text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include "EraseTool.h"
  #include "ImageEditor.h"
  #include "Layer.h"
  #include <LibGUI/Action.h>
  #include <LibGUI/Menu.h>
  #include <LibGUI/Painter.h>
  #include <LibGfx/Bitmap.h>
  
  namespace PixelPaint {
  
  EraseTool::EraseTool()
  {
  }
  
  EraseTool::~EraseTool()
  {
  }
  
  Gfx::IntRect EraseTool::build_rect(Gfx::IntPoint const& pos, Gfx::IntRect const& widget_rect)
  {
      const int base_eraser_size = 10;
      const int eraser_size = (base_eraser_size * m_thickness);
      const int eraser_radius = eraser_size / 2;
      const auto ex = pos.x();
      const auto ey = pos.y();
      return Gfx::IntRect(ex - eraser_radius, ey - eraser_radius, eraser_size, eraser_size).intersected(widget_rect);
  }
  
  void EraseTool::on_mousedown(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
  {
      if (event.button() != GUI::MouseButton::Left && event.button() != GUI::MouseButton::Right)
          return;
      Gfx::IntRect r = build_rect(event.position(), layer.rect());
      GUI::Painter painter(layer.bitmap());
      painter.clear_rect(r, get_color());
      layer.did_modify_bitmap();
  }
  
  void EraseTool::on_mousemove(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
  {
      if (event.buttons() & GUI::MouseButton::Left || event.buttons() & GUI::MouseButton::Right) {
          Gfx::IntRect r = build_rect(event.position(), layer.rect());
          GUI::Painter painter(layer.bitmap());
          painter.clear_rect(r, get_color());
          layer.did_modify_bitmap();
      }
  }
  
  void EraseTool::on_mouseup(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
  {
      if (event.button() != GUI::MouseButton::Left && event.button() != GUI::MouseButton::Right)
          return;
      m_editor->did_complete_action();
  }
  
  void EraseTool::on_tool_button_contextmenu(GUI::ContextMenuEvent& event)
  {
      if (!m_context_menu) {
          m_context_menu = GUI::Menu::construct();
  
          auto eraser_color_toggler = GUI::Action::create_checkable("Use secondary color", [&](auto& action) {
              m_use_secondary_color = action.is_checked();
          });
          eraser_color_toggler->set_checked(m_use_secondary_color);
  
          m_context_menu->add_action(eraser_color_toggler);
          m_context_menu->add_separator();
  
          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());
  }
  
  Color EraseTool::get_color() const
  {
      if (m_use_secondary_color)
          return m_editor->secondary_color();
      return Color(255, 255, 255, 0);
  }
  
  }
  