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Allow defining replacement key events in keymap

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Currently keyboard maps allow to assign character sequences to key
events and allow specifying a so-called "fallback" key events that are
re-injected into input stream if target application indicates that it
was not able to handle the original key event. Unfortunately there is no
way to perform substitution before handing the event to applicationis.

This change adds a new keymap keyword "replace" that allows users query
"replacement" actions for key (if any), with the intent that such
replacement happens early in the event handling process.

Bug: 24504154

Change-Id: I3e6a2476c856524171df00ad22ff56f2018c1278
This commit is contained in:
Dmitry Torokhov 2015-09-17 18:04:50 -07:00
parent ce92ce9bef
commit 115f93eeeb
4 changed files with 117 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/input/KeyCharacterMap.h
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@ -124,6 +124,11 @@ public:
* the mapping in some way. */
status_t mapKey(int32_t scanCode, int32_t usageCode, int32_t* outKeyCode) const;
/* Tries to find a replacement key code for a given key code and meta state
* in character map. */
void tryRemapKey(int32_t scanCode, int32_t metaState,
int32_t* outKeyCode, int32_t* outMetaState) const;
#if HAVE_ANDROID_OS
/* Reads a key map from a parcel. */
static sp<KeyCharacterMap> readFromParcel(Parcel* parcel);
@ -151,6 +156,9 @@ private:
/* The fallback keycode if the key is not handled. */
int32_t fallbackKeyCode;
/* The replacement keycode if the key has to be replaced outright. */
int32_t replacementKeyCode;
};
struct Key {

7
include/input/Keyboard.h
View File

@ -87,6 +87,13 @@ extern bool isEligibleBuiltInKeyboard(const InputDeviceIdentifier& deviceIdentif
*/
extern int32_t updateMetaState(int32_t keyCode, bool down, int32_t oldMetaState);
/**
* Normalizes the meta state such that if either the left or right modifier
* meta state bits are set then the result will also include the universal
* bit for that modifier.
*/
extern int32_t normalizeMetaState(int32_t oldMetaState);
/**
* Returns true if a key is a meta key like ALT or CAPS_LOCK.
*/

