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409 lines
12 KiB
Python
409 lines
12 KiB
Python
# Text formatting abstractions
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# Oft-used type object
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Int = type(0)
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# Represent a paragraph. This is a list of words with associated
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# font and size information, plus indents and justification for the
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# entire paragraph.
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# Once the words have been added to a paragraph, it can be laid out
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# for different line widths. Once laid out, it can be rendered at
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# different screen locations. Once rendered, it can be queried
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# for mouse hits, and parts of the text can be highlighted
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class Para:
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#
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def __init__(self):
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self.words = [] # The words
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self.just = 'l' # Justification: 'l', 'r', 'lr' or 'c'
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self.indent_left = self.indent_right = self.indent_hang = 0
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# Final lay-out parameters, may change
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self.left = self.top = self.right = self.bottom = \
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self.width = self.height = self.lines = None
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#
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# Add a word, computing size information for it.
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# Words may also be added manually by appending to self.words
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# Each word should be a 7-tuple:
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# (font, text, width, space, stretch, ascent, descent)
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def addword(self, d, font, text, space, stretch):
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if font <> None:
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d.setfont(font)
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width = d.textwidth(text)
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ascent = d.baseline()
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descent = d.lineheight() - ascent
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spw = d.textwidth(' ')
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space = space * spw
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stretch = stretch * spw
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tuple = (font, text, width, space, stretch, ascent, descent)
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self.words.append(tuple)
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#
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# Hooks to begin and end anchors -- insert numbers in the word list!
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def bgn_anchor(self, id):
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self.words.append(id)
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#
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def end_anchor(self, id):
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self.words.append(0)
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#
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# Return the total length (width) of the text added so far, in pixels
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def getlength(self):
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total = 0
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for word in self.words:
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if type(word) <> Int:
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total = total + word[2] + word[3]
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return total
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#
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# Tab to a given position (relative to the current left indent):
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# remove all stretch, add fixed space up to the new indent.
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# If the current position is already beying the tab stop,
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# don't add any new space (but still remove the stretch)
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def tabto(self, tab):
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total = 0
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as, de = 1, 0
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for i in range(len(self.words)):
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word = self.words[i]
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if type(word) == Int: continue
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fo, te, wi, sp, st, as, de = word
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self.words[i] = fo, te, wi, sp, 0, as, de
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total = total + wi + sp
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if total < tab:
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self.words.append(None, '', 0, tab-total, 0, as, de)
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#
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# Make a hanging tag: tab to hang, increment indent_left by hang,
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# and reset indent_hang to -hang
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def makehangingtag(self, hang):
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self.tabto(hang)
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self.indent_left = self.indent_left + hang
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self.indent_hang = -hang
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#
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# Decide where the line breaks will be given some screen width
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def layout(self, linewidth):
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self.width = linewidth
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height = 0
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self.lines = lines = []
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avail1 = self.width - self.indent_left - self.indent_right
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avail = avail1 - self.indent_hang
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words = self.words
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i = 0
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n = len(words)
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lastfont = None
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while i < n:
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firstfont = lastfont
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charcount = 0
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width = 0
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stretch = 0
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ascent = 0
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descent = 0
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lsp = 0
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j = i
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while i < n:
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word = words[i]
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if type(word) == Int:
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if word > 0 and width >= avail:
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break
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i = i+1
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continue
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fo, te, wi, sp, st, as, de = word
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if width + wi > avail and width > 0 and wi > 0:
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break
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if fo <> None:
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lastfont = fo
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if width == 0:
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firstfont = fo
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charcount = charcount + len(te) + (sp > 0)
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width = width + wi + sp
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lsp = sp
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stretch = stretch + st
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lst = st
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ascent = max(ascent, as)
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descent = max(descent, de)
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i = i+1
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while i > j and type(words[i-1]) == Int and \
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words[i-1] > 0: i = i-1
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width = width - lsp
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if i < n:
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stretch = stretch - lst
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else:
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stretch = 0
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tuple = i-j, firstfont, charcount, width, stretch, \
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ascent, descent
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lines.append(tuple)
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height = height + ascent + descent
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avail = avail1
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self.height = height
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#
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# Call a function for all words in a line
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def visit(self, wordfunc, anchorfunc):
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avail1 = self.width - self.indent_left - self.indent_right
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avail = avail1 - self.indent_hang
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v = self.top
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i = 0
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for tuple in self.lines:
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wordcount, firstfont, charcount, width, stretch, \
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ascent, descent = tuple
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h = self.left + self.indent_left
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if i == 0: h = h + self.indent_hang
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extra = 0
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if self.just == 'r': h = h + avail - width
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elif self.just == 'c': h = h + (avail - width) / 2
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elif self.just == 'lr' and stretch > 0:
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extra = avail - width
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v2 = v + ascent + descent
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for j in range(i, i+wordcount):
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word = self.words[j]
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if type(word) == Int:
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ok = anchorfunc(self, tuple, word, \
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h, v)
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if ok <> None: return ok
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continue
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fo, te, wi, sp, st, as, de = word
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if extra > 0 and stretch > 0:
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ex = extra * st / stretch
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extra = extra - ex
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stretch = stretch - st
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else:
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ex = 0
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h2 = h + wi + sp + ex
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ok = wordfunc(self, tuple, word, h, v, \
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h2, v2, (j==i), (j==i+wordcount-1))
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if ok <> None: return ok
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h = h2
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v = v2
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i = i + wordcount
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avail = avail1
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#
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# Render a paragraph in "drawing object" d, using the rectangle
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# given by (left, top, right) with an unspecified bottom.
