naja/widgets/text.py

   1 import pygame
   2
   3 from naja.constants import FONT, FONT_SIZE, EIGHT_BIT_SCALE
   4 from naja.widgets.base import Widget
   5 from naja.resources import resources
   6 from naja.utils import convert_colour
   7
   8
   9 class TextWidget(Widget):
  10
  11     def __init__(self, pos, text, size=None, fontname=None, fontsize=None,
  12                  colour=None):
  13         super(TextWidget, self).__init__(pos, size)
  14
  15         self.text = text
  16         self.fontname = fontname or FONT
  17         self.fontsize = (fontsize or FONT_SIZE) // EIGHT_BIT_SCALE
  18         self.colour = convert_colour(colour or (0, 0, 0))
  19
  20     def render_line(self, text):
  21         text_surf = self.font.render(text, True, self.colour)
  22         text_rect = text_surf.get_rect()
  23         return pygame.transform.scale(
  24             text_surf, (text_rect.width * EIGHT_BIT_SCALE,
  25                         text_rect.height * EIGHT_BIT_SCALE))
  26
  27     def prepare(self):
  28         self.font = resources.get_font(self.fontname, self.fontsize)
  29         self.surface = self.render_line(self.text)
  30         self.size = self.surface.get_rect().size
  31
  32     def draw(self, surface):
  33         surface.blit(self.surface, self.pos)
  34
  35
  36 class TextBoxWidget(TextWidget):
  37     def __init__(self, *args, **kwargs):
  38         self.padding = kwargs.pop('padding', 5)
  39         self.border = kwargs.pop('border', 2)
  40         self.bg_colour = convert_colour(kwargs.pop('bg_colour',
  41                                                    (255, 255, 255, 192)))
  42         self.border_colour = convert_colour(kwargs.pop('border_colour',
  43                                                        (0, 0, 0)))
  44         self.box_width = kwargs.pop('box_width', 0)
  45
  46         super(TextBoxWidget, self).__init__(*args, **kwargs)
  47
  48     def lines(self):
  49         if self.box_width != 0:
  50             return self._wrapped_lines()
  51         else:
  52             return self.text.splitlines()
  53
  54     def _wrapped_lines(self):
  55         def words_fit(words):
  56             words_line = ' '.join(words)
  57             width = self.font.size(words_line)[0]
  58             if width < self.box_width:
  59                 return True
  60             elif len(words) == 1:
  61                 Exception("Word %r too long for box." % (words[0],))
  62             return False
  63
  64         for line in self.text.splitlines():
  65             current_words = []
  66             for word in line.split():
  67                 current_words.append(word)
  68                 if words_fit(current_words):
  69                     continue
  70                 else:
  71                     yield ' '.join(current_words[:-1])
  72                     current_words = current_words[-1:]
  73             if current_words and words_fit(current_words):
  74                 yield ' '.join(current_words)
  75
  76     def prepare(self):
  77         self.font = resources.get_font(self.fontname, self.fontsize)
  78         rendered_lines = []
  79         width, height = self.padding, self.padding
  80         for line in self.lines():
  81             line_surface = self.render_line(line)
  82             line_rect = line_surface.get_rect()
  83             rendered_lines.append(line_surface)
  84             width = max(width, line_rect.width + self.padding)
  85             height += line_rect.height
  86
  87         self.surface = pygame.surface.Surface((width, height),
  88                                               pygame.locals.SRCALPHA)
  89         self.surface.fill(self.bg_colour)
  90         self.size = self.surface.get_rect().size
  91
  92         x, y = self.padding, self.padding
  93         for line_surface in rendered_lines:
  94             self.surface.blit(line_surface, (x, y))
  95             y += line_surface.get_rect().height
  96
  97     def draw(self, surface):
  98         surface.blit(self.surface, self.rect)