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 
17 package android.widget;
18 
19 import android.content.Context;
20 import android.os.Handler;
21 import android.util.AttributeSet;
22 import android.view.KeyEvent;
23 import android.view.MotionEvent;
24 import android.view.View;
25 import android.view.View.OnLongClickListener;
26 import android.view.accessibility.AccessibilityEvent;
27 import android.view.accessibility.AccessibilityNodeInfo;
28 
29 public 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 
ZoomButton(Context context)44     public ZoomButton(Context context) {
45         this(context, null);
46     }
47 
ZoomButton(Context context, AttributeSet attrs)48     public ZoomButton(Context context, AttributeSet attrs) {
49         this(context, attrs, 0);
50     }
51 
ZoomButton(Context context, AttributeSet attrs, int defStyleAttr)52     public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr) {
53         this(context, attrs, defStyleAttr, 0);
54     }
55 
ZoomButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)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
onTouchEvent(MotionEvent event)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 
setZoomSpeed(long speed)71     public void setZoomSpeed(long speed) {
72         mZoomSpeed = speed;
73     }
74 
onLongClick(View v)75     public boolean onLongClick(View v) {
76         mIsInLongpress = true;
77         mHandler.post(mRunnable);
78         return true;
79     }
80 
81     @Override
onKeyUp(int keyCode, KeyEvent event)82     public boolean onKeyUp(int keyCode, KeyEvent event) {
83         mIsInLongpress = false;
84         return super.onKeyUp(keyCode, event);
85     }
86 
87     @Override
setEnabled(boolean enabled)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
dispatchUnhandledMove(View focused, int direction)101     public boolean dispatchUnhandledMove(View focused, int direction) {
102         clearFocus();
103         return super.dispatchUnhandledMove(focused, direction);
104     }
105 
106     @Override
onInitializeAccessibilityEvent(AccessibilityEvent event)107     public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
108         super.onInitializeAccessibilityEvent(event);
109         event.setClassName(ZoomButton.class.getName());
110     }
111 
112     @Override
onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info)113     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
114         super.onInitializeAccessibilityNodeInfo(info);
115         info.setClassName(ZoomButton.class.getName());
116     }
117 }
118