PreviewGestures.java revision 471c997edfddccfa0762fa720c82cc95777584e8 
1/*
2 * Copyright (C) 2012 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.os.Handler;
20import android.os.Message;
21import android.util.Log;
22import android.view.MotionEvent;
23import android.view.ScaleGestureDetector;
24import android.view.View;
25import android.view.ViewConfiguration;
26
27import com.android.camera.ui.PieRenderer;
28import com.android.camera.ui.RenderOverlay;
29import com.android.camera.ui.ZoomRenderer;
30
31import java.util.ArrayList;
32import java.util.List;
33
34public class PreviewGestures
35        implements ScaleGestureDetector.OnScaleGestureListener {
36
37    private static final String TAG = "CAM_gestures";
38
39    private static final long TIMEOUT_PIE = 200;
40    private static final int MSG_PIE = 1;
41    private static final int MODE_NONE = 0;
42    private static final int MODE_PIE = 1;
43    private static final int MODE_ZOOM = 2;
44    private static final int MODE_MODULE = 3;
45    private static final int MODE_ALL = 4;
46
47    private CameraActivity mActivity;
48    private CameraModule mModule;
49    private RenderOverlay mOverlay;
50    private PieRenderer mPie;
51    private ZoomRenderer mZoom;
52    private MotionEvent mDown;
53    private ScaleGestureDetector mScale;
54    private List<View> mReceivers;
55    private int mMode;
56    private int mSlop;
57    private int mTapTimeout;
58    private boolean mEnabled;
59    private boolean mZoomOnly;
60    private int mOrientation;
61    private Handler mHandler = new Handler() {
62        public void handleMessage(Message msg) {
63            if (msg.what == MSG_PIE) {
64                mMode = MODE_PIE;
65                openPie();
66                cancelActivityTouchHandling(mDown);
67            }
68        }
69    };
70
71    public PreviewGestures(CameraActivity ctx, CameraModule module,
72            ZoomRenderer zoom, PieRenderer pie) {
73        mActivity = ctx;
74        mModule = module;
75        mPie = pie;
76        mZoom = zoom;
77        mMode = MODE_ALL;
78        mScale = new ScaleGestureDetector(ctx, this);
79        mSlop = (int) ctx.getResources().getDimension(R.dimen.pie_touch_slop);
80        mTapTimeout = ViewConfiguration.getTapTimeout();
81        mEnabled = true;
82    }
83
84    public void setRenderOverlay(RenderOverlay overlay) {
85        mOverlay = overlay;
86    }
87
88    public void setOrientation(int orientation) {
89        mOrientation = orientation;
90    }
91
92    public void setEnabled(boolean enabled) {
93        mEnabled = enabled;
94        if (!enabled) {
95            cancelPie();
96        }
97    }
98
99    public void setZoomOnly(boolean zoom) {
100        mZoomOnly = zoom;
101    }
102
103    public void addTouchReceiver(View v) {
104        if (mReceivers == null) {
105            mReceivers = new ArrayList<View>();
106        }
107        mReceivers.add(v);
108    }
109
110    public void clearTouchReceivers() {
111        if (mReceivers != null) {
112            mReceivers.clear();
113        }
114    }
115
116    public boolean dispatchTouch(MotionEvent m) {
117        if (!mEnabled) {
118            return mActivity.superDispatchTouchEvent(m);
119        }
120        if (MotionEvent.ACTION_DOWN == m.getActionMasked()) {
121            if (checkReceivers(m)) {
122                mMode = MODE_MODULE;
123                return mActivity.superDispatchTouchEvent(m);
124            } else {
125                mMode = MODE_ALL;
126                mDown = MotionEvent.obtain(m);
127                if (mPie != null && !mZoomOnly) {
128                    mHandler.sendEmptyMessageDelayed(MSG_PIE, TIMEOUT_PIE);
129                }
130                if (mZoom != null) {
131                    mScale.onTouchEvent(m);
132                }
133                // make sure this is ok
134                return mActivity.superDispatchTouchEvent(m);
135            }
136        } else if (mMode == MODE_NONE) {
137            return false;
138        } else if (mMode == MODE_PIE) {
139            return sendToPie(m);
140        } else if (mMode == MODE_ZOOM) {
141            return mScale.onTouchEvent(m);
142        } else if (mMode == MODE_MODULE) {
143            return mActivity.superDispatchTouchEvent(m);
144        } else {
145            if (MotionEvent.ACTION_POINTER_DOWN == m.getActionMasked()) {
