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 package com.android.contacts.common.list;
17 
18 import android.content.Context;
19 import android.content.res.ColorStateList;
20 import android.content.res.TypedArray;
21 import android.graphics.Outline;
22 import android.support.v4.view.PagerAdapter;
23 import android.support.v4.view.ViewPager;
24 import android.util.AttributeSet;
25 import android.util.TypedValue;
26 import android.view.Gravity;
27 import android.view.LayoutInflater;
28 import android.view.View;
29 import android.view.ViewOutlineProvider;
30 import android.widget.FrameLayout;
31 import android.widget.HorizontalScrollView;
32 import android.widget.LinearLayout;
33 import android.widget.TextView;
34 import android.widget.Toast;
35 import com.android.dialer.contacts.resources.R;
36 
37 /**
38  * Lightweight implementation of ViewPager tabs. This looks similar to traditional actionBar tabs,
39  * but allows for the view containing the tabs to be placed anywhere on screen. Text-related
40  * attributes can also be assigned in XML - these will get propogated to the child TextViews
41  * automatically.
42  */
43 public class ViewPagerTabs extends HorizontalScrollView implements ViewPager.OnPageChangeListener {
44 
45   private static final ViewOutlineProvider VIEW_BOUNDS_OUTLINE_PROVIDER =
46       new ViewOutlineProvider() {
47         @Override
48         public void getOutline(View view, Outline outline) {
49           outline.setRect(0, 0, view.getWidth(), view.getHeight());
50         }
51       };
52   private static final int TAB_SIDE_PADDING_IN_DPS = 10;
53   // TODO: This should use <declare-styleable> in the future
54   private static final int[] ATTRS =
55       new int[] {
56         android.R.attr.textSize,
57         android.R.attr.textStyle,
58         android.R.attr.textColor,
59         android.R.attr.textAllCaps
60       };
61 
62   /**
63    * Linearlayout that will contain the TextViews serving as tabs. This is the only child of the
64    * parent HorizontalScrollView.
65    */
66   final int mTextStyle;
67 
68   final ColorStateList mTextColor;
69   final int mTextSize;
70   final boolean mTextAllCaps;
71   ViewPager mPager;
72   int mPrevSelected = -1;
73   int mSidePadding;
74   private ViewPagerTabStrip mTabStrip;
75   private int[] mTabIcons;
76   // For displaying the unread count next to the tab icon.
77   private int[] mUnreadCounts;
78 
ViewPagerTabs(Context context)79   public ViewPagerTabs(Context context) {
80     this(context, null);
81   }
82 
ViewPagerTabs(Context context, AttributeSet attrs)83   public ViewPagerTabs(Context context, AttributeSet attrs) {
84     this(context, attrs, 0);
85   }
86 
ViewPagerTabs(Context context, AttributeSet attrs, int defStyle)87   public ViewPagerTabs(Context context, AttributeSet attrs, int defStyle) {
88     super(context, attrs, defStyle);
89     setFillViewport(true);
90 
91     mSidePadding = (int) (getResources().getDisplayMetrics().density * TAB_SIDE_PADDING_IN_DPS);
92 
93     final TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);
94     mTextSize = a.getDimensionPixelSize(0, 0);
95     mTextStyle = a.getInt(1, 0);
96     mTextColor = a.getColorStateList(2);
97     mTextAllCaps = a.getBoolean(3, false);
98 
99     mTabStrip = new ViewPagerTabStrip(context);
100     addView(
101         mTabStrip,
102         new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT));
103     a.recycle();
104 
105     // enable shadow casting from view bounds
106     setOutlineProvider(VIEW_BOUNDS_OUTLINE_PROVIDER);
107   }
108 
setViewPager(ViewPager viewPager)109   public void setViewPager(ViewPager viewPager) {
110     mPager = viewPager;
111     addTabs(mPager.getAdapter());
112   }
113 
114   /**
115    * Set the tab icons and initialize an array for unread counts the same length as the icon array.
116    *
117    * @param tabIcons An array representing the tab icons in order.
118    */
configureTabIcons(int[] tabIcons)119   public void configureTabIcons(int[] tabIcons) {
120     mTabIcons = tabIcons;
121     mUnreadCounts = new int[tabIcons.length];
122   }
123 
setUnreadCount(int count, int position)124   public void setUnreadCount(int count, int position) {
125     if (mUnreadCounts == null || position >= mUnreadCounts.length) {
126       return;
127     }
128     mUnreadCounts[position] = count;
129   }
130 
addTabs(PagerAdapter adapter)131   private void addTabs(PagerAdapter adapter) {
132     mTabStrip.removeAllViews();
133 
134     final int count = adapter.getCount();
135     for (int i = 0; i < count; i++) {
136       addTab(adapter.getPageTitle(i), i);
137     }
138   }
139 
addTab(CharSequence tabTitle, final int position)140   private void addTab(CharSequence tabTitle, final int position) {
141     View tabView;
142     if (mTabIcons != null && position < mTabIcons.length) {
143       View layout = LayoutInflater.from(getContext()).inflate(R.layout.unread_count_tab, null);
144       View iconView = layout.findViewById(R.id.icon);
145       iconView.setBackgroundResource(mTabIcons[position]);
146       iconView.setContentDescription(tabTitle);
147       TextView textView = (TextView) layout.findViewById(R.id.count);
148       if (mUnreadCounts != null && mUnreadCounts[position] > 0) {
149         textView.setText(Integer.toString(mUnreadCounts[position]));
150         textView.setVisibility(View.VISIBLE);
151         iconView.setContentDescription(
152             getResources()
153                 .getQuantityString(
154                     R.plurals.tab_title_with_unread_items,
155                     mUnreadCounts[position],
156                     tabTitle.toString(),
157                     mUnreadCounts[position]));
158       } else {
159         textView.setVisibility(View.INVISIBLE);
160         iconView.setContentDescription(getResources().getString(R.string.tab_title, tabTitle));
161       }
162       tabView = layout;
163     } else {
164       final TextView textView = new TextView(getContext());
165       textView.setText(tabTitle);
166       textView.setClickable(true);
167 
168       // Assign various text appearance related attributes to child views.
