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new 'word by word' algorithm

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This commit is contained in:
Andreas Preikschat 2011-05-23 19:28:52 +02:00
parent 0f51c47d9e
commit ffd017799f
1 changed files with 54 additions and 14 deletions
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68
openlp/core/lib/renderer.py
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@ -231,7 +231,11 @@ class Renderer(object):
pages.extend(new_pages)
# Bibles
elif item.is_capable(ItemCapabilities.AllowsWordSplit):
import time
import datetime
start = time.time()
pages = self._paginate_slide_words(text, line_break)
print unicode(datetime.timedelta(seconds=time.time() - start))
return pages
def _calculate_default(self, screen):
@ -367,7 +371,7 @@ class Renderer(object):
"""
log.debug(u'_paginate_slide_words - Start')
line_end = u''
line_end = u' '
if line_break:
line_end = u'<br>'
formatted = []
@ -375,6 +379,7 @@ class Renderer(object):
previous_raw = u''
lines = text.split(u'\n')
for line in lines:
line = line.strip()
styled_line = expand_tags(line)
html = self.page_shell + previous_html + styled_line + HTML_END
self.web.setHtml(html)
@ -402,24 +407,59 @@ class Renderer(object):
previous_html = styled_line + line_end
previous_raw = line + line_end
continue
words = self._words_split(line)
for word in words:
styled_word = expand_tags(word)
html = self.page_shell + previous_html + styled_word + \
HTML_END
# Figure out how many words of the line will fit on screen.
# Instead of just looping of the list of words we follow a
# certain tactic, namely we try if the half of line fits. If it
# does we try if the half of the other half and the first half
# (75%) will still fit. In the case that the first half does not
# fit, we try if 25% will fit.
raw_words = self._words_split(line)
html_words = [expand_tags(word) for word in raw_words]
smallest_index = 0
highest_index = len(html_words) - 1
index = int(highest_index / 2)
while True:
html = self.page_shell + previous_html + \
u''.join(html_words[:index + 1]).strip() + HTML_END
self.web.setHtml(html)
# Text too long so go to next page
if self.web_frame.contentsSize().height() > \
self.page_height:
while previous_raw.endswith(u'<br>'):
previous_raw = previous_raw[:-4]
formatted.append(previous_raw)
# We know that it does not fit, so change/calculate the
# new index and highest_index accordingly.
highest_index = index
index = int(index - (index - smallest_index) / 2)
else:
smallest_index = index
index = int(index + (highest_index - index) / 2)
# We found the number of words which will fit
if smallest_index == index or highest_index == index:
formatted.append(previous_raw.rstrip(u'<br>') +
u''.join(raw_words[:index + 1]))
previous_html = u''
previous_raw = u''
previous_html += styled_word
previous_raw += word
previous_html += line_end
previous_raw += line_end
else:
continue
# Check if the rest of the line fits on the slide. If it
# does we do not have to do the much more intensive "word by
# word" checking.
html = self.page_shell + \
u''.join(html_words[index + 1:]).strip() + HTML_END
self.web.setHtml(html)
if self.web_frame.contentsSize().height() <= \
self.page_height:
previous_html = \
u''.join(html_words[index + 1:]).strip() + line_end
previous_raw = \
u''.join(raw_words[index + 1:]).strip() + line_end
break
else:
# The other words do not fit, thus reset the indexes,
# create a new list and continue with "word by word".
raw_words = raw_words[index + 1:]
html_words = html_words[index + 1:]
smallest_index = 0
highest_index = len(html_words) - 1
index = int(highest_index / 2)
else:
previous_html += styled_line + line_end
previous_raw += line + line_end