890 lines
36 KiB
Python
890 lines
36 KiB
Python
"""
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weasyprint.layout.tables
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------------------------
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Layout for tables and internal table boxes.
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:copyright: Copyright 2011-2019 Simon Sapin and contributors, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from ..formatting_structure import boxes
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from ..logger import LOGGER
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from .percentages import resolve_one_percentage, resolve_percentages
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from .preferred import max_content_width, table_and_columns_preferred_widths
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def table_layout(context, table, max_position_y, skip_stack, containing_block,
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page_is_empty, absolute_boxes, fixed_boxes):
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"""Layout for a table box."""
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# Avoid a circular import
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from .blocks import (
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block_container_layout, block_level_page_break,
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find_earlier_page_break)
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column_widths = table.column_widths
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if table.style['border_collapse'] == 'separate':
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border_spacing_x, border_spacing_y = table.style['border_spacing']
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else:
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border_spacing_x = 0
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border_spacing_y = 0
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# TODO: reverse this for direction: rtl
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column_positions = table.column_positions = []
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position_x = table.content_box_x()
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rows_x = position_x + border_spacing_x
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for width in column_widths:
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position_x += border_spacing_x
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column_positions.append(position_x)
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position_x += width
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rows_width = position_x - rows_x
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if table.style['border_collapse'] == 'collapse':
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if skip_stack:
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skipped_groups, group_skip_stack = skip_stack
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if group_skip_stack:
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skipped_rows, _ = group_skip_stack
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else:
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skipped_rows = 0
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for group in table.children[:skipped_groups]:
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skipped_rows += len(group.children)
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else:
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skipped_rows = 0
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_, horizontal_borders = table.collapsed_border_grid
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if horizontal_borders:
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table.border_top_width = max(
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width for _, (_, width, _)
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in horizontal_borders[skipped_rows]) / 2
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# Make this a sub-function so that many local variables like rows_x
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# don't need to be passed as parameters.
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def group_layout(group, position_y, max_position_y,
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page_is_empty, skip_stack):
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resume_at = None
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next_page = {'break': 'any', 'page': None}
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original_page_is_empty = page_is_empty
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resolve_percentages(group, containing_block=table)
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group.position_x = rows_x
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group.position_y = position_y
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group.width = rows_width
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new_group_children = []
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# For each rows, cells for which this is the last row (with rowspan)
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ending_cells_by_row = [[] for row in group.children]
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is_group_start = skip_stack is None
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if is_group_start:
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skip = 0
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else:
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skip, skip_stack = skip_stack
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assert not skip_stack # No breaks inside rows for now
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for i, row in enumerate(group.children[skip:]):
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index_row = i + skip
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row.index = index_row
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if new_group_children:
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page_break = block_level_page_break(
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new_group_children[-1], row)
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if page_break in ('page', 'recto', 'verso', 'left', 'right'):
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next_page['break'] = page_break
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resume_at = (index_row, None)
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break
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resolve_percentages(row, containing_block=table)
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row.position_x = rows_x
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row.position_y = position_y
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row.width = rows_width
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# Place cells at the top of the row and layout their content
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new_row_children = []
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for cell in row.children:
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spanned_widths = column_widths[cell.grid_x:][:cell.colspan]
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# In the fixed layout the grid width is set by cells in
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# the first row and column elements.
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# This may be less than the previous value of cell.colspan
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# if that would bring the cell beyond the grid width.
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cell.colspan = len(spanned_widths)
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if cell.colspan == 0:
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# The cell is entierly beyond the grid width, remove it
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# entierly. Subsequent cells in the same row have greater
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# grid_x, so they are beyond too.
