KeyButtonView.java revision 42310965fa2c0d2c91bea0a76730a21f6dd308a2 
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.AnimatorSet;
21import android.animation.ObjectAnimator;
22import android.animation.TimeInterpolator;
23import android.app.ActivityManager;
24import android.content.Context;
25import android.content.res.TypedArray;
26import android.graphics.Canvas;
27import android.graphics.Paint;
28import android.graphics.RectF;
29import android.hardware.input.InputManager;
30import android.media.AudioManager;
31import android.os.Bundle;
32import android.os.SystemClock;
33import android.util.AttributeSet;
34import android.util.Log;
35import android.view.HapticFeedbackConstants;
36import android.view.InputDevice;
37import android.view.KeyCharacterMap;
38import android.view.KeyEvent;
39import android.view.MotionEvent;
40import android.view.SoundEffectConstants;
41import android.view.View;
42import android.view.ViewConfiguration;
43import android.view.accessibility.AccessibilityEvent;
44import android.view.accessibility.AccessibilityNodeInfo;
45import android.widget.ImageView;
46import java.lang.Math;
47
48import com.android.systemui.R;
49
50import static android.view.accessibility.AccessibilityNodeInfo.ACTION_CLICK;
51import static android.view.accessibility.AccessibilityNodeInfo.ACTION_LONG_CLICK;
52
53public class KeyButtonView extends ImageView {
54    private static final String TAG = "StatusBar.KeyButtonView";
55    private static final boolean DEBUG = false;
56
57    // TODO: Get rid of this
58    public static final float DEFAULT_QUIESCENT_ALPHA = 1f;
59    public static final float MAX_ALPHA = 0.15f;
60    public static final float GLOW_MAX_SCALE_FACTOR = 1.5f;
61
62    private long mDownTime;
63    private int mCode;
64    private int mTouchSlop;
65    private float mGlowAlpha = 0f;
66    private float mGlowScale = 1f;
67    private float mDrawingAlpha = 1f;
68    private float mQuiescentAlpha = DEFAULT_QUIESCENT_ALPHA;
69    private boolean mSupportsLongpress = true;
70    private AnimatorSet mPressedAnim;
71    private Animator mAnimateToQuiescent = new ObjectAnimator();
72    private Paint mRipplePaint;
73    private final TimeInterpolator mInterpolator = (TimeInterpolator) new LogInterpolator();
74    private AudioManager mAudioManager;
75
76    private final Runnable mCheckLongPress = new Runnable() {
77        public void run() {
78            if (isPressed()) {
79                // Log.d("KeyButtonView", "longpressed: " + this);
80                if (isLongClickable()) {
81                    // Just an old-fashioned ImageView
82                    performLongClick();
83                } else {
84                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
85                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
86                }
87            }
88        }
89    };
90
91    public KeyButtonView(Context context, AttributeSet attrs) {
92        this(context, attrs, 0);
93    }
94
95    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
96        super(context, attrs);
97
98        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
99                defStyle, 0);
100
101        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
102
103        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
104
105
106        setDrawingAlpha(mQuiescentAlpha);
107
108        a.recycle();
109
110        setClickable(true);
111        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
112        mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
113    }
114
115    @Override
116    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
117        super.onInitializeAccessibilityNodeInfo(info);
118        if (mCode != 0) {
119            info.addAction(new AccessibilityNodeInfo.AccessibilityAction(ACTION_CLICK, null));
120            if (mSupportsLongpress) {
121                info.addAction(
122                        new AccessibilityNodeInfo.AccessibilityAction(ACTION_LONG_CLICK, null));
123            }
124        }
125    }
126
127    @Override
128    public boolean performAccessibilityAction(int action, Bundle arguments) {
129        if (action == ACTION_CLICK && mCode != 0) {
130            sendEvent(KeyEvent.ACTION_DOWN, 0, SystemClock.uptimeMillis());
131            sendEvent(KeyEvent.ACTION_UP, 0);
132            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
133            playSoundEffect(SoundEffectConstants.CLICK);
134            return true;
