naja/widgets/text.py

   1 import pygame
   2 import pygame.locals as pgl
   3
   4 from naja.constants import FONT, FONT_SIZE, EIGHT_BIT_SCALE, PALETTE, KEYS
   5 from naja.resources import resources
   6 from naja.resources.mutators import EIGHT_BIT, blender
   7 from naja.utils import convert_colour
   8 from naja.widgets.base import Widget
   9
  10
  11 MARKUP_MAP = {
  12     'NORTH': ('glyphs/arrow_up.png', None),
  13     'SOUTH': ('glyphs/arrow_down.png', None),
  14     'EAST': ('glyphs/arrow_right.png', None),
  15     'WEST': ('glyphs/arrow_left.png', None),
  16     'HEALTH': ('glyphs/health.png', PALETTE.DARK_RED),
  17     'WINTOKEN': ('glyphs/win.png', PALETTE.DARK_OLIVE),
  18     'KEY': ('glyphs/key.png', None),
  19     'MSB': ('glyphs/msb.png', None),
  20     'RED': ('glyphs/key.png', PALETTE.ORANGE),
  21     'GREEN': ('glyphs/key.png', PALETTE.GREEN),
  22     'BLUE': ('glyphs/key.png', PALETTE.BLUE),
  23     'CLOCKWISE': ('glyphs/clockwise.png', None),
  24     'ANTICLOCKWISE': ('glyphs/anticlockwise.png', None),
  25
  26     'HEALTH_NOCOLOUR': ('glyphs/health.png', None),
  27     'WINTOKEN_NOCOLOUR': ('glyphs/win.png', None),
  28 }
  29
  30
  31 class Glyph(object):
  32     def __init__(self, markup_text, glyph_keys, suffix=''):
  33         self.markup_text = markup_text
  34         self.glyph_keys = glyph_keys
  35         self.text = ' ' * len(self.glyph_keys) + suffix
  36
  37
  38 class TextWidget(Widget):
  39
  40     VIEW_PORT_DY = 50
  41
  42     def __init__(self, pos, text, fontname=None, fontsize=None,
  43                  colour=None, unselectable_colour=None, view_port=None):
  44         super(TextWidget, self).__init__(pos)
  45
  46         self.text = text
  47         self.fontname = fontname or FONT
  48         self.fontsize = (fontsize or FONT_SIZE) // EIGHT_BIT_SCALE
  49         self.colour = convert_colour(colour or PALETTE.BLACK)
  50         if unselectable_colour is not None:
  51             unselectable_colour = convert_colour(unselectable_colour)
  52         self.unselectable_colour = unselectable_colour
  53         self.view_port = (
  54             pygame.Rect((0, 0), view_port) if view_port is not None else None)
  55
  56     def render_line(self, text):
  57         colour = self.colour
  58         if not self.is_selectable() and self.unselectable_colour is not None:
  59             colour = self.unselectable_colour
  60         text_surf = self.font.render(text, True, colour)
  61         text_rect = text_surf.get_rect()
  62         return pygame.transform.scale(
  63             text_surf, (text_rect.width * EIGHT_BIT_SCALE,
  64                         text_rect.height * EIGHT_BIT_SCALE))
  65
  66     def update_size(self):
  67         if self.view_port is not None:
  68             self.size = self.view_port.size
  69         else:
  70             self.size = self.surface.get_rect().size
  71
  72     def prepare(self):
  73         self.font = resources.get_font(self.fontname, self.fontsize)
  74         self.surface = self.render_line(self.text)
  75         self.update_size()
  76
  77     def handle_event(self, ev):
  78         if self.view_port is None:
  79             return super(TextWidget, self).handle_event(ev)
  80         if ev.type == pgl.KEYDOWN:
  81             if ev.key in KEYS.DOWN:
  82                 self.view_port.move_ip(0, self.VIEW_PORT_DY)
  83                 if self.view_port.bottom > self.surface.get_rect().bottom:
  84                     self.view_port.bottom = self.surface.get_rect().bottom
  85                 return True
  86             elif ev.key in KEYS.UP:
  87                 self.view_port.move_ip(0, -self.VIEW_PORT_DY)
  88                 if self.view_port.top < 0:
  89                     self.view_port.top = 0
  90                 return True
  91         return super(TextWidget, self).handle_event(ev)
  92
  93     def draw(self, surface):
  94         if self.view_port is None:
  95             rect = self.rect
  96             area = None
  97         else:
  98             rect = self.pos
  99             area = self.view_port
 100         surface.blit(self.surface, rect, area)
 101
 102
 103 class TextBoxWidget(TextWidget):
 104     def __init__(self, *args, **kwargs):
 105         self.padding = kwargs.pop('padding', 4)
 106         self.border = kwargs.pop('border', 2)
 107         self.bg_colour = convert_colour(kwargs.pop('bg_colour',
