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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.support.v7.widget;
     18 
     19 import android.content.Context;
     20 import android.support.v4.view.NestedScrollingParent;
     21 import android.support.v4.view.ViewCompat;
     22 import android.util.Log;
     23 import android.view.View;
     24 import android.widget.FrameLayout;
     25 
     26 public class TestedFrameLayout extends FrameLayout implements NestedScrollingParent {
     27 
     28     static final int TEST_NESTED_SCROLL_MODE_IGNORE = 0;
     29     static final int TEST_NESTED_SCROLL_MODE_CONSUME = 1;
     30 
     31     private int mNestedScrollMode;
     32     private int mNestedFlingMode;
     33     private boolean mNestedStopNestedScrollCalled;
     34 
     35     public TestedFrameLayout(Context context) {
     36         super(context);
     37     }
     38 
     39     @Override
     40     public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
     41         // Always start nested scroll
     42         return mNestedFlingMode == TEST_NESTED_SCROLL_MODE_CONSUME
     43                 || mNestedScrollMode == TEST_NESTED_SCROLL_MODE_CONSUME;
     44     }
     45 
     46     @Override
     47     public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
     48         Log.d("TestedFrameLayout", "onNestedPreFling: " + mNestedFlingMode);
     49 
     50         return mNestedFlingMode == TEST_NESTED_SCROLL_MODE_CONSUME;
     51     }
     52 
     53     @Override
     54     public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
     55         if (mNestedScrollMode == TEST_NESTED_SCROLL_MODE_CONSUME) {
     56             // We consume all scroll deltas
     57             consumed[0] = dx;
     58             consumed[1] = dy;
     59         }
     60     }
     61 
     62     @Override
     63     public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed,
     64             int dyUnconsumed) {
     65         // ignore
     66     }
     67 
     68     @Override
     69     public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
     70         // ignore
     71         return false;
     72     }
     73 
     74     @Override
     75     public void onNestedScrollAccepted(View child, View target, int axes) {
     76         // ignore
     77     }
     78 
     79     @Override
     80     public int getNestedScrollAxes() {
     81         // We can scroll in both direction
     82         return ViewCompat.SCROLL_AXIS_HORIZONTAL | ViewCompat.SCROLL_AXIS_VERTICAL;
     83     }
     84 
     85     @Override
     86     public void onStopNestedScroll(View target) {
     87         mNestedStopNestedScrollCalled = true;
     88     }
     89 
     90     public boolean stopNestedScrollCalled() {
     91         return mNestedStopNestedScrollCalled;
     92     }
     93 
     94     public void setNestedScrollMode(int mode) {
     95         mNestedScrollMode = mode;
     96     }
     97 
     98     public void setNestedFlingMode(int mode) {
     99         mNestedFlingMode = mode;
    100     }
    101 }
    102