4190fd2199
Our "frame" concept very closely matches what the web specs call a "browsing context", so let's rename it to that. :^) The "main frame" becomes the "top-level browsing context", and "sub-frames" are now "nested browsing contexts".
116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/FontDatabase.h>
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#include <LibGfx/Painter.h>
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#include <LibGfx/StylePainter.h>
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#include <LibWeb/Layout/ImageBox.h>
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#include <LibWeb/Page/BrowsingContext.h>
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namespace Web::Layout {
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ImageBox::ImageBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style, const ImageLoader& image_loader)
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: ReplacedBox(document, element, move(style))
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, m_image_loader(image_loader)
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{
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browsing_context().register_viewport_client(*this);
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}
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ImageBox::~ImageBox()
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{
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browsing_context().unregister_viewport_client(*this);
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}
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int ImageBox::preferred_width() const
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{
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return dom_node().attribute(HTML::AttributeNames::width).to_int().value_or(m_image_loader.width());
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}
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int ImageBox::preferred_height() const
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{
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return dom_node().attribute(HTML::AttributeNames::height).to_int().value_or(m_image_loader.height());
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}
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void ImageBox::prepare_for_replaced_layout()
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{
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if (!m_image_loader.has_loaded_or_failed()) {
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set_has_intrinsic_width(true);
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set_has_intrinsic_height(true);
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set_intrinsic_width(0);
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set_intrinsic_height(0);
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} else {
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if (m_image_loader.width()) {
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set_has_intrinsic_width(true);
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set_intrinsic_width(m_image_loader.width());
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}
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if (m_image_loader.height()) {
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set_has_intrinsic_height(true);
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set_intrinsic_height(m_image_loader.height());
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}
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if (m_image_loader.width() && m_image_loader.height()) {
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set_has_intrinsic_ratio(true);
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set_intrinsic_ratio((float)m_image_loader.width() / (float)m_image_loader.height());
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} else {
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set_has_intrinsic_ratio(false);
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}
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}
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if (renders_as_alt_text()) {
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auto& image_element = downcast<HTML::HTMLImageElement>(dom_node());
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auto& font = Gfx::FontDatabase::default_font();
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auto alt = image_element.alt();
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if (alt.is_empty())
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alt = image_element.src();
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set_width(font.width(alt) + 16);
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set_height(font.glyph_height() + 16);
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}
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if (!has_intrinsic_width() && !has_intrinsic_height()) {
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set_width(16);
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set_height(16);
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}
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}
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void ImageBox::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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// FIXME: This should be done at a different level. Also rect() does not include padding etc!
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if (!context.viewport_rect().intersects(enclosing_int_rect(absolute_rect())))
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return;
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ReplacedBox::paint(context, phase);
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if (phase == PaintPhase::Foreground) {
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if (renders_as_alt_text()) {
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auto& image_element = downcast<HTML::HTMLImageElement>(dom_node());
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context.painter().set_font(Gfx::FontDatabase::default_font());
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Gfx::StylePainter::paint_frame(context.painter(), enclosing_int_rect(absolute_rect()), context.palette(), Gfx::FrameShape::Container, Gfx::FrameShadow::Sunken, 2);
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auto alt = image_element.alt();
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if (alt.is_empty())
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alt = image_element.src();
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context.painter().draw_text(enclosing_int_rect(absolute_rect()), alt, Gfx::TextAlignment::Center, computed_values().color(), Gfx::TextElision::Right);
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} else if (auto bitmap = m_image_loader.bitmap(m_image_loader.current_frame_index())) {
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context.painter().draw_scaled_bitmap(enclosing_int_rect(absolute_rect()), *bitmap, bitmap->rect());
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}
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}
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}
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bool ImageBox::renders_as_alt_text() const
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{
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if (is<HTML::HTMLImageElement>(dom_node()))
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return !m_image_loader.has_image();
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return false;
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}
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void ImageBox::frame_did_set_viewport_rect(const Gfx::IntRect& viewport_rect)
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{
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m_image_loader.set_visible_in_viewport(viewport_rect.to_type<float>().intersects(absolute_rect()));
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}
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}
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