1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef _ANDROIDFW_KEY_CHARACTER_MAP_H 18 #define _ANDROIDFW_KEY_CHARACTER_MAP_H 19 20 #include <stdint.h> 21 22 #if HAVE_ANDROID_OS 23 #include <binder/IBinder.h> 24 #endif 25 26 #include <androidfw/Input.h> 27 #include <utils/Errors.h> 28 #include <utils/KeyedVector.h> 29 #include <utils/Tokenizer.h> 30 #include <utils/String8.h> 31 #include <utils/Unicode.h> 32 #include <utils/RefBase.h> 33 34 namespace android { 35 36 /** 37 * Describes a mapping from Android key codes to characters. 38 * Also specifies other functions of the keyboard such as the keyboard type 39 * and key modifier semantics. 40 * 41 * This object is immutable after it has been loaded. 42 */ 43 class KeyCharacterMap : public RefBase { 44 public: 45 enum KeyboardType { 46 KEYBOARD_TYPE_UNKNOWN = 0, 47 KEYBOARD_TYPE_NUMERIC = 1, 48 KEYBOARD_TYPE_PREDICTIVE = 2, 49 KEYBOARD_TYPE_ALPHA = 3, 50 KEYBOARD_TYPE_FULL = 4, 51 KEYBOARD_TYPE_SPECIAL_FUNCTION = 5, 52 KEYBOARD_TYPE_OVERLAY = 6, 53 }; 54 55 enum Format { 56 // Base keyboard layout, may contain device-specific options, such as "type" declaration. 57 FORMAT_BASE = 0, 58 // Overlay keyboard layout, more restrictive, may be published by applications, 59 // cannot override device-specific options. 60 FORMAT_OVERLAY = 1, 61 // Either base or overlay layout ok. 62 FORMAT_ANY = 2, 63 }; 64 65 // Substitute key code and meta state for fallback action. 66 struct FallbackAction { 67 int32_t keyCode; 68 int32_t metaState; 69 }; 70 71 /* Loads a key character map from a file. */ 72 static status_t load(const String8& filename, Format format, sp<KeyCharacterMap>* outMap); 73 74 /* Loads a key character map from its string contents. */ 75 static status_t loadContents(const String8& filename, 76 const char* contents, Format format, sp<KeyCharacterMap>* outMap); 77 78 /* Combines a base key character map and an overlay. */ 79 static sp<KeyCharacterMap> combine(const sp<KeyCharacterMap>& base, 80 const sp<KeyCharacterMap>& overlay); 81 82 /* Returns an empty key character map. */ 83 static sp<KeyCharacterMap> empty(); 84 85 /* Gets the keyboard type. */ 86 int32_t getKeyboardType() const; 87 88 /* Gets the primary character for this key as in the label physically printed on it. 89 * Returns 0 if none (eg. for non-printing keys). */ 90 char16_t getDisplayLabel(int32_t keyCode) const; 91 92 /* Gets the Unicode character for the number or symbol generated by the key 93 * when the keyboard is used as a dialing pad. 94 * Returns 0 if no number or symbol is generated. 95 */ 96 char16_t getNumber(int32_t keyCode) const; 97 98 /* Gets the Unicode character generated by the key and meta key modifiers. 99 * Returns 0 if no character is generated. 100 */ 101 char16_t getCharacter(int32_t keyCode, int32_t metaState) const; 102 103 /* Gets the fallback action to use by default if the application does not 104 * handle the specified key. 105 * Returns true if an action was available, false if none. 106 */ 107 bool getFallbackAction(int32_t keyCode, int32_t metaState, 108 FallbackAction* outFallbackAction) const; 109 110 /* Gets the first matching Unicode character that can be generated by the key, 111 * preferring the one with the specified meta key modifiers. 112 * Returns 0 if no matching character is generated. 113 */ 114 char16_t getMatch(int32_t keyCode, const char16_t* chars, 115 size_t numChars, int32_t metaState) const; 116 117 /* Gets a sequence of key events that could plausibly generate the specified 118 * character sequence. Returns false if some of the characters cannot be generated. 