modalMenu.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include "irrlichttypes_extrabloated.h"
#include "irr_ptr.h"
#include "util/string.h"
#ifdef __ANDROID__
        #include <porting_android.h>
#endif
 
struct PointerAction {
        v2s32 pos;
        u64 time; // ms
 
        static PointerAction fromEvent(const SEvent &event);
        bool isRelated(PointerAction other);
};
 
class GUIModalMenu;
 
class IMenuManager
{
public:
        // A GUIModalMenu calls these when this class is passed as a parameter
        virtual void createdMenu(gui::IGUIElement *menu) = 0;
        virtual void deletingMenu(gui::IGUIElement *menu) = 0;
};
 
// Remember to drop() the menu after creating, so that it can
// remove itself when it wants to.
 
class GUIModalMenu : public gui::IGUIElement
{
public:
        GUIModalMenu(gui::IGUIEnvironment* env, gui::IGUIElement* parent, s32 id,
                IMenuManager *menumgr, bool remap_dbl_click = true);
        virtual ~GUIModalMenu();
 
        void allowFocusRemoval(bool allow);
        bool canTakeFocus(gui::IGUIElement *e);
        void draw();
        void quitMenu();
 
        virtual void regenerateGui(v2u32 screensize) = 0;
        virtual void drawMenu() = 0;
        virtual bool preprocessEvent(const SEvent &event);
        virtual bool OnEvent(const SEvent &event) { return false; };
        virtual bool pausesGame() { return false; } // Used for pause menu
#ifdef __ANDROID__
        virtual void getAndroidUIInput() {};
        porting::AndroidDialogState getAndroidUIInputState();
#endif
 
protected:
        virtual std::wstring getLabelByID(s32 id) = 0;
        virtual std::string getNameByID(s32 id) = 0;
 
        // Stores the last known pointer position.
        // If the last input event was a mouse event, it's the cursor position.
        // If the last input event was a touch event, it's the finger position.
        v2s32 m_pointer;
        v2s32 m_old_pointer;  // Mouse position after previous mouse event
 
        v2u32 m_screensize_old;
        float m_gui_scale;
#ifdef __ANDROID__
        std::string m_jni_field_name;
#endif
 
        struct ScalingInfo {
                f32 scale;
                core::rect<s32> rect;
        };
        ScalingInfo getScalingInfo(v2u32 screensize, v2u32 base_size);
 
        // This is set to true if the menu is currently processing a second-touch event.
        bool m_second_touch = false;
 
private:
        IMenuManager *m_menumgr;
        /* If true, remap a click outside the formspec to ESC. This is so that, for
         * example, touchscreen users can close formspecs.
         * The default for this setting is true. Currently, it's set to false for
         * the mainmenu to prevent Minetest from closing unexpectedly.
         */
        bool m_remap_click_outside;
        bool remapClickOutside(const SEvent &event);
        PointerAction m_last_click_outside{};
 
        // This might be necessary to expose to the implementation if it
        // wants to launch other menus
        bool m_allow_focus_removal = false;
 
        // Stuff related to touchscreen input
 
        irr_ptr<gui::IGUIElement> m_touch_hovered;
 
        // Converts touches into clicks.
        bool simulateMouseEvent(ETOUCH_INPUT_EVENT touch_event, bool second_try=false);
        void enter(gui::IGUIElement *element);
        void leave();
 
        // Used to detect double-taps and convert them into double-click events.
        PointerAction m_last_touch{};
};