src/app/widgets/cursors.py

   1 # -*- coding: utf-8 -*-
   2 """
   3 Curseurs winwii
   4
   5 $Id$
   6 $URL$
   7 """
   8
   9 import pygame
  10 import os
  11 from threading import Thread
  12 import time
  13 from eventutils import EventHandlerMixin, event_handler
  14 from itertools import cycle
  15
  16 class WarpingCursor(pygame.sprite.DirtySprite, EventHandlerMixin):
  17     '''
  18     The class for animating the warping cursor
  19     '''
  20
  21     @staticmethod
  22     def _get_theme_images(name) :
  23         basePath = os.path.abspath(__file__).split(os.path.sep)[:-1]
  24         basePath.extend(['data', 'cursor'])
  25         basePath.append(name)
  26         basePath = os.path.sep.join(basePath)
  27         images = [f for f in os.listdir(basePath) if os.path.splitext(f)[1] == '.png']
  28         return basePath, images
  29
  30
  31     def __init__(self, theme='black-perforated', duration=100, blinkMode=True):
  32         pygame.sprite.DirtySprite.__init__(self)
  33         imagesPath, images = WarpingCursor._get_theme_images(theme)
  34         flashImage = images.pop(images.index('flash.png'))
  35         flashImagePath = os.path.sep.join([imagesPath, flashImage])
  36         self.flashImage = pygame.image.load(flashImagePath).convert_alpha()
  37         images.sort(lambda a, b : cmp(*[int(os.path.splitext(f)[0]) for f in [a, b]]))
  38
  39         self.images = []
  40         for img in images :
  41             imagePath = os.path.sep.join([imagesPath, img])
  42             img = pygame.image.load(imagePath).convert_alpha()
  43             self.images.append(img)
  44
  45         # assumes that all images have same dimensions
  46         self.width = self.images[0].get_width()
  47         self.height = self.images[0].get_height()
  48         self.duration = duration
  49
  50         self.image = self.images[0]
  51         # workarround cursor alignement problem
  52         pygame.event.set_blocked(pygame.MOUSEMOTION)
  53         pygame.mouse.set_pos(pygame.mouse.get_pos())
  54         pygame.event.set_allowed(pygame.MOUSEMOTION)
  55         # ---
  56         x, y = pygame.mouse.get_pos()
  57         left = x - self.width / 2
  58         top = y - self.height / 2
  59         self.rect = pygame.Rect((left, top), (self.width, self.height))
  60
  61         self.blinkMode = blinkMode
  62         self._startBlink()
  63
  64     def __del__(self) :
  65         if hasattr(self, 'timer') :
  66             try : self.timer.stop()
  67             except : pass
  68
  69     def _startBlink(self) :
  70         if self.blinkMode :
  71             self._blinking = True
  72             self.iterator = self.iterImages()
  73             self.timer = ForeverTimer(self.duration, self.loadNext)
  74             self.timer.start()
  75
  76     def _stopBlink(self) :
  77         if self.blinkMode :
  78             self.timer.stop()
  79
  80     def iterImages(self) :
  81         for img in cycle(self.images) :
  82             yield img
  83
  84     def loadNext(self) :
  85         if self._blinking :
  86             self.dirty = 1
  87             self.image = self.iterator.next()
  88
  89     @event_handler(pygame.MOUSEBUTTONDOWN)
  90     def flashOn(self, event) :
  91         self.dirty = 1
  92         self._blinking = False
  93         self.image = self.flashImage
  94
  95     @event_handler(pygame.MOUSEBUTTONUP)
  96     def flashOff(self, event) :
  97         self.dirty = 1
  98         if self.blinkMode :
  99             self._blinking = True
 100         else :
 101             self.image = self.images[0]
 102
 103     @event_handler(pygame.MOUSEMOTION)
 104     def move(self, event) :
 105         self.dirty = 1
 106         self.rect.move_ip(event.rel)
 107
 108     def setPosition(self, pos) :
 109         self.dirty = 1
 110         x, y = pos
 111         rx, ry = self.rect.centerx, self.rect.centery
 112         self.rect.move_ip(x-rx, y-ry)
 113
 114
 115 class ForeverTimer(Thread) :
 116     def __init__(self, duration, func, *args, **kw) :
 117         Thread.__init__(self)
 118         self.duration = duration / 1000.
 119         self.func = func
 120         self.args = args
 121         self.kw = kw
 122         self.running = True
 123
 124     def run(self) :
 125         while self.running :
 126             self.func(*self.args, **self.kw)
 127             time.sleep(self.duration)
 128
 129     def stop(self) :
 130         self.running = False