MainActivityLayout.java revision 28a2950939614a0c1c83787960ce1a218fb69a5e 
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.app.Activity;
20import android.content.Context;
21import android.content.Intent;
22import android.provider.MediaStore;
23import android.util.AttributeSet;
24import android.view.MotionEvent;
25import android.view.View;
26import android.view.ViewConfiguration;
27import android.widget.FrameLayout;
28
29import com.android.camera.app.CameraAppUI;
30import com.android.camera.debug.Log;
31import com.android.camera.util.UsageStatistics;
32import com.android.camera.widget.FilmstripLayout;
33import com.android.camera2.R;
34import com.google.common.logging.eventprotos;
35
36public class MainActivityLayout extends FrameLayout {
37
38    private final Log.Tag TAG = new Log.Tag("MainActivityLayout");
39    // Only check for intercepting touch events within first 500ms
40    private static final int SWIPE_TIME_OUT = 500;
41
42    private ModeListView mModeList;
43    private FilmstripLayout mFilmstripLayout;
44    private boolean mCheckToIntercept;
45    private MotionEvent mDown;
46    private final int mSlop;
47    private boolean mRequestToInterceptTouchEvents = false;
48    private View mTouchReceiver = null;
49    private final boolean mIsCaptureIntent;
50    private CameraAppUI.NonDecorWindowSizeChangedListener mNonDecorWindowSizeChangedListener = null;
51
52    // TODO: This can be removed once we come up with a new design for b/13751653.
53    @Deprecated
54    private boolean mSwipeEnabled = true;
55
56    public MainActivityLayout(Context context, AttributeSet attrs) {
57        super(context, attrs);
58        mSlop = ViewConfiguration.get(context).getScaledTouchSlop();
59
60        Activity activity = (Activity) context;
61        Intent intent = activity.getIntent();
62        String action = intent.getAction();
63        mIsCaptureIntent = (MediaStore.ACTION_IMAGE_CAPTURE.equals(action)
64                || MediaStore.ACTION_IMAGE_CAPTURE_SECURE.equals(action)
65                || MediaStore.ACTION_VIDEO_CAPTURE.equals(action));
66    }
67
68    /**
69     * Enables or disables the swipe for modules not supporting the new swipe
70     * logic yet.
71     */
72    @Deprecated
73    public void setSwipeEnabled(boolean enabled) {
74        mSwipeEnabled = enabled;
75    }
76
77    @Override
78    public boolean onInterceptTouchEvent(MotionEvent ev) {
79        if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
80            mCheckToIntercept = true;
81            mDown = MotionEvent.obtain(ev);
82            mTouchReceiver = null;
83            mRequestToInterceptTouchEvents = false;
84            return false;
85        } else if (mRequestToInterceptTouchEvents) {
86            mRequestToInterceptTouchEvents = false;
87            onTouchEvent(mDown);
88            return true;
89        } else if (ev.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
90            // Do not intercept touch once child is in zoom mode
91            mCheckToIntercept = false;
92            return false;
93        } else {
94            // TODO: This can be removed once we come up with a new design for b/13751653.
95            if (!mCheckToIntercept) {
96                return false;
97            }
98            if (ev.getEventTime() - ev.getDownTime() > SWIPE_TIME_OUT) {
99                return false;
100            }
101            if (mIsCaptureIntent || !mSwipeEnabled) {
102                return false;
103            }
104            int deltaX = (int) (ev.getX() - mDown.getX());
105            int deltaY = (int) (ev.getY() - mDown.getY());
106            if (ev.getActionMasked() == MotionEvent.ACTION_MOVE
107                    && Math.abs(deltaX) > mSlop) {
108                // Intercept right swipe
109                if (deltaX >= Math.abs(deltaY) * 2) {
110                    mTouchReceiver = mModeList;
111                    onTouchEvent(mDown);
112                    return true;
113                }
114                // Intercept left swipe
115                else if (deltaX < -Math.abs(deltaY) * 2) {
116                    mTouchReceiver = mFilmstripLayout;
117                    onTouchEvent(mDown);
118                    return true;
119                }
120            }
121        }
122        return false;
123    }
124
125    @Override
126    public boolean onTouchEvent(MotionEvent ev) {
127        if (mTouchReceiver != null) {
128            mTouchReceiver.setVisibility(VISIBLE);
129            return mTouchReceiver.dispatchTouchEvent(ev);
130        }
131        return false;
132    }
133
134    @Override
135    public void onFinishInflate() {
136        mModeList = (ModeListView) findViewById(R.id.mode_list_layout);
137        mFilmstripLayout = (FilmstripLayout) findViewById(R.id.filmstrip_layout);
138    }
139
140    public void redirectTouchEventsTo(View touchReceiver) {
141        if (touchReceiver == null) {
142            Log.e(TAG, "Cannot redirect touch to a null receiver.");
143            return;
144        }
145        mTouchReceiver = touchReceiver;
146        mRequestToInterceptTouchEvents = true;
147    }
148
149    @Override
150    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
151        if (mNonDecorWindowSizeChangedListener != null) {
152            mNonDecorWindowSizeChangedListener.onNonDecorWindowSizeChanged(
153                    MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec));
154        }
155        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
156    }
157
158    /**
159     * Sets a listener that gets notified when the layout size is changed. This
160     * size is the size of main activity layout. It is also the size of the window
161     * excluding the system decor such as status bar and nav bar.
162     */
163    public void setNonDecorWindowSizeChangedListener(
164            CameraAppUI.NonDecorWindowSizeChangedListener listener) {
165        mNonDecorWindowSizeChangedListener = listener;
166        if (mNonDecorWindowSizeChangedListener != null) {
167            mNonDecorWindowSizeChangedListener.onNonDecorWindowSizeChanged(
168                    getMeasuredWidth(), getMeasuredHeight());
169        }
170    }
171}