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 = 0.70f;
50
51    long mDownTime;
52    int mCode;
53    int mTouchSlop;
54    Drawable mGlowBG;
55    int mGlowWidth, mGlowHeight;
56    float mGlowAlpha = 0f, mGlowScale = 1f, mDrawingAlpha = 1f;
57    boolean mSupportsLongpress = true;
58    RectF mRect = new RectF(0f,0f,0f,0f);
59    AnimatorSet mPressedAnim;
60
61    Runnable mCheckLongPress = new Runnable() {
62        public void run() {
63            if (isPressed()) {
64                // Slog.d("KeyButtonView", "longpressed: " + this);
65                if (mCode != 0) {
66                    sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS);
67                    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
68                } else {
69                    // Just an old-fashioned ImageView
70                    performLongClick();
71                }
72            }
73        }
74    };
75
76    public KeyButtonView(Context context, AttributeSet attrs) {
77        this(context, attrs, 0);
78    }
79
80    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
81        super(context, attrs);
82
83        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyButtonView,
84                defStyle, 0);
85
86        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
87
88        mSupportsLongpress = a.getBoolean(R.styleable.KeyButtonView_keyRepeat, true);
89
90        mGlowBG = a.getDrawable(R.styleable.KeyButtonView_glowBackground);
91        if (mGlowBG != null) {
92            setDrawingAlpha(BUTTON_QUIESCENT_ALPHA);
93            mGlowWidth = mGlowBG.getIntrinsicWidth();
94            mGlowHeight = mGlowBG.getIntrinsicHeight();
95        }
96
97        a.recycle();
98
99        setClickable(true);
100        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
101    }
102
103    @Override
104    protected void onDraw(Canvas canvas) {
105        if (mGlowBG != null) {
106            canvas.save();
107            final int w = getWidth();
108            final int h = getHeight();
109            final float aspect = (float)mGlowWidth / mGlowHeight;
110            final int drawW = (int)(h*aspect);
111            final int drawH = h;
112            final int margin = (drawW-w)/2;
113            canvas.scale(mGlowScale, mGlowScale, w*0.5f, h*0.5f);
114            mGlowBG.setBounds(-margin, 0, drawW-margin, drawH);
115            mGlowBG.setAlpha((int)(mDrawingAlpha * mGlowAlpha * 255));
116            mGlowBG.draw(canvas);
117            canvas.restore();
118            mRect.right = w;
119            mRect.bottom = h;
120        }
121        super.onDraw(canvas);
122    }
123
124    public float getDrawingAlpha() {
125        if (mGlowBG == null) return 0;
126        return mDrawingAlpha;
127    }
128
129    public void setDrawingAlpha(float x) {
130        if (mGlowBG == null) return;
131        // Calling setAlpha(int), which is an ImageView-specific
132        // method that's different from setAlpha(float). This sets
133        // the alpha on this ImageView's drawable directly
134        setAlpha((int) (x * 255));
135        mDrawingAlpha = x;
136    }
137
138    public float getGlowAlpha() {
139        if (mGlowBG == null) return 0;
140        return mGlowAlpha;
141    }
142
143    public void setGlowAlpha(float x) {
144        if (mGlowBG == null) return;
145        mGlowAlpha = x;
146        invalidate();
147    }
148
149    public float getGlowScale() {
150        if (mGlowBG == null) return 0;
151        return mGlowScale;
152    }
153
154    public void setGlowScale(float x) {
155        if (mGlowBG == null) return;
156        mGlowScale = x;
157        final float w = getWidth();
158        final float h = getHeight();
159        if (GLOW_MAX_SCALE_FACTOR <= 1.0f) {
160            // this only works if we know the glow will never leave our bounds
161            invalidate();
162        } else {
163            final float rx = (w * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
164            final float ry = (h * (GLOW_MAX_SCALE_FACTOR - 1.0f)) / 2.0f + 1.0f;
165            com.android.systemui.SwipeHelper.invalidateGlobalRegion(
166                    this,
167                    new RectF(getLeft() - rx,
168                              getTop() - ry,
169                              getRight() + rx,
170                              getBottom() + ry));
171
172            // also invalidate our immediate parent to help avoid situations where nearby glows
173            // interfere
174            ((View)getParent()).invalidate();
175        }
176    }
177
178    public void setPressed(boolean pressed) {
179        if (mGlowBG != null) {
