content: /*
   * 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.internal.widget;
  
  import android.view.MotionEvent;
  import android.view.VelocityTracker;
  import android.view.View;
  import android.view.ViewConfiguration;
  import android.view.ViewParent;
  
  /**
   * This interface should be implemented by {@link android.view.View View} subclasses that wish
   * to support dispatching nested scrolling operations to a cooperating parent
   * {@link android.view.ViewGroup ViewGroup}.
   *
   * <p>Classes implementing this interface should create a final instance of a
   * {@link NestedScrollingChildHelper} as a field and delegate any View methods to the
   * <code>NestedScrollingChildHelper</code> methods of the same signature.</p>
   *
   * <p>Views invoking nested scrolling functionality should always do so from the relevant
   * {@link ViewCompat}, {@link ViewGroupCompat} or {@link ViewParentCompat} compatibility
   * shim static methods. This ensures interoperability with nested scrolling views on Android
   * 5.0 Lollipop and newer.</p>
   */
  public interface NestedScrollingChild {
      /**
       * Enable or disable nested scrolling for this view.
       *
       * <p>If this property is set to true the view will be permitted to initiate nested
       * scrolling operations with a compatible parent view in the current hierarchy. If this
       * view does not implement nested scrolling this will have no effect. Disabling nested scrolling
       * while a nested scroll is in progress has the effect of {@link #stopNestedScroll() stopping}
       * the nested scroll.</p>
       *
       * @param enabled true to enable nested scrolling, false to disable
       *
       * @see #isNestedScrollingEnabled()
       */
      void setNestedScrollingEnabled(boolean enabled);
  
      /**
       * Returns true if nested scrolling is enabled for this view.
       *
       * <p>If nested scrolling is enabled and this View class implementation supports it,
       * this view will act as a nested scrolling child view when applicable, forwarding data
       * about the scroll operation in progress to a compatible and cooperating nested scrolling
       * parent.</p>
       *
       * @return true if nested scrolling is enabled
       *
       * @see #setNestedScrollingEnabled(boolean)
       */
      boolean isNestedScrollingEnabled();
  
      /**
       * Begin a nestable scroll operation along the given axes.
       *
       * <p>A view starting a nested scroll promises to abide by the following contract:</p>
       *
       * <p>The view will call startNestedScroll upon initiating a scroll operation. In the case
       * of a touch scroll this corresponds to the initial {@link MotionEvent#ACTION_DOWN}.
       * In the case of touch scrolling the nested scroll will be terminated automatically in
       * the same manner as {@link ViewParent#requestDisallowInterceptTouchEvent(boolean)}.
       * In the event of programmatic scrolling the caller must explicitly call
       * {@link #stopNestedScroll()} to indicate the end of the nested scroll.</p>
       *
       * <p>If <code>startNestedScroll</code> returns true, a cooperative parent was found.
       * If it returns false the caller may ignore the rest of this contract until the next scroll.
       * Calling startNestedScroll while a nested scroll is already in progress will return true.</p>
       *
       * <p>At each incremental step of the scroll the caller should invoke
       * {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll}
       * once it has calculated the requested scrolling delta. If it returns true the nested scrolling
       * parent at least partially consumed the scroll and the caller should adjust the amount it
       * scrolls by.</p>
       *
       * <p>After applying the remainder of the scroll delta the caller should invoke
       * {@link #dispatchNestedScroll(int, int, int, int, int[]) dispatchNestedScroll}, passing
       * both the delta consumed and the delta unconsumed. A nested scrolling parent may treat
       * these values differently. See
       * {@link NestedScrollingParent#onNestedScroll(View, int, int, int, int)}.
       * </p>
       *
       * @param axes Flags consisting of a combination of {@link ViewCompat#SCROLL_AXIS_HORIZONTAL}
       *             and/or {@link ViewCompat#SCROLL_AXIS_VERTICAL}.
       * @return true if a cooperative parent was found and nested scrolling has been enabled for
       *         the current gesture.
       *
       * @see #stopNestedScroll()
       * @see #dispatchNestedPreScroll(int, int, int[], int[])
       * @see #dispatchNestedScroll(int, int, int, int, int[])
       */
      boolean startNestedScroll(int axes);
  
      /**
       * Stop a nested scroll in progress.
       *
       * <p>Calling this method when a nested scroll is not currently in progress is harmless.</p>
       *
       * @see #startNestedScroll(int)
       */
      void stopNestedScroll();
  
      /**
       * Returns true if this view has a nested scrolling parent.
       *
       * <p>The presence of a nested scrolling parent indicates that this view has initiated
       * a nested scroll and it was accepted by an ancestor view further up the view hierarchy.</p>
       *
       * @return whether this view has a nested scrolling parent
       */
      boolean hasNestedScrollingParent();
  
