KeyButtonView.java revision 5172dc2f36f9c417befd0957ce2ae20f9d083a88 
1/*
2 * Copyright (C) 2008 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.systemui.statusbar.policy;
18
19import android.animation.Animator;
20import android.animation.ObjectAnimator;
21import android.content.Context;
22import android.content.res.TypedArray;
23import android.graphics.drawable.Drawable;
24import android.hardware.input.InputManager;
25import android.os.Bundle;
26import android.os.SystemClock;
27import android.util.AttributeSet;
28import android.util.Log;
29import android.view.HapticFeedbackConstants;
30import android.view.InputDevice;
31import android.view.KeyCharacterMap;
32import android.view.KeyEvent;
33import android.view.MotionEvent;
34import android.view.SoundEffectConstants;
35import android.view.ViewConfiguration;
36import android.view.accessibility.AccessibilityEvent;
37import android.view.accessibility.AccessibilityNodeInfo;
38import android.widget.ImageView;
39
40import com.android.systemui.R;
41
42import static android.view.accessibility.AccessibilityNodeInfo.ACTION_CLICK;
43import static android.view.accessibility.AccessibilityNodeInfo.ACTION_LONG_CLICK;
44
45public class KeyButtonView extends ImageView {
46    private static final String TAG = "StatusBar.KeyButtonView";
47    private static final boolean DEBUG = false;
48
49    // TODO: Get rid of this
50    public static final float DEFAULT_QUIESCENT_ALPHA = 1f;
51
52    private long mDownTime;
53    private int mCode;
54    private int mTouchSlop;
55    private float mDrawingAlpha = 1f;
56    private float mQuiescentAlpha = DEFAULT_QUIESCENT_ALPHA;
57    private boolean mSupportsLongpress = true;
58    private Animator mAnimateToQuiescent = new ObjectAnimator();
59    private Drawable mBackground;
60
61    private final Runnable mCheckLongPress = new Runnable() {
62        public void run() {
63            if (isPressed()) {
64                // Log.d("KeyButtonView", "longpressed: " + this);
65                if (isLongClickable()) {
66                    // Just an old-fashioned ImageView
67                    performLongClick();
68                } else {
69                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
70                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
71                }
72            }
73        }
74    };
75
76    public KeyButtonView(Context context, AttributeSet attrs) {
77        this(context, attrs, 0);
78    }
79
80    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
81        super(context, attrs);
82
83        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
84                defStyle, 0);
85
86        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
87
88        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
89
90        Drawable d = getBackground();
91        if (d != null) {
92            mBackground = d.mutate();
93            setBackground(mBackground);
94        }
95
96        setDrawingAlpha(mQuiescentAlpha);
97
98        a.recycle();
99
100        setClickable(true);
101        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
102    }
103
104    @Override
105    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
106        super.onInitializeAccessibilityNodeInfo(info);
107        if (mCode != 0) {
108            info.addAction(new AccessibilityNodeInfo.AccessibilityAction(ACTION_CLICK, null));
109            if (mSupportsLongpress) {
110                info.addAction(
111                        new AccessibilityNodeInfo.AccessibilityAction(ACTION_LONG_CLICK, null));
112            }
113        }
114    }
115
116    @Override
117    public boolean performAccessibilityAction(int action, Bundle arguments) {
118        if (action == ACTION_CLICK && mCode != 0) {
119            sendEvent(KeyEvent.ACTION_DOWN, 0, SystemClock.uptimeMillis());
120            sendEvent(KeyEvent.ACTION_UP, 0);
121            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
122            playSoundEffect(SoundEffectConstants.CLICK);
123            return true;
124        } else if (action == ACTION_LONG_CLICK && mCode != 0 && mSupportsLongpress) {
125            sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
126            sendEvent(KeyEvent.ACTION_UP, 0);
127            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
128            return true;
129        }
130        return super.performAccessibilityAction(action, arguments);
131    }
132
133    public void setQuiescentAlpha(float alpha, boolean animate) {
134        mAnimateToQuiescent.cancel();
135        alpha = Math.min(Math.max(alpha, 0), 1);
136        if (alpha == mQuiescentAlpha && alpha == mDrawingAlpha) return;
137        mQuiescentAlpha = alpha;
138        if (DEBUG) Log.d(TAG, "New quiescent alpha = " + mQuiescentAlpha);
139        if (mBackground != null && animate) {
