ladybird/Applications/PixelPaint/MoveTool.cpp

/*
 * Copyright (c) 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 "MoveTool.h"
#include "Image.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Window.h>
#include <LibGfx/Bitmap.h>

namespace PixelPaint {

MoveTool::MoveTool()
{
}

MoveTool::~MoveTool()
{
}

void MoveTool::on_mousedown(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent& image_event)
{
    if (event.button() != GUI::MouseButton::Left)
        return;
    if (!layer.rect().contains(event.position()))
        return;
    m_layer_being_moved = layer;
    m_event_origin = image_event.position();
    m_layer_origin = layer.location();
    m_editor->window()->set_override_cursor(GUI::StandardCursor::Move);
}

void MoveTool::on_mousemove(Layer&, GUI::MouseEvent&, GUI::MouseEvent& image_event)
{
    if (!m_layer_being_moved)
        return;
    auto delta = image_event.position() - m_event_origin;
    m_layer_being_moved->set_location(m_layer_origin.translated(delta));
    m_editor->layers_did_change();
}

void MoveTool::on_mouseup(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (event.button() != GUI::MouseButton::Left)
        return;
    m_layer_being_moved = nullptr;
    m_editor->window()->set_override_cursor(GUI::StandardCursor::None);
}

void MoveTool::on_keydown(GUI::KeyEvent& event)
{
    if (event.modifiers() != 0)
        return;

    auto* layer = m_editor->active_layer();
    if (!layer)
        return;

    auto new_location = layer->location();

    switch (event.key()) {
    case Key_Up:
        new_location.move_by(0, -1);
        break;
    case Key_Down:
        new_location.move_by(0, 1);
        break;
    case Key_Left:
        new_location.move_by(-1, 0);
        break;
    case Key_Right:
        new_location.move_by(1, 0);
        break;
    default:
        return;
    }

    layer->set_location(new_location);
    m_editor->layers_did_change();
}

void MoveTool::on_context_menu(Layer& layer, GUI::ContextMenuEvent& event)
{
    if (!m_context_menu) {
        m_context_menu = GUI::Menu::construct();
        m_context_menu->add_action(GUI::CommonActions::make_move_to_front_action([this](auto&) {
            m_editor->image()->move_layer_to_front(*m_context_menu_layer);
            m_editor->layers_did_change();
        }, m_editor));
        m_context_menu->add_action(GUI::CommonActions::make_move_to_back_action([this](auto&) {
            m_editor->image()->move_layer_to_back(*m_context_menu_layer);
            m_editor->layers_did_change();
        }, m_editor));
        m_context_menu->add_separator();
        m_context_menu->add_action(GUI::Action::create("Delete layer", Gfx::Bitmap::load_from_file("/res/icons/16x16/delete.png"), [this](auto&) {
            m_editor->image()->remove_layer(*m_context_menu_layer);
            // FIXME: This should not be done imperatively here. Perhaps a Image::Client interface that ImageEditor can implement?
            if (m_editor->active_layer() == m_context_menu_layer)
                m_editor->set_active_layer(nullptr);
            m_editor->layers_did_change();
        }, m_editor));
    }
    m_context_menu_layer = layer;
    m_context_menu->popup(event.screen_position());
}

}