KeyButtonView.java revision c638c1eb1bbed67d7d8f0d43f39137d766366f54 
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.content.Context;
23import android.content.res.TypedArray;
24import android.graphics.drawable.AnimationDrawable;
25import android.graphics.drawable.Drawable;
26import android.graphics.Canvas;
27import android.graphics.RectF;
28import android.os.RemoteException;
29import android.os.SystemClock;
30import android.os.ServiceManager;
31import android.util.AttributeSet;
32import android.util.Slog;
33import android.view.accessibility.AccessibilityEvent;
34import android.view.HapticFeedbackConstants;
35import android.view.IWindowManager;
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.ViewGroup;
44import android.widget.ImageView;
45import android.widget.RemoteViews.RemoteView;
46
47import com.android.systemui.R;
48
49public class KeyButtonView extends ImageView {
50    private static final String TAG = "StatusBar.KeyButtonView";
51
52    final float GLOW_MAX_SCALE_FACTOR = 1.8f;
53
54    IWindowManager mWindowManager;
55    long mDownTime;
56    boolean mSending;
57    int mCode;
58    int mRepeat;
59    int mTouchSlop;
60    Drawable mGlowBG;
61    float mGlowAlpha = 0f, mGlowScale = 1f, mDrawingAlpha = 1f;
62    boolean mSupportsLongpress = true;
63    RectF mRect = new RectF(0f,0f,0f,0f);
64
65    Runnable mCheckLongPress = new Runnable() {
66        public void run() {
67            if (isPressed()) {
68                // Slog.d("KeyButtonView", "longpressed: " + this);
69                if (mCode != 0) {
70                    mRepeat++;
71                    sendEvent(KeyEvent.ACTION_DOWN,
72                            KeyEvent.FLAG_FROM_SYSTEM
73                            | KeyEvent.FLAG_VIRTUAL_HARD_KEY
74                            | KeyEvent.FLAG_LONG_PRESS);
75
76                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
77                } else {
78                    // Just an old-fashioned ImageView
79                    performLongClick();
80                }
81            }
82        }
83    };
84
85    public KeyButtonView(Context context, AttributeSet attrs) {
86        this(context, attrs, 0);
87    }
88
89    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
90        super(context, attrs);
91
92        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
93                defStyle, 0);
94
95        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
96
97        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
98
99        mGlowBG = a.getDrawable(R.styleable.KeyButtonView_glowBackground);
100        if (mGlowBG != null) {
101            mDrawingAlpha = 0.5f;
102        }
103
104        a.recycle();
105
106        mWindowManager = IWindowManager.Stub.asInterface(
107                ServiceManager.getService(Context.WINDOW_SERVICE));
108
109        setClickable(true);
110        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
111    }
112
113    @Override
114    protected void onDraw(Canvas canvas) {
115        if (mGlowBG != null) {
116            canvas.save();
117            final int w = getWidth();
118            final int h = getHeight();
119            canvas.scale(mGlowScale, mGlowScale, w*0.5f, h*0.5f);
120            mGlowBG.setBounds(0, 0, w, h);
121            mGlowBG.setAlpha((int)(mGlowAlpha * 255));
122            mGlowBG.draw(canvas);
123            canvas.restore();
124            mRect.right = w;
125            mRect.bottom = h;
126            canvas.saveLayerAlpha(mRect, (int)(mDrawingAlpha * 255), Canvas.ALL_SAVE_FLAG);
127        }
128        super.onDraw(canvas);
129        if (mGlowBG != null) {
130            canvas.restore();
131        }
132    }
133
134    public float getDrawingAlpha() {
135        if (mGlowBG == null) return 0;
136        return mDrawingAlpha;
137    }
138
139    public void setDrawingAlpha(float x) {
140        if (mGlowBG == null) return;
141        mDrawingAlpha = x;
142        invalidate();
143    }
144
145    public float getGlowAlpha() {
146        if (mGlowBG == null) return 0;
147        return mGlowAlpha;
148    }
149
150    public void setGlowAlpha(float x) {
151        if (mGlowBG == null) return;
152        mGlowAlpha = x;
153        invalidate();
154    }
155
156    public float getGlowScale() {
157        if (mGlowBG == null) return 0;
158        return mGlowScale;
159    }
160
161    public void setGlowScale(float x) {
162        if (mGlowBG == null) return;
163        mGlowScale = x;
164        final float w = getWidth();
165        final float h = getHeight();
166        if (GLOW_MAX_SCALE_FACTOR <= 1.0f) {
167            // this only works if we know the glow will never leave our bounds
168            invalidate();
169        } else {
170            final float rx = (w * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
171            final float ry = (h * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
172            com.android.systemui.SwipeHelper.invalidateGlobalRegion(
173                    this,
174                    new RectF(getLeft() - rx,
175                              getTop() - ry,
176                              getRight() + rx,
177                              getBottom() + ry));
