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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/RefPtr.h>
#include <LibGUI/Layout.h>
#include <LibGUI/ScrollableContainerWidget.h>
REGISTER_WIDGET(GUI, ScrollableContainerWidget)
namespace GUI {
ScrollableContainerWidget::ScrollableContainerWidget()
{
REGISTER_BOOL_PROPERTY("scrollbars_enabled", is_scrollbars_enabled, set_scrollbars_enabled);
REGISTER_BOOL_PROPERTY("should_hide_unnecessary_scrollbars", should_hide_unnecessary_scrollbars, set_should_hide_unnecessary_scrollbars);
}
void ScrollableContainerWidget::did_scroll()
{
AbstractScrollableWidget::did_scroll();
update_widget_position();
}
void ScrollableContainerWidget::update_widget_position()
{
if (!m_widget)
return;
m_widget->move_to(-horizontal_scrollbar().value() + content_margins().left(), -vertical_scrollbar().value() + content_margins().top());
}
void ScrollableContainerWidget::update_widget_size()
{
if (!m_widget)
return;
m_widget->do_layout();
if (m_widget->is_shrink_to_fit() && m_widget->layout()) {
auto new_size = Widget::content_size();
auto preferred_size = m_widget->effective_preferred_size();
if (preferred_size.width().is_int())
new_size.set_width(preferred_size.width().as_int());
if (preferred_size.height().is_int())
new_size.set_height(preferred_size.height().as_int());
m_widget->resize(new_size);
set_content_size(new_size);
} else {
auto inner_size = Widget::content_size();
auto min_size = m_widget->effective_min_size();
auto new_size = Gfx::Size {
max(inner_size.width(), MUST(min_size.width().shrink_value())),
max(inner_size.height(), MUST(min_size.height().shrink_value()))
};
m_widget->resize(new_size);
set_content_size(new_size);
}
}
void ScrollableContainerWidget::update_widget_min_size()
{
if (!m_widget)
set_min_content_size({});
else
set_min_content_size(Gfx::IntSize(m_widget->effective_min_size().replace_component_if_matching_with(SpecialDimension::Shrink, UISize { 0, 0 })));
}
void ScrollableContainerWidget::resize_event(GUI::ResizeEvent& event)
{
AbstractScrollableWidget::resize_event(event);
update_widget_size();
update_widget_position();
}
void ScrollableContainerWidget::layout_relevant_change_occurred()
{
update_widget_min_size();
update_scrollbar_visibility();
update_scrollbar_ranges();
update_widget_size();
update_widget_position();
update();
}
void ScrollableContainerWidget::set_widget(GUI::Widget* widget)
{
if (m_widget == widget)
return;
if (m_widget)
remove_child(*m_widget);
m_widget = widget;
if (m_widget) {
add_child(*m_widget);
m_widget->move_to_back();
}
update_widget_min_size();
update_widget_size();
update_widget_position();
}
ErrorOr<void> ScrollableContainerWidget::load_from_gml_ast(NonnullRefPtr<GUI::GML::Node> ast, UnregisteredChildHandler unregistered_child_handler)
{
if (is<GUI::GML::GMLFile>(ast.ptr()))
return load_from_gml_ast(static_ptr_cast<GUI::GML::GMLFile>(ast)->main_class(), unregistered_child_handler);
VERIFY(is<GUI::GML::Object>(ast.ptr()));
auto object = static_ptr_cast<GUI::GML::Object>(ast);
object->for_each_property([&](auto key, auto value) {
set_property(key, value);
});
auto content_widget_value = object->get_property("content_widget"sv);
if (!content_widget_value.is_null() && !is<GUI::GML::Object>(content_widget_value.ptr())) {
return Error::from_string_literal("ScrollableContainerWidget content_widget is not an object");
}
auto has_children = false;
object->for_each_child_object([&](auto) { has_children = true; });
if (has_children) {
return Error::from_string_literal("Children specified for ScrollableContainerWidget, but only 1 widget as content_widget is supported");
}
if (!content_widget_value.is_null() && is<GUI::GML::Object>(content_widget_value.ptr())) {
auto content_widget = static_ptr_cast<GUI::GML::Object>(content_widget_value);
auto class_name = content_widget->name();
RefPtr<Core::Object> child;
if (auto* registration = Core::ObjectClassRegistration::find(class_name)) {
child = TRY(registration->construct());
} else {
child = TRY(unregistered_child_handler(class_name));
}
if (!child)
return Error::from_string_literal("Unable to construct a Widget class for ScrollableContainerWidget content_widget property");
auto widget_ptr = verify_cast<GUI::Widget>(child.ptr());
set_widget(widget_ptr);
TRY(static_ptr_cast<Widget>(child)->load_from_gml_ast(content_widget.release_nonnull(), unregistered_child_handler));
}
return {};
}
}
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