design/tests/src/android/support/design/custom/TestFloatingBehavior.java

/*
 * Copyright (C) 2016 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 android.support.design.custom;

import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.View;
import android.widget.TextView;

public class TestFloatingBehavior extends CoordinatorLayout.Behavior<TextView> {
    // Default constructor is needed to instantiate a Behavior object when it is attached
    // to custom view class as class-level annotation
    public TestFloatingBehavior() {
    }

    // This constructor is needed to instantiate a Behavior object when it is attached to a
    // view via layout_behavior XML attribute
    public TestFloatingBehavior(Context context, AttributeSet attrs) {
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, TextView child, View dependency) {
        return dependency instanceof Snackbar.SnackbarLayout;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, TextView child,
            View dependency) {
        ViewCompat.setTranslationY(child, Math.min(0,
                ViewCompat.getTranslationY(dependency) - dependency.getHeight()));
        return true;
    }
}