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.internal.widget;
18
19import android.graphics.Rect;
20import android.os.Build;
21import android.support.v4.view.ViewCompat;
22import android.util.Log;
23import android.view.View;
24
25import java.lang.reflect.InvocationTargetException;
26import java.lang.reflect.Method;
27
28/**
29 * @hide
30 */
31public class ViewUtils {
32    private static final String TAG = "ViewUtils";
33
34    private static Method sComputeFitSystemWindowsMethod;
35
36    static {
37        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
38            try {
39                sComputeFitSystemWindowsMethod = View.class.getDeclaredMethod(
40                        "computeFitSystemWindows", Rect.class, Rect.class);
41                if (!sComputeFitSystemWindowsMethod.isAccessible()) {
42                    sComputeFitSystemWindowsMethod.setAccessible(true);
43                }
44            } catch (NoSuchMethodException e) {
45                Log.d(TAG, "Could not find method computeFitSystemWindows. Oh well.");
46            }
47        }
48    }
49
50    private ViewUtils() {}
51
52    public static boolean isLayoutRtl(View view) {
53        return ViewCompat.getLayoutDirection(view) == ViewCompat.LAYOUT_DIRECTION_RTL;
54    }
55
56    /**
57     * Merge two states as returned by {@link ViewCompat#getMeasuredState(android.view.View)} ()}.
58     * @param curState The current state as returned from a view or the result
59     * of combining multiple views.
60     * @param newState The new view state to combine.
61     * @return Returns a new integer reflecting the combination of the two
62     * states.
63     */
64    public static int combineMeasuredStates(int curState, int newState) {
65        return curState | newState;
66    }
67
68    /**
69     * Allow calling the hidden method {@code computeFitSystemWindows(Rect, Rect)} through
70     * reflection on {@code view}.
71     */
72    public static void computeFitSystemWindows(View view, Rect inoutInsets, Rect outLocalInsets) {
73        if (sComputeFitSystemWindowsMethod != null) {
74            try {
75                sComputeFitSystemWindowsMethod.invoke(view, inoutInsets, outLocalInsets);
76            } catch (Exception e) {
77                Log.d(TAG, "Could not invoke computeFitSystemWindows", e);
78            }
79        }
80    }
81
82    /**
83     * Allow calling the hidden method {@code makeOptionalFitsSystem()} through reflection on
84     * {@code view}.
85     */
86    public static void makeOptionalFitsSystemWindows(View view) {
87        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
88            try {
89                // We need to use getMethod() for makeOptionalFitsSystemWindows since both View
90                // and ViewGroup implement the method
91                Method method = view.getClass().getMethod("makeOptionalFitsSystemWindows");
92                if (!method.isAccessible()) {
93                    method.setAccessible(true);
94                }
95                method.invoke(view);
96            } catch (NoSuchMethodException e) {
97                Log.d(TAG, "Could not find method makeOptionalFitsSystemWindows. Oh well...");
98            } catch (InvocationTargetException e) {
99                Log.d(TAG, "Could not invoke makeOptionalFitsSystemWindows", e);
100            } catch (IllegalAccessException e) {
101                Log.d(TAG, "Could not invoke makeOptionalFitsSystemWindows", e);
102            }
103        }
104    }
105}
106