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/*
* Copyright (c) 2018-2020, 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)
{
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());
painter.fill_rect(m_grabbable_rect, palette().hover_highlight());
}
void Splitter::resize_event(ResizeEvent& event)
{
Widget::resize_event(event);
m_grabbable_rect = {};
}
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);
if (!m_grabbable_rect.is_empty()) {
m_grabbable_rect = {};
update();
}
}
bool Splitter::get_resize_candidates_at(const Gfx::IntPoint& position, Widget*& first, Widget*& second)
{
int x_or_y = position.primary_offset_for_orientation(m_orientation);
Widget* previous_widget = nullptr;
bool found_candidates = false;
for_each_child_widget([&](auto& child_widget) {
if (!child_widget.is_visible()) {
// We need to skip over widgets that are not visible as they
// are not necessarily in the correct location (anymore)
return IterationDecision::Continue;
}
if (!previous_widget) {
previous_widget = &child_widget;
return IterationDecision::Continue;
}
if (x_or_y > previous_widget->content_rect().last_edge_for_orientation(m_orientation)
&& x_or_y <= child_widget.content_rect().first_edge_for_orientation(m_orientation)) {
first = previous_widget;
second = &child_widget;
found_candidates = true;
return IterationDecision::Break;
}
previous_widget = &child_widget;
return IterationDecision::Continue;
});
return found_candidates;
}
void Splitter::mousedown_event(MouseEvent& event)
{
if (event.button() != MouseButton::Left)
return;
m_resizing = true;
Widget* first { nullptr };
Widget* second { nullptr };
if (!get_resize_candidates_at(event.position(), first, second))
return;
m_first_resizee = *first;
m_second_resizee = *second;
m_first_resizee_start_size = first->size();
m_second_resizee_start_size = second->size();
m_resize_origin = event.position();
}
void Splitter::recompute_grabbable_rect(const Widget& first, const Widget& second)
{
auto first_edge = first.content_rect().primary_offset_for_orientation(m_orientation) + first.content_rect().primary_size_for_orientation(m_orientation);
auto second_edge = second.content_rect().primary_offset_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, first.content_rect().secondary_offset_for_orientation(m_orientation));
rect.set_secondary_size_for_orientation(m_orientation, first.content_rect().secondary_size_for_orientation(m_orientation));
if (m_grabbable_rect != rect) {
m_grabbable_rect = rect;
update();
}
}
void Splitter::mousemove_event(MouseEvent& event)
{
if (!m_resizing) {
Widget* first { nullptr };
Widget* second { nullptr };
if (!get_resize_candidates_at(event.position(), first, second)) {
override_cursor(false);
return;
}
recompute_grabbable_rect(*first, *second);
override_cursor(m_grabbable_rect.contains(event.position()));
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;
}
int minimum_size = 0;
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) < minimum_size) {
int correction = 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) < minimum_size) {
int correction = 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()
{
if (m_first_resizee && m_second_resizee)
recompute_grabbable_rect(*m_first_resizee, *m_second_resizee);
}
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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