1/*
2 * Copyright (C) 2015 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.support.v7.widget;
18
19import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
20
21import android.content.Context;
22import android.content.res.Resources;
23import android.graphics.drawable.Drawable;
24import android.os.Build;
25import android.support.annotation.NonNull;
26import android.support.annotation.RestrictTo;
27import android.support.v7.app.AppCompatDelegate;
28
29import java.lang.ref.WeakReference;
30
31/**
32 * This class allows us to intercept calls so that we can tint resources (if applicable), and
33 * inflate vector resources from within drawable containers pre-L.
34 *
35 * @hide
36 */
37@RestrictTo(LIBRARY_GROUP)
38public class VectorEnabledTintResources extends Resources {
39
40    public static boolean shouldBeUsed() {
41        return AppCompatDelegate.isCompatVectorFromResourcesEnabled()
42                && Build.VERSION.SDK_INT <= MAX_SDK_WHERE_REQUIRED;
43    }
44
45    /**
46     * The maximum API level where this class is needed.
47     */
48    public static final int MAX_SDK_WHERE_REQUIRED = 20;
49
50    private final WeakReference<Context> mContextRef;
51
52    public VectorEnabledTintResources(@NonNull final Context context,
53            @NonNull final Resources res) {
54        super(res.getAssets(), res.getDisplayMetrics(), res.getConfiguration());
55        mContextRef = new WeakReference<>(context);
56    }
57
58    /**
59     * We intercept this call so that we tint the result (if applicable). This is needed for
60     * things like {@link android.graphics.drawable.DrawableContainer}s which can retrieve
61     * their children via this method.
62     */
63    @Override
64    public Drawable getDrawable(int id) throws NotFoundException {
65        final Context context = mContextRef.get();
66        if (context != null) {
67            return AppCompatDrawableManager.get().onDrawableLoadedFromResources(context, this, id);
68        } else {
69            return super.getDrawable(id);
70        }
71    }
72
73    final Drawable superGetDrawable(int id) {
74        return super.getDrawable(id);
75    }
76}