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; 22 23import java.lang.reflect.Field; 24 25class ViewCompatBase { 26 27 private static final String TAG = "ViewCompatBase"; 28 29 private static Field sMinWidthField; 30 private static boolean sMinWidthFieldFetched; 31 private static Field sMinHeightField; 32 private static boolean sMinHeightFieldFetched; 33 34 static ColorStateList getBackgroundTintList(View view) { 35 return (view instanceof TintableBackgroundView) 36 ? ((TintableBackgroundView) view).getSupportBackgroundTintList() 37 : null; 38 } 39 40 static void setBackgroundTintList(View view, ColorStateList tintList) { 41 if (view instanceof TintableBackgroundView) { 42 ((TintableBackgroundView) view).setSupportBackgroundTintList(tintList); 43 } 44 } 45 46 static PorterDuff.Mode getBackgroundTintMode(View view) { 47 return (view instanceof TintableBackgroundView) 48 ? ((TintableBackgroundView) view).getSupportBackgroundTintMode() 49 : null; 50 } 51 52 static void setBackgroundTintMode(View view, PorterDuff.Mode mode) { 53 if (view instanceof TintableBackgroundView) { 54 ((TintableBackgroundView) view).setSupportBackgroundTintMode(mode); 55 } 56 } 57 58 static boolean isLaidOut(View view) { 59 return view.getWidth() > 0 && view.getHeight() > 0; 60 } 61 62 static int getMinimumWidth(View view) { 63 if (!sMinWidthFieldFetched) { 64 try { 65 sMinWidthField = View.class.getDeclaredField("mMinWidth"); 66 sMinWidthField.setAccessible(true); 67 } catch (NoSuchFieldException e) { 68 // Couldn't find the field. Abort! 69 } 70 sMinWidthFieldFetched = true; 71 } 72 73 if (sMinWidthField != null) { 74 try { 75 return (int) sMinWidthField.get(view); 76 } catch (Exception e) { 77 // Field get failed. Oh well... 78 } 79 } 80 81 // We failed, return 0 82 return 0; 83 } 84 85 static int getMinimumHeight(View view) { 86 if (!sMinHeightFieldFetched) { 87 try { 88 sMinHeightField = View.class.getDeclaredField("mMinHeight"); 89 sMinHeightField.setAccessible(true); 90 } catch (NoSuchFieldException e) { 91 // Couldn't find the field. Abort! 92 } 93 sMinHeightFieldFetched = true; 94 } 95 96 if (sMinHeightField != null) { 97 try { 98 return (int) sMinHeightField.get(view); 99 } catch (Exception e) { 100 // Field get failed. Oh well... 101 } 102 } 103 104 // We failed, return 0 105 return 0; 106 } 107 108 static boolean isAttachedToWindow(View view) { 109 return view.getWindowToken() != null; 110 } 111} 112