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# Return the computed bottom of the text.
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def render(self, d, left, top, right):
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if self.width <> right-left:
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self.layout(right-left)
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self.left = left
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self.top = top
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self.right = right
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self.bottom = self.top + self.height
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self.anchorid = 0
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try:
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self.d = d
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self.visit(self.__class__._renderword, \
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self.__class__._renderanchor)
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finally:
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self.d = None
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return self.bottom
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#
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def _renderword(self, tuple, word, h, v, h2, v2, isfirst, islast):
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if word[0] <> None: self.d.setfont(word[0])
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baseline = v + tuple[5]
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self.d.text((h, baseline - word[5]), word[1])
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if self.anchorid > 0:
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self.d.line((h, baseline+2), (h2, baseline+2))
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#
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def _renderanchor(self, tuple, word, h, v):
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self.anchorid = word
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#
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# Return which anchor(s) was hit by the mouse
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def hitcheck(self, mouseh, mousev):
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self.mouseh = mouseh
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self.mousev = mousev
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self.anchorid = 0
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self.hits = []
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self.visit(self.__class__._hitcheckword, \
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self.__class__._hitcheckanchor)
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return self.hits
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#
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def _hitcheckword(self, tuple, word, h, v, h2, v2, isfirst, islast):
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if self.anchorid > 0 and h <= self.mouseh <= h2 and \
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v <= self.mousev <= v2:
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self.hits.append(self.anchorid)
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#
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def _hitcheckanchor(self, tuple, word, h, v):
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self.anchorid = word
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#
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# Return whether the given anchor id is present
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def hasanchor(self, id):
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return id in self.words or -id in self.words
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#
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# Extract the raw text from the word list, substituting one space
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# for non-empty inter-word space, and terminating with '\n'
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def extract(self):
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text = ''
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for w in self.words:
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if type(w) <> Int:
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word = w[1]
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if w[3]: word = word + ' '
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text = text + word
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return text + '\n'
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#
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# Return which character position was hit by the mouse, as
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# an offset in the entire text as returned by extract().
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# Return None if the mouse was not in this paragraph
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def whereis(self, d, mouseh, mousev):
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if mousev < self.top or mousev > self.bottom:
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return None
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self.mouseh = mouseh
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self.mousev = mousev
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self.lastfont = None
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self.charcount = 0
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try:
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self.d = d
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return self.visit(self.__class__._whereisword, \
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self.__class__._whereisanchor)
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finally:
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self.d = None
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#
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def _whereisword(self, tuple, word, h1, v1, h2, v2, isfirst, islast):
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fo, te, wi, sp, st, as, de = word
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if fo <> None: self.lastfont = fo
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h = h1
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if isfirst: h1 = 0
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if islast: h2 = 999999
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if not (v1 <= self.mousev <= v2 and h1 <= self.mouseh <= h2):
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self.charcount = self.charcount + len(te) + (sp > 0)
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return
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if self.lastfont <> None:
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self.d.setfont(self.lastfont)
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cc = 0
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for c in te:
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cw = self.d.textwidth(c)
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if self.mouseh <= h + cw/2:
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return self.charcount + cc
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cc = cc+1
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h = h+cw
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self.charcount = self.charcount + cc
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if self.mouseh <= (h+h2) / 2:
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return self.charcount
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else:
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return self.charcount + 1
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#
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def _whereisanchor(self, tuple, word, h, v):
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pass
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#
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# Return screen position corresponding to position in paragraph.
