KeyButtonView.java revision 98392efb24d8aac36a4cfa85106812e17d5984f9 
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
49    IWindowManager mWindowManager;
50    long mDownTime;
51    int mCode;
52    int mTouchSlop;
53    Drawable mGlowBG;
54    float mGlowAlpha = 0f, mGlowScale = 1f, mDrawingAlpha = 1f;
55    boolean mSupportsLongpress = true;
56    RectF mRect = new RectF(0f,0f,0f,0f);
57
58    Runnable mCheckLongPress = new Runnable() {
59        public void run() {
60            if (isPressed()) {
61                // Slog.d("KeyButtonView", "longpressed: " + this);
62                if (mCode != 0) {
63                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
64                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
65                } else {
66                    // Just an old-fashioned ImageView
67                    performLongClick();
68                }
69            }
70        }
71    };
72
73    public KeyButtonView(Context context, AttributeSet attrs) {
74        this(context, attrs, 0);
75    }
76
77    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
78        super(context, attrs);
79
80        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
81                defStyle, 0);
82
83        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
84
85        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
86
87        mGlowBG = a.getDrawable(R.styleable.KeyButtonView_glowBackground);
88        if (mGlowBG != null) {
89            mDrawingAlpha = 0.5f;
90        }
91
92        a.recycle();
93
94        mWindowManager = IWindowManager.Stub.asInterface(
95                ServiceManager.getService(Context.WINDOW_SERVICE));
96
97        setClickable(true);
98        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
99    }
100
101    @Override
102    protected void onDraw(Canvas canvas) {
103        if (mGlowBG != null) {
104            canvas.save();
105            final int w = getWidth();
106            final int h = getHeight();
107            canvas.scale(mGlowScale, mGlowScale, w*0.5f, h*0.5f);
108            mGlowBG.setBounds(0, 0, w, h);
109            mGlowBG.setAlpha((int)(mGlowAlpha * 255));
110            mGlowBG.draw(canvas);
111            canvas.restore();
112            mRect.right = w;
113            mRect.bottom = h;
114            canvas.saveLayerAlpha(mRect, (int)(mDrawingAlpha * 255), Canvas.ALL_SAVE_FLAG);
115        }
116        super.onDraw(canvas);
117        if (mGlowBG != null) {
118            canvas.restore();
119        }
120    }
121
122    public float getDrawingAlpha() {
123        if (mGlowBG == null) return 0;
124        return mDrawingAlpha;
125    }
126
127    public void setDrawingAlpha(float x) {
128        if (mGlowBG == null) return;
129        mDrawingAlpha = x;
130        invalidate();
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 < 1.7f) mGlowScale = 1.7f;
179                    if (mGlowAlpha < 0.5f) mGlowAlpha = 0.5f;
180                    setDrawingAlpha(1f);
181                    as.playTogether(
182                        ObjectAnimator.ofFloat(this, "glowAlpha", 1f),
183                        ObjectAnimator.ofFloat(this, "glowScale", GLOW_MAX_SCALE_FACTOR)
184                    );
185                    as.setDuration(50);
186                } else {
187                    as.playTogether(
188                        ObjectAnimator.ofFloat(this, "glowAlpha", 0f),
189                        ObjectAnimator.ofFloat(this, "glowScale", 1f),
190                        ObjectAnimator.ofFloat(this, "drawingAlpha", 0.5f)
191                    );
192                    as.setDuration(500);
193                }
194                as.start();
195            }
196        }
197        super.setPressed(pressed);
198    }
199
200    public boolean onTouchEvent(MotionEvent ev) {
201        final int action = ev.getAction();
202        int x, y;
203
204        switch (action) {
205            case MotionEvent.ACTION_DOWN:
206                //Slog.d("KeyButtonView", "press");
207                mDownTime = SystemClock.uptimeMillis();
208                setPressed(true);
209                if (mCode != 0) {
210                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
211                } else {
212                    // Provide the same haptic feedback that the system offers for virtual keys.
213                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
214                }
215                if (mSupportsLongpress) {
216                    removeCallbacks(mCheckLongPress);
217                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
218                }
219                break;
220            case MotionEvent.ACTION_MOVE:
221                x = (int)ev.getX();
222                y = (int)ev.getY();
223                setPressed(x >= -mTouchSlop
224                        && x < getWidth() + mTouchSlop
225                        && y >= -mTouchSlop
226                        && y < getHeight() + mTouchSlop);
227                break;
228            case MotionEvent.ACTION_CANCEL:
229                setPressed(false);
230                if (mCode != 0) {
231                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
232                }
233                if (mSupportsLongpress) {
234                    removeCallbacks(mCheckLongPress);
235                }
236                break;
237            case MotionEvent.ACTION_UP:
238                final boolean doIt = isPressed();
239                setPressed(false);
240                if (mCode != 0) {
241                    if (doIt) {
242                        sendEvent(KeyEvent.ACTION_UP, 0);
243                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
244                        playSoundEffect(SoundEffectConstants.CLICK);
245                    } else {
246                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
247                    }
248                } else {
249                    // no key code, just a regular ImageView
250                    if (doIt) {
251                        performClick();
252                    }
253                }
254                if (mSupportsLongpress) {
255                    removeCallbacks(mCheckLongPress);
256                }
257                break;
258        }
259
260        return true;
261    }
262
263    void sendEvent(int action, int flags) {
264        sendEvent(action, flags, SystemClock.uptimeMillis());
265    }
266
267    void sendEvent(int action, int flags, long when) {
268        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
269        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
270                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
271                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
272                InputDevice.SOURCE_KEYBOARD);
273        try {
274            //Slog.d(TAG, "injecting event " + ev);
275            mWindowManager.injectInputEventNoWait(ev);
276        } catch (RemoteException ex) {
277            // System process is dead
278        }
279    }
280}
281
282
283