core/tests/coretests/src/android/widget/listview/arrowscroll/ListWithOffScreenNextSelectableTest.java

/*
 * Copyright (C) 2007 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.widget.listview.arrowscroll;

import android.test.ActivityInstrumentationTestCase;
import android.test.suitebuilder.annotation.MediumTest;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.listview.ListWithOffScreenNextSelectable;

public class ListWithOffScreenNextSelectableTest
        extends ActivityInstrumentationTestCase<ListWithOffScreenNextSelectable> {
    private ListView mListView;

    public ListWithOffScreenNextSelectableTest() {
        super("com.android.frameworks.coretests", ListWithOffScreenNextSelectable.class);
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();

        mListView = getActivity().getListView();
    }

    @MediumTest
    public void testPreconditions() {
        assertNotNull(mListView);
        assertEquals(5, mListView.getAdapter().getCount());
        assertFalse(mListView.getAdapter().areAllItemsEnabled());
        assertFalse(mListView.getAdapter().isEnabled(1));
        assertFalse(mListView.getAdapter().isEnabled(2));
        assertFalse(mListView.getAdapter().isEnabled(3));
        assertEquals("only 4 children should be on screen (so that next selectable is off " +
                "screen) for this test to be meaningful.",
                4, mListView.getChildCount());
        assertEquals(0, mListView.getSelectedItemPosition());
    }

    // when the next items on screen are not selectable, we pan until the next selectable item
    // is (partially visible), then we jump to it
    @MediumTest
    public void testGoDownToOffScreenSelectable() {

        final int listBottom = mListView.getHeight() - mListView.getListPaddingBottom();

        final View lastVisibleView = mListView.getChildAt(mListView.getChildCount() - 1);
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        assertEquals("expecting view to be panned to just above fading edge",
                listBottom - mListView.getVerticalFadingEdgeLength(), lastVisibleView.getBottom());
        assertEquals("selection should not have moved yet",
                0, mListView.getSelectedItemPosition());
        
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        assertEquals("selection should have moved",
                4, mListView.getSelectedItemPosition());
        assertEquals("wrong view created when scrolling",
                getActivity().getValueAtPosition(4), ((TextView) mListView.getSelectedView()).getText());
        assertEquals(listBottom, mListView.getSelectedView().getBottom());
    }

    @MediumTest
    public void testGoUpToOffScreenSelectable() {
        final int listBottom = mListView.getHeight() - mListView.getListPaddingBottom();
        final int listTop = mListView.getListPaddingTop();

        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
        sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);

        assertEquals(4, mListView.getSelectedItemPosition());
        assertEquals(listBottom, mListView.getSelectedView().getBottom());

        // now we have the reverse situation: the next selectable position upward is off screen
        final View firstVisibleView = mListView.getChildAt(0);
        sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        assertEquals("should have panned top view just below vertical fading edge",
                listTop + mListView.getVerticalFadingEdgeLength(), firstVisibleView.getTop());
        assertEquals("selection should not have moved yet",
                4, mListView.getSelectedItemPosition());

        sendKeys(KeyEvent.KEYCODE_DPAD_UP);
        assertEquals("selection should have moved",
                0, mListView.getSelectedItemPosition());
        assertEquals(getActivity().getValueAtPosition(0),((TextView) mListView.getSelectedView()).getText());
        assertEquals(listTop, mListView.getSelectedView().getTop());

    }

}