1 /* 2 * Copyright (C) 2010 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.camera.ui; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.view.View; 22 import android.view.ViewGroup; 23 24 // A RotateLayout is designed to display a single item and provides the 25 // capabilities to rotate the item. 26 public class RotateLayout extends ViewGroup implements Rotatable { 27 private static final String TAG = "RotateLayout"; 28 private int mOrientation; 29 private View mChild; 30 RotateLayout(Context context, AttributeSet attrs)31 public RotateLayout(Context context, AttributeSet attrs) { 32 super(context, attrs); 33 // The transparent background here is a workaround of the render issue 34 // happened when the view is rotated as the device's orientation 35 // changed. The view looks fine in landscape. After rotation, the view 36 // is invisible. 37 setBackgroundResource(android.R.color.transparent); 38 } 39 40 @Override onFinishInflate()41 protected void onFinishInflate() { 42 mChild = getChildAt(0); 43 mChild.setPivotX(0); 44 mChild.setPivotY(0); 45 } 46 47 @Override onLayout( boolean change, int left, int top, int right, int bottom)48 protected void onLayout( 49 boolean change, int left, int top, int right, int bottom) { 50 int width = right - left; 51 int height = bottom - top; 52 switch (mOrientation) { 53 case 0: 54 case 180: 55 mChild.layout(0, 0, width, height); 56 break; 57 case 90: 58 case 270: 59 mChild.layout(0, 0, height, width); 60 break; 61 } 62 } 63 64 @Override onMeasure(int widthSpec, int heightSpec)65 protected void onMeasure(int widthSpec, int heightSpec) { 66 int w = 0, h = 0; 67 switch(mOrientation) { 68 case 0: 69 case 180: 70 measureChild(mChild, widthSpec, heightSpec); 71 w = mChild.getMeasuredWidth(); 72 h = mChild.getMeasuredHeight(); 73 break; 74 case 90: 75 case 270: 76 measureChild(mChild, heightSpec, widthSpec); 77 w = mChild.getMeasuredHeight(); 78 h = mChild.getMeasuredWidth(); 79 break; 80 } 81 setMeasuredDimension(w, h); 82 83 switch (mOrientation) { 84 case 0: 85 mChild.setTranslationX(0); 86 mChild.setTranslationY(0); 87 break; 88 case 90: 89 mChild.setTranslationX(0); 90 mChild.setTranslationY(h); 91 break; 92 case 180: 93 mChild.setTranslationX(w); 94 mChild.setTranslationY(h); 95 break; 96 case 270: 97 mChild.setTranslationX(w); 98 mChild.setTranslationY(0); 99 break; 100 } 101 mChild.setRotation(-mOrientation); 102 } 103 104 // Rotate the view counter-clockwise setOrientation(int orientation)105 public void setOrientation(int orientation) { 106 orientation = orientation % 360; 107 if (mOrientation == orientation) return; 108 mOrientation = orientation; 109 requestLayout(); 110 } 111 } 112