169       if (mTextStyle > 0) {
170         textView.setTypeface(textView.getTypeface(), mTextStyle);
171       }
172       if (mTextSize > 0) {
173         textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
174       }
175       if (mTextColor != null) {
176         textView.setTextColor(mTextColor);
177       }
178       textView.setAllCaps(mTextAllCaps);
179       textView.setGravity(Gravity.CENTER);
180 
181       tabView = textView;
182     }
183 
184     tabView.setOnClickListener(
185         new OnClickListener() {
186           @Override
187           public void onClick(View v) {
188             mPager.setCurrentItem(getRtlPosition(position));
189           }
190         });
191 
192     tabView.setOnLongClickListener(new OnTabLongClickListener(position));
193 
194     tabView.setPadding(mSidePadding, 0, mSidePadding, 0);
195 
196     mTabStrip.addView(
197         tabView,
198         position,
199         new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT, 1));
200 
201     // Default to the first child being selected
202     if (position == 0) {
203       mPrevSelected = 0;
204       tabView.setSelected(true);
205     }
206   }
207 
208   /**
209    * Remove a tab at a certain index.
210    *
211    * @param index The index of the tab view we wish to remove.
212    */
removeTab(int index)213   public void removeTab(int index) {
214     View view = mTabStrip.getChildAt(index);
215     if (view != null) {
216       mTabStrip.removeView(view);
217     }
218   }
219 
220   /**
221    * Refresh a tab at a certain index by removing it and reconstructing it.
222    *
223    * @param index The index of the tab view we wish to update.
224    */
updateTab(int index)225   public void updateTab(int index) {
226     removeTab(index);
227 
228     if (index < mPager.getAdapter().getCount()) {
229       addTab(mPager.getAdapter().getPageTitle(index), index);
230     }
231   }
232 
233   @Override
onPageScrolled(int position, float positionOffset, int positionOffsetPixels)234   public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
235     position = getRtlPosition(position);
236     int tabStripChildCount = mTabStrip.getChildCount();
237     if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
238       return;
239     }
240 
241     mTabStrip.onPageScrolled(position, positionOffset, positionOffsetPixels);
242   }
243 
244   @Override
onPageSelected(int position)245   public void onPageSelected(int position) {
246     position = getRtlPosition(position);
247     int tabStripChildCount = mTabStrip.getChildCount();
248     if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
249       return;
250     }
251 
252     if (mPrevSelected >= 0 && mPrevSelected < tabStripChildCount) {
253       mTabStrip.getChildAt(mPrevSelected).setSelected(false);
254     }
255     final View selectedChild = mTabStrip.getChildAt(position);
256     selectedChild.setSelected(true);
257 
258     // Update scroll position
259     final int scrollPos = selectedChild.getLeft() - (getWidth() - selectedChild.getWidth()) / 2;
260     smoothScrollTo(scrollPos, 0);
261     mPrevSelected = position;
262   }
263 
264   @Override
onPageScrollStateChanged(int state)265   public void onPageScrollStateChanged(int state) {}
266 
getRtlPosition(int position)267   private int getRtlPosition(int position) {
268     if (getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
269       return mTabStrip.getChildCount() - 1 - position;
270     }
271     return position;
272   }
273 
274   /** Simulates actionbar tab behavior by showing a toast with the tab title when long clicked. */
275   private class OnTabLongClickListener implements OnLongClickListener {
276 
277     final int mPosition;
278 
OnTabLongClickListener(int position)279     public OnTabLongClickListener(int position) {
280       mPosition = position;
281     }
282 
283     @Override
onLongClick(View v)284     public boolean onLongClick(View v) {
285       final int[] screenPos = new int[2];
286       getLocationOnScreen(screenPos);
287 
288       final Context context = getContext();
289       final int width = getWidth();
290       final int height = getHeight();
291       final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
292 
293       Toast toast =
294           Toast.makeText(context, mPager.getAdapter().getPageTitle(mPosition), Toast.LENGTH_SHORT);
295 
296       // Show the toast under the tab
297       toast.setGravity(
298           Gravity.TOP | Gravity.CENTER_HORIZONTAL,
299           (screenPos[0] + width / 2) - screenWidth / 2,
300           screenPos[1] + height);
301 
302       toast.show();
303       return true;
304     }
305   }
306 }
307