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