package com.marshalchen.common.uimodule.rippleDrawable;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
/**
* Draws a Material ripple.
*/
class Ripple {
private static final LinearInterpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
private static final LogInterpolator DECEL_INTERPOLATOR = new LogInterpolator();
private static final float GLOBAL_SPEED = 1.0f;
private static final float WAVE_TOUCH_DOWN_ACCELERATION = 1024.0f * GLOBAL_SPEED;
private static final float WAVE_TOUCH_UP_ACCELERATION = 3400.0f * GLOBAL_SPEED;
private static final float WAVE_OPACITY_DECAY_VELOCITY = 3.0f / GLOBAL_SPEED;
private static final long RIPPLE_ENTER_DELAY = 80;
private final RippleDrawable mOwner;
/** Bounds used for computing max radius. */
private final Rect mBounds;
/** Full-opacity color for drawing this ripple. */
private int mColorOpaque;
/** Maximum ripple radius. */
private float mOuterRadius;
/** Screen density used to adjust pixel-based velocities. */
private float mDensity;
private float mStartingX;
private float mStartingY;
private float mClampedStartingX;
private float mClampedStartingY;
// Software animators.
private ObjectAnimator mAnimRadius;
private ObjectAnimator mAnimOpacity;
private ObjectAnimator mAnimX;
private ObjectAnimator mAnimY;
// Temporary paint used for creating canvas properties.
private Paint mTempPaint;
// Software rendering properties.
private float mOpacity = 1;
private float mOuterX;
private float mOuterY;
// Values used to tween between the start and end positions.
private float mTweenRadius = 0;
private float mTweenX = 0;
private float mTweenY = 0;
/** Whether we have an explicit maximum radius. */
private boolean mHasMaxRadius;
/** Whether we were canceled externally and should avoid self-removal. */
private boolean mCanceled;
/**
* Creates a new ripple.
*/
public Ripple(RippleDrawable owner, Rect bounds, float startingX, float startingY) {
mOwner = owner;
mBounds = bounds;
mStartingX = startingX;
mStartingY = startingY;
}
public void setup(int maxRadius, int color, float density) {
mColorOpaque = color | 0xFF000000;
if (maxRadius != -1) {
mHasMaxRadius = true;
mOuterRadius = maxRadius;
} else {
final float halfWidth = mBounds.width() / 2.0f;
final float halfHeight = mBounds.height() / 2.0f;
mOuterRadius = (float) Math.sqrt(halfWidth * halfWidth + halfHeight * halfHeight);
}
mOuterX = 0;
mOuterY = 0;
mDensity = density;
clampStartingPosition();
}
private void clampStartingPosition() {
final float cX = mBounds.exactCenterX();
final float cY = mBounds.exactCenterY();
final float dX = mStartingX - cX;
final float dY = mStartingY - cY;
final float r = mOuterRadius;
if (dX * dX + dY * dY > r * r) {
// Point is outside the circle, clamp to the circumference.
final double angle = Math.atan2(dY, dX);
mClampedStartingX = cX + (float) (Math.cos(angle) * r);
mClampedStartingY = cY + (float) (Math.sin(angle) * r);
} else {
mClampedStartingX = mStartingX;
mClampedStartingY = mStartingY;
}
}
public void onHotspotBoundsChanged() {
if (!mHasMaxRadius) {
final float halfWidth = mBounds.width() / 2.0f;
final float halfHeight = mBounds.height() / 2.0f;
mOuterRadius = (float) Math.sqrt(halfWidth * halfWidth + halfHeight * halfHeight);
clampStartingPosition();
}
}
public void setOpacity(float a) {
mOpacity = a;
invalidateSelf();
}
public float getOpacity() {
return mOpacity;
}
@SuppressWarnings("unused")
public void setRadiusGravity(float r) {
mTweenRadius = r;
invalidateSelf();
}
@SuppressWarnings("unused")
public float getRadiusGravity() {
return mTweenRadius;
}
@SuppressWarnings("unused")
public void setXGravity(float x) {
mTweenX = x;
invalidateSelf();
}
@SuppressWarnings("unused")
public float getXGravity() {
return mTweenX;
}
@SuppressWarnings("unused")
public void setYGravity(float y) {
mTweenY = y;
invalidateSelf();
}
@SuppressWarnings("unused")
public float getYGravity() {
return mTweenY;
}
/**
* Draws the ripple centered at (0,0) using the specified paint.
*/
public boolean draw(Canvas c, Paint p) {
final boolean hasContent;
hasContent = drawSoftware(c, p);
return hasContent;
}
private boolean drawSoftware(Canvas c, Paint p) {
boolean hasContent = false;
p.setColor(mColorOpaque);
final int alpha = (int) (255 * mOpacity + 0.5f);
final float radius = lerp(0, mOuterRadius, mTweenRadius);
if (alpha > 0 && radius > 0) {
final float x = lerp(
mClampedStartingX - mBounds.exactCenterX(), mOuterX, mTweenX);
final float y = lerp(
mClampedStartingY - mBounds.exactCenterY(), mOuterY, mTweenY);
p.setAlpha(alpha);
p.setStyle(Style.FILL);
c.drawCircle(x, y, radius, p);
hasContent = true;
}
return hasContent;
}
public static float lerp(float start, float stop, float amount) {
return start + (stop - start) * amount;
}
/**
* Returns the maximum bounds of the ripple relative to the ripple center.
*/
public void getBounds(Rect bounds) {
final int outerX = (int) mOuterX;
final int outerY = (int) mOuterY;
final int r = (int) mOuterRadius + 1;
bounds.set(outerX - r, outerY - r, outerX + r, outerY + r);
}
/**
* Specifies the starting position relative to the drawable bounds. No-op if
* the ripple has already entered.
