1 files changed, 279 insertions, 0 deletions
diff --git a/java/com/android/newbubble/NewMoveHandler.java b/java/com/android/newbubble/NewMoveHandler.java
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+++ b/java/com/android/newbubble/NewMoveHandler.java
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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.newbubble;
+
+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.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 NewMoveHandler 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 NewBubble bubble;
+  private final int minX;
+  private final int minY;
+  private final int maxX;
+  private final int maxY;
+  private final int bubbleSize;
+  private final float touchSlopSquared;
+
+  private boolean clickable = true;
+  private boolean isMoving;
+  private float firstX;
+  private float firstY;
+
+  private SpringAnimation moveXAnimation;
+  private SpringAnimation moveYAnimation;
+  private VelocityTracker velocityTracker;
+  private Scroller scroller;
+
+  private static float clamp(float value, float min, float max) {
+    return Math.min(max, Math.max(min, value));
+  }
+
+  // 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;
+          if (relativeToRight(windowParams)) {
+            int displayWidth = context.getResources().getDisplayMetrics().widthPixels;
+            realX = displayWidth - realX;
+          }
+          return clamp(realX, minX, maxX);
+        }
+
+        @Override
+        public void setValue(LayoutParams windowParams, float value) {
+          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;
+          windowParams.x =
+              (int) (onRight ? (displayWidth - value - centeringOffset) : value - centeringOffset);
+          windowParams.gravity = Gravity.TOP | (onRight ? Gravity.RIGHT : Gravity.LEFT);
+          if (bubble.isVisible()) {
+            windowManager.updateViewLayout(bubble.getRootView(), windowParams);
+          }
+        }
+      };
+
+  private final FloatPropertyCompat<WindowManager.LayoutParams> yProperty =
+      new FloatPropertyCompat<LayoutParams>("yProperty") {
+        @Override
+        public float getValue(LayoutParams object) {
+          return clamp(object.y + bubbleSize, minY, maxY);
+        }
+
+        @Override
+        public void setValue(LayoutParams object, float value) {
+          object.y = (int) value - bubbleSize;
+          if (bubble.isVisible()) {
+            windowManager.updateViewLayout(bubble.getRootView(), object);
+          }
+        }
+      };
+
+  public NewMoveHandler(@NonNull View targetView, @NonNull NewBubble bubble) {
+    this.bubble = bubble;
+    context = targetView.getContext();
+    windowManager = context.getSystemService(WindowManager.class);
+
+    bubbleSize = context.getResources().getDimensionPixelSize(R.dimen.bubble_size);
+    minX =
+        context.getResources().getDimensionPixelOffset(R.dimen.bubble_safe_margin_horizontal)
+            + bubbleSize / 2;
+    minY =
+        context.getResources().getDimensionPixelOffset(R.dimen.bubble_safe_margin_vertical)
+            + 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 void setClickable(boolean clickable) {
+    this.clickable = clickable;
+  }
+
+  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(clamp(eventX, minX, maxX));
+          moveYAnimation.animateToFinalPosition(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();
+          if (clickable) {
+            bubble.primaryButtonClick();
+          }
+        }
+        break;
+      default: // fall out
+    }
+    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;
+  }
+}