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@@ -195,6 +195,22 @@ float FormattingContext::tentative_width_for_replaced_element(const ReplacedBox&
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return used_width;
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}
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+void FormattingContext::compute_width_for_absolutely_positioned_element(Box& box)
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+{
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+ if (is<ReplacedBox>(box))
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+ compute_width_for_absolutely_positioned_replaced_element(downcast<ReplacedBox>(box));
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+ else
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+ compute_width_for_absolutely_positioned_non_replaced_element(box);
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+}
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+
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+void FormattingContext::compute_height_for_absolutely_positioned_element(Box& box)
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+{
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+ if (is<ReplacedBox>(box))
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+ compute_height_for_absolutely_positioned_replaced_element(downcast<ReplacedBox>(box));
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+ else
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+ compute_height_for_absolutely_positioned_non_replaced_element(box);
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+}
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+
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float FormattingContext::compute_width_for_replaced_element(const ReplacedBox& box)
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{
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// 10.3.4 Block-level, replaced elements in normal flow...
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@@ -279,4 +295,252 @@ float FormattingContext::compute_height_for_replaced_element(const ReplacedBox&
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return used_height;
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}
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+void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_element(Box& box)
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+{
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+ auto& containing_block = *box.containing_block();
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+ auto& computed_values = box.computed_values();
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+ auto zero_value = CSS::Length::make_px(0);
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+
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+ auto margin_left = CSS::Length::make_auto();
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+ auto margin_right = CSS::Length::make_auto();
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+ const auto border_left = computed_values.border_left().width;
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+ const auto border_right = computed_values.border_right().width;
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+ const auto padding_left = computed_values.padding().left.resolved_or_zero(box, containing_block.width());
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+ const auto padding_right = computed_values.padding().right.resolved_or_zero(box, containing_block.width());
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+
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+ auto try_compute_width = [&](const auto& a_width) {
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+ margin_left = computed_values.margin().left.resolved_or_zero(box, containing_block.width());
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+ margin_right = computed_values.margin().right.resolved_or_zero(box, containing_block.width());
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+
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+ auto left = computed_values.offset().left.resolved_or_auto(box, containing_block.width());
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+ auto right = computed_values.offset().right.resolved_or_auto(box, containing_block.width());
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+ auto width = a_width;
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+
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+ auto solve_for_left = [&] {
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+ return CSS::Length(containing_block.width() - margin_left.to_px(box) - border_left - padding_left.to_px(box) - width.to_px(box) - padding_right.to_px(box) - border_right - margin_right.to_px(box) - right.to_px(box), CSS::Length::Type::Px);
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+ };
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+
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+ auto solve_for_width = [&] {
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+ return CSS::Length(containing_block.width() - left.to_px(box) - margin_left.to_px(box) - border_left - padding_left.to_px(box) - padding_right.to_px(box) - border_right - margin_right.to_px(box) - right.to_px(box), CSS::Length::Type::Px);
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+ };
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+
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+ auto solve_for_right = [&] {
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+ return CSS::Length(containing_block.width() - left.to_px(box) - margin_left.to_px(box) - border_left - padding_left.to_px(box) - width.to_px(box) - padding_right.to_px(box) - border_right - margin_right.to_px(box), CSS::Length::Type::Px);
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+ };
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+
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+ // If all three of 'left', 'width', and 'right' are 'auto':
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+ if (left.is_auto() && width.is_auto() && right.is_auto()) {
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+ // First set any 'auto' values for 'margin-left' and 'margin-right' to 0.
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+ if (margin_left.is_auto())
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+ margin_left = CSS::Length::make_px(0);
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+ if (margin_right.is_auto())
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+ margin_right = CSS::Length::make_px(0);
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+ // Then, if the 'direction' property of the element establishing the static-position containing block
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+ // is 'ltr' set 'left' to the static position and apply rule number three below;
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+ // otherwise, set 'right' to the static position and apply rule number one below.
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+ // FIXME: This is very hackish.
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+ left = CSS::Length::make_px(0);
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+ goto Rule3;
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+ }
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+
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+ if (!left.is_auto() && !width.is_auto() && !right.is_auto()) {
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+ // FIXME: This should be solved in a more complicated way.
