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/*
* Copyright (C) 2015 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 android.support.wearable.view;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.Property;
import android.view.animation.LinearInterpolator;
/**
* Drawable for showing an indeterminate progress indicator.
*
* TODO: When Material progress drawable is available in the support library stop using this.
*
* @hide
*/
@TargetApi(Build.VERSION_CODES.KITKAT_WATCH)
class ProgressDrawable extends Drawable {
private static Property<ProgressDrawable, Integer> LEVEL =
new Property<ProgressDrawable, Integer>(Integer.class, "level") {
@Override
public Integer get(ProgressDrawable drawable) {
return drawable.getLevel();
}
@Override
public void set(ProgressDrawable drawable, Integer value) {
drawable.setLevel(value);
drawable.invalidateSelf();
}
};
/** Max level for a level drawable, as specified in developer docs for {@link Drawable}. */
private static final int MAX_LEVEL = 10000;
/** How many different sections are there, five gives us the material style star. **/
private static final int NUMBER_OF_SEGMENTS = 5;
private static final int LEVELS_PER_SEGMENT = MAX_LEVEL / NUMBER_OF_SEGMENTS;
private static final float STARTING_ANGLE = -90f;
private static final long ANIMATION_DURATION = 6000;
private static final int FULL_CIRCLE = 360;
private static final int MAX_SWEEP = 306;
private static final int CORRECTION_ANGLE = FULL_CIRCLE - MAX_SWEEP;
/** How far through each cycle does the bar stop growing and start shrinking, half way. **/
private static final float GROW_SHRINK_RATIO = 0.5f;
// TODO: replace this with BakedBezierInterpolator when its available in support library.
private static final TimeInterpolator mInterpolator = Gusterpolator.INSTANCE;
private final RectF mInnerCircleBounds = new RectF();
private final Paint mPaint = new Paint();
private final ObjectAnimator mAnimator;
private float mCircleBorderWidth;
private int mCircleBorderColor;
public ProgressDrawable() {
mPaint.setAntiAlias(true);
mPaint.setStyle(Paint.Style.STROKE);
mAnimator = ObjectAnimator.ofInt(this, LEVEL, 0, MAX_LEVEL);
mAnimator.setRepeatCount(ValueAnimator.INFINITE);
mAnimator.setRepeatMode(ValueAnimator.RESTART);
mAnimator.setDuration(ANIMATION_DURATION);
mAnimator.setInterpolator(new LinearInterpolator());
}
public void setRingColor(int color) {
mCircleBorderColor = color;
}
public void setRingWidth(float width) {
mCircleBorderWidth = width;
}
public void startAnimation() {
mAnimator.start();
}
public void stopAnimation() {
mAnimator.cancel();
}
@Override
public void draw(Canvas canvas) {
canvas.save();
mInnerCircleBounds.set(getBounds());
mInnerCircleBounds.inset(mCircleBorderWidth / 2.0f, mCircleBorderWidth / 2.0f);
mPaint.setStrokeWidth(mCircleBorderWidth);
mPaint.setColor(mCircleBorderColor);
float sweepAngle = FULL_CIRCLE;
boolean growing = false;
float correctionAngle = 0;
int level = getLevel();
int currentSegment = level / LEVELS_PER_SEGMENT;
int offset = currentSegment * LEVELS_PER_SEGMENT;
float progress = (level - offset) / (float) LEVELS_PER_SEGMENT;
growing = progress < GROW_SHRINK_RATIO;
correctionAngle = CORRECTION_ANGLE * progress;
if (growing) {
sweepAngle = MAX_SWEEP * mInterpolator.getInterpolation(
lerpInv(0f, GROW_SHRINK_RATIO, progress));
} else {
sweepAngle = MAX_SWEEP * (1.0f - mInterpolator.getInterpolation(
lerpInv(GROW_SHRINK_RATIO, 1.0f, progress)));
}
sweepAngle = Math.max(1, sweepAngle);
canvas.rotate(
level * (1.0f / MAX_LEVEL) * 2 * FULL_CIRCLE + STARTING_ANGLE + correctionAngle,
mInnerCircleBounds.centerX(),
mInnerCircleBounds.centerY());
canvas.drawArc(mInnerCircleBounds,
growing ? 0 : MAX_SWEEP - sweepAngle,
sweepAngle,
false,
mPaint);
canvas.restore();
}
@Override
public void setAlpha(int i) {
// Not supported.
}
@Override
public void setColorFilter(ColorFilter colorFilter) {
// Not supported.
}
@Override
public int getOpacity() {
return PixelFormat.OPAQUE;
}
@Override
protected boolean onLevelChange(int level) {
return true; // Changing the level of this drawable does change its appearance.
}
/**
* Returns the interpolation scalar (s) that satisfies the equation:
* {@code value = }lerp(a, b, s)
*
* <p>If {@code a == b}, then this function will return 0.
*/
private static float lerpInv(float a, float b, float value) {
return a != b ? ((value - a) / (b - a)) : 0.0f;
}
}
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