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LibGUI: Add a simple GSplitter container widget.

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This allows you to put multiple widgets in a container and makes the space
in between them draggable to resize the two adjacent widgets.
This commit is contained in:
Andreas Kling 2019-03-30 13:53:30 +01:00
parent f242d6e559
commit 9538c06a45
6 changed files with 127 additions and 4 deletions
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99
LibGUI/GSplitter.cpp Normal file
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#include <LibGUI/GSplitter.h>
#include <LibGUI/GBoxLayout.h>
GSplitter::GSplitter(Orientation orientation, GWidget* parent)
: GFrame(parent)
, m_orientation(orientation)
{
set_layout(make<GBoxLayout>(orientation));
set_fill_with_background_color(true);
set_background_color(Color::LightGray);
layout()->set_spacing(4);
}
GSplitter::~GSplitter()
{
}
void GSplitter::mousedown_event(GMouseEvent& event)
{
if (event.button() != GMouseButton::Left)
return;
m_resizing = true;
int x_or_y = m_orientation == Orientation::Horizontal ? event.x() : event.y();
GWidget* first_resizee { nullptr };
GWidget* second_resizee { nullptr };
int fudge = layout()->spacing();
for (auto* child : children()) {
if (!child->is_widget())
continue;
auto& child_widget = *static_cast<GWidget*>(child);
int child_start = m_orientation == Orientation::Horizontal ? child_widget.relative_rect().left() : child_widget.relative_rect().top();
int child_end = m_orientation == Orientation::Horizontal ? child_widget.relative_rect().right() : child_widget.relative_rect().bottom();
if (x_or_y > child_end && (x_or_y - fudge) <= child_end)
first_resizee = &child_widget;
if (x_or_y < child_start && (x_or_y + fudge) >= child_start)
second_resizee = &child_widget;
}
ASSERT(first_resizee && second_resizee);
m_first_resizee = first_resizee->make_weak_ptr();
m_second_resizee = second_resizee->make_weak_ptr();
m_first_resizee_start_size = first_resizee->size();
m_second_resizee_start_size = second_resizee->size();
m_resize_origin = event.position();
}
void GSplitter::mousemove_event(GMouseEvent& event)
{
if (!m_resizing)
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;
if (m_orientation == Orientation::Horizontal) {
new_first_resizee_size.set_width(new_first_resizee_size.width() + delta.x());
new_second_resizee_size.set_width(new_second_resizee_size.width() - delta.x());
if (new_first_resizee_size.width() < minimum_size) {
int correction = minimum_size - new_first_resizee_size.width();
new_first_resizee_size.set_width(new_first_resizee_size.width() + correction);
new_second_resizee_size.set_width(new_second_resizee_size.width() - correction);
}
if (new_second_resizee_size.width() < minimum_size) {
int correction = minimum_size - new_second_resizee_size.width();
new_second_resizee_size.set_width(new_second_resizee_size.width() + correction);
new_first_resizee_size.set_width(new_first_resizee_size.width() - correction);
}
} else {
new_first_resizee_size.set_height(new_first_resizee_size.height() + delta.y());
new_second_resizee_size.set_height(new_second_resizee_size.height() - delta.y());
if (new_first_resizee_size.height() < minimum_size) {
int correction = minimum_size - new_first_resizee_size.height();
new_first_resizee_size.set_height(new_first_resizee_size.height() + correction);
new_second_resizee_size.set_height(new_second_resizee_size.height() - correction);
}
if (new_second_resizee_size.height() < minimum_size) {
int correction = minimum_size - new_second_resizee_size.height();
new_second_resizee_size.set_height(new_second_resizee_size.height() + correction);
new_first_resizee_size.set_height(new_first_resizee_size.height() - correction);
}
}
m_first_resizee->set_preferred_size(new_first_resizee_size);
m_second_resizee->set_preferred_size(new_second_resizee_size);
invalidate_layout();
}
void GSplitter::mouseup_event(GMouseEvent& event)
{
if (event.button() != GMouseButton::Left)
return;
m_resizing = false;
}