touchscreengui.h

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/*
Copyright (C) 2014 sapier
Copyright (C) 2024 grorp, Gregor Parzefall
                <gregor.parzefall@posteo.de>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#pragma once
 
#include "IGUIStaticText.h"
#include "irrlichttypes.h"
#include <IEventReceiver.h>
#include <IGUIImage.h>
#include <IGUIEnvironment.h>
#include <IrrlichtDevice.h>
 
#include <memory>
#include <optional>
#include <unordered_map>
#include <vector>
 
#include "itemdef.h"
#include "client/game.h"
 
using namespace irr;
using namespace irr::core;
using namespace irr::gui;
 
 
// We cannot use irr_ptr for Irrlicht GUI elements we own.
// Option 1: Pass IGUIElement* returned by IGUIEnvironment::add* into irr_ptr
//           constructor.
//           -> We steal the reference owned by IGUIEnvironment and drop it later,
//           causing the IGUIElement to be deleted while IGUIEnvironment still
//           references it.
// Option 2: Pass IGUIElement* returned by IGUIEnvironment::add* into irr_ptr::grab.
//           -> We add another reference and drop it later, but since IGUIEnvironment
//           still references the IGUIElement, it is never deleted.
// To make IGUIEnvironment drop its reference to the IGUIElement, we have to call
// IGUIElement::remove, so that's what we'll do.
template <typename T>
std::shared_ptr<T> grab_gui_element(T *element)
{
        static_assert(std::is_base_of_v<IGUIElement, T>,
                        "grab_gui_element only works for IGUIElement");
        return std::shared_ptr<T>(element, [](T *e) {
                e->remove();
        });
}
std::shared_ptr<T> grab_gui_element(T *element) {…}
 
 
enum class TapState
{
        None,
        ShortTap,
        LongTap,
};
enum class TapState {…};
 
enum touch_gui_button_id
{
        jump_id = 0,
        sneak_id,
        zoom_id,
        aux1_id,
        overflow_id,
 
        // usually in the "settings bar"
        fly_id,
        noclip_id,
        fast_id,
        debug_id,
        camera_id,
        range_id,
        minimap_id,
        toggle_chat_id,
 
        // usually in the "rare controls bar"
        chat_id,
        inventory_id,
        drop_id,
        exit_id,
 
        // the joystick
        joystick_off_id,
        joystick_bg_id,
        joystick_center_id,
};
enum touch_gui_button_id {…};
 
 
#define BUTTON_REPEAT_DELAY 0.5f
#define BUTTON_REPEAT_INTERVAL 0.333f
 
// Our simulated clicks last some milliseconds so that server-side mods have a
// chance to detect them via l_get_player_control.
// If you tap faster than this value, the simulated clicks are of course shorter.
#define SIMULATED_CLICK_DURATION_MS 50
 
 
struct button_info
{
        float repeat_counter;
        EKEY_CODE keycode;
        std::vector<size_t> pointer_ids;
        std::shared_ptr<IGUIImage> gui_button = nullptr;
 
        enum {
                NOT_TOGGLEABLE,
                FIRST_TEXTURE,
                SECOND_TEXTURE
        } toggleable = NOT_TOGGLEABLE;
        std::string toggle_textures[2];
 
        void emitAction(bool action, video::IVideoDriver *driver,
                        IEventReceiver *receiver, ISimpleTextureSource *tsrc);
};
struct button_info {…};
 
 
class TouchScreenGUI
{
public:
        TouchScreenGUI(IrrlichtDevice *device, ISimpleTextureSource *tsrc);
 
        void translateEvent(const SEvent &event);
        void applyContextControls(const TouchInteractionMode &mode);
 
        double getYawChange()
        {
                double res = m_camera_yaw_change;
                m_camera_yaw_change = 0;
                return res;
        }
        double getYawChange() {…}
 
        double getPitchChange() {
                double res = m_camera_pitch_change;
                m_camera_pitch_change = 0;
                return res;
        }
        double getPitchChange() {…}
 
        line3d<f32> getShootline() { return m_shootline; }
 
        float getMovementDirection() { return m_joystick_direction; }
        float getMovementSpeed() { return m_joystick_speed; }
 
