1 /* 2 * Copyright (C) 2007 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 */ 16 17 package android.widget.listview.arrowscroll; 18 19 import android.test.ActivityInstrumentationTestCase2; 20 import android.test.suitebuilder.annotation.MediumTest; 21 import android.view.KeyEvent; 22 import android.view.View; 23 import android.widget.ListView; 24 import android.widget.listview.ListOfItemsTallerThanScreen; 25 26 public class ListOfItemsTallerThanScreenTest 27 extends ActivityInstrumentationTestCase2<ListOfItemsTallerThanScreen> { 28 29 private ListView mListView; 30 private ListOfItemsTallerThanScreen mActivity; 31 32 33 protected void setUp() throws Exception { 34 super.setUp(); 35 mActivity = getActivity(); 36 mListView = getActivity().getListView(); 37 } 38 39 public ListOfItemsTallerThanScreenTest() { 40 super(ListOfItemsTallerThanScreen.class); 41 } 42 43 @MediumTest 44 public void testPreconditions() { 45 assertNotNull(mListView); 46 assertEquals("should only be one visible child", 1, mListView.getChildCount()); 47 final int amountOffScreen = mListView.getChildAt(0).getBottom() - (mListView.getBottom() - mListView.getListPaddingBottom()); 48 assertTrue("must be more than max scroll off screen for this test to work", 49 amountOffScreen > mListView.getMaxScrollAmount()); 50 } 51 52 @MediumTest 53 public void testScrollDownAcrossItem() { 54 final View view = mListView.getSelectedView(); 55 assertTrue(view.isSelected()); 56 57 assertEquals(mListView.getListPaddingTop(), 58 view.getTop()); 59 60 assertTrue("view must be taller than screen for this test to be worth anything", 61 view.getBottom() > mListView.getBottom()); 62 63 // scroll down until next view is peeking ahead 64 int numScrollsUntilNextViewVisible = getNumDownPressesToScrollDownAcrossSelected(); 65 66 for (int i = 0; i < numScrollsUntilNextViewVisible; i++) { 67 assertEquals("after " + i + " down scrolls across tall item", 68 mListView.getListPaddingTop() - mListView.getMaxScrollAmount() * i, 69 view.getTop()); 70 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 71 } 72 73 // at this point, next view should be on screen peeking ahead, but we haven't given 74 // it selection yet 75 assertEquals("child count", 2, mListView.getChildCount()); 76 assertEquals("selected position", 0, mListView.getSelectedItemPosition()); 77 assertTrue("same view should be selected", view.isSelected()); 78 final View peekingView = mListView.getChildAt(1); 79 assertEquals(view.getBottom(), peekingView.getTop()); 80 } 81 82 @MediumTest 83 public void testScrollDownToNextItem() { 84 final int numPresses = getNumDownPressesToScrollDownAcrossSelected(); 85 assertEquals(1, mListView.getChildCount()); 86 87 for (int i = 0; i < numPresses; i++) { 88 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 89 } 90 // remember top of peeking child 91 final int topOfPeekingNext = mListView.getChildAt(1).getTop(); 92 93 // next view is peeking, now press one more time 94 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 95 96 // old view should not have selection 97 assertFalse(mListView.getChildAt(0).isSelected()); 98 99 // next view should now have selection, and be scrolled another a third of the list 100 // height 101 assertEquals(2, mListView.getChildCount()); 102 final View next = mListView.getChildAt(1); 103 assertTrue("has selection", next.isSelected()); 104 assertEquals(topOfPeekingNext - (mListView.getMaxScrollAmount()), next.getTop()); 105 } 106 107 @MediumTest 108 public void testScrollFirstItemOffScreen() { 109 int numDownsToGetFirstItemOffScreen = 110 (mListView.getSelectedView().getHeight() / mListView.getMaxScrollAmount()) + 1; 111 112 for (int i = 0; i < numDownsToGetFirstItemOffScreen; i++) { 113 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 114 } 115 getInstrumentation().waitForIdleSync(); 116 117 assertEquals("should be at next item", 118 1, mListView.getSelectedItemPosition()); 119 120 final int listTop = mListView.getTop() + mListView.getListPaddingTop(); 121 assertTrue("top of selected view should be above top of list", 122 mListView.getSelectedView().getTop() < listTop); 123 124 assertEquals("off screen item shouldn't be a child of list view", 125 1, mListView.getChildCount()); 126 } 127 128 @MediumTest 129 public void testScrollDownToLastItem() { 130 final int numItems = mListView.getAdapter().getCount(); 131 132 int maxDowns = 20; 133 while (mListView.getSelectedItemPosition() < (numItems - 1)) { 134 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 135 if (--maxDowns <= 0) { 136 fail("couldn't get to last item within 20 down arrows"); 137 } 138 } 139 getInstrumentation().waitForIdleSync(); 140 141 // press down enough times to get to bottom of last item 142 final int numDownsLeft = getNumDownPressesToScrollDownAcrossSelected(); 143 assertTrue(numDownsLeft > 0); 144 for (int i = 0; i < numDownsLeft; i++) { 145 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 146 } 147 // one more time to get across last item 148 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 149 getInstrumentation().waitForIdleSync(); 150 151 assertEquals(numItems - 1, mListView.getSelectedItemPosition()); 152 final int realBottom = mListView.getHeight() - mListView.getListPaddingBottom(); 153 assertEquals(realBottom, mListView.getSelectedView().getBottom()); 154 155 assertEquals("views scrolled off screen should be removed from view group", 156 1, mListView.getChildCount()); 157 } 158 159 @MediumTest 160 public void testScrollUpAcrossFirstItem() { 161 final int listTop = mListView.getListPaddingTop(); 162 assertEquals(listTop, mListView.getSelectedView().getTop()); 163 final int numPresses = getNumDownPressesToScrollDownAcrossSelected(); 164 for (int i = 0; i < numPresses; i++) { 165 sendKeys(KeyEvent.KEYCODE_DPAD_DOWN); 166 } 167 assertEquals(2, mListView.getChildCount()); 168 for (int i = 0; i < numPresses; i++) { 169 sendKeys(KeyEvent.KEYCODE_DPAD_UP); 170 assertEquals(1, mListView.getChildCount()); 171 } 172 assertEquals(listTop, mListView.getSelectedView().getTop()); 173 } 174 175 /** 176 * Assuming the selected view is overlapping the bottom edge, how many times 177 * do I have to press down to get beyond it so that either: 178 * a) the next view is peeking in 179 * b) the selected view is the last item in the list, and we are scrolled to the bottom 180 * @return 181 */ 182 private int getNumDownPressesToScrollDownAcrossSelected() { 183 View selected = mListView.getSelectedView(); 184 int realBottom = mListView.getBottom() - mListView.getListPaddingBottom(); 185 assertTrue("view should be overlapping bottom", 186 selected.getBottom() > realBottom); 187 assertTrue("view should be overlapping bottom", 188 selected.getTop() < realBottom); 189 190 int pixelsOffScreen = selected.getBottom() - realBottom; 191 return (pixelsOffScreen / mListView.getMaxScrollAmount()) + 1; 192 } 193 194 } 195
