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dab7ec190e
Implement, and use internally, content_margins() from Widget. Since AbstractScrollableWidget already has a method called content_size, the convenience method, with the same name, in Widget has to be explicitly called.
288 lines
11 KiB
C++
288 lines
11 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/Timer.h>
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#include <LibGUI/AbstractScrollableWidget.h>
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#include <LibGUI/Scrollbar.h>
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namespace GUI {
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AbstractScrollableWidget::AbstractScrollableWidget()
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{
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m_vertical_scrollbar = add<AbstractScrollableWidgetScrollbar>(*this, Orientation::Vertical);
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m_vertical_scrollbar->set_step(4);
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m_vertical_scrollbar->on_change = [this](int) {
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did_scroll();
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update();
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};
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m_horizontal_scrollbar = add<AbstractScrollableWidgetScrollbar>(*this, Orientation::Horizontal);
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m_horizontal_scrollbar->set_step(4);
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m_horizontal_scrollbar->set_page_step(30);
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m_horizontal_scrollbar->on_change = [this](int) {
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did_scroll();
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update();
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};
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m_corner_widget = add<Widget>();
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m_corner_widget->set_fill_with_background_color(true);
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m_automatic_scrolling_timer = add<Core::Timer>();
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m_automatic_scrolling_timer->set_interval(50);
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m_automatic_scrolling_timer->on_timeout = [this] {
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on_automatic_scrolling_timer_fired();
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};
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}
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AbstractScrollableWidget::~AbstractScrollableWidget()
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{
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}
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void AbstractScrollableWidget::handle_wheel_event(MouseEvent& event, Widget& event_source)
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{
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if (!m_scrollbars_enabled) {
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event.ignore();
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return;
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}
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// FIXME: The wheel delta multiplier should probably come from... somewhere?
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if (event.shift() || &event_source == m_horizontal_scrollbar.ptr()) {
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horizontal_scrollbar().set_value(horizontal_scrollbar().value() + event.wheel_delta() * 60);
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} else {
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vertical_scrollbar().set_value(vertical_scrollbar().value() + event.wheel_delta() * 20);
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}
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}
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void AbstractScrollableWidget::mousewheel_event(MouseEvent& event)
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{
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handle_wheel_event(event, *this);
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}
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void AbstractScrollableWidget::custom_layout()
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{
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auto inner_rect = frame_inner_rect_for_size(size());
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int height_wanted_by_horizontal_scrollbar = m_horizontal_scrollbar->is_visible() ? m_horizontal_scrollbar->min_height() : 0;
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int width_wanted_by_vertical_scrollbar = m_vertical_scrollbar->is_visible() ? m_vertical_scrollbar->min_width() : 0;
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m_vertical_scrollbar->set_relative_rect(
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inner_rect.right() + 1 - m_vertical_scrollbar->min_width(),
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inner_rect.top(),
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m_vertical_scrollbar->min_width(),
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inner_rect.height() - height_wanted_by_horizontal_scrollbar);
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m_horizontal_scrollbar->set_relative_rect(
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inner_rect.left(),
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inner_rect.bottom() + 1 - m_horizontal_scrollbar->min_height(),
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inner_rect.width() - width_wanted_by_vertical_scrollbar,
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m_horizontal_scrollbar->min_height());
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m_corner_widget->set_visible(m_vertical_scrollbar->is_visible() && m_horizontal_scrollbar->is_visible());
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if (m_corner_widget->is_visible()) {
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Gfx::IntRect corner_rect { m_horizontal_scrollbar->relative_rect().right() + 1, m_vertical_scrollbar->relative_rect().bottom() + 1, width_occupied_by_vertical_scrollbar(), height_occupied_by_horizontal_scrollbar() };
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m_corner_widget->set_relative_rect(corner_rect);
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}
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}
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void AbstractScrollableWidget::resize_event(ResizeEvent& event)
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{
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Frame::resize_event(event);
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update_scrollbar_ranges();
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}
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Gfx::IntSize AbstractScrollableWidget::available_size() const
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{
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auto inner_size = Widget::content_size();
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unsigned available_width = max(inner_size.width() - m_size_occupied_by_fixed_elements.width(), 0);
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unsigned available_height = max(inner_size.height() - m_size_occupied_by_fixed_elements.height(), 0);
