Native input dispatch rewrite work in progress.

The old dispatch mechanism has been left in place and continues to
be used by default for now.  To enable native input dispatch,
edit the ENABLE_NATIVE_DISPATCH constant in WindowManagerPolicy.

Includes part of the new input event NDK API.  Some details TBD.

To wire up input dispatch, as the ViewRoot adds a window to the
window session it receives an InputChannel object as an output
argument.  The InputChannel encapsulates the file descriptors for a
shared memory region and two pipe end-points.  The ViewRoot then
provides the InputChannel to the InputQueue.  Behind the
scenes, InputQueue simply attaches handlers to the native PollLoop object
that underlies the MessageQueue.  This way MessageQueue doesn't need
to know anything about input dispatch per-se, it just exposes (in native
code) a PollLoop that other components can use to monitor file descriptor
state changes.

There can be zero or more targets for any given input event.  Each
input target is specified by its input channel and some parameters
including flags, an X/Y coordinate offset, and the dispatch timeout.
An input target can request either synchronous dispatch (for foreground apps)
or asynchronous dispatch (fire-and-forget for wallpapers and "outside"
targets).  Currently, finding the appropriate input targets for an event
requires a call back into the WindowManagerServer from native code.
In the future this will be refactored to avoid most of these callbacks
except as required to handle pending focus transitions.

End-to-end event dispatch mostly works!

To do: event injection, rate limiting, ANRs, testing, optimization, etc.

Change-Id: I8c36b2b9e0a2d27392040ecda0f51b636456de25

1 files changed, 12 insertions, 11 deletions

diff --git a/core/java/android/view/KeyEvent.java b/core/java/android/view/KeyEvent.java
index 9aa16b53216d..ae9746e96373 100755
--- a/core/java/android/view/KeyEvent.java
+++ b/core/java/android/view/KeyEvent.java
@@ -127,6 +127,7 @@ public class KeyEvent implements Parcelable {
 
     // NOTE: If you add a new keycode here you must also add it to:
     //  isSystem()
+    //  native/include/android/keycodes.h
     //  frameworks/base/include/ui/KeycodeLabels.h
     //  tools/puppet_master/PuppetMaster/nav_keys.py
     //  frameworks/base/core/res/res/values/attrs.xml
@@ -162,7 +163,7 @@ public class KeyEvent implements Parcelable {
      * key code is not {#link {@link #KEYCODE_UNKNOWN} then the
      * {#link {@link #getRepeatCount()} method returns the number of times
      * the given key code should be executed.
-     * Otherwise, if the key code {@link #KEYCODE_UNKNOWN}, then
+     * Otherwise, if the key code is {@link #KEYCODE_UNKNOWN}, then
      * this is a sequence of characters as returned by {@link #getCharacters}.
      */
     public static final int ACTION_MULTIPLE         = 2;
@@ -330,7 +331,7 @@ public class KeyEvent implements Parcelable {
     private int mMetaState;
     private int mAction;
     private int mKeyCode;
-    private int mScancode;
+    private int mScanCode;
     private int mRepeatCount;
     private int mDeviceId;
     private int mFlags;
@@ -480,7 +481,7 @@ public class KeyEvent implements Parcelable {
         mRepeatCount = repeat;
         mMetaState = metaState;
         mDeviceId = device;
-        mScancode = scancode;
+        mScanCode = scancode;
     }
 
     /**
@@ -510,7 +511,7 @@ public class KeyEvent implements Parcelable {
         mRepeatCount = repeat;
         mMetaState = metaState;
         mDeviceId = device;
-        mScancode = scancode;
+        mScanCode = scancode;
         mFlags = flags;
     }
 
@@ -547,7 +548,7 @@ public class KeyEvent implements Parcelable {
         mRepeatCount = origEvent.mRepeatCount;
         mMetaState = origEvent.mMetaState;
         mDeviceId = origEvent.mDeviceId;
-        mScancode = origEvent.mScancode;
+        mScanCode = origEvent.mScanCode;
         mFlags = origEvent.mFlags;
         mCharacters = origEvent.mCharacters;
     }
@@ -572,7 +573,7 @@ public class KeyEvent implements Parcelable {
         mRepeatCount = newRepeat;
         mMetaState = origEvent.mMetaState;
         mDeviceId = origEvent.mDeviceId;
-        mScancode = origEvent.mScancode;
+        mScanCode = origEvent.mScanCode;
         mFlags = origEvent.mFlags;
         mCharacters = origEvent.mCharacters;
     }
@@ -625,7 +626,7 @@ public class KeyEvent implements Parcelable {
         mRepeatCount = origEvent.mRepeatCount;
         mMetaState = origEvent.mMetaState;
         mDeviceId = origEvent.mDeviceId;
-        mScancode = origEvent.mScancode;
+        mScanCode = origEvent.mScanCode;
         mFlags = origEvent.mFlags;
         // Don't copy mCharacters, since one way or the other we'll lose it
         // when changing the action.
@@ -859,7 +860,7 @@ public class KeyEvent implements Parcelable {
      * Mostly this is here for debugging purposes.
      */
     public final int getScanCode() {
-        return mScancode;
+        return mScanCode;
     }
 
     /**
@@ -1183,7 +1184,7 @@ public class KeyEvent implements Parcelable {
     public String toString() {
         return "KeyEvent{action=" + mAction + " code=" + mKeyCode
             + " repeat=" + mRepeatCount
-            + " meta=" + mMetaState + " scancode=" + mScancode
+            + " meta=" + mMetaState + " scancode=" + mScanCode
             + " mFlags=" + mFlags + "}";
     }
 
@@ -1208,7 +1209,7 @@ public class KeyEvent implements Parcelable {
         out.writeInt(mRepeatCount);
         out.writeInt(mMetaState);
         out.writeInt(mDeviceId);
-        out.writeInt(mScancode);
+        out.writeInt(mScanCode);
         out.writeInt(mFlags);
         out.writeLong(mDownTime);
         out.writeLong(mEventTime);
@@ -1220,7 +1221,7 @@ public class KeyEvent implements Parcelable {
         mRepeatCount = in.readInt();
         mMetaState = in.readInt();
         mDeviceId = in.readInt();
-        mScancode = in.readInt();
+        mScanCode = in.readInt();
         mFlags = in.readInt();
         mDownTime = in.readLong();
         mEventTime = in.readLong();