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': ('glyphs/arrow_up.png', None),
  12     'SOUTH': ('glyphs/arrow_down.png', None),
  13     'EAST': ('glyphs/arrow_right.png', None),
  14     'WEST': ('glyphs/arrow_left.png', None),
  15     'HEALTH': ('glyphs/health.png', PALETTE.DARK_RED),
  16     'WINTOKEN': ('glyphs/win.png', PALETTE.DARK_OLIVE),
  17     'KEY': ('glyphs/key.png', None),
  18     'MSB': ('glyphs/msb.png', None),
  19     'RED': ('glyphs/key.png', PALETTE.ORANGE),
  20     'GREEN': ('glyphs/key.png', PALETTE.GREEN),
  21     'BLUE': ('glyphs/key.png', PALETTE.BLUE),
  22 }
  23
  24
  25 class Glyph(object):
  26     def __init__(self, markup_text, glyph_keys, suffix=''):
  27         self.markup_text = markup_text
  28         self.glyph_keys = glyph_keys
  29         self.text = ' ' * len(self.glyph_keys) + suffix
  30
  31
  32 class TextWidget(Widget):
  33
  34     def __init__(self, pos, text, size=None, fontname=None, fontsize=None,
  35                  colour=None):
  36         super(TextWidget, self).__init__(pos, size)
  37
  38         self.text = text
  39         self.fontname = fontname or FONT
  40         self.fontsize = (fontsize or FONT_SIZE) // EIGHT_BIT_SCALE
  41         self.colour = convert_colour(colour or PALETTE.BLACK)
  42
  43     def render_line(self, text):
  44         text_surf = self.font.render(text, True, self.colour)
  45         text_rect = text_surf.get_rect()
  46         return pygame.transform.scale(
  47             text_surf, (text_rect.width * EIGHT_BIT_SCALE,
  48                         text_rect.height * EIGHT_BIT_SCALE))
  49
  50     def prepare(self):
  51         self.font = resources.get_font(self.fontname, self.fontsize)
  52         self.surface = self.render_line(self.text)
  53         self.size = self.surface.get_rect().size
  54
  55     def draw(self, surface):
  56         surface.blit(self.surface, self.pos)
  57
  58
  59 class TextBoxWidget(TextWidget):
  60     def __init__(self, *args, **kwargs):
  61         self.padding = kwargs.pop('padding', 4)
  62         self.border = kwargs.pop('border', 2)
  63         self.bg_colour = convert_colour(kwargs.pop('bg_colour',
  64                                                    PALETTE.LIGHT_VIOLET))
  65         self.border_colour = convert_colour(kwargs.pop('border_colour',
  66                                                        PALETTE.BLACK))
  67         self.box_width = kwargs.pop('box_width', 0)
  68
  69         super(TextBoxWidget, self).__init__(*args, **kwargs)
  70
  71     def lines(self, image_map):
  72         if self.box_width != 0:
  73             return self._wrapped_lines(image_map)
  74         else:
  75             return self.text.splitlines()
  76
  77     def _prepare_glyph(self, image_map, glyph, current_words, lines):
  78         size = self.font.size(' '.join(current_words[:-1] + ['']))
  79         x = size[0] * EIGHT_BIT_SCALE + self.padding
  80         y = size[1] * lines * EIGHT_BIT_SCALE + self.padding
  81         for glyph_key in glyph.glyph_keys:
  82             image_name, colour = MARKUP_MAP[glyph_key]
  83             if colour is None:
  84                 colour = self.colour
  85             image = resources.get_image(
  86                 image_name, transforms=(EIGHT_BIT, blender(colour)))
  87             image_map[(x, y)] = image
  88             x += image.get_width()
  89
  90     def _check_markup(self, word):
  91         suffix = ''
  92         if word[-1] in '.,':
  93             suffix = word[-1]
  94             word = word[:-1]
  95
  96         if word[0] == '{' and word[-1] == '}':
  97             subwords = word[1:-1].split(',')
  98             if all(subword in MARKUP_MAP for subword in subwords):
  99                 return Glyph(word + suffix, subwords, suffix)
 100
 101         return None
 102
 103     def _wrapped_lines(self, image_map):
 104         def words_fit(words):
 105             words_line = ' '.join(words)
 106             width = self.font.size(words_line)[0]
 107             if width < self.box_width:
 108                 return True
 109             elif len(words) == 1:
 110                 Exception("Word %r too long for box." % (words[0],))
 111             return False
 112
 113         line_count = 0
 114         for line in self.text.splitlines():
 115             current_words = []
 116             remaining_words = line.split()
 117             while remaining_words:
 118                 word = remaining_words.pop(0)
 119                 glyph = self._check_markup(word)
 120                 if glyph is not None:
 121                     word = glyph.text
 122                 current_words.append(word)
 123                 if words_fit(current_words):
 124                     if glyph is not None:
 125                         self._prepare_glyph(
 126                             image_map, glyph, current_words, line_count)
 127                 else:
 128                     line_count += 1
 129                     yield ' '.join(current_words[:-1])
 130                     current_words = []
 131                     if glyph is not None:
 132                         word = glyph.markup_text
 133                     remaining_words.insert(0, word)
 134             if current_words and words_fit(current_words):
 135                 yield ' '.join(current_words)
 136
 137     def prepare(self):
 138         self.font = resources.get_font(self.fontname, self.fontsize)
 139         image_map = {}
 140         rendered_lines = []
 141         width, height = self.padding * 2, self.padding * 2
 142         for line in self.lines(image_map):
 143             line_surface = self.render_line(line)
 144             line_rect = line_surface.get_rect()
 145             rendered_lines.append(line_surface)
 146             width = max(width, line_rect.width + self.padding * 2)
 147             height += line_rect.height
 148
 149         self.surface = pygame.surface.Surface((width, height),
 150                                               pygame.locals.SRCALPHA)
 151         self.surface.fill(self.bg_colour)
 152         self.size = self.surface.get_rect().size
 153
 154         x, y = self.padding, self.padding
 155         for line_surface in rendered_lines:
 156             self.surface.blit(line_surface, (x, y))
 157             y += line_surface.get_rect().height
 158         for pos, img in image_map.items():
 159             self.surface.blit(img, pos)
 160
 161     def draw(self, surface):
 162         surface.blit(self.surface, self.rect)