KeyButtonView.java revision 0b6586649fe827d6e7ce39fa71e93fa582640a03 
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.AnimatorSet;
20import android.animation.ObjectAnimator;
21import android.content.Context;
22import android.content.res.TypedArray;
23import android.graphics.drawable.Drawable;
24import android.graphics.Canvas;
25import android.graphics.RectF;
26import android.os.RemoteException;
27import android.os.SystemClock;
28import android.os.ServiceManager;
29import android.util.AttributeSet;
30import android.view.accessibility.AccessibilityEvent;
31import android.view.HapticFeedbackConstants;
32import android.view.IWindowManager;
33import android.view.InputDevice;
34import android.view.KeyCharacterMap;
35import android.view.KeyEvent;
36import android.view.MotionEvent;
37import android.view.SoundEffectConstants;
38import android.view.View;
39import android.view.ViewConfiguration;
40import android.widget.ImageView;
41
42import com.android.systemui.R;
43
44public class KeyButtonView extends ImageView {
45    private static final String TAG = "StatusBar.KeyButtonView";
46
47    final float GLOW_MAX_SCALE_FACTOR = 1.8f;
48    final float BUTTON_QUIESCENT_ALPHA = 0.6f;
49
50    IWindowManager mWindowManager;
51    long mDownTime;
52    int mCode;
53    int mTouchSlop;
54    Drawable mGlowBG;
55    float mGlowAlpha = 0f, mGlowScale = 1f, mDrawingAlpha = 1f;
56    boolean mSupportsLongpress = true;
57    RectF mRect = new RectF(0f,0f,0f,0f);
58
59    Runnable mCheckLongPress = new Runnable() {
60        public void run() {
61            if (isPressed()) {
62                // Slog.d("KeyButtonView", "longpressed: " + this);
63                if (mCode != 0) {
64                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
65                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
66                } else {
67                    // Just an old-fashioned ImageView
68                    performLongClick();
69                }
70            }
71        }
72    };
73
74    public KeyButtonView(Context context, AttributeSet attrs) {
75        this(context, attrs, 0);
76    }
77
78    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
79        super(context, attrs);
80
81        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
82                defStyle, 0);
83
84        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
85
86        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
87
88        mGlowBG = a.getDrawable(R.styleable.KeyButtonView_glowBackground);
89        if (mGlowBG != null) {
90            setDrawingAlpha(BUTTON_QUIESCENT_ALPHA);
91        }
92
93        a.recycle();
94
95        mWindowManager = IWindowManager.Stub.asInterface(
96                ServiceManager.getService(Context.WINDOW_SERVICE));
97
98        setClickable(true);
99        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
100    }
101
102    @Override
103    protected void onDraw(Canvas canvas) {
104        if (mGlowBG != null) {
105            canvas.save();
106            final int w = getWidth();
107            final int h = getHeight();
108            canvas.scale(mGlowScale, mGlowScale, w*0.5f, h*0.5f);
109            mGlowBG.setBounds(0, 0, w, h);
110            mGlowBG.setAlpha((int)(mDrawingAlpha * mGlowAlpha * 255));
111            mGlowBG.draw(canvas);
112            canvas.restore();
113            mRect.right = w;
114            mRect.bottom = h;
115        }
116        super.onDraw(canvas);
117    }
118
119    public float getDrawingAlpha() {
120        if (mGlowBG == null) return 0;
121        return mDrawingAlpha;
122    }
123
124    public void setDrawingAlpha(float x) {
125        if (mGlowBG == null) return;
126        // Calling setAlpha(int), which is an ImageView-specific
127        // method that's different from setAlpha(float). This sets
128        // the alpha on this ImageView's drawable directly
129        setAlpha((int) (x * 255));
130        mDrawingAlpha = x;
131    }
132
133    public float getGlowAlpha() {
134        if (mGlowBG == null) return 0;
135        return mGlowAlpha;
136    }
137
138    public void setGlowAlpha(float x) {
139        if (mGlowBG == null) return;
140        mGlowAlpha = x;
141        invalidate();
142    }
143
144    public float getGlowScale() {
145        if (mGlowBG == null) return 0;
146        return mGlowScale;
147    }
148
149    public void setGlowScale(float x) {
150        if (mGlowBG == null) return;
151        mGlowScale = x;
152        final float w = getWidth();
153        final float h = getHeight();
154        if (GLOW_MAX_SCALE_FACTOR <= 1.0f) {
155            // this only works if we know the glow will never leave our bounds
156            invalidate();
157        } else {
158            final float rx = (w * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
159            final float ry = (h * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
160            com.android.systemui.SwipeHelper.invalidateGlobalRegion(
161                    this,
162                    new RectF(getLeft() - rx,
