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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/JsonObject.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Widget.h>
#include <LibGfx/Orientation.h>
#include <stdio.h>
REGISTER_CORE_OBJECT(GUI, HorizontalBoxLayout)
REGISTER_CORE_OBJECT(GUI, VerticalBoxLayout)
namespace GUI {
BoxLayout::BoxLayout(Orientation orientation)
: m_orientation(orientation)
{
register_property(
"orientation", [this] { return m_orientation == Gfx::Orientation::Vertical ? "Vertical" : "Horizontal"; }, nullptr);
}
Gfx::IntSize BoxLayout::preferred_size() const
{
Gfx::IntSize size;
size.set_primary_size_for_orientation(orientation(), preferred_primary_size());
size.set_secondary_size_for_orientation(orientation(), preferred_secondary_size());
return size;
}
int BoxLayout::preferred_primary_size() const
{
int size = 0;
for (auto& entry : m_entries) {
if (!entry.widget || !entry.widget->is_visible())
continue;
int min_size = entry.widget->min_size().primary_size_for_orientation(orientation());
int max_size = entry.widget->max_size().primary_size_for_orientation(orientation());
int preferred_primary_size = -1;
if (entry.widget->is_shrink_to_fit() && entry.widget->layout()) {
preferred_primary_size = entry.widget->layout()->preferred_size().primary_size_for_orientation(orientation());
}
int item_size = max(0, preferred_primary_size);
item_size = max(min_size, item_size);
item_size = min(max_size, item_size);
size += item_size + spacing();
}
if (size > 0)
size -= spacing();
if (orientation() == Gfx::Orientation::Horizontal)
size += margins().left() + margins().right();
else
size += margins().top() + margins().bottom();
if (!size)
return -1;
return size;
}
int BoxLayout::preferred_secondary_size() const
{
int size = 0;
for (auto& entry : m_entries) {
if (!entry.widget || !entry.widget->is_visible())
continue;
int min_size = entry.widget->min_size().secondary_size_for_orientation(orientation());
int preferred_secondary_size = -1;
if (entry.widget->is_shrink_to_fit() && entry.widget->layout()) {
preferred_secondary_size = entry.widget->layout()->preferred_size().secondary_size_for_orientation(orientation());
size = max(size, preferred_secondary_size);
}
size = max(min_size, size);
}
if (orientation() == Gfx::Orientation::Horizontal)
size += margins().top() + margins().bottom();
else
size += margins().left() + margins().right();
if (!size)
return -1;
return size;
}
void BoxLayout::run(Widget& widget)
{
if (m_entries.is_empty())
return;
struct Item {
Widget* widget { nullptr };
int min_size { -1 };
int max_size { -1 };
int size { 0 };
bool final { false };
};
Vector<Item, 32> items;
for (size_t i = 0; i < m_entries.size(); ++i) {
auto& entry = m_entries[i];
if (entry.type == Entry::Type::Spacer) {
items.append(Item { nullptr, -1, -1 });
continue;
}
if (!entry.widget)
continue;
if (!entry.widget->is_visible())
continue;
auto min_size = entry.widget->min_size();
auto max_size = entry.widget->max_size();
if (entry.widget->is_shrink_to_fit() && entry.widget->layout()) {
auto preferred_size = entry.widget->layout()->preferred_size();
min_size = max_size = preferred_size;
}
items.append(Item { entry.widget.ptr(), min_size.primary_size_for_orientation(orientation()), max_size.primary_size_for_orientation(orientation()) });
}
if (items.is_empty())
return;
int available_size = widget.size().primary_size_for_orientation(orientation()) - spacing() * (items.size() - 1);
int unfinished_items = items.size();
if (orientation() == Gfx::Orientation::Horizontal)
available_size -= margins().left() + margins().right();
else
available_size -= margins().top() + margins().bottom();
// Pass 1: Set all items to their minimum size.
for (auto& item : items) {
item.size = 0;
if (item.min_size >= 0)
item.size = item.min_size;
available_size -= item.size;
if (item.min_size >= 0 && item.max_size >= 0 && item.min_size == item.max_size) {
// Fixed-size items finish immediately in the first pass.
item.final = true;
--unfinished_items;
}
}
// Pass 2: Distribute remaining available size evenly, respecting each item's maximum size.
while (unfinished_items && available_size > 0) {
int slice = available_size / unfinished_items;
// If available_size does not divide evenly by unfinished_items,
// there are some extra pixels that have to be distributed.
int pixels = available_size - slice * unfinished_items;
available_size = 0;
for (auto& item : items) {
if (item.final)
continue;
int pixel = pixels ? 1 : 0;
pixels -= pixel;
int item_size_with_full_slice = item.size + slice + pixel;
item.size = item_size_with_full_slice;
if (item.max_size >= 0)
item.size = min(item.max_size, item_size_with_full_slice);
// If the slice was more than we needed, return remained to available_size.
int remainder_to_give_back = item_size_with_full_slice - item.size;
available_size += remainder_to_give_back;
if (item.max_size >= 0 && item.size == item.max_size) {
// We've hit the item's max size. Don't give it any more space.
item.final = true;
--unfinished_items;
}
}
}
// Pass 3: Place the widgets.
int current_x = margins().left();
int current_y = margins().top();
auto widget_rect_with_margins_subtracted = widget.rect();
widget_rect_with_margins_subtracted.take_from_left(margins().left());
widget_rect_with_margins_subtracted.take_from_top(margins().top());
widget_rect_with_margins_subtracted.take_from_right(margins().right());
widget_rect_with_margins_subtracted.take_from_bottom(margins().bottom());
for (auto& item : items) {
Gfx::IntRect rect { current_x, current_y, 0, 0 };
rect.set_primary_size_for_orientation(orientation(), item.size);
if (item.widget) {
int secondary = widget.size().secondary_size_for_orientation(orientation());
if (orientation() == Gfx::Orientation::Horizontal)
secondary -= margins().top() + margins().bottom();
else
secondary -= margins().left() + margins().right();
int min_secondary = item.widget->min_size().secondary_size_for_orientation(orientation());
int max_secondary = item.widget->max_size().secondary_size_for_orientation(orientation());
if (min_secondary >= 0)
secondary = max(secondary, min_secondary);
if (max_secondary >= 0)
secondary = min(secondary, max_secondary);
rect.set_secondary_size_for_orientation(orientation(), secondary);
if (orientation() == Gfx::Orientation::Horizontal)
rect.center_vertically_within(widget_rect_with_margins_subtracted);
else
rect.center_horizontally_within(widget_rect_with_margins_subtracted);
item.widget->set_relative_rect(rect);
}
if (orientation() == Gfx::Orientation::Horizontal)
current_x += rect.width() + spacing();
else
current_y += rect.height() + spacing();
}
}
}
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