1/*
2 * Copyright (C) 2009 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;
18
19import android.content.Context;
20import android.content.res.Configuration;
21import android.util.AttributeSet;
22import android.view.View;
23import android.view.ViewStub;
24import android.widget.RelativeLayout;
25
26import com.android.camera.ui.LayoutChangeHelper;
27import com.android.camera.ui.LayoutChangeNotifier;
28import com.android.gallery3d.common.ApiHelper;
29
30/**
31 * A layout which handles the preview aspect ratio.
32 */
33public class PreviewFrameLayout extends RelativeLayout implements LayoutChangeNotifier {
34
35    private static final String TAG = "CAM_preview";
36
37    /** A callback to be invoked when the preview frame's size changes. */
38    public interface OnSizeChangedListener {
39        public void onSizeChanged(int width, int height);
40    }
41
42    private double mAspectRatio;
43    private View mBorder;
44    private OnSizeChangedListener mListener;
45    private LayoutChangeHelper mLayoutChangeHelper;
46
47    public PreviewFrameLayout(Context context, AttributeSet attrs) {
48        super(context, attrs);
49        setAspectRatio(4.0 / 3.0);
50        mLayoutChangeHelper = new LayoutChangeHelper(this);
51    }
52
53    @Override
54    protected void onFinishInflate() {
55        mBorder = findViewById(R.id.preview_border);
56        if (ApiHelper.HAS_FACE_DETECTION) {
57            ViewStub faceViewStub = (ViewStub) findViewById(R.id.face_view_stub);
58            /* preview_frame_video.xml does not have face view stub, so we need to
59             * check that.
60             */
61            if (faceViewStub != null) {
62                faceViewStub.inflate();
63            }
64        }
65    }
66
67    public void setAspectRatio(double ratio) {
68        if (ratio <= 0.0) throw new IllegalArgumentException();
69
70        if (mAspectRatio != ratio) {
71            mAspectRatio = ratio;
72            requestLayout();
73        }
74    }
75
76    public void showBorder(boolean enabled) {
77        mBorder.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
78    }
79
80    public void fadeOutBorder() {
81        Util.fadeOut(mBorder);
82    }
83
84    @Override
85    protected void onMeasure(int widthSpec, int heightSpec) {
86        int previewWidth = MeasureSpec.getSize(widthSpec);
87        int previewHeight = MeasureSpec.getSize(heightSpec);
88
89        if (!ApiHelper.HAS_SURFACE_TEXTURE) {
90            // Get the padding of the border background.
91            int hPadding = getPaddingLeft() + getPaddingRight();
92            int vPadding = getPaddingTop() + getPaddingBottom();
93
94            // Resize the preview frame with correct aspect ratio.
95            previewWidth -= hPadding;
96            previewHeight -= vPadding;
97
98            boolean widthLonger = previewWidth > previewHeight;
99            int longSide = (widthLonger ? previewWidth : previewHeight);
100            int shortSide = (widthLonger ? previewHeight : previewWidth);
101            if (longSide > shortSide * mAspectRatio) {
102                longSide = (int) ((double) shortSide * mAspectRatio);
103            } else {
104                shortSide = (int) ((double) longSide / mAspectRatio);
105            }
106            if (widthLonger) {
107                previewWidth = longSide;
108                previewHeight = shortSide;
109            } else {
110                previewWidth = shortSide;
111                previewHeight = longSide;
112            }
113
114            // Add the padding of the border.
115            previewWidth += hPadding;
116            previewHeight += vPadding;
117        }
118
119        // Ask children to follow the new preview dimension.
120        super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
121                MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
122    }
123
124    public void setOnSizeChangedListener(OnSizeChangedListener listener) {
125        mListener = listener;
126    }
127
128    @Override
129    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
130        if (mListener != null) mListener.onSizeChanged(w, h);
131    }
132
133    @Override
134    public void setOnLayoutChangeListener(
135            LayoutChangeNotifier.Listener listener) {
136        mLayoutChangeHelper.setOnLayoutChangeListener(listener);
137    }
138
139    @Override
140    protected void onLayout(boolean changed, int l, int t, int r, int b) {
141        super.onLayout(changed, l, t, r, b);
142        mLayoutChangeHelper.onLayout(changed, l, t, r, b);
143    }
144}
145