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cell_index = row.children.index(cell)
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ignored_cells = row.children[cell_index:]
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LOGGER.warning('This table row has more columns than '
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'the table, ignored %i cells: %r',
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len(ignored_cells), ignored_cells)
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break
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resolve_percentages(cell, containing_block=table)
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cell.position_x = column_positions[cell.grid_x]
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cell.position_y = row.position_y
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cell.margin_top = 0
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cell.margin_left = 0
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cell.width = 0
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borders_plus_padding = cell.border_width() # with width==0
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# TODO: we should remove the number of columns with no
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# originating cells to cell.colspan, see
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# test_layout_table_auto_49
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cell.width = (
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sum(spanned_widths) +
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border_spacing_x * (cell.colspan - 1) -
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borders_plus_padding)
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# The computed height is a minimum
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cell.computed_height = cell.height
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cell.height = 'auto'
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cell, _, _, _, _ = block_container_layout(
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context, cell,
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max_position_y=float('inf'),
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skip_stack=None,
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page_is_empty=True,
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absolute_boxes=absolute_boxes,
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fixed_boxes=fixed_boxes)
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cell.empty = not any(
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child.is_floated() or child.is_in_normal_flow()
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for child in cell.children)
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cell.content_height = cell.height
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if cell.computed_height != 'auto':
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cell.height = max(cell.height, cell.computed_height)
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new_row_children.append(cell)
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row = row.copy_with_children(new_row_children)
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# Table height algorithm
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# http://www.w3.org/TR/CSS21/tables.html#height-layout
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# cells with vertical-align: baseline
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baseline_cells = []
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for cell in row.children:
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vertical_align = cell.style['vertical_align']
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if vertical_align in ('top', 'middle', 'bottom'):
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cell.vertical_align = vertical_align
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else:
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# Assume 'baseline' for any other value
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cell.vertical_align = 'baseline'
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cell.baseline = cell_baseline(cell)
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baseline_cells.append(cell)
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if baseline_cells:
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row.baseline = max(cell.baseline for cell in baseline_cells)
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for cell in baseline_cells:
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extra = row.baseline - cell.baseline
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if cell.baseline != row.baseline and extra:
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add_top_padding(cell, extra)
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# row height
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for cell in row.children:
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ending_cells_by_row[cell.rowspan - 1].append(cell)
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ending_cells = ending_cells_by_row.pop(0)
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if ending_cells: # in this row
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if row.height == 'auto':
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row_bottom_y = max(
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cell.position_y + cell.border_height()
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for cell in ending_cells)
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row.height = max(row_bottom_y - row.position_y, 0)
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else:
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row.height = max(row.height, max(
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row_cell.height for row_cell in ending_cells))
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row_bottom_y = row.position_y + row.height
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else:
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row_bottom_y = row.position_y
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row.height = 0
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if not baseline_cells:
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row.baseline = row_bottom_y
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# Add extra padding to make the cells the same height as the row
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# and honor vertical-align
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for cell in ending_cells:
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cell_bottom_y = cell.position_y + cell.border_height()
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extra = row_bottom_y - cell_bottom_y
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if extra:
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if cell.vertical_align == 'bottom':
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add_top_padding(cell, extra)
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elif cell.vertical_align == 'middle':
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extra /= 2.
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add_top_padding(cell, extra)
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cell.padding_bottom += extra
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else:
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cell.padding_bottom += extra
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if cell.computed_height != 'auto':
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vertical_align_shift = 0
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if cell.vertical_align == 'middle':
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vertical_align_shift = (
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cell.computed_height - cell.content_height) / 2
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elif cell.vertical_align == 'bottom':
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vertical_align_shift = (
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cell.computed_height - cell.content_height)
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if vertical_align_shift > 0:
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for child in cell.children:
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child.translate(dy=vertical_align_shift)
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next_position_y = row.position_y + row.height + border_spacing_y
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# Break if this row overflows the page, unless there is no
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# other content on the page.
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if next_position_y > max_position_y and not page_is_empty:
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if new_group_children:
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previous_row = new_group_children[-1]
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page_break = block_level_page_break(previous_row, row)
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if page_break == 'avoid':
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earlier_page_break = find_earlier_page_break(
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new_group_children, absolute_boxes, fixed_boxes)
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if earlier_page_break:
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new_group_children, resume_at = earlier_page_break
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break
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else:
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resume_at = (index_row, None)
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break
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if original_page_is_empty:
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resume_at = (index_row, None)
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else:
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return None, None, next_page
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break
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position_y = next_position_y
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new_group_children.append(row)
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page_is_empty = False
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# Do not keep the row group if we made a page break
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# before any of its rows or with 'avoid'
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if resume_at and not original_page_is_empty and (
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group.style['break_inside'] in ('avoid', 'avoid-page') or
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not new_group_children):
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return None, None, next_page
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group = group.copy_with_children(
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new_group_children,
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is_start=is_group_start, is_end=resume_at is None)
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# Set missing baselines in a second loop because of rowspan
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for row in group.children:
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if row.baseline is None:
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if row.children:
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# lowest bottom content edge
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row.baseline = max(
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cell.content_box_y() + cell.height
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for cell in row.children) - row.position_y
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else:
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row.baseline = 0
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group.height = position_y - group.position_y
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if group.children:
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# The last border spacing is outside of the group.
