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 17package android.support.v4.widget; 18 19import android.content.Context; 20import android.graphics.Canvas; 21import android.util.AttributeSet; 22import android.view.View; 23 24/** 25 * Space is a lightweight {@link View} subclass that may be used to create gaps between components 26 * in general purpose layouts. 27 */ 28public class Space extends View { 29 30 public Space(Context context, AttributeSet attrs, int defStyle) { 31 super(context, attrs, defStyle); 32 if (getVisibility() == VISIBLE) { 33 setVisibility(INVISIBLE); 34 } 35 } 36 37 public Space(Context context, AttributeSet attrs) { 38 this(context, attrs, 0); 39 } 40 41 public Space(Context context) { 42 this(context, null); 43 } 44 45 /** 46 * Draw nothing. 47 * 48 * @param canvas an unused parameter. 49 */ 50 @Override 51 public void draw(Canvas canvas) { 52 } 53 54 /** 55 * Compare to: {@link View#getDefaultSize(int, int)} 56 * If mode is AT_MOST, return the child size instead of the parent size 57 * (unless it is too big). 58 */ 59 private static int getDefaultSize2(int size, int measureSpec) { 60 int result = size; 61 int specMode = MeasureSpec.getMode(measureSpec); 62 int specSize = MeasureSpec.getSize(measureSpec); 63 64 switch (specMode) { 65 case MeasureSpec.UNSPECIFIED: 66 result = size; 67 break; 68 case MeasureSpec.AT_MOST: 69 result = Math.min(size, specSize); 70 break; 71 case MeasureSpec.EXACTLY: 72 result = specSize; 73 break; 74 } 75 return result; 76 } 77 78 @Override 79 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 80 setMeasuredDimension( 81 getDefaultSize2(getSuggestedMinimumWidth(), widthMeasureSpec), 82 getDefaultSize2(getSuggestedMinimumHeight(), heightMeasureSpec)); 83 } 84}