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return { available_width, available_height };
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}
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Gfx::IntSize AbstractScrollableWidget::excess_size() const
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{
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auto available_size = this->available_size();
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int excess_height = max(0, m_content_size.height() - available_size.height());
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int excess_width = max(0, m_content_size.width() - available_size.width());
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return { excess_width, excess_height };
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}
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void AbstractScrollableWidget::update_scrollbar_ranges()
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{
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if (should_hide_unnecessary_scrollbars()) {
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if (excess_size().height() - height_occupied_by_horizontal_scrollbar() <= 0 && excess_size().width() - width_occupied_by_vertical_scrollbar() <= 0) {
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m_horizontal_scrollbar->set_visible(false);
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m_vertical_scrollbar->set_visible(false);
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} else {
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auto vertical_initial_visibility = m_vertical_scrollbar->is_visible();
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auto horizontal_initial_visibility = m_horizontal_scrollbar->is_visible();
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m_vertical_scrollbar->set_visible(excess_size().height() > 0);
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m_horizontal_scrollbar->set_visible(excess_size().width() > 0);
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if (m_vertical_scrollbar->is_visible() != vertical_initial_visibility)
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m_horizontal_scrollbar->set_visible(excess_size().width() > 0);
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if (m_horizontal_scrollbar->is_visible() != horizontal_initial_visibility)
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m_vertical_scrollbar->set_visible(excess_size().height() > 0);
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}
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}
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m_horizontal_scrollbar->set_range(0, excess_size().width());
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m_horizontal_scrollbar->set_page_step(visible_content_rect().width() - m_horizontal_scrollbar->step());
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m_vertical_scrollbar->set_range(0, excess_size().height());
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m_vertical_scrollbar->set_page_step(visible_content_rect().height() - m_vertical_scrollbar->step());
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}
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void AbstractScrollableWidget::set_content_size(const Gfx::IntSize& size)
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{
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if (m_content_size == size)
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return;
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m_content_size = size;
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update_scrollbar_ranges();
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}
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void AbstractScrollableWidget::set_size_occupied_by_fixed_elements(const Gfx::IntSize& size)
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{
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if (m_size_occupied_by_fixed_elements == size)
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return;
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m_size_occupied_by_fixed_elements = size;
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update_scrollbar_ranges();
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}
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int AbstractScrollableWidget::height_occupied_by_horizontal_scrollbar() const
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{
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return m_horizontal_scrollbar->is_visible() ? m_horizontal_scrollbar->height() : 0;
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}
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int AbstractScrollableWidget::width_occupied_by_vertical_scrollbar() const
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{
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return m_vertical_scrollbar->is_visible() ? m_vertical_scrollbar->width() : 0;
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}
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Margins AbstractScrollableWidget::content_margins() const
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{
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return Frame::content_margins() + Margins { 0, width_occupied_by_vertical_scrollbar(), height_occupied_by_horizontal_scrollbar(), 0 };
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}
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Gfx::IntRect AbstractScrollableWidget::visible_content_rect() const
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{
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auto inner_size = Widget::content_size();
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Gfx::IntRect rect {
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m_horizontal_scrollbar->value(),
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m_vertical_scrollbar->value(),
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min(m_content_size.width(), inner_size.width() - m_size_occupied_by_fixed_elements.width()),
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min(m_content_size.height(), inner_size.height() - m_size_occupied_by_fixed_elements.height())
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};
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if (rect.is_empty())
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return {};
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return rect;
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}
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void AbstractScrollableWidget::scroll_into_view(const Gfx::IntRect& rect, Orientation orientation)
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{
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if (orientation == Orientation::Vertical)
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return scroll_into_view(rect, false, true);
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return scroll_into_view(rect, true, false);
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}
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void AbstractScrollableWidget::scroll_into_view(const Gfx::IntRect& rect, bool scroll_horizontally, bool scroll_vertically)
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{
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auto visible_content_rect = this->visible_content_rect();
