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 android.widget;
18
19import android.content.Context;
20import android.os.Handler;
21import android.util.AttributeSet;
22import android.view.KeyEvent;
23import android.view.MotionEvent;
24import android.view.View;
25import android.view.View.OnLongClickListener;
26import android.view.accessibility.AccessibilityEvent;
27import android.view.accessibility.AccessibilityNodeInfo;
28
29public class ZoomButton extends ImageButton implements OnLongClickListener {
30
31    private final Handler mHandler;
32    private final Runnable mRunnable = new Runnable() {
33        public void run() {
34            if (hasOnClickListeners() && mIsInLongpress && isEnabled()) {
35                callOnClick();
36                mHandler.postDelayed(this, mZoomSpeed);
37            }
38        }
39    };
40
41    private long mZoomSpeed = 1000;
42    private boolean mIsInLongpress;
43
44    public ZoomButton(Context context) {
45        this(context, null);
46    }
47
48    public ZoomButton(Context context, AttributeSet attrs) {
49        this(context, attrs, 0);
50    }
51
52    public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr) {
53        this(context, attrs, defStyleAttr, 0);
54    }
55
56    public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
57        super(context, attrs, defStyleAttr, defStyleRes);
58        mHandler = new Handler();
59        setOnLongClickListener(this);
60    }
61
62    @Override
63    public boolean onTouchEvent(MotionEvent event) {
64        if ((event.getAction() == MotionEvent.ACTION_CANCEL)
65                || (event.getAction() == MotionEvent.ACTION_UP)) {
66            mIsInLongpress = false;
67        }
68        return super.onTouchEvent(event);
69    }
70
71    public void setZoomSpeed(long speed) {
72        mZoomSpeed = speed;
73    }
74
75    public boolean onLongClick(View v) {
76        mIsInLongpress = true;
77        mHandler.post(mRunnable);
78        return true;
79    }
80
81    @Override
82    public boolean onKeyUp(int keyCode, KeyEvent event) {
83        mIsInLongpress = false;
84        return super.onKeyUp(keyCode, event);
85    }
86
87    @Override
88    public void setEnabled(boolean enabled) {
89        if (!enabled) {
90
91            /* If we're being disabled reset the state back to unpressed
92             * as disabled views don't get events and therefore we won't
93             * get the up event to reset the state.
94             */
95            setPressed(false);
96        }
97        super.setEnabled(enabled);
98    }
99
100    @Override
101    public boolean dispatchUnhandledMove(View focused, int direction) {
102        clearFocus();
103        return super.dispatchUnhandledMove(focused, direction);
104    }
105
106    @Override
107    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
108        super.onInitializeAccessibilityEvent(event);
109        event.setClassName(ZoomButton.class.getName());
110    }
111
112    @Override
113    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
114        super.onInitializeAccessibilityNodeInfo(info);
115        info.setClassName(ZoomButton.class.getName());
116    }
117}
118