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group.height -= border_spacing_y
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return group, resume_at, next_page
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def body_groups_layout(skip_stack, position_y, max_position_y,
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page_is_empty):
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if skip_stack is None:
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skip = 0
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else:
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skip, skip_stack = skip_stack
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new_table_children = []
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resume_at = None
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next_page = {'break': 'any', 'page': None}
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for i, group in enumerate(table.children[skip:]):
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index_group = i + skip
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group.index = index_group
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|
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if group.is_header or group.is_footer:
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continue
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if new_table_children:
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page_break = block_level_page_break(
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new_table_children[-1], group)
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if page_break in ('page', 'recto', 'verso', 'left', 'right'):
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next_page['break'] = page_break
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resume_at = (index_group, None)
|
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break
|
||
|
||
new_group, resume_at, next_page = group_layout(
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group, position_y, max_position_y, page_is_empty, skip_stack)
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skip_stack = None
|
||
|
||
if new_group is None:
|
||
if new_table_children:
|
||
previous_group = new_table_children[-1]
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||
page_break = block_level_page_break(previous_group, group)
|
||
if page_break == 'avoid':
|
||
earlier_page_break = find_earlier_page_break(
|
||
new_table_children, absolute_boxes, fixed_boxes)
|
||
if earlier_page_break is not None:
|
||
new_table_children, resume_at = earlier_page_break
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||
break
|
||
resume_at = (index_group, None)
|
||
else:
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return None, None, next_page, position_y
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break
|
||
|
||
new_table_children.append(new_group)
|
||
position_y += new_group.height + border_spacing_y
|
||
page_is_empty = False
|
||
|
||
if resume_at:
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||
resume_at = (index_group, resume_at)
|
||
break
|
||
|
||
return new_table_children, resume_at, next_page, position_y
|
||
|
||
# Layout for row groups, rows and cells
|
||
position_y = table.content_box_y() + border_spacing_y
|
||
initial_position_y = position_y
|
||
table_rows = [
|
||
child for child in table.children
|
||
if not child.is_header and not child.is_footer]
|
||
|
||
def all_groups_layout():
|
||
# If the page is not empty, we try to render the header and the footer
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# on it. If the table does not fit on the page, we try to render it on
|
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# the next page.
