mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 04:52:45 +00:00
830a57c6b2
Let's rename this to LibWeb since it aims to provide more parts of the web platform than just HTML. :^)
237 lines
7.8 KiB
C++
237 lines
7.8 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 <AK/StringBuilder.h>
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#include <AK/Utf8View.h>
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#include <LibCore/DirIterator.h>
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#include <LibGfx/Font.h>
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#include <LibGUI/Painter.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/Layout/LayoutBlock.h>
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#include <LibWeb/Layout/LayoutText.h>
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#include <ctype.h>
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namespace Web {
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LayoutText::LayoutText(const Text& text)
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: LayoutNode(&text)
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{
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set_inline(true);
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}
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LayoutText::~LayoutText()
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{
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}
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static bool is_all_whitespace(const String& string)
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{
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for (size_t i = 0; i < string.length(); ++i) {
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if (!isspace(string[i]))
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return false;
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}
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return true;
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}
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const String& LayoutText::text_for_style(const StyleProperties& style) const
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{
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static String one_space = " ";
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if (is_all_whitespace(node().data())) {
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if (style.string_or_fallback(CSS::PropertyID::WhiteSpace, "normal") == "normal")
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return one_space;
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}
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return node().data();
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}
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void LayoutText::render_fragment(RenderingContext& context, const LineBoxFragment& fragment) const
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{
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auto& painter = context.painter();
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painter.set_font(style().font());
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auto background_color = style().property(CSS::PropertyID::BackgroundColor);
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if (background_color.has_value() && background_color.value()->is_color())
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painter.fill_rect(enclosing_int_rect(fragment.rect()), background_color.value()->to_color(document()));
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auto color = style().color_or_fallback(CSS::PropertyID::Color, document(), context.palette().base_text());
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auto text_decoration = style().string_or_fallback(CSS::PropertyID::TextDecoration, "none");
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if (document().inspected_node() == &node())
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context.painter().draw_rect(enclosing_int_rect(fragment.rect()), Color::Magenta);
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bool is_underline = text_decoration == "underline";
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if (is_underline)
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painter.draw_line(enclosing_int_rect(fragment.rect()).bottom_left().translated(0, 1), enclosing_int_rect(fragment.rect()).bottom_right().translated(0, 1), color);
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painter.draw_text(enclosing_int_rect(fragment.rect()), m_text_for_rendering.substring_view(fragment.start(), fragment.length()), Gfx::TextAlignment::TopLeft, color);
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}
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template<typename Callback>
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void LayoutText::for_each_word(Callback callback) const
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{
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Utf8View view(m_text_for_rendering);
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if (view.is_empty())
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return;
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auto start_of_word = view.begin();
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auto commit_word = [&](auto it) {
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int start = view.byte_offset_of(start_of_word);
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int length = view.byte_offset_of(it) - view.byte_offset_of(start_of_word);
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if (length > 0) {
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callback(view.substring_view(start, length), start, length);
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}
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start_of_word = it;
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};
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bool last_was_space = isspace(*view.begin());
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for (auto it = view.begin(); it != view.end();) {
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bool is_space = isspace(*it);
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if (is_space == last_was_space) {
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++it;
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continue;
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}
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last_was_space = is_space;
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commit_word(it);
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++it;
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}
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if (start_of_word != view.end())
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commit_word(view.end());
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}
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void LayoutText::split_preformatted_into_lines(LayoutBlock& container)
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{
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auto& font = style().font();
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auto& line_boxes = container.line_boxes();
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m_text_for_rendering = node().data();
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Utf8View view(m_text_for_rendering);
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if (view.is_empty())
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return;
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auto start_of_line = view.begin();
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auto commit_line = [&](auto it) {
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int start = view.byte_offset_of(start_of_line);
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int length = view.byte_offset_of(it) - view.byte_offset_of(start_of_line);
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if (length > 0)
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line_boxes.last().add_fragment(*this, start, length, font.width(view), font.glyph_height());
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};
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bool last_was_newline = false;
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for (auto it = view.begin(); it != view.end();) {
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bool did_commit = false;
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if (*it == '\n') {
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commit_line(it);
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line_boxes.append(LineBox());
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did_commit = true;
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last_was_newline = true;
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} else {
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last_was_newline = false;
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}
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++it;
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if (did_commit)
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start_of_line = it;
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}
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if (start_of_line != view.end() || last_was_newline)
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commit_line(view.end());
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}
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void LayoutText::split_into_lines(LayoutBlock& container)
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{
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auto& font = style().font();
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float space_width = font.glyph_width(' ') + font.glyph_spacing();
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auto& line_boxes = container.line_boxes();
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if (line_boxes.is_empty())
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line_boxes.append(LineBox());
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float available_width = container.width() - line_boxes.last().width();
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if (style().string_or_fallback(CSS::PropertyID::WhiteSpace, "normal") == "pre") {
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split_preformatted_into_lines(container);
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return;
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}
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// Collapse whitespace into single spaces
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auto utf8_view = Utf8View(node().data());
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StringBuilder builder(node().data().length());
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for (auto it = utf8_view.begin(); it != utf8_view.end(); ++it) {
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if (!isspace(*it)) {
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builder.append(utf8_view.as_string().characters_without_null_termination() + utf8_view.byte_offset_of(it), it.codepoint_length_in_bytes());
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} else {
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builder.append(' ');
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auto prev = it;
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while (it != utf8_view.end() && isspace(*it)) {
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prev = it;
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++it;
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}
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it = prev;
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}
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}
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m_text_for_rendering = builder.to_string();
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struct Word {
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Utf8View view;
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int start;
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int length;
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};
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Vector<Word> words;
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for_each_word([&](const Utf8View& view, int start, int length) {
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words.append({ Utf8View(view), start, length });
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});
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for (size_t i = 0; i < words.size(); ++i) {
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auto& word = words[i];
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float word_width;
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bool is_whitespace = isspace(*word.view.begin());
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if (is_whitespace)
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word_width = space_width;
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else
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word_width = font.width(word.view) + font.glyph_spacing();
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if (line_boxes.last().width() > 0 && word_width > available_width) {
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line_boxes.append(LineBox());
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available_width = container.width();
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}
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if (is_whitespace && line_boxes.last().fragments().is_empty())
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continue;
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line_boxes.last().add_fragment(*this, word.start, is_whitespace ? 1 : word.length, word_width, font.glyph_height());
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available_width -= word_width;
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if (available_width < 0) {
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line_boxes.append(LineBox());
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available_width = container.width();
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}
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}
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}
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}
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