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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <LibCore/Timer.h>
#include <LibGUI/AbstractSlider.h>
namespace GUI {
class Scrollbar : public AbstractSlider {
C_OBJECT(Scrollbar);
public:
virtual ~Scrollbar() override = default;
bool is_scrollable() const { return max() != min(); }
bool has_scrubber() const;
enum class Animation {
SmoothScroll,
CoarseScroll
};
void set_scroll_animation(Animation scroll_animation);
virtual void set_value(int, AllowCallback = AllowCallback::Yes, DoClamp = DoClamp::Yes) override;
void set_target_value(int);
virtual void increase_slider_by(int delta) override { set_target_value(m_target_value + delta); }
virtual void decrease_slider_by(int delta) override { set_target_value(m_target_value - delta); }
virtual void increase_slider_by_page_steps(int page_steps) override { set_target_value(m_target_value + page_step() * page_steps); }
virtual void decrease_slider_by_page_steps(int page_steps) override { set_target_value(m_target_value - page_step() * page_steps); }
virtual void increase_slider_by_steps(int steps) override { set_target_value(m_target_value + step() * steps); }
virtual void decrease_slider_by_steps(int steps) override { set_target_value(m_target_value - step() * steps); }
virtual Optional<UISize> calculated_min_size() const override;
virtual Optional<UISize> calculated_preferred_size() const override;
enum Component {
None,
DecrementButton,
IncrementButton,
Gutter,
Scrubber,
};
protected:
explicit Scrollbar(Gfx::Orientation = Gfx::Orientation::Vertical);
virtual void paint_event(PaintEvent&) override;
virtual void mousedown_event(MouseEvent&) override;
virtual void mouseup_event(MouseEvent&) override;
virtual void mousemove_event(MouseEvent&) override;
virtual void mousewheel_event(MouseEvent&) override;
virtual void leave_event(Core::Event&) override;
virtual void change_event(Event&) override;
private:
enum class GutterClickState {
NotPressed,
BeforeScrubber,
AfterScrubber,
} m_gutter_click_state { GutterClickState::NotPressed };
int default_button_size() const { return 16; }
int button_size() const { return length(orientation()) <= (default_button_size() * 2) ? length(orientation()) / 2 : default_button_size(); }
int button_width() const { return orientation() == Orientation::Vertical ? width() : button_size(); }
int button_height() const { return orientation() == Orientation::Horizontal ? height() : button_size(); }
Gfx::IntRect decrement_button_rect() const;
Gfx::IntRect increment_button_rect() const;
Gfx::IntRect scrubber_rect() const;
float unclamped_scrubber_size() const;
int visible_scrubber_size() const;
int scrubbable_range_in_pixels() const;
void on_automatic_scrolling_timer_fired();
void set_automatic_scrolling_active(bool, Component);
void scroll_to_position(Gfx::IntPoint const&);
void scroll_by_page(Gfx::IntPoint const&);
Component component_at_position(Gfx::IntPoint const&);
void update_animated_scroll();
Animation m_scroll_animation { Animation::SmoothScroll };
int m_target_value { 0 };
int m_start_value { 0 };
double m_animation_time_elapsed { 0 };
int m_scrub_start_value { 0 };
Gfx::IntPoint m_scrub_origin;
Component m_hovered_component { Component::None };
Component m_pressed_component { Component::None };
Gfx::IntPoint m_last_mouse_position;
RefPtr<Core::Timer> m_automatic_scrolling_timer;
RefPtr<Core::Timer> m_animated_scrolling_timer;
};
}
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