|
||
|
||
# If the page is empty and the header and footer are too big, there
|
||
# are not rendered. If no row can be rendered because of the header and
|
||
# the footer, the header and/or the footer are not rendered.
|
||
|
||
if page_is_empty:
|
||
header_footer_max_position_y = max_position_y
|
||
else:
|
||
header_footer_max_position_y = float('inf')
|
||
|
||
if table.children and table.children[0].is_header:
|
||
header = table.children[0]
|
||
header, resume_at, next_page = group_layout(
|
||
header, position_y, header_footer_max_position_y,
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||
skip_stack=None, page_is_empty=False)
|
||
if header and not resume_at:
|
||
header_height = header.height + border_spacing_y
|
||
else: # Header too big for the page
|
||
header = None
|
||
else:
|
||
header = None
|
||
|
||
if table.children and table.children[-1].is_footer:
|
||
footer = table.children[-1]
|
||
footer, resume_at, next_page = group_layout(
|
||
footer, position_y, header_footer_max_position_y,
|
||
skip_stack=None, page_is_empty=False)
|
||
if footer and not resume_at:
|
||
footer_height = footer.height + border_spacing_y
|
||
else: # Footer too big for the page
|
||
footer = None
|
||
else:
|
||
footer = None
|
||
|
||
# Don't remove headers and footers if breaks are avoided in line groups
|
||
skip = skip_stack[0] if skip_stack else 0
|
||
avoid_breaks = False
|
||
for group in table.children[skip:]:
|
||
if not group.is_header and not group.is_footer:
|
||
avoid_breaks = (
|
||
group.style['break_inside'] in ('avoid', 'avoid-page'))
|
||
break
|
||
|
||
if header and footer:
|
||
# Try with both the header and footer
|
||
new_table_children, resume_at, next_page, end_position_y = (
|
||
body_groups_layout(
|
||
skip_stack,
|
||
position_y=position_y + header_height,
|
||
max_position_y=max_position_y - footer_height,
|
||
page_is_empty=avoid_breaks))
|
||
if new_table_children or not table_rows or not page_is_empty:
|
||
footer.translate(dy=end_position_y - footer.position_y)
|
||
end_position_y += footer_height
|
||
return (header, new_table_children, footer,
|
||
end_position_y, resume_at, next_page)
|
||
else:
|
||
# We could not fit any content, drop the footer
|
||
footer = None
|
||
|
||
if header and not footer:
|
||
# Try with just the header
|
||
new_table_children, resume_at, next_page, end_position_y = (
|
||
body_groups_layout(
|
||
skip_stack,
|
||
position_y=position_y + header_height,
|
||
max_position_y=max_position_y,
|
||
page_is_empty=avoid_breaks))
|
||
if new_table_children or not table_rows or not page_is_empty:
|
||
return (header, new_table_children, footer,
|
||
end_position_y, resume_at, next_page)
|
||
else:
|
||
# We could not fit any content, drop the header
|
||
header = None
|
||
|
||
if footer and not header:
|
||
# Try with just the footer
|
||
new_table_children, resume_at, next_page, end_position_y = (
|
||
body_groups_layout(
|
||
skip_stack,
|
||
position_y=position_y,
|
||
max_position_y=max_position_y - footer_height,
|
||
page_is_empty=avoid_breaks))
|
||
if new_table_children or not table_rows or not page_is_empty:
|
||
footer.translate(dy=end_position_y - footer.position_y)
|
||
end_position_y += footer_height
|
||
return (header, new_table_children, footer,
|
||
end_position_y, resume_at, next_page)
|
||
else:
|
||
# We could not fit any content, drop the footer
|
||
footer = None
|
||
|
||
assert not (header or footer)
|
||
new_table_children, resume_at, next_page, end_position_y = (
|
||
body_groups_layout(
|
||
skip_stack, position_y, max_position_y, page_is_empty))
|
||
return (
|
||
header, new_table_children, footer, end_position_y, resume_at,
|
||
next_page)
|
||
|
||
def get_column_cells(table, column):
|
||
"""Closure getting the column cells."""
|
||
return lambda: [
|
||
cell
|
||
for row_group in table.children
|
||
for row in row_group.children
|
||
for cell in row.children
|
||
if cell.grid_x == column.grid_x]
|
||
|
||
header, new_table_children, footer, position_y, resume_at, next_page = \
|
||
all_groups_layout()
|
||
|
||
if new_table_children is None:
|
||
assert resume_at is None
|
||
table = None
|
||
adjoining_margins = []
|
||
collapsing_through = False
|
||
return (
|
||
table, resume_at, next_page, adjoining_margins, collapsing_through)
|
||
|
||
table = table.copy_with_children(
|
||
([header] if header is not None else []) +
|
||
new_table_children +
|
||
([footer] if footer is not None else []),
|
||
is_start=skip_stack is None, is_end=resume_at is None)
|
||
if table.style['border_collapse'] == 'collapse':
|
||
table.skipped_rows = skipped_rows
|
||
|
||
# If the height property has a bigger value, just add blank space
|
||
# below the last row group.
|
||
table.height = max(
|
||
table.height if table.height != 'auto' else 0,
|
||
position_y - table.content_box_y())
|
||
|
||
# Layout for column groups and columns
|
||
columns_height = position_y - initial_position_y
|
||
if table.children:
