AppBarWithAnchoredFabMarginsTest.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.widget;

import static org.junit.Assert.assertEquals;

import android.support.design.test.R;
import android.support.test.filters.SmallTest;

import org.junit.Before;
import org.junit.Test;

@SmallTest
public class AppBarWithAnchoredFabMarginsTest extends AppBarLayoutBaseTest {
    private int mFabMargin;

    @Before
    public void setup() {
        mFabMargin = mActivityTestRule.getActivity().getResources().getDimensionPixelSize(
                R.dimen.fab_margin);
    }

    @Test
    public void testFabBottomMargin() throws Throwable {
        configureContent(R.layout.design_appbar_anchored_fab_margin_bottom,
                R.string.design_appbar_anchored_fab_margin_bottom);

        final FloatingActionButton fab =
                (FloatingActionButton) mCoordinatorLayout.findViewById(R.id.fab);
        final CoordinatorLayout.LayoutParams fabLp =
                (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
        assertEquals(mAppBar.getId(), fabLp.getAnchorId());

        final int[] appbarOnScreenXY = new int[2];
        final int[] fabOnScreenXY = new int[2];
        mAppBar.getLocationOnScreen(appbarOnScreenXY);
        fab.getLocationOnScreen(fabOnScreenXY);

        // FAB is horizontally centered in the coordinate system of its anchor (app bar).
        assertEquals(appbarOnScreenXY[0] + mAppBar.getWidth() / 2,
                fabOnScreenXY[0] + fab.getWidth() / 2, 1);
        // Bottom margin is in the coordinate space of the parent (CoordinatorLayout) and not
        // the anchor. Since our FAB is far enough from the bottom edge of CoordinatorLayout,
        // we are expecting the vertical center of the FAB to be aligned with the bottom edge
        // of its anchor (app bar).
        assertEquals(appbarOnScreenXY[1] + mAppBar.getHeight(),
                fabOnScreenXY[1] + fab.getHeight() / 2, 1);
    }

    @Test
    public void testFabTopMargin() throws Throwable {
        configureContent(R.layout.design_appbar_anchored_fab_margin_top,
                R.string.design_appbar_anchored_fab_margin_top);

        final FloatingActionButton fab =
                (FloatingActionButton) mCoordinatorLayout.findViewById(R.id.fab);
        final CoordinatorLayout.LayoutParams fabLp =
                (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
        assertEquals(mAppBar.getId(), fabLp.getAnchorId());

        final int[] appbarOnScreenXY = new int[2];
        final int[] fabOnScreenXY = new int[2];
        mAppBar.getLocationOnScreen(appbarOnScreenXY);
        fab.getLocationOnScreen(fabOnScreenXY);

        // FAB is horizontally centered in the coordinate system of its anchor (app bar).
        assertEquals(appbarOnScreenXY[0] + mAppBar.getWidth() / 2,
                fabOnScreenXY[0] + fab.getWidth() / 2, 1);
        // Top margin is in the coordinate space of the parent (CoordinatorLayout) and not
        // the anchor. Since our FAB is far enough from the bottom edge of CoordinatorLayout,
        // we are expecting the vertical center of the FAB to be aligned with the bottom edge
        // of its anchor (app bar).
        assertEquals(appbarOnScreenXY[1] + mAppBar.getHeight(),
                fabOnScreenXY[1] + fab.getHeight() / 2, 1);
    }

    @Test
    public void testFabLeftMargin() throws Throwable {
        configureContent(R.layout.design_appbar_anchored_fab_margin_left,
                R.string.design_appbar_anchored_fab_margin_left);

        final FloatingActionButton fab =
                (FloatingActionButton) mCoordinatorLayout.findViewById(R.id.fab);
        final CoordinatorLayout.LayoutParams fabLp =
                (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
        assertEquals(mAppBar.getId(), fabLp.getAnchorId());

        final int[] appbarOnScreenXY = new int[2];
        final int[] fabOnScreenXY = new int[2];
        mAppBar.getLocationOnScreen(appbarOnScreenXY);
        fab.getLocationOnScreen(fabOnScreenXY);

        // FAB is left-aligned in the coordinate system of its anchor (app bar). In addition,
        // its left margin "pushes" it away in the coordinate system of the parent
        // (CoordinatorLayout)
        assertEquals(appbarOnScreenXY[0] + mFabMargin, fabOnScreenXY[0], 1);
        // FAB's vertical center should be aligned with the bottom edge of its anchor (app bar).
        assertEquals(appbarOnScreenXY[1] + mAppBar.getHeight(),
                fabOnScreenXY[1] + fab.getHeight() / 2, 1);
    }

    @Test
    public void testFabRightMargin() throws Throwable {
        configureContent(R.layout.design_appbar_anchored_fab_margin_right,
                R.string.design_appbar_anchored_fab_margin_right);

        final FloatingActionButton fab =
                (FloatingActionButton) mCoordinatorLayout.findViewById(R.id.fab);
        final CoordinatorLayout.LayoutParams fabLp =
                (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
        assertEquals(mAppBar.getId(), fabLp.getAnchorId());

        final int[] appbarOnScreenXY = new int[2];
        final int[] fabOnScreenXY = new int[2];
        mAppBar.getLocationOnScreen(appbarOnScreenXY);
        fab.getLocationOnScreen(fabOnScreenXY);

        // FAB is right-aligned in the coordinate system of its anchor (app bar). In addition,
        // its right margin "pushes" it away in the coordinate system of the parent
        // (CoordinatorLayout)
        assertEquals(appbarOnScreenXY[0] + mAppBar.getWidth() - mFabMargin,
                fabOnScreenXY[0] + fab.getWidth(), 1);
        // FAB's vertical center should be aligned with the bottom edge of its anchor (app bar).
        assertEquals(appbarOnScreenXY[1] + mAppBar.getHeight(),
                fabOnScreenXY[1] + fab.getHeight() / 2, 1);
    }
}