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https://github.com/RGBCube/serenity
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Libraries: Move to Userland/Libraries/
This commit is contained in:
Andreas Kling
parent
dc28c07fa5
commit
13d7c09125
1857 changed files with 266 additions and 274 deletions
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/*
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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 <LibGUI/Painter.h>
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#include <LibGfx/Font.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/Layout/BlockBox.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/TextNode.h>
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#include <LibWeb/Page/Frame.h>
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#include <ctype.h>
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namespace Web::Layout {
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TextNode::TextNode(DOM::Document& document, DOM::Text& text)
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: Node(document, &text)
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{
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set_inline(true);
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}
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TextNode::~TextNode()
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{
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}
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static bool is_all_whitespace(const StringView& 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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void TextNode::paint_fragment(PaintContext& context, const LineBoxFragment& fragment, PaintPhase phase) const
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{
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auto& painter = context.painter();
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if (phase == PaintPhase::Background) {
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painter.fill_rect(enclosing_int_rect(fragment.absolute_rect()), computed_values().background_color());
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}
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if (phase == PaintPhase::Foreground) {
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painter.set_font(font());
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if (document().inspected_node() == &dom_node())
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context.painter().draw_rect(enclosing_int_rect(fragment.absolute_rect()), Color::Magenta);
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if (computed_values().text_decoration_line() == CSS::TextDecorationLine::Underline)
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painter.draw_line(enclosing_int_rect(fragment.absolute_rect()).bottom_left().translated(0, 1), enclosing_int_rect(fragment.absolute_rect()).bottom_right().translated(0, 1), computed_values().color());
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// FIXME: text-transform should be done already in layout, since uppercase glyphs may be wider than lowercase, etc.
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auto text = m_text_for_rendering;
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auto text_transform = computed_values().text_transform();
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if (text_transform == CSS::TextTransform::Uppercase)
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text = m_text_for_rendering.to_uppercase();
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if (text_transform == CSS::TextTransform::Lowercase)
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text = m_text_for_rendering.to_lowercase();
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painter.draw_text(enclosing_int_rect(fragment.absolute_rect()), text.substring_view(fragment.start(), fragment.length()), Gfx::TextAlignment::CenterLeft, computed_values().color());
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auto selection_rect = fragment.selection_rect(font());
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if (!selection_rect.is_empty()) {
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painter.fill_rect(enclosing_int_rect(selection_rect), context.palette().selection());
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Gfx::PainterStateSaver saver(painter);
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painter.add_clip_rect(enclosing_int_rect(selection_rect));
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painter.draw_text(enclosing_int_rect(fragment.absolute_rect()), text.substring_view(fragment.start(), fragment.length()), Gfx::TextAlignment::CenterLeft, context.palette().selection_text());
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}
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paint_cursor_if_needed(context, fragment);
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}
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}
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void TextNode::paint_cursor_if_needed(PaintContext& context, const LineBoxFragment& fragment) const
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{
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if (!frame().is_focused_frame())
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return;
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if (!frame().cursor_blink_state())
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return;
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if (frame().cursor_position().node() != &dom_node())
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return;
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if (!(frame().cursor_position().offset() >= (unsigned)fragment.start() && frame().cursor_position().offset() < (unsigned)(fragment.start() + fragment.length())))
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return;
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if (!fragment.layout_node().dom_node() || !fragment.layout_node().dom_node()->is_editable())
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return;
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auto fragment_rect = fragment.absolute_rect();
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float cursor_x = fragment_rect.x() + font().width(fragment.text().substring_view(0, frame().cursor_position().offset() - fragment.start()));
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float cursor_top = fragment_rect.top();
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float cursor_height = fragment_rect.height();
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Gfx::IntRect cursor_rect(cursor_x, cursor_top, 1, cursor_height);
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context.painter().draw_rect(cursor_rect, computed_values().color());
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}
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template<typename Callback>
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void TextNode::for_each_chunk(Callback callback, LayoutMode layout_mode, bool do_wrap_lines, bool do_wrap_breaks) 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_chunk = view.begin();
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auto commit_chunk = [&](auto it, bool has_breaking_newline, bool must_commit = false) {
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if (layout_mode == LayoutMode::OnlyRequiredLineBreaks && !must_commit)
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return;
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int start = view.byte_offset_of(start_of_chunk);
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int length = view.byte_offset_of(it) - view.byte_offset_of(start_of_chunk);
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if (has_breaking_newline || length > 0) {
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auto chunk_view = view.substring_view(start, length);
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callback(chunk_view, start, length, has_breaking_newline, is_all_whitespace(chunk_view.as_string()));
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}
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start_of_chunk = it;
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};
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bool last_was_space = isspace(*view.begin());
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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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if (layout_mode == LayoutMode::AllPossibleLineBreaks) {
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commit_chunk(it, false);
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}
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if (last_was_newline) {
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last_was_newline = false;
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commit_chunk(it, true);
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}
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if (do_wrap_breaks && *it == '\n') {
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last_was_newline = true;
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commit_chunk(it, false);
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}
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if (do_wrap_lines) {
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bool is_space = isspace(*it);
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if (is_space != last_was_space) {
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last_was_space = is_space;
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commit_chunk(it, false);
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}
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}
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++it;
