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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _LIBINPUT_KEY_CHARACTER_MAP_H
#define _LIBINPUT_KEY_CHARACTER_MAP_H
#include <stdint.h>
#if HAVE_ANDROID_OS
#include <binder/IBinder.h>
#endif
#include <input/Input.h>
#include <utils/Errors.h>
#include <utils/KeyedVector.h>
#include <utils/Tokenizer.h>
#include <utils/String8.h>
#include <utils/Unicode.h>
#include <utils/RefBase.h>
namespace android {
/**
* Describes a mapping from Android key codes to characters.
* Also specifies other functions of the keyboard such as the keyboard type
* and key modifier semantics.
*
* This object is immutable after it has been loaded.
*/
class KeyCharacterMap : public RefBase {
public:
enum KeyboardType {
KEYBOARD_TYPE_UNKNOWN = 0,
KEYBOARD_TYPE_NUMERIC = 1,
KEYBOARD_TYPE_PREDICTIVE = 2,
KEYBOARD_TYPE_ALPHA = 3,
KEYBOARD_TYPE_FULL = 4,
KEYBOARD_TYPE_SPECIAL_FUNCTION = 5,
KEYBOARD_TYPE_OVERLAY = 6,
};
enum Format {
// Base keyboard layout, may contain device-specific options, such as "type" declaration.
FORMAT_BASE = 0,
// Overlay keyboard layout, more restrictive, may be published by applications,
// cannot override device-specific options.
FORMAT_OVERLAY = 1,
// Either base or overlay layout ok.
FORMAT_ANY = 2,
};
// Substitute key code and meta state for fallback action.
struct FallbackAction {
int32_t keyCode;
int32_t metaState;
};
/* Loads a key character map from a file. */
static status_t load(const String8& filename, Format format, sp<KeyCharacterMap>* outMap);
/* Loads a key character map from its string contents. */
static status_t loadContents(const String8& filename,
const char* contents, Format format, sp<KeyCharacterMap>* outMap);
/* Combines a base key character map and an overlay. */
static sp<KeyCharacterMap> combine(const sp<KeyCharacterMap>& base,
const sp<KeyCharacterMap>& overlay);
/* Returns an empty key character map. */
static sp<KeyCharacterMap> empty();
/* Gets the keyboard type. */
int32_t getKeyboardType() const;
/* Gets the primary character for this key as in the label physically printed on it.
* Returns 0 if none (eg. for non-printing keys). */
char16_t getDisplayLabel(int32_t keyCode) const;
/* Gets the Unicode character for the number or symbol generated by the key
* when the keyboard is used as a dialing pad.
* Returns 0 if no number or symbol is generated.
*/
char16_t getNumber(int32_t keyCode) const;
/* Gets the Unicode character generated by the key and meta key modifiers.
* Returns 0 if no character is generated.
*/
char16_t getCharacter(int32_t keyCode, int32_t metaState) const;
/* Gets the fallback action to use by default if the application does not
* handle the specified key.
* Returns true if an action was available, false if none.
*/
bool getFallbackAction(int32_t keyCode, int32_t metaState,
FallbackAction* outFallbackAction) const;
/* Gets the first matching Unicode character that can be generated by the key,
* preferring the one with the specified meta key modifiers.
* Returns 0 if no matching character is generated.
*/
char16_t getMatch(int32_t keyCode, const char16_t* chars,
size_t numChars, int32_t metaState) const;
/* Gets a sequence of key events that could plausibly generate the specified
* character sequence. Returns false if some of the characters cannot be generated.