      /**
       * Dispatch one step of a nested scroll in progress.
       *
       * <p>Implementations of views that support nested scrolling should call this to report
       * info about a scroll in progress to the current nested scrolling parent. If a nested scroll
       * is not currently in progress or nested scrolling is not
       * {@link #isNestedScrollingEnabled() enabled} for this view this method does nothing.</p>
       *
       * <p>Compatible View implementations should also call
       * {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll} before
       * consuming a component of the scroll event themselves.</p>
       *
       * @param dxConsumed Horizontal distance in pixels consumed by this view during this scroll step
       * @param dyConsumed Vertical distance in pixels consumed by this view during this scroll step
       * @param dxUnconsumed Horizontal scroll distance in pixels not consumed by this view
       * @param dyUnconsumed Horizontal scroll distance in pixels not consumed by this view
       * @param offsetInWindow Optional. If not null, on return this will contain the offset
       *                       in local view coordinates of this view from before this operation
       *                       to after it completes. View implementations may use this to adjust
       *                       expected input coordinate tracking.
       * @return true if the event was dispatched, false if it could not be dispatched.
       * @see #dispatchNestedPreScroll(int, int, int[], int[])
       */
      boolean dispatchNestedScroll(int dxConsumed, int dyConsumed,
              int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow);
  
      /**
       * Dispatch one step of a nested scroll in progress before this view consumes any portion of it.
       *
       * <p>Nested pre-scroll events are to nested scroll events what touch intercept is to touch.
       * <code>dispatchNestedPreScroll</code> offers an opportunity for the parent view in a nested
       * scrolling operation to consume some or all of the scroll operation before the child view
       * consumes it.</p>
       *
       * @param dx Horizontal scroll distance in pixels
       * @param dy Vertical scroll distance in pixels
       * @param consumed Output. If not null, consumed[0] will contain the consumed component of dx
       *                 and consumed[1] the consumed dy.
       * @param offsetInWindow Optional. If not null, on return this will contain the offset
       *                       in local view coordinates of this view from before this operation
       *                       to after it completes. View implementations may use this to adjust
       *                       expected input coordinate tracking.
       * @return true if the parent consumed some or all of the scroll delta
       * @see #dispatchNestedScroll(int, int, int, int, int[])
       */
      boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow);
  
      /**
       * Dispatch a fling to a nested scrolling parent.
       *
       * <p>This method should be used to indicate that a nested scrolling child has detected
       * suitable conditions for a fling. Generally this means that a touch scroll has ended with a
       * {@link VelocityTracker velocity} in the direction of scrolling that meets or exceeds
       * the {@link ViewConfiguration#getScaledMinimumFlingVelocity() minimum fling velocity}
       * along a scrollable axis.</p>
       *
       * <p>If a nested scrolling child view would normally fling but it is at the edge of
       * its own content, it can use this method to delegate the fling to its nested scrolling
       * parent instead. The parent may optionally consume the fling or observe a child fling.</p>
       *
       * @param velocityX Horizontal fling velocity in pixels per second
       * @param velocityY Vertical fling velocity in pixels per second
       * @param consumed true if the child consumed the fling, false otherwise
       * @return true if the nested scrolling parent consumed or otherwise reacted to the fling
       */
      boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed);
  
      /**
       * Dispatch a fling to a nested scrolling parent before it is processed by this view.
       *
       * <p>Nested pre-fling events are to nested fling events what touch intercept is to touch
       * and what nested pre-scroll is to nested scroll. <code>dispatchNestedPreFling</code>
       * offsets an opportunity for the parent view in a nested fling to fully consume the fling
       * before the child view consumes it. If this method returns <code>true</code>, a nested
       * parent view consumed the fling and this view should not scroll as a result.</p>
       *
       * <p>For a better user experience, only one view in a nested scrolling chain should consume
       * the fling at a time. If a parent view consumed the fling this method will return false.
       * Custom view implementations should account for this in two ways:</p>
       *
       * <ul>
       *     <li>If a custom view is paged and needs to settle to a fixed page-point, do not
       *     call <code>dispatchNestedPreFling</code>; consume the fling and settle to a valid
       *     position regardless.</li>
       *     <li>If a nested parent does consume the fling, this view should not scroll at all,
       *     even to settle back to a valid idle position.</li>
       * </ul>
       *
       * <p>Views should also not offer fling velocities to nested parent views along an axis
       * where scrolling is not currently supported; a {@link android.widget.ScrollView ScrollView}
       * should not offer a horizontal fling velocity to its parents since scrolling along that
       * axis is not permitted and carrying velocity along that motion does not make sense.</p>
       *
       * @param velocityX Horizontal fling velocity in pixels per second
       * @param velocityY Vertical fling velocity in pixels per second
       * @return true if a nested scrolling parent consumed the fling
       */
      boolean dispatchNestedPreFling(float velocityX, float velocityY);
  }
  