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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Splitter.h>
#include <LibGUI/Window.h>
#include <LibGfx/Palette.h>
REGISTER_WIDGET(GUI, HorizontalSplitter)
REGISTER_WIDGET(GUI, VerticalSplitter)
namespace GUI {
Splitter::Splitter(Orientation orientation)
: m_orientation(orientation)
{
REGISTER_INT_PROPERTY("first_resizee_minimum_size", first_resizee_minimum_size, set_first_resizee_minimum_size);
REGISTER_INT_PROPERTY("second_resizee_minimum_size", second_resizee_minimum_size, set_second_resizee_minimum_size);
set_background_role(ColorRole::Button);
set_layout<BoxLayout>(orientation);
set_fill_with_background_color(true);
layout()->set_spacing(3);
}
Splitter::~Splitter()
{
}
void Splitter::paint_event(PaintEvent& event)
{
Painter painter(*this);
painter.add_clip_rect(event.rect());
auto palette = this->palette();
auto paint_knurl = [&](int x, int y) {
painter.set_pixel(x, y, palette.threed_shadow1());
painter.set_pixel(x + 1, y, palette.threed_shadow1());
painter.set_pixel(x, y + 1, palette.threed_shadow1());
painter.set_pixel(x + 1, y + 1, palette.threed_highlight());
};
constexpr size_t knurl_width = 2;
constexpr size_t knurl_spacing = 1;
constexpr size_t knurl_count = 10;
constexpr size_t total_knurling_width = knurl_count * (knurl_width + knurl_spacing);
if (m_hovered_index.has_value())
painter.fill_rect(m_grabbables[m_hovered_index.value()].paint_rect, palette.hover_highlight());
for (auto& grabbable : m_grabbables) {
for (size_t i = 0; i < knurl_count; ++i) {
auto& rect = grabbable.paint_rect;
int primary = rect.center().primary_offset_for_orientation(m_orientation) - 1;
int secondary = rect.center().secondary_offset_for_orientation(m_orientation) - (total_knurling_width / 2) + (i * (knurl_width + knurl_spacing));
if (m_orientation == Gfx::Orientation::Vertical)
paint_knurl(secondary, primary);
else
paint_knurl(primary, secondary);
}
}
}
void Splitter::resize_event(ResizeEvent& event)
{
Widget::resize_event(event);
set_hovered_grabbable(nullptr);
}
void Splitter::set_hovered_grabbable(Grabbable* grabbable)
{
if (m_hovered_index.has_value()) {
if (grabbable && grabbable->index == m_hovered_index.value())
return;
update(m_grabbables[m_hovered_index.value()].paint_rect);
}
if (grabbable) {
m_hovered_index = grabbable->index;
update(grabbable->paint_rect);
} else {
m_hovered_index = {};
}
}
void Splitter::override_cursor(bool do_override)
{
if (do_override) {
if (!m_overriding_cursor) {
set_override_cursor(m_orientation == Orientation::Horizontal ? Gfx::StandardCursor::ResizeColumn : Gfx::StandardCursor::ResizeRow);
m_overriding_cursor = true;
}
} else {
if (m_overriding_cursor) {
set_override_cursor(Gfx::StandardCursor::None);
m_overriding_cursor = false;
}
}
}
void Splitter::leave_event(Core::Event&)
{
if (!m_resizing)
override_cursor(false);
set_hovered_grabbable(nullptr);
}
Splitter::Grabbable* Splitter::grabbable_at(Gfx::IntPoint const& position)
{
for (auto& grabbable : m_grabbables) {
if (grabbable.grabbable_rect.contains(position))
return &grabbable;
}
return nullptr;
}
void Splitter::mousedown_event(MouseEvent& event)
{
if (event.button() != MouseButton::Left)
return;
auto* grabbable = grabbable_at(event.position());
if (!grabbable)
return;
m_resizing = true;
m_first_resizee = *grabbable->first_widget;
m_second_resizee = *grabbable->second_widget;
m_first_resizee_start_size = m_first_resizee->size();
m_second_resizee_start_size = m_second_resizee->size();
m_resize_origin = event.position();
}
Gfx::IntRect Splitter::rect_between_widgets(GUI::Widget const& first_widget, GUI::Widget const& second_widget, bool honor_content_margins) const
{
auto first_widget_rect = honor_content_margins ? first_widget.content_rect() : first_widget.relative_rect();
auto second_widget_rect = honor_content_margins ? second_widget.content_rect() : second_widget.relative_rect();
auto first_edge = first_widget_rect.last_edge_for_orientation(m_orientation);
auto second_edge = second_widget_rect.first_edge_for_orientation(m_orientation);
