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 final Rect mCurrentInsets = new Rect(0, 0, 0, 0);
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        // insets include status bar, navigation bar, etc
57        // In this case, we are only concerned with the size of nav bar
58        if (mCurrentInsets.equals(insets)) {
59            // Local copy of the insets is up to date. No need to do anything.
60            return false;
61        }
62
63        if (mOffset == 0) {
64            if (insets.bottom > 0) {
65                mOffset = insets.bottom;
66            } else if (insets.right > 0) {
67                mOffset = insets.right;
68            }
69        }
70        mCurrentInsets.set(insets);
71        // Make sure onMeasure will be called to adapt to the new insets.
72        requestLayout();
73        return false;
74    }
75
76    public void initDisplayListener() {
77        if (ApiHelper.HAS_DISPLAY_LISTENER) {
78            mDisplayListener = new DisplayListener() {
79
80                @Override
81                public void onDisplayAdded(int arg0) {}
82
83                @Override
84                public void onDisplayChanged(int arg0) {
85                    if (mListener != null) {
86                        mListener.onDisplayChanged();
87                    }
88                }
89
90                @Override
91                public void onDisplayRemoved(int arg0) {}
92            };
93        }
94    }
95
96    public void removeDisplayChangeListener() {
97        mListener = null;
98    }
99
100    public void setDisplayChangeListener(MyDisplayListener listener) {
101        mListener = listener;
102    }
103
104    @Override
105    public void onAttachedToWindow() {
106        super.onAttachedToWindow();
107        if (ApiHelper.HAS_DISPLAY_LISTENER) {
108            ((DisplayManager) getContext().getSystemService(Context.DISPLAY_SERVICE))
109            .registerDisplayListener((DisplayListener) mDisplayListener, null);
110        }
111    }
112
113    @Override
114    public void onDetachedFromWindow () {
115        super.onDetachedFromWindow();
116        if (ApiHelper.HAS_DISPLAY_LISTENER) {
117            ((DisplayManager) getContext().getSystemService(Context.DISPLAY_SERVICE))
118            .unregisterDisplayListener((DisplayListener) mDisplayListener);
119        }
120    }
121
122    @Override
123    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
124        int rotation = CameraUtil.getDisplayRotation((Activity) getContext());
125        // all the layout code assumes camera device orientation to be portrait
126        // adjust rotation for landscape
127        int orientation = getResources().getConfiguration().orientation;
128        int camOrientation = (rotation % 180 == 0) ? Configuration.ORIENTATION_PORTRAIT
129                : Configuration.ORIENTATION_LANDSCAPE;
130        if (camOrientation != orientation) {
131            rotation = (rotation + 90) % 360;
132        }
133        // calculate margins
134        mLeftMargin = 0;
135        mRightMargin = 0;
136        mBottomMargin = 0;
137        mTopMargin = 0;
138        switch (rotation) {
139            case 0:
140                mBottomMargin += mOffset;
141                break;
142            case 90:
143                mRightMargin += mOffset;
144                break;
145            case 180:
146                mTopMargin += mOffset;
147                break;
148            case 270:
149                mLeftMargin += mOffset;
150                break;
151        }
152        if (mCurrentInsets != null) {
153            if (mCurrentInsets.right > 0) {
154                // navigation bar on the right
155                mRightMargin = mRightMargin > 0 ? mRightMargin : mCurrentInsets.right;
156            } else {
157                // navigation bar on the bottom
158                mBottomMargin = mBottomMargin > 0 ? mBottomMargin : mCurrentInsets.bottom;
159            }
160        }
161        // make sure all the children are resized
162        super.onMeasure(widthMeasureSpec - mLeftMargin - mRightMargin,
163                heightMeasureSpec - mTopMargin - mBottomMargin);
164        setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
165    }
166
167    @Override
168    public void onLayout(boolean changed, int l, int t, int r, int b) {
169        r -= l;
170        b -= t;
171        l = 0;
172        t = 0;
173        int orientation = getResources().getConfiguration().orientation;
174        // Lay out children
175        for (int i = 0; i < getChildCount(); i++) {
176            View v = getChildAt(i);
177            if (v instanceof CameraControls) {
178                // Lay out camera controls to center on the short side of the screen
179                // so that they stay in place during rotation
180                int width = v.getMeasuredWidth();
181                int height = v.getMeasuredHeight();
182                if (orientation == Configuration.ORIENTATION_PORTRAIT) {
183                    int left = (l + r - width) / 2;
184                    v.layout(left, t + mTopMargin, left + width, b - mBottomMargin);
185                } else {
186                    int top = (t + b - height) / 2;
187                    v.layout(l + mLeftMargin, top, r - mRightMargin, top + height);
188                }
189            } else {
190                v.layout(l + mLeftMargin, t + mTopMargin, r - mRightMargin, b - mBottomMargin);
191            }
192        }
193    }
194}
195