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Reveal hideybars using system gesture.

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Monitor input events using a dedicated input channel created by
window manager.

This new input event receiver could be used in the future for other
system-wide gestures that do not consume events.

Change-Id: Ib1be2fee0015332279fcf10f5b669fffd61acdcd
This commit is contained in:
John Spurlock
2013-04-22 09:48:49 -04:00
parent c56b831a1f
commit 57306e6b79
2 changed files with 180 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
View File

@@ -152,8 +152,6 @@ public class PhoneWindowManager implements WindowManagerPolicy {
static public final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
static public final String SYSTEM_DIALOG_REASON_ASSIST = "assist";
static public final String ACTION_HIDEYBARS = "android.intent.action.HIDEYBARS";
/**
* These are the system UI flags that, when changing, can cause the layout
* of the screen to change.
@@ -559,12 +557,8 @@ public class PhoneWindowManager implements WindowManagerPolicy {
private static final int HIDEYBARS_HIDING = 2;
private int mHideybars;
BroadcastReceiver mHideybarsReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
receivedHideybars(intent.getAction());
}
};
private InputChannel mSystemGestureInputChannel;
private InputEventReceiver mSystemGestures;
IStatusBarService getStatusBarService() {
synchronized (mServiceAquireLock) {
@@ -918,10 +912,15 @@ public class PhoneWindowManager implements WindowManagerPolicy {
filter = new IntentFilter(Intent.ACTION_USER_SWITCHED);
context.registerReceiver(mMultiuserReceiver, filter);
// register for hideybars
filter = new IntentFilter();
filter.addAction(ACTION_HIDEYBARS);
context.registerReceiver(mHideybarsReceiver, filter);
// monitor for system gestures
mSystemGestureInputChannel = mWindowManagerFuncs.monitorInput("SystemGestures");
mSystemGestures = new SystemGestures(mSystemGestureInputChannel,
mHandler.getLooper(), context,
new SystemGestures.Callbacks() {
@Override
public void onSwipeFromTop() {
showHideybars();
}});
mVibrator = (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
mLongPressVibePattern = getLongIntArray(mContext.getResources(),
@@ -4118,20 +4117,18 @@ public class PhoneWindowManager implements WindowManagerPolicy {
}
};
private void receivedHideybars(String action) {
private void showHideybars() {
synchronized(mLock) {
if (action.equals(ACTION_HIDEYBARS)) {
if (mHideybars == HIDEYBARS_SHOWING) {
if (DEBUG) Slog.d(TAG, "Not showing hideybars, already shown");
return;
}
if (mStatusBar.isDisplayedLw()) {
if (DEBUG) Slog.d(TAG, "Not showing hideybars, status bar already visible");
return;
}
mHideybars = HIDEYBARS_SHOWING;
updateSystemUiVisibilityLw();
if (mHideybars == HIDEYBARS_SHOWING) {
if (DEBUG) Slog.d(TAG, "Not showing hideybars, already shown");
return;
}
if (mStatusBar.isDisplayedLw()) {
if (DEBUG) Slog.d(TAG, "Not showing hideybars, status bar already visible");
return;
}
mHideybars = HIDEYBARS_SHOWING;
updateSystemUiVisibilityLw();
}
}

159
policy/src/com/android/internal/policy/impl/SystemGestures.java Normal file
View File

