java/com/android/contacts/common/list/ViewPagerTabs.java - platform/packages/apps/Dialer - Gitiles

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package com.android.contacts.common.list;

 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.content.res.TypedArray;
 import android.graphics.Outline;
 import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.util.AttributeSet;
 import android.util.TypedValue;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewOutlineProvider;
 import android.widget.FrameLayout;
 import android.widget.HorizontalScrollView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 import com.android.contacts.common.R;
 import com.android.dialer.compat.CompatUtils;

 /**
  * Lightweight implementation of ViewPager tabs. This looks similar to traditional actionBar tabs,
  * but allows for the view containing the tabs to be placed anywhere on screen. Text-related
  * attributes can also be assigned in XML - these will get propogated to the child TextViews
  * automatically.
  */
 public class ViewPagerTabs extends HorizontalScrollView implements ViewPager.OnPageChangeListener {

   private static final ViewOutlineProvider VIEW_BOUNDS_OUTLINE_PROVIDER;
   private static final int TAB_SIDE_PADDING_IN_DPS = 10;
   // TODO: This should use <declare-styleable> in the future
   private static final int[] ATTRS =
       new int[] {
         android.R.attr.textSize,
         android.R.attr.textStyle,
         android.R.attr.textColor,
         android.R.attr.textAllCaps
       };

   static {
     if (CompatUtils.isLollipopCompatible()) {
       VIEW_BOUNDS_OUTLINE_PROVIDER =
           new ViewOutlineProvider() {
             @Override
             public void getOutline(View view, Outline outline) {
               outline.setRect(0, 0, view.getWidth(), view.getHeight());
             }
           };
     } else {
       VIEW_BOUNDS_OUTLINE_PROVIDER = null;
     }
   }

   /**
    * Linearlayout that will contain the TextViews serving as tabs. This is the only child of the
    * parent HorizontalScrollView.
    */
   final int mTextStyle;

   final ColorStateList mTextColor;
   final int mTextSize;
   final boolean mTextAllCaps;
   ViewPager mPager;
   int mPrevSelected = -1;
   int mSidePadding;
   private ViewPagerTabStrip mTabStrip;
   private int[] mTabIcons;
   // For displaying the unread count next to the tab icon.
   private int[] mUnreadCounts;

   public ViewPagerTabs(Context context) {
     this(context, null);
   }

   public ViewPagerTabs(Context context, AttributeSet attrs) {
     this(context, attrs, 0);
   }

   public ViewPagerTabs(Context context, AttributeSet attrs, int defStyle) {
     super(context, attrs, defStyle);
     setFillViewport(true);

     mSidePadding = (int) (getResources().getDisplayMetrics().density * TAB_SIDE_PADDING_IN_DPS);

     final TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);
     mTextSize = a.getDimensionPixelSize(0, 0);
     mTextStyle = a.getInt(1, 0);
     mTextColor = a.getColorStateList(2);
     mTextAllCaps = a.getBoolean(3, false);

     mTabStrip = new ViewPagerTabStrip(context);
     addView(
         mTabStrip,
         new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT));
     a.recycle();

     if (CompatUtils.isLollipopCompatible()) {
       // enable shadow casting from view bounds
       setOutlineProvider(VIEW_BOUNDS_OUTLINE_PROVIDER);
     }
   }

   public void setViewPager(ViewPager viewPager) {
     mPager = viewPager;
     addTabs(mPager.getAdapter());
   }

   /**
    * Set the tab icons and initialize an array for unread counts the same length as the icon array.
    *
    * @param tabIcons An array representing the tab icons in order.
    */
   public void configureTabIcons(int[] tabIcons) {
     mTabIcons = tabIcons;
     mUnreadCounts = new int[tabIcons.length];
   }

   public void setUnreadCount(int count, int position) {
     if (mUnreadCounts == null || position >= mUnreadCounts.length) {
       return;
     }
     mUnreadCounts[position] = count;
   }

   private void addTabs(PagerAdapter adapter) {
     mTabStrip.removeAllViews();

     final int count = adapter.getCount();
     for (int i = 0; i < count; i++) {
       addTab(adapter.getPageTitle(i), i);
     }
   }

   private void addTab(CharSequence tabTitle, final int position) {
     View tabView;
     if (mTabIcons != null && position < mTabIcons.length) {
       View layout = LayoutInflater.from(getContext()).inflate(R.layout.unread_count_tab, null);
       View iconView = layout.findViewById(R.id.icon);
       iconView.setBackgroundResource(mTabIcons[position]);
       iconView.setContentDescription(tabTitle);
       TextView textView = (TextView) layout.findViewById(R.id.count);
       if (mUnreadCounts != null && mUnreadCounts[position] > 0) {
         textView.setText(Integer.toString(mUnreadCounts[position]));
         textView.setVisibility(View.VISIBLE);
         iconView.setContentDescription(
             getResources()
                 .getQuantityString(
                     R.plurals.tab_title_with_unread_items,
                     mUnreadCounts[position],
                     tabTitle.toString(),
                     mUnreadCounts[position]));
       } else {
         textView.setVisibility(View.INVISIBLE);
         iconView.setContentDescription(getResources().getString(R.string.tab_title, tabTitle));
       }
       tabView = layout;
     } else {
       final TextView textView = new TextView(getContext());
       textView.setText(tabTitle);
       textView.setBackgroundResource(R.drawable.view_pager_tab_background);