|
||
# The last border spacing is below the columns.
|
||
columns_height -= border_spacing_y
|
||
for group in table.column_groups:
|
||
for column in group.children:
|
||
resolve_percentages(column, containing_block=table)
|
||
if column.grid_x < len(column_positions):
|
||
column.position_x = column_positions[column.grid_x]
|
||
column.position_y = initial_position_y
|
||
column.width = column_widths[column.grid_x]
|
||
column.height = columns_height
|
||
else:
|
||
# Ignore extra empty columns
|
||
column.position_x = 0
|
||
column.position_y = 0
|
||
column.width = 0
|
||
column.height = 0
|
||
resolve_percentages(group, containing_block=table)
|
||
column.get_cells = get_column_cells(table, column)
|
||
first = group.children[0]
|
||
last = group.children[-1]
|
||
group.position_x = first.position_x
|
||
group.position_y = initial_position_y
|
||
group.width = last.position_x + last.width - first.position_x
|
||
group.height = columns_height
|
||
|
||
if resume_at and not page_is_empty and (
|
||
table.style['break_inside'] in ('avoid', 'avoid-page')):
|
||
table = None
|
||
resume_at = None
|
||
adjoining_margins = []
|
||
collapsing_through = False
|
||
return table, resume_at, next_page, adjoining_margins, collapsing_through
|
||
|
||
|
||
def add_top_padding(box, extra_padding):
|
||
"""Increase the top padding of a box. This also translates the children.
|
||
"""
|
||
box.padding_top += extra_padding
|
||
for child in box.children:
|
||
child.translate(dy=extra_padding)
|
||
|
||
|
||
def fixed_table_layout(box):
|
||
"""Run the fixed table layout and return a list of column widths
|
||
|
||
http://www.w3.org/TR/CSS21/tables.html#fixed-table-layout
|
||
|
||
"""
|
||
table = box.get_wrapped_table()
|
||
assert table.width != 'auto'
|
||
|
||
all_columns = [column for column_group in table.column_groups
|
||
for column in column_group.children]
|
||
if table.children and table.children[0].children:
|
||
first_rowgroup = table.children[0]
|
||
first_row_cells = first_rowgroup.children[0].children
|
||
else:
|
||
first_row_cells = []
|
||
num_columns = max(
|
||
len(all_columns),
|
||
sum(cell.colspan for cell in first_row_cells)
|
||
)
|
||
# ``None`` means not know yet.
|
||
column_widths = [None] * num_columns
|
||
|
||
# `width` on column boxes
|
||
for i, column in enumerate(all_columns):
|
||
resolve_one_percentage(column, 'width', table.width)
|
||
if column.width != 'auto':
|
||
column_widths[i] = column.width
|
||
|
||
if table.style['border_collapse'] == 'separate':
|
||
border_spacing_x, _ = table.style['border_spacing']
|
||
else:
|
||
border_spacing_x = 0
|
||
|
||
# `width` on cells of the first row.
|
||
i = 0
|
||
for cell in first_row_cells:
|
||
resolve_percentages(cell, table)
|
||
if cell.width != 'auto':
|
||
width = cell.border_width()
|
||
width -= border_spacing_x * (cell.colspan - 1)
|
||
# In the general case, this width affects several columns (through
|
||
# colspan) some of which already have a width. Subtract these
|
||
# known widths and divide among remaining columns.
|
||
columns_without_width = [] # and occupied by this cell
|
||
for j in range(i, i + cell.colspan):
|
||
if column_widths[j] is None:
|
||
columns_without_width.append(j)
|
||
else:
|
||
width -= column_widths[j]
|
||
if columns_without_width:
|
||
width_per_column = width / len(columns_without_width)
|
||
for j in columns_without_width:
|
||
column_widths[j] = width_per_column
|
||
del width
|
||
i += cell.colspan
|
||
del i
|
||
|
||
# Distribute the remaining space equally on columns that do not have
|
||
# a width yet.
|
||
all_border_spacing = border_spacing_x * (num_columns + 1)
|
||
min_table_width = (sum(w for w in column_widths if w is not None) +
|
||
all_border_spacing)
|
||
columns_without_width = [i for i, w in enumerate(column_widths)
|
||
if w is None]
|
||
if columns_without_width and table.width >= min_table_width:
|
||
remaining_width = table.width - min_table_width
|
||
width_per_column = remaining_width / len(columns_without_width)
|
||
for i in columns_without_width:
|
||
column_widths[i] = width_per_column
|
||
else:
