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      1 /*
      2  * Copyright (C) 2015 Google Inc.
      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 androidx.appcompat.widget;
     18 
     19 import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;
     20 
     21 import android.content.Context;
     22 import android.content.res.TypedArray;
     23 import android.text.Layout;
     24 import android.util.AttributeSet;
     25 import android.util.TypedValue;
     26 import android.widget.TextView;
     27 
     28 import androidx.annotation.RestrictTo;
     29 import androidx.appcompat.R;
     30 
     31 /**
     32  * Used by dialogs to change the font size and number of lines to try to fit
     33  * the text to the available space.
     34  *
     35  * @hide
     36  */
     37 @RestrictTo(LIBRARY_GROUP)
     38 public class DialogTitle extends TextView {
     39 
     40     public DialogTitle(Context context, AttributeSet attrs, int defStyleAttr) {
     41         super(context, attrs, defStyleAttr);
     42     }
     43 
     44     public DialogTitle(Context context, AttributeSet attrs) {
     45         super(context, attrs);
     46     }
     47 
     48     public DialogTitle(Context context) {
     49         super(context);
     50     }
     51 
     52     @Override
     53     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     54         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     55 
     56         final Layout layout = getLayout();
     57         if (layout != null) {
     58             final int lineCount = layout.getLineCount();
     59             if (lineCount > 0) {
     60                 final int ellipsisCount = layout.getEllipsisCount(lineCount - 1);
     61                 if (ellipsisCount > 0) {
     62                     setSingleLine(false);
     63                     setMaxLines(2);
     64 
     65                     final TypedArray a = getContext().obtainStyledAttributes(null,
     66                             R.styleable.TextAppearance,
     67                             android.R.attr.textAppearanceMedium,
     68                             android.R.style.TextAppearance_Medium);
     69                     final int textSize = a.getDimensionPixelSize(
     70                             R.styleable.TextAppearance_android_textSize, 0);
     71                     if (textSize != 0) {
     72                         // textSize is already expressed in pixels
     73                         setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
     74                     }
     75                     a.recycle();
     76 
     77                     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     78                 }
     79             }
     80         }
     81     }
     82 }