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      1 /*
      2 * Copyright (C) 2016 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.view;
     18 
     19 import android.content.Context;
     20 import android.support.test.InstrumentationRegistry;
     21 import android.support.test.runner.AndroidJUnit4;
     22 import android.test.ActivityInstrumentationTestCase2;
     23 import android.util.DisplayMetrics;
     24 import android.view.PinchZoomAction;
     25 import android.view.ScaleGesture;
     26 import android.view.WindowManager;
     27 import android.widget.TextView;
     28 
     29 import com.android.frameworks.coretests.R;
     30 
     31 import org.junit.After;
     32 import org.junit.Before;
     33 import org.junit.Test;
     34 import org.junit.runner.RunWith;
     35 
     36 import static android.support.test.espresso.matcher.ViewMatchers.withId;
     37 import static android.support.test.espresso.Espresso.onView;
     38 
     39 public class ScaleGestureDetectorTest extends ActivityInstrumentationTestCase2<ScaleGesture> {
     40     private ScaleGesture mScaleGestureActivity;
     41 
     42     public ScaleGestureDetectorTest() {
     43         super("com.android.frameworks.coretests", ScaleGesture.class);
     44     }
     45 
     46     @Before
     47     public void setUp() throws Exception {
     48         super.setUp();
     49         injectInstrumentation(InstrumentationRegistry.getInstrumentation());
     50         mScaleGestureActivity = getActivity();
     51     }
     52 
     53     @After
     54     public void tearDown() throws Exception {
     55         super.tearDown();
     56     }
     57 
     58     @Test
     59     public void testScaleGestureDetector() {
     60         // No scaling should have occurred prior to performing pinch zoom action.
     61         final float initialScaleFactor = 1.0f;
     62         assertEquals(initialScaleFactor, mScaleGestureActivity.getScaleFactor());
     63 
     64         // Specify start and end coordinates, irrespective of device display size.
     65         final DisplayMetrics dm = new DisplayMetrics();
     66         final WindowManager wm = (WindowManager) (mScaleGestureActivity.getApplicationContext())
     67                 .getSystemService(Context.WINDOW_SERVICE);
     68         wm.getDefaultDisplay().getMetrics(dm);
     69         final int displayWidth = dm.widthPixels;
     70         final int displayHeight = dm.heightPixels;
     71 
     72         // Obtain coordinates to perform pinch and zoom from the center, to 75% of the display.
     73         final int centerX = displayWidth / 2;
     74         final int centerY = displayHeight / 2;
     75 
     76         // Offset center coordinates by one, so that the two starting points are different.
     77         final float[] firstFingerStartCoords = new float[] {centerX + 1.0f, centerY - 1.0f};
     78         final float[] firstFingerEndCoords =
     79         new float[] {0.75f * displayWidth, 0.25f * displayHeight};
     80         final float[] secondFingerStartCoords = new float[] {centerX - 1.0f, centerY + 1.0f};
     81         final float[] secondFingerEndCoords =
     82         new float[] {0.25f * displayWidth, 0.75f * displayHeight};
     83 
     84         onView(withId(R.id.article)).perform(new PinchZoomAction(firstFingerStartCoords,
     85                 firstFingerEndCoords, secondFingerStartCoords, secondFingerEndCoords,
     86                 TextView.class));
     87 
     88         // Text should have been 'zoomed', meaning scale factor increased.
     89         assertTrue(mScaleGestureActivity.getScaleFactor() > initialScaleFactor);
     90     }
     91 }