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+ return width;
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+ }
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+
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+ if (margin_left.is_auto())
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+ margin_left = CSS::Length::make_px(0);
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+ if (margin_right.is_auto())
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+ margin_right = CSS::Length::make_px(0);
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+
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+ // 1. 'left' and 'width' are 'auto' and 'right' is not 'auto',
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+ // then the width is shrink-to-fit. Then solve for 'left'
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+ if (left.is_auto() && width.is_auto() && !right.is_auto()) {
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+ auto result = calculate_shrink_to_fit_widths(box);
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+ solve_for_left();
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+ auto available_width = solve_for_width();
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+ width = CSS::Length(min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width), CSS::Length::Type::Px);
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+ }
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+
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+ // 2. 'left' and 'right' are 'auto' and 'width' is not 'auto',
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+ // then if the 'direction' property of the element establishing
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+ // the static-position containing block is 'ltr' set 'left'
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+ // to the static position, otherwise set 'right' to the static position.
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+ // Then solve for 'left' (if 'direction is 'rtl') or 'right' (if 'direction' is 'ltr').
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+ else if (left.is_auto() && right.is_auto() && !width.is_auto()) {
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+ // FIXME: Check direction
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+ // FIXME: Use the static-position containing block
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+ left = zero_value;
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+ right = solve_for_right();
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+ }
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+
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+ // 3. 'width' and 'right' are 'auto' and 'left' is not 'auto',
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+ // then the width is shrink-to-fit. Then solve for 'right'
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+ else if (width.is_auto() && right.is_auto() && !left.is_auto()) {
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+ Rule3:
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+ auto result = calculate_shrink_to_fit_widths(box);
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+ auto available_width = solve_for_width();
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+ width = CSS::Length(min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width), CSS::Length::Type::Px);
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+ right = solve_for_right();
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+ }
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+
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+ // 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve for 'left'
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+ else if (left.is_auto() && !width.is_auto() && !right.is_auto()) {
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+ left = solve_for_left();
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+ }
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+
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+ // 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve for 'width'
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+ else if (width.is_auto() && !left.is_auto() && !right.is_auto()) {
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+ width = solve_for_width();
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+ }
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+
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+ // 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve for 'right'
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+ else if (right.is_auto() && !left.is_auto() && !width.is_auto()) {
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+ right = solve_for_right();
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+ }
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+
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+ return width;
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+ };
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+
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+ auto specified_width = computed_values.width().resolved_or_auto(box, containing_block.width());
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+
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+ // 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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+ auto used_width = try_compute_width(specified_width);
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+
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+ // 2. The tentative used width is greater than 'max-width', the rules above are applied again,
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+ // but this time using the computed value of 'max-width' as the computed value for 'width'.
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+ auto specified_max_width = computed_values.max_width().resolved_or_auto(box, containing_block.width());
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+ if (!specified_max_width.is_auto()) {
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+ if (used_width.to_px(box) > specified_max_width.to_px(box)) {
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+ used_width = try_compute_width(specified_max_width);
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+ }
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+ }
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+
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+ // 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
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+ // but this time using the value of 'min-width' as the computed value for 'width'.
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+ auto specified_min_width = computed_values.min_width().resolved_or_auto(box, containing_block.width());
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+ if (!specified_min_width.is_auto()) {
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+ if (used_width.to_px(box) < specified_min_width.to_px(box)) {
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+ used_width = try_compute_width(specified_min_width);
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+ }
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+ }
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+
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+ box.set_width(used_width.to_px(box));
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+
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+ box.box_model().margin.left = margin_left.to_px(box);
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+ box.box_model().margin.right = margin_right.to_px(box);
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+ box.box_model().border.left = border_left;
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+ box.box_model().border.right = border_right;
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+ box.box_model().padding.left = padding_left.to_px(box);
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+ box.box_model().padding.right = padding_right.to_px(box);
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+}
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+
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+void FormattingContext::compute_width_for_absolutely_positioned_replaced_element(ReplacedBox& box)
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+{
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+ // FIXME: Implement this.
