1/*
2 * Copyright (C) 2017 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.wear.widget;
18
19import android.os.Bundle;
20import android.preference.PreferenceFragment;
21import android.support.wear.widget.SwipeDismissFrameLayout.Callback;
22import android.util.TypedValue;
23import android.view.LayoutInflater;
24import android.view.View;
25import android.view.ViewGroup;
26
27/**
28 * {@link PreferenceFragment} that supports swipe-to-dismiss.
29 *
30 * <p>Unlike a regular PreferenceFragment, this Fragment has a solid color background using the
31 * background color from the theme. This allows the fragment to be layered on top of other
32 * fragments so that the previous layer is seen when this fragment is swiped away.
33 */
34public class SwipeDismissPreferenceFragment extends PreferenceFragment {
35
36    private SwipeDismissFrameLayout mSwipeLayout;
37
38    private final Callback mCallback =
39            new Callback() {
40                @Override
41                public void onSwipeStarted(SwipeDismissFrameLayout layout) {
42                    SwipeDismissPreferenceFragment.this.onSwipeStart();
43                }
44
45                @Override
46                public void onSwipeCanceled(SwipeDismissFrameLayout layout) {
47                    SwipeDismissPreferenceFragment.this.onSwipeCancelled();
48                }
49
50                @Override
51                public void onDismissed(SwipeDismissFrameLayout layout) {
52                    SwipeDismissPreferenceFragment.this.onDismiss();
53                }
54            };
55
56    @Override
57    public View onCreateView(
58            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
59
60        mSwipeLayout = new SwipeDismissFrameLayout(getActivity());
61        mSwipeLayout.addCallback(mCallback);
62
63        View contents = super.onCreateView(inflater, mSwipeLayout, savedInstanceState);
64
65        mSwipeLayout.setBackgroundColor(getBackgroundColor());
66        mSwipeLayout.addView(contents);
67
68        return mSwipeLayout;
69    }
70
71    /** Called when the fragment is dismissed with a swipe. */
72    public void onDismiss() {
73    }
74
75    /** Called when a swipe-to-dismiss gesture is started. */
76    public void onSwipeStart() {
77    }
78
79    /** Called when a swipe-to-dismiss gesture is cancelled. */
80    public void onSwipeCancelled() {
81    }
82
83    /**
84     * Sets whether or not the preferences list can be focused. If {@code focusable} is false, any
85     * existing focus will be cleared.
86     */
87    public void setFocusable(boolean focusable) {
88        if (focusable) {
89            mSwipeLayout.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
90            mSwipeLayout.setFocusable(true);
91        } else {
92            // Prevent any child views from receiving focus.
93            mSwipeLayout.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
94
95            mSwipeLayout.setFocusable(false);
96            mSwipeLayout.clearFocus();
97        }
98    }
99
100    private int getBackgroundColor() {
101        TypedValue value = new TypedValue();
102        getActivity().getTheme().resolveAttribute(android.R.attr.colorBackground, value, true);
103        return value.data;
104    }
105}
106