       // Assign various text appearance related attributes to child views.
       if (mTextStyle > 0) {
         textView.setTypeface(textView.getTypeface(), mTextStyle);
       }
       if (mTextSize > 0) {
         textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
       }
       if (mTextColor != null) {
         textView.setTextColor(mTextColor);
       }
       textView.setAllCaps(mTextAllCaps);
       textView.setGravity(Gravity.CENTER);

       tabView = textView;
     }

     tabView.setOnClickListener(
         new OnClickListener() {
           @Override
           public void onClick(View v) {
             mPager.setCurrentItem(getRtlPosition(position));
           }
         });

     tabView.setOnLongClickListener(new OnTabLongClickListener(position));

     tabView.setPadding(mSidePadding, 0, mSidePadding, 0);

     mTabStrip.addView(
         tabView,
         position,
         new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT, 1));

     // Default to the first child being selected
     if (position == 0) {
       mPrevSelected = 0;
       tabView.setSelected(true);
     }
   }

   /**
    * Remove a tab at a certain index.
    *
    * @param index The index of the tab view we wish to remove.
    */
   public void removeTab(int index) {
     View view = mTabStrip.getChildAt(index);
     if (view != null) {
       mTabStrip.removeView(view);
     }
   }

   /**
    * Refresh a tab at a certain index by removing it and reconstructing it.
    *
    * @param index The index of the tab view we wish to update.
    */
   public void updateTab(int index) {
     removeTab(index);

     if (index < mPager.getAdapter().getCount()) {
       addTab(mPager.getAdapter().getPageTitle(index), index);
     }
   }

   @Override
   public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
     position = getRtlPosition(position);
     int tabStripChildCount = mTabStrip.getChildCount();
     if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
       return;
     }

     mTabStrip.onPageScrolled(position, positionOffset, positionOffsetPixels);
   }

   @Override
   public void onPageSelected(int position) {
     position = getRtlPosition(position);
     int tabStripChildCount = mTabStrip.getChildCount();
     if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
       return;
     }

     if (mPrevSelected >= 0 && mPrevSelected < tabStripChildCount) {
       mTabStrip.getChildAt(mPrevSelected).setSelected(false);
     }
     final View selectedChild = mTabStrip.getChildAt(position);
     selectedChild.setSelected(true);

     // Update scroll position
     final int scrollPos = selectedChild.getLeft() - (getWidth() - selectedChild.getWidth()) / 2;
     smoothScrollTo(scrollPos, 0);
     mPrevSelected = position;
   }

   @Override
   public void onPageScrollStateChanged(int state) {}

   private int getRtlPosition(int position) {
     if (getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
       return mTabStrip.getChildCount() - 1 - position;
     }
     return position;
   }

   /** Simulates actionbar tab behavior by showing a toast with the tab title when long clicked. */
   private class OnTabLongClickListener implements OnLongClickListener {

     final int mPosition;

     public OnTabLongClickListener(int position) {
       mPosition = position;
     }

     @Override
     public boolean onLongClick(View v) {
       final int[] screenPos = new int[2];
       getLocationOnScreen(screenPos);

       final Context context = getContext();
       final int width = getWidth();
       final int height = getHeight();
       final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;

       Toast toast =
           Toast.makeText(context, mPager.getAdapter().getPageTitle(mPosition), Toast.LENGTH_SHORT);

       // Show the toast under the tab
       toast.setGravity(
           Gravity.TOP | Gravity.CENTER_HORIZONTAL,
           (screenPos[0] + width / 2) - screenWidth / 2,
           screenPos[1] + height);

       toast.show();
       return true;
     }
   }
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package com.android.contacts.common.list;

	import android.content.Context;
	import android.content.res.ColorStateList;
	import android.content.res.TypedArray;
	import android.graphics.Outline;
	import android.support.v4.view.PagerAdapter;
	import android.support.v4.view.ViewPager;
	import android.util.AttributeSet;
	import android.util.TypedValue;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewOutlineProvider;
	import android.widget.FrameLayout;
	import android.widget.HorizontalScrollView;
	import android.widget.LinearLayout;
	import android.widget.TextView;
	import android.widget.Toast;
	import com.android.contacts.common.R;
	import com.android.dialer.compat.CompatUtils;

