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LibGUI: Add ScrollableContainerWidget :^)

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This widget provides a scrollable view onto another (child) widget.
If the child is larger than the parent, scrollbars are provided for
panning around the child.
This commit is contained in:
Andreas Kling 2021-05-05 22:15:09 +02:00
parent 89f5f92b7e
commit 18d344609f
3 changed files with 111 additions and 0 deletions
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74
Userland/Libraries/LibGUI/ScrollableContainerWidget.cpp Normal file
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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGUI/Layout.h>
#include <LibGUI/ScrollableContainerWidget.h>
namespace GUI {
ScrollableContainerWidget::ScrollableContainerWidget()
{
}
ScrollableContainerWidget::~ScrollableContainerWidget()
{
}
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(), -vertical_scrollbar().value());
}
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 = frame_inner_rect().size();
auto preferred_size = m_widget->layout()->preferred_size();
if (preferred_size.width() != -1)
new_size.set_width(preferred_size.width());
if (preferred_size.height() != -1)
new_size.set_height(preferred_size.height());
m_widget->resize(new_size);
set_content_size(new_size);
}
}
void ScrollableContainerWidget::resize_event(GUI::ResizeEvent& event)
{
AbstractScrollableWidget::resize_event(event);
update_widget_size();
}
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_size();
update_widget_position();
}
}