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 36 import com.android.contacts.common.R; 37 import com.android.contacts.common.compat.CompatUtils; 38 39 /** 40 * Lightweight implementation of ViewPager tabs. This looks similar to traditional actionBar tabs, 41 * but allows for the view containing the tabs to be placed anywhere on screen. Text-related 42 * attributes can also be assigned in XML - these will get propogated to the child TextViews 43 * automatically. 44 */ 45 public class ViewPagerTabs extends HorizontalScrollView implements ViewPager.OnPageChangeListener { 46 47 ViewPager mPager; 48 private ViewPagerTabStrip mTabStrip; 49 50 /** 51 * Linearlayout that will contain the TextViews serving as tabs. This is the only child 52 * of the parent HorizontalScrollView. 53 */ 54 final int mTextStyle; 55 final ColorStateList mTextColor; 56 final int mTextSize; 57 final boolean mTextAllCaps; 58 int mPrevSelected = -1; 59 int mSidePadding; 60 61 private int[] mTabIcons; 62 // For displaying the unread count next to the tab icon. 63 private int[] mUnreadCounts; 64 65 private static final ViewOutlineProvider VIEW_BOUNDS_OUTLINE_PROVIDER; 66 static { 67 if (CompatUtils.isLollipopCompatible()) { 68 VIEW_BOUNDS_OUTLINE_PROVIDER = new ViewOutlineProvider() { 69 @Override 70 public void getOutline(View view, Outline outline) { 71 outline.setRect(0, 0, view.getWidth(), view.getHeight()); 72 } 73 }; 74 } else { 75 VIEW_BOUNDS_OUTLINE_PROVIDER = null; 76 } 77 } 78 79 private static final int TAB_SIDE_PADDING_IN_DPS = 10; 80 81 // TODO: This should use <declare-styleable> in the future 82 private static final int[] ATTRS = new int[] { 83 android.R.attr.textSize, 84 android.R.attr.textStyle, 85 android.R.attr.textColor, 86 android.R.attr.textAllCaps 87 }; 88 89 /** 90 * Simulates actionbar tab behavior by showing a toast with the tab title when long clicked. 91 */ 92 private class OnTabLongClickListener implements OnLongClickListener { 93 final int mPosition; 94 OnTabLongClickListener(int position)95 public OnTabLongClickListener(int position) { 96 mPosition = position; 97 } 98 99 @Override onLongClick(View v)100 public boolean onLongClick(View v) { 101 final int[] screenPos = new int[2]; 102 getLocationOnScreen(screenPos); 103 104 final Context context = getContext(); 105 final int width = getWidth(); 106 final int height = getHeight(); 107 final int screenWidth = context.getResources().getDisplayMetrics().widthPixels; 108 109 Toast toast = Toast.makeText(context, mPager.getAdapter().getPageTitle(mPosition), 110 Toast.LENGTH_SHORT); 111 112 // Show the toast under the tab 113 toast.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, 114 (screenPos[0] + width / 2) - screenWidth / 2, screenPos[1] + height); 115 116 toast.show(); 117 return true; 118 } 119 } 120 ViewPagerTabs(Context context)121 public ViewPagerTabs(Context context) { 122 this(context, null); 123 } 124 ViewPagerTabs(Context context, AttributeSet attrs)125 public ViewPagerTabs(Context context, AttributeSet attrs) { 126 this(context, attrs, 0); 127 } 128 ViewPagerTabs(Context context, AttributeSet attrs, int defStyle)129 public ViewPagerTabs(Context context, AttributeSet attrs, int defStyle) { 130 super(context, attrs, defStyle); 131 setFillViewport(true); 132 133 mSidePadding = (int) (getResources().getDisplayMetrics().density * TAB_SIDE_PADDING_IN_DPS); 134 135 final TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); 136 mTextSize = a.getDimensionPixelSize(0, 0); 137 mTextStyle = a.getInt(1, 0); 138 mTextColor = a.getColorStateList(2); 139 mTextAllCaps = a.getBoolean(3, false); 140 141 mTabStrip = new ViewPagerTabStrip(context); 142 addView(mTabStrip, 143 new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT)); 144 a.recycle(); 145 146 if (CompatUtils.isLollipopCompatible()) { 147 // enable shadow casting from view bounds 148 setOutlineProvider(VIEW_BOUNDS_OUTLINE_PROVIDER); 149 } 150 } 151 setViewPager(ViewPager viewPager)152 public void setViewPager(ViewPager viewPager) { 153 mPager = viewPager; 154 addTabs(mPager.getAdapter()); 155 } 156 157 /** 158 * Set the tab icons and initialize an array for unread counts the same length as the icon 159 * array. 160 * 161 * @param tabIcons An array representing the tab icons in order. 