ZoomButton.java revision 105925376f8d0f6b318c9938c7b83ef7fef094da 
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;
26
27public class ZoomButton extends ImageButton implements OnLongClickListener {
28
29    private final Handler mHandler;
30    private final Runnable mRunnable = new Runnable() {
31        public void run() {
32            if ((mOnClickListener != null) && mIsInLongpress && isEnabled()) {
33                mOnClickListener.onClick(ZoomButton.this);
34                mHandler.postDelayed(this, mZoomSpeed);
35            }
36        }
37    };
38
39    private long mZoomSpeed = 1000;
40    private boolean mIsInLongpress;
41
42    public ZoomButton(Context context) {
43        this(context, null);
44    }
45
46    public ZoomButton(Context context, AttributeSet attrs) {
47        this(context, attrs, 0);
48    }
49
50    public ZoomButton(Context context, AttributeSet attrs, int defStyle) {
51        super(context, attrs, defStyle);
52        mHandler = new Handler();
53        setOnLongClickListener(this);
54    }
55
56    @Override
57    public boolean onTouchEvent(MotionEvent event) {
58        if ((event.getAction() == MotionEvent.ACTION_CANCEL)
59                || (event.getAction() == MotionEvent.ACTION_UP)) {
60            mIsInLongpress = false;
61        }
62        return super.onTouchEvent(event);
63    }
64
65    public void setZoomSpeed(long speed) {
66        mZoomSpeed = speed;
67    }
68
69    public boolean onLongClick(View v) {
70        mIsInLongpress = true;
71        mHandler.post(mRunnable);
72        return true;
73    }
74
75    @Override
76    public boolean onKeyUp(int keyCode, KeyEvent event) {
77        mIsInLongpress = false;
78        return super.onKeyUp(keyCode, event);
79    }
80
81    @Override
82    public void setEnabled(boolean enabled) {
83        if (!enabled) {
84
85            /* If we're being disabled reset the state back to unpressed
86             * as disabled views don't get events and therefore we won't
87             * get the up event to reset the state.
88             */
89            setPressed(false);
90        }
91        super.setEnabled(enabled);
92    }
93
94    @Override
95    public boolean dispatchUnhandledMove(View focused, int direction) {
96        clearFocus();
97        return super.dispatchUnhandledMove(focused, direction);
98    }
99}
100