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# Return tuple (h, vtop, vbaseline, vbottom).
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# This is more or less the inverse of whereis()
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def screenpos(self, d, pos):
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if pos < 0:
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ascent, descent = self.lines[0][5:7]
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return self.left, self.top, self.top + ascent, \
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self.top + ascent + descent
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self.pos = pos
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self.lastfont = None
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try:
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self.d = d
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ok = self.visit(self.__class__._screenposword, \
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self.__class__._screenposanchor)
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finally:
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self.d = None
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if ok == None:
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ascent, descent = self.lines[-1][5:7]
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ok = self.right, self.bottom - ascent - descent, \
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self.bottom - descent, self.bottom
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return ok
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#
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def _screenposword(self, tuple, word, h1, v1, h2, v2, isfirst, islast):
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fo, te, wi, sp, st, as, de = word
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if fo <> None: self.lastfont = fo
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cc = len(te) + (sp > 0)
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if self.pos > cc:
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self.pos = self.pos - cc
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return
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if self.pos < cc:
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self.d.setfont(self.lastfont)
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h = h1 + self.d.textwidth(te[:self.pos])
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else:
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h = h2
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ascent, descent = tuple[5:7]
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return h, v1, v1+ascent, v2
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#
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def _screenposanchor(self, tuple, word, h, v):
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pass
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#
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# Invert the stretch of text between pos1 and pos2.
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# If pos1 is None, the beginning is implied;
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# if pos2 is None, the end is implied.
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# Undoes its own effect when called again with the same arguments
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def invert(self, d, pos1, pos2):
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if pos1 == None:
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pos1 = self.left, self.top, self.top, self.top
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else:
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pos1 = self.screenpos(d, pos1)
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if pos2 == None:
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pos2 = self.right, self.bottom,self.bottom,self.bottom
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else:
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pos2 = self.screenpos(d, pos2)
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h1, top1, baseline1, bottom1 = pos1
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h2, top2, baseline2, bottom2 = pos2
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if bottom1 <= top2:
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d.invert((h1, top1), (self.right, bottom1))
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h1 = self.left
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if bottom1 < top2:
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d.invert((h1, bottom1), (self.right, top2))
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top1, bottom1 = top2, bottom2
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d.invert((h1, top1), (h2, bottom2))
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# Test class Para
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# XXX This was last used on the Mac, hence the weird fonts...
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def test():
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import stdwin
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from stdwinevents import *
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words = 'The', 'quick', 'brown', 'fox', 'jumps', 'over', \
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'the', 'lazy', 'dog.'
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paralist = []
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for just in 'l', 'r', 'lr', 'c':
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p = Para()
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p.just = just
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p.addword(stdwin, ('New York', 'p', 12), words[0], 1, 1)
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for word in words[1:-1]:
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p.addword(stdwin, None, word, 1, 1)
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p.addword(stdwin, None, words[-1], 2, 4)
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p.addword(stdwin, ('New York', 'b', 18), 'Bye!', 0, 0)
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p.addword(stdwin, ('New York', 'p', 10), 'Bye!', 0, 0)
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paralist.append(p)
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window = stdwin.open('Para.test()')
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start = stop = selpara = None
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while 1:
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etype, win, detail = stdwin.getevent()
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if etype == WE_CLOSE:
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break
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if etype == WE_SIZE:
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window.change((0, 0), (1000, 1000))
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if etype == WE_DRAW:
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width, height = window.getwinsize()
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d = None
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try:
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d = window.begindrawing()
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d.cliprect(detail)
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d.erase(detail)
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v = 0
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for p in paralist:
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v = p.render(d, 0, v, width)
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if p == selpara and \
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start <> None and stop <> None:
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p.invert(d, start, stop)
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finally:
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if d: d.close()
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if etype == WE_MOUSE_DOWN:
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if selpara and start <> None and stop <> None:
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d = window.begindrawing()
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selpara.invert(d, start, stop)
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d.close()
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start = stop = selpara = None
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mouseh, mousev = detail[0]
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for p in paralist:
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start = p.whereis(stdwin, mouseh, mousev)
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if start <> None:
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selpara = p
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break
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if etype == WE_MOUSE_UP and start <> None and selpara:
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mouseh, mousev = detail[0]
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stop = selpara.whereis(stdwin, mouseh, mousev)
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if stop == None: start = selpara = None
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else:
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if start > stop:
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start, stop = stop, start
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d = window.begindrawing()
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selpara.invert(d, start, stop)
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d.close()
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window.close()
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