*/
public void move(float x, float y) {
mStartingX = x;
mStartingY = y;
clampStartingPosition();
}
/**
* Starts the enter animation.
*/
public void enter() {
cancel();
final int radiusDuration = (int)
(1000 * Math.sqrt(mOuterRadius / WAVE_TOUCH_DOWN_ACCELERATION * mDensity) + 0.5);
final ObjectAnimator radius = ObjectAnimator.ofFloat(this, "radiusGravity", 1);
radius.setAutoCancel(true);
radius.setDuration(radiusDuration);
radius.setInterpolator(LINEAR_INTERPOLATOR);
radius.setStartDelay(RIPPLE_ENTER_DELAY);
final ObjectAnimator cX = ObjectAnimator.ofFloat(this, "xGravity", 1);
cX.setAutoCancel(true);
cX.setDuration(radiusDuration);
cX.setInterpolator(LINEAR_INTERPOLATOR);
cX.setStartDelay(RIPPLE_ENTER_DELAY);
final ObjectAnimator cY = ObjectAnimator.ofFloat(this, "yGravity", 1);
cY.setAutoCancel(true);
cY.setDuration(radiusDuration);
cY.setInterpolator(LINEAR_INTERPOLATOR);
cY.setStartDelay(RIPPLE_ENTER_DELAY);
mAnimRadius = radius;
mAnimX = cX;
mAnimY = cY;
// Enter animations always run on the UI thread, since it's unlikely
// that anything interesting is happening until the user lifts their
// finger.
radius.start();
cX.start();
cY.start();
}
/**
* Starts the exit animation.
*/
public void exit() {
cancel();
final float radius = lerp(0, mOuterRadius, mTweenRadius);
final float remaining;
if (mAnimRadius != null && mAnimRadius.isRunning()) {
remaining = mOuterRadius - radius;
} else {
remaining = mOuterRadius;
}
final int radiusDuration = (int) (1000 * Math.sqrt(remaining / (WAVE_TOUCH_UP_ACCELERATION
+ WAVE_TOUCH_DOWN_ACCELERATION) * mDensity) + 0.5);
final int opacityDuration = (int) (1000 * mOpacity / WAVE_OPACITY_DECAY_VELOCITY + 0.5f);
exitSoftware(radiusDuration, opacityDuration);
}
/**
* Jump all animations to their end state. The caller is responsible for
* removing the ripple from the list of animating ripples.
*/
public void jump() {
mCanceled = true;
endSoftwareAnimations();
mCanceled = false;
}
private void endSoftwareAnimations() {
if (mAnimRadius != null) {
mAnimRadius.end();
mAnimRadius = null;
}
if (mAnimOpacity != null) {
mAnimOpacity.end();
mAnimOpacity = null;
}
if (mAnimX != null) {
mAnimX.end();
mAnimX = null;
}
if (mAnimY != null) {
mAnimY.end();
mAnimY = null;
}
}
private Paint getTempPaint() {
if (mTempPaint == null) {
mTempPaint = new Paint();
}
return mTempPaint;
}
private void exitSoftware(int radiusDuration, int opacityDuration) {
final ObjectAnimator radiusAnim = ObjectAnimator.ofFloat(this, "radiusGravity", 1);
radiusAnim.setAutoCancel(true);
radiusAnim.setDuration(radiusDuration);
radiusAnim.setInterpolator(DECEL_INTERPOLATOR);
final ObjectAnimator xAnim = ObjectAnimator.ofFloat(this, "xGravity", 1);
xAnim.setAutoCancel(true);
xAnim.setDuration(radiusDuration);
xAnim.setInterpolator(DECEL_INTERPOLATOR);
final ObjectAnimator yAnim = ObjectAnimator.ofFloat(this, "yGravity", 1);
yAnim.setAutoCancel(true);
yAnim.setDuration(radiusDuration);
yAnim.setInterpolator(DECEL_INTERPOLATOR);
final ObjectAnimator opacityAnim = ObjectAnimator.ofFloat(this, "opacity", 0);
opacityAnim.setAutoCancel(true);
opacityAnim.setDuration(opacityDuration);
opacityAnim.setInterpolator(LINEAR_INTERPOLATOR);
opacityAnim.addListener(mAnimationListener);
mAnimRadius = radiusAnim;
mAnimOpacity = opacityAnim;
mAnimX = xAnim;
mAnimY = yAnim;
radiusAnim.start();
opacityAnim.start();
xAnim.start();
yAnim.start();
}
/**
* Cancels all animations. The caller is responsible for removing
* the ripple from the list of animating ripples.
*/
public void cancel() {
mCanceled = true;
cancelSoftwareAnimations();
mCanceled = false;
}
private void cancelSoftwareAnimations() {
if (mAnimRadius != null) {
mAnimRadius.cancel();
mAnimRadius = null;
}
if (mAnimOpacity != null) {
mAnimOpacity.cancel();
mAnimOpacity = null;
}
if (mAnimX != null) {
mAnimX.cancel();
mAnimX = null;
}
if (mAnimY != null) {
mAnimY.cancel();
mAnimY = null;
}
}
private void removeSelf() {
// The owner will invalidate itself.
if (!mCanceled) {
mOwner.removeRipple(this);
}
}
private void invalidateSelf() {
mOwner.invalidateSelf();
}
private final AnimatorListenerAdapter mAnimationListener = new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
removeSelf();
}
};
/**
* Interpolator with a smooth log deceleration
*/
private static final class LogInterpolator implements Interpolator {
@Override
public float getInterpolation(float input) {
return 1 - (float) Math.pow(400, -input * 1.4);
}
}
}