/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.view; import com.android.tools.layoutlib.annotations.LayoutlibDelegate; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import android.content.Context; import android.content.res.TypedArray; import android.content.res.XmlResourceParser; import android.util.AttributeSet; import android.util.TypedValue; import android.util.Xml; import java.io.IOException; /** * Delegate used to provide new implementation of a select few methods of {@link LayoutInflater} * * Through the layoutlib_create tool, the original methods of LayoutInflater have been replaced * by calls to methods of the same name in this delegate class. * */ public class LayoutInflater_Delegate { private static final String TAG_MERGE = "merge"; private static final String ATTR_LAYOUT = "layout"; private static final int[] ATTRS_THEME = new int[] { com.android.internal.R.attr.theme }; public static boolean sIsInInclude = false; /** * Recursive method used to descend down the xml hierarchy and instantiate * views, instantiate their children, and then call onFinishInflate(). * * This implementation just records the merge status before calling the default implementation. */ @LayoutlibDelegate /* package */ static void rInflate(LayoutInflater thisInflater, XmlPullParser parser, View parent, Context context, AttributeSet attrs, boolean finishInflate) throws XmlPullParserException, IOException { if (finishInflate == false) { // this is a merge rInflate! if (thisInflater instanceof BridgeInflater) { ((BridgeInflater) thisInflater).setIsInMerge(true); } } // ---- START DEFAULT IMPLEMENTATION. thisInflater.rInflate_Original(parser, parent, context, attrs, finishInflate); // ---- END DEFAULT IMPLEMENTATION. if (finishInflate == false) { // this is a merge rInflate! if (thisInflater instanceof BridgeInflater) { ((BridgeInflater) thisInflater).setIsInMerge(false); } } } @LayoutlibDelegate public static void parseInclude(LayoutInflater thisInflater, XmlPullParser parser, Context context, View parent, AttributeSet attrs) throws XmlPullParserException, IOException { int type; if (parent instanceof ViewGroup) { // Apply a theme wrapper, if requested. This is sort of a weird // edge case, since developers think the overwrites // values in the AttributeSet of the included View. So, if the // included View has a theme attribute, we'll need to ignore it. final TypedArray ta = context.obtainStyledAttributes(attrs, ATTRS_THEME); final int themeResId = ta.getResourceId(0, 0); final boolean hasThemeOverride = themeResId != 0; if (hasThemeOverride) { context = new ContextThemeWrapper(context, themeResId); } ta.recycle(); // If the layout is pointing to a theme attribute, we have to // massage the value to get a resource identifier out of it. int layout = attrs.getAttributeResourceValue(null, ATTR_LAYOUT, 0); if (layout == 0) { final String value = attrs.getAttributeValue(null, ATTR_LAYOUT); if (value == null || value.length() <= 0) { throw new InflateException("You must specify a layout in the" + " include tag: "); } // Attempt to resolve the "?attr/name" string to an identifier. layout = context.getResources().getIdentifier(value.substring(1), null, null); } // The layout might be referencing a theme attribute. // ---- START CHANGES if (layout != 0) { final TypedValue tempValue = new TypedValue(); if (context.getTheme().resolveAttribute(layout, tempValue, true)) { layout = tempValue.resourceId; } } // ---- END CHANGES if (layout == 0) { final String value = attrs.getAttributeValue(null, ATTR_LAYOUT); if (value == null) { throw new InflateException("You must specifiy a layout in the" + " include tag: "); } else { throw new InflateException("You must specifiy a valid layout " + "reference. The layout ID " + value + " is not valid."); } } else { final XmlResourceParser childParser = thisInflater.getContext().getResources().getLayout(layout); try { final AttributeSet childAttrs = Xml.asAttributeSet(childParser); while ((type = childParser.next()) != XmlPullParser.START_TAG && type != XmlPullParser.END_DOCUMENT) { // Empty. } if (type != XmlPullParser.START_TAG) { throw new InflateException(childParser.getPositionDescription() + ": No start tag found!"); } final String childName = childParser.getName(); if (TAG_MERGE.equals(childName)) { // Inflate all children. thisInflater.rInflate(childParser, parent, context, childAttrs, false); } else { final View view = thisInflater.createViewFromTag(parent, childName, context, childAttrs, hasThemeOverride); final ViewGroup group = (ViewGroup) parent; final TypedArray a = context.obtainStyledAttributes( attrs, com.android.internal.R.styleable.Include); final int id = a.getResourceId( com.android.internal.R.styleable.Include_id, View.NO_ID); final int visibility = a.getInt( com.android.internal.R.styleable.Include_visibility, -1); a.recycle(); // We try to load the layout params set in the tag. If // they don't exist, we will rely on the layout params set in the // included XML file. // During a layoutparams generation, a runtime exception is thrown // if either layout_width or layout_height is missing. We catch // this exception and set localParams accordingly: true means we // successfully loaded layout params from the tag, // false means we need to rely on the included layout params. ViewGroup.LayoutParams params = null; try { // ---- START CHANGES sIsInInclude = true; // ---- END CHANGES params = group.generateLayoutParams(attrs); } catch (RuntimeException ignored) { // Ignore, just fail over to child attrs. } finally { // ---- START CHANGES sIsInInclude = false; // ---- END CHANGES } if (params == null) { params = group.generateLayoutParams(childAttrs); } view.setLayoutParams(params); // Inflate all children. thisInflater.rInflateChildren(childParser, view, childAttrs, true); if (id != View.NO_ID) { view.setId(id); } switch (visibility) { case 0: view.setVisibility(View.VISIBLE); break; case 1: view.setVisibility(View.INVISIBLE); break; case 2: view.setVisibility(View.GONE); break; } group.addView(view); } } finally { childParser.close(); } } } else { throw new InflateException(" can only be used inside of a ViewGroup"); } LayoutInflater.consumeChildElements(parser); } }