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 17 package com.android.contacts.util; 18 19 import android.content.res.Resources; 20 import android.graphics.Outline; 21 import android.view.View; 22 import android.view.ViewGroup; 23 import android.view.ViewOutlineProvider; 24 import android.widget.ListView; 25 26 import com.android.contacts.R; 27 import com.android.contacts.compat.CompatUtils; 28 29 /** 30 * Provides static functions to work with views 31 */ 32 public class ViewUtil { ViewUtil()33 private ViewUtil() {} 34 35 /** 36 * Returns the width as specified in the LayoutParams 37 * @throws IllegalStateException Thrown if the view's width is unknown before a layout pass 38 * s 39 */ getConstantPreLayoutWidth(View view)40 public static int getConstantPreLayoutWidth(View view) { 41 // We haven't been layed out yet, so get the size from the LayoutParams 42 final ViewGroup.LayoutParams p = view.getLayoutParams(); 43 if (p.width < 0) { 44 throw new IllegalStateException("Expecting view's width to be a constant rather " + 45 "than a result of the layout pass"); 46 } 47 return p.width; 48 } 49 50 /** 51 * Returns a boolean indicating whether or not the view's layout direction is RTL 52 * 53 * @param view - A valid view 54 * @return True if the view's layout direction is RTL 55 */ isViewLayoutRtl(View view)56 public static boolean isViewLayoutRtl(View view) { 57 return view.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL; 58 } 59 60 private static final ViewOutlineProvider OVAL_OUTLINE_PROVIDER; 61 static { 62 if (CompatUtils.isLollipopCompatible()) { 63 OVAL_OUTLINE_PROVIDER = new ViewOutlineProvider() { 64 @Override 65 public void getOutline(View view, Outline outline) { 66 outline.setOval(0, 0, view.getWidth(), view.getHeight()); 67 } 68 }; 69 } else { 70 OVAL_OUTLINE_PROVIDER = null; 71 } 72 } 73 74 private static final ViewOutlineProvider RECT_OUTLINE_PROVIDER; 75 static { 76 if (CompatUtils.isLollipopCompatible()) { 77 RECT_OUTLINE_PROVIDER = new ViewOutlineProvider() { 78 @Override 79 public void getOutline(View view, Outline outline) { 80 outline.setRect(0, 0, view.getWidth(), view.getHeight()); 81 } 82 }; 83 } else { 84 RECT_OUTLINE_PROVIDER = null; 85 } 86 } 87 88 /** 89 * Adds a rectangular outline to a view. This can be useful when you want to add a shadow 90 * to a transparent view. See b/16856049. 91 * @param view view that the outline is added to 92 * @param res The resources file. 93 */ addRectangularOutlineProvider(View view, Resources res)94 public static void addRectangularOutlineProvider(View view, Resources res) { 95 if (CompatUtils.isLollipopCompatible()) { 96 view.setOutlineProvider(RECT_OUTLINE_PROVIDER); 97 } 98 } 99 100 /** 101 * Configures the floating action button, clipping it to a circle and setting its translation z. 102 * @param view The float action button's view. 103 * @param res The resources file. 104 */ setupFloatingActionButton(View view, Resources res)105 public static void setupFloatingActionButton(View view, Resources res) { 106 if (CompatUtils.isLollipopCompatible()) { 107 view.setOutlineProvider(OVAL_OUTLINE_PROVIDER); 108 view.setTranslationZ( 109 res.getDimensionPixelSize(R.dimen.floating_action_button_translation_z)); 110 } 111 } 112 113 /** 114 * Adds padding to the bottom of the given {@link ListView} so that the floating action button 115 * does not obscure any content. 116 * 117 * @param listView to add the padding to 118 * @param res valid resources object 119 */ addBottomPaddingToListViewForFab(ListView listView, Resources res)120 public static void addBottomPaddingToListViewForFab(ListView listView, Resources res) { 121 final int fabPadding = res.getDimensionPixelSize( 122 R.dimen.floating_action_button_list_bottom_padding); 123 listView.setPaddingRelative(listView.getPaddingStart(), listView.getPaddingTop(), 124 listView.getPaddingEnd(), listView.getPaddingBottom() + fabPadding); 125 listView.setClipToPadding(false); 126 } 127 } 128