/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.systemui.statusbar.policy;
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import android.animation.ObjectAnimator;
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import android.content.res.Resources;
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import android.graphics.Canvas;
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import android.os.SystemClock;
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import android.util.Slog;
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import android.view.MotionEvent;
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import android.view.Surface;
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import com.android.systemui.Dependency;
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import com.android.systemui.R;
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import com.android.systemui.statusbar.NavigationBarController;
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import com.android.systemui.statusbar.phone.NavigationBarView;
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/**
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* The "dead zone" consumes unintentional taps along the top edge of the navigation bar.
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* When users are typing quickly on an IME they may attempt to hit the space bar, overshoot, and
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* accidentally hit the home button. The DeadZone expands temporarily after each tap in the UI
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* outside the navigation bar (since this is when accidental taps are more likely), then contracts
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* back over time (since a later tap might be intended for the top of the bar).
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*/
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public class DeadZone {
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public static final String TAG = "DeadZone";
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public static final boolean DEBUG = false;
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public static final int HORIZONTAL = 0; // Consume taps along the top edge.
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public static final int VERTICAL = 1; // Consume taps along the left edge.
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private static final boolean CHATTY = true; // print to logcat when we eat a click
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private final NavigationBarController mNavBarController;
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private final NavigationBarView mNavigationBarView;
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private boolean mShouldFlash;
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private float mFlashFrac = 0f;
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private int mSizeMax;
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private int mSizeMin;
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// Upon activity elsewhere in the UI, the dead zone will hold steady for
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// mHold ms, then move back over the course of mDecay ms
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private int mHold, mDecay;
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private boolean mVertical;
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private long mLastPokeTime;
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private int mDisplayRotation;
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private final int mDisplayId;
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private final Runnable mDebugFlash = new Runnable() {
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@Override
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public void run() {
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ObjectAnimator.ofFloat(DeadZone.this, "flash", 1f, 0f).setDuration(150).start();
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}
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};
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public DeadZone(NavigationBarView view) {
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mNavigationBarView = view;
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mNavBarController = Dependency.get(NavigationBarController.class);
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mDisplayId = view.getContext().getDisplayId();
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onConfigurationChanged(HORIZONTAL);
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}
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static float lerp(float a, float b, float f) {
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return (b - a) * f + a;
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}
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private float getSize(long now) {
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if (mSizeMax == 0)
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return 0;
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long dt = (now - mLastPokeTime);
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if (dt > mHold + mDecay)
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return mSizeMin;
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if (dt < mHold)
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return mSizeMax;
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return (int) lerp(mSizeMax, mSizeMin, (float) (dt - mHold) / mDecay);
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}
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public void setFlashOnTouchCapture(boolean dbg) {
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mShouldFlash = dbg;
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mFlashFrac = 0f;
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mNavigationBarView.postInvalidate();
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}
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public void onConfigurationChanged(int rotation) {
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mDisplayRotation = rotation;
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final Resources res = mNavigationBarView.getResources();
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mHold = res.getInteger(R.integer.navigation_bar_deadzone_hold);
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mDecay = res.getInteger(R.integer.navigation_bar_deadzone_decay);
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mSizeMin = res.getDimensionPixelSize(R.dimen.navigation_bar_deadzone_size);
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mSizeMax = res.getDimensionPixelSize(R.dimen.navigation_bar_deadzone_size_max);
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int index = res.getInteger(R.integer.navigation_bar_deadzone_orientation);
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mVertical = (index == VERTICAL);
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if (DEBUG) {
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Slog.v(TAG, this + " size=[" + mSizeMin + "-" + mSizeMax + "] hold=" + mHold
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+ (mVertical ? " vertical" : " horizontal"));
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}
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setFlashOnTouchCapture(res.getBoolean(R.bool.config_dead_zone_flash));
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}
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// I made you a touch event...
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public boolean onTouchEvent(MotionEvent event) {
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if (DEBUG) {
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Slog.v(TAG, this + " onTouch: " + MotionEvent.actionToString(event.getAction()));
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}
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// Don't consume events for high precision pointing devices. For this purpose a stylus is
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// considered low precision (like a finger), so its events may be consumed.
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if (event.getToolType(0) == MotionEvent.TOOL_TYPE_MOUSE) {
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return false;
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}
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final int action = event.getAction();
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if (action == MotionEvent.ACTION_OUTSIDE) {
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poke(event);
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return true;
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} else if (action == MotionEvent.ACTION_DOWN) {
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if (DEBUG) {
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Slog.v(TAG, this + " ACTION_DOWN: " + event.getX() + "," + event.getY());
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}
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mNavBarController.touchAutoDim(mDisplayId);
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int size = (int) getSize(event.getEventTime());
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// In the vertical orientation consume taps along the left edge.
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// In horizontal orientation consume taps along the top edge.
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final boolean consumeEvent;
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if (mVertical) {
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if (mDisplayRotation == Surface.ROTATION_270) {
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consumeEvent = event.getX() > mNavigationBarView.getWidth() - size;
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} else {
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consumeEvent = event.getX() < size;
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}
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} else {
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consumeEvent = event.getY() < size;
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}
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if (consumeEvent) {
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if (CHATTY) {
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Slog.v(TAG, "consuming errant click: (" + event.getX() + "," + event.getY() + ")");
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}
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if (mShouldFlash) {
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mNavigationBarView.post(mDebugFlash);
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mNavigationBarView.postInvalidate();
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}
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return true; // ...but I eated it
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}
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}
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return false;
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}
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private void poke(MotionEvent event) {
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mLastPokeTime = event.getEventTime();
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if (DEBUG)
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Slog.v(TAG, "poked! size=" + getSize(mLastPokeTime));
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if (mShouldFlash) mNavigationBarView.postInvalidate();
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}
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public void setFlash(float f) {
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mFlashFrac = f;
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mNavigationBarView.postInvalidate();
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}
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public float getFlash() {
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return mFlashFrac;
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}
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public void onDraw(Canvas can) {
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if (!mShouldFlash || mFlashFrac <= 0f) {
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return;
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}
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final int size = (int) getSize(SystemClock.uptimeMillis());
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if (mVertical) {
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if (mDisplayRotation == Surface.ROTATION_270) {
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can.clipRect(can.getWidth() - size, 0, can.getWidth(), can.getHeight());
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} else {
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can.clipRect(0, 0, size, can.getHeight());
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}
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} else {
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can.clipRect(0, 0, can.getWidth(), size);
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}
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final float frac = DEBUG ? (mFlashFrac - 0.5f) + 0.5f : mFlashFrac;
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can.drawARGB((int) (frac * 0xFF), 0xDD, 0xEE, 0xAA);
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if (DEBUG && size > mSizeMin)
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// crazy aggressive redrawing here, for debugging only
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mNavigationBarView.postInvalidateDelayed(100);
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}
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}
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