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/*
* Copyright (C) 2016 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.launcher3.keyboard;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.RectEvaluator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.Property;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import com.android.launcher3.R;
/**
* A helper class to draw background of a focused view.
*/
public abstract class FocusIndicatorHelper implements
OnFocusChangeListener, AnimatorUpdateListener {
private static final float MIN_VISIBLE_ALPHA = 0.2f;
private static final long ANIM_DURATION = 150;
public static final Property<FocusIndicatorHelper, Float> ALPHA =
new Property<FocusIndicatorHelper, Float>(Float.TYPE, "alpha") {
@Override
public void set(FocusIndicatorHelper object, Float value) {
object.setAlpha(value);
}
@Override
public Float get(FocusIndicatorHelper object) {
return object.mAlpha;
}
};
public static final Property<FocusIndicatorHelper, Float> SHIFT =
new Property<FocusIndicatorHelper, Float>(
Float.TYPE, "shift") {
@Override
public void set(FocusIndicatorHelper object, Float value) {
object.mShift = value;
}
@Override
public Float get(FocusIndicatorHelper object) {
return object.mShift;
}
};
private static final RectEvaluator RECT_EVALUATOR = new RectEvaluator(new Rect());
private static final Rect sTempRect1 = new Rect();
private static final Rect sTempRect2 = new Rect();
private final View mContainer;
private final Paint mPaint;
private final int mMaxAlpha;
private final Rect mDirtyRect = new Rect();
private boolean mIsDirty = false;
private View mLastFocusedView;
private View mCurrentView;
private View mTargetView;
/**
* The fraction indicating the position of the focusRect between {@link #mCurrentView}
* & {@link #mTargetView}
*/
private float mShift;
private ObjectAnimator mCurrentAnimation;
private float mAlpha;
public FocusIndicatorHelper(View container) {
mContainer = container;
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
int color = container.getResources().getColor(R.color.focused_background);
mMaxAlpha = Color.alpha(color);
mPaint.setColor(0xFF000000 | color);
setAlpha(0);
mShift = 0;
}
protected void setAlpha(float alpha) {
mAlpha = alpha;
mPaint.setAlpha((int) (mAlpha * mMaxAlpha));
}
@Override
public void onAnimationUpdate(ValueAnimator animation) {
invalidateDirty();
}
protected void invalidateDirty() {
if (mIsDirty) {
mContainer.invalidate(mDirtyRect);
mIsDirty = false;
}
Rect newRect = getDrawRect();
if (newRect != null) {
mContainer.invalidate(newRect);
}
}
public void draw(Canvas c) {
if (mAlpha > 0) {
Rect newRect = getDrawRect();
if (newRect != null) {
mDirtyRect.set(newRect);
c.drawRect(mDirtyRect, mPaint);
mIsDirty = true;
}
}
}
private Rect getDrawRect() {
if (mCurrentView != null && mCurrentView.isAttachedToWindow()) {
viewToRect(mCurrentView, sTempRect1);
if (mShift > 0 && mTargetView != null) {
viewToRect(mTargetView, sTempRect2);
return RECT_EVALUATOR.evaluate(mShift, sTempRect1, sTempRect2);
} else {
return sTempRect1;
}
}
return null;
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
endCurrentAnimation();
if (mAlpha > MIN_VISIBLE_ALPHA) {
mTargetView = v;
mCurrentAnimation = ObjectAnimator.ofPropertyValuesHolder(this,
PropertyValuesHolder.ofFloat(ALPHA, 1),
PropertyValuesHolder.ofFloat(SHIFT, 1));
mCurrentAnimation.addListener(new ViewSetListener(v, true));
} else {
setCurrentView(v);
mCurrentAnimation = ObjectAnimator.ofPropertyValuesHolder(this,
PropertyValuesHolder.ofFloat(ALPHA, 1));
}
mLastFocusedView = v;
} else {
if (mLastFocusedView == v) {
mLastFocusedView = null;
endCurrentAnimation();
mCurrentAnimation = ObjectAnimator.ofPropertyValuesHolder(this,
PropertyValuesHolder.ofFloat(ALPHA, 0));
mCurrentAnimation.addListener(new ViewSetListener(null, false));
}
}
// invalidate once
invalidateDirty();
mLastFocusedView = hasFocus ? v : null;
if (mCurrentAnimation != null) {
mCurrentAnimation.addUpdateListener(this);
mCurrentAnimation.setDuration(ANIM_DURATION).start();
}
}
protected void endCurrentAnimation() {
if (mCurrentAnimation != null) {
mCurrentAnimation.cancel();
mCurrentAnimation = null;
}
}
protected void setCurrentView(View v) {
mCurrentView = v;
mShift = 0;
mTargetView = null;
}
/**
* Gets the position of {@param v} relative to {@link #mContainer}.
*/
public abstract void viewToRect(View v, Rect outRect);
private class ViewSetListener extends AnimatorListenerAdapter {
private final View mViewToSet;
private final boolean mCallOnCancel;
private boolean mCalled = false;
public ViewSetListener(View v, boolean callOnCancel) {
mViewToSet = v;
mCallOnCancel = callOnCancel;
}
@Override
public void onAnimationCancel(Animator animation) {
if (!mCallOnCancel) {
mCalled = true;
}
}
@Override
public void onAnimationEnd(Animator animation) {
if (!mCalled) {
setCurrentView(mViewToSet);
mCalled = true;
}
}
}
}
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