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 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2021 Felix Ernst <fe.a.ernst@gmail.com>
 
     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #ifndef KHamburgerMenu_H
 #define KHamburgerMenu_H
 
 #include <kconfigwidgets_export.h>
 
 #include <QWidgetAction>
 
 #include <memory>
 
 class KHamburgerMenuPrivate;
 
 class QMenuBar;
 
 /**
  * @class KHamburgerMenu khamburgermenu.h KHamburgerMenu
  *
  * @short A menu that substitutes a menu bar when necessary
  *
  * Allowing users to toggle the visibility of the menu bar and/or toolbars,
  * while pretty/"simple by default", can lead to various grave usability issues.
  * This class makes it easy to prevent all of them.
  *
  * Simply add a KHamburgerMenu to your UI (typically to a QToolBar) and make
  * it aware of a QMenuBar like this:
  *
  * \code
  * auto hamburgerMenu = KStandardAction::hamburgerMenu(nullptr, nullptr, actionCollection());
  * toolBar()->addAction(hamburgerMenu);
  * hamburgerMenu->hideActionsOf(toolBar());
  * // after the QMenuBar has been initialised
  * hamburgerMenu->setMenuBar(menuBar()); // line not needed if there is no QMenuBar
  * \endcode
  *
  * The added menu button will only be visible when the QMenuBar is hidden.
  * With this minimal initialisation it will contain the contents of the menu bar.
  * If a user (also) hides the container the KHamburgerMenu was added to they
  * might find themselves without a way to get a menu back. To prevent this, it is
  * recommended to add the hamburgerMenu to prominent context menus like the one
  * of your central widget preferably at the first position. Simply write:
  *
  * \code
  * hamburgerMenu->addActionToMenu(contextMenu);
  * \endcode
  *
  * The added menu will only be visible if the QMenuBar is hidden and the
  * hamburgerMenu->createdWidgets() are all invisible to the user.
  *
  * **Populating the KHamburgerMenu**
  *
  * This is easy:
  *
  * \code
  * auto menu = new QMenu(this);
  * menu->addAction(action);
  * // Add actions, separators, etc. like usual.
  * hamburgerMenu->setMenu(menu);
  * \endcode
  *
  * You probably do not want this to happen on startup. Therefore KHamburgerMenu
  * provides the signal aboutToShowMenu that you can connect to a function containing
  * the previous statements.
  *
  * \code
  * connect(hamburgerMenu, &KHamburgerMenu::aboutToShowMenu,
  *         this, &MainWindow::updateHamburgerMenu);
  * // You might want to disconnect the signal after initial creation if the contents never change.
  * \endcode
  *
  * **Deciding what to put on the hamburger menu**
  *
  * 1. Be sure to add all of the most important actions. Actions which are already
  *    visible on QToolBars, etc. will not show up in the hamburgerMenu. To manage
  *    which containers KHamburgerMenu should watch for redundancy use
  *    hideActionsOf(QWidget *) and showActionsOf(QWidget *).
  *    When a KHamburgerMenu is added to a widget, hideActionsOf(that widget)
  *    will automatically be called.
  * 2. Do not worry about adding all actions the application has to offer.
  *    The KHamburgerMenu will automatically have a section advertising excluded
  *    actions which can be found in the QMenuBar. There will also be the
  *    showMenuBarAction if you set it with setShowMenuBarAction().
  * 3. Do not worry about the help menu. KHamburgerMenu will automatically contain
  *    a help menu as the second to last item (if you set a QMenuBar which is
  *    expected to have the help menu as the last action).
  *
  * **Open menu by shortcut**
  *
  * For visually impaired users it is important to have a consistent way to open a general-purpose
  * menu. Triggering the keyboard shortcut bound to KHamburgerMenu will always open a menu.
  * - If setMenuBar() was called and that menu bar is visible, the shortcut will open the first menu
  *   of that menu bar.
  * - Otherwise, if there is a visible KHamburgerMenu button in the user interface, that menu will
  *   open.
  * - Otherwise, KHamburgerMenu's menu will open at the mouse cursor position.
  *
  * @since 5.81
  */
 class KCONFIGWIDGETS_EXPORT KHamburgerMenu : public QWidgetAction
 {
     Q_OBJECT
     Q_DECLARE_PRIVATE(KHamburgerMenu)
 
 public:
     explicit KHamburgerMenu(QObject *parent);
 