|
||
# XXX this is bad, but we were given a broken table to work with...
|
||
for i in columns_without_width:
|
||
column_widths[i] = 0
|
||
|
||
# If the sum is less than the table width,
|
||
# distribute the remaining space equally
|
||
extra_width = table.width - sum(column_widths) - all_border_spacing
|
||
if extra_width <= 0:
|
||
# substract a negative: widen the table
|
||
table.width -= extra_width
|
||
elif num_columns:
|
||
extra_per_column = extra_width / num_columns
|
||
column_widths = [w + extra_per_column for w in column_widths]
|
||
|
||
# Now we have table.width == sum(column_widths) + all_border_spacing
|
||
# with possible floating point rounding errors.
|
||
# (unless there is zero column)
|
||
table.column_widths = column_widths
|
||
|
||
|
||
def auto_table_layout(context, box, containing_block):
|
||
"""Run the auto table layout and return a list of column widths.
|
||
|
||
http://www.w3.org/TR/CSS21/tables.html#auto-table-layout
|
||
|
||
"""
|
||
table = box.get_wrapped_table()
|
||
(table_min_content_width, table_max_content_width,
|
||
column_min_content_widths, column_max_content_widths,
|
||
column_intrinsic_percentages, constrainedness,
|
||
total_horizontal_border_spacing, grid) = \
|
||
table_and_columns_preferred_widths(context, box, outer=False)
|
||
|
||
margins = 0
|
||
if box.margin_left != 'auto':
|
||
margins += box.margin_left
|
||
if box.margin_right != 'auto':
|
||
margins += box.margin_right
|
||
paddings = table.padding_left + table.padding_right
|
||
|
||
cb_width, _ = containing_block
|
||
available_width = cb_width - margins - paddings
|
||
|
||
if table.style['border_collapse'] == 'collapse':
|
||
available_width -= (
|
||
table.border_left_width + table.border_right_width)
|
||
|
||
if table.width == 'auto':
|
||
if available_width <= table_min_content_width:
|
||
table.width = table_min_content_width
|
||
elif available_width < table_max_content_width:
|
||
table.width = available_width
|
||
else:
|
||
table.width = table_max_content_width
|
||
else:
|
||
if table.width < table_min_content_width:
|
||
table.width = table_min_content_width
|
||
|
||
if not grid:
|
||
table.column_widths = []
|
||
return
|
||
|
||
assignable_width = table.width - total_horizontal_border_spacing
|
||
min_content_guess = column_min_content_widths[:]
|
||
min_content_percentage_guess = column_min_content_widths[:]
|
||
min_content_specified_guess = column_min_content_widths[:]
|
||
max_content_guess = column_max_content_widths[:]
|
||
guesses = (
|
||
min_content_guess, min_content_percentage_guess,
|
||
min_content_specified_guess, max_content_guess)
|
||
for i in range(len(grid)):
|
||
if column_intrinsic_percentages[i]:
|
||
min_content_percentage_guess[i] = max(
|
||
column_intrinsic_percentages[i] / 100 * assignable_width,
|
||
column_min_content_widths[i])
|
||
min_content_specified_guess[i] = min_content_percentage_guess[i]
|
||
max_content_guess[i] = min_content_percentage_guess[i]
|
||
elif constrainedness[i]:
|
||
min_content_specified_guess[i] = column_min_content_widths[i]
|
||
|
||
if assignable_width <= sum(max_content_guess):
|
||
# Default values shouldn't be used, but we never know.
|
||
# See https://github.com/Kozea/WeasyPrint/issues/770
|
||
lower_guess = guesses[0]
|
||
upper_guess = guesses[-1]
