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