1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
2  * This Source Code Form is subject to the terms of the Mozilla Public
3  * License, v. 2.0. If a copy of the MPL was not distributed with this
4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 
6 package org.mozilla.gecko.home;
7 
8 import org.mozilla.gecko.R;
9 import org.mozilla.gecko.home.PanelLayout.DatasetBacked;
10 import org.mozilla.gecko.home.PanelLayout.PanelView;
11 import org.mozilla.gecko.widget.RecyclerViewClickSupport;
12 import org.mozilla.gecko.widget.RecyclerViewClickSupport.OnItemClickListener;
13 import org.mozilla.gecko.widget.RecyclerViewClickSupport.OnItemLongClickListener;
14 
15 import android.annotation.SuppressLint;
16 import android.content.Context;
17 import android.content.res.Resources;
18 import android.database.Cursor;
19 import android.support.v7.widget.GridLayoutManager;
20 import android.support.v7.widget.RecyclerView;
21 import android.view.View;
22 
23 /**
24  * RecyclerView implementation for grid home panels.
25  */
26 @SuppressLint("ViewConstructor") // View is only created from code
27 public class PanelRecyclerView extends RecyclerView
28         implements DatasetBacked, PanelView, OnItemClickListener, OnItemLongClickListener {
29     private final PanelRecyclerViewAdapter adapter;
30     private final GridLayoutManager layoutManager;
31     private final PanelViewItemHandler itemHandler;
32     private final float columnWidth;
33     private final boolean autoFit;
34     private final HomeConfig.ViewConfig viewConfig;
35 
36     private PanelLayout.OnItemOpenListener itemOpenListener;
37     private HomeContextMenuInfo contextMenuInfo;
38     private HomeContextMenuInfo.Factory contextMenuInfoFactory;
39 
PanelRecyclerView(Context context, HomeConfig.ViewConfig viewConfig)40     public PanelRecyclerView(Context context, HomeConfig.ViewConfig viewConfig) {
41         super(context);
42 
43         this.viewConfig = viewConfig;
44 
45         final Resources resources = context.getResources();
46 
47         int spanCount;
48         if (viewConfig.getItemType() == HomeConfig.ItemType.ICON) {
49             autoFit = false;
50             spanCount = getResources().getInteger(R.integer.panel_icon_grid_view_columns);
51         } else {
52             autoFit = true;
53             spanCount = 1;
54         }
55 
56         columnWidth = resources.getDimension(R.dimen.panel_grid_view_column_width);
57         layoutManager = new GridLayoutManager(context, spanCount);
58         adapter = new PanelRecyclerViewAdapter(context, viewConfig);
59         itemHandler = new PanelViewItemHandler();
60 
61         layoutManager.setSpanSizeLookup(new PanelSpanSizeLookup());
62 
63         setLayoutManager(layoutManager);
64         setAdapter(adapter);
65 
66         int horizontalSpacing = (int) resources.getDimension(R.dimen.panel_grid_view_horizontal_spacing);
67         int verticalSpacing = (int) resources.getDimension(R.dimen.panel_grid_view_vertical_spacing);
68         int outerSpacing = (int) resources.getDimension(R.dimen.panel_grid_view_outer_spacing);
69 
70         addItemDecoration(new SpacingDecoration(horizontalSpacing, verticalSpacing));
71 
72         setPadding(outerSpacing, outerSpacing, outerSpacing, outerSpacing);
73         setClipToPadding(false);
74 
75         RecyclerViewClickSupport.addTo(this)
76             .setOnItemClickListener(this)
77             .setOnItemLongClickListener(this);
78     }
79 
80     @Override
onMeasure(int widthSpec, int heightSpec)81     protected void onMeasure(int widthSpec, int heightSpec) {
82         super.onMeasure(widthSpec, heightSpec);
83 
84         if (autoFit) {
85             // Adjust span based on space available (What GridView does when you say numColumns="auto_fit")
86             final int spanCount = (int) Math.max(1, getMeasuredWidth() / columnWidth);
87             layoutManager.setSpanCount(spanCount);
88         }
89     }
90 
91     @Override
onAttachedToWindow()92     public void onAttachedToWindow() {
93         super.onAttachedToWindow();
94         itemHandler.setOnItemOpenListener(itemOpenListener);
95     }
96 
97     @Override
onDetachedFromWindow()98     public void onDetachedFromWindow() {
99         super.onDetachedFromWindow();
100         itemHandler.setOnItemOpenListener(null);
101     }
102 
103     @Override
setDataset(Cursor cursor)104     public void setDataset(Cursor cursor) {
105         adapter.swapCursor(cursor);
106     }
107 
108     @Override
setFilterManager(PanelLayout.FilterManager manager)109     public void setFilterManager(PanelLayout.FilterManager manager) {
110         adapter.setFilterManager(manager);
111         itemHandler.setFilterManager(manager);
112     }
113 
114     @Override
setOnItemOpenListener(PanelLayout.OnItemOpenListener listener)115     public void setOnItemOpenListener(PanelLayout.OnItemOpenListener listener) {
116         itemOpenListener = listener;
117         itemHandler.setOnItemOpenListener(listener);
118     }
119 
120     @Override
getContextMenuInfo()121     public HomeContextMenuInfo getContextMenuInfo() {
122         return contextMenuInfo;
123     }
124 
125     @Override
setContextMenuInfoFactory(HomeContextMenuInfo.Factory factory)126     public void setContextMenuInfoFactory(HomeContextMenuInfo.Factory factory) {
127         contextMenuInfoFactory = factory;
128     }
129 
130     @Override
onItemClicked(RecyclerView recyclerView, int position, View v)131     public void onItemClicked(RecyclerView recyclerView, int position, View v) {
132         if (viewConfig.hasHeaderConfig()) {
133             if (position == 0) {
134                 itemOpenListener.onItemOpen(viewConfig.getHeaderConfig().getUrl(), null);
135                 return;
136             }
137 
138             position--;
139         }
140 
141         itemHandler.openItemAtPosition(adapter.getCursor(), position);
142     }
143 
144     @Override
onItemLongClicked(RecyclerView recyclerView, int position, View v)145     public boolean onItemLongClicked(RecyclerView recyclerView, int position, View v) {
146         if (viewConfig.hasHeaderConfig()) {
147             if (position == 0) {
148                 final HomeConfig.HeaderConfig headerConfig = viewConfig.getHeaderConfig();
149 
150                 final HomeContextMenuInfo info = new HomeContextMenuInfo(v, position, -1);
151                 info.url = headerConfig.getUrl();
152                 info.title = headerConfig.getUrl();
153 
154                 contextMenuInfo = info;
155                 return showContextMenuForChild(this);
156             }
157 
158             position--;
159         }
160 
161         Cursor cursor = adapter.getCursor();
162         cursor.moveToPosition(position);
163 
164         contextMenuInfo = contextMenuInfoFactory.makeInfoForCursor(recyclerView, position, -1, cursor);
165         return showContextMenuForChild(this);
166     }
167 
168     private class PanelSpanSizeLookup extends GridLayoutManager.SpanSizeLookup {
169         @Override
getSpanSize(int position)170         public int getSpanSize(int position) {
171             if (position == 0 && viewConfig.hasHeaderConfig()) {
172                 return layoutManager.getSpanCount();
173             }
174 
175             return 1;
176         }
177     }
178 }
179