98
libs/input/KeyCharacterMap.cpp
View File

@ -332,22 +332,22 @@ status_t KeyCharacterMap::mapKey(int32_t scanCode, int32_t usageCode, int32_t* o
if (usageCode) {
ssize_t index = mKeysByUsageCode.indexOfKey(usageCode);
if (index >= 0) {
*outKeyCode = mKeysByUsageCode.valueAt(index);
#if DEBUG_MAPPING
ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Result keyCode=%d.",
scanCode, usageCode, *outKeyCode);
#endif
*outKeyCode = mKeysByUsageCode.valueAt(index);
return OK;
}
}
if (scanCode) {
ssize_t index = mKeysByScanCode.indexOfKey(scanCode);
if (index >= 0) {
*outKeyCode = mKeysByScanCode.valueAt(index);
#if DEBUG_MAPPING
ALOGD("mapKey: scanCode=%d, usageCode=0x%08x ~ Result keyCode=%d.",
scanCode, usageCode, *outKeyCode);
#endif
*outKeyCode = mKeysByScanCode.valueAt(index);
return OK;
}
}
@ -359,6 +359,48 @@ status_t KeyCharacterMap::mapKey(int32_t scanCode, int32_t usageCode, int32_t* o
return NAME_NOT_FOUND;
}
void KeyCharacterMap::tryRemapKey(int32_t keyCode, int32_t metaState,
int32_t *outKeyCode, int32_t *outMetaState) const {
*outKeyCode = keyCode;
*outMetaState = metaState;
const Key* key;
const Behavior* behavior;
if (getKeyBehavior(keyCode, metaState, &key, &behavior)) {
if (behavior->replacementKeyCode) {
*outKeyCode = behavior->replacementKeyCode;
int32_t newMetaState = metaState & ~behavior->metaState;
// Reset dependent meta states.
if (behavior->metaState & AMETA_ALT_ON) {
newMetaState &= ~(AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON);
}
if (behavior->metaState & (AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON)) {
newMetaState &= ~AMETA_ALT_ON;
}
if (behavior->metaState & AMETA_CTRL_ON) {
newMetaState &= ~(AMETA_CTRL_LEFT_ON | AMETA_CTRL_RIGHT_ON);
}
if (behavior->metaState & (AMETA_CTRL_LEFT_ON | AMETA_CTRL_RIGHT_ON)) {
newMetaState &= ~AMETA_CTRL_ON;
}
if (behavior->metaState & AMETA_SHIFT_ON) {
newMetaState &= ~(AMETA_SHIFT_LEFT_ON | AMETA_SHIFT_RIGHT_ON);
}
if (behavior->metaState & (AMETA_SHIFT_LEFT_ON | AMETA_SHIFT_RIGHT_ON)) {
newMetaState &= ~AMETA_SHIFT_ON;
}
// ... and put universal bits back if needed
*outMetaState = normalizeMetaState(newMetaState);
}
}
#if DEBUG_MAPPING
ALOGD("tryRemapKey: keyCode=%d, metaState=0x%08x ~ "
"replacement keyCode=%d, replacement metaState=0x%08x.",
keyCode, metaState, *outKeyCode, *outMetaState);
#endif
}
bool KeyCharacterMap::getKey(int32_t keyCode, const Key** outKey) const {
ssize_t index = mKeys.indexOfKey(keyCode);
if (index >= 0) {
@ -584,6 +626,7 @@ sp<KeyCharacterMap> KeyCharacterMap::readFromParcel(Parcel* parcel) {
int32_t metaState = parcel->readInt32();
char16_t character = parcel->readInt32();
int32_t fallbackKeyCode = parcel->readInt32();
int32_t replacementKeyCode = parcel->readInt32();
if (parcel->errorCheck()) {
return NULL;
}
@ -592,6 +635,7 @@ sp<KeyCharacterMap> KeyCharacterMap::readFromParcel(Parcel* parcel) {
behavior->metaState = metaState;
behavior->character = character;
behavior->fallbackKeyCode = fallbackKeyCode;
behavior->replacementKeyCode = replacementKeyCode;
if (lastBehavior) {
lastBehavior->next = behavior;
} else {
@ -624,6 +668,7 @@ void KeyCharacterMap::writeToParcel(Parcel* parcel) const {
parcel->writeInt32(behavior->metaState);
parcel->writeInt32(behavior->character);
parcel->writeInt32(behavior->fallbackKeyCode);
parcel->writeInt32(behavior->replacementKeyCode);
}
parcel->writeInt32(0);
}
@ -655,13 +700,14 @@ KeyCharacterMap::Key::~Key() {
// --- KeyCharacterMap::Behavior ---
KeyCharacterMap::Behavior::Behavior() :
next(NULL), metaState(0), character(0), fallbackKeyCode(0) {
next(NULL), metaState(0), character(0), fallbackKeyCode(0), replacementKeyCode(0) {
}
KeyCharacterMap::Behavior::Behavior(const Behavior& other) :
next(other.next ? new Behavior(*other.next) : NULL),
metaState(other.metaState), character(other.character),
fallbackKeyCode(other.fallbackKeyCode) {
fallbackKeyCode(other.fallbackKeyCode),
replacementKeyCode(other.replacementKeyCode) {
}
@ -923,6 +969,7 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
Behavior behavior;
bool haveCharacter = false;
bool haveFallback = false;
bool haveReplacement = false;
do {
char ch = mTokenizer->peekChar();
@ -939,6 +986,11 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
mTokenizer->getLocation().string());
return BAD_VALUE;
}
if (haveReplacement) {
ALOGE("%s: Cannot combine character literal with replace action.",
mTokenizer->getLocation().string());
return BAD_VALUE;
}
behavior.character = character;
haveCharacter = true;
} else {
@ -949,6 +1001,11 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
mTokenizer->getLocation().string());
return BAD_VALUE;
}
if (haveReplacement) {
ALOGE("%s: Cannot combine 'none' with replace action.",
mTokenizer->getLocation().string());
return BAD_VALUE;
}
haveCharacter = true;
} else if (token == "fallback") {
mTokenizer->skipDelimiters(WHITESPACE);
@ -960,13 +1017,36 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
token.string());
return BAD_VALUE;
}
if (haveFallback) {
ALOGE("%s: Cannot combine multiple fallback key codes.",
if (haveFallback || haveReplacement) {
ALOGE("%s: Cannot combine multiple fallback/replacement key codes.",
mTokenizer->getLocation().string());
return BAD_VALUE;
}
behavior.fallbackKeyCode = keyCode;
haveFallback = true;
} else if (token == "replace") {
mTokenizer->skipDelimiters(WHITESPACE);
token = mTokenizer->nextToken(WHITESPACE);
int32_t keyCode = getKeyCodeByLabel(token.string());
if (!keyCode) {
ALOGE("%s: Invalid key code label for replace, got '%s'.",
mTokenizer->getLocation().string(),
token.string());
return BAD_VALUE;
}
if (haveCharacter) {
ALOGE("%s: Cannot combine character literal with replace action.",
mTokenizer->getLocation().string());
return BAD_VALUE;
}
if (haveFallback || haveReplacement) {
ALOGE("%s: Cannot combine multiple fallback/replacement key codes.",
mTokenizer->getLocation().string());
return BAD_VALUE;
}
behavior.replacementKeyCode = keyCode;
haveReplacement = true;
} else {
ALOGE("%s: Expected a key behavior after ':'.",
mTokenizer->getLocation().string());
@ -1016,8 +1096,10 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
newBehavior->next = key->firstBehavior;
key->firstBehavior = newBehavior;
#if DEBUG_PARSER
ALOGD("Parsed key meta: keyCode=%d, meta=0x%x, char=%d, fallback=%d.", mKeyCode,
newBehavior->metaState, newBehavior->character, newBehavior->fallbackKeyCode);
ALOGD("Parsed key meta: keyCode=%d, meta=0x%x, char=%d, fallback=%d replace=%d.",
mKeyCode,
newBehavior->metaState, newBehavior->character,
newBehavior->fallbackKeyCode, newBehavior->replacementKeyCode);
#endif
break;
}

5
libs/input/Keyboard.cpp
View File

@ -176,6 +176,11 @@ static int32_t setEphemeralMetaState(int32_t mask, bool down, int32_t oldMetaSta
~(mask | AMETA_ALT_ON | AMETA_SHIFT_ON | AMETA_CTRL_ON | AMETA_META_ON);
}
return normalizeMetaState(newMetaState);
}
int32_t normalizeMetaState(int32_t oldMetaState) {
int32_t newMetaState = oldMetaState;
if (newMetaState & (AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON)) {
newMetaState |= AMETA_ALT_ON;
}