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/*
* Copyright (C) 2017 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.dialershared.bubble;
import android.content.Context;
import android.graphics.Point;
import android.support.animation.FloatPropertyCompat;
import android.support.animation.SpringAnimation;
import android.support.animation.SpringForce;
import android.support.annotation.NonNull;
import android.support.v4.math.MathUtils;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewConfiguration;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.Scroller;
/** Handles touches and manages moving the bubble in response */
class MoveHandler implements OnTouchListener {
// Amount the ViewConfiguration's minFlingVelocity will be scaled by for our own minVelocity
private static final int MIN_FLING_VELOCITY_FACTOR = 8;
// The friction multiplier to control how slippery the bubble is when flung
private static final float SCROLL_FRICTION_MULTIPLIER = 4f;
private final Context context;
private final WindowManager windowManager;
private final Bubble bubble;
private final int minX;
private final int minY;
private final int maxX;
private final int maxY;
private final int bubbleSize;
private final int shadowPaddingSize;
private final float touchSlopSquared;
private boolean isMoving;
private float firstX;
private float firstY;
private SpringAnimation moveXAnimation;
private SpringAnimation moveYAnimation;
private VelocityTracker velocityTracker;
private Scroller scroller;
// Handles the left/right gravity conversion and centering
private final FloatPropertyCompat<WindowManager.LayoutParams> xProperty =
new FloatPropertyCompat<LayoutParams>("xProperty") {
@Override
public float getValue(LayoutParams windowParams) {
int realX = windowParams.x;
realX = realX + bubbleSize / 2;
realX = realX + shadowPaddingSize;
if (relativeToRight(windowParams)) {
int displayWidth = context.getResources().getDisplayMetrics().widthPixels;
realX = displayWidth - realX;
}
return MathUtils.clamp(realX, minX, maxX);
}
@Override
public void setValue(LayoutParams windowParams, float value) {
boolean wasOnRight = (windowParams.gravity & Gravity.RIGHT) == Gravity.RIGHT;
int displayWidth = context.getResources().getDisplayMetrics().widthPixels;
boolean onRight;
Integer gravityOverride = bubble.getGravityOverride();
if (gravityOverride == null) {
onRight = value > displayWidth / 2;
} else {
onRight = (gravityOverride & Gravity.RIGHT) == Gravity.RIGHT;
}
int centeringOffset = bubbleSize / 2 + shadowPaddingSize;
windowParams.x =
(int) (onRight ? (displayWidth - value - centeringOffset) : value - centeringOffset);
windowParams.gravity = Gravity.TOP | (onRight ? Gravity.RIGHT : Gravity.LEFT);
if (wasOnRight != onRight) {
bubble.onLeftRightSwitch(onRight);
}
if (bubble.isShowing()) {
windowManager.updateViewLayout(bubble.getRootView(), windowParams);
}
}
};
private final FloatPropertyCompat<WindowManager.LayoutParams> yProperty =
new FloatPropertyCompat<LayoutParams>("yProperty") {
@Override
public float getValue(LayoutParams object) {
return MathUtils.clamp(object.y + bubbleSize + shadowPaddingSize, minY, maxY);
}
@Override
public void setValue(LayoutParams object, float value) {
object.y = (int) value - bubbleSize - shadowPaddingSize;
if (bubble.isShowing()) {
windowManager.updateViewLayout(bubble.getRootView(), object);
}
}
};
public MoveHandler(@NonNull View targetView, @NonNull Bubble bubble) {
this.bubble = bubble;
context = targetView.getContext();
windowManager = context.getSystemService(WindowManager.class);
bubbleSize = context.getResources().getDimensionPixelSize(R.dimen.bubble_size);
shadowPaddingSize =
context.getResources().getDimensionPixelOffset(R.dimen.bubble_shadow_padding_size);
minX =
context.getResources().getDimensionPixelOffset(R.dimen.bubble_safe_margin_x)
+ bubbleSize / 2;
minY =
context.getResources().getDimensionPixelOffset(R.dimen.bubble_safe_margin_y)
+ bubbleSize / 2;
maxX = context.getResources().getDisplayMetrics().widthPixels - minX;
maxY = context.getResources().getDisplayMetrics().heightPixels - minY;
// Squared because it will be compared against the square of the touch delta. This is more
// efficient than needing to take a square root.
