text: /*************************************************************************/
  /*  android_input_handler.cpp                                            */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
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  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "android_input_handler.h"
  
  #include "android_keys_utils.h"
  
  #include "core/os/os.h"
  
  void AndroidInputHandler::process_joy_event(const JoypadEvent &p_event) {
  	switch (p_event.type) {
  		case JOY_EVENT_BUTTON:
  			input->joy_button(p_event.device, p_event.index, p_event.pressed);
  			break;
  		case JOY_EVENT_AXIS:
  			input->joy_axis(p_event.device, p_event.index, p_event.value);
  			break;
  		case JOY_EVENT_HAT:
  			input->joy_hat(p_event.device, p_event.hat);
  			break;
  		default:
  			return;
  	}
  }
  
  void AndroidInputHandler::_set_key_modifier_state(Ref<InputEventWithModifiers> ev) const {
  	ev->set_shift(shift_mem);
  	ev->set_alt(alt_mem);
  	ev->set_metakey(meta_mem);
  	ev->set_control(control_mem);
  }
  
  void AndroidInputHandler::process_event(Ref<InputEvent> &p_event) {
  	input->parse_input_event(p_event);
  }
  
  void AndroidInputHandler::process_key_event(int p_keycode, int p_scancode, int p_unicode_char, bool p_pressed) {
  	Ref<InputEventKey> ev;
  	ev.instance();
  	int val = p_unicode_char;
  	unsigned int scancode = android_get_keysym(p_keycode);
  	unsigned int phy_scancode = android_get_keysym(p_scancode);
  
  	switch (scancode) {
  		case KEY_SHIFT: {
  			shift_mem = p_pressed;
  		} break;
  		case KEY_ALT: {
  			alt_mem = p_pressed;
  		} break;
  		case KEY_CONTROL: {
  			control_mem = p_pressed;
  		} break;
  		case KEY_META: {
  			meta_mem = p_pressed;
  		} break;
  	}
  
  	ev->set_scancode(scancode);
  	ev->set_physical_scancode(phy_scancode);
  
  	ev->set_unicode(val);
  	ev->set_pressed(p_pressed);
  
  	_set_key_modifier_state(ev);
  
  	if (val == '\n') {
  		ev->set_scancode(KEY_ENTER);
  	} else if (val == 61448) {
  		ev->set_scancode(KEY_BACKSPACE);
  		ev->set_unicode(KEY_BACKSPACE);
  	} else if (val == 61453) {
  		ev->set_scancode(KEY_ENTER);
  		ev->set_unicode(KEY_ENTER);
  	} else if (p_scancode == 4) {
  		if (MainLoop *main_loop = OS::get_singleton()->get_main_loop()) {
  			main_loop->call_deferred("notification", MainLoop::NOTIFICATION_WM_GO_BACK_REQUEST);
  		}
  	}
  
  	input->parse_input_event(ev);
  }
  
  void AndroidInputHandler::process_touch(int p_event, int p_pointer, const Vector<TouchPos> &p_points) {
  	switch (p_event) {
  		case AMOTION_EVENT_ACTION_DOWN: { //gesture begin
  			if (touch.size()) {
  				//end all if exist
  				for (int i = 0; i < touch.size(); i++) {
  					Ref<InputEventScreenTouch> ev;
  					ev.instance();
  					ev->set_index(touch[i].id);
  					ev->set_pressed(false);
  					ev->set_position(touch[i].pos);
  					input->parse_input_event(ev);
  				}
  			}
  
  			touch.resize(p_points.size());
  			for (int i = 0; i < p_points.size(); i++) {
  				touch.write[i].id = p_points[i].id;
  				touch.write[i].pos = p_points[i].pos;
  			}
  
  			//send touch
  			for (int i = 0; i < touch.size(); i++) {
  				Ref<InputEventScreenTouch> ev;
  				ev.instance();
  				ev->set_index(touch[i].id);
  				ev->set_pressed(true);
  				ev->set_position(touch[i].pos);
  				input->parse_input_event(ev);
  			}
  
  		} break;
  		case AMOTION_EVENT_ACTION_MOVE: { //motion
  			ERR_FAIL_COND(touch.size() != p_points.size());
  
  			for (int i = 0; i < touch.size(); i++) {
  				int idx = -1;
  				for (int j = 0; j < p_points.size(); j++) {
  					if (touch[i].id == p_points[j].id) {
  						idx = j;
  						break;
  					}
  				}
  
