LayoutInflater_Delegate.java revision 9a4fe29c8d92014d2d9a848e9116b8cc9d0842f9 
1/*
2 * Copyright (C) 2011 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.view;
18
19import com.android.layoutlib.bridge.android.BridgeInflater;
20import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
21
22import org.xmlpull.v1.XmlPullParser;
23import org.xmlpull.v1.XmlPullParserException;
24
25import android.util.AttributeSet;
26
27import java.io.IOException;
28
29/**
30 * Delegate used to provide new implementation of a select few methods of {@link LayoutInflater}
31 *
32 * Through the layoutlib_create tool, the original  methods of LayoutInflater have been replaced
33 * by calls to methods of the same name in this delegate class.
34 *
35 */
36public class LayoutInflater_Delegate {
37
38    /**
39     * Recursive method used to descend down the xml hierarchy and instantiate
40     * views, instantiate their children, and then call onFinishInflate().
41     */
42    @LayoutlibDelegate
43    /*package*/ static void rInflate(LayoutInflater thisInflater,
44            XmlPullParser parser, View parent, final AttributeSet attrs,
45            boolean finishInflate) throws XmlPullParserException, IOException {
46
47        if (finishInflate == false) {
48            // this is a merge rInflate!
49            if (thisInflater instanceof BridgeInflater) {
50                ((BridgeInflater) thisInflater).setIsInMerge(true);
51            }
52        }
53
54        // ---- START DEFAULT IMPLEMENTATION.
55
56        final int depth = parser.getDepth();
57        int type;
58
59        while (((type = parser.next()) != XmlPullParser.END_TAG ||
60                parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) {
61
62            if (type != XmlPullParser.START_TAG) {
63                continue;
64            }
65
66            final String name = parser.getName();
67
68            if (LayoutInflater.TAG_REQUEST_FOCUS.equals(name)) {
69                thisInflater.parseRequestFocus(parser, parent);
70            } else if (LayoutInflater.TAG_INCLUDE.equals(name)) {
71                if (parser.getDepth() == 0) {
72                    throw new InflateException("<include /> cannot be the root element");
73                }
74                thisInflater.parseInclude(parser, parent, attrs);
75            } else if (LayoutInflater.TAG_MERGE.equals(name)) {
76                throw new InflateException("<merge /> must be the root element");
77            } else {
78                final View view = thisInflater.createViewFromTag(parent, name, attrs);
79                final ViewGroup viewGroup = (ViewGroup) parent;
80                final ViewGroup.LayoutParams params = viewGroup.generateLayoutParams(attrs);
81                thisInflater.rInflate(parser, view, attrs, true);
82                viewGroup.addView(view, params);
83            }
84        }
85
86        if (finishInflate) parent.onFinishInflate();
87
88        // ---- END DEFAULT IMPLEMENTATION.
89
90        if (finishInflate == false) {
91            // this is a merge rInflate!
92            if (thisInflater instanceof BridgeInflater) {
93                ((BridgeInflater) thisInflater).setIsInMerge(false);
94            }
95        }
96    }
97}
98