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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <LibGUI/AbstractSlider.h>
namespace GUI {
class Scrollbar : public AbstractSlider {
C_OBJECT(Scrollbar);
public:
virtual ~Scrollbar() override;
bool is_scrollable() const { return max() != min(); }
bool has_scrubber() const;
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,
} 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(const Gfx::IntPoint&);
void scroll_by_page(const Gfx::IntPoint&);
Component component_at_position(const Gfx::IntPoint&);
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;
};
}
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