  				ERR_CONTINUE(idx == -1);
  
  				if (touch[i].pos == p_points[idx].pos)
  					continue; //no move unncesearily
  
  				Ref<InputEventScreenDrag> ev;
  				ev.instance();
  				ev->set_index(touch[i].id);
  				ev->set_position(p_points[idx].pos);
  				ev->set_relative(p_points[idx].pos - touch[i].pos);
  				input->parse_input_event(ev);
  				touch.write[i].pos = p_points[idx].pos;
  			}
  
  		} break;
  		case AMOTION_EVENT_ACTION_CANCEL:
  		case AMOTION_EVENT_ACTION_UP: { //release
  			if (touch.size()) {
  				//end all if exist
  				for (int i = 0; i < touch.size(); i++) {
  					Ref<InputEventScreenTouch> ev;
  					ev.instance();
  					ev->set_index(touch[i].id);
  					ev->set_pressed(false);
  					ev->set_position(touch[i].pos);
  					input->parse_input_event(ev);
  				}
  				touch.clear();
  			}
  		} break;
  		case AMOTION_EVENT_ACTION_POINTER_DOWN: { // add touch
  			for (int i = 0; i < p_points.size(); i++) {
  				if (p_points[i].id == p_pointer) {
  					TouchPos tp = p_points[i];
  					touch.push_back(tp);
  
  					Ref<InputEventScreenTouch> ev;
  					ev.instance();
  
  					ev->set_index(tp.id);
  					ev->set_pressed(true);
  					ev->set_position(tp.pos);
  					input->parse_input_event(ev);
  
  					break;
  				}
  			}
  		} break;
  		case AMOTION_EVENT_ACTION_POINTER_UP: { // remove touch
  			for (int i = 0; i < touch.size(); i++) {
  				if (touch[i].id == p_pointer) {
  					Ref<InputEventScreenTouch> ev;
  					ev.instance();
  					ev->set_index(touch[i].id);
  					ev->set_pressed(false);
  					ev->set_position(touch[i].pos);
  					input->parse_input_event(ev);
  					touch.remove(i);
  
  					break;
  				}
  			}
  		} break;
  	}
  }
  
  void AndroidInputHandler::process_hover(int p_type, Point2 p_pos) {
  	// https://developer.android.com/reference/android/view/MotionEvent.html#ACTION_HOVER_ENTER
  	switch (p_type) {
  		case AMOTION_EVENT_ACTION_HOVER_MOVE: // hover move
  		case AMOTION_EVENT_ACTION_HOVER_ENTER: // hover enter
  		case AMOTION_EVENT_ACTION_HOVER_EXIT: { // hover exit
  			Ref<InputEventMouseMotion> ev;
  			ev.instance();
  			_set_key_modifier_state(ev);
  			ev->set_position(p_pos);
  			ev->set_global_position(p_pos);
  			ev->set_relative(p_pos - hover_prev_pos);
  			input->parse_input_event(ev);
  			hover_prev_pos = p_pos;
  		} break;
  	}
  }
  
  void AndroidInputHandler::process_mouse_event(int event_action, int event_android_buttons_mask, Point2 event_pos, float event_vertical_factor, float event_horizontal_factor) {
  	int event_buttons_mask = _android_button_mask_to_pandemonium_button_mask(event_android_buttons_mask);
  	switch (event_action) {
  		case AMOTION_EVENT_ACTION_BUTTON_PRESS:
  		case AMOTION_EVENT_ACTION_BUTTON_RELEASE: {
  			Ref<InputEventMouseButton> ev;
  			ev.instance();
  			_set_key_modifier_state(ev);
  			ev->set_position(event_pos);
  			ev->set_global_position(event_pos);
  			ev->set_pressed(event_action == AMOTION_EVENT_ACTION_BUTTON_PRESS);
  			int changed_button_mask = buttons_state ^ event_buttons_mask;
  
  			buttons_state = event_buttons_mask;
  
  			ev->set_button_index(_button_index_from_mask(changed_button_mask));
  			ev->set_button_mask(event_buttons_mask);
  			input->parse_input_event(ev);
  		} break;
  
  		case AMOTION_EVENT_ACTION_MOVE: {
  			Ref<InputEventMouseMotion> ev;
  			ev.instance();
  			_set_key_modifier_state(ev);
  			ev->set_position(event_pos);
  			ev->set_global_position(event_pos);
  			ev->set_relative(event_pos - hover_prev_pos);
  			ev->set_button_mask(event_buttons_mask);
  			input->parse_input_event(ev);
  			hover_prev_pos = event_pos;
  		} break;
  		case AMOTION_EVENT_ACTION_SCROLL: {
  			Ref<InputEventMouseButton> ev;
  			ev.instance();
  			_set_key_modifier_state(ev);
  			ev->set_position(event_pos);
  			ev->set_global_position(event_pos);
  			ev->set_pressed(true);
  			buttons_state = event_buttons_mask;
  			if (event_vertical_factor > 0) {
  				_wheel_button_click(event_buttons_mask, ev, BUTTON_WHEEL_UP, event_vertical_factor);
  			} else if (event_vertical_factor < 0) {
  				_wheel_button_click(event_buttons_mask, ev, BUTTON_WHEEL_DOWN, -event_vertical_factor);
  			}
  