140            mAnimateToQuiescent = animateToQuiescent();
141            mAnimateToQuiescent.start();
142        } else {
143            setDrawingAlpha(mQuiescentAlpha);
144        }
145    }
146
147    private ObjectAnimator animateToQuiescent() {
148        return ObjectAnimator.ofFloat(this, "drawingAlpha", mQuiescentAlpha);
149    }
150
151    public float getQuiescentAlpha() {
152        return mQuiescentAlpha;
153    }
154
155    public float getDrawingAlpha() {
156        return mDrawingAlpha;
157    }
158
159    public void setDrawingAlpha(float x) {
160        setImageAlpha((int) (x * 255));
161        if (mBackground != null) {
162            mBackground.setAlpha((int)(x * 255));
163        }
164        mDrawingAlpha = x;
165    }
166
167    public void setPressed(boolean pressed) {
168        if (mBackground != null) {
169            if (pressed != isPressed()) {
170                if (pressed) {
171                    setDrawingAlpha(1f);
172                } else {
173                    mAnimateToQuiescent.cancel();
174                    mAnimateToQuiescent = animateToQuiescent();
175                    mAnimateToQuiescent.setDuration(500);
176                    mAnimateToQuiescent.start();
177                }
178            }
179        }
180        super.setPressed(pressed);
181    }
182
183    private void setHotspot(float x, float y) {
184        if (mBackground != null) {
185            mBackground.setHotspot(x, y);
186        }
187    }
188
189    public boolean onTouchEvent(MotionEvent ev) {
190        final int action = ev.getAction();
191        int x, y;
192
193        switch (action) {
194            case MotionEvent.ACTION_DOWN:
195                //Log.d("KeyButtonView", "press");
196                mDownTime = SystemClock.uptimeMillis();
197                setPressed(true);
198                if (mCode != 0) {
199                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
200                } else {
201                    // Provide the same haptic feedback that the system offers for virtual keys.
202                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
203                }
204                if (mSupportsLongpress) {
205                    removeCallbacks(mCheckLongPress);
206                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
207                }
208                setHotspot(ev.getX(), ev.getY());
209                break;
210            case MotionEvent.ACTION_MOVE:
211                x = (int)ev.getX();
212                y = (int)ev.getY();
213                setPressed(x >= -mTouchSlop
214                        && x < getWidth() + mTouchSlop
215                        && y >= -mTouchSlop
216                        && y < getHeight() + mTouchSlop);
217                setHotspot(ev.getX(), ev.getY());
218                break;
219            case MotionEvent.ACTION_CANCEL:
220                setPressed(false);
221                if (mCode != 0) {
222                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
223                }
224                if (mSupportsLongpress) {
225                    removeCallbacks(mCheckLongPress);
226                }
227                break;
228            case MotionEvent.ACTION_UP:
229                final boolean doIt = isPressed();
230                setPressed(false);
231                if (mCode != 0) {
232                    if (doIt) {
233                        sendEvent(KeyEvent.ACTION_UP, 0);
234                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
235                        playSoundEffect(SoundEffectConstants.CLICK);
236                    } else {
237                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
238                    }
239                } else {
240                    // no key code, just a regular ImageView
241                    if (doIt) {
242                        performClick();
243                    }
244                }
245                if (mSupportsLongpress) {
246                    removeCallbacks(mCheckLongPress);
247                }
248                break;
249        }
250
251        return true;
252    }
253
254    public void sendEvent(int action, int flags) {
255        sendEvent(action, flags, SystemClock.uptimeMillis());
256    }
257
258    void sendEvent(int action, int flags, long when) {
259        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
260        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
261                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
262                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
263                InputDevice.SOURCE_KEYBOARD);
264        InputManager.getInstance().injectInputEvent(ev,
265                InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
266    }
267}
268
269
270