mirror of https://github.com/python/cpython.git
409 lines
12 KiB
Python
Executable File
409 lines
12 KiB
Python
Executable File
# Text formatting abstractions
|
|
|
|
|
|
# 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()
|