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Diffstat (limited to 'widget/gonk/libui/KeyCharacterMap.h')
| -rw-r--r-- | widget/gonk/libui/KeyCharacterMap.h | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/widget/gonk/libui/KeyCharacterMap.h b/widget/gonk/libui/KeyCharacterMap.h new file mode 100644 index 0000000000..c7a6841059 --- /dev/null +++ b/widget/gonk/libui/KeyCharacterMap.h @@ -0,0 +1,257 @@ +/* + * 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 _ANDROIDFW_KEY_CHARACTER_MAP_H +#define _ANDROIDFW_KEY_CHARACTER_MAP_H + +#include <stdint.h> + +#if HAVE_ANDROID_OS +#include <binder/IBinder.h> +#endif + +#include "Input.h" +#include <utils/Errors.h> +#include <utils/KeyedVector.h> +#include "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 // _ANDROIDFW_KEY_CHARACTER_MAP_H |