  			if (event_horizontal_factor > 0) {
  				_wheel_button_click(event_buttons_mask, ev, BUTTON_WHEEL_RIGHT, event_horizontal_factor);
  			} else if (event_horizontal_factor < 0) {
  				_wheel_button_click(event_buttons_mask, ev, BUTTON_WHEEL_LEFT, -event_horizontal_factor);
  			}
  		} break;
  	}
  }
  
  void AndroidInputHandler::_wheel_button_click(int event_buttons_mask, const Ref<InputEventMouseButton> &ev, int wheel_button, float factor) {
  	Ref<InputEventMouseButton> evd = ev->duplicate();
  	evd->set_button_index(wheel_button);
  	evd->set_button_mask(event_buttons_mask ^ (1 << (wheel_button - 1)));
  	evd->set_factor(factor);
  	input->parse_input_event(evd);
  	Ref<InputEventMouseButton> evdd = evd->duplicate();
  	evdd->set_pressed(false);
  	evdd->set_button_mask(event_buttons_mask);
  	input->parse_input_event(evdd);
  }
  
  void AndroidInputHandler::process_double_tap(int event_android_button_mask, Point2 p_pos) {
  	int event_button_mask = _android_button_mask_to_pandemonium_button_mask(event_android_button_mask);
  	Ref<InputEventMouseButton> ev;
  	ev.instance();
  	_set_key_modifier_state(ev);
  	ev->set_position(p_pos);
  	ev->set_global_position(p_pos);
  	ev->set_pressed(event_button_mask != 0);
  	ev->set_button_index(_button_index_from_mask(event_button_mask));
  	ev->set_button_mask(event_button_mask);
  	ev->set_doubleclick(true);
  	input->parse_input_event(ev);
  }
  
  void AndroidInputHandler::process_scroll(Point2 p_pos) {
  	Ref<InputEventPanGesture> ev;
  	ev.instance();
  	_set_key_modifier_state(ev);
  	ev->set_position(p_pos);
  	ev->set_delta(p_pos - scroll_prev_pos);
  	input->parse_input_event(ev);
  	scroll_prev_pos = p_pos;
  }
  
  int AndroidInputHandler::_button_index_from_mask(int button_mask) {
  	switch (button_mask) {
  		case BUTTON_MASK_LEFT:
  			return BUTTON_LEFT;
  		case BUTTON_MASK_RIGHT:
  			return BUTTON_RIGHT;
  		case BUTTON_MASK_MIDDLE:
  			return BUTTON_MIDDLE;
  		case BUTTON_MASK_XBUTTON1:
  			return BUTTON_XBUTTON1;
  		case BUTTON_MASK_XBUTTON2:
  			return BUTTON_XBUTTON2;
  		default:
  			return 0;
  	}
  }
  
  int AndroidInputHandler::_android_button_mask_to_pandemonium_button_mask(int android_button_mask) {
  	int pandemonium_button_mask = 0;
  	if (android_button_mask & AMOTION_EVENT_BUTTON_PRIMARY) {
  		pandemonium_button_mask |= BUTTON_MASK_LEFT;
  	}
  	if (android_button_mask & AMOTION_EVENT_BUTTON_SECONDARY) {
  		pandemonium_button_mask |= BUTTON_MASK_RIGHT;
  	}
  	if (android_button_mask & AMOTION_EVENT_BUTTON_TERTIARY) {
  		pandemonium_button_mask |= BUTTON_MASK_MIDDLE;
  	}
  	if (android_button_mask & AMOTION_EVENT_BUTTON_BACK) {
  		pandemonium_button_mask |= BUTTON_MASK_XBUTTON1;
  	}
  	if (android_button_mask & AMOTION_EVENT_BUTTON_FORWARD) {
  		pandemonium_button_mask |= BUTTON_MASK_XBUTTON2;
  	}
  
  	return pandemonium_button_mask;
  }
  
  void AndroidInputHandler::joy_connection_changed(int p_device, bool p_connected, String p_name) {
  	input->joy_connection_changed(p_device, p_connected, p_name, "");
  }
  