178
179            // also invalidate our immediate parent to help avoid situations where nearby glows
180            // interfere
181            ((View)getParent()).invalidate();
182        }
183    }
184
185    public void setPressed(boolean pressed) {
186        if (mGlowBG != null) {
187            if (pressed != isPressed()) {
188                AnimatorSet as = new AnimatorSet();
189                if (pressed) {
190                    if (mGlowScale < 1.7f) mGlowScale = 1.7f;
191                    if (mGlowAlpha < 0.5f) mGlowAlpha = 0.5f;
192                    setDrawingAlpha(1f);
193                    as.playTogether(
194                        ObjectAnimator.ofFloat(this, "glowAlpha", 1f),
195                        ObjectAnimator.ofFloat(this, "glowScale", GLOW_MAX_SCALE_FACTOR)
196                    );
197                    as.setDuration(50);
198                } else {
199                    as.playTogether(
200                        ObjectAnimator.ofFloat(this, "glowAlpha", 0f),
201                        ObjectAnimator.ofFloat(this, "glowScale", 1f),
202                        ObjectAnimator.ofFloat(this, "drawingAlpha", 0.5f)
203                    );
204                    as.setDuration(500);
205                }
206                as.start();
207            }
208        }
209        super.setPressed(pressed);
210    }
211
212    public boolean onTouchEvent(MotionEvent ev) {
213        final int action = ev.getAction();
214        int x, y;
215
216        switch (action) {
217            case MotionEvent.ACTION_DOWN:
218                //Slog.d("KeyButtonView", "press");
219                mDownTime = SystemClock.uptimeMillis();
220                mRepeat = 0;
221                mSending = true;
222                setPressed(true);
223                sendEvent(KeyEvent.ACTION_DOWN,
224                        KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY, mDownTime);
225                if (mSupportsLongpress) {
226                    removeCallbacks(mCheckLongPress);
227                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
228                } else {
229                    mSending = false;
230                    sendEvent(KeyEvent.ACTION_UP,
231                            KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY, mDownTime);
232                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
233                    playSoundEffect(SoundEffectConstants.CLICK);
234                }
235                break;
236            case MotionEvent.ACTION_MOVE:
237                if (mSending) {
238                    x = (int)ev.getX();
239                    y = (int)ev.getY();
240                    setPressed(x >= -mTouchSlop
241                            && x < getWidth() + mTouchSlop
242                            && y >= -mTouchSlop
243                            && y < getHeight() + mTouchSlop);
244                }
245                break;
246            case MotionEvent.ACTION_CANCEL:
247                setPressed(false);
248                if (mSending) {
249                    mSending = false;
250                    sendEvent(KeyEvent.ACTION_UP,
251                            KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY
252                                | KeyEvent.FLAG_CANCELED);
253                    if (mSupportsLongpress) {
254                        removeCallbacks(mCheckLongPress);
255                    }
256                }
257                break;
258            case MotionEvent.ACTION_UP:
259                final boolean doIt = isPressed();
260                setPressed(false);
261                if (mSending) {
262                    mSending = false;
263                    final int flags = KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY;
264                    if (mSupportsLongpress) {
265                        removeCallbacks(mCheckLongPress);
266                    }
267
268                    if (mCode != 0) {
269                        if (doIt) {
270                            sendEvent(KeyEvent.ACTION_UP, flags);
271                            sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
272                            playSoundEffect(SoundEffectConstants.CLICK);
273                        }
274                    } else {
275                        // no key code, just a regular ImageView
276                        if (doIt) performClick();
277                    }
278                }
279                break;
280        }
281
282        return true;
283    }
284
285    void sendEvent(int action, int flags) {
286        sendEvent(action, flags, SystemClock.uptimeMillis());
287    }
288
289    void sendEvent(int action, int flags, long when) {
290        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, mRepeat,
291                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, flags, InputDevice.SOURCE_KEYBOARD);
292        try {
293            //Slog.d(TAG, "injecting event " + ev);
294            mWindowManager.injectInputEventNoWait(ev);
295        } catch (RemoteException ex) {
296            // System process is dead
297        }
298    }
299}
300
301
302