text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #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_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 };
          m_editor->did_complete_action();
      }
  }
  
  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_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_fixed_height(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_fixed_size(80, 20);
  
          auto& thickness_slider = thickness_container.add<GUI::HorizontalSlider>();
          thickness_slider.set_fixed_height(20);
          thickness_slider.set_range(1, 20);
          thickness_slider.set_value(m_thickness);
          thickness_slider.on_change = [this](int value) {
              m_thickness = value;
          };
      }
  
      return m_properties_widget.ptr();
  }
  
  }
  