content: /*
   * Copyright (C) 2017 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 com.android.server.autofill.ui;
  
  import static com.android.server.autofill.Helper.sDebug;
  
  import android.content.Context;
  import android.graphics.Point;
  import android.util.AttributeSet;
  import android.util.Slog;
  import android.util.TypedValue;
  import android.view.View;
  import android.widget.ScrollView;
  
  import com.android.internal.R;
  
  /**
   * Custom scroll view that stretches to a maximum height.
   */
  public class CustomScrollView extends ScrollView {
  
      private static final String TAG = "CustomScrollView";
  
      private int mWidth = -1;
      private int mHeight = -1;
  
      public CustomScrollView(Context context) {
          super(context);
      }
  
      public CustomScrollView(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public CustomScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
          super(context, attrs, defStyleAttr);
      }
  
      public CustomScrollView(Context context, AttributeSet attrs, int defStyleAttr,
              int defStyleRes) {
          super(context, attrs, defStyleAttr, defStyleRes);
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  
          if (getChildCount() == 0) {
              // Should not happen
              Slog.e(TAG, "no children");
              return;
          }
  
          calculateDimensions();
          setMeasuredDimension(mWidth, mHeight);
      }
  
      private void calculateDimensions() {
          if (mWidth != -1) return;
  
          final TypedValue typedValue = new TypedValue();
          final Point point = new Point();
          final Context context = getContext();
          context.getDisplay().getSize(point);
          context.getTheme().resolveAttribute(R.attr.autofillSaveCustomSubtitleMaxHeight,
                  typedValue, true);
          final View child = getChildAt(0);
          final int childHeight = child.getMeasuredHeight();
          final int maxHeight = (int) typedValue.getFraction(point.y, point.y);
  
          mWidth = point.x;
          mHeight = Math.min(childHeight, maxHeight);
          if (sDebug) {
              Slog.d(TAG, "calculateDimensions(): maxHeight=" + maxHeight
                      + ", childHeight=" + childHeight + ", w=" + mWidth + ", h=" + mHeight);
          }
      }
  }
  