mirror of
https://github.com/Kozea/WeasyPrint.git
synced 2024-10-05 08:27:22 +03:00
122 lines
4.2 KiB
Python
122 lines
4.2 KiB
Python
|
# coding: utf8
|
||
|
|
|
||
|
|
# WeasyPrint converts web documents (HTML, CSS, ...) to PDF.
|
||
|
|
# Copyright (C) 2011 Simon Sapin
|
||
|
|
#
|
||
|
|
# This program is free software: you can redistribute it and/or modify
|
||
|
|
# it under the terms of the GNU Affero General Public License as
|
||
|
|
# published by the Free Software Foundation, either version 3 of the
|
||
|
|
# License, or (at your option) any later version.
|
||
|
|
#
|
||
|
|
# This program is distributed in the hope that it will be useful,
|
||
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
# GNU Affero General Public License for more details.
|
||
|
|
#
|
||
|
|
# You should have received a copy of the GNU Affero General Public License
|
||
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
|
||
|
|
from ..formatting_structure import boxes
|
||
|
|
from .percentages import resolve_percentages
|
||
|
|
|
||
|
|
|
||
|
|
def block_dimensions(box):
|
||
|
|
resolve_percentages(box)
|
||
|
|
block_level_width(box)
|
||
|
|
block_level_height(box)
|
||
|
|
|
||
|
|
|
||
|
|
def block_level_width(box):
|
||
|
|
# cb = containing block
|
||
|
|
cb_width, cb_height = box.containing_block_size()
|
||
|
|
|
||
|
|
# http://www.w3.org/TR/CSS21/visudet.html#blockwidth
|
||
|
|
|
||
|
|
# These names are waaay too long
|
||
|
|
margin_l = box.margin_left
|
||
|
|
margin_r = box.margin_right
|
||
|
|
padding_l = box.padding_left
|
||
|
|
padding_r = box.padding_right
|
||
|
|
border_l = box.border_left_width
|
||
|
|
border_r = box.border_right_width
|
||
|
|
width = box.width
|
||
|
|
|
||
|
|
# Only margin-left, margin-right and width can be 'auto'.
|
||
|
|
# We want: width of containing block ==
|
||
|
|
# margin-left + border-left-width + padding-left + width
|
||
|
|
# + padding-right + border-right-width + margin-right
|
||
|
|
|
||
|
|
paddings_plus_borders = padding_l + padding_r + border_l + border_r
|
||
|
|
if box.width != 'auto':
|
||
|
|
total = paddings_plus_borders + width
|
||
|
|
if margin_l != 'auto':
|
||
|
|
total += margin_l
|
||
|
|
if margin_r != 'auto':
|
||
|
|
total += margin_r
|
||
|
|
if total > cb_width:
|
||
|
|
if margin_l == 'auto':
|
||
|
|
margin_l = box.margin_left = 0
|
||
|
|
if margin_r == 'auto':
|
||
|
|
margin_r = box.margin_right = 0
|
||
|
|
if width != 'auto' and margin_l != 'auto' and margin_r != 'auto':
|
||
|
|
# The equation is over-constrained
|
||
|
|
margin_sum = cb_width - paddings_plus_borders - width
|
||
|
|
# This is the direction of the containing block, but the containing
|
||
|
|
# block for block-level boxes in normal flow is always the parent.
|
||
|
|
# TODO: is it?
|
||
|
|
if box.parent.style.direction == 'ltr':
|
||
|
|
margin_r = box.margin_right = margin_sum - margin_l
|
||
|
|
else:
|
||
|
|
margin_l = box.margin_left = margin_sum - margin_r
|
||
|
|
if width == 'auto':
|
||
|
|
if margin_l == 'auto':
|
||
|
|
margin_l = box.margin_left = 0
|
||
|
|
if margin_r == 'auto':
|
||
|
|
margin_r = box.margin_right = 0
|
||
|
|
width = box.width = cb_width - (
|
||
|
|
paddings_plus_borders + margin_l + margin_r)
|
||
|
|
margin_sum = cb_width - paddings_plus_borders - width
|
||
|
|
if margin_l == 'auto' and margin_r == 'auto':
|
||
|
|
box.margin_left = margin_sum / 2.
|
||
|
|
box.margin_right = margin_sum / 2.
|
||
|
|
elif margin_l == 'auto' and margin_r != 'auto':
|
||
|
|
box.margin_left = margin_sum - margin_r
|
||
|
|
elif margin_l != 'auto' and margin_r == 'auto':
|
||
|
|
box.margin_right = margin_sum - margin_l
|
||
|
|
|
||
|
|
# Sanity check
|
||
|
|
assert box.margin_width() == cb_width
|
||
|
|
|
||
|
|
|
||
|
|
def block_level_height(box):
|
||
|
|
if box.style.overflow != 'visible':
|
||
|
|
raise NotImplementedError
|
||
|
|
|
||
|
|
if isinstance(box, boxes.ReplacedBox):
|
||
|
|
raise NotImplementedError
|
||
|
|
|
||
|
|
assert isinstance(box, boxes.BlockBox)
|
||
|
|
|
||
|
|
if box.margin_top == 'auto':
|
||
|
|
box.margin_top = 0
|
||
|
|
if box.margin_bottom == 'auto':
|
||
|
|
box.margin_bottom = 0
|
||
|
|
|
||
|
|
position_x = box.content_box_x()
|
||
|
|
position_y = box.content_box_y()
|
||
|
|
initial_position_y = position_y
|
||
|
|
for child in box.children:
|
||
|
|
# TODO: collapse margins:
|
||
|
|
# http://www.w3.org/TR/CSS21/visudet.html#normal-block
|
||
|
|
child.position_x = position_x
|
||
|
|
child.position_y = position_y
|
||
|
|
|
||
|
|
from . import compute_dimensions # Avoid circular import
|
||
|
|
compute_dimensions(child)
|
||
|
|
|
||
|
|
position_y += child.margin_height()
|
||
|
|
|
||
|
|
if box.height == 'auto':
|
||
|
|
box.height = position_y - initial_position_y
|