|
||
|
||
# We have to work around floating point rounding errors here.
|
||
# The 1e-9 value comes from PEP 485.
|
||
for guess in guesses:
|
||
if sum(guess) <= assignable_width * (1 + 1e-9):
|
||
lower_guess = guess
|
||
else:
|
||
break
|
||
for guess in guesses[::-1]:
|
||
if sum(guess) >= assignable_width * (1 - 1e-9):
|
||
upper_guess = guess
|
||
else:
|
||
break
|
||
if upper_guess == lower_guess:
|
||
# TODO: Uncomment the assert when bugs #770 and #628 are closed
|
||
# Equivalent to "assert assignable_width == sum(upper_guess)"
|
||
# assert abs(assignable_width - sum(upper_guess)) <= (
|
||
# assignable_width * 1e-9)
|
||
table.column_widths = upper_guess
|
||
else:
|
||
added_widths = [
|
||
upper_guess[i] - lower_guess[i] for i in range(len(grid))]
|
||
available_ratio = (
|
||
(assignable_width - sum(lower_guess)) / sum(added_widths))
|
||
table.column_widths = [
|
||
lower_guess[i] + added_widths[i] * available_ratio
|
||
for i in range(len(grid))]
|
||
else:
|
||
table.column_widths = max_content_guess
|
||
excess_width = assignable_width - sum(max_content_guess)
|
||
excess_width = distribute_excess_width(
|
||
context, grid, excess_width, table.column_widths, constrainedness,
|
||
column_intrinsic_percentages, column_max_content_widths)
|
||
if excess_width:
|
||
if table_min_content_width < table.width - excess_width:
|
||
# Reduce the width of the size from the excess width that has
|
||
# not been distributed.
|
||
table.width -= excess_width
|
||
else:
|
||
# Break rules
|
||
columns = [i for i, column in enumerate(grid) if any(column)]
|
||
for i in columns:
|
||
table.column_widths[i] += excess_width / len(columns)
|
||
|
||
|
||
def table_wrapper_width(context, wrapper, containing_block):
|
||
"""Find the width of each column and derive the wrapper width."""
|
||
table = wrapper.get_wrapped_table()
|
||
resolve_percentages(table, containing_block)
|
||
|
||
if table.style['table_layout'] == 'fixed' and table.width != 'auto':
|
||
fixed_table_layout(wrapper)
|
||
else:
|
||
auto_table_layout(context, wrapper, containing_block)
|
||
|
||
wrapper.width = table.border_width()
|
||
|
||
|
||
def cell_baseline(cell):
|
||
"""
|
||
Return the y position of a cell’s baseline from the top of its border box.
|
||
|
||
See http://www.w3.org/TR/CSS21/tables.html#height-layout
|
||
|
||
"""
|
||
result = find_in_flow_baseline(
|
||
cell, baseline_types=(boxes.LineBox, boxes.TableRowBox))
|
||
if result is not None:
|
||
return result - cell.position_y
|
||
else:
|
||
# Default to the bottom of the content area.
|
||
return cell.border_top_width + cell.padding_top + cell.height
|
||
|
||
|
||
def find_in_flow_baseline(box, last=False, baseline_types=(boxes.LineBox,)):
|
||
"""
|
||
Return the absolute Y position for the first (or last) in-flow baseline
|
||
if any, or None.
|
||
"""
|
||
# TODO: synthetize baseline when needed
|
||
# See https://www.w3.org/TR/css-align-3/#synthesize-baseline
|
||
if isinstance(box, baseline_types):
|
||
return box.position_y + box.baseline
|
||
if isinstance(box, boxes.ParentBox) and not isinstance(
|
||
box, boxes.TableCaptionBox):
|
||
children = reversed(box.children) if last else box.children
|
||
for child in children:
|
||
if child.is_in_normal_flow():
|
||
result = find_in_flow_baseline(child, last, baseline_types)
|
||
if result is not None:
|
||
return result
|
||
|
||
|
||
def distribute_excess_width(context, grid, excess_width, column_widths,
|
||
constrainedness, column_intrinsic_percentages,
|
||
column_max_content_widths,
|
||
column_slice=slice(0, None)):
|
||
"""Distribute available width to columns.
|
||
|
||
Return excess width left when it's impossible without breaking rules.