        void step(float dtime);
        inline void setUseCrosshair(bool use_crosshair) { m_draw_crosshair = use_crosshair; }
 
        void setVisible(bool visible);
        void hide();
        void show();
 
        void resetHotbarRects();
        void registerHotbarRect(u16 index, const recti &rect);
        std::optional<u16> getHotbarSelection();
 
private:
        IrrlichtDevice *m_device = nullptr;
        IGUIEnvironment *m_guienv = nullptr;
        IEventReceiver *m_receiver = nullptr;
        ISimpleTextureSource *m_texturesource = nullptr;
        v2u32 m_screensize;
        s32 m_button_size;
        double m_touchscreen_threshold;
        u16 m_long_tap_delay;
        bool m_visible = true; // is the whole touch screen gui visible
 
        std::unordered_map<u16, recti> m_hotbar_rects;
        std::optional<u16> m_hotbar_selection = std::nullopt;
 
        // value in degree
        double m_camera_yaw_change = 0.0;
        double m_camera_pitch_change = 0.0;
 
        line3d<f32> m_shootline;
 
        bool m_has_move_id = false;
        size_t m_move_id;
        bool m_move_has_really_moved = false;
        u64 m_move_downtime = 0;
        // m_move_pos stays valid even after m_move_id has been released.
        v2s32 m_move_pos;
        // This is needed so that we don't miss if m_has_move_id is true for less
        // than one client step, i.e. press and release happen in the same step.
        bool m_had_move_id = false;
        bool m_move_prevent_short_tap = false;
 
        bool m_has_joystick_id = false;
        size_t m_joystick_id;
        bool m_joystick_has_really_moved = false;
        float m_joystick_direction = 0.0f; // assume forward
        float m_joystick_speed = 0.0f; // no movement
        bool m_joystick_status_aux1 = false;
        bool m_fixed_joystick = false;
        bool m_joystick_triggers_aux1 = false;
        bool m_draw_crosshair = false;
        std::shared_ptr<IGUIImage> m_joystick_btn_off;
        std::shared_ptr<IGUIImage> m_joystick_btn_bg;
        std::shared_ptr<IGUIImage> m_joystick_btn_center;
 
        std::vector<button_info> m_buttons;
        std::shared_ptr<IGUIImage> m_overflow_btn;
 
        bool m_overflow_open = false;
        std::shared_ptr<IGUIStaticText> m_overflow_bg;
        std::vector<button_info> m_overflow_buttons;
        std::vector<std::shared_ptr<IGUIStaticText>> m_overflow_button_titles;
        std::vector<recti> m_overflow_button_rects;
 
        void toggleOverflowMenu();
        void updateVisibility();
        void releaseAll();
 
        // initialize a button
        void addButton(std::vector<button_info> &buttons,
                        touch_gui_button_id id, const std::string &image,
                        const recti &rect, bool visible=true);
        void addToggleButton(std::vector<button_info> &buttons,
                        touch_gui_button_id id,
                        const std::string &image_1, const std::string &image_2,
                        const recti &rect, bool visible=true);
 
        IGUIImage *makeButtonDirect(touch_gui_button_id id,
                        const recti &rect, bool visible);
 
        // handle pressing hotbar items
        bool isHotbarButton(const SEvent &event);
 
        // handle release event
        void handleReleaseEvent(size_t pointer_id);
 
        // apply joystick status
        void applyJoystickStatus();
 
        // map to store the IDs and original positions of currently pressed pointers
        std::unordered_map<size_t, v2s32> m_pointer_downpos;
        // map to store the IDs and positions of currently pressed pointers
        std::unordered_map<size_t, v2s32> m_pointer_pos;
 
        v2s32 getPointerPos();
        void emitMouseEvent(EMOUSE_INPUT_EVENT type);
        TouchInteractionMode m_last_mode = TouchInteractionMode_END;
        TapState m_tap_state = TapState::None;
 
        bool m_dig_pressed = false;
        u64 m_dig_pressed_until = 0;
 
        bool m_place_pressed = false;
        u64 m_place_pressed_until = 0;
};
class TouchScreenGUI {…};
 
extern TouchScreenGUI *g_touchscreengui;