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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"); you may not
      5  * use this file except in compliance with the License. You may obtain a copy of
      6  * 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, WITHOUT
     12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
     13  * License for the specific language governing permissions and limitations under
     14  * the License.
     15  */
     16 
     17 package android.text;
     18 
     19 import static org.junit.Assert.assertEquals;
     20 import static org.junit.Assert.assertTrue;
     21 
     22 import android.support.test.filters.SmallTest;
     23 import android.support.test.runner.AndroidJUnit4;
     24 import android.text.Layout.Alignment;
     25 
     26 import org.junit.Before;
     27 import org.junit.Test;
     28 import org.junit.runner.RunWith;
     29 
     30 /**
     31  * Tests for text measuring methods of StaticLayout.
     32  */
     33 @SmallTest
     34 @RunWith(AndroidJUnit4.class)
     35 public class StaticLayoutTextMeasuringTest {
     36     private static final float SPACE_MULTI = 1.0f;
     37     private static final float SPACE_ADD = 0.0f;
     38     private static final int DEFAULT_OUTER_WIDTH = 150;
     39     private static final Alignment DEFAULT_ALIGN = Alignment.ALIGN_LEFT;
     40 
     41     private TextPaint mDefaultPaint;
     42 
     43     @Before
     44     public void setup() {
     45         if (mDefaultPaint == null) {
     46             mDefaultPaint = new TextPaint();
     47         }
     48     }
     49 
     50     @Test
     51     public void testGetPrimaryHorizontal_zwnbsp() {
     52         // a, ZERO WIDTH NO-BREAK SPACE
     53         String testString = "a\uFEFF";
     54         StaticLayout layout = new StaticLayout(testString, mDefaultPaint,
     55                 DEFAULT_OUTER_WIDTH, DEFAULT_ALIGN, SPACE_MULTI, SPACE_ADD, true);
     56 
     57         assertEquals(0.0f, layout.getPrimaryHorizontal(0), 0f);
     58         assertEquals(layout.getPrimaryHorizontal(2), layout.getPrimaryHorizontal(1), 0f);
     59     }
     60 
     61     @Test
     62     public void testGetPrimaryHorizontal_devanagari() {
     63         // DEVANAGARI LETTER KA, DEVANAGARI VOWEL SIGN AA
     64         String testString = "\u0915\u093E";
     65         StaticLayout layout = new StaticLayout(testString, mDefaultPaint,
     66                 DEFAULT_OUTER_WIDTH, DEFAULT_ALIGN, SPACE_MULTI, SPACE_ADD, true);
     67 
     68         assertEquals(0.0f, layout.getPrimaryHorizontal(0), 0f);
     69         assertEquals(layout.getPrimaryHorizontal(2), layout.getPrimaryHorizontal(1), 0f);
     70     }
     71 
     72     @Test
     73     public void testGetPrimaryHorizontal_flagEmoji() {
     74         // REGIONAL INDICATOR SYMBOL LETTER U, REGIONAL INDICATOR SYMBOL LETTER S, REGIONAL
     75         // INDICATOR SYMBOL LETTER Z
     76         // First two code points (U and S) forms a US flag.
     77         String testString = "\uD83C\uDDFA\uD83C\uDDF8\uD83C\uDDFF";
     78         StaticLayout layout = new StaticLayout(testString, mDefaultPaint,
     79                 DEFAULT_OUTER_WIDTH, DEFAULT_ALIGN, SPACE_MULTI, SPACE_ADD, true);
     80 
     81         assertEquals(0.0f, layout.getPrimaryHorizontal(0), 0f);
     82         assertEquals(layout.getPrimaryHorizontal(4), layout.getPrimaryHorizontal(1), 0f);
     83         assertEquals(layout.getPrimaryHorizontal(4), layout.getPrimaryHorizontal(2), 0f);
     84         assertEquals(layout.getPrimaryHorizontal(4), layout.getPrimaryHorizontal(3), 0f);
     85 
     86         assertTrue(layout.getPrimaryHorizontal(6) > layout.getPrimaryHorizontal(4));
     87         assertEquals(layout.getPrimaryHorizontal(6), layout.getPrimaryHorizontal(5), 0f);
     88     }
     89 }
     90