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LibGUI: Have GUI::Splitter track all grabbable areas

Browse source 
Instead of computing the grabbable areas on the fly in mouse event
handlers, we now figure out which parts of the splitter are grabbable
when something moves around, and then remember it.

This makes the code a lot easier to follow.
This commit is contained in:
Andreas Kling 2021-05-26 21:59:10 +02:00
parent 25468fdcf7
commit 89272e810a
2 changed files with 100 additions and 64 deletions
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137
Userland/Libraries/LibGUI/Splitter.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -35,13 +35,27 @@ void Splitter::paint_event(PaintEvent& event)
{
Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(m_grabbable_rect, palette().hover_highlight());
auto palette = this->palette();
if (m_hovered_index.has_value())
painter.fill_rect(m_grabbables[m_hovered_index.value()].paint_rect, palette.hover_highlight());
}
void Splitter::resize_event(ResizeEvent& event)
{
Widget::resize_event(event);
m_grabbable_rect = {};
set_hovered_grabbable(nullptr);
}
void Splitter::set_hovered_grabbable(Grabbable* grabbable)
{
if (m_hovered_index.has_value() && grabbable && grabbable->index == m_hovered_index.value())
return;
if (grabbable)
m_hovered_index = grabbable->index;
else
m_hovered_index = {};
update();
}
void Splitter::override_cursor(bool do_override)
@ -63,87 +77,91 @@ void Splitter::leave_event(Core::Event&)
{
if (!m_resizing)
override_cursor(false);
if (!m_grabbable_rect.is_empty()) {
m_grabbable_rect = {};
update();
}
set_hovered_grabbable(nullptr);
}
bool Splitter::get_resize_candidates_at(const Gfx::IntPoint& position, Widget*& first, Widget*& second)
Splitter::Grabbable* Splitter::grabbable_at(Gfx::IntPoint const& position)
{
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;
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;
m_resizing = true;
Widget* first { nullptr };
Widget* second { nullptr };
if (!get_resize_candidates_at(event.position(), first, second))
auto* grabbable = grabbable_at(event.position());
if (!grabbable)
return;
m_first_resizee = *first;
m_second_resizee = *second;
m_first_resizee_start_size = first->size();
m_second_resizee_start_size = second->size();
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();
}
void Splitter::recompute_grabbable_rect(const Widget& first, const Widget& second)
Gfx::IntRect Splitter::rect_between_widgets(GUI::Widget const& first_widget, GUI::Widget const& second_widget, bool honor_content_margins) const
{
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);
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, 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));
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;
}
if (m_grabbable_rect != rect) {
m_grabbable_rect = rect;
update();
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) {
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()));
override_cursor(grabbable != nullptr);
return;
}
auto delta = event.position() - m_resize_origin;
@ -182,8 +200,7 @@ void Splitter::mousemove_event(MouseEvent& event)
void Splitter::did_layout()
{
if (m_first_resizee && m_second_resizee)
recompute_grabbable_rect(*m_first_resizee, *m_second_resizee);
recompute_grabbables();
}
void Splitter::mouseup_event(MouseEvent& event)