Gfx::IntRect rect;
rect.set_primary_offset_for_orientation(m_orientation, first_edge);
rect.set_primary_size_for_orientation(m_orientation, second_edge - first_edge);
rect.set_secondary_offset_for_orientation(m_orientation, 0);
rect.set_secondary_size_for_orientation(m_orientation, relative_rect().secondary_size_for_orientation(m_orientation));
return rect;
}
void Splitter::recompute_grabbables()
{
auto old_grabbables_count = m_grabbables.size();
m_grabbables.clear();
auto old_hovered_index = m_hovered_index;
m_hovered_index = {};
auto child_widgets = this->child_widgets();
child_widgets.remove_all_matching([&](auto& widget) { return !widget.is_visible(); });
if (child_widgets.size() < 2)
return;
size_t start_index = 0;
size_t end_index = 1;
while (end_index < child_widgets.size()) {
auto const& first_widget = child_widgets[start_index];
auto const& second_widget = child_widgets[end_index];
m_grabbables.append(Grabbable {
.index = m_grabbables.size(),
.grabbable_rect = rect_between_widgets(first_widget, second_widget, true),
.paint_rect = rect_between_widgets(first_widget, second_widget, false),
.first_widget = first_widget,
.second_widget = second_widget,
});
++start_index;
++end_index;
}
if (old_hovered_index.has_value() && old_grabbables_count == m_grabbables.size())
set_hovered_grabbable(&m_grabbables[old_hovered_index.value()]);
}
void Splitter::mousemove_event(MouseEvent& event)
{
auto* grabbable = grabbable_at(event.position());
set_hovered_grabbable(grabbable);
if (!m_resizing) {
override_cursor(grabbable != nullptr);
return;
}
auto delta = event.position() - m_resize_origin;
if (!m_first_resizee || !m_second_resizee) {
// One or both of the resizees were deleted during an ongoing resize, screw this.
m_resizing = false;
return;
}
auto new_first_resizee_size = m_first_resizee_start_size;
auto new_second_resizee_size = m_second_resizee_start_size;
new_first_resizee_size.set_primary_size_for_orientation(m_orientation, new_first_resizee_size.primary_size_for_orientation(m_orientation) + delta.primary_offset_for_orientation(m_orientation));
new_second_resizee_size.set_primary_size_for_orientation(m_orientation, new_second_resizee_size.primary_size_for_orientation(m_orientation) - delta.primary_offset_for_orientation(m_orientation));
if (new_first_resizee_size.primary_size_for_orientation(m_orientation) < m_first_resizee_minimum_size) {
int correction = m_first_resizee_minimum_size - new_first_resizee_size.primary_size_for_orientation(m_orientation);
new_first_resizee_size.set_primary_size_for_orientation(m_orientation, new_first_resizee_size.primary_size_for_orientation(m_orientation) + correction);
new_second_resizee_size.set_primary_size_for_orientation(m_orientation, new_second_resizee_size.primary_size_for_orientation(m_orientation) - correction);
}
if (new_second_resizee_size.primary_size_for_orientation(m_orientation) < m_second_resizee_minimum_size) {
int correction = m_second_resizee_minimum_size - new_second_resizee_size.primary_size_for_orientation(m_orientation);
new_second_resizee_size.set_primary_size_for_orientation(m_orientation, new_second_resizee_size.primary_size_for_orientation(m_orientation) + correction);
new_first_resizee_size.set_primary_size_for_orientation(m_orientation, new_first_resizee_size.primary_size_for_orientation(m_orientation) - correction);
}
if (m_orientation == Orientation::Horizontal) {
m_first_resizee->set_fixed_width(new_first_resizee_size.width());
m_second_resizee->set_fixed_width(-1);
} else {
m_first_resizee->set_fixed_height(new_first_resizee_size.height());
m_second_resizee->set_fixed_height(-1);
}
invalidate_layout();
}
void Splitter::did_layout()
{
recompute_grabbables();
}
void Splitter::mouseup_event(MouseEvent& event)
{
if (event.button() != MouseButton::Left)
return;
m_resizing = false;
m_first_resizee = nullptr;
m_second_resizee = nullptr;
if (!rect().contains(event.position()))
set_override_cursor(Gfx::StandardCursor::None);
}
}
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