859d23d92b
Character events are created via a dedicated 'Event' constructor that takes an 'Event:Utf8' object as argument. Internally, the character is kept in the '_code' member. The 'Utf8' value can by retrieved by the recipient via the new 'utf8' method. Issue #2264
129 lines
2.9 KiB
C++
129 lines
2.9 KiB
C++
/*
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* \brief Input event structure
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* \author Norman Feske
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* \date 2006-08-16
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__INPUT__EVENT_H_
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#define _INCLUDE__INPUT__EVENT_H_
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#include <input/keycodes.h>
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namespace Input { class Event; }
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class Input::Event
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{
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public:
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enum Type { INVALID, MOTION, PRESS, RELEASE, WHEEL, FOCUS, LEAVE, TOUCH,
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CHARACTER };
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private:
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Type _type = INVALID;
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/*
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* For PRESS and RELEASE events, '_code' contains the key code.
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* For FOCUS events, '_code' is set to 1 (focus) or 0 (unfocus).
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*/
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int _code = 0;
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/*
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* Absolute pointer position coordinates
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*/
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int _ax = 0, _ay = 0;
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/*
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* Relative pointer motion vector
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*/
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int _rx = 0, _ry = 0;
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public:
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/**
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* UTF8-encoded symbolic character
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*/
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struct Utf8
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{
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typedef unsigned char byte;
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byte b0, b1, b2, b3;
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Utf8(byte b0, byte b1 = 0, byte b2 = 0, byte b3 = 0)
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: b0(b0), b1(b1), b2(b2), b3(b3) { }
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};
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/**
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* Default constructor creates an invalid event
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*/
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Event() { }
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/**
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* Constructor creates a low-level event
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*/
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Event(Type type, int code, int ax, int ay, int rx, int ry):
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_type(type), _code(code),
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_ax(ax), _ay(ay), _rx(rx), _ry(ry) { }
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/**
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* Constructor creates a symbolic character event
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*/
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Event(Utf8 const &utf8)
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:
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_type(CHARACTER),
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_code(((unsigned)utf8.b3 << 24) | ((unsigned)utf8.b2 << 16) |
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((unsigned)utf8.b1 << 8) | ((unsigned)utf8.b0 << 0))
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{ }
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/**
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* Accessors
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*/
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Type type() const { return _type; }
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int code() const { return _code; }
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int ax() const { return _ax; }
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int ay() const { return _ay; }
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int rx() const { return _rx; }
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int ry() const { return _ry; }
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/**
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* Return symbolic character encoded as UTF8 byte sequence
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*
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* This method must only be called if type is CHARACTER.
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*/
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Utf8 utf8() const { return Utf8(_code, _code >> 8, _code >> 16, _code >> 24); }
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/**
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* Return key code for press/release events
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*/
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Keycode keycode() const
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{
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return _type == PRESS || _type == RELEASE ? (Keycode)_code : KEY_UNKNOWN;
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}
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bool absolute_motion() const { return _type == MOTION && !_rx && !_ry; }
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bool relative_motion() const { return _type == MOTION && (_rx || _ry); }
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bool touch_release() const { return _type == TOUCH && (_rx == -1) && (_ry == -1); }
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/*
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* \deprecated use methods without the 'is_' prefix instead
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*/
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bool is_absolute_motion() const { return absolute_motion(); }
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bool is_relative_motion() const { return relative_motion(); }
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bool is_touch_release() const { return touch_release(); }
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static Event create_touch_event(int ax, int ay, int id, bool last = false)
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{
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return Event(Type::TOUCH, id, ax, ay, last ? -1 : 0, last ? -1 : 0);
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}
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};
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#endif /* _INCLUDE__INPUT__EVENT_H_ */
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