Write a function, which moves the window from dependent on a previous mouse position (start_x
, start_y
) and a mouse position (new_x
, new_y
)
def move_window(start_x, start_y, new_x, new_y):
global window_size_x, window_size_y
window_x, window_y = eval(environ['SDL_VIDEO_WINDOW_POS'])
dist_x, dist_y = new_x - start_x, new_y - start_y
environ['SDL_VIDEO_WINDOW_POS'] = str(window_x + dist_x) + ',' + str(window_y + dist_y)
# Windows HACK
window_size_x += 1 if window_size_x % 2 == 0 else -1
screen = pygame.display.set_mode((window_size_x, window_size_y), pygame.NOFRAME)
In this function is a very important line:
window_size_x += 1 if window_size_x % 2 == 0 else -1
this line changes the width of the window from alternately by +1 and -1. On Windows systems there seems to be a bug, which ignores the new position parameter, if the size of the window didn’t change.
This “hack” is a workaround, which slightly change the size of the window whenever the position is changed.
A different approach, with no flickering, may look as follows. Note, though, that this version is significantly slower:
def move_window(start_x, start_y, new_x, new_y):
global window_size_x, window_size_y
buffer_screen = pygame.Surface((window_size_x, window_size_y))
buffer_screen.blit(pygame.display.get_surface(), pygame.display.get_surface().get_rect())
window_x, window_y = eval(environ['SDL_VIDEO_WINDOW_POS'])
dist_x, dist_y = new_x - start_x, new_y - start_y
environ['SDL_VIDEO_WINDOW_POS'] = str(window_x + dist_x) + ',' + str(window_y + dist_y)
window_size_x += 1 if window_size_x % 2 == 0 else -1
screen = pygame.display.set_mode((window_size_x, window_size_y), pygame.NOFRAME)
screen.blit(buffer_screen, buffer_screen.get_rect())
pygame.display.flip()
Change the position on MOUSEMOTION
and MOUSEBUTTONUP
:
def main():
run = True
pressed = False
start_pos = (0,0)
while run :
# [...]
for event in pygame.event.get():
if event.type == MOUSEBUTTONDOWN:
pressed = True
start_pos = pygame.mouse.get_pos()
elif event.type == MOUSEMOTION:
if pressed:
new_pos = pygame.mouse.get_pos()
move_window(*start_pos, *new_pos)
pygame.event.clear(pygame.MOUSEBUTTONUP)
elif event.type == MOUSEBUTTONUP:
pressed = False
new_pos = pygame.mouse.get_pos()
move_window(*start_pos, *new_pos)
Full example program:
# coding : utf-8
import pygame
from pygame.locals import *
from os import environ
pygame.init()
clock = pygame.time.Clock()
window_size_x, window_size_y = 720, 360
infos = pygame.display.Info()
environ['SDL_VIDEO_WINDOW_POS'] = str(int(infos.current_w/2)) + ',' + str(int(infos.current_h/2))
screen = pygame.display.set_mode((window_size_x, window_size_x), pygame.NOFRAME)
def move_window(start_x, start_y, new_x, new_y):
global window_size_x, window_size_y
window_x, window_y = eval(environ['SDL_VIDEO_WINDOW_POS'])
dist_x, dist_y = new_x - start_x, new_y - start_y
environ['SDL_VIDEO_WINDOW_POS'] = str(window_x + dist_x) + ',' + str(window_y + dist_y)
window_size_x += 1 if window_size_x % 2 == 0 else -1
screen = pygame.display.set_mode((window_size_x, window_size_y), pygame.NOFRAME)
def main():
run = True
pressed = False
start_pos = (0,0)
while run :
screen.fill((255, 255, 255))
pygame.display.update()
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
run = False
if event.type == MOUSEBUTTONDOWN:
pressed = True
start_pos = pygame.mouse.get_pos()
elif event.type == MOUSEMOTION:
if pressed:
new_pos = pygame.mouse.get_pos()
move_window(*start_pos, *new_pos)
pygame.event.clear(pygame.MOUSEBUTTONUP)
elif event.type == MOUSEBUTTONUP:
pressed = False
new_pos = pygame.mouse.get_pos()
move_window(*start_pos, *new_pos)
if __name__ == '__main__':
main()
This solution no longer works under Windows systems and with Pygame 2.0. The position of a window can, however, be changed with the WINAPI function MoveWindow
:
import pygame
from ctypes import windll
pygame.init()
screen = pygame.display.set_mode((400, 400), pygame.NOFRAME)
clock = pygame.time.Clock()
def moveWin(new_x, new_y):
hwnd = pygame.display.get_wm_info()['window']
w, h = pygame.display.get_surface().get_size()
windll.user32.MoveWindow(hwnd, new_x, new_y, w, h, False)
window_pos = [100, 100]
moveWin(*window_pos)
run = True
while run :
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
run = False
elif event.type == pygame.MOUSEMOTION:
if pygame.mouse.get_pressed()[0]:
window_pos[0] += event.rel[0]
window_pos[1] += event.rel[1]
moveWin(*window_pos)
screen.fill((255, 255, 255))
pygame.display.update()
clock.tick(60)