naja/widgets/text.py

   1 import pygame
   2
   3 from naja.constants import FONT, FONT_SIZE, EIGHT_BIT_SCALE, PALETTE
   4 from naja.resources import resources
   5 from naja.resources.mutators import EIGHT_BIT, blender
   6 from naja.utils import convert_colour
   7 from naja.widgets.base import Widget
   8
   9
  10 MARKUP_MAP = {
  11     'NORTH': (1, 'glyphs/arrow_up.png'),
  12     'SOUTH': (1, 'glyphs/arrow_down.png'),
  13     'EAST': (1, 'glyphs/arrow_right.png'),
  14     'WEST': (1, 'glyphs/arrow_left.png'),
  15 }
  16
  17
  18 class TextWidget(Widget):
  19
  20     def __init__(self, pos, text, size=None, fontname=None, fontsize=None,
  21                  colour=None):
  22         super(TextWidget, self).__init__(pos, size)
  23
  24         self.text = text
  25         self.fontname = fontname or FONT
  26         self.fontsize = (fontsize or FONT_SIZE) // EIGHT_BIT_SCALE
  27         self.colour = convert_colour(colour or PALETTE.BLACK)
  28
  29     def render_line(self, text):
  30         text_surf = self.font.render(text, True, self.colour)
  31         text_rect = text_surf.get_rect()
  32         return pygame.transform.scale(
  33             text_surf, (text_rect.width * EIGHT_BIT_SCALE,
  34                         text_rect.height * EIGHT_BIT_SCALE))
  35
  36     def prepare(self):
  37         self.font = resources.get_font(self.fontname, self.fontsize)
  38         self.surface = self.render_line(self.text)
  39         self.size = self.surface.get_rect().size
  40
  41     def draw(self, surface):
  42         surface.blit(self.surface, self.pos)
  43
  44
  45 class TextBoxWidget(TextWidget):
  46     def __init__(self, *args, **kwargs):
  47         self.padding = kwargs.pop('padding', 5)
  48         self.border = kwargs.pop('border', 2)
  49         self.bg_colour = convert_colour(kwargs.pop('bg_colour',
  50                                                    PALETTE.LIGHT_VIOLET))
  51         self.border_colour = convert_colour(kwargs.pop('border_colour',
  52                                                        PALETTE.BLACK))
  53         self.box_width = kwargs.pop('box_width', 0)
  54
  55         super(TextBoxWidget, self).__init__(*args, **kwargs)
  56
  57     def lines(self, image_map):
  58         if self.box_width != 0:
  59             return self._wrapped_lines(image_map)
  60         else:
  61             return self.text.splitlines()
  62
  63     def _wrapped_lines(self, image_map):
  64         def words_fit(words):
  65             words_line = ' '.join(words)
  66             width = self.font.size(words_line)[0]
  67             if width < self.box_width:
  68                 return True
  69             elif len(words) == 1:
  70                 Exception("Word %r too long for box." % (words[0],))
  71             return False
  72
  73         line_count = 0
  74         for line in self.text.splitlines():
  75             current_words = []
  76             for word in line.split():
  77                 suffix = ''
  78                 if word[-1] in '.,':
  79                     suffix = word[-1]
  80                     word = word[:-1]
  81                 markup_data = MARKUP_MAP.get(word, None)
  82                 if markup_data is not None:
  83                     word = ' ' * markup_data[0]
  84                 word += suffix
  85                 current_words.append(word)
  86                 if words_fit(current_words):
  87                     if markup_data is not None:
  88                         size = self.font.size(
  89                             ' '.join(current_words[:-1]) + ' ')
  90                         pos = (size[0] * EIGHT_BIT_SCALE,
  91                                size[1] * line_count * EIGHT_BIT_SCALE)
  92                         pos = (pos[0] + self.padding, pos[1] + self.padding)
  93                         image_map[pos] = resources.get_image(
  94                             markup_data[1],
  95                             transforms=(EIGHT_BIT, blender(self.colour)))
  96                         continue
  97                 else:
  98                     line_count += 1
  99                     yield ' '.join(current_words[:-1])
 100                     current_words = current_words[-1:]
 101             if current_words and words_fit(current_words):
 102                 yield ' '.join(current_words)
 103
 104     def prepare(self):
 105         self.font = resources.get_font(self.fontname, self.fontsize)
 106         image_map = {}
 107         rendered_lines = []
 108         width, height = self.padding * 2, self.padding * 2
 109         for line in self.lines(image_map):
 110             line_surface = self.render_line(line)
 111             line_rect = line_surface.get_rect()
 112             rendered_lines.append(line_surface)
 113             width = max(width, line_rect.width + self.padding * 2)
 114             height += line_rect.height
 115
 116         self.surface = pygame.surface.Surface((width, height),
 117                                               pygame.locals.SRCALPHA)
 118         self.surface.fill(self.bg_colour)
 119         self.size = self.surface.get_rect().size
 120
 121         x, y = self.padding, self.padding
 122         for line_surface in rendered_lines:
 123             self.surface.blit(line_surface, (x, y))
 124             y += line_surface.get_rect().height
 125         for pos, img in image_map.items():
 126             self.surface.blit(img, pos)
 127
 128     def draw(self, surface):
 129         surface.blit(self.surface, self.rect)