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      1 /*
      2  * Copyright (C) 2015 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.messaging.ui;
     17 
     18 import android.content.Context;
     19 import android.support.v4.view.PagerAdapter;
     20 import android.support.v4.view.ViewPager;
     21 import android.support.v4.view.ViewPager.OnPageChangeListener;
     22 import android.util.AttributeSet;
     23 import android.util.TypedValue;
     24 import android.view.LayoutInflater;
     25 import android.widget.LinearLayout;
     26 
     27 import com.android.messaging.R;
     28 import com.android.messaging.util.Assert;
     29 
     30 /**
     31  * A view that contains both a view pager and a tab strip wrapped in a linear layout.
     32  */
     33 public class CustomHeaderViewPager extends LinearLayout {
     34     public final static int DEFAULT_TAB_STRIP_SIZE = -1;
     35     private final int mDefaultTabStripSize;
     36     private ViewPager mViewPager;
     37     private ViewPagerTabs mTabstrip;
     38 
     39     public CustomHeaderViewPager(final Context context, final AttributeSet attrs) {
     40         super(context, attrs);
     41 
     42         final LayoutInflater inflater = LayoutInflater.from(context);
     43         inflater.inflate(R.layout.custom_header_view_pager, this, true);
     44         setOrientation(LinearLayout.VERTICAL);
     45 
     46         mTabstrip = (ViewPagerTabs) findViewById(R.id.tab_strip);
     47         mViewPager = (ViewPager) findViewById(R.id.pager);
     48 
     49         TypedValue tv = new TypedValue();
     50         context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
     51         mDefaultTabStripSize = context.getResources().getDimensionPixelSize(tv.resourceId);
     52     }
     53 
     54     public void setCurrentItem(final int position) {
     55         mViewPager.setCurrentItem(position);
     56     }
     57 
     58     public void setViewPagerTabHeight(final int tabHeight) {
     59         mTabstrip.getLayoutParams().height = tabHeight == DEFAULT_TAB_STRIP_SIZE ?
     60                 mDefaultTabStripSize : tabHeight;
     61     }
     62 
     63     public void setViewHolders(final CustomHeaderPagerViewHolder[] viewHolders) {
     64         Assert.notNull(mViewPager);
     65         final PagerAdapter adapter = new CustomHeaderViewPagerAdapter(viewHolders);
     66         mViewPager.setAdapter(adapter);
     67         mTabstrip.setViewPager(mViewPager);
     68         mViewPager.setOnPageChangeListener(new OnPageChangeListener() {
     69 
     70             @Override
     71             public void onPageScrollStateChanged(int state) {
     72                 mTabstrip.onPageScrollStateChanged(state);
     73             }
     74 
     75             @Override
     76             public void onPageScrolled(int position, float positionOffset,
     77                     int positionOffsetPixels) {
     78                 mTabstrip.onPageScrolled(position, positionOffset, positionOffsetPixels);
     79             }
     80 
     81             @Override
     82             public void onPageSelected(int position) {
     83                 mTabstrip.onPageSelected(position);
     84             }
     85         });
     86     }
     87 
     88     public int getSelectedItemPosition() {
     89         return mTabstrip.getSelectedItemPosition();
     90     }
     91 }
     92