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}
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if (last_was_newline)
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commit_chunk(view.end(), true);
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if (start_of_chunk != view.end())
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commit_chunk(view.end(), false, true);
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}
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void TextNode::split_into_lines_by_rules(InlineFormattingContext& context, LayoutMode layout_mode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks)
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{
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auto& containing_block = context.containing_block();
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auto& font = this->font();
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auto& line_boxes = containing_block.line_boxes();
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containing_block.ensure_last_line_box();
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float available_width = context.available_width_at_line(line_boxes.size() - 1) - line_boxes.last().width();
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// Collapse whitespace into single spaces
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if (do_collapse) {
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auto utf8_view = Utf8View(dom_node().data());
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StringBuilder builder(dom_node().data().length());
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auto it = utf8_view.begin();
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auto skip_over_whitespace = [&] {
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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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if (line_boxes.last().is_empty_or_ends_in_whitespace())
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skip_over_whitespace();
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for (; 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.code_point_length_in_bytes());
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} else {
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builder.append(' ');
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skip_over_whitespace();
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}
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}
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m_text_for_rendering = builder.to_string();
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} else {
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m_text_for_rendering = dom_node().data();
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}
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// do_wrap_lines => chunks_are_words
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// !do_wrap_lines => chunks_are_lines
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struct Chunk {
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Utf8View view;
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int start { 0 };
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int length { 0 };
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bool is_break { false };
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bool is_all_whitespace { false };
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};
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Vector<Chunk, 128> chunks;
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for_each_chunk(
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[&](const Utf8View& view, int start, int length, bool is_break, bool is_all_whitespace) {
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chunks.append({ Utf8View(view), start, length, is_break, is_all_whitespace });
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},
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layout_mode, do_wrap_lines, do_wrap_breaks);
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for (size_t i = 0; i < chunks.size(); ++i) {
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auto& chunk = chunks[i];
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// Collapse entire fragment into non-existence if previous fragment on line ended in whitespace.
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if (do_collapse && line_boxes.last().is_empty_or_ends_in_whitespace() && chunk.is_all_whitespace)
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continue;
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float chunk_width;
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if (do_wrap_lines) {
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if (do_collapse && isspace(*chunk.view.begin()) && line_boxes.last().is_empty_or_ends_in_whitespace()) {
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// This is a non-empty chunk that starts with collapsible whitespace.
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// We are at either at the start of a new line, or after something that ended in whitespace,
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// so we don't need to contribute our own whitespace to the line. Skip over it instead!
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++chunk.start;
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--chunk.length;
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chunk.view = chunk.view.substring_view(1, chunk.view.byte_length() - 1);
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}
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chunk_width = font.width(chunk.view) + font.glyph_spacing();
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if (line_boxes.last().width() > 0 && chunk_width > available_width) {
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containing_block.add_line_box();
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available_width = context.available_width_at_line(line_boxes.size() - 1);
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if (do_collapse && chunk.is_all_whitespace)
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continue;
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}
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} else {
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chunk_width = font.width(chunk.view);
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}
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line_boxes.last().add_fragment(*this, chunk.start, chunk.length, chunk_width, font.glyph_height());
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available_width -= chunk_width;
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if (do_wrap_lines) {
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if (available_width < 0) {
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containing_block.add_line_box();
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available_width = context.available_width_at_line(line_boxes.size() - 1);
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}
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}
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if (do_wrap_breaks) {
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if (chunk.is_break) {
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containing_block.add_line_box();
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available_width = context.available_width_at_line(line_boxes.size() - 1);
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}
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}
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}
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}
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void TextNode::split_into_lines(InlineFormattingContext& context, LayoutMode layout_mode)
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{
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bool do_collapse = true;
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bool do_wrap_lines = true;
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bool do_wrap_breaks = false;
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if (computed_values().white_space() == CSS::WhiteSpace::Nowrap) {
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do_collapse = true;
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do_wrap_lines = false;
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do_wrap_breaks = false;
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} else if (computed_values().white_space() == CSS::WhiteSpace::Pre) {
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do_collapse = false;
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do_wrap_lines = false;
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do_wrap_breaks = true;
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} else if (computed_values().white_space() == CSS::WhiteSpace::PreLine) {
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do_collapse = true;
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do_wrap_lines = true;
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do_wrap_breaks = true;
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} else if (computed_values().white_space() == CSS::WhiteSpace::PreWrap) {
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do_collapse = false;
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do_wrap_lines = true;
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do_wrap_breaks = true;
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}
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split_into_lines_by_rules(context, layout_mode, do_collapse, do_wrap_lines, do_wrap_breaks);
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}
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}
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