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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibWeb/Dump.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/InitialContainingBlock.h>
#include <LibWeb/Layout/InlineFormattingContext.h>
#include <LibWeb/Layout/ReplacedBox.h>
#include <LibWeb/Layout/TextNode.h>
namespace Web::Layout {
BlockContainer::BlockContainer(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
: Box(document, node, move(style))
{
}
BlockContainer::BlockContainer(DOM::Document& document, DOM::Node* node, CSS::ComputedValues computed_values)
: Box(document, node, move(computed_values))
{
}
BlockContainer::~BlockContainer()
{
}
bool BlockContainer::should_clip_overflow() const
{
return computed_values().overflow_x() != CSS::Overflow::Visible && computed_values().overflow_y() != CSS::Overflow::Visible;
}
void BlockContainer::paint(PaintContext& context, PaintPhase phase)
{
if (!is_visible())
return;
Box::paint(context, phase);
if (!children_are_inline())
return;
if (should_clip_overflow()) {
context.painter().save();
// FIXME: Handle overflow-x and overflow-y being different values.
context.painter().add_clip_rect(enclosing_int_rect(padded_rect()));
context.painter().translate(-m_scroll_offset.to_type<int>());
}
for (auto& line_box : m_line_boxes) {
for (auto& fragment : line_box.fragments()) {
if (context.should_show_line_box_borders())
context.painter().draw_rect(enclosing_int_rect(fragment.absolute_rect()), Color::Green);
fragment.paint(context, phase);
}
}
if (should_clip_overflow()) {
context.painter().restore();
}
// FIXME: Merge this loop with the above somehow..
if (phase == PaintPhase::FocusOutline) {
for (auto& line_box : m_line_boxes) {
for (auto& fragment : line_box.fragments()) {
auto* node = fragment.layout_node().dom_node();
if (!node)
continue;
auto* parent = node->parent_element();
if (!parent)
continue;
if (parent->is_focused())
context.painter().draw_rect(enclosing_int_rect(fragment.absolute_rect()), context.palette().focus_outline());
}
}
}
}
HitTestResult BlockContainer::hit_test(const Gfx::IntPoint& position, HitTestType type) const
{
if (!children_are_inline())
return Box::hit_test(position, type);
HitTestResult last_good_candidate;
for (auto& line_box : m_line_boxes) {
for (auto& fragment : line_box.fragments()) {
if (is<Box>(fragment.layout_node()) && verify_cast<Box>(fragment.layout_node()).stacking_context())
continue;
if (enclosing_int_rect(fragment.absolute_rect()).contains(position)) {
if (is<BlockContainer>(fragment.layout_node()))
return verify_cast<BlockContainer>(fragment.layout_node()).hit_test(position, type);
return { fragment.layout_node(), fragment.text_index_at(position.x()) };
}
if (fragment.absolute_rect().top() <= position.y())
last_good_candidate = { fragment.layout_node(), fragment.text_index_at(position.x()) };
}
}
if (type == HitTestType::TextCursor && last_good_candidate.layout_node)
return last_good_candidate;
return { absolute_rect().contains(position.x(), position.y()) ? this : nullptr };
}
void BlockContainer::split_into_lines(InlineFormattingContext& context, LayoutMode layout_mode)
{
auto& containing_block = context.containing_block();
auto* line_box = &containing_block.ensure_last_line_box();
context.dimension_box_on_line(*this, layout_mode);
float available_width = context.available_width_at_line(containing_block.line_boxes().size() - 1);
if (layout_mode == LayoutMode::AllPossibleLineBreaks && line_box->width() > 0) {
line_box = &containing_block.add_line_box();
} else if (layout_mode == LayoutMode::Default && line_box->width() > 0 && line_box->width() + border_box_width() > available_width) {
line_box = &containing_block.add_line_box();
}
line_box->add_fragment(*this, 0, 0, border_box_width(), height());
}
bool BlockContainer::is_scrollable() const
{
// FIXME: Support horizontal scroll as well (overflow-x)
return computed_values().overflow_y() == CSS::Overflow::Scroll;
}
void BlockContainer::set_scroll_offset(const Gfx::FloatPoint& offset)
{
// FIXME: If there is horizontal and vertical scroll ignore only part of the new offset
if (offset.y() < 0 || m_scroll_offset == offset)
return;
m_scroll_offset = offset;
set_needs_display();
}
bool BlockContainer::handle_mousewheel(Badge<EventHandler>, const Gfx::IntPoint&, unsigned int, unsigned int, int wheel_delta)
{
if (!is_scrollable())
return false;
auto new_offset = m_scroll_offset;
new_offset.translate_by(0, wheel_delta);
set_scroll_offset(new_offset);
return true;
}
LineBox& BlockContainer::ensure_last_line_box()
{
if (m_line_boxes.is_empty())
return add_line_box();
return m_line_boxes.last();
}
LineBox& BlockContainer::add_line_box()
{
m_line_boxes.append(LineBox());
return m_line_boxes.last();
}
}
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