VRTableMenuBase.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_PLATFORM_META_QUEST_APPLICATION_VR_TABLE_MENU_BASE_H
#define META_OCEAN_PLATFORM_META_QUEST_APPLICATION_VR_TABLE_MENU_BASE_H
 
#include "ocean/platform/meta/quest/application/Application.h"
 
#include "ocean/math/HomogenousMatrix4.h"
#include "ocean/math/RGBAColor.h"
 
#include "ocean/rendering/Engine.h"
#include "ocean/rendering/Framebuffer.h"
#include "ocean/rendering/Scene.h"
#include "ocean/rendering/Text.h"
#include "ocean/rendering/Transform.h"
 
namespace Ocean
{
 
namespace Platform
{
 
namespace Meta
{
 
namespace Quest
{
 
namespace Application
{
 
/**
 * The class implements the base class for a simple table-based menu for VR application.
 * The menu is composed of sections and menu entries.<br>
 * Based on controller tracking, the menu entries can be selected.<br>
 * Use the derived classes OpenXR::VRTableMenu or VrApi::VRTableMenu.
 * @ingroup platformmetaquestapplication
 */
class OCEAN_PLATFORM_META_QUEST_APPLICATION_EXPORT VRTableMenuBase
{
    public:
 
        /**
         * This class holds the information of a user-defined menu entry.
         */
        class Entry
        {
            friend class VRTableMenuBase;
 
            public:
 
                /**
                 * Creates a new entry.
                 * @param name The name of the entry (the text of the entry), must be valid
                 * @param url The url of the entry which is necessary to identify the individual entries
                 * @param color Optional color of the entry
                 */
                inline Entry(std::string name, std::string url, const RGBAColor& color = RGBAColor(false));
 
            protected:
 
                /// The name of the entry.
                std::string name_;
 
                /// The url of the entry.
                std::string url_;
 
                /// The optional color.
                RGBAColor color_;
        };
 
        /**
         * Definition of a vector holding entries.
         */
        using Entries = std::vector<Entry>;
 
        /**
         * Definition of a pair combining a group section name and menu entries.
         */
        using Group = std::pair<std::string, Entries>;
 
        /**
         * Definition of a vector holding groups.
         */
        using Groups = std::vector<Group>;
 
    protected:
 
        /**
         * This class contains the information necessary for one menu entry.
         */
        class MenuEntry
        {
            public:
 
                /**
                 * Creates an new menu entry object.
                 * @param engine The rendering engine to be used
                 * @param textLineHeight The height of the text line, in meter, with range (0, infinity)
                 * @param name The text of the menu entry, must be valid
                 * @param url The optional URL connected with the menu entry
                 * @param isEntry True, if the entry is a menu entry; False, if the entry is a name of a group section
                 * @param color The color of an entry
                 */
                MenuEntry(Rendering::Engine& engine, const Scalar textLineHeight, const std::string& name, const std::string& url, bool isEntry, const RGBAColor& color = RGBAColor(0.0f, 0.0f, 0.0f, 0.0f));
 
                /**
                 * Returns the extent of the actual text.
                 * @return The text's actual extent, in meter, with range [0, infinity)x[0, infinity)
                 */
                inline Vector2 extent() const;
 
                /**
                 * Returns the Transform node containing the Text node.
                 * @return The Transform node
                 */
                inline const Rendering::TransformRef& transform() const;
 
                /**
                 * Returns the name of this entry.
                 * @return The entry's name
                 */
                inline const std::string& name() const;
 
                /**
                 * Returns the optional URL of this entry.
                 * @return The entry's optional URL
                 */
                inline const std::string& url() const;
 
                /**
                 * Returns whether the entry is an actual menu entry of a group section.
                 * @return True, if the entry is a menu entry; False, if the entry is a name of a group section
                 */
                inline bool isEntry() const;
 
            protected:
 
                /// The Text node rendering the text.
                Rendering::TextRef text_;
 
                /// The Transform node containing the Text node.
                Rendering::TransformRef transform_;
 
