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resolves asciidoctor#353 add example with tests of extended converter…
… that supports image float
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,80 @@ | ||
class PDFConverterImageFloat < (Asciidoctor::Converter.for 'pdf') | ||
register_for 'pdf' | ||
|
||
def convert_paragraph node | ||
prev_sibling = (self_idx = (siblings = node.parent.blocks).index node) > 0 ? siblings[self_idx - 1] : nil | ||
if (prev_sibling&.context == :image && (float_to = prev_sibling.attr 'float')) || (@float_box ||= nil) | ||
start_cursor = cursor # start_cursor is always start of block below image | ||
roles = node.roles | ||
text_align = (resolve_text_align_from_role roles, query_theme: true, remove_predefined: true) || @base_text_align.to_sym | ||
para_font_descender = para_font_size = nil | ||
if roles.empty? | ||
para_font_descender = font.descender | ||
para_font_size = font_size | ||
line_metrics = calc_line_metrics @base_line_height | ||
else | ||
line_metrics = theme_font_cascade (role_keys = roles.map {|role| %(role_#{role}).to_sym }) do | ||
para_font_descender = font.descender | ||
para_font_size = font_size | ||
calc_line_metrics @base_line_height | ||
end | ||
end | ||
if (float_box = @float_box) | ||
@float_box = nil | ||
float_box[:at][1] -= line_metrics.padding_top # typeset_text with box doesn't add line_metrics padding | ||
else | ||
float_gap_s, float_gap_b = ::Array === (float_gap = theme.image_float_gap) ? float_gap : [float_gap || 12, float_gap || 6] | ||
float_w = (prev_sibling.attr 'rendered-width') + float_gap_s | ||
float_h = (prev_sibling.attr 'rendered-height') + (prev_sibling.attr 'caption-height', 0) + float_gap_b | ||
if (box_w = bounds.width - float_w) < para_font_size | ||
prev_sibling.remove_attr 'float' | ||
return convert_paragraph node | ||
end | ||
box_t = start_cursor + (float_h - float_gap_b) + theme.block_margin_bottom | ||
box_l = float_to == 'right' ? 0 : float_w | ||
box_t -= line_metrics.padding_top # typeset_text with box doesn't add line_metrics padding | ||
# NOTE: allocate at least one whole empty line below image | ||
line_height_length = line_metrics.height + line_metrics.leading + line_metrics.padding_top | ||
float_box = { at: [box_l, box_t], width: box_w, height: [box_t, float_h + line_height_length].min } | ||
end | ||
float_box[:final_gap] = para_font_descender + line_metrics.padding_bottom | ||
add_dest_for_block node if node.id | ||
end_cursor = nil | ||
prose_opts = float_box.merge align: text_align, hyphenate: true, margin_bottom: 0, draw_text_callback: (proc do |text, opts| | ||
draw_text! text, opts | ||
end_cursor = opts[:at][1] | ||
end) | ||
if role_keys | ||
remaining = theme_font_cascade(role_keys) { ink_prose node.content, prose_opts } | ||
else | ||
remaining = ink_prose node.content, prose_opts | ||
end | ||
end_cursor = end_cursor ? end_cursor - float_box[:final_gap] : start_cursor | ||
if remaining.empty? | ||
if siblings[self_idx + 1]&.context == :paragraph | ||
end_cursor -= theme.prose_margin_bottom | ||
inked_height = float_box[:at][1] - end_cursor | ||
if (float_box[:height] -= inked_height) > 0 | ||
float_box[:at][1] -= inked_height | ||
float_box[:line_metrics] = line_metrics | ||
@float_box = float_box | ||
else | ||
move_cursor_to end_cursor | ||
end | ||
else | ||
move_cursor_to start_cursor | ||
end | ||
else | ||
move_cursor_to end_cursor | ||
if role_keys | ||
theme_font_cascade(role_keys) { typeset_formatted_text remaining, line_metrics, align: text_align } | ||
else | ||
typeset_formatted_text remaining, line_metrics, align: text_align | ||
end | ||
theme_margin :prose, :bottom, (next_enclosed_block node) | ||
end | ||
else | ||
super | ||
end | ||
end | ||
end |
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