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.graphics.Matrix;
21 import android.util.AttributeSet;
22 import android.view.View;
23 import android.view.ViewGroup;
24 
25 import com.android.camera.debug.Log;
26 
27 // A RotateLayout is designed to display a single item and provides the
28 // capabilities to rotate the item.
29 public class RotateLayout extends ViewGroup implements Rotatable {
30     @SuppressWarnings("unused")
31     private static final Log.Tag TAG = new Log.Tag("RotateLayout");
32     private int mOrientation;
33     private Matrix mMatrix = new Matrix();
34     protected View mChild;
35 
RotateLayout(Context context, AttributeSet attrs)36     public RotateLayout(Context context, AttributeSet attrs) {
37         super(context, attrs);
38         // The transparent background here is a workaround of the render issue
39         // happened when the view is rotated as the device's orientation
40         // changed. The view looks fine in landscape. After rotation, the view
41         // is invisible.
42         setBackgroundResource(android.R.color.transparent);
43     }
44 
45     @Override
onFinishInflate()46     protected void onFinishInflate() {
47         mChild = getChildAt(0);
48         mChild.setPivotX(0);
49         mChild.setPivotY(0);
50     }
51 
52     @Override
onLayout( boolean change, int left, int top, int right, int bottom)53     protected void onLayout(
54             boolean change, int left, int top, int right, int bottom) {
55         int width = right - left;
56         int height = bottom - top;
57         switch (mOrientation) {
58             case 0:
59             case 180:
60                 mChild.layout(0, 0, width, height);
61                 break;
62             case 90:
63             case 270:
64                 mChild.layout(0, 0, height, width);
65                 break;
66         }
67     }
68 
69     @Override
onMeasure(int widthSpec, int heightSpec)70     protected void onMeasure(int widthSpec, int heightSpec) {
71         int w = 0, h = 0;
72         switch(mOrientation) {
73             case 0:
74             case 180:
75                 measureChild(mChild, widthSpec, heightSpec);
76                 w = mChild.getMeasuredWidth();
77                 h = mChild.getMeasuredHeight();
78                 break;
79             case 90:
80             case 270:
81                 measureChild(mChild, heightSpec, widthSpec);
82                 w = mChild.getMeasuredHeight();
83                 h = mChild.getMeasuredWidth();
84                 break;
85         }
86         setMeasuredDimension(w, h);
87 
88         switch (mOrientation) {
89             case 0:
90                 mChild.setTranslationX(0);
91                 mChild.setTranslationY(0);
92                 break;
93             case 90:
94                 mChild.setTranslationX(0);
95                 mChild.setTranslationY(h);
96                 break;
97             case 180:
98                 mChild.setTranslationX(w);
99                 mChild.setTranslationY(h);
100                 break;
101             case 270:
102                 mChild.setTranslationX(w);
103                 mChild.setTranslationY(0);
104                 break;
105         }
106         mChild.setRotation(-mOrientation);
107     }
108 
109     @Override
shouldDelayChildPressedState()110     public boolean shouldDelayChildPressedState() {
111         return false;
112     }
113 
114     // Rotate the view counter-clockwise
115     @Override
setOrientation(int orientation, boolean animation)116     public void setOrientation(int orientation, boolean animation) {
117         orientation = orientation % 360;
118         if (mOrientation == orientation) return;
119         mOrientation = orientation;
120         requestLayout();
121     }
122 
getOrientation()123     public int getOrientation() {
124         return mOrientation;
125     }
126 }
127