1/* 2 * Copyright (C) 2014 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.view; 18 19import android.content.res.ColorStateList; 20import android.graphics.PorterDuff; 21import android.view.View; 22import android.view.ViewParent; 23 24import java.lang.reflect.Field; 25 26class ViewCompatBase { 27 28 private static final String TAG = "ViewCompatBase"; 29 30 private static Field sMinWidthField; 31 private static boolean sMinWidthFieldFetched; 32 private static Field sMinHeightField; 33 private static boolean sMinHeightFieldFetched; 34 35 static ColorStateList getBackgroundTintList(View view) { 36 return (view instanceof TintableBackgroundView) 37 ? ((TintableBackgroundView) view).getSupportBackgroundTintList() 38 : null; 39 } 40 41 static void setBackgroundTintList(View view, ColorStateList tintList) { 42 if (view instanceof TintableBackgroundView) { 43 ((TintableBackgroundView) view).setSupportBackgroundTintList(tintList); 44 } 45 } 46 47 static PorterDuff.Mode getBackgroundTintMode(View view) { 48 return (view instanceof TintableBackgroundView) 49 ? ((TintableBackgroundView) view).getSupportBackgroundTintMode() 50 : null; 51 } 52 53 static void setBackgroundTintMode(View view, PorterDuff.Mode mode) { 54 if (view instanceof TintableBackgroundView) { 55 ((TintableBackgroundView) view).setSupportBackgroundTintMode(mode); 56 } 57 } 58 59 static boolean isLaidOut(View view) { 60 return view.getWidth() > 0 && view.getHeight() > 0; 61 } 62 63 static int getMinimumWidth(View view) { 64 if (!sMinWidthFieldFetched) { 65 try { 66 sMinWidthField = View.class.getDeclaredField("mMinWidth"); 67 sMinWidthField.setAccessible(true); 68 } catch (NoSuchFieldException e) { 69 // Couldn't find the field. Abort! 70 } 71 sMinWidthFieldFetched = true; 72 } 73 74 if (sMinWidthField != null) { 75 try { 76 return (int) sMinWidthField.get(view); 77 } catch (Exception e) { 78 // Field get failed. Oh well... 79 } 80 } 81 82 // We failed, return 0 83 return 0; 84 } 85 86 static int getMinimumHeight(View view) { 87 if (!sMinHeightFieldFetched) { 88 try { 89 sMinHeightField = View.class.getDeclaredField("mMinHeight"); 90 sMinHeightField.setAccessible(true); 91 } catch (NoSuchFieldException e) { 92 // Couldn't find the field. Abort! 93 } 94 sMinHeightFieldFetched = true; 95 } 96 97 if (sMinHeightField != null) { 98 try { 99 return (int) sMinHeightField.get(view); 100 } catch (Exception e) { 101 // Field get failed. Oh well... 102 } 103 } 104 105 // We failed, return 0 106 return 0; 107 } 108 109 static boolean isAttachedToWindow(View view) { 110 return view.getWindowToken() != null; 111 } 112 113 static void offsetTopAndBottom(View view, int offset) { 114 final int currentTop = view.getTop(); 115 view.offsetTopAndBottom(offset); 116 117 if (offset != 0) { 118 // We need to manually invalidate pre-honeycomb 119 final ViewParent parent = view.getParent(); 120 if (parent instanceof View) { 121 final int absOffset = Math.abs(offset); 122 ((View) parent).invalidate( 123 view.getLeft(), 124 currentTop - absOffset, 125 view.getRight(), 126 currentTop + view.getHeight() + absOffset); 127 } else { 128 view.invalidate(); 129 } 130 } 131 } 132 133 static void offsetLeftAndRight(View view, int offset) { 134 final int currentLeft = view.getLeft(); 135 view.offsetLeftAndRight(offset); 136 137 if (offset != 0) { 138 // We need to manually invalidate pre-honeycomb 139 final ViewParent parent = view.getParent(); 140 if (parent instanceof View) { 141 final int absOffset = Math.abs(offset); 142 ((View) parent).invalidate( 143 currentLeft - absOffset, 144 view.getTop(), 145 currentLeft + view.getWidth() + absOffset, 146 view.getBottom()); 147 } else { 148 view.invalidate(); 149 } 150 } 151 } 152} 153