godot/platform/android/android_input_handler.h

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/*  android_input_handler.h                                              */
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#ifndef ANDROID_INPUT_HANDLER_H
#define ANDROID_INPUT_HANDLER_H

#include "core/input/input.h"

// This class encapsulates all the handling of input events that come from the Android UI thread.
// Remarks:
// - It's not thread-safe by itself, so its functions must only be called on a single thread, which is the Android UI thread.
// - Its functions must only call thread-safe methods.
class AndroidInputHandler {
public:
	struct TouchPos {
		int id = 0;
		Point2 pos;
	};

	enum {
		JOY_EVENT_BUTTON = 0,
		JOY_EVENT_AXIS = 1,
		JOY_EVENT_HAT = 2
	};

	struct JoypadEvent {
		int device = 0;
		int type = 0;
		int index = 0; // Can be either JoyAxis or JoyButton.
		bool pressed = false;
		float value = 0;
		HatMask hat = HatMask::CENTER;
	};

private:
	bool alt_mem = false;
	bool shift_mem = false;
	bool control_mem = false;
	bool meta_mem = false;

	MouseButton buttons_state = MouseButton::NONE;

	Vector<TouchPos> touch;
	Point2 hover_prev_pos; // needed to calculate the relative position on hover events
	Point2 scroll_prev_pos; // needed to calculate the relative position on scroll events

	void _set_key_modifier_state(Ref<InputEventWithModifiers> ev);

	static MouseButton _button_index_from_mask(MouseButton button_mask);
	static MouseButton _android_button_mask_to_godot_button_mask(int android_button_mask);

	void _wheel_button_click(MouseButton event_buttons_mask, const Ref<InputEventMouseButton> &ev, MouseButton wheel_button, float factor);

public:
	void process_touch(int p_event, int p_pointer, const Vector<TouchPos> &p_points);
	void process_hover(int p_type, Point2 p_pos);
	void process_mouse_event(int input_device, int event_action, int event_android_buttons_mask, Point2 event_pos, float event_vertical_factor = 0, float event_horizontal_factor = 0);
	void process_double_tap(int event_android_button_mask, Point2 p_pos);
	void process_scroll(Point2 p_pos);
	void process_joy_event(JoypadEvent p_event);
	void process_key_event(int p_keycode, int p_scancode, int p_unicode_char, bool p_pressed);
};

#endif