119 */ 120 bool getEvents(int32_t deviceId, const char16_t* chars, size_t numChars, 121 Vector<KeyEvent>& outEvents) const; 122 123 /* Maps a scan code and usage code to a key code, in case this key map overrides 124 * the mapping in some way. */ 125 status_t mapKey(int32_t scanCode, int32_t usageCode, int32_t* outKeyCode) const; 126 127 #if HAVE_ANDROID_OS 128 /* Reads a key map from a parcel. */ 129 static sp<KeyCharacterMap> readFromParcel(Parcel* parcel); 130 131 /* Writes a key map to a parcel. */ 132 void writeToParcel(Parcel* parcel) const; 133 #endif 134 135 protected: 136 virtual ~KeyCharacterMap(); 137 138 private: 139 struct Behavior { 140 Behavior(); 141 Behavior(const Behavior& other); 142 143 /* The next behavior in the list, or NULL if none. */ 144 Behavior* next; 145 146 /* The meta key modifiers for this behavior. */ 147 int32_t metaState; 148 149 /* The character to insert. */ 150 char16_t character; 151 152 /* The fallback keycode if the key is not handled. */ 153 int32_t fallbackKeyCode; 154 }; 155 156 struct Key { 157 Key(); 158 Key(const Key& other); 159 ~Key(); 160 161 /* The single character label printed on the key, or 0 if none. */ 162 char16_t label; 163 164 /* The number or symbol character generated by the key, or 0 if none. */ 165 char16_t number; 166 167 /* The list of key behaviors sorted from most specific to least specific 168 * meta key binding. */ 169 Behavior* firstBehavior; 170 }; 171 172 class Parser { 173 enum State { 174 STATE_TOP = 0, 175 STATE_KEY = 1, 176 }; 177 178 enum { 179 PROPERTY_LABEL = 1, 180 PROPERTY_NUMBER = 2, 181 PROPERTY_META = 3, 182 }; 183 184 struct Property { 185 inline Property(int32_t property = 0, int32_t metaState = 0) : 186 property(property), metaState(metaState) { } 187 188 int32_t property; 189 int32_t metaState; 190 }; 191 192 KeyCharacterMap* mMap; 193 Tokenizer* mTokenizer; 194 Format mFormat; 195 State mState; 196 int32_t mKeyCode; 197 198 public: 199 Parser(KeyCharacterMap* map, Tokenizer* tokenizer, Format format); 200 ~Parser(); 201 status_t parse(); 202 203 private: 204 status_t parseType(); 205 status_t parseMap(); 206 status_t parseMapKey(); 207 status_t parseKey(); 208 status_t parseKeyProperty(); 209 status_t finishKey(Key* key); 210 status_t parseModifier(const String8& token, int32_t* outMetaState); 211 status_t parseCharacterLiteral(char16_t* outCharacter); 212 }; 213 214 static sp<KeyCharacterMap> sEmpty; 215 216 KeyedVector<int32_t, Key*> mKeys; 217 int mType; 218 219 KeyedVector<int32_t, int32_t> mKeysByScanCode; 220 KeyedVector<int32_t, int32_t> mKeysByUsageCode; 221 222 KeyCharacterMap(); 223 KeyCharacterMap(const KeyCharacterMap& other); 224 225 bool getKey(int32_t keyCode, const Key** outKey) const; 226 bool getKeyBehavior(int32_t keyCode, int32_t metaState, 227 const Key** outKey, const Behavior** outBehavior) const; 228 static bool matchesMetaState(int32_t eventMetaState, int32_t behaviorMetaState); 229 230 bool findKey(char16_t ch, int32_t* outKeyCode, int32_t* outMetaState) const; 231 232 static status_t load(Tokenizer* tokenizer, Format format, sp<KeyCharacterMap>* outMap); 233 234 static void addKey(Vector<KeyEvent>& outEvents, 235 int32_t deviceId, int32_t keyCode, int32_t metaState, bool down, nsecs_t time); 236 static void addMetaKeys(Vector<KeyEvent>& outEvents, 237 int32_t deviceId, int32_t metaState, bool down, nsecs_t time, 238 int32_t* currentMetaState); 239 static bool addSingleEphemeralMetaKey(Vector<KeyEvent>& outEvents, 240 int32_t deviceId, int32_t metaState, bool down, nsecs_t time, 241 int32_t keyCode, int32_t keyMetaState, 242 int32_t* currentMetaState); 243 static void addDoubleEphemeralMetaKey(Vector<KeyEvent>& outEvents, 244 int32_t deviceId, int32_t metaState, bool down, nsecs_t time, 245 int32_t leftKeyCode, int32_t leftKeyMetaState, 246 int32_t rightKeyCode, int32_t rightKeyMetaState, 247 int32_t eitherKeyMetaState, 248 int32_t* currentMetaState); 249 static void addLockedMetaKey(Vector<KeyEvent>& outEvents, 250 int32_t deviceId, int32_t metaState, nsecs_t time, 251 int32_t keyCode, int32_t keyMetaState, 252 int32_t* currentMetaState); 253 }; 254 255 } // namespace android 256 257 #endif // _ANDROIDFW_KEY_CHARACTER_MAP_H 258
