1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5 * except in compliance with the License. You may obtain a copy of the License at
6 *
7 *      http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the
10 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11 * KIND, either express or implied. See the License for the specific language governing
12 * permissions and limitations under the License.
13 */
14package com.android.systemui;
15
16import android.annotation.Nullable;
17import android.content.Context;
18import android.content.res.TypedArray;
19import android.util.AttributeSet;
20import android.util.Log;
21import android.view.View;
22
23import com.android.systemui.plugins.PluginListener;
24import com.android.systemui.plugins.PluginManager;
25import com.android.systemui.plugins.ViewProvider;
26
27/**
28 * Define an interface or abstract class as follows that includes the
29 * version and action.
30 *
31 * public interface MyInterface {
32 *     public static final String ACTION =
33 *             "com.android.systemui.action.PLUGIN_MYINTERFACE";
34 *
35 *     public static final int VERSION = 1;
36 *
37 *     void myImportantInterface();
38 * }
39 *
40 * Then put in a PluginInflateContainer to use and specify the interface
41 * or class that will be implemented as viewType.  The layout specified
42 * will be used by default and whenever a plugin is not present.
43 *
44 * <com.android.systemui.PluginInflateContainer
45 *     android:id="@+id/some_id"
46 *     android:layout_width="match_parent"
47 *     android:layout_height="match_parent"
48 *     android:layout="@layout/my_default_component"
49 *     systemui:viewType="com.android.systemui.plugins.MyInterface" />
50 */
51public class PluginInflateContainer extends AutoReinflateContainer
52        implements PluginListener<ViewProvider> {
53
54    private static final String TAG = "PluginInflateContainer";
55
56    private Class<?> mClass;
57    private View mPluginView;
58
59    public PluginInflateContainer(Context context, @Nullable AttributeSet attrs) {
60        super(context, attrs);
61        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PluginInflateContainer);
62        String viewType = a.getString(R.styleable.PluginInflateContainer_viewType);
63        try {
64            mClass = Class.forName(viewType);
65        } catch (Exception e) {
66            Log.d(TAG, "Problem getting class info " + viewType, e);
67            mClass = null;
68        }
69    }
70
71    @Override
72    protected void onAttachedToWindow() {
73        super.onAttachedToWindow();
74        if (mClass != null) {
75            Dependency.get(PluginManager.class).addPluginListener(this, mClass);
76        }
77    }
78
79    @Override
80    protected void onDetachedFromWindow() {
81        super.onDetachedFromWindow();
82        if (mClass != null) {
83            Dependency.get(PluginManager.class).removePluginListener(this);
84        }
85    }
86
87    @Override
88    protected void inflateLayoutImpl() {
89        if (mPluginView != null) {
90            addView(mPluginView);
91        } else {
92            super.inflateLayoutImpl();
93        }
94    }
95
96    @Override
97    public void onPluginConnected(ViewProvider plugin, Context context) {
98        mPluginView = plugin.getView();
99        inflateLayout();
100    }
101
102    @Override
103    public void onPluginDisconnected(ViewProvider plugin) {
104        mPluginView = null;
105        inflateLayout();
106    }
107}
108