1/*
2 * Copyright (C) 2013 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 com.android.camera.ui;
18
19import android.annotation.SuppressLint;
20import android.app.Activity;
21import android.content.Context;
22import android.content.res.Configuration;
23import android.graphics.Rect;
24import android.hardware.display.DisplayManager;
25import android.hardware.display.DisplayManager.DisplayListener;
26import android.util.AttributeSet;
27import android.view.View;
28import android.widget.FrameLayout;
29
30import com.android.camera.util.ApiHelper;
31import com.android.camera.util.CameraUtil;
32
33@SuppressLint("NewApi")
34public class CameraRootView extends FrameLayout {
35
36    private int mTopMargin = 0;
37    private int mBottomMargin = 0;
38    private int mLeftMargin = 0;
39    private int mRightMargin = 0;
40    private Rect mCurrentInsets;
41    private int mOffset = 0;
42    private Object mDisplayListener;
43    private MyDisplayListener mListener;
44
45    public interface MyDisplayListener {
46        public void onDisplayChanged();
47    }
48
49    public CameraRootView(Context context, AttributeSet attrs) {
50        super(context, attrs);
51        initDisplayListener();
52    }
53
54    @Override
55    protected boolean fitSystemWindows(Rect insets) {
56        mCurrentInsets = insets;
57        // insets include status bar, navigation bar, etc
58        // In this case, we are only concerned with the size of nav bar
59        if (mOffset > 0) {
60            return true;
61        }
62
63        if (insets.bottom > 0) {
64            mOffset = insets.bottom;
65        } else if (insets.right > 0) {
66            mOffset = insets.right;
67        }
68        return true;
69    }
70
71    public void initDisplayListener() {
72        if (ApiHelper.HAS_DISPLAY_LISTENER) {
73            mDisplayListener = new DisplayListener() {
74
75                @Override
76                public void onDisplayAdded(int arg0) {}
77
78                @Override
79                public void onDisplayChanged(int arg0) {
80                    if (mListener != null) {
81                        mListener.onDisplayChanged();
82                    }
83                }
84
85                @Override
86                public void onDisplayRemoved(int arg0) {}
87            };
88        }
89    }
90
91    public void removeDisplayChangeListener() {
92        mListener = null;
93    }
94
95    public void setDisplayChangeListener(MyDisplayListener listener) {
96        mListener = listener;
97    }
98
99    @Override
100    public void onAttachedToWindow() {
101        super.onAttachedToWindow();
102        if (ApiHelper.HAS_DISPLAY_LISTENER) {
103            ((DisplayManager) getContext().getSystemService(Context.DISPLAY_SERVICE))
104            .registerDisplayListener((DisplayListener) mDisplayListener, null);
105        }
106    }
107
108    @Override
109    public void onDetachedFromWindow () {
110        super.onDetachedFromWindow();
111        if (ApiHelper.HAS_DISPLAY_LISTENER) {
112            ((DisplayManager) getContext().getSystemService(Context.DISPLAY_SERVICE))
113            .unregisterDisplayListener((DisplayListener) mDisplayListener);
114        }
115    }
116
117    @Override
118    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
119        int rotation = CameraUtil.getDisplayRotation((Activity) getContext());
120        // all the layout code assumes camera device orientation to be portrait
121        // adjust rotation for landscape
122        int orientation = getResources().getConfiguration().orientation;
123        int camOrientation = (rotation % 180 == 0) ? Configuration.ORIENTATION_PORTRAIT
124                : Configuration.ORIENTATION_LANDSCAPE;
125        if (camOrientation != orientation) {
126            rotation = (rotation + 90) % 360;
127        }
128        // calculate margins
129        mLeftMargin = 0;
130        mRightMargin = 0;
131        mBottomMargin = 0;
132        mTopMargin = 0;
133        switch (rotation) {
134            case 0:
135                mBottomMargin += mOffset;
136                break;
137            case 90:
138                mRightMargin += mOffset;
139                break;
140            case 180:
141                mTopMargin += mOffset;
142                break;
143            case 270:
144                mLeftMargin += mOffset;
145                break;
146        }
147        if (mCurrentInsets != null) {
148            if (mCurrentInsets.right > 0) {
149                // navigation bar on the right
150                mRightMargin = mRightMargin > 0 ? mRightMargin : mCurrentInsets.right;
151            } else {
152                // navigation bar on the bottom
153                mBottomMargin = mBottomMargin > 0 ? mBottomMargin : mCurrentInsets.bottom;
154            }
155        }
156        // make sure all the children are resized
157        super.onMeasure(widthMeasureSpec - mLeftMargin - mRightMargin,
158                heightMeasureSpec - mTopMargin - mBottomMargin);
159        setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
160    }
161
162    @Override
163    public void onLayout(boolean changed, int l, int t, int r, int b) {
164        r -= l;
165        b -= t;
166        l = 0;
167        t = 0;
168        int orientation = getResources().getConfiguration().orientation;
169        // Lay out children
170        for (int i = 0; i < getChildCount(); i++) {
171            View v = getChildAt(i);
172            if (v instanceof CameraControls) {
173                // Lay out camera controls to center on the short side of the screen
174                // so that they stay in place during rotation
175                int width = v.getMeasuredWidth();
176                int height = v.getMeasuredHeight();
177                if (orientation == Configuration.ORIENTATION_PORTRAIT) {
178                    int left = (l + r - width) / 2;
179                    v.layout(left, t + mTopMargin, left + width, b - mBottomMargin);
180                } else {
181                    int top = (t + b - height) / 2;
182                    v.layout(l + mLeftMargin, top, r - mRightMargin, top + height);
183                }
184            } else {
185                v.layout(l + mLeftMargin, t + mTopMargin, r - mRightMargin, b - mBottomMargin);
186            }
187        }
188    }
189}
190