From 46b9ac0ae2162309774a7478cd9d4e578747bfc2 Mon Sep 17 00:00:00 2001
From: Jeff Brown <jeffbrown@google.com>
Date: Thu, 22 Apr 2010 18:58:52 -0700
Subject: 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
---
 .../android/internal/view/BaseInputHandler.java    | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 core/java/com/android/internal/view/BaseInputHandler.java

(limited to 'core/java/com')

diff --git a/core/java/com/android/internal/view/BaseInputHandler.java b/core/java/com/android/internal/view/BaseInputHandler.java
new file mode 100644
index 0000000..6fe5063
--- /dev/null
+++ b/core/java/com/android/internal/view/BaseInputHandler.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+package com.android.internal.view;
+
+import android.view.InputHandler;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+
+/**
+ * Base do-nothing implementation of an input handler.
+ * @hide
+ */
+public abstract class BaseInputHandler implements InputHandler {
+    public void handleKey(KeyEvent event, Runnable finishedCallback) {
+        finishedCallback.run();
+    }
+    
+    public void handleTouch(MotionEvent event, Runnable finishedCallback) {
+        finishedCallback.run();
+    }
+    
+    public void handleTrackball(MotionEvent event, Runnable finishedCallback) {
+        finishedCallback.run();
+    }
+}
-- 
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