1/* 2 * Copyright (C) 2012 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 17package android.support.v7.widget; 18 19import android.content.Context; 20import android.os.Build; 21import android.util.AttributeSet; 22import android.view.View; 23 24/** 25 * Custom ViewGroup providing some services to the support implementation of GridLayout. 26 * 27 */ 28abstract class ViewGroup extends android.view.ViewGroup { 29 30 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 31 super(context, attrs, defStyle); 32 } 33 34 protected static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 35 36 /** 37 * Bits of {@link #getMeasuredWidthAndState()} and 38 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 39 */ 40 protected static final int MEASURED_STATE_MASK = 0xff000000; 41 42 /** 43 * Utility to reconcile a desired size and state, with constraints imposed 44 * by a MeasureSpec. Will take the desired size, unless a different size 45 * is imposed by the constraints. The returned value is a compound integer, 46 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 47 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 48 * size is smaller than the size the view wants to be. 49 * 50 * @param size How big the view wants to be 51 * @param measureSpec Constraints imposed by the parent 52 * @return Size information bit mask as defined by 53 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 54 */ 55 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 56 if (Build.VERSION.SDK_INT >= 11) { 57 return View.resolveSizeAndState(size, measureSpec, childMeasuredState); 58 } 59 int result = size; 60 int specMode = MeasureSpec.getMode(measureSpec); 61 int specSize = MeasureSpec.getSize(measureSpec); 62 switch (specMode) { 63 case MeasureSpec.UNSPECIFIED: 64 result = size; 65 break; 66 case MeasureSpec.AT_MOST: 67 if (specSize < size) { 68 result = specSize | MEASURED_STATE_TOO_SMALL; 69 } else { 70 result = size; 71 } 72 break; 73 case MeasureSpec.EXACTLY: 74 result = specSize; 75 break; 76 } 77 return result | (childMeasuredState&MEASURED_STATE_MASK); 78 } 79 80 protected static boolean isLayoutRtl(View view) { 81 return false; 82 } 83} 84