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, R180, 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     'RETURN': ('glyphs/return.png', None),
  17     'HEALTH': ('glyphs/health.png', PALETTE.DARK_RED),
  18     'WINTOKEN': ('glyphs/win.png', PALETTE.DARK_OLIVE),
  19     'KEY': ('glyphs/key.png', None),
  20     'MSB': ('glyphs/msb.png', None),
  21     'RED': ('glyphs/key.png', PALETTE.ORANGE),
  22     'GREEN': ('glyphs/key.png', PALETTE.GREEN),
  23     'BLUE': ('glyphs/key.png', PALETTE.BLUE),
  24     'CLOCKWISE': ('glyphs/clockwise.png', None),
  25     'ANTICLOCKWISE': ('glyphs/anticlockwise.png', None),
  26     'SHIFT_LEFT': ('glyphs/shift_left.png', None),
  27     'SHIFT_RIGHT': ('glyphs/shift_right.png', None),
  28     'COUNTDOWN': ('glyphs/countdown_4.png', PALETTE.DARK_VIOLET),
  29
  30     'HEALTH_NOCOLOUR': ('glyphs/health.png', None),
  31     'WINTOKEN_NOCOLOUR': ('glyphs/win.png', None),
  32 }
  33
  34
  35 class Glyph(object):
  36     def __init__(self, markup_text, glyph_keys, suffix=''):
  37         self.markup_text = markup_text
  38         self.glyph_keys = glyph_keys
  39         self.text = ' ' * len(self.glyph_keys) + suffix
  40
  41
  42 class TextWidget(Widget):
  43
  44     VIEW_PORT_DY = 50
  45
  46     def __init__(self, pos, text, fontname=None, fontsize=None,
  47                  colour=None, unselectable_colour=None, view_port=None,
  48                  centre=False, border=0, border_colour=PALETTE.GREY,
  49                  padding=2):
  50         super(TextWidget, self).__init__(pos)
  51
  52         self.text = text
  53         self.fontname = fontname or FONT
  54         self.fontsize = (fontsize or FONT_SIZE) // EIGHT_BIT_SCALE
  55         self.colour = convert_colour(colour or PALETTE.BLACK)
  56         if unselectable_colour is not None:
  57             unselectable_colour = convert_colour(unselectable_colour)
  58         self.unselectable_colour = unselectable_colour
  59         self.view_port = (
  60             pygame.Rect((0, 0), view_port) if view_port is not None else None)
  61         self.centre = centre
  62         self.centre_pos = pos
  63         self.border = border
  64         self.border_colour = convert_colour(border_colour)
  65         self.padding = padding
  66
  67     def render_line(self, text):
  68         colour = self.colour
  69         if not self.is_selectable() and self.unselectable_colour is not None:
  70             colour = self.unselectable_colour
  71         text_surf = self.font.render(text, True, colour)
  72         text_rect = text_surf.get_rect()
  73         return pygame.transform.scale(
  74             text_surf, (text_rect.width * EIGHT_BIT_SCALE,
  75                         text_rect.height * EIGHT_BIT_SCALE))
  76
  77     def render_border(self, surface):
  78         if not self.border or not self.border_colour:
  79             return
  80         rect = surface.get_rect()
  81         rect = rect.inflate(- self.border / 2, - self.border / 2)
  82         pygame.draw.rect(surface, self.border_colour, rect, self.border)
  83
  84     def update_size(self):
  85         if self.view_port is not None:
  86             self.size = self.view_port.size
  87         else:
  88             self.size = self.surface.get_rect().size
  89         if self.centre:
  90             self.pos = (self.centre_pos[0] - self.size[0] // 2,
  91                         self.centre_pos[1])
  92
  93     def prepare(self):
  94         self.font = resources.get_font(self.fontname, self.fontsize)
  95         self.surface = self.render_line(self.text)
  96         self.render_border(self.surface)
  97         self.update_size()
  98
  99     def handle_event(self, ev):
 100         if self.view_port is None:
 101             return super(TextWidget, self).handle_event(ev)
 102         if ev.type == pgl.KEYDOWN:
 103             if ev.key in KEYS.DOWN:
 104                 self.view_port.move_ip(0, self.VIEW_PORT_DY)
 105                 if self.view_port.bottom > self.surface.get_rect().bottom:
 106                     self.view_port.bottom = self.surface.get_rect().bottom
 107                 return True
 108             elif ev.key in KEYS.UP:
 109                 self.view_port.move_ip(0, -self.VIEW_PORT_DY)
 110                 if self.view_port.top < 0:
 111                     self.view_port.top = 0
 112                 return True
 113         return super(TextWidget, self).handle_event(ev)
 114
 115     def draw(self, surface):
 116         if self.view_port is None:
 117             rect = self.rect
 118             area = None
 119         else:
 120             rect = self.pos
 121             area = self.view_port
 122         surface.blit(self.surface, rect, area)
 123         if self.view_port is not None:
 124             self.draw_arrows(surface)
 125
 126     def draw_arrows(self, surface):
 127         if self.view_port.top > 0:
 128             up = resources.get_image('bits', 'arrow_on.png',
 129                                      transforms=(EIGHT_BIT,))
 130             icon_size = up.get_rect().height
 131             pos = (self.pos[0] + self.view_port.width - icon_size, self.pos[1])
 132             surface.blit(up, pos)
 133         if self.view_port.bottom < self.surface.get_rect().bottom:
