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https://github.com/RGBCube/serenity
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LibGUI: Add a simple GSplitter container widget.
This allows you to put multiple widgets in a container and makes the space in between them draggable to resize the two adjacent widgets.
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6 changed files with 127 additions and 4 deletions
99
LibGUI/GSplitter.cpp
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99
LibGUI/GSplitter.cpp
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#include <LibGUI/GSplitter.h>
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#include <LibGUI/GBoxLayout.h>
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GSplitter::GSplitter(Orientation orientation, GWidget* parent)
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: GFrame(parent)
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, m_orientation(orientation)
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{
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set_layout(make<GBoxLayout>(orientation));
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set_fill_with_background_color(true);
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set_background_color(Color::LightGray);
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layout()->set_spacing(4);
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}
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GSplitter::~GSplitter()
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{
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}
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void GSplitter::mousedown_event(GMouseEvent& event)
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{
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if (event.button() != GMouseButton::Left)
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return;
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m_resizing = true;
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int x_or_y = m_orientation == Orientation::Horizontal ? event.x() : event.y();
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GWidget* first_resizee { nullptr };
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GWidget* second_resizee { nullptr };
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int fudge = layout()->spacing();
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for (auto* child : children()) {
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if (!child->is_widget())
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continue;
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auto& child_widget = *static_cast<GWidget*>(child);
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int child_start = m_orientation == Orientation::Horizontal ? child_widget.relative_rect().left() : child_widget.relative_rect().top();
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int child_end = m_orientation == Orientation::Horizontal ? child_widget.relative_rect().right() : child_widget.relative_rect().bottom();
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if (x_or_y > child_end && (x_or_y - fudge) <= child_end)
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first_resizee = &child_widget;
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if (x_or_y < child_start && (x_or_y + fudge) >= child_start)
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second_resizee = &child_widget;
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}
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ASSERT(first_resizee && second_resizee);
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m_first_resizee = first_resizee->make_weak_ptr();
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m_second_resizee = second_resizee->make_weak_ptr();
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m_first_resizee_start_size = first_resizee->size();
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m_second_resizee_start_size = second_resizee->size();
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m_resize_origin = event.position();
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}
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void GSplitter::mousemove_event(GMouseEvent& event)
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{
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if (!m_resizing)
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return;
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auto delta = event.position() - m_resize_origin;
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if (!m_first_resizee || !m_second_resizee) {
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// One or both of the resizees were deleted during an ongoing resize, screw this.
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m_resizing = false;
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return;;
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}
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int minimum_size = 0;
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auto new_first_resizee_size = m_first_resizee_start_size;
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auto new_second_resizee_size = m_second_resizee_start_size;
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if (m_orientation == Orientation::Horizontal) {
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new_first_resizee_size.set_width(new_first_resizee_size.width() + delta.x());
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new_second_resizee_size.set_width(new_second_resizee_size.width() - delta.x());
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if (new_first_resizee_size.width() < minimum_size) {
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int correction = minimum_size - new_first_resizee_size.width();
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new_first_resizee_size.set_width(new_first_resizee_size.width() + correction);
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new_second_resizee_size.set_width(new_second_resizee_size.width() - correction);
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}
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if (new_second_resizee_size.width() < minimum_size) {
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int correction = minimum_size - new_second_resizee_size.width();
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new_second_resizee_size.set_width(new_second_resizee_size.width() + correction);
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new_first_resizee_size.set_width(new_first_resizee_size.width() - correction);
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}
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} else {
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new_first_resizee_size.set_height(new_first_resizee_size.height() + delta.y());
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new_second_resizee_size.set_height(new_second_resizee_size.height() - delta.y());
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if (new_first_resizee_size.height() < minimum_size) {
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int correction = minimum_size - new_first_resizee_size.height();
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new_first_resizee_size.set_height(new_first_resizee_size.height() + correction);
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new_second_resizee_size.set_height(new_second_resizee_size.height() - correction);
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}
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if (new_second_resizee_size.height() < minimum_size) {
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int correction = minimum_size - new_second_resizee_size.height();
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new_second_resizee_size.set_height(new_second_resizee_size.height() + correction);
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new_first_resizee_size.set_height(new_first_resizee_size.height() - correction);
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}
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}
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m_first_resizee->set_preferred_size(new_first_resizee_size);
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m_second_resizee->set_preferred_size(new_second_resizee_size);
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invalidate_layout();
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}
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void GSplitter::mouseup_event(GMouseEvent& event)
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{
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if (event.button() != GMouseButton::Left)
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return;
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m_resizing = false;
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}
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