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if (visible_content_rect.contains(rect))
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return;
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if (scroll_vertically) {
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if (rect.top() < visible_content_rect.top()) {
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m_vertical_scrollbar->set_value(rect.top());
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} else if (rect.top() > visible_content_rect.top() && rect.bottom() > visible_content_rect.bottom()) {
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m_vertical_scrollbar->set_value(rect.bottom() - visible_content_rect.height() + 1);
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}
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}
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if (scroll_horizontally) {
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if (rect.left() < visible_content_rect.left()) {
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m_horizontal_scrollbar->set_value(rect.left());
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} else if (rect.left() > visible_content_rect.left() && rect.right() > visible_content_rect.right()) {
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m_horizontal_scrollbar->set_value(rect.right() - visible_content_rect.width() + 1);
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}
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}
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}
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void AbstractScrollableWidget::set_scrollbars_enabled(bool scrollbars_enabled)
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{
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if (m_scrollbars_enabled == scrollbars_enabled)
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return;
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m_scrollbars_enabled = scrollbars_enabled;
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m_vertical_scrollbar->set_visible(m_scrollbars_enabled);
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m_horizontal_scrollbar->set_visible(m_scrollbars_enabled);
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m_corner_widget->set_visible(m_scrollbars_enabled);
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}
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void AbstractScrollableWidget::scroll_to_top()
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{
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scroll_into_view({}, Orientation::Vertical);
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}
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void AbstractScrollableWidget::scroll_to_bottom()
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{
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scroll_into_view({ 0, content_height(), 0, 0 }, Orientation::Vertical);
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}
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void AbstractScrollableWidget::set_automatic_scrolling_timer(bool active)
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{
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if (active == m_active_scrolling_enabled)
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return;
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m_active_scrolling_enabled = active;
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if (active) {
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on_automatic_scrolling_timer_fired();
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m_automatic_scrolling_timer->start();
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} else {
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m_automatic_scrolling_timer->stop();
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}
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}
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Gfx::IntPoint AbstractScrollableWidget::automatic_scroll_delta_from_position(const Gfx::IntPoint& pos) const
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{
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Gfx::IntPoint delta { 0, 0 };
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if (pos.y() < m_autoscroll_threshold)
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delta.set_y(clamp(-(m_autoscroll_threshold - pos.y()), -m_autoscroll_threshold, 0));
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else if (pos.y() > widget_inner_rect().height() - m_autoscroll_threshold)
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delta.set_y(clamp(m_autoscroll_threshold - (widget_inner_rect().height() - pos.y()), 0, m_autoscroll_threshold));
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if (pos.x() < m_autoscroll_threshold)
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delta.set_x(clamp(-(m_autoscroll_threshold - pos.x()), -m_autoscroll_threshold, 0));
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else if (pos.x() > widget_inner_rect().width() - m_autoscroll_threshold)
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delta.set_x(clamp(m_autoscroll_threshold - (widget_inner_rect().width() - pos.x()), 0, m_autoscroll_threshold));
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return delta;
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}
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Gfx::IntRect AbstractScrollableWidget::widget_inner_rect() const
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{
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auto rect = frame_inner_rect();
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rect.set_width(rect.width() - width_occupied_by_vertical_scrollbar());
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rect.set_height(rect.height() - height_occupied_by_horizontal_scrollbar());
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return rect;
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}
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Gfx::IntPoint AbstractScrollableWidget::to_content_position(const Gfx::IntPoint& widget_position) const
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{
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auto content_position = widget_position;
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content_position.translate_by(horizontal_scrollbar().value(), vertical_scrollbar().value());
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content_position.translate_by(-frame_thickness(), -frame_thickness());
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return content_position;
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}
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Gfx::IntPoint AbstractScrollableWidget::to_widget_position(const Gfx::IntPoint& content_position) const
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{
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auto widget_position = content_position;
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widget_position.translate_by(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
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widget_position.translate_by(frame_thickness(), frame_thickness());
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return widget_position;
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}
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}
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