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e2b4fef6c7
The text cursor follows slightly different "intuitive" rules than the regular hit testing. Clicking past the right edge of a text box should still "hit" the text box, and place the cursor at its end, for example. We solve this by adding a HitTestType enum that is passed to hit_test() and determines whether past-the-edge candidates are considered.
257 lines
9.3 KiB
C++
257 lines
9.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibGUI/Painter.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Layout/LayoutBlock.h>
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#include <LibWeb/Layout/LayoutDocument.h>
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#include <LibWeb/Layout/LayoutNode.h>
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#include <LibWeb/Layout/LayoutReplaced.h>
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#include <LibWeb/Page/Frame.h>
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namespace Web {
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LayoutNode::LayoutNode(DOM::Document& document, DOM::Node* node)
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: m_document(document)
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, m_node(node)
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{
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if (m_node)
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m_node->set_layout_node({}, this);
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}
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LayoutNode::~LayoutNode()
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{
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if (m_node && m_node->layout_node() == this)
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m_node->set_layout_node({}, nullptr);
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}
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void LayoutNode::layout(LayoutMode layout_mode)
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{
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for_each_child([&](auto& child) {
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child.layout(layout_mode);
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});
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}
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bool LayoutNode::can_contain_boxes_with_position_absolute() const
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{
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return style().position() != CSS::Position::Static || is_root();
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}
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const LayoutBlock* LayoutNode::containing_block() const
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{
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auto nearest_block_ancestor = [this] {
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auto* ancestor = parent();
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while (ancestor && !is<LayoutBlock>(*ancestor))
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ancestor = ancestor->parent();
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return downcast<LayoutBlock>(ancestor);
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};
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if (is_text())
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return nearest_block_ancestor();
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auto position = style().position();
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if (position == CSS::Position::Absolute) {
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auto* ancestor = parent();
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while (ancestor && !ancestor->can_contain_boxes_with_position_absolute())
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ancestor = ancestor->parent();
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while (ancestor && (!is<LayoutBlock>(ancestor) || ancestor->is_anonymous()))
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ancestor = ancestor->containing_block();
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return downcast<LayoutBlock>(ancestor);
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}
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if (position == CSS::Position::Fixed)
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return &root();
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return nearest_block_ancestor();
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}
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void LayoutNode::paint(PaintContext& context, PaintPhase phase)
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{
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if (!is_visible())
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return;
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for_each_child([&](auto& child) {
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if (child.is_box() && downcast<LayoutBox>(child).stacking_context())
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return;
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child.paint(context, phase);
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});
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}
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HitTestResult LayoutNode::hit_test(const Gfx::IntPoint& position, HitTestType type) const
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{
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HitTestResult result;
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for_each_child([&](auto& child) {
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// Skip over children that establish their own stacking context.
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// The outer loop who called us will take care of those.
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if (is<LayoutBox>(child) && downcast<LayoutBox>(child).stacking_context())
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return;
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auto child_result = child.hit_test(position, type);
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if (child_result.layout_node)
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result = child_result;
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});
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return result;
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}
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const Frame& LayoutNode::frame() const
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{
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ASSERT(document().frame());
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return *document().frame();
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}
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Frame& LayoutNode::frame()
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{
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ASSERT(document().frame());
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return *document().frame();
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}
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const LayoutDocument& LayoutNode::root() const
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{
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ASSERT(document().layout_node());
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return *document().layout_node();
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}
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LayoutDocument& LayoutNode::root()
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{
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ASSERT(document().layout_node());
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return *document().layout_node();
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}
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void LayoutNode::split_into_lines(LayoutBlock& container, LayoutMode layout_mode)
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{
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for_each_child([&](auto& child) {
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child.split_into_lines(container, layout_mode);
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});
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}
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void LayoutNode::set_needs_display()
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{
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if (auto* block = containing_block()) {
