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 */
16package com.android.dialer;
17
18import android.content.Context;
19import android.support.design.widget.CoordinatorLayout;
20import android.support.design.widget.Snackbar.SnackbarLayout;
21import android.util.AttributeSet;
22import android.view.View;
23import android.widget.FrameLayout;
24
25/**
26 * Implements custom behavior for the movement of the FAB in response to the Snackbar.
27 * Because we are not using the design framework FloatingActionButton widget, we need to manually
28 * implement the Material Design behavior of having the FAB translate upward and downward with
29 * the appearance and disappearance of a Snackbar.
30 */
31public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FrameLayout> {
32    public FloatingActionButtonBehavior(Context context, AttributeSet attrs) {
33    }
34
35    @Override
36    public boolean layoutDependsOn(CoordinatorLayout parent, FrameLayout child, View dependency) {
37        return dependency instanceof SnackbarLayout;
38    }
39
40    @Override
41    public boolean onDependentViewChanged(CoordinatorLayout parent, FrameLayout child,
42            View dependency) {
43        float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight());
44        child.setTranslationY(translationY);
45        return true;
46    }
47}
48