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