ZoomButton.java revision d0374c6b25c3ad8e638827bd8190553f80d9bf22 
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.util.AttributeSet;
21import android.view.KeyEvent;
22import android.view.MotionEvent;
23import android.view.View;
24import android.view.View.OnLongClickListener;
25
26public class ZoomButton extends ImageButton implements OnLongClickListener {
27
28    private final Runnable mRunnable = new Runnable() {
29        public void run() {
30            if (hasOnClickListeners() && mIsInLongpress && isEnabled()) {
31                callOnClick();
32                postDelayed(this, mZoomSpeed);
33            }
34        }
35    };
36
37    private long mZoomSpeed = 1000;
38    private boolean mIsInLongpress;
39
40    public ZoomButton(Context context) {
41        this(context, null);
42    }
43
44    public ZoomButton(Context context, AttributeSet attrs) {
45        this(context, attrs, 0);
46    }
47
48    public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr) {
49        this(context, attrs, defStyleAttr, 0);
50    }
51
52    public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
53        super(context, attrs, defStyleAttr, defStyleRes);
54        setOnLongClickListener(this);
55    }
56
57    @Override
58    public boolean onTouchEvent(MotionEvent event) {
59        if ((event.getAction() == MotionEvent.ACTION_CANCEL)
60                || (event.getAction() == MotionEvent.ACTION_UP)) {
61            mIsInLongpress = false;
62        }
63        return super.onTouchEvent(event);
64    }
65
66    public void setZoomSpeed(long speed) {
67        mZoomSpeed = speed;
68    }
69
70    public boolean onLongClick(View v) {
71        mIsInLongpress = true;
72        post(mRunnable);
73        return true;
74    }
75
76    @Override
77    public boolean onKeyUp(int keyCode, KeyEvent event) {
78        mIsInLongpress = false;
79        return super.onKeyUp(keyCode, event);
80    }
81
82    @Override
83    public void setEnabled(boolean enabled) {
84        if (!enabled) {
85
86            /* If we're being disabled reset the state back to unpressed
87             * as disabled views don't get events and therefore we won't
88             * get the up event to reset the state.
89             */
90            setPressed(false);
91        }
92        super.setEnabled(enabled);
93    }
94
95    @Override
96    public boolean dispatchUnhandledMove(View focused, int direction) {
97        clearFocus();
98        return super.dispatchUnhandledMove(focused, direction);
99    }
100
101    @Override
102    public CharSequence getAccessibilityClassName() {
103        return ZoomButton.class.getName();
104    }
105}
106