@@ -0,0 +1,159 @@
/*
* Copyright (C) 2013 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.policy.impl;
import android.content.Context;
import android.os.Looper;
import android.util.Slog;
import android.view.InputChannel;
import android.view.InputDevice;
import android.view.InputEvent;
import android.view.InputEventReceiver;
import android.view.MotionEvent;
/*
* Listens for system-wide input gestures, firing callbacks when detected.
* @hide
*/
public class SystemGestures extends InputEventReceiver {
private static final String TAG = "SystemGestures";
private static final boolean DEBUG = false;
private static final long SWIPE_TIMEOUT_MS = 500;
private static final int MAX_TRACKED_POINTERS = 32; // max per input system
private static final int UNTRACKED_POINTER = -1;
private final int mSwipeStartThreshold;
private final int mSwipeEndThreshold;
private final Callbacks mCallbacks;
private final int[] mDownPointerId = new int[MAX_TRACKED_POINTERS];
private final float[] mDownY = new float[MAX_TRACKED_POINTERS];
private final long[] mDownTime = new long[MAX_TRACKED_POINTERS];
private int mDownPointers;
private boolean mSwipeFromTopFireable;
public SystemGestures(InputChannel inputChannel, Looper looper,
Context context, Callbacks callbacks) {
super(inputChannel, looper);
mCallbacks = checkNull("callbacks", callbacks);
mSwipeStartThreshold = checkNull("context", context).getResources()
.getDimensionPixelSize(com.android.internal.R.dimen.status_bar_height);
mSwipeEndThreshold = mSwipeStartThreshold * 2;
}
private static <T> T checkNull(String name, T arg) {
if (arg == null) {
throw new IllegalArgumentException(name + " must not be null");
}
return arg;
}
@Override
public void onInputEvent(InputEvent event) {
if (event instanceof MotionEvent && event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {
onPointerMotionEvent((MotionEvent) event);
}
finishInputEvent(event, false /*handled*/);
}
private void onPointerMotionEvent(MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mSwipeFromTopFireable = true;
mDownPointers = 0;
captureDown(event, 0);
break;
case MotionEvent.ACTION_POINTER_DOWN:
captureDown(event, event.getActionIndex());
break;
case MotionEvent.ACTION_MOVE:
if (mSwipeFromTopFireable && detectSwipeFromTop(event)) {
mSwipeFromTopFireable = false;
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromTop");
mCallbacks.onSwipeFromTop();
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mSwipeFromTopFireable = false;
break;
default:
if (DEBUG) Slog.d(TAG, "Ignoring " + event);
}
}
private void captureDown(MotionEvent event, int pointerIndex) {
final int pointerId = event.getPointerId(pointerIndex);
final int i = findIndex(pointerId);
if (DEBUG) Slog.d(TAG, "pointer " + pointerId +
" down pointerIndex=" + pointerIndex + " trackingIndex=" + i);
if (i != UNTRACKED_POINTER) {
mDownY[i] = event.getY(pointerIndex);
mDownTime[i] = event.getEventTime();
if (DEBUG) Slog.d(TAG, "pointer " + pointerId + " down y=" + mDownY[i]);
}
}
private int findIndex(int pointerId) {
for (int i = 0; i < mDownPointers; i++) {
if (mDownPointerId[i] == pointerId) {
return i;
}
}
if (mDownPointers == MAX_TRACKED_POINTERS || pointerId == MotionEvent.INVALID_POINTER_ID) {
return UNTRACKED_POINTER;
}
mDownPointerId[mDownPointers++] = pointerId;
return mDownPointers - 1;
}
private boolean detectSwipeFromTop(MotionEvent move) {
final int historySize = move.getHistorySize();
final int pointerCount = move.getPointerCount();
for (int p = 0; p < pointerCount; p++) {
final int pointerId = move.getPointerId(p);
final int i = findIndex(pointerId);
if (i != UNTRACKED_POINTER) {
for (int h = 0; h < historySize; h++) {
final long time = move.getHistoricalEventTime(h);
final float y = move.getHistoricalY(p, h);
if (detectSwipeFromTop(i, time, y)) {
return true;
}
}
if (detectSwipeFromTop(i, move.getEventTime(), move.getY(p))) {
return true;
}
}
}
return false;
}
private boolean detectSwipeFromTop(int i, long time, float y) {
final float fromY = mDownY[i];
final long elapsed = time - mDownTime[i];
if (DEBUG) Slog.d(TAG, "pointer " + mDownPointerId[i]
+ " moved from.y=" + fromY + " to.y=" + y + " in " + elapsed);
return fromY <= mSwipeStartThreshold
&& y > fromY + mSwipeEndThreshold
&& elapsed < SWIPE_TIMEOUT_MS;
}
interface Callbacks {
void onSwipeFromTop();
}
}