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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Function.h>
#include <LibGUI/Widget.h>
namespace GUI {
class ScrollBar final : public Widget {
C_OBJECT(ScrollBar)
public:
virtual ~ScrollBar() override;
Gfx::Orientation orientation() const { return m_orientation; }
bool is_scrollable() const { return max() != min(); }
int value() const { return m_value; }
int min() const { return m_min; }
int max() const { return m_max; }
int page() const { return m_page; }
int step() const { return m_step; }
int big_step() const { return m_big_step; }
void set_min(int min) { set_range(min, max(), page()); }
void set_max(int max) { set_range(min(), max, page()); }
void set_page(int page) { set_range(min(), max(), page); }
void set_range(int min, int max) { set_range(min, max, page()); }
void set_range(int min, int max, int page);
void set_value(int value);
void set_step(int step) { m_step = step; }
void set_big_step(int big_step) { m_big_step = big_step; }
bool has_scrubber() const;
Function<void(int)> on_change;
enum Component {
None,
DecrementButton,
IncrementButton,
Gutter,
Scrubber,
};
private:
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;
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 decrement_gutter_rect() const;
Gfx::IntRect increment_gutter_rect() const;
Gfx::IntRect scrubber_rect() const;
int 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_min { 0 };
int m_max { 0 };
int m_page { 0 };
int m_value { 0 };
int m_step { 1 };
int m_big_step { 5 };
int m_scrub_start_value { 0 };
Gfx::IntPoint m_scrub_origin;
Gfx::Orientation m_orientation { Gfx::Orientation::Vertical };
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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