| /* |
| * 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> |
| |
| #ifdef __ANDROID__ |
| #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; |
| |
| #ifdef __ANDROID__ |
| /* 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 |