1 /* 2 * Copyright (C) 2015 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 package com.android.messaging.ui; 17 18 import android.content.Context; 19 import android.content.res.TypedArray; 20 import android.util.AttributeSet; 21 import android.widget.ScrollView; 22 23 import com.android.messaging.R; 24 25 /** 26 * A ScrollView that limits the maximum height that it can take. This is to work around android 27 * layout's limitation of not having android:maxHeight. 28 */ 29 public class MaxHeightScrollView extends ScrollView { 30 private static final int NO_MAX_HEIGHT = -1; 31 32 private final int mMaxHeight; 33 MaxHeightScrollView(final Context context, final AttributeSet attrs)34 public MaxHeightScrollView(final Context context, final AttributeSet attrs) { 35 super(context, attrs); 36 final TypedArray attr = context.obtainStyledAttributes(attrs, 37 R.styleable.MaxHeightScrollView, 0, 0); 38 mMaxHeight = attr.getDimensionPixelSize(R.styleable.MaxHeightScrollView_android_maxHeight, 39 NO_MAX_HEIGHT); 40 attr.recycle(); 41 } 42 43 @Override onMeasure(final int widthMeasureSpec, final int heightMeasureSpec)44 protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) { 45 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 46 if (mMaxHeight != NO_MAX_HEIGHT) { 47 setMeasuredDimension(getMeasuredWidth(), Math.min(getMeasuredHeight(), mMaxHeight)); 48 } 49 } 50 }