 134             down = resources.get_image('bits', 'arrow_on.png',
 135                                        transforms=(R180, EIGHT_BIT))
 136             icon_size = down.get_rect().height
 137             pos = (self.pos[0] + self.view_port.width - icon_size,
 138                    self.pos[1] + self.view_port.height - icon_size)
 139             surface.blit(down, pos)
 140
 141
 142 class TextBoxWidget(TextWidget):
 143     def __init__(self, *args, **kwargs):
 144         self.bg_colour = convert_colour(kwargs.pop('bg_colour',
 145                                                    PALETTE.LIGHT_VIOLET))
 146         self.box_width = kwargs.pop('box_width', 0)
 147         self.full_width = kwargs.pop('full_width', True)
 148         kwargs.setdefault('padding', 4)
 149
 150         super(TextBoxWidget, self).__init__(*args, **kwargs)
 151
 152     def lines(self):
 153         if self.box_width != 0:
 154             return self._wrapped_lines()
 155         else:
 156             return ((line, []) for line in self.text.splitlines())
 157
 158     def _prepare_glyph(self, glyph, current_words):
 159         glyphs = []
 160         size = self.font.size(' '.join(current_words[:-1] + ['']))
 161         x = size[0] * EIGHT_BIT_SCALE
 162         for glyph_key in glyph.glyph_keys:
 163             image_name, colour = MARKUP_MAP[glyph_key]
 164             if colour is None:
 165                 colour = self.colour
 166             image = resources.get_image(
 167                 image_name, transforms=(EIGHT_BIT, blender(colour)))
 168             glyphs.append(((x, 0), image))
 169             x += image.get_width()
 170         return glyphs
 171
 172     def _check_markup(self, word):
 173         suffix = ''
 174         if word[-1] in '.,:':
 175             suffix = word[-1]
 176             word = word[:-1]
 177
 178         if not word:
 179             return None
 180         if word[0] == '{' and word[-1] == '}':
 181             subwords = word[1:-1].split(',')
 182             if all(subword in MARKUP_MAP for subword in subwords):
 183                 return Glyph(word + suffix, subwords, suffix)
 184
 185         return None
 186
 187     def _wrapped_lines(self):
 188         def words_fit(words):
 189             words_line = ' '.join(words)
 190             width = self.font.size(words_line)[0] * EIGHT_BIT_SCALE
 191             if width < self.box_width:
 192                 return True
 193             elif len(words) == 1:
 194                 Exception("Word %r too long for box." % (words[0],))
 195             return False
 196
 197         line_count = 0
 198         for line in self.text.splitlines():
 199             line = line.strip()
 200             if not line:
 201                 line_count += 1
 202                 yield (line, [])
 203                 continue
 204             current_words, glyphs = [], []
 205             remaining_words = line.split()
 206             while remaining_words:
 207                 word = remaining_words.pop(0)
 208                 glyph = self._check_markup(word)
 209                 if glyph is not None:
 210                     word = glyph.text
 211                 current_words.append(word)
 212                 if words_fit(current_words):
 213                     if glyph is not None:
 214                         glyphs.extend(self._prepare_glyph(
 215                             glyph, current_words))
 216                 else:
 217                     line_count += 1
 218                     yield (' '.join(current_words[:-1]), glyphs)
 219                     current_words, glyphs = [], []
 220                     if glyph is not None:
 221                         word = glyph.markup_text
 222                     remaining_words.insert(0, word)
 223             if current_words and words_fit(current_words):
 224                 line_count += 1
 225                 yield (' '.join(current_words), glyphs)
 226
 227     def prepare(self):
 228         self.font = resources.get_font(self.fontname, self.fontsize)
 229         rendered_lines = []
 230         width, height = self.padding * 2, self.padding * 2
 231         for line, glyphs in self.lines():
 232             line_surface = self.render_line(line)
 233             line_rect = line_surface.get_rect()
 234             rendered_lines.append(line_surface)
 235             width = max(width, line_rect.width + self.padding * 2)
 236             height += line_rect.height
 237             for pos, img in glyphs:
 238                 line_surface.blit(img, pos)
 239
 240         if self.full_width:
 241             width = max(width, self.box_width)
 242
 243         self.surface = pygame.surface.Surface((width, height),
 244                                               pygame.locals.SRCALPHA)
 245         self.surface.fill(self.bg_colour)
 246         self.update_size()
 247
 248         x, y = self.padding, self.padding
 249         for line_surface in rendered_lines:
 250             if self.centre:
 251                 x = (width - line_surface.get_rect().width) / 2
 252                 x += self.padding
 253             self.surface.blit(line_surface, (x, y))
 254             y += line_surface.get_rect().height
 255
 256         self.render_border(self.surface)