163                              getTop() - ry,
164                              getRight() + rx,
165                              getBottom() + ry));
166
167            // also invalidate our immediate parent to help avoid situations where nearby glows
168            // interfere
169            ((View)getParent()).invalidate();
170        }
171    }
172
173    public void setPressed(boolean pressed) {
174        if (mGlowBG != null) {
175            if (pressed != isPressed()) {
176                AnimatorSet as = new AnimatorSet();
177                if (pressed) {
178                    if (mGlowScale < GLOW_MAX_SCALE_FACTOR)
179                        mGlowScale = GLOW_MAX_SCALE_FACTOR;
180                    if (mGlowAlpha < BUTTON_QUIESCENT_ALPHA)
181                        mGlowAlpha = BUTTON_QUIESCENT_ALPHA;
182                    setDrawingAlpha(1f);
183                    as.playTogether(
184                        ObjectAnimator.ofFloat(this, "glowAlpha", 1f),
185                        ObjectAnimator.ofFloat(this, "glowScale", GLOW_MAX_SCALE_FACTOR)
186                    );
187                    as.setDuration(50);
188                } else {
189                    as.playTogether(
190                        ObjectAnimator.ofFloat(this, "glowAlpha", 0f),
191                        ObjectAnimator.ofFloat(this, "glowScale", 1f),
192                        ObjectAnimator.ofFloat(this, "drawingAlpha", BUTTON_QUIESCENT_ALPHA)
193                    );
194                    as.setDuration(500);
195                }
196                as.start();
197            }
198        }
199        super.setPressed(pressed);
200    }
201
202    public boolean onTouchEvent(MotionEvent ev) {
203        final int action = ev.getAction();
204        int x, y;
205
206        switch (action) {
207            case MotionEvent.ACTION_DOWN:
208                //Slog.d("KeyButtonView", "press");
209                mDownTime = SystemClock.uptimeMillis();
210                setPressed(true);
211                if (mCode != 0) {
212                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
213                } else {
214                    // Provide the same haptic feedback that the system offers for virtual keys.
215                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
216                }
217                if (mSupportsLongpress) {
218                    removeCallbacks(mCheckLongPress);
219                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
220                }
221                break;
222            case MotionEvent.ACTION_MOVE:
223                x = (int)ev.getX();
224                y = (int)ev.getY();
225                setPressed(x >= -mTouchSlop
226                        && x < getWidth() + mTouchSlop
227                        && y >= -mTouchSlop
228                        && y < getHeight() + mTouchSlop);
229                break;
230            case MotionEvent.ACTION_CANCEL:
231                setPressed(false);
232                if (mCode != 0) {
233                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
234                }
235                if (mSupportsLongpress) {
236                    removeCallbacks(mCheckLongPress);
237                }
238                break;
239            case MotionEvent.ACTION_UP:
240                final boolean doIt = isPressed();
241                setPressed(false);
242                if (mCode != 0) {
243                    if (doIt) {
244                        sendEvent(KeyEvent.ACTION_UP, 0);
245                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
246                        playSoundEffect(SoundEffectConstants.CLICK);
247                    } else {
248                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
249                    }
250                } else {
251                    // no key code, just a regular ImageView
252                    if (doIt) {
253                        performClick();
254                    }
255                }
256                if (mSupportsLongpress) {
257                    removeCallbacks(mCheckLongPress);
258                }
259                break;
260        }
261
262        return true;
263    }
264
265    void sendEvent(int action, int flags) {
266        sendEvent(action, flags, SystemClock.uptimeMillis());
267    }
268
269    void sendEvent(int action, int flags, long when) {
270        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
271        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
272                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
273                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
274                InputDevice.SOURCE_KEYBOARD);
275        try {
276            //Slog.d(TAG, "injecting event " + ev);
277            mWindowManager.injectInputEventNoWait(ev);
278        } catch (RemoteException ex) {
279            // System process is dead
280        }
281    }
282}
283
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285