input系统的mapper机制

class InputDevice {

.....

private:

.....

Vector<InputMapper*> mMappers; //每个inputdevice都有一个自己的私有mMappers类型的数据

.....

}

增加自身mapper的函数是

void InputDevice::addMapper(InputMapper* mapper) {

mMappers.add(mapper);

}

InputDevice* InputReader::createDeviceLocked(int32_t deviceId, int32_t controllerNumber,

const InputDeviceIdentifier& identifier, uint32_t classes) {

......

if (classes & INPUT_DEVICE_CLASS_SWITCH) {

ALOGE("lisa-addMapper 1");

device->addMapper(new SwitchInputMapper(device)); //加入相应的mapper

}

if (classes & INPUT_DEVICE_CLASS_VIBRATOR) {

ALOGE("lisa-addMapper 2");

device->addMapper(new VibratorInputMapper(device));

}

......

}

上面的函数被void InputReader::addDeviceLocked(nsecs_t when, int32_t deviceId) {

InputDevice* device = createDeviceLocked(deviceId, controllerNumber, identifier, classes);

}调用

void InputReader::processEventsLocked(const RawEvent* rawEvents, size_t count) {

......

switch (rawEvent->type) {

case EventHubInterface::DEVICE_ADDED:

addDeviceLocked(rawEvent->when, rawEvent->deviceId); //每次有inputdecice加入的时候

break;

}

所以在void InputDevice::process(const RawEvent* rawEvents, size_t count) {

for (size_t i = 0; i < numMappers; i++) { //这里的mapper数量会变化，比如touchscreen是2，按键是1，因为两个是不同的inputdevice

InputMapper* mapper = mMappers[i];

mapper->process(rawEvent);

}

}

log如下：E/InputReader( 1247): lisa-deviceIndex=3

E/InputReader( 1247): lisa-InputDevice=a3d3ffc870334637db1e8bbfb999c8c212cbcbc9

E/InputReader( 1247): lisa-InputDevice::process

E/InputReader( 1247): lisa-numMappers=2

E/InputReader( 1247): lisa-KeyboardInputMapper::process

E/InputReader( 1247): lisa-MultiTouchInputMapper::process

E/InputReader( 1247): lisa-TouchInputMapper::process

E/InputReader( 1247): lisa-numMappers=2

E/InputReader( 1247): lisa-KeyboardInputMapper::process

E/InputReader( 1247): lisa-MultiTouchInputMapper::process

上面是touchscreen的log

E/InputReader( 1247): lisa-deviceIndex=1

E/InputReader( 1247): lisa-InputDevice=fb60d4f4370f5dbe8267b63d38dea852987571ab

E/InputReader( 1247): lisa-InputDevice::process

E/InputReader( 1247): lisa-numMappers=1

上面的是keyboard的log

这也解释了如何调用device自身的mapper去process

01-01 00:03:17.299 1204 1292 E InputReader: lisa-addMapper 3

01-01 00:03:17.299 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.299 1204 1292 I InputReader: Device added: id=-1, name='Virtual', sources=0x00000301

01-01 00:03:17.299 1204 1292 E InputReader: matt-rawEvents; count=6

01-01 00:03:17.299 1204 1292 E InputReader: lisa-addMapper 3

01-01 00:03:17.299 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.299 1204 1292 I InputReader: Device added: id=5, name='gpio-keys', sources=0x00000101

01-01 00:03:17.299 1204 1292 E InputReader: matt-rawEvents; count=5

01-01 00:03:17.299 1204 1292 E InputReader: lisa-addMapper 5

01-01 00:03:17.299 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.299 1204 1292 I InputReader: Touch device 'input_mt_wrapper' could not query the properties of its associated display.

01-01 00:03:17.299 1204 1292 I InputReader: Device added: id=4, name='input_mt_wrapper', sources=0x00002002

01-01 00:03:17.299 1204 1292 E InputReader: matt-rawEvents; count=4

01-01 00:03:17.299 1204 1292 E InputReader: lisa-addMapper 3 //device->addMapper(new KeyboardInputMapper(device, keyboardSource, keyboardType));加了一个

01-01 00:03:17.299 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.299 1204 1292 E InputReader: lisa-addMapper 5 // device->addMapper(new MultiTouchInputMapper(device));再加一个

01-01 00:03:17.299 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.299 1204 1292 I InputReader: Touch device 'ft5x06_ts' could not query the properties of its associated display. // 所以touch有两个mapper

01-01 00:03:17.299 1204 1292 I InputReader: Device added: id=3, name='ft5x06_ts', sources=0x00001103

01-01 00:03:17.299 1204 1292 E InputReader: matt-rawEvents; count=3

01-01 00:03:17.299 1204 1292 E InputReader: lisa-addMapper 4

01-01 00:03:17.299 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.309 1204 1292 I InputReader: Device added: id=2, name='hbtp_vm', sources=0x00002002

01-01 00:03:17.309 1204 1292 E InputReader: matt-rawEvents; count=2

01-01 00:03:17.309 1204 1292 E InputReader: lisa-addMapper 3

01-01 00:03:17.309 1204 1292 E InputReader: lisa-mMappers.add

01-01 00:03:17.309 1204 1292 I InputReader: Device added: id=1, name='qpnp_pon', sources=0x00000101