touchSlopSquared = (float) Math.pow(ViewConfiguration.get(context).getScaledTouchSlop(), 2);
targetView.setOnTouchListener(this);
}
public boolean isMoving() {
return isMoving;
}
public void undoGravityOverride() {
LayoutParams windowParams = bubble.getWindowParams();
xProperty.setValue(windowParams, xProperty.getValue(windowParams));
}
public void snapToBounds() {
ensureSprings();
moveXAnimation.animateToFinalPosition(relativeToRight(bubble.getWindowParams()) ? maxX : minX);
moveYAnimation.animateToFinalPosition(yProperty.getValue(bubble.getWindowParams()));
}
@Override
public boolean onTouch(View v, MotionEvent event) {
float eventX = event.getRawX();
float eventY = event.getRawY();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
firstX = eventX;
firstY = eventY;
velocityTracker = VelocityTracker.obtain();
break;
case MotionEvent.ACTION_MOVE:
if (isMoving || hasExceededTouchSlop(event)) {
if (!isMoving) {
isMoving = true;
bubble.onMoveStart();
}
ensureSprings();
moveXAnimation.animateToFinalPosition(MathUtils.clamp(eventX, minX, maxX));
moveYAnimation.animateToFinalPosition(MathUtils.clamp(eventY, minY, maxY));
}
velocityTracker.addMovement(event);
break;
case MotionEvent.ACTION_UP:
if (isMoving) {
ViewConfiguration viewConfiguration = ViewConfiguration.get(context);
velocityTracker.computeCurrentVelocity(
1000, viewConfiguration.getScaledMaximumFlingVelocity());
float xVelocity = velocityTracker.getXVelocity();
float yVelocity = velocityTracker.getYVelocity();
boolean isFling = isFling(xVelocity, yVelocity);
if (isFling) {
Point target =
findTarget(
xVelocity,
yVelocity,
(int) xProperty.getValue(bubble.getWindowParams()),
(int) yProperty.getValue(bubble.getWindowParams()));
moveXAnimation.animateToFinalPosition(target.x);
moveYAnimation.animateToFinalPosition(target.y);
} else {
snapX();
}
isMoving = false;
bubble.onMoveFinish();
} else {
v.performClick();
bubble.primaryButtonClick();
}
break;
}
return true;
}
private void ensureSprings() {
if (moveXAnimation == null) {
moveXAnimation = new SpringAnimation(bubble.getWindowParams(), xProperty);
moveXAnimation.setSpring(new SpringForce());
moveXAnimation.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_NO_BOUNCY);
}
if (moveYAnimation == null) {
moveYAnimation = new SpringAnimation(bubble.getWindowParams(), yProperty);
moveYAnimation.setSpring(new SpringForce());
moveYAnimation.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_NO_BOUNCY);
}
}
private Point findTarget(float xVelocity, float yVelocity, int startX, int startY) {
if (scroller == null) {
scroller = new Scroller(context);
scroller.setFriction(ViewConfiguration.getScrollFriction() * SCROLL_FRICTION_MULTIPLIER);
}
// Find where a fling would end vertically
scroller.fling(startX, startY, (int) xVelocity, (int) yVelocity, minX, maxX, minY, maxY);
int targetY = scroller.getFinalY();
scroller.abortAnimation();
// If the x component of the velocity is above the minimum fling velocity, use velocity to
// determine edge. Otherwise use its starting position
boolean pullRight = isFling(xVelocity, 0) ? xVelocity > 0 : isOnRightHalf(startX);
return new Point(pullRight ? maxX : minX, targetY);
}
private boolean isFling(float xVelocity, float yVelocity) {
int minFlingVelocity =
ViewConfiguration.get(context).getScaledMinimumFlingVelocity() * MIN_FLING_VELOCITY_FACTOR;
return getMagnitudeSquared(xVelocity, yVelocity) > minFlingVelocity * minFlingVelocity;
}
private boolean isOnRightHalf(float currentX) {
return currentX > (minX + maxX) / 2;
}
private void snapX() {
// Check if x value is closer to min or max
boolean pullRight = isOnRightHalf(xProperty.getValue(bubble.getWindowParams()));
moveXAnimation.animateToFinalPosition(pullRight ? maxX : minX);
}
private boolean relativeToRight(LayoutParams windowParams) {
return (windowParams.gravity & Gravity.RIGHT) == Gravity.RIGHT;
}
private boolean hasExceededTouchSlop(MotionEvent event) {
return getMagnitudeSquared(event.getRawX() - firstX, event.getRawY() - firstY)
> touchSlopSquared;
}
private float getMagnitudeSquared(float deltaX, float deltaY) {
return deltaX * deltaX + deltaY * deltaY;
}
}
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