1/*
2 * Copyright (C) 2014 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.graphics.Rect;
22import android.os.Build;
23import android.support.annotation.RestrictTo;
24import android.support.v4.view.ViewCompat;
25import android.util.Log;
26import android.view.View;
27
28import java.lang.reflect.InvocationTargetException;
29import java.lang.reflect.Method;
30
31/**
32 * @hide
33 */
34@RestrictTo(LIBRARY_GROUP)
35public class ViewUtils {
36    private static final String TAG = "ViewUtils";
37
38    private static Method sComputeFitSystemWindowsMethod;
39
40    static {
41        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
42            try {
43                sComputeFitSystemWindowsMethod = View.class.getDeclaredMethod(
44                        "computeFitSystemWindows", Rect.class, Rect.class);
45                if (!sComputeFitSystemWindowsMethod.isAccessible()) {
46                    sComputeFitSystemWindowsMethod.setAccessible(true);
47                }
48            } catch (NoSuchMethodException e) {
49                Log.d(TAG, "Could not find method computeFitSystemWindows. Oh well.");
50            }
51        }
52    }
53
54    private ViewUtils() {}
55
56    public static boolean isLayoutRtl(View view) {
57        return ViewCompat.getLayoutDirection(view) == ViewCompat.LAYOUT_DIRECTION_RTL;
58    }
59
60    /**
61     * Merge two states as returned by {@link View#getMeasuredState()} ()}.
62     * @param curState The current state as returned from a view or the result
63     * of combining multiple views.
64     * @param newState The new view state to combine.
65     * @return Returns a new integer reflecting the combination of the two
66     * states.
67     *
68     * @deprecated Use {@link View#combineMeasuredStates(int, int)} directly.
69     */
70    @Deprecated
71    public static int combineMeasuredStates(int curState, int newState) {
72        return View.combineMeasuredStates(curState, newState);
73    }
74
75    /**
76     * Allow calling the hidden method {@code computeFitSystemWindows(Rect, Rect)} through
77     * reflection on {@code view}.
78     */
79    public static void computeFitSystemWindows(View view, Rect inoutInsets, Rect outLocalInsets) {
80        if (sComputeFitSystemWindowsMethod != null) {
81            try {
82                sComputeFitSystemWindowsMethod.invoke(view, inoutInsets, outLocalInsets);
83            } catch (Exception e) {
84                Log.d(TAG, "Could not invoke computeFitSystemWindows", e);
85            }
86        }
87    }
88
89    /**
90     * Allow calling the hidden method {@code makeOptionalFitsSystem()} through reflection on
91     * {@code view}.
92     */
93    public static void makeOptionalFitsSystemWindows(View view) {
94        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
95            try {
96                // We need to use getMethod() for makeOptionalFitsSystemWindows since both View
97                // and ViewGroup implement the method
98                Method method = view.getClass().getMethod("makeOptionalFitsSystemWindows");
99                if (!method.isAccessible()) {
100                    method.setAccessible(true);
101                }
102                method.invoke(view);
103            } catch (NoSuchMethodException e) {
104                Log.d(TAG, "Could not find method makeOptionalFitsSystemWindows. Oh well...");
105            } catch (InvocationTargetException e) {
106                Log.d(TAG, "Could not invoke makeOptionalFitsSystemWindows", e);
107            } catch (IllegalAccessException e) {
108                Log.d(TAG, "Could not invoke makeOptionalFitsSystemWindows", e);
109            }
110        }
111    }
112}
113