1/* 2 * Copyright (C) 2016 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 */ 16package android.support.design.custom; 17 18import android.content.Context; 19import android.support.design.widget.CoordinatorLayout; 20import android.support.design.widget.Snackbar; 21import android.util.AttributeSet; 22import android.view.View; 23import android.widget.TextView; 24 25public class TestFloatingBehavior extends CoordinatorLayout.Behavior<TextView> { 26 // Default constructor is needed to instantiate a Behavior object when it is attached 27 // to custom view class as class-level annotation 28 public TestFloatingBehavior() { 29 } 30 31 // This constructor is needed to instantiate a Behavior object when it is attached to a 32 // view via layout_behavior XML attribute 33 public TestFloatingBehavior(Context context, AttributeSet attrs) { 34 } 35 36 @Override 37 public boolean layoutDependsOn(CoordinatorLayout parent, TextView child, View dependency) { 38 return dependency instanceof Snackbar.SnackbarLayout; 39 } 40 41 @Override 42 public boolean onDependentViewChanged(CoordinatorLayout parent, TextView child, 43 View dependency) { 44 child.setTranslationY(Math.min(0, 45 dependency.getTranslationY() - dependency.getHeight())); 46 return true; 47 } 48} 49