1/*
2 * Copyright (C) 2009 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.launcher2;
18
19import android.appwidget.AppWidgetHostView;
20import android.content.Context;
21import android.view.LayoutInflater;
22import android.view.MotionEvent;
23import android.view.View;
24import android.view.ViewConfiguration;
25import android.view.ViewGroup;
26
27import com.android.launcher.R;
28
29/**
30 * {@inheritDoc}
31 */
32public class LauncherAppWidgetHostView extends AppWidgetHostView {
33    private boolean mHasPerformedLongPress;
34    private CheckForLongPress mPendingCheckForLongPress;
35    private LayoutInflater mInflater;
36
37    public LauncherAppWidgetHostView(Context context) {
38        super(context);
39        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
40    }
41
42    @Override
43    protected View getErrorView() {
44        return mInflater.inflate(R.layout.appwidget_error, this, false);
45    }
46
47    public boolean onInterceptTouchEvent(MotionEvent ev) {
48        // Consume any touch events for ourselves after longpress is triggered
49        if (mHasPerformedLongPress) {
50            mHasPerformedLongPress = false;
51            return true;
52        }
53
54        // Watch for longpress events at this level to make sure
55        // users can always pick up this widget
56        switch (ev.getAction()) {
57            case MotionEvent.ACTION_DOWN: {
58                postCheckForLongClick();
59                break;
60            }
61
62            case MotionEvent.ACTION_UP:
63            case MotionEvent.ACTION_CANCEL:
64                mHasPerformedLongPress = false;
65                if (mPendingCheckForLongPress != null) {
66                    removeCallbacks(mPendingCheckForLongPress);
67                }
68                break;
69        }
70
71        // Otherwise continue letting touch events fall through to children
72        return false;
73    }
74
75    class CheckForLongPress implements Runnable {
76        private int mOriginalWindowAttachCount;
77
78        public void run() {
79            if ((mParent != null) && hasWindowFocus()
80                    && mOriginalWindowAttachCount == getWindowAttachCount()
81                    && !mHasPerformedLongPress) {
82                if (performLongClick()) {
83                    mHasPerformedLongPress = true;
84                }
85            }
86        }
87
88        public void rememberWindowAttachCount() {
89            mOriginalWindowAttachCount = getWindowAttachCount();
90        }
91    }
92
93    private void postCheckForLongClick() {
94        mHasPerformedLongPress = false;
95
96        if (mPendingCheckForLongPress == null) {
97            mPendingCheckForLongPress = new CheckForLongPress();
98        }
99        mPendingCheckForLongPress.rememberWindowAttachCount();
100        postDelayed(mPendingCheckForLongPress, ViewConfiguration.getLongPressTimeout());
101    }
102
103    @Override
104    public void cancelLongPress() {
105        super.cancelLongPress();
106
107        mHasPerformedLongPress = false;
108        if (mPendingCheckForLongPress != null) {
109            removeCallbacks(mPendingCheckForLongPress);
110        }
111    }
112
113    @Override
114    public int getDescendantFocusability() {
115        return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
116    }
117}
118