KeyButtonView.java revision 7beadfc714565be2d5f383993bb8cfc8e8f9c118 
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    public static final float DEFAULT_QUIESCENT_ALPHA = 0.70f;
50
51    private long mDownTime;
52    private int mCode;
53    private int mTouchSlop;
54    private float mDrawingAlpha = 1f;
55    private float mQuiescentAlpha = DEFAULT_QUIESCENT_ALPHA;
56    private boolean mSupportsLongpress = true;
57    private Animator mAnimateToQuiescent = new ObjectAnimator();
58    private Drawable mBackground;
59
60    private final Runnable mCheckLongPress = new Runnable() {
61        public void run() {
62            if (isPressed()) {
63                // Log.d("KeyButtonView", "longpressed: " + this);
64                if (isLongClickable()) {
65                    // Just an old-fashioned ImageView
66                    performLongClick();
67                } else {
68                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
69                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
70                }
71            }
72        }
73    };
74
75    public KeyButtonView(Context context, AttributeSet attrs) {
76        this(context, attrs, 0);
77    }
78
79    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
80        super(context, attrs);
81
82        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
83                defStyle, 0);
84
85        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
86
87        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
88
89        Drawable d = getBackground();
90        if (d != null) {
91            mBackground = d.mutate();
92            setBackground(mBackground);
93        }
94
95        setDrawingAlpha(mQuiescentAlpha);
96
97        a.recycle();
98
99        setClickable(true);
100        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
101    }
102
103    @Override
104    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
105        super.onInitializeAccessibilityNodeInfo(info);
106        if (mCode != 0) {
107            info.addAction(new AccessibilityNodeInfo.AccessibilityAction(ACTION_CLICK, null));
108            if (mSupportsLongpress) {
109                info.addAction(
110                        new AccessibilityNodeInfo.AccessibilityAction(ACTION_LONG_CLICK, null));
111            }
112        }
113    }
114
115    @Override
116    public boolean performAccessibilityAction(int action, Bundle arguments) {
117        if (action == ACTION_CLICK && mCode != 0) {
118            sendEvent(KeyEvent.ACTION_DOWN, 0, SystemClock.uptimeMillis());
119            sendEvent(KeyEvent.ACTION_UP, 0);
120            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
121            playSoundEffect(SoundEffectConstants.CLICK);
122            return true;
123        } else if (action == ACTION_LONG_CLICK && mCode != 0 && mSupportsLongpress) {
124            sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
125            sendEvent(KeyEvent.ACTION_UP, 0);
126            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
127            return true;
128        }
129        return super.performAccessibilityAction(action, arguments);
130    }
131
132    public void setQuiescentAlpha(float alpha, boolean animate) {
133        mAnimateToQuiescent.cancel();
134        alpha = Math.min(Math.max(alpha, 0), 1);
135        if (alpha == mQuiescentAlpha && alpha == mDrawingAlpha) return;
136        mQuiescentAlpha = alpha;
137        if (DEBUG) Log.d(TAG, "New quiescent alpha = " + mQuiescentAlpha);
138        if (mBackground != null && animate) {
139            mAnimateToQuiescent = animateToQuiescent();
140            mAnimateToQuiescent.start();
141        } else {
142            setDrawingAlpha(mQuiescentAlpha);
143        }
144    }
145
146    private ObjectAnimator animateToQuiescent() {
147        return ObjectAnimator.ofFloat(this, "drawingAlpha", mQuiescentAlpha);
148    }
149
150    public float getQuiescentAlpha() {
151        return mQuiescentAlpha;
152    }
153
154    public float getDrawingAlpha() {
155        return mDrawingAlpha;
156    }
157
158    public void setDrawingAlpha(float x) {
159        setImageAlpha((int) (x * 255));
160        if (mBackground != null) {
161            mBackground.setAlpha((int)(x * 255));
162        }
163        mDrawingAlpha = x;
164    }
165
166    public void setPressed(boolean pressed) {
167        if (mBackground != null) {
168            if (pressed != isPressed()) {
169                if (pressed) {
170                    setDrawingAlpha(1f);
171                } else {
172                    mAnimateToQuiescent.cancel();
173                    mAnimateToQuiescent = animateToQuiescent();
174                    mAnimateToQuiescent.setDuration(500);
175                    mAnimateToQuiescent.start();
176                }
177            }
178        }
179        super.setPressed(pressed);
180    }
181
182    private void setHotspot(float x, float y) {
183        if (mBackground != null) {
184            mBackground.setHotspot(x, y);
185        }
186    }
187
188    public boolean onTouchEvent(MotionEvent ev) {
189        final int action = ev.getAction();
190        int x, y;
191
192        switch (action) {
193            case MotionEvent.ACTION_DOWN:
194                //Log.d("KeyButtonView", "press");
195                mDownTime = SystemClock.uptimeMillis();
196                setPressed(true);
197                if (mCode != 0) {
198                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
199                } else {
200                    // Provide the same haptic feedback that the system offers for virtual keys.
201                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
202                }
203                if (mSupportsLongpress) {
204                    removeCallbacks(mCheckLongPress);
205                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
206                }
207                setHotspot(ev.getX(), ev.getY());
208                break;
209            case MotionEvent.ACTION_MOVE:
210                x = (int)ev.getX();
211                y = (int)ev.getY();
212                setPressed(x >= -mTouchSlop
213                        && x < getWidth() + mTouchSlop
214                        && y >= -mTouchSlop
215                        && y < getHeight() + mTouchSlop);
216                setHotspot(ev.getX(), ev.getY());
217                break;
218            case MotionEvent.ACTION_CANCEL:
219                setPressed(false);
220                if (mCode != 0) {
221                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
222                }
223                if (mSupportsLongpress) {
224                    removeCallbacks(mCheckLongPress);
225                }
226                break;
227            case MotionEvent.ACTION_UP:
228                final boolean doIt = isPressed();
229                setPressed(false);
230                if (mCode != 0) {
231                    if (doIt) {
232                        sendEvent(KeyEvent.ACTION_UP, 0);
233                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
234                        playSoundEffect(SoundEffectConstants.CLICK);
235                    } else {
236                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
237                    }
238                } else {
239                    // no key code, just a regular ImageView
240                    if (doIt) {
241                        performClick();
242                    }
243                }
244                if (mSupportsLongpress) {
245                    removeCallbacks(mCheckLongPress);
246                }
247                break;
248        }
249
250        return true;
251    }
252
253    public void sendEvent(int action, int flags) {
254        sendEvent(action, flags, SystemClock.uptimeMillis());
255    }
256
257    void sendEvent(int action, int flags, long when) {
258        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
259        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
260                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
261                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
262                InputDevice.SOURCE_KEYBOARD);
263        InputManager.getInstance().injectInputEvent(ev,
264                InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
265    }
266}
267
268
269