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.graphics.RectF;
20import android.view.GestureDetector;
21import android.view.TextureView;
22import android.view.View;
23
24/**
25 * This interface defines a listener that watches preview status, including SurfaceTexture
26 * change and preview gestures.
27 */
28public interface PreviewStatusListener extends TextureView.SurfaceTextureListener {
29    /**
30     * The preview status listener needs to provide an
31     * {@link android.view.GestureDetector.OnGestureListener} in order to listen
32     * to the touch events that happen on preview.
33     *
34     * @return a listener that listens to touch events
35     */
36    public GestureDetector.OnGestureListener getGestureListener();
37
38    /**
39     * An {@link android.view.View.OnTouchListener} can be provided in addition to
40     * or instead of a {@link android.view.GestureDetector.OnGestureListener}
41     * for listening to touch events on the preview.  The listener is called whenever
42     * there is a touch event on the {@link com.android.camera.ui.PreviewOverlay}.
43     */
44    public View.OnTouchListener getTouchListener();
45
46    /**
47     * Gets called when preview TextureView gets a layout change call.
48     */
49    public void onPreviewLayoutChanged(View v, int left, int top, int right,
50            int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom);
51
52    /**
53     * This listener gets notified when the actual preview frame changes due
54     * to a transform matrix being applied to the TextureView
55     */
56    public interface PreviewAreaChangedListener {
57        public void onPreviewAreaChanged(RectF previewArea);
58    }
59
60    /**
61     * The preview status listener needs to know for the specific module whether
62     * preview TextureView should automatically adjust its transform matrix based
63     * on the current aspect ratio, width and height of the TextureView.
64     *
65     * @return whether transform matrix should be automatically adjusted
66     */
67    public boolean shouldAutoAdjustTransformMatrixOnLayout();
68
69    /**
70     * Gets called when the preview is flipped (i.e. 180-degree rotated).
71     */
72    public void onPreviewFlipped();
73
74    /**
75     * This listener gets notified when the preview aspect ratio is changed.
76     */
77    public interface PreviewAspectRatioChangedListener {
78        public void onPreviewAspectRatioChanged(float aspectRatio);
79    }
80}
81