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LibWeb: Add a very naive Layout::FlexFormattingContext :^)

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This is very dumb and only lays out its child boxes on a horizontal
line with their shrink-to-fit widths.

You have to start somewhere! :^)
This commit is contained in:
Andreas Kling 2021-01-18 17:33:46 +01:00
parent d18bc9ccd2
commit fd7920fa8f
4 changed files with 120 additions and 2 deletions
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62
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp Normal file
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/*
* Copyright (c) 2021, 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 <LibWeb/Layout/BlockBox.h>
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/FlexFormattingContext.h>
namespace Web::Layout {
FlexFormattingContext::FlexFormattingContext(Box& context_box, FormattingContext* parent)
: FormattingContext(context_box, parent)
{
}
FlexFormattingContext::~FlexFormattingContext()
{
}
void FlexFormattingContext::run(Box& box, LayoutMode layout_mode)
{
// FIXME: This is *extremely* naive and only supports flex items laid out on a single horizontal line.
// First, compute the width of each flex item.
box.for_each_child_of_type<Box>([&](Box& child_box) {
auto shrink_to_fit_result = calculate_shrink_to_fit_widths(child_box);
auto shrink_to_fit_width = min(max(shrink_to_fit_result.preferred_minimum_width, 0.0f), shrink_to_fit_result.preferred_width);
layout_inside(child_box, layout_mode);
child_box.set_width(shrink_to_fit_width);
});
// Then, place the items on a line.
float x = 0;
box.for_each_child_of_type<Box>([&](Box& child_box) {
child_box.set_offset(x, 0);
x += child_box.border_box_width();
});
}
}