kicad/include/tool/tool_menu.h

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017-2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef TOOLS_TOOL_MENU__H_
#define TOOLS_TOOL_MENU__H_

#include <tool/conditional_menu.h>
#include <tool/tool_event.h>

#include <vector>
#include <memory>

class ACTION_MENU;

/**
 * Manage a #CONDITIONAL_MENU and some number of CONTEXT_MENUs as sub-menus.
 *
 * Each "top-level" interactive tool can have one of these, and other tools can contribute
 * #CONTEXT_MENUS to it.  There are also helper functions for adding common sets of menu
 * items, for example zoom and grid controls.
 */
class TOOL_MENU
{
public:

    /**
     * Construct a new TOOL_MENU for a specific tool.
     *
     * This menu will be empty - it's up to the caller to add the relevant items. This can be
     * done directly, using the reference returned by TOOL_MENU::GetMenu(), or the helpers for
     * common command sets can be used, or a combination of the two.
     */
    TOOL_MENU( TOOL_INTERACTIVE& aTool );

    /**
     * Destruct any submenus created with TOOL_MENU::CreateSubMenu().
     */
    ~TOOL_MENU();

    /**
     * @return reference to the CONDITIONAL_MENU model, which can be used by tools to add
     *         their own commands to the menu.
     */
    CONDITIONAL_MENU& GetMenu();

    /**
     * Store a submenu of this menu model. This can be shared with other menu models.
     *
     * It is the callers responsibility to add the submenu to m_menu (via GetMenu() ) in the
     * right way, as well as to set the tool with SetTool(), since it's not a given that the
     * menu's tool is the tool that directly owns this #TOOL_MENU.
     *
     * @param aSubMenu: a sub menu to add
     */
    void AddSubMenu( std::shared_ptr<ACTION_MENU> aSubMenu );

    /**
     * @return the list of submenus from this menu
     */
    std::vector<std::shared_ptr<ACTION_MENU> >& GetSubMenus()
    {
        return m_subMenus;
    }

    /**
     * Helper function to set and immediately show a #CONDITIONAL_MENU in concert with the
     * given #SELECTION
     *
     * You don't have to use this function, if the caller has a different way to show the
     * menu, it can create one from the reference returned by TOOL_MENU::GetMenu(), but it
     * will have to be managed externally to this class.
     */
    void ShowContextMenu( SELECTION& aSelection );

    /**
     * Helper function to show a context menu without any selection for tools that can't
     * make selections.
     */
    void ShowContextMenu();

private:
    /**
     * The conditional menu displayed by the tool.
     */
    CONDITIONAL_MENU m_menu;

    /**
     * The tool that owns this menu.
     */
    TOOL_INTERACTIVE& m_tool;

    /**
     * Lifetime-managing container of submenus.
     */
    std::vector<std::shared_ptr<ACTION_MENU> > m_subMenus;
};

#endif    // TOOLS_TOOL_MENU__H_