135        } else if (action == ACTION_LONG_CLICK && mCode != 0 && mSupportsLongpress) {
136            sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
137            sendEvent(KeyEvent.ACTION_UP, 0);
138            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
139            return true;
140        }
141        return super.performAccessibilityAction(action, arguments);
142    }
143
144    private Paint getRipplePaint() {
145        if (mRipplePaint == null) {
146            mRipplePaint = new Paint();
147            mRipplePaint.setAntiAlias(true);
148            mRipplePaint.setColor(0xffffffff);
149        }
150        return mRipplePaint;
151    }
152
153    @Override
154    protected void onDraw(Canvas canvas) {
155        final Paint p = getRipplePaint();
156        p.setAlpha((int)(MAX_ALPHA * mDrawingAlpha * mGlowAlpha * 255));
157
158        final float w = getWidth();
159        final float h = getHeight();
160        final boolean horizontal = w > h;
161        final float diameter = (horizontal ? w : h) * mGlowScale;
162        final float radius = diameter * .5f;
163        final float cx = w * .5f;
164        final float cy = h * .5f;
165        final float rx = horizontal ? radius : cx;
166        final float ry = horizontal ? cy : radius;
167        final float corner = horizontal ? cy : cx;
168
169        canvas.drawRoundRect(cx - rx, cy - ry,
170                             cx + rx, cy + ry,
171                             corner, corner, p);
172
173        super.onDraw(canvas);
174    }
175
176    public void setQuiescentAlpha(float alpha, boolean animate) {
177        mAnimateToQuiescent.cancel();
178        alpha = Math.min(Math.max(alpha, 0), 1);
179        if (alpha == mQuiescentAlpha && alpha == mDrawingAlpha) return;
180        mQuiescentAlpha = alpha;
181        if (DEBUG) Log.d(TAG, "New quiescent alpha = " + mQuiescentAlpha);
182        if (animate) {
183            mAnimateToQuiescent = animateToQuiescent();
184            mAnimateToQuiescent.start();
185        } else {
186            setDrawingAlpha(mQuiescentAlpha);
187        }
188    }
189
190    private ObjectAnimator animateToQuiescent() {
191        return ObjectAnimator.ofFloat(this, "drawingAlpha", mQuiescentAlpha);
192    }
193
194    public float getQuiescentAlpha() {
195        return mQuiescentAlpha;
196    }
197
198    public float getDrawingAlpha() {
199        return mDrawingAlpha;
200    }
201
202    public void setDrawingAlpha(float x) {
203        setImageAlpha((int) (x * 255));
204        mDrawingAlpha = x;
205    }
206
207    public float getGlowAlpha() {
208        return mGlowAlpha;
209    }
210
211    public void setGlowAlpha(float x) {
212        mGlowAlpha = x;
213        invalidate();
214    }
215
216    public float getGlowScale() {
217        return mGlowScale;
218    }
219
220    public void setGlowScale(float x) {
221        mGlowScale = x;
222        final float w = getWidth();
223        final float h = getHeight();
224        if (GLOW_MAX_SCALE_FACTOR <= 1.0f) {
225            // this only works if we know the glow will never leave our bounds
226            invalidate();
227        } else {
228            final float rx = (w * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
229            final float ry = (h * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
230            com.android.systemui.SwipeHelper.invalidateGlobalRegion(
231                    this,
232                    new RectF(getLeft() - rx,
233                              getTop() - ry,
234                              getRight() + rx,
235                              getBottom() + ry));
236
237            // also invalidate our immediate parent to help avoid situations where nearby glows
238            // interfere
239            ((View)getParent()).invalidate();
240        }
241    }
242
243    public void setPressed(boolean pressed) {
244        if (pressed != isPressed()) {
245            if (mPressedAnim != null && mPressedAnim.isRunning()) {
246                mPressedAnim.cancel();
247            }
248            final AnimatorSet as = mPressedAnim = new AnimatorSet();
249            final ObjectAnimator scaleAnimator = ObjectAnimator.ofFloat(this,
250                    "glowScale", GLOW_MAX_SCALE_FACTOR);
251            scaleAnimator.setInterpolator(mInterpolator);
252            if (pressed) {
253                mGlowScale = 0f;
254                if (mGlowAlpha < mQuiescentAlpha)
255                    mGlowAlpha = mQuiescentAlpha;
