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/*
* Copyright (C) 2012 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.systemui.statusbar.policy;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.util.Slog;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.View;
import com.android.systemui.R;
import com.android.systemui.SysUiServiceProvider;
import com.android.systemui.statusbar.phone.StatusBar;
/**
* The "dead zone" consumes unintentional taps along the top edge of the navigation bar.
* When users are typing quickly on an IME they may attempt to hit the space bar, overshoot, and
* accidentally hit the home button. The DeadZone expands temporarily after each tap in the UI
* outside the navigation bar (since this is when accidental taps are more likely), then contracts
* back over time (since a later tap might be intended for the top of the bar).
*/
public class DeadZone extends View {
public static final String TAG = "DeadZone";
public static final boolean DEBUG = false;
public static final int HORIZONTAL = 0; // Consume taps along the top edge.
public static final int VERTICAL = 1; // Consume taps along the left edge.
private static final boolean CHATTY = true; // print to logcat when we eat a click
private final StatusBar mStatusBar;
private boolean mShouldFlash;
private float mFlashFrac = 0f;
private int mSizeMax;
private int mSizeMin;
// Upon activity elsewhere in the UI, the dead zone will hold steady for
// mHold ms, then move back over the course of mDecay ms
private int mHold, mDecay;
private boolean mVertical;
private long mLastPokeTime;
private int mDisplayRotation;
private final Runnable mDebugFlash = new Runnable() {
@Override
public void run() {
ObjectAnimator.ofFloat(DeadZone.this, "flash", 1f, 0f).setDuration(150).start();
}
};
public DeadZone(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DeadZone(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DeadZone,
defStyle, 0);
mHold = a.getInteger(R.styleable.DeadZone_holdTime, 0);
mDecay = a.getInteger(R.styleable.DeadZone_decayTime, 0);
mSizeMin = a.getDimensionPixelSize(R.styleable.DeadZone_minSize, 0);
mSizeMax = a.getDimensionPixelSize(R.styleable.DeadZone_maxSize, 0);
int index = a.getInt(R.styleable.DeadZone_orientation, -1);
mVertical = (index == VERTICAL);
if (DEBUG)
Slog.v(TAG, this + " size=[" + mSizeMin + "-" + mSizeMax + "] hold=" + mHold
+ (mVertical ? " vertical" : " horizontal"));
setFlashOnTouchCapture(context.getResources().getBoolean(R.bool.config_dead_zone_flash));
mStatusBar = SysUiServiceProvider.getComponent(context, StatusBar.class);
}
static float lerp(float a, float b, float f) {
return (b - a) * f + a;
}
private float getSize(long now) {
if (mSizeMax == 0)
return 0;
long dt = (now - mLastPokeTime);
if (dt > mHold + mDecay)
return mSizeMin;
if (dt < mHold)
return mSizeMax;
return (int) lerp(mSizeMax, mSizeMin, (float) (dt - mHold) / mDecay);
}
public void setFlashOnTouchCapture(boolean dbg) {
mShouldFlash = dbg;
mFlashFrac = 0f;
postInvalidate();
}
// I made you a touch event...
@Override
public boolean onTouchEvent(MotionEvent event) {
if (DEBUG) {
Slog.v(TAG, this + " onTouch: " + MotionEvent.actionToString(event.getAction()));
}
// Don't consume events for high precision pointing devices. For this purpose a stylus is
// considered low precision (like a finger), so its events may be consumed.
if (event.getToolType(0) == MotionEvent.TOOL_TYPE_MOUSE) {
return false;
}
final int action = event.getAction();
if (action == MotionEvent.ACTION_OUTSIDE) {
poke(event);
return true;
} else if (action == MotionEvent.ACTION_DOWN) {
if (DEBUG) {
Slog.v(TAG, this + " ACTION_DOWN: " + event.getX() + "," + event.getY());
}
if (mStatusBar != null) mStatusBar.touchAutoDim();
int size = (int) getSize(event.getEventTime());
// In the vertical orientation consume taps along the left edge.
// In horizontal orientation consume taps along the top edge.
final boolean consumeEvent;
if (mVertical) {
if (mDisplayRotation == Surface.ROTATION_270) {
consumeEvent = event.getX() > getWidth() - size;
} else {
consumeEvent = event.getX() < size;
}
} else {
consumeEvent = event.getY() < size;
}
if (consumeEvent) {
if (CHATTY) {
Slog.v(TAG, "consuming errant click: (" + event.getX() + "," + event.getY() + ")");
}
if (mShouldFlash) {
post(mDebugFlash);
postInvalidate();
}
return true; // ...but I eated it
}
}
return false;
}
private void poke(MotionEvent event) {
mLastPokeTime = event.getEventTime();
if (DEBUG)
Slog.v(TAG, "poked! size=" + getSize(mLastPokeTime));
if (mShouldFlash) postInvalidate();
}
public void setFlash(float f) {
mFlashFrac = f;
postInvalidate();
}
public float getFlash() {
return mFlashFrac;
}
@Override
public void onDraw(Canvas can) {
if (!mShouldFlash || mFlashFrac <= 0f) {
return;
}
final int size = (int) getSize(SystemClock.uptimeMillis());
if (mVertical) {
if (mDisplayRotation == Surface.ROTATION_270) {
can.clipRect(can.getWidth() - size, 0, can.getWidth(), can.getHeight());
} else {
can.clipRect(0, 0, size, can.getHeight());
}
} else {
can.clipRect(0, 0, can.getWidth(), size);
}
final float frac = DEBUG ? (mFlashFrac - 0.5f) + 0.5f : mFlashFrac;
can.drawARGB((int) (frac * 0xFF), 0xDD, 0xEE, 0xAA);
if (DEBUG && size > mSizeMin)
// crazy aggressive redrawing here, for debugging only
postInvalidateDelayed(100);
}
public void setDisplayRotation(int rotation) {
mDisplayRotation = rotation;
}
}
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