                /// The name of the menu entry.
                std::string name_;
 
                /// The optional URL of the menu entry.
                std::string url_;
 
                /// True, if the entry is a menu entry; False, if the entry is a name of a group section
                bool isEntry_ = false;
        };
 
        /**
         * Definition of a vector holding menu entries.
         */
        using MenuEntries = std::vector<MenuEntry>;
 
    public:
 
        /**
         * Destructs a menu.
         */
        virtual ~VRTableMenuBase();
 
        /**
         * Sets all menu items.
         * @param group The menu group containing all menu entries to set
         * @param menuBackgroundColor The background color of a menu
         * @param entryBackgroundColor The background color of individual entries
         * @param entryHeight The height of each menu entry, in meter, with range (0, infinity)
         * @param minWidth The minimal width of the menu, in meter, with range [0, infinity)
         * @param minHeight The minimal height of the menu, in meter, with range [0, infinity)
         * @return True, if succeeded
         */
        inline bool setMenuEntries(const Group& group, const RGBAColor& menuBackgroundColor = RGBAColor(1.0f, 1.0f, 1.0f), const RGBAColor& entryBackgroundColor = RGBAColor(0.0f, 0.0f, 0.0f, 0.0f), const Scalar entryHeight = Scalar(0.04), const Scalar minWidth = Scalar(1), const Scalar minHeight = Scalar(0.5));
 
        /**
         * Sets all menu items.
         * @param groups The menu groups containing all menu entries to set
         * @param menuBackgroundColor The background color of menu
         * @param entryBackgroundColor The background color of individual entries
         * @param entryHeight The height of each menu entry, in meter, with range (0, infinity)
         * @param minWidth The minimal width of the menu, in meter, with range [0, infinity)
         * @param minHeight The minimal height of the menu, in meter, with range [0, infinity)
         * @return True, if succeeded
         */
        bool setMenuEntries(const Groups& groups, const RGBAColor& menuBackgroundColor = RGBAColor(1.0f, 1.0f, 1.0f), const RGBAColor& entryBackgroundColor = RGBAColor(0.0f, 0.0f, 0.0f, 0.0f), const Scalar entryHeight = Scalar(0.04), const Scalar minWidth = Scalar(1), const Scalar minHeight = Scalar(0.5));
 
        /**
         * Shows the menu at a specified location.
         * @param base_T_menu The transformation between menu and world, or menu and device (if 'world_T_device' is defined), must be valid
         * @param world_T_device The optional transformation between device and world, an invalid transformation to treat `base` as `world`
         * @return True, if the menu was shown; False, if e.g., the menu is empty
         */
        bool show(const HomogenousMatrix4& base_T_menu, const HomogenousMatrix4& world_T_device = HomogenousMatrix4(false));
 
        /**
         * Hides the menu.
         */
        void hide();
 
        /**
         * Returns whether the menu is shown.
         * @return True, if succeeded
         */
        inline bool isShown() const;
 
        /**
         * Returns the position of the menu
         * @return The position of the menu in the coordinate system that was selected as base
         * @sa show()
         */
        inline HomogenousMatrix4 base_T_menu() const;
 
        /**
         * Explicitly resets the entire menu without releasing any resources.
         * @sa setMenuEntries()
         */
        void reset();
 
        /**
         * Explicitly releases the menu and all associated resources.
         */
        void release();
 
        /**
         * Returns whether this menu is valid (whether it has been initialized with a engine and framebuffer).
         * @return True, if so
         */
        inline bool isValid() const;
 
        /**
         * Move operator.
         * @param menu The menu object to be moved
         * @return Reference to this object
         */
        VRTableMenuBase& operator=(VRTableMenuBase&& menu) = default;
 
    protected:
 
        /**
         * Creates a new invalid menu object.
         */
        VRTableMenuBase() = default;
 
        /**
         * Default move constructor.
         */
        VRTableMenuBase(VRTableMenuBase&&) = default;
 
