ladybird/Applications/PixelPaint/PenTool.cpp

/*
 * 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.
 */

#include "PenTool.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Label.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Slider.h>

namespace PixelPaint {

PenTool::PenTool()
{
}

PenTool::~PenTool()
{
}

void PenTool::on_mousedown(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (event.button() != GUI::MouseButton::Left && event.button() != GUI::MouseButton::Right)
        return;

    GUI::Painter painter(layer.bitmap());
    painter.draw_line(event.position(), event.position(), m_editor->color_for(event), m_thickness);
    layer.did_modify_bitmap(*m_editor->image());
    m_last_drawing_event_position = event.position();
}

void PenTool::on_mouseup(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (event.button() == GUI::MouseButton::Left || event.button() == GUI::MouseButton::Right)
        m_last_drawing_event_position = { -1, -1 };
}

void PenTool::on_mousemove(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (!(event.buttons() & GUI::MouseButton::Left || event.buttons() & GUI::MouseButton::Right))
        return;
    GUI::Painter painter(layer.bitmap());

    if (m_last_drawing_event_position != Gfx::IntPoint(-1, -1))
        painter.draw_line(m_last_drawing_event_position, event.position(), m_editor->color_for(event), m_thickness);
    else
        painter.draw_line(event.position(), event.position(), m_editor->color_for(event), m_thickness);
    layer.did_modify_bitmap(*m_editor->image());

    m_last_drawing_event_position = event.position();
}

void PenTool::on_tool_button_contextmenu(GUI::ContextMenuEvent& event)
{
    if (!m_context_menu) {
        m_context_menu = GUI::Menu::construct();
        m_thickness_actions.set_exclusive(true);
        auto insert_action = [&](int size, bool checked = false) {
            auto action = GUI::Action::create_checkable(String::number(size), [this, size](auto&) {
                m_thickness = size;
            });
            action->set_checked(checked);
            m_thickness_actions.add_action(*action);
            m_context_menu->add_action(move(action));
        };
        insert_action(1, true);
        insert_action(2);
        insert_action(3);
        insert_action(4);
    }
    m_context_menu->popup(event.screen_position());
}

GUI::Widget* PenTool::get_properties_widget()
{
    if (!m_properties_widget) {
        m_properties_widget = GUI::Widget::construct();
        m_properties_widget->set_layout<GUI::VerticalBoxLayout>();

        auto& thickness_container = m_properties_widget->add<GUI::Widget>();
        thickness_container.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
        thickness_container.set_preferred_size(0, 20);
        thickness_container.set_layout<GUI::HorizontalBoxLayout>();

        auto& thickness_label = thickness_container.add<GUI::Label>("Thickness:");
        thickness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
        thickness_label.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
        thickness_label.set_preferred_size(80, 20);

        auto& thickness_slider = thickness_container.add<GUI::HorizontalSlider>();
        thickness_slider.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
        thickness_slider.set_preferred_size(0, 20);
        thickness_slider.set_range(1, 20);
        thickness_slider.set_value(m_thickness);
        thickness_slider.on_value_changed = [this](int value) {
            m_thickness = value;
        };
    }

    return m_properties_widget.ptr();
}

}