|
||
|
||
See http://dbaron.org/css/intrinsic/#distributetocols
|
||
|
||
"""
|
||
# First group
|
||
columns = [
|
||
(i + column_slice.start, column)
|
||
for i, column in enumerate(grid[column_slice])
|
||
if not constrainedness[i + column_slice.start] and
|
||
column_intrinsic_percentages[i + column_slice.start] == 0 and
|
||
column_max_content_widths[i + column_slice.start] > 0]
|
||
if columns:
|
||
current_widths = [column_widths[i] for i, column in columns]
|
||
differences = [
|
||
max(0, width[0] - width[1])
|
||
for width in zip(column_max_content_widths, current_widths)]
|
||
if sum(differences) > excess_width:
|
||
differences = [
|
||
difference / sum(differences) * excess_width
|
||
for difference in differences]
|
||
excess_width -= sum(differences)
|
||
for i, difference in enumerate(differences):
|
||
column_widths[columns[i][0]] += difference
|
||
if excess_width <= 0:
|
||
return
|
||
|
||
# Second group
|
||
columns = [
|
||
i + column_slice.start for i, column in enumerate(grid[column_slice])
|
||
if not constrainedness[i + column_slice.start] and
|
||
column_intrinsic_percentages[i + column_slice.start] == 0]
|
||
if columns:
|
||
for i in columns:
|
||
column_widths[i] += excess_width / len(columns)
|
||
return
|
||
|
||
# Third group
|
||
columns = [
|
||
(i + column_slice.start, column)
|
||
for i, column in enumerate(grid[column_slice])
|
||
if constrainedness[i + column_slice.start] and
|
||
column_intrinsic_percentages[i + column_slice.start] == 0 and
|
||
column_max_content_widths[i + column_slice.start] > 0]
|
||
if columns:
|
||
current_widths = [column_widths[i] for i, column in columns]
|
||
differences = [
|
||
max(0, width[0] - width[1])
|
||
for width in zip(column_max_content_widths, current_widths)]
|
||
if sum(differences) > excess_width:
|
||
differences = [
|
||
difference / sum(differences) * excess_width
|
||
for difference in differences]
|
||
excess_width -= sum(differences)
|
||
for i, difference in enumerate(differences):
|
||
column_widths[columns[i][0]] += difference
|
||
if excess_width <= 0:
|
||
return
|
||
|
||
# Fourth group
|
||
columns = [
|
||
(i + column_slice.start, column)
|
||
for i, column in enumerate(grid[column_slice])
|
||
if column_intrinsic_percentages[i + column_slice.start] > 0]
|
||
if columns:
|
||
fixed_width = sum(
|
||
column_widths[j] for j in range(len(grid))
|
||
if j not in [i for i, column in columns])
|
||
percentage_width = sum(
|
||
column_intrinsic_percentages[i]
|
||
for i, column in columns)
|
||
if fixed_width and percentage_width >= 100:
|
||
# Sum of the percentages are greater than 100%
|
||
ratio = excess_width
|
||
elif fixed_width == 0:
|
||
# No fixed width, let's take the whole excess width
|
||
ratio = excess_width
|
||
else:
|
||
ratio = fixed_width / (100 - percentage_width)
|
||
|
||
widths = [
|
||
column_intrinsic_percentages[i] * ratio for i, column in columns]
|
||
current_widths = [column_widths[i] for i, column in columns]
|
||
# Allow to reduce the size of the columns to respect the percentage
|
||
differences = [
|
||
width[0] - width[1]
|
||
for width in zip(widths, current_widths)]
|
||
if sum(differences) > excess_width:
|
||
differences = [
|
||
difference / sum(differences) * excess_width
|
||
for difference in differences]
|
||
excess_width -= sum(differences)
|
||
for i, difference in enumerate(differences):
|
||
column_widths[columns[i][0]] += difference
|
||
if excess_width <= 0:
|
||
return
|
||
|
||
# Bonus: we've tried our best to distribute the extra size, but we
|
||
# failed. Instead of blindly distributing the size among all the colums
|
||
# and breaking all the rules (as said in the draft), let's try to
|
||
# change the columns with no constraint at all, then resize the table,
|
||
# and at least break the rules to make the columns fill the table.
|
||
|
||
# Fifth group, part 1
|
||
columns = [
|
||
i + column_slice.start for i, column in enumerate(grid[column_slice])
|
||
if any(column) and
|
||
column_intrinsic_percentages[i + column_slice.start] == 0 and
|
||
not any(
|
||
max_content_width(context, cell)
|
||
for cell in column if cell)]
|
||
if columns:
|
||
for i in columns:
|
||
column_widths[i] += excess_width / len(columns)
|
||
return
|
||
|
||
# Fifth group, part 2, aka abort
|
||
return excess_width
|