 108                                                    PALETTE.LIGHT_VIOLET))
 109         self.border_colour = convert_colour(kwargs.pop('border_colour',
 110                                                        PALETTE.BLACK))
 111         self.box_width = kwargs.pop('box_width', 0)
 112
 113         super(TextBoxWidget, self).__init__(*args, **kwargs)
 114
 115     def lines(self, image_map):
 116         if self.box_width != 0:
 117             return self._wrapped_lines(image_map)
 118         else:
 119             return self.text.splitlines()
 120
 121     def _prepare_glyph(self, image_map, glyph, current_words, lines):
 122         size = self.font.size(' '.join(current_words[:-1] + ['']))
 123         x = size[0] * EIGHT_BIT_SCALE + self.padding
 124         y = size[1] * lines * EIGHT_BIT_SCALE + self.padding
 125         for glyph_key in glyph.glyph_keys:
 126             image_name, colour = MARKUP_MAP[glyph_key]
 127             if colour is None:
 128                 colour = self.colour
 129             image = resources.get_image(
 130                 image_name, transforms=(EIGHT_BIT, blender(colour)))
 131             image_map[(x, y)] = image
 132             x += image.get_width()
 133
 134     def _check_markup(self, word):
 135         suffix = ''
 136         if word[-1] in '.,':
 137             suffix = word[-1]
 138             word = word[:-1]
 139
 140         if word[0] == '{' and word[-1] == '}':
 141             subwords = word[1:-1].split(',')
 142             if all(subword in MARKUP_MAP for subword in subwords):
 143                 return Glyph(word + suffix, subwords, suffix)
 144
 145         return None
 146
 147     def _wrapped_lines(self, image_map):
 148         def words_fit(words):
 149             words_line = ' '.join(words)
 150             width = self.font.size(words_line)[0]
 151             if width < self.box_width:
 152                 return True
 153             elif len(words) == 1:
 154                 Exception("Word %r too long for box." % (words[0],))
 155             return False
 156
 157         line_count = 0
 158         for line in self.text.splitlines():
 159             line = line.strip()
 160             if not line:
 161                 line_count += 1
 162                 yield line
 163                 continue
 164             current_words = []
 165             remaining_words = line.split()
 166             while remaining_words:
 167                 word = remaining_words.pop(0)
 168                 glyph = self._check_markup(word)
 169                 if glyph is not None:
 170                     word = glyph.text
 171                 current_words.append(word)
 172                 if words_fit(current_words):
 173                     if glyph is not None:
 174                         self._prepare_glyph(
 175                             image_map, glyph, current_words, line_count)
 176                 else:
 177                     line_count += 1
 178                     yield ' '.join(current_words[:-1])
 179                     current_words = []
 180                     if glyph is not None:
 181                         word = glyph.markup_text
 182                     remaining_words.insert(0, word)
 183             if current_words and words_fit(current_words):
 184                 line_count += 1
 185                 yield ' '.join(current_words)
 186
 187     def prepare(self):
 188         self.font = resources.get_font(self.fontname, self.fontsize)
 189         image_map = {}
 190         rendered_lines = []
 191         width, height = self.padding * 2, self.padding * 2
 192         for line in self.lines(image_map):
 193             line_surface = self.render_line(line)
 194             line_rect = line_surface.get_rect()
 195             rendered_lines.append(line_surface)
 196             width = max(width, line_rect.width + self.padding * 2)
 197             height += line_rect.height
 198
 199         self.surface = pygame.surface.Surface((width, height),
 200                                               pygame.locals.SRCALPHA)
 201         self.surface.fill(self.bg_colour)
 202         self.update_size()
 203
 204         x, y = self.padding, self.padding
 205         for line_surface in rendered_lines:
 206             self.surface.blit(line_surface, (x, y))
 207             y += line_surface.get_rect().height
 208         for pos, img in image_map.items():
 209             self.surface.blit(img, pos)