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`pygame.mouse`
  pygame module to work with the mouse

  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 https://wiki.libsdl.org/MigrationGuide#input

  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 *
      pygame.init()
      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:
                     pygame.quit()
                     return
                  elif event.type == MOUSEWHEEL:
                     print(event)
                     print(event.x, event.y)
                     print(event.flipped)
                     print(event.which)
                     # can access properties with
                     # proper notation(ex: event.y)
            clock.tick(60)

      # Execute game:
      main()

  pygame.mouse.get_pressed()
    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

  pygame.mouse.get_pos()
    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.

  pygame.mouse.get_rel()
    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.

  pygame.mouse.set_pos()
    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.

  pygame.mouse.set_visible()
    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.

  pygame.mouse.get_visible()
    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.

  pygame.mouse.get_focused()
    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.

  pygame.mouse.set_cursor()
    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.Cursor` pygame object representing a cursor for help creating cursors and for examples.

    Changed in pygame 2.0.1.

  pygame.mouse.get_cursor()
    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.

    Note

    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.

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