     ~KHamburgerMenu() override;
 
     /**
      * Associates this KHamburgerMenu with @p menuBar. The KHamburgerMenu will from now
      * on only be visible when @p menuBar is hidden.
      * (Menu bars with QMenuBar::isNativeMenuBar() == true are considered hidden.)
      *
      * Furthermore the KHamburgerMenu will have the help menu from the @p menuBar added
      * at the end. There will also be a special sub-menu advertising actions which are
      * only available in the menu bar unless advertiseMenuBar(false) was called.
      *
      * @param menuBar   The QMenuBar the KHamburgerMenu should be associated with.
      *                  This can be set to nullptr.
      */
     void setMenuBar(QMenuBar *menuBar);
 
     /** @see setMenuBar() */
     QMenuBar *menuBar() const;
 
     /**
      * By default the KHamburgerMenu contains a special sub-menu that advertises actions
      * of the menu bar which would otherwise not be visible or discoverable for the user.
      * This method removes or re-adds that sub-menu.
      *
      * @param advertise sets whether the special sub-menu that advertises menu bar only
      *                  actions should exist.
      */
     void setMenuBarAdvertised(bool advertise);
 
     /** @see setMenuBarAdvertised() */
     bool menuBarAdvertised() const;
 
     /**
      * Adds the @p showMenuBarAction as the first item of the sub-menu which advertises actions
      * from the menu bar.
      * @see setMenuBarAdvertised()
      */
     void setShowMenuBarAction(QAction *showMenuBarAction);
 
     /**
      * Adds this KHamburgerMenu to @p menu.
      * It will only be visible in the menu if both the menu bar and all of this
      * QWidgetAction's createdWidgets() are invisible.
      * If it is visible in the menu, then opening the menu emits the aboutToShowMenu
      * signal.
      *
      * @param menu The menu this KHamburgerMenu is supposed to appear in.
      */
     void addToMenu(QMenu *menu);
 
     /**
      * Inserts this KHamburgerMenu to @p menu's list of actions, before the action @p before.
      * It will only be visible in the menu if both the menu bar and all of this
      * QWidgetAction's createdWidgets() are invisible.
      * If it is visible in the menu, then opening the menu emits the aboutToShowMenu
      * signal.
      *
      * @param before The action before which KHamburgerMenu should be inserted.
      * @param menu The menu this KHamburgerMenu is supposed to appear in.
      *
      * @see QWidget::insertAction(), QMenu::insertMenu()
      *
      * @since 5.99
      */
     void insertIntoMenuBefore(QMenu *menu, QAction *before);
 
     /**
      * Adds @p widget to a list of widgets that should be monitored for their actions().
      * If the widget is a QMenu, its actions will be treated as known to the user.
      * If the widget isn't a QMenu, its actions will only be treated as known to the user
      * when the widget is actually visible.
      * @param widget A widget that contains actions which should not show up in the
      *               KHamburgerMenu redundantly.
      */
     void hideActionsOf(QWidget *widget);
 
     /**
      * Reverses a hideActionsOf(widget) method call.
      * @see hideActionsOf()
      */
     void showActionsOf(QWidget *widget);
 
 Q_SIGNALS:
     /**
      * This signal is emitted when a hamburger menu button is about to be pressed down.
      * It is also emitted when a QMenu that contains a visible KHamburgerMenu emits
      * QMenu::aboutToShow.
      */
     void aboutToShowMenu();
 
 protected:
     /**
      * @see QWidgetAction::createWidget
      */
     virtual QWidget *createWidget(QWidget *parent) override;
 
 private:
     std::unique_ptr<KHamburgerMenuPrivate> const d_ptr;
 };
 
 #endif // KHamburgerMenu_H