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119 lines
4.6 KiB
Python
119 lines
4.6 KiB
Python
# coding: utf8
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# WeasyPrint converts web documents (HTML, CSS, ...) to PDF.
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# Copyright (C) 2011 Simon Sapin
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Various classes to break text lines and draw them.
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"""
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from __future__ import division, unicode_literals
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from cgi import escape
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from gi.repository import Pango, PangoCairo # pylint: disable=E0611
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PANGO_VARIANT = {
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'normal': Pango.Variant.NORMAL,
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'small-caps': Pango.Variant.SMALL_CAPS,
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}
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PANGO_STYLE = {
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'normal': Pango.Style.NORMAL,
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'italic': Pango.Style.ITALIC,
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'oblique': Pango.Style.OBLIQUE,
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}
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class TextFragment(object):
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"""Text renderer using Pango.
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This class is used to render the text from a TextBox.
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"""
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def __init__(self, text, style, context, width=None):
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self.layout = PangoCairo.create_layout(context)
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font = Pango.FontDescription()
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font.set_family(', '.join(style.font_family))
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font.set_variant(PANGO_VARIANT[style.font_variant])
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font.set_style(PANGO_STYLE[style.font_style])
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font.set_absolute_size(Pango.units_from_double(style.font_size))
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font.set_weight(style.font_weight)
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self.layout.set_font_description(font)
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self.layout.set_text(text, -1)
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self.layout.set_wrap(Pango.WrapMode.WORD)
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word_spacing = style.word_spacing
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letter_spacing = style.letter_spacing
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if letter_spacing == 'normal':
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letter_spacing = 0
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if text and (word_spacing != 0 or letter_spacing != 0):
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word_spacing = Pango.units_from_double(word_spacing)
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letter_spacing = Pango.units_from_double(letter_spacing)
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markup = escape(text).replace(
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' ', '<span letter_spacing="%i"> </span>' % (
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word_spacing + letter_spacing,))
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markup = '<span letter_spacing="%i">%s</span>' % (
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letter_spacing , markup)
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attributes_list = Pango.parse_markup(markup, -1, '\x00')[1]
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self.layout.set_attributes(attributes_list)
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if width is not None:
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self.layout.set_width(Pango.units_from_double(width))
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# TODO: use get_line instead of get_lines when it is not broken anymore
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def split_first_line(self):
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"""Fit as much as possible in the available width for one line of text.
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Return ``(show_line, length, width, height, resume_at)``.
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``show_line``: a closure that takes a cairo Context and draws the
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first line.
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``length``: length in UTF-8 bytes of the first line
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``width``: width in pixels of the first line
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``height``: height in pixels of the first line
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``baseline``: baseline in pixels of the first line
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``resume_at``: The number of UTF-8 bytes to skip for the next line.
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May be ``None`` if the whole text fits in one line.
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This may be greater than ``length`` in case of preserved
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newline characters.
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"""
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lines = self.layout.get_lines_readonly()
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first_line = lines[0]
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length = first_line.length
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_ink_extents, logical_extents = first_line.get_extents()
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width = Pango.units_to_double(logical_extents.width)
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height = Pango.units_to_double(logical_extents.height)
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baseline = Pango.units_to_double(self.layout.get_baseline())
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if len(lines) >= 2:
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resume_at = lines[1].start_index
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else:
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resume_at = None
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def show_line(context):
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"""Draw the given ``line`` to the Cairo ``context``."""
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PangoCairo.update_layout(context, self.layout)
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PangoCairo.show_layout_line(context, first_line)
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return show_line, length, width, height, baseline, resume_at
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def line_widths(self):
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"""Return the width for each line."""
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lines = self.layout.get_lines_readonly()
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for line in lines:
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_ink_extents, logical_extents = line.get_extents()
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yield Pango.units_to_double(logical_extents.width)
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