162 */ configureTabIcons(int[] tabIcons)163 public void configureTabIcons(int[] tabIcons) { 164 mTabIcons = tabIcons; 165 mUnreadCounts = new int[tabIcons.length]; 166 } 167 setUnreadCount(int count, int position)168 public void setUnreadCount(int count, int position) { 169 if (mUnreadCounts == null || position >= mUnreadCounts.length) { 170 return; 171 } 172 mUnreadCounts[position] = count; 173 } 174 addTabs(PagerAdapter adapter)175 private void addTabs(PagerAdapter adapter) { 176 mTabStrip.removeAllViews(); 177 178 final int count = adapter.getCount(); 179 for (int i = 0; i < count; i++) { 180 addTab(adapter.getPageTitle(i), i); 181 } 182 } 183 addTab(CharSequence tabTitle, final int position)184 private void addTab(CharSequence tabTitle, final int position) { 185 View tabView; 186 if (mTabIcons != null && position < mTabIcons.length) { 187 View layout = LayoutInflater.from(getContext()).inflate( 188 R.layout.unread_count_tab, null); 189 View iconView = layout.findViewById(R.id.icon); 190 iconView.setBackgroundResource(mTabIcons[position]); 191 iconView.setContentDescription(tabTitle); 192 TextView textView = (TextView) layout.findViewById(R.id.count); 193 if (mUnreadCounts != null && mUnreadCounts[position] > 0) { 194 textView.setText(Integer.toString(mUnreadCounts[position])); 195 textView.setVisibility(View.VISIBLE); 196 iconView.setContentDescription(getResources().getQuantityString( 197 R.plurals.tab_title_with_unread_items, 198 mUnreadCounts[position], 199 tabTitle.toString(), 200 mUnreadCounts[position])); 201 } else { 202 textView.setVisibility(View.INVISIBLE); 203 iconView.setContentDescription(tabTitle); 204 } 205 tabView = layout; 206 } else { 207 final TextView textView = new TextView(getContext()); 208 textView.setText(tabTitle); 209 textView.setBackgroundResource(R.drawable.view_pager_tab_background); 210 211 // Assign various text appearance related attributes to child views. 212 if (mTextStyle > 0) { 213 textView.setTypeface(textView.getTypeface(), mTextStyle); 214 } 215 if (mTextSize > 0) { 216 textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize); 217 } 218 if (mTextColor != null) { 219 textView.setTextColor(mTextColor); 220 } 221 textView.setAllCaps(mTextAllCaps); 222 textView.setGravity(Gravity.CENTER); 223 224 tabView = textView; 225 } 226 227 tabView.setOnClickListener(new OnClickListener() { 228 @Override 229 public void onClick(View v) { 230 mPager.setCurrentItem(getRtlPosition(position)); 231 } 232 }); 233 234 tabView.setOnLongClickListener(new OnTabLongClickListener(position)); 235 236 tabView.setPadding(mSidePadding, 0, mSidePadding, 0); 237 238 mTabStrip.addView(tabView, position, new LinearLayout.LayoutParams( 239 LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT, 1)); 240 241 // Default to the first child being selected 242 if (position == 0) { 243 mPrevSelected = 0; 244 tabView.setSelected(true); 245 } 246 } 247 248 /** 249 * Remove a tab at a certain index. 250 * 251 * @param index The index of the tab view we wish to remove. 252 */ removeTab(int index)253 public void removeTab(int index) { 254 View view = mTabStrip.getChildAt(index); 255 if (view != null) { 256 mTabStrip.removeView(view); 257 } 258 } 259 260 /** 261 * Refresh a tab at a certain index by removing it and reconstructing it. 262 * 263 * @param index The index of the tab view we wish to update. 264 */ updateTab(int index)265 public void updateTab(int index) { 266 removeTab(index); 267 268 if (index < mPager.getAdapter().getCount()) { 269 addTab(mPager.getAdapter().getPageTitle(index), index); 270 } 271 } 272 273 @Override onPageScrolled(int position, float positionOffset, int positionOffsetPixels)274 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 275 position = getRtlPosition(position); 276 int tabStripChildCount = mTabStrip.getChildCount(); 277 if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) { 278 return; 279 } 280 281 mTabStrip.onPageScrolled(position, positionOffset, positionOffsetPixels); 282 } 283 284 @Override onPageSelected(int position)285 public void onPageSelected(int position) { 286 position = getRtlPosition(position); 287 int tabStripChildCount = mTabStrip.getChildCount(); 288 if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) { 289 return; 290 } 291 292 if (mPrevSelected >= 0 && mPrevSelected < tabStripChildCount) { 293 mTabStrip.getChildAt(mPrevSelected).setSelected(false); 294 } 295 final View selectedChild = mTabStrip.getChildAt(position); 296 selectedChild.setSelected(true); 297 298 // Update scroll position 299 final int scrollPos = selectedChild.getLeft() - (getWidth() - selectedChild.getWidth()) / 2; 300 smoothScrollTo(scrollPos, 0); 301 mPrevSelected = position; 302 } 303 304 @Override onPageScrollStateChanged(int state)305 public void onPageScrollStateChanged(int state) { 306 } 307 getRtlPosition(int position)308 private int getRtlPosition(int position) { 309 if (getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) { 310 return mTabStrip.getChildCount() - 1 - position; 311 } 312 return position; 313 } 314 } 315 316