=5) -> (button1, button2, button3, button4, button5)

Returns a sequence of booleans representing the state of all the mouse buttons. A true value means the mouse is currently being pressed at the time of the call.

Note, to get all of the mouse events it is better to use either pygame.event.wait() or pygame.event.get() and check all of those events to see if they are MOUSEBUTTONDOWN, MOUSEBUTTONUP, or MOUSEMOTION.

Note, that on X11 some X servers use middle button emulation. When you click both buttons 1 and 3 at the same time a 2 button event can be emitted.

Note, remember to call pygame.event.get() before this function. Otherwise it will not work as expected.

To support five button mice, an optional parameter num_buttons has been added in pygame 2. When this is set to 5, button4 and button5 are added to the returned tuple. Only 3 and 5 are valid values for this parameter.

Changed in pygame 2.0.0: num_buttons argument added

get the mouse cursor position
get_pos() -> (x, y)

Returns the x and y position of the mouse cursor. The position is relative to the top-left corner of the display. The cursor position can be located outside of the display window, but is always constrained to the screen.

get the amount of mouse movement
get_rel() -> (x, y)

Returns the amount of movement in x and y since the previous call to this function. The relative movement of the mouse cursor is constrained to the edges of the screen, but see the virtual input mouse mode for a way around this. Virtual input mode is described at the top of the page.

set the mouse cursor position
set_pos([x, y], /) -> None

Set the current mouse position to arguments given. If the mouse cursor is visible it will jump to the new coordinates. Moving the mouse will generate a new pygame.MOUSEMOTION event.

hide or show the mouse cursor
set_visible(bool, /) -> bool

If the bool argument is true, the mouse cursor will be visible. This will return the previous visible state of the cursor.

get the current visibility state of the mouse cursor
get_visible() -> bool

Get the current visibility state of the mouse cursor. True if the mouse is visible, False otherwise.

New in pygame 2.0.0.

check if the display is receiving mouse input
get_focused() -> bool

Returns true when pygame is receiving mouse input events (or, in windowing terminology, is "active" or has the "focus").

This method is most useful when working in a window. By contrast, in full-screen mode, this method always returns true.

Note: under MS Windows, the window that has the mouse focus also has the keyboard focus. But under X-Windows, one window can receive mouse events and another receive keyboard events. pygame.mouse.get_focused() indicates whether the pygame window receives mouse events.

set the mouse cursor to a new cursor
set_cursor(pygame.cursors.Cursor) -> None
set_cursor(size, hotspot, xormasks, andmasks) -> None
set_cursor(hotspot, surface) -> None
set_cursor(constant) -> None

Set the mouse cursor to something new. This function accepts either an explicit Cursor object or arguments to create a Cursor object.

See pygame.cursors.Cursorpygame object representing a cursor for help creating cursors and for examples.

Changed in pygame 2.0.1.

get the current mouse cursor
get_cursor() -> pygame.cursors.Cursor

Get the information about the mouse system cursor. The return value contains the same data as the arguments passed into pygame.mouse.set_cursor()set the mouse cursor to a new cursor.


Code that unpacked a get_cursor() call into size, hotspot, xormasks, andmasks will still work, assuming the call returns an old school type cursor.

Changed in pygame 2.0.1.

query whether relative mouse mode is enabled
get_relative_mode() -> bool

Query whether relative mouse mode is enabled.

New in pygame-ce 2.4.0.

set relative mouse mode
set_relative_mode(enable, /) -> None

Sets the relative mouse mode state. While the mouse is in relative mode, the cursor is hidden, the mouse position is constrained to the window, and pygame will report continuous relative mouse motion even if the mouse is at the edge of the window.

This function will flush any pending mouse motion."

Calling pygame.mouse.set_visible()hide or show the mouse cursor with argument True will exit relative mouse mode.

New in pygame-ce 2.4.0.

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