180            if (pressed != isPressed()) {
181                if (mPressedAnim != null && mPressedAnim.isRunning()) {
182                    mPressedAnim.cancel();
183                }
184                final AnimatorSet as = mPressedAnim = new AnimatorSet();
185                if (pressed) {
186                    if (mGlowScale < GLOW_MAX_SCALE_FACTOR)
187                        mGlowScale = GLOW_MAX_SCALE_FACTOR;
188                    if (mGlowAlpha < BUTTON_QUIESCENT_ALPHA)
189                        mGlowAlpha = BUTTON_QUIESCENT_ALPHA;
190                    setDrawingAlpha(1f);
191                    as.playTogether(
192                        ObjectAnimator.ofFloat(this, "glowAlpha", 1f),
193                        ObjectAnimator.ofFloat(this, "glowScale", GLOW_MAX_SCALE_FACTOR)
194                    );
195                    as.setDuration(50);
196                } else {
197                    as.playTogether(
198                        ObjectAnimator.ofFloat(this, "glowAlpha", 0f),
199                        ObjectAnimator.ofFloat(this, "glowScale", 1f),
200                        ObjectAnimator.ofFloat(this, "drawingAlpha", BUTTON_QUIESCENT_ALPHA)
201                    );
202                    as.setDuration(500);
203                }
204                as.start();
205            }
206        }
207        super.setPressed(pressed);
208    }
209
210    public boolean onTouchEvent(MotionEvent ev) {
211        final int action = ev.getAction();
212        int x, y;
213
214        switch (action) {
215            case MotionEvent.ACTION_DOWN:
216                //Slog.d("KeyButtonView", "press");
217                mDownTime = SystemClock.uptimeMillis();
218                setPressed(true);
219                if (mCode != 0) {
220                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
221                } else {
222                    // Provide the same haptic feedback that the system offers for virtual keys.
223                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
224                }
225                if (mSupportsLongpress) {
226                    removeCallbacks(mCheckLongPress);
227                    postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
228                }
229                break;
230            case MotionEvent.ACTION_MOVE:
231                x = (int)ev.getX();
232                y = (int)ev.getY();
233                setPressed(x >= -mTouchSlop
234                        && x < getWidth() + mTouchSlop
235                        && y >= -mTouchSlop
236                        && y < getHeight() + mTouchSlop);
237                break;
238            case MotionEvent.ACTION_CANCEL:
239                setPressed(false);
240                if (mCode != 0) {
241                    sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
242                }
243                if (mSupportsLongpress) {
244                    removeCallbacks(mCheckLongPress);
245                }
246                break;
247            case MotionEvent.ACTION_UP:
248                final boolean doIt = isPressed();
249                setPressed(false);
250                if (mCode != 0) {
251                    if (doIt) {
252                        sendEvent(KeyEvent.ACTION_UP, 0);
253                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
254                        playSoundEffect(SoundEffectConstants.CLICK);
255                    } else {
256                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
257                    }
258                } else {
259                    // no key code, just a regular ImageView
260                    if (doIt) {
261                        performClick();
262                    }
263                }
264                if (mSupportsLongpress) {
265                    removeCallbacks(mCheckLongPress);
266                }
267                break;
268        }
269
270        return true;
271    }
272
273    void sendEvent(int action, int flags) {
274        sendEvent(action, flags, SystemClock.uptimeMillis());
275    }
276
277    void sendEvent(int action, int flags, long when) {
278        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
279        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
280                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
281                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
282                InputDevice.SOURCE_KEYBOARD);
283        InputManager.getInstance().injectInputEvent(ev,
284                InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
285    }
286}
287
288
289