/**
* This code was modified by me, Paul Woitaschek. All these changes are licensed under GPLv3. The
* original source can be found here: {@link https://github.com/alexjlockwood/material-pause-play-
* animation/blob/master/app/src/main/java/com/alexjlockwood/example/playpauseanimation/
* PlayPauseView.java}
* <p/>
* The original licensing is as follows:
* <p/>
* <p/>
* The MIT License (MIT)
* <p/>
* Copyright (c) 2015 Alex Lockwood
* <p/>
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
* associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* <p/>
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
* <p/>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package com.naman14.timber.widgets;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.support.annotation.Nullable;
import android.util.Log;
import android.util.Property;
import android.view.animation.DecelerateInterpolator;
public class PlayPauseDrawable extends Drawable {
private static final String TAG = PlayPauseDrawable.class.getSimpleName();
private final Path leftPauseBar = new Path();
private final Path rightPauseBar = new Path();
private final Paint paint = new Paint();
private float progress;
private static final Property<PlayPauseDrawable, Float> PROGRESS =
new Property<PlayPauseDrawable, Float>(Float.class, "progress") {
@Override
public Float get(PlayPauseDrawable d) {
return d.getProgress();
}
@Override
public void set(PlayPauseDrawable d, Float value) {
d.setProgress(value);
}
};
private boolean isPlay;
@Nullable
private Animator animator;
public PlayPauseDrawable() {
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
}
/**
* Linear interpolate between a and b with parameter t.
*/
private static float interpolate(float a, float b, float t) {
return a + (b - a) * t;
}
@Override
public void draw(Canvas canvas) {
long startDraw = System.currentTimeMillis();
leftPauseBar.rewind();
rightPauseBar.rewind();
// move to center of canvas
canvas.translate(getBounds().left, getBounds().top);
float pauseBarHeight = 7.0F / 12.0F * ((float) getBounds().height());
float pauseBarWidth = pauseBarHeight / 3.0F;
float pauseBarDistance = pauseBarHeight / 3.6F;
// The current distance between the two pause bars.
final float barDist = interpolate(pauseBarDistance, 0.0F, progress);
// The current width of each pause bar.
final float barWidth = interpolate(pauseBarWidth, pauseBarHeight / 1.75F, progress);
// The current position of the left pause bar's top left coordinate.
final float firstBarTopLeft = interpolate(0.0F, barWidth, progress);
// The current position of the right pause bar's top right coordinate.
final float secondBarTopRight = interpolate(2.0F * barWidth + barDist, barWidth + barDist, progress);
// Draw the left pause bar. The left pause bar transforms into the
// top half of the play button triangle by animating the position of the
// rectangle's top left coordinate and expanding its bottom width.
leftPauseBar.moveTo(0.0F, 0.0F);
leftPauseBar.lineTo(firstBarTopLeft, -pauseBarHeight);
leftPauseBar.lineTo(barWidth, -pauseBarHeight);
leftPauseBar.lineTo(barWidth, 0.0F);
leftPauseBar.close();
// Draw the right pause bar. The right pause bar transforms into the
// bottom half of the play button triangle by animating the position of the
// rectangle's top right coordinate and expanding its bottom width.
rightPauseBar.moveTo(barWidth + barDist, 0.0F);
rightPauseBar.lineTo(barWidth + barDist, -pauseBarHeight);
rightPauseBar.lineTo(secondBarTopRight, -pauseBarHeight);
rightPauseBar.lineTo(2.0F * barWidth + barDist, 0.0F);
rightPauseBar.close();
canvas.save();
// Translate the play button a tiny bit to the right so it looks more centered.
canvas.translate(interpolate(0.0F, pauseBarHeight / 8.0F, progress), 0.0F);
// (1) Pause --> Play: rotate 0 to 90 degrees clockwise.
// (2) Play --> Pause: rotate 90 to 180 degrees clockwise.
final float rotationProgress = isPlay ? 1.0F - progress : progress;
final float startingRotation = isPlay ? 90.0F : 0.0F;
canvas.rotate(interpolate(startingRotation, startingRotation + 90.0F, rotationProgress), getBounds().width() / 2.0F, getBounds().height() / 2.0F);
// Position the pause/play button in the center of the drawable's bounds.
canvas.translate(getBounds().width() / 2.0F - ((2.0F * barWidth + barDist) / 2.0F), getBounds().height() / 2.0F + (pauseBarHeight / 2.0F));
// Draw the two bars that form the animated pause/play button.
canvas.drawPath(leftPauseBar, paint);
canvas.drawPath(rightPauseBar, paint);
canvas.restore();
long timeElapsed = System.currentTimeMillis() - startDraw;
if (timeElapsed > 16) {
Log.e(TAG, "Drawing took too long=" + timeElapsed);
}
}
public void transformToPause(boolean animated) {
if (isPlay) {
if (animated) {
toggle();
} else {
isPlay = false;
setProgress(0.0F);
}
}
}
@Override
public void jumpToCurrentState() {
Log.v(TAG, "jumpToCurrentState()");
if (animator != null) {
animator.cancel();
}
setProgress(isPlay ? 1.0F : 0.0F);
}
public void transformToPlay(boolean animated) {
if (!isPlay) {
if (animated) {
toggle();
} else {
isPlay = true;
setProgress(1.0F);
}
}
}
private void toggle() {
if (animator != null) {
animator.cancel();
}
animator = ObjectAnimator.ofFloat(this, PROGRESS, isPlay ? 1.0F : 0.0F, isPlay ? 0.0F : 1.0F);
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
isPlay = !isPlay;
}
});
animator.setInterpolator(new DecelerateInterpolator());
animator.setDuration(200);
animator.start();
}
private float getProgress() {
return progress;
}
private void setProgress(float progress) {
this.progress = progress;
invalidateSelf();
}
@Override
public void setAlpha(int alpha) {
paint.setAlpha(alpha);
invalidateSelf();
}
@Override
public void setColorFilter(ColorFilter cf) {
paint.setColorFilter(cf);
invalidateSelf();
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
}