python - 用户单击时如何移动无框架pygame窗口？

Question

我想创建一个没有框架的 pygame 窗口，当用户点击它并移动鼠标时它会移动。我试过这个脚本，但是当我点击窗口时，打印的是“0”而不是“1”

我的脚本有问题。

# coding : utf-8
import pygame
from pygame.locals import *
from random import randint
from os import environ
from math import sqrt
pygame.init()

max_fps = 250

clock = pygame.time.Clock()
window_size_x, window_size_x = 720, 360

infos = pygame.display.Info()
environ['SDL_VIDEO_WINDOW_POS'] = str(int(infos.current_w / 2)) + ',' + str(int(infos.current_h / 2)) # center the window
screen = pygame.display.set_mode((window_size_x, window_size_x), pygame.NOFRAME)

def move_window(): # move the windows when custom bar is hold
        window_x, window_y = eval(environ['SDL_VIDEO_WINDOW_POS'])
        mouse_x, mouse_y = pygame.mouse.get_pos()
        dist_x , dist_y = mouse_x - window_x, mouse_y - window_y # calculate the distance between mouse and window origin

        for event in pygame.event.get():        
            if event.type != MOUSEBUTTONUP: # while bar is hold
                print('1')
                mouse_x, mouse_y = pygame.mouse.get_pos()
                environ['SDL_VIDEO_WINDOW_POS'] = str(mouse_x - dist_x) + ',' + str(mouse_x - dist_x)
                screen = pygame.display.set_mode((window_size_x, window_size_x), pygame.NOFRAME) # rebuild window

def main():
    run = True
    while run :
        screen.fill((255, 255, 255))

        pygame.display.update()
        clock.tick(60) # build frame with 60 frame per second limitation

        for event in pygame.event.get():
            if event.type == MOUSEBUTTONDOWN:
                print('0')
                move_window()

if __name__ == '__main__':
    main()

Answer 1

编写一个函数，根据先前的鼠标位置(start_x、start_y)和鼠标位置(new_x)移动窗口, 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)

在这个函数中有一行非常重要:

window_size_x += 1 if window_size_x % 2 == 0 else -1

此行将窗口的宽度交替改变 +1 和 -1。在 Windows 系统上似乎有一个错误，如果窗口的大小没有改变，它会忽略新的位置参数。
这个“hack”是一种解决方法，只要位置发生变化，它就会稍微改变窗口的大小。

另一种没有闪烁的方法可能如下所示。不过请注意，此版本速度明显较慢:

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()

更改 MOUSEMOTION 和 MOUSEBUTTONUP 的位置:

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)

完整示例程序:

# 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()

---

此解决方案不再适用于 Windows 系统和 Pygame 2.0。但是，可以使用 WINAPI 函数 MoveWindow 更改窗口的位置。 :

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)