Add initial API for stylus and mouse buttons.

Added the concept of pointer properties in a MotionEvent.
This is currently used to track the pointer tool type to enable
applications to distinguish finger touches from a stylus.

Button states are also reported to application as part of touch events.

There are no new actions for detecting changes in button states.
The application should instead query the button state from the
MotionEvent and take appropriate action as needed.

A good time to check the button state is on ACTION_DOWN.

As a side-effect, applications that do not support multiple buttons
will treat primary, secondary and tertiary buttons identically
for all touch events.

The back button on the mouse is mapped to KEYCODE_BACK
and the forward button is mapped to KEYCODE_FORWARD.

Added basic plumbing for the secondary mouse button to invoke
the context menu, particularly in lists.

Added clamp and split methods on MotionEvent to take care of
common filtering operations so we don't have them scattered
in multiple places across the framework.

Bug: 4260011
Change-Id: Ie992b4d4e00c8f2e76b961da0a902145b27f6d83

1 files changed, 34 insertions, 11 deletions

diff --git a/libs/ui/Input.cpp b/libs/ui/Input.cpp
index d811dd7ba3c0..1ba38a7ee929 100644
--- a/libs/ui/Input.cpp
+++ b/libs/ui/Input.cpp
@@ -373,6 +373,19 @@ void PointerCoords::copyFrom(const PointerCoords& other) {
 }
 
 
+// --- PointerProperties ---
+
+bool PointerProperties::operator==(const PointerProperties& other) const {
+    return id == other.id
+            && toolType == other.toolType;
+}
+
+void PointerProperties::copyFrom(const PointerProperties& other) {
+    id = other.id;
+    toolType = other.toolType;
+}
+
+
 // --- MotionEvent ---
 
 void MotionEvent::initialize(
@@ -382,6 +395,7 @@ void MotionEvent::initialize(
         int32_t flags,
         int32_t edgeFlags,
         int32_t metaState,
+        int32_t buttonState,
         float xOffset,
         float yOffset,
         float xPrecision,
@@ -389,20 +403,21 @@ void MotionEvent::initialize(
         nsecs_t downTime,
         nsecs_t eventTime,
         size_t pointerCount,
-        const int32_t* pointerIds,
+        const PointerProperties* pointerProperties,
         const PointerCoords* pointerCoords) {
     InputEvent::initialize(deviceId, source);
     mAction = action;
     mFlags = flags;
     mEdgeFlags = edgeFlags;
     mMetaState = metaState;
+    mButtonState = buttonState;
     mXOffset = xOffset;
     mYOffset = yOffset;
     mXPrecision = xPrecision;
     mYPrecision = yPrecision;
     mDownTime = downTime;
-    mPointerIds.clear();
-    mPointerIds.appendArray(pointerIds, pointerCount);
+    mPointerProperties.clear();
+    mPointerProperties.appendArray(pointerProperties, pointerCount);
     mSampleEventTimes.clear();
     mSamplePointerCoords.clear();
     addSample(eventTime, pointerCoords);
@@ -414,12 +429,13 @@ void MotionEvent::copyFrom(const MotionEvent* other, bool keepHistory) {
     mFlags = other->mFlags;
     mEdgeFlags = other->mEdgeFlags;
     mMetaState = other->mMetaState;
+    mButtonState = other->mButtonState;
     mXOffset = other->mXOffset;
     mYOffset = other->mYOffset;
     mXPrecision = other->mXPrecision;
     mYPrecision = other->mYPrecision;
     mDownTime = other->mDownTime;
-    mPointerIds = other->mPointerIds;
+    mPointerProperties = other->mPointerProperties;
 
     if (keepHistory) {
         mSampleEventTimes = other->mSampleEventTimes;
@@ -484,9 +500,9 @@ float MotionEvent::getHistoricalAxisValue(int32_t axis, size_t pointerIndex,
 }
 
 ssize_t MotionEvent::findPointerIndex(int32_t pointerId) const {
-    size_t pointerCount = mPointerIds.size();
+    size_t pointerCount = mPointerProperties.size();
     for (size_t i = 0; i < pointerCount; i++) {
-        if (mPointerIds.itemAt(i) == pointerId) {
+        if (mPointerProperties.itemAt(i).id == pointerId) {
             return i;
         }
     }
@@ -583,21 +599,25 @@ status_t MotionEvent::readFromParcel(Parcel* parcel) {
     mFlags = parcel->readInt32();
     mEdgeFlags = parcel->readInt32();
     mMetaState = parcel->readInt32();
+    mButtonState = parcel->readInt32();
     mXOffset = parcel->readFloat();
     mYOffset = parcel->readFloat();
     mXPrecision = parcel->readFloat();
     mYPrecision = parcel->readFloat();
     mDownTime = parcel->readInt64();
 
-    mPointerIds.clear();
-    mPointerIds.setCapacity(pointerCount);
+    mPointerProperties.clear();
+    mPointerProperties.setCapacity(pointerCount);
     mSampleEventTimes.clear();
     mSampleEventTimes.setCapacity(sampleCount);
     mSamplePointerCoords.clear();
     mSamplePointerCoords.setCapacity(sampleCount * pointerCount);
 
     for (size_t i = 0; i < pointerCount; i++) {
-        mPointerIds.push(parcel->readInt32());
+        mPointerProperties.push();
+        PointerProperties& properties = mPointerProperties.editTop();
+        properties.id = parcel->readInt32();
+        properties.toolType = parcel->readInt32();
     }
 
     while (sampleCount-- > 0) {
@@ -614,7 +634,7 @@ status_t MotionEvent::readFromParcel(Parcel* parcel) {
 }
 
 status_t MotionEvent::writeToParcel(Parcel* parcel) const {
-    size_t pointerCount = mPointerIds.size();
+    size_t pointerCount = mPointerProperties.size();
     size_t sampleCount = mSampleEventTimes.size();
 
     parcel->writeInt32(pointerCount);
@@ -626,6 +646,7 @@ status_t MotionEvent::writeToParcel(Parcel* parcel) const {
     parcel->writeInt32(mFlags);
     parcel->writeInt32(mEdgeFlags);
     parcel->writeInt32(mMetaState);
+    parcel->writeInt32(mButtonState);
     parcel->writeFloat(mXOffset);
     parcel->writeFloat(mYOffset);
     parcel->writeFloat(mXPrecision);
@@ -633,7 +654,9 @@ status_t MotionEvent::writeToParcel(Parcel* parcel) const {
     parcel->writeInt64(mDownTime);
 
     for (size_t i = 0; i < pointerCount; i++) {
-        parcel->writeInt32(mPointerIds.itemAt(i));
+        const PointerProperties& properties = mPointerProperties.itemAt(i);
+        parcel->writeInt32(properties.id);
+        parcel->writeInt32(properties.toolType);
     }
 
     const PointerCoords* pc = mSamplePointerCoords.array();