Libraries: Move to Userland/Libraries/

Userland/Libraries/LibWeb/Layout/Box.cpp

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+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibGUI/Painter.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/HTML/HTMLBodyElement.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/Box.h>
+#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Painting/BorderPainting.h>
+
+namespace Web::Layout {
+
+void Box::paint(PaintContext& context, PaintPhase phase)
+{
+    if (!is_visible())
+        return;
+
+    Gfx::PainterStateSaver saver(context.painter());
+    if (is_fixed_position())
+        context.painter().translate(context.scroll_offset());
+
+    Gfx::FloatRect padded_rect;
+    padded_rect.set_x(absolute_x() - box_model().padding.left);
+    padded_rect.set_width(width() + box_model().padding.left + box_model().padding.right);
+    padded_rect.set_y(absolute_y() - box_model().padding.top);
+    padded_rect.set_height(height() + box_model().padding.top + box_model().padding.bottom);
+
+    if (phase == PaintPhase::Background && !is_body()) {
+        context.painter().fill_rect(enclosing_int_rect(padded_rect), computed_values().background_color());
+
+        if (background_image() && background_image()->bitmap())
+            context.painter().draw_tiled_bitmap(enclosing_int_rect(padded_rect), *background_image()->bitmap());
+    }
+
+    if (phase == PaintPhase::Border) {
+        Gfx::FloatRect bordered_rect;
+        bordered_rect.set_x(padded_rect.x() - box_model().border.left);
+        bordered_rect.set_width(padded_rect.width() + box_model().border.left + box_model().border.right);
+        bordered_rect.set_y(padded_rect.y() - box_model().border.top);
+        bordered_rect.set_height(padded_rect.height() + box_model().border.top + box_model().border.bottom);
+
+        Painting::paint_border(context, Painting::BorderEdge::Left, bordered_rect, computed_values());
+        Painting::paint_border(context, Painting::BorderEdge::Right, bordered_rect, computed_values());
+        Painting::paint_border(context, Painting::BorderEdge::Top, bordered_rect, computed_values());
+        Painting::paint_border(context, Painting::BorderEdge::Bottom, bordered_rect, computed_values());
+    }
+
+    Layout::NodeWithStyleAndBoxModelMetrics::paint(context, phase);
+
+    if (phase == PaintPhase::Overlay && dom_node() && document().inspected_node() == dom_node()) {
+        auto content_rect = absolute_rect();
+
+        auto margin_box = box_model().margin_box();
+        Gfx::FloatRect margin_rect;
+        margin_rect.set_x(absolute_x() - margin_box.left);
+        margin_rect.set_width(width() + margin_box.left + margin_box.right);
+        margin_rect.set_y(absolute_y() - margin_box.top);
+        margin_rect.set_height(height() + margin_box.top + margin_box.bottom);
+
+        context.painter().draw_rect(enclosing_int_rect(margin_rect), Color::Yellow);
+        context.painter().draw_rect(enclosing_int_rect(padded_rect), Color::Cyan);
+        context.painter().draw_rect(enclosing_int_rect(content_rect), Color::Magenta);
+    }
+
+    if (phase == PaintPhase::FocusOutline && dom_node() && dom_node()->is_element() && downcast<DOM::Element>(*dom_node()).is_focused()) {
+        context.painter().draw_rect(enclosing_int_rect(absolute_rect()), context.palette().focus_outline());
+    }
+}
+
+HitTestResult Box::hit_test(const Gfx::IntPoint& position, HitTestType type) const
+{
+    // FIXME: It would be nice if we could confidently skip over hit testing
+    //        parts of the layout tree, but currently we can't just check
+    //        m_rect.contains() since inline text rects can't be trusted..
+    HitTestResult result { absolute_rect().contains(position.x(), position.y()) ? this : nullptr };
+    for_each_child_in_paint_order([&](auto& child) {
+        auto child_result = child.hit_test(position, type);
+        if (child_result.layout_node)
+            result = child_result;
+    });
+    return result;
+}
+
+void Box::set_needs_display()
+{
+    if (!is_inline()) {
+        frame().set_needs_display(enclosing_int_rect(absolute_rect()));
+        return;
+    }
+
+    Node::set_needs_display();
+}
+
+bool Box::is_body() const
+{
+    return dom_node() && dom_node() == document().body();
+}
+
+void Box::set_offset(const Gfx::FloatPoint& offset)
+{
+    if (m_offset == offset)
+        return;
+    m_offset = offset;
+    did_set_rect();
+}
+
+void Box::set_size(const Gfx::FloatSize& size)
+{
+    if (m_size == size)
+        return;
+    m_size = size;
+    did_set_rect();
+}
+
+Gfx::FloatPoint Box::effective_offset() const
+{
+    if (m_containing_line_box_fragment)
+        return m_containing_line_box_fragment->offset();
+    return m_offset;
+}
+
+const Gfx::FloatRect Box::absolute_rect() const
+{
+    Gfx::FloatRect rect { effective_offset(), size() };
+    for (auto* block = containing_block(); block; block = block->containing_block()) {
+        rect.move_by(block->effective_offset());
+    }
+    return rect;
+}
+
+void Box::set_containing_line_box_fragment(LineBoxFragment& fragment)
+{
+    m_containing_line_box_fragment = fragment.make_weak_ptr();
+}
+
+StackingContext* Box::enclosing_stacking_context()
+{
+    for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
+        if (!is<Box>(ancestor))
+            continue;
+        auto& ancestor_box = downcast<Box>(*ancestor);
+        if (!ancestor_box.establishes_stacking_context())
+            continue;
+        ASSERT(ancestor_box.stacking_context());
+        return ancestor_box.stacking_context();
+    }
+    // We should always reach the Layout::InitialContainingBlockBox stacking context.
+    ASSERT_NOT_REACHED();
+}
+
+bool Box::establishes_stacking_context() const
+{
+    if (!has_style())
+        return false;
+    if (dom_node() == document().root())
+        return true;
+    auto position = computed_values().position();
+    auto z_index = computed_values().z_index();
+    if (position == CSS::Position::Absolute || position == CSS::Position::Relative) {
+        if (z_index.has_value())
+            return true;
+    }
+    if (position == CSS::Position::Fixed || position == CSS::Position::Sticky)
+        return true;
+    return false;
+}
+
+LineBox& Box::ensure_last_line_box()
+{
+    if (m_line_boxes.is_empty())
+        return add_line_box();
+    return m_line_boxes.last();
+}
+
+LineBox& Box::add_line_box()
+{
+    m_line_boxes.append(LineBox());
+    return m_line_boxes.last();
+}
+
+float Box::width_of_logical_containing_block() const
+{
+    auto* containing_block = this->containing_block();
+    ASSERT(containing_block);
+    return containing_block->width();
+}
+
+}