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Commit 57306e6b authored by John Spurlock's avatar John Spurlock
Browse files

Reveal hideybars using system gesture. 

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
parent c56b831a

policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

+21 −24
Original line number Diff line number Diff line
@@ -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(),
@@ -4118,9 +4117,8 @@ 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;
@@ -4133,7 +4131,6 @@ public class PhoneWindowManager implements WindowManagerPolicy { 
            updateSystemUiVisibilityLw();

        }

    }

    }



    @Override

    public void screenTurnedOff(int why) {

policy/src/com/android/internal/policy/impl/SystemGestures.java

0 → 100644
+159 −0
Original line number Diff line number Diff line 
/*

 * 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();

    }

}