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block->for_each_fragment([&](auto& fragment) {
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if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
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frame().set_needs_display(enclosing_int_rect(fragment.absolute_rect()));
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}
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return IterationDecision::Continue;
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});
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}
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}
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float LayoutNode::font_size() const
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{
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// FIXME: This doesn't work right for relative font-sizes
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auto length = specified_style().length_or_fallback(CSS::PropertyID::FontSize, CSS::Length(10, CSS::Length::Type::Px));
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return length.raw_value();
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}
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Gfx::FloatPoint LayoutNode::box_type_agnostic_position() const
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{
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if (is_box())
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return downcast<LayoutBox>(*this).absolute_position();
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ASSERT(is_inline());
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Gfx::FloatPoint position;
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if (auto* block = containing_block()) {
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block->for_each_fragment([&](auto& fragment) {
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if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
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position = fragment.absolute_rect().location();
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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}
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return position;
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}
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bool LayoutNode::is_floating() const
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{
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if (!has_style())
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return false;
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return style().float_() != CSS::Float::None;
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}
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bool LayoutNode::is_absolutely_positioned() const
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{
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if (!has_style())
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return false;
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auto position = style().position();
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return position == CSS::Position::Absolute || position == CSS::Position::Fixed;
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}
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bool LayoutNode::is_fixed_position() const
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{
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if (!has_style())
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return false;
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auto position = style().position();
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return position == CSS::Position::Fixed;
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}
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LayoutNodeWithStyle::LayoutNodeWithStyle(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> specified_style)
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: LayoutNode(document, node)
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, m_specified_style(move(specified_style))
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{
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m_has_style = true;
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apply_style(*m_specified_style);
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}
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void LayoutNodeWithStyle::apply_style(const CSS::StyleProperties& specified_style)
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{
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auto& style = static_cast<MutableLayoutStyle&>(m_style);
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style.set_position(specified_style.position());
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style.set_text_align(specified_style.text_align());
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auto white_space = specified_style.white_space();
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if (white_space.has_value())
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style.set_white_space(white_space.value());
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auto float_ = specified_style.float_();
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if (float_.has_value())
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style.set_float(float_.value());
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style.set_z_index(specified_style.z_index());
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style.set_width(specified_style.length_or_fallback(CSS::PropertyID::Width, {}));
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style.set_min_width(specified_style.length_or_fallback(CSS::PropertyID::MinWidth, {}));
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style.set_max_width(specified_style.length_or_fallback(CSS::PropertyID::MaxWidth, {}));
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style.set_height(specified_style.length_or_fallback(CSS::PropertyID::Height, {}));
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style.set_min_height(specified_style.length_or_fallback(CSS::PropertyID::MinHeight, {}));
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style.set_max_height(specified_style.length_or_fallback(CSS::PropertyID::MaxHeight, {}));
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style.set_offset(specified_style.length_box(CSS::PropertyID::Left, CSS::PropertyID::Top, CSS::PropertyID::Right, CSS::PropertyID::Bottom));
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style.set_margin(specified_style.length_box(CSS::PropertyID::MarginLeft, CSS::PropertyID::MarginTop, CSS::PropertyID::MarginRight, CSS::PropertyID::MarginBottom));
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style.set_padding(specified_style.length_box(CSS::PropertyID::PaddingLeft, CSS::PropertyID::PaddingTop, CSS::PropertyID::PaddingRight, CSS::PropertyID::PaddingBottom));
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style.border_left().width = specified_style.length_or_fallback(CSS::PropertyID::BorderLeftWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
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style.border_top().width = specified_style.length_or_fallback(CSS::PropertyID::BorderTopWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
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style.border_right().width = specified_style.length_or_fallback(CSS::PropertyID::BorderRightWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
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style.border_bottom().width = specified_style.length_or_fallback(CSS::PropertyID::BorderBottomWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
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style.border_left().color = specified_style.color_or_fallback(CSS::PropertyID::BorderLeftColor, document(), Color::Transparent);
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style.border_top().color = specified_style.color_or_fallback(CSS::PropertyID::BorderTopColor, document(), Color::Transparent);
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style.border_right().color = specified_style.color_or_fallback(CSS::PropertyID::BorderRightColor, document(), Color::Transparent);
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style.border_bottom().color = specified_style.color_or_fallback(CSS::PropertyID::BorderBottomColor, document(), Color::Transparent);
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}
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}
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