        /**
         * Creates a new valid menu object.
         * @param engine The rendering engine which will be used to render the menu, must be valid
         * @param framebuffer The framebuffer associated with the rendering engine to which the menu will be rendered
         */
        VRTableMenuBase(const Rendering::EngineRef& engine, const Rendering::FramebufferRef& framebuffer);
 
        /**
         * Disabled copy constructor.
         */
        VRTableMenuBase(const VRTableMenuBase&) = delete;
 
        /**
         * Disabled copy operator.
         * @return The reference to this object
         */
        VRTableMenuBase& operator=(const VRTableMenuBase&) = delete;
 
    protected:
 
        /// The rendering engine.
        Rendering::EngineRef engine_;
 
        /// The framebuffer in which the menu will be rendered.
        Rendering::FramebufferRef framebuffer_;
 
        /// The scene holding the group and highlight elements.
        Rendering::SceneRef scene_;
 
        /// The group holding the menu.
        Rendering::GroupRef menuGroup_;
 
        /// The transformation for the selection pointer.
        Rendering::TransformRef transformSelectionPointer_;
 
        /// The transformation for the selection entry (the entry highlighting).
        Rendering::TransformRef transformSelectionEntry_;
 
        /// The width of the menu, in meter, with range (0, infinity)
        Scalar menuWidth_ = 0;
 
        /// The height of the menu, in meter, with range (0, infinity)
        Scalar menuHeight_ = 0;
 
        /// The height of each menu entry, in meter, with range (0, infinity)
        Scalar entryHeight_ = Scalar(0.04);
 
        /// The menu entries.
        MenuEntries menuEntries_;
 
        /// The transformation between the menu and a base coordinate system.
        HomogenousMatrix4 base_T_menu_ = HomogenousMatrix4(false);
 
        /// The transformation between menu and world (the center of the menu).
        HomogenousMatrix4 world_T_menu_ = HomogenousMatrix4(false);
 
        /// The names of the menu entries which is currently focused with the left and right controller, first left, second right.
        std::string focusedEntryNames_[2];
 
        /// The border around the menu entries.
        static constexpr Scalar menuBorder_ = Scalar(0.05);
 
        /// The offset in z-direction between background and menu entries in meter.
        static constexpr Scalar entryOffsetZ_ = Scalar(0.001);
};
 
inline VRTableMenuBase::Entry::Entry(std::string name, std::string url, const RGBAColor& color) :
    name_(std::move(name)),
    url_(std::move(url)),
    color_(color)
{
    // nothing to do here
}
 
Vector2 VRTableMenuBase::MenuEntry::extent() const
{
    ocean_assert(text_);
 
    return text_->size();
}
 
const Rendering::TransformRef& VRTableMenuBase::MenuEntry::transform() const
{
    return transform_;
}
 
inline const std::string& VRTableMenuBase::MenuEntry::name() const
{
    return name_;
}
 
inline const std::string& VRTableMenuBase::MenuEntry::url() const
{
    return url_;
}
 
inline bool VRTableMenuBase::MenuEntry::isEntry() const
{
    return isEntry_;
}
 
inline bool VRTableMenuBase::setMenuEntries(const Group& group, const RGBAColor& menuBackgroundColor, const RGBAColor& entryBackgroundColor, const Scalar entryHeight, const Scalar minWidth, const Scalar minHeight)
{
    const Groups groups(1, group);
 
    return setMenuEntries(groups, menuBackgroundColor, entryBackgroundColor, entryHeight, minWidth, minHeight);
}
 
inline bool VRTableMenuBase::isShown() const
{
    return world_T_menu_.isValid() && !scene_.isNull() && scene_->visible();
}
 
inline HomogenousMatrix4 VRTableMenuBase::base_T_menu() const
{
    return base_T_menu_;
}
 
inline bool VRTableMenuBase::isValid() const
{
    return engine_ && framebuffer_;
}
 
}
 
}
 
}
 
}
 
}
 
#endif // META_OCEAN_PLATFORM_META_QUEST_APPLICATION_VR_TABLE_MENU_BASE_H