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+ return compute_width_for_absolutely_positioned_non_replaced_element(box);
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+}
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+
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+void FormattingContext::compute_height_for_absolutely_positioned_non_replaced_element(Box& box)
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+{
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+ auto& computed_values = box.computed_values();
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+ auto& containing_block = *box.containing_block();
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+
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+ CSS::Length specified_height;
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+
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+ if (computed_values.height().is_percentage() && !containing_block.computed_values().height().is_absolute()) {
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+ specified_height = CSS::Length::make_auto();
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+ } else {
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+ specified_height = computed_values.height().resolved_or_auto(box, containing_block.height());
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+ }
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+
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+ auto specified_max_height = computed_values.max_height().resolved_or_auto(box, containing_block.height());
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+
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+ box.box_model().margin.top = computed_values.margin().top.resolved_or_zero(box, containing_block.width()).to_px(box);
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+ box.box_model().margin.bottom = computed_values.margin().bottom.resolved_or_zero(box, containing_block.width()).to_px(box);
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+ box.box_model().border.top = computed_values.border_top().width;
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+ box.box_model().border.bottom = computed_values.border_bottom().width;
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+ box.box_model().padding.top = computed_values.padding().top.resolved_or_zero(box, containing_block.width()).to_px(box);
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+ box.box_model().padding.bottom = computed_values.padding().bottom.resolved_or_zero(box, containing_block.width()).to_px(box);
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+
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+ if (!specified_height.is_auto()) {
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+ float used_height = specified_height.to_px(box);
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+ if (!specified_max_height.is_auto())
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+ used_height = min(used_height, specified_max_height.to_px(box));
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+ box.set_height(used_height);
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+ }
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+}
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+
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+void FormattingContext::layout_absolutely_positioned_element(Box& box)
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+{
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+ auto& containing_block = context_box();
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+ auto& box_model = box.box_model();
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+
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+ auto specified_width = box.computed_values().width().resolved_or_auto(box, containing_block.width());
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+
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+ compute_width_for_absolutely_positioned_element(box);
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+ layout_inside(box, LayoutMode::Default);
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+ compute_height_for_absolutely_positioned_element(box);
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+
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+ box_model.margin.left = box.computed_values().margin().left.resolved_or_auto(box, containing_block.width()).to_px(box);
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+ box_model.margin.top = box.computed_values().margin().top.resolved_or_auto(box, containing_block.height()).to_px(box);
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+ box_model.margin.right = box.computed_values().margin().right.resolved_or_auto(box, containing_block.width()).to_px(box);
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+ box_model.margin.bottom = box.computed_values().margin().bottom.resolved_or_auto(box, containing_block.height()).to_px(box);
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+
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+ box_model.border.left = box.computed_values().border_left().width;
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+ box_model.border.right = box.computed_values().border_right().width;
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+ box_model.border.top = box.computed_values().border_top().width;
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+ box_model.border.bottom = box.computed_values().border_bottom().width;
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+
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+ box_model.offset.left = box.computed_values().offset().left.resolved_or_auto(box, containing_block.width()).to_px(box);
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+ box_model.offset.top = box.computed_values().offset().top.resolved_or_auto(box, containing_block.height()).to_px(box);
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+ box_model.offset.right = box.computed_values().offset().right.resolved_or_auto(box, containing_block.width()).to_px(box);
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+ box_model.offset.bottom = box.computed_values().offset().bottom.resolved_or_auto(box, containing_block.height()).to_px(box);
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+
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+ if (box.computed_values().offset().left.is_auto() && specified_width.is_auto() && box.computed_values().offset().right.is_auto()) {
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+ if (box.computed_values().margin().left.is_auto())
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+ box_model.margin.left = 0;
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+ if (box.computed_values().margin().right.is_auto())
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+ box_model.margin.right = 0;
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+ }
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+
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+ Gfx::FloatPoint used_offset;
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+
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+ if (!box.computed_values().offset().left.is_auto()) {
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+ float x_offset = box_model.offset.left
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+ + box_model.border_box().left;
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+ used_offset.set_x(x_offset + box_model.margin.left);
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+ } else if (!box.computed_values().offset().right.is_auto()) {
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+ float x_offset = 0
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+ - box_model.offset.right
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+ - box_model.border_box().right;
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+ used_offset.set_x(containing_block.width() + x_offset - box.width() - box_model.margin.right);
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+ } else {
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+ float x_offset = box_model.margin_box().left;
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+ used_offset.set_x(x_offset);
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+ }
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+
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+ if (!box.computed_values().offset().top.is_auto()) {
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+ float y_offset = box_model.offset.top
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+ + box_model.border_box().top;
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+ used_offset.set_y(y_offset + box_model.margin.top);
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+ } else if (!box.computed_values().offset().bottom.is_auto()) {
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+ float y_offset = 0
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+ - box_model.offset.bottom
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+ - box_model.border_box().bottom;
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+ used_offset.set_y(containing_block.height() + y_offset - box.height() - box_model.margin.bottom);
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+ } else {
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+ float y_offset = box_model.margin_box().top;
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+ used_offset.set_y(y_offset);
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+ }
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+
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+ box.set_offset(used_offset);
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+}
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+
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+void FormattingContext::compute_height_for_absolutely_positioned_replaced_element(ReplacedBox& box)
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+{
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+ // FIXME: Implement this.
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+ return compute_height_for_absolutely_positioned_non_replaced_element(box);
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+}
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+
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}
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Andreas Kling