256                setDrawingAlpha(1f);
257                as.playTogether(
258                    ObjectAnimator.ofFloat(this, "glowAlpha", 1f),
259                    scaleAnimator
260                );
261                as.setDuration(500);
262            } else {
263                mAnimateToQuiescent.cancel();
264                mAnimateToQuiescent = animateToQuiescent();
265                as.playTogether(
266                    ObjectAnimator.ofFloat(this, "glowAlpha", mGlowAlpha, mGlowAlpha * .2f, 0f),
267                    scaleAnimator,
268                    mAnimateToQuiescent
269                );
270                as.setDuration(500);
271            }
272            as.start();
273        }
274        super.setPressed(pressed);
275    }
276
277    public boolean onTouchEvent(MotionEvent ev) {
278        final int action = ev.getAction();
279        int x, y;
280
281        switch (action) {
282            case MotionEvent.ACTION_DOWN:
283                //Log.d("KeyButtonView", "press");
284                mDownTime = SystemClock.uptimeMillis();
285                setPressed(true);
286                if (mCode != 0) {
287                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
288                } else {
289                    // Provide the same haptic feedback that the system offers for virtual keys.
290                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
291                }
292                if (mSupportsLongpress) {
293                    removeCallbacks(mCheckLongPress);
294                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
295                }
296                break;
297            case MotionEvent.ACTION_MOVE:
298                x = (int)ev.getX();
299                y = (int)ev.getY();
300                setPressed(x >= -mTouchSlop
301                        && x < getWidth() + mTouchSlop
302                        && y >= -mTouchSlop
303                        && y < getHeight() + mTouchSlop);
304                break;
305            case MotionEvent.ACTION_CANCEL:
306                setPressed(false);
307                if (mCode != 0) {
308                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
309                }
310                if (mSupportsLongpress) {
311                    removeCallbacks(mCheckLongPress);
312                }
313                break;
314            case MotionEvent.ACTION_UP:
315                final boolean doIt = isPressed();
316                setPressed(false);
317                if (mCode != 0) {
318                    if (doIt) {
319                        sendEvent(KeyEvent.ACTION_UP, 0);
320                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
321                        playSoundEffect(SoundEffectConstants.CLICK);
322                    } else {
323                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
324                    }
325                } else {
326                    // no key code, just a regular ImageView
327                    if (doIt) {
328                        performClick();
329                    }
330                }
331                if (mSupportsLongpress) {
332                    removeCallbacks(mCheckLongPress);
333                }
334                break;
335        }
336
337        return true;
338    }
339
340    public void playSoundEffect(int soundConstant) {
341        mAudioManager.playSoundEffect(soundConstant, ActivityManager.getCurrentUser());
342    };
343
344    public void sendEvent(int action, int flags) {
345        sendEvent(action, flags, SystemClock.uptimeMillis());
346    }
347
348    void sendEvent(int action, int flags, long when) {
349        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
350        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
351                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
352                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
353                InputDevice.SOURCE_KEYBOARD);
354        InputManager.getInstance().injectInputEvent(ev,
355                InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
356    }
357
358    /**
359    * Interpolator with a smooth log deceleration
360    */
361    private static final class LogInterpolator implements TimeInterpolator {
362        @Override
363        public float getInterpolation(float input) {
364            return 1 - (float) Math.pow(400, -input * 1.4);
365        }
366    }
367
368}
369
370
371