KeyButtonView.java revision ac14351e16e1258f1cb54e2bf772b8be004eb2b8 
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.hardware.input.InputManager;
27import android.os.RemoteException;
28import android.os.SystemClock;
29import android.os.ServiceManager;
30import android.util.AttributeSet;
31import android.view.accessibility.AccessibilityEvent;
32import android.view.HapticFeedbackConstants;
33import android.view.IWindowManager;
34import android.view.InputDevice;
35import android.view.KeyCharacterMap;
36import android.view.KeyEvent;
37import android.view.MotionEvent;
38import android.view.SoundEffectConstants;
39import android.view.View;
40import android.view.ViewConfiguration;
41import android.widget.ImageView;
42
43import com.android.systemui.R;
44
45public class KeyButtonView extends ImageView {
46    private static final String TAG = "StatusBar.KeyButtonView";
47
48    final float GLOW_MAX_SCALE_FACTOR = 1.8f;
49    final float BUTTON_QUIESCENT_ALPHA = 0.6f;
50
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    AnimatorSet mPressedAnim;
59
60    Runnable mCheckLongPress = new Runnable() {
61        public void run() {
62            if (isPressed()) {
63                // Slog.d("KeyButtonView", "longpressed: " + this);
64                if (mCode != 0) {
65                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
66                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
67                } else {
68                    // Just an old-fashioned ImageView
69                    performLongClick();
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        mGlowBG = a.getDrawable(R.styleable.KeyButtonView_glowBackground);
90        if (mGlowBG != null) {
91            setDrawingAlpha(BUTTON_QUIESCENT_ALPHA);
92        }
93
94        a.recycle();
95
96        setClickable(true);
97        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
98    }
99
100    @Override
101    protected void onDraw(Canvas canvas) {
102        if (mGlowBG != null) {
103            canvas.save();
104            final int w = getWidth();
105            final int h = getHeight();
106            canvas.scale(mGlowScale, mGlowScale, w*0.5f, h*0.5f);
107            mGlowBG.setBounds(0, 0, w, h);
108            mGlowBG.setAlpha((int)(mDrawingAlpha * mGlowAlpha * 255));
109            mGlowBG.draw(canvas);
110            canvas.restore();
111            mRect.right = w;
112            mRect.bottom = h;
113        }
114        super.onDraw(canvas);
115    }
116
117    public float getDrawingAlpha() {
118        if (mGlowBG == null) return 0;
119        return mDrawingAlpha;
120    }
121
122    public void setDrawingAlpha(float x) {
123        if (mGlowBG == null) return;
124        // Calling setAlpha(int), which is an ImageView-specific
125        // method that's different from setAlpha(float). This sets
126        // the alpha on this ImageView's drawable directly
127        setAlpha((int) (x * 255));
128        mDrawingAlpha = x;
129    }
130
131    public float getGlowAlpha() {
132        if (mGlowBG == null) return 0;
133        return mGlowAlpha;
134    }
135
136    public void setGlowAlpha(float x) {
137        if (mGlowBG == null) return;
138        mGlowAlpha = x;
139        invalidate();
140    }
141
142    public float getGlowScale() {
143        if (mGlowBG == null) return 0;
144        return mGlowScale;
145    }
146
147    public void setGlowScale(float x) {
148        if (mGlowBG == null) return;
149        mGlowScale = x;
150        final float w = getWidth();
151        final float h = getHeight();
152        if (GLOW_MAX_SCALE_FACTOR <= 1.0f) {
153            // this only works if we know the glow will never leave our bounds
154            invalidate();
155        } else {
156            final float rx = (w * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
157            final float ry = (h * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
158            com.android.systemui.SwipeHelper.invalidateGlobalRegion(
159                    this,
160                    new RectF(getLeft() - rx,
161                              getTop() - ry,
162                              getRight() + rx,
163                              getBottom() + ry));
164
165            // also invalidate our immediate parent to help avoid situations where nearby glows
166            // interfere
167            ((View)getParent()).invalidate();
168        }
169    }
170
171    public void setPressed(boolean pressed) {
172        if (mGlowBG != null) {
173            if (pressed != isPressed()) {
174                if (mPressedAnim != null && mPressedAnim.isRunning()) {
175                    mPressedAnim.cancel();
176                }
177                final AnimatorSet as = mPressedAnim = new AnimatorSet();
178                if (pressed) {
179                    if (mGlowScale < GLOW_MAX_SCALE_FACTOR)
180                        mGlowScale = GLOW_MAX_SCALE_FACTOR;
181                    if (mGlowAlpha < BUTTON_QUIESCENT_ALPHA)
182                        mGlowAlpha = BUTTON_QUIESCENT_ALPHA;
183                    setDrawingAlpha(1f);
184                    as.playTogether(
185                        ObjectAnimator.ofFloat(this, "glowAlpha", 1f),
186                        ObjectAnimator.ofFloat(this, "glowScale", GLOW_MAX_SCALE_FACTOR)
187                    );
188                    as.setDuration(50);
189                } else {
190                    as.playTogether(
191                        ObjectAnimator.ofFloat(this, "glowAlpha", 0f),
192                        ObjectAnimator.ofFloat(this, "glowScale", 1f),
193                        ObjectAnimator.ofFloat(this, "drawingAlpha", BUTTON_QUIESCENT_ALPHA)
194                    );
195                    as.setDuration(500);
196                }
197                as.start();
198            }
199        }
200        super.setPressed(pressed);
201    }
202
203    public boolean onTouchEvent(MotionEvent ev) {
204        final int action = ev.getAction();
205        int x, y;
206
207        switch (action) {
208            case MotionEvent.ACTION_DOWN:
209                //Slog.d("KeyButtonView", "press");
210                mDownTime = SystemClock.uptimeMillis();
211                setPressed(true);
212                if (mCode != 0) {
213                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
214                } else {
215                    // Provide the same haptic feedback that the system offers for virtual keys.
216                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
217                }
218                if (mSupportsLongpress) {
219                    removeCallbacks(mCheckLongPress);
220                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
221                }
222                break;
223            case MotionEvent.ACTION_MOVE:
224                x = (int)ev.getX();
225                y = (int)ev.getY();
226                setPressed(x >= -mTouchSlop
227                        && x < getWidth() + mTouchSlop
228                        && y >= -mTouchSlop
229                        && y < getHeight() + mTouchSlop);
230                break;
231            case MotionEvent.ACTION_CANCEL:
232                setPressed(false);
233                if (mCode != 0) {
234                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
235                }
236                if (mSupportsLongpress) {
237                    removeCallbacks(mCheckLongPress);
238                }
239                break;
240            case MotionEvent.ACTION_UP:
241                final boolean doIt = isPressed();
242                setPressed(false);
243                if (mCode != 0) {
244                    if (doIt) {
245                        sendEvent(KeyEvent.ACTION_UP, 0);
246                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
247                        playSoundEffect(SoundEffectConstants.CLICK);
248                    } else {
249                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
250                    }
251                } else {
252                    // no key code, just a regular ImageView
253                    if (doIt) {
254                        performClick();
255                    }
256                }
257                if (mSupportsLongpress) {
258                    removeCallbacks(mCheckLongPress);
259                }
260                break;
261        }
262
263        return true;
264    }
265
266    void sendEvent(int action, int flags) {
267        sendEvent(action, flags, SystemClock.uptimeMillis());
268    }
269
270    void sendEvent(int action, int flags, long when) {
271        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
272        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
273                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
274                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
275                InputDevice.SOURCE_KEYBOARD);
276        InputManager.injectInputEvent(ev, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
277    }
278}
279
280
281