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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 <LibGUI/Frame.h>
#include <LibGUI/ScrollBar.h>
namespace GUI {
class ScrollableWidget : public Frame {
C_OBJECT(ScrollableWidget)
public:
virtual ~ScrollableWidget() override;
Gfx::IntSize content_size() const { return m_content_size; }
int content_width() const { return m_content_size.width(); }
int content_height() const { return m_content_size.height(); }
Gfx::IntRect visible_content_rect() const;
Gfx::IntRect widget_inner_rect() const;
Gfx::IntRect viewport_rect_in_content_coordinates() const
{
auto viewport_rect = visible_content_rect();
viewport_rect.set_size(widget_inner_rect().size());
return viewport_rect;
}
void scroll_into_view(const Gfx::IntRect&, Orientation);
void scroll_into_view(const Gfx::IntRect&, bool scroll_horizontally, bool scroll_vertically);
void set_scrollbars_enabled(bool);
bool is_scrollbars_enabled() const { return m_scrollbars_enabled; }
Gfx::IntSize available_size() const;
Gfx::IntSize excess_size() const;
ScrollBar& vertical_scrollbar() { return *m_vertical_scrollbar; }
const ScrollBar& vertical_scrollbar() const { return *m_vertical_scrollbar; }
ScrollBar& horizontal_scrollbar() { return *m_horizontal_scrollbar; }
const ScrollBar& horizontal_scrollbar() const { return *m_horizontal_scrollbar; }
Widget& corner_widget() { return *m_corner_widget; }
const Widget& corner_widget() const { return *m_corner_widget; }
void scroll_to_top();
void scroll_to_bottom();
int width_occupied_by_vertical_scrollbar() const;
int height_occupied_by_horizontal_scrollbar() const;
void set_should_hide_unnecessary_scrollbars(bool b) { m_should_hide_unnecessary_scrollbars = b; }
bool should_hide_unnecessary_scrollbars() const { return m_should_hide_unnecessary_scrollbars; }
Gfx::IntPoint to_content_position(const Gfx::IntPoint& widget_position) const;
Gfx::IntPoint to_widget_position(const Gfx::IntPoint& content_position) const;
Gfx::IntRect to_content_rect(const Gfx::IntRect& widget_rect) const { return { to_content_position(widget_rect.location()), widget_rect.size() }; }
Gfx::IntRect to_widget_rect(const Gfx::IntRect& content_rect) const { return { to_widget_position(content_rect.location()), content_rect.size() }; }
protected:
ScrollableWidget();
virtual void custom_layout() override;
virtual void resize_event(ResizeEvent&) override;
virtual void mousewheel_event(MouseEvent&) override;
virtual void did_scroll() { }
void set_content_size(const Gfx::IntSize&);
void set_size_occupied_by_fixed_elements(const Gfx::IntSize&);
private:
class ScrollableWidgetScrollBar final : public ScrollBar {
C_OBJECT(ScrollableWidgetScrollBar);
protected:
explicit ScrollableWidgetScrollBar(ScrollableWidget& owner, Gfx::Orientation orientation)
: ScrollBar(orientation)
, m_owner(owner)
{
}
virtual void mousewheel_event(MouseEvent& event) override
{
m_owner.handle_wheel_event(event, *this);
}
private:
ScrollableWidget& m_owner;
};
friend class ScrollableWidgetScrollBar;
void update_scrollbar_ranges();
void handle_wheel_event(MouseEvent&, Widget&);
RefPtr<ScrollableWidgetScrollBar> m_vertical_scrollbar;
RefPtr<ScrollableWidgetScrollBar> m_horizontal_scrollbar;
RefPtr<Widget> m_corner_widget;
Gfx::IntSize m_content_size;
Gfx::IntSize m_size_occupied_by_fixed_elements;
bool m_scrollbars_enabled { true };
bool m_should_hide_unnecessary_scrollbars { false };
};
}
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