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-# Note -- this module is obsolete, it's too slow anyway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