1/*
2 * Copyright (C) 2013 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.v4.graphics.drawable;
18
19import android.graphics.drawable.Drawable;
20
21/**
22 * Helper for accessing features in {@link android.graphics.drawable.Drawable}
23 * introduced after API level 4 in a backwards compatible fashion.
24 */
25public class DrawableCompat {
26    /**
27     * Interface for the full API.
28     */
29    interface DrawableImpl {
30        void jumpToCurrentState(Drawable drawable);
31        void setAutoMirrored(Drawable drawable, boolean mirrored);
32        boolean isAutoMirrored(Drawable drawable);
33    }
34
35    /**
36     * Interface implementation that doesn't use anything about v4 APIs.
37     */
38    static class BaseDrawableImpl implements DrawableImpl {
39        @Override
40        public void jumpToCurrentState(Drawable drawable) {
41        }
42
43        @Override
44        public void setAutoMirrored(Drawable drawable, boolean mirrored) {
45        }
46
47        @Override
48        public boolean isAutoMirrored(Drawable drawable) {
49            return false;
50        }
51    }
52
53    /**
54     * Interface implementation for devices with at least v11 APIs.
55     */
56    static class HoneycombDrawableImpl extends BaseDrawableImpl {
57        @Override
58        public void jumpToCurrentState(Drawable drawable) {
59            DrawableCompatHoneycomb.jumpToCurrentState(drawable);
60        }
61    }
62
63    /**
64     * Interface implementation for devices with at least v11 APIs.
65     */
66    static class KitKatDrawableImpl extends HoneycombDrawableImpl {
67        @Override
68        public void setAutoMirrored(Drawable drawable, boolean mirrored) {
69            DrawableCompatKitKat.setAutoMirrored(drawable, mirrored);
70        }
71
72        @Override
73        public boolean isAutoMirrored(Drawable drawable) {
74            return DrawableCompatKitKat.isAutoMirrored(drawable);
75        }
76    }
77
78    /**
79     * Select the correct implementation to use for the current platform.
80     */
81    static final DrawableImpl IMPL;
82    static {
83        final int version = android.os.Build.VERSION.SDK_INT;
84        if (version >= 19) {
85            IMPL = new KitKatDrawableImpl();
86        } else if (version >= 11) {
87            IMPL = new HoneycombDrawableImpl();
88        } else {
89            IMPL = new BaseDrawableImpl();
90        }
91    }
92
93    /**
94     * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()}.
95     * <p>
96     * If running on a pre-{@link android.os.Build.VERSION_CODES#HONEYCOMB}
97     * device this method does nothing.
98     *
99     * @param drawable The Drawable against which to invoke the method.
100     */
101    public static void jumpToCurrentState(Drawable drawable) {
102        IMPL.jumpToCurrentState(drawable);
103    }
104
105    /**
106     * Set whether this Drawable is automatically mirrored when its layout
107     * direction is RTL (right-to left). See
108     * {@link android.util.LayoutDirection}.
109     * <p>
110     * If running on a pre-{@link android.os.Build.VERSION_CODES#KITKAT} device
111     * this method does nothing.
112     *
113     * @param drawable The Drawable against which to invoke the method.
114     * @param mirrored Set to true if the Drawable should be mirrored, false if
115     *            not.
116     */
117    public static void setAutoMirrored(Drawable drawable, boolean mirrored) {
118        IMPL.setAutoMirrored(drawable, mirrored);
119    }
120
121    /**
122     * Tells if this Drawable will be automatically mirrored when its layout
123     * direction is RTL right-to-left. See {@link android.util.LayoutDirection}.
124     * <p>
125     * If running on a pre-{@link android.os.Build.VERSION_CODES#KITKAT} device
126     * this method returns false.
127     *
128     * @param drawable The Drawable against which to invoke the method.
129     * @return boolean Returns true if this Drawable will be automatically
130     *         mirrored.
131     */
132    public static boolean isAutoMirrored(Drawable drawable) {
133        return IMPL.isAutoMirrored(drawable);
134    }
135}
136