146                if (!mZoomOnly) {
147                    cancelPie();
148                }
149            }
150            // not zoom or pie mode and no timeout yet
151            if (mZoom != null) {
152                boolean res = mScale.onTouchEvent(m);
153                if (mScale.isInProgress()) {
154                    cancelPie();
155                    cancelActivityTouchHandling(m);
156                    return res;
157                }
158            }
159            if (MotionEvent.ACTION_UP == m.getActionMasked()) {
160                cancelPie();
161                cancelActivityTouchHandling(m);
162                // must have been tap
163                if (m.getEventTime() - mDown.getEventTime() < mTapTimeout) {
164                    mModule.onSingleTapUp(null,
165                            (int) mDown.getX() - mOverlay.getWindowPositionX(),
166                            (int) mDown.getY() - mOverlay.getWindowPositionY());
167                    return true;
168                } else {
169                    return mActivity.superDispatchTouchEvent(m);
170                }
171            } else if (MotionEvent.ACTION_MOVE == m.getActionMasked()) {
172                if ((Math.abs(m.getX() - mDown.getX()) > mSlop)
173                        || Math.abs(m.getY() - mDown.getY()) > mSlop) {
174                    // moved too far and no timeout yet, no focus or pie
175                    cancelPie();
176                    if (isSwipe(m)) {
177                        mMode = MODE_MODULE;
178                        return mActivity.superDispatchTouchEvent(m);
179                    } else {
180                        mMode = MODE_NONE;
181                        cancelActivityTouchHandling(m);
182                    }
183                }
184            }
185            return false;
186        }
187    }
188
189    private boolean checkReceivers(MotionEvent m) {
190        if (mReceivers != null) {
191            for (View receiver : mReceivers) {
192                if (isInside(m, receiver)) {
193                    return true;
194                }
195            }
196        }
197        return false;
198    }
199
200    private boolean isSwipe(MotionEvent m) {
201        float dx = 0;
202        switch (mOrientation) {
203        case 0:
204            dx = m.getX() - mDown.getX();
205          return (dx < 0 && Math.abs(m.getY() - mDown.getY()) / -dx < 0.6f);
206        case 90:
207            dx = - (m.getY() - mDown.getY());
208            return (dx < 0 && Math.abs(m.getX() - mDown.getX()) / -dx < 0.6f);
209        case 180:
210            dx = -(m.getX() - mDown.getX());
211            return (dx < 0 && Math.abs(m.getY() - mDown.getY()) / -dx < 0.6f);
212        case 270:
213            dx = m.getY() - mDown.getY();
214            return (dx < 0 && Math.abs(m.getX() - mDown.getX()) / -dx < 0.6f);
215        }
216        return false;
217    }
218
219    private boolean isInside(MotionEvent evt, View v) {
220        return (v.getVisibility() == View.VISIBLE
221                && evt.getX() >= v.getLeft() && evt.getX() < v.getRight()
222                && evt.getY() >= v.getTop() && evt.getY() < v.getBottom());
223    }
224
225    public void cancelActivityTouchHandling(MotionEvent m) {
226        MotionEvent c = MotionEvent.obtain(m);
227        c.setAction(MotionEvent.ACTION_CANCEL);
228        mActivity.superDispatchTouchEvent(c);
229    }
230
231    private void openPie() {
232        mDown.offsetLocation(-mOverlay.getWindowPositionX(),
233                -mOverlay.getWindowPositionY());
234        mOverlay.directDispatchTouch(mDown, mPie);
235    }
236
237    private void cancelPie() {
238        mHandler.removeMessages(MSG_PIE);
239    }
240
241    private boolean sendToPie(MotionEvent m) {
242        m.offsetLocation(-mOverlay.getWindowPositionX(),
243                -mOverlay.getWindowPositionY());
244        return mOverlay.directDispatchTouch(m, mPie);
245    }
246
247    @Override
248    public boolean onScale(ScaleGestureDetector detector) {
249        return mZoom.onScale(detector);
250    }
251
252    @Override
253    public boolean onScaleBegin(ScaleGestureDetector detector) {
254        mMode = MODE_ZOOM;
255        return mZoom.onScaleBegin(detector);
256    }
257
258    @Override
259    public void onScaleEnd(ScaleGestureDetector detector) {
260        mZoom.onScaleEnd(detector);
261    }
262}