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 17 package com.android.documentsui; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.widget.ImageView; 22 23 /** 24 * Ensures that grid thumbnails are always square. 25 */ 26 public class GridItemThumbnail extends ImageView { 27 public GridItemThumbnail(Context context) { 28 super(context); 29 } 30 31 public GridItemThumbnail(Context context, AttributeSet attrs) { 32 super(context, attrs); 33 } 34 35 public GridItemThumbnail(Context context, AttributeSet attrs, int defStyle) { 36 super(context, attrs, defStyle); 37 } 38 39 @Override 40 public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 41 // Grid layout uses item width to figure out the number of columns, then dynamically fits 42 // rows into the view. The upshot of this is that changing the item width will mess up the 43 // grid layout - so to make the items square, throw out the height and use the width for 44 // both dimensions. The grid layout will correctly adjust the row height. 45 // 46 // Note that this code will need to be changed if the layout manager's orientation is 47 // changed from VERTICAL to HORIZONTAL. 48 super.onMeasure(widthMeasureSpec, widthMeasureSpec); 49 } 50 } 51