*/
bool getEvents(int32_t deviceId, const char16_t* chars, size_t numChars,
Vector<KeyEvent>& outEvents) const;
/* Maps a scan code and usage code to a key code, in case this key map overrides
* the mapping in some way. */
status_t mapKey(int32_t scanCode, int32_t usageCode, int32_t* outKeyCode) const;
#if HAVE_ANDROID_OS
/* Reads a key map from a parcel. */
static sp<KeyCharacterMap> readFromParcel(Parcel* parcel);
/* Writes a key map to a parcel. */
void writeToParcel(Parcel* parcel) const;
#endif
protected:
virtual ~KeyCharacterMap();
private:
struct Behavior {
Behavior();
Behavior(const Behavior& other);
/* The next behavior in the list, or NULL if none. */
Behavior* next;
/* The meta key modifiers for this behavior. */
int32_t metaState;
/* The character to insert. */
char16_t character;
/* The fallback keycode if the key is not handled. */
int32_t fallbackKeyCode;
};
struct Key {
Key();
Key(const Key& other);
~Key();
/* The single character label printed on the key, or 0 if none. */
char16_t label;
/* The number or symbol character generated by the key, or 0 if none. */
char16_t number;
/* The list of key behaviors sorted from most specific to least specific
* meta key binding. */
Behavior* firstBehavior;
};
class Parser {
enum State {
STATE_TOP = 0,
STATE_KEY = 1,
};
enum {
PROPERTY_LABEL = 1,
PROPERTY_NUMBER = 2,
PROPERTY_META = 3,
};
struct Property {
inline Property(int32_t property = 0, int32_t metaState = 0) :
property(property), metaState(metaState) { }
int32_t property;
int32_t metaState;
};
KeyCharacterMap* mMap;
Tokenizer* mTokenizer;
Format mFormat;
State mState;
int32_t mKeyCode;
public:
Parser(KeyCharacterMap* map, Tokenizer* tokenizer, Format format);
~Parser();
status_t parse();
private:
status_t parseType();
status_t parseMap();
status_t parseMapKey();
status_t parseKey();
status_t parseKeyProperty();
status_t finishKey(Key* key);
status_t parseModifier(const String8& token, int32_t* outMetaState);
status_t parseCharacterLiteral(char16_t* outCharacter);
};
static sp<KeyCharacterMap> sEmpty;
KeyedVector<int32_t, Key*> mKeys;
int mType;
KeyedVector<int32_t, int32_t> mKeysByScanCode;
KeyedVector<int32_t, int32_t> mKeysByUsageCode;
KeyCharacterMap();
KeyCharacterMap(const KeyCharacterMap& other);
bool getKey(int32_t keyCode, const Key** outKey) const;
bool getKeyBehavior(int32_t keyCode, int32_t metaState,
const Key** outKey, const Behavior** outBehavior) const;
static bool matchesMetaState(int32_t eventMetaState, int32_t behaviorMetaState);
bool findKey(char16_t ch, int32_t* outKeyCode, int32_t* outMetaState) const;
static status_t load(Tokenizer* tokenizer, Format format, sp<KeyCharacterMap>* outMap);
static void addKey(Vector<KeyEvent>& outEvents,
int32_t deviceId, int32_t keyCode, int32_t metaState, bool down, nsecs_t time);
static void addMetaKeys(Vector<KeyEvent>& outEvents,
int32_t deviceId, int32_t metaState, bool down, nsecs_t time,
int32_t* currentMetaState);
static bool addSingleEphemeralMetaKey(Vector<KeyEvent>& outEvents,
int32_t deviceId, int32_t metaState, bool down, nsecs_t time,
int32_t keyCode, int32_t keyMetaState,
int32_t* currentMetaState);
static void addDoubleEphemeralMetaKey(Vector<KeyEvent>& outEvents,
int32_t deviceId, int32_t metaState, bool down, nsecs_t time,
int32_t leftKeyCode, int32_t leftKeyMetaState,
int32_t rightKeyCode, int32_t rightKeyMetaState,
int32_t eitherKeyMetaState,
int32_t* currentMetaState);
static void addLockedMetaKey(Vector<KeyEvent>& outEvents,
int32_t deviceId, int32_t metaState, nsecs_t time,
int32_t keyCode, int32_t keyMetaState,
int32_t* currentMetaState);
};
} // namespace android
#endif // _LIBINPUT_KEY_CHARACTER_MAP_H
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