	/**
	* Lightweight implementation of ViewPager tabs. This looks similar to traditional actionBar tabs,
	* but allows for the view containing the tabs to be placed anywhere on screen. Text-related
	* attributes can also be assigned in XML - these will get propogated to the child TextViews
	* automatically.
	*/
	public class ViewPagerTabs extends HorizontalScrollView implements ViewPager.OnPageChangeListener {

	private static final ViewOutlineProvider VIEW_BOUNDS_OUTLINE_PROVIDER;
	private static final int TAB_SIDE_PADDING_IN_DPS = 10;
	// TODO: This should use <declare-styleable> in the future
	private static final int[] ATTRS =
	new int[] {
	android.R.attr.textSize,
	android.R.attr.textStyle,
	android.R.attr.textColor,
	android.R.attr.textAllCaps
	};

	static {
	if (CompatUtils.isLollipopCompatible()) {
	VIEW_BOUNDS_OUTLINE_PROVIDER =
	new ViewOutlineProvider() {
	@Override
	public void getOutline(View view, Outline outline) {
	outline.setRect(0, 0, view.getWidth(), view.getHeight());
	}
	};
	} else {
	VIEW_BOUNDS_OUTLINE_PROVIDER = null;
	}
	}

	/**
	* Linearlayout that will contain the TextViews serving as tabs. This is the only child of the
	* parent HorizontalScrollView.
	*/
	final int mTextStyle;

	final ColorStateList mTextColor;
	final int mTextSize;
	final boolean mTextAllCaps;
	ViewPager mPager;
	int mPrevSelected = -1;
	int mSidePadding;
	private ViewPagerTabStrip mTabStrip;
	private int[] mTabIcons;
	// For displaying the unread count next to the tab icon.
	private int[] mUnreadCounts;

	public ViewPagerTabs(Context context) {
	this(context, null);
	}

	public ViewPagerTabs(Context context, AttributeSet attrs) {
	this(context, attrs, 0);
	}

	public ViewPagerTabs(Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);
	setFillViewport(true);

	mSidePadding = (int) (getResources().getDisplayMetrics().density * TAB_SIDE_PADDING_IN_DPS);

	final TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);
	mTextSize = a.getDimensionPixelSize(0, 0);
	mTextStyle = a.getInt(1, 0);
	mTextColor = a.getColorStateList(2);
	mTextAllCaps = a.getBoolean(3, false);

	mTabStrip = new ViewPagerTabStrip(context);
	addView(
	mTabStrip,
	new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT));
	a.recycle();

	if (CompatUtils.isLollipopCompatible()) {
	// enable shadow casting from view bounds
	setOutlineProvider(VIEW_BOUNDS_OUTLINE_PROVIDER);
	}
	}

	public void setViewPager(ViewPager viewPager) {
	mPager = viewPager;
	addTabs(mPager.getAdapter());
	}

	/**
	* Set the tab icons and initialize an array for unread counts the same length as the icon array.
	*
	* @param tabIcons An array representing the tab icons in order.
	*/
	public void configureTabIcons(int[] tabIcons) {
	mTabIcons = tabIcons;
	mUnreadCounts = new int[tabIcons.length];
	}

	public void setUnreadCount(int count, int position) {
	if (mUnreadCounts == null \|\| position >= mUnreadCounts.length) {
	return;
	}
	mUnreadCounts[position] = count;
	}

	private void addTabs(PagerAdapter adapter) {
	mTabStrip.removeAllViews();

	final int count = adapter.getCount();
	for (int i = 0; i < count; i++) {
	addTab(adapter.getPageTitle(i), i);
	}
	}

	private void addTab(CharSequence tabTitle, final int position) {
	View tabView;
	if (mTabIcons != null && position < mTabIcons.length) {
	View layout = LayoutInflater.from(getContext()).inflate(R.layout.unread_count_tab, null);
	View iconView = layout.findViewById(R.id.icon);
	iconView.setBackgroundResource(mTabIcons[position]);
	iconView.setContentDescription(tabTitle);
	TextView textView = (TextView) layout.findViewById(R.id.count);
	if (mUnreadCounts != null && mUnreadCounts[position] > 0) {
	textView.setText(Integer.toString(mUnreadCounts[position]));
	textView.setVisibility(View.VISIBLE);
	iconView.setContentDescription(
	getResources()
	.getQuantityString(
	R.plurals.tab_title_with_unread_items,
	mUnreadCounts[position],
	tabTitle.toString(),
	mUnreadCounts[position]));
	} else {
	textView.setVisibility(View.INVISIBLE);
	iconView.setContentDescription(getResources().getString(R.string.tab_title, tabTitle));
	}
	tabView = layout;
	} else {
	final TextView textView = new TextView(getContext());
	textView.setText(tabTitle);
	textView.setBackgroundResource(R.drawable.view_pager_tab_background);

	// Assign various text appearance related attributes to child views.
	if (mTextStyle > 0) {
	textView.setTypeface(textView.getTypeface(), mTextStyle);
	}
	if (mTextSize > 0) {
	textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
	}
	if (mTextColor != null) {
	textView.setTextColor(mTextColor);
	}
	textView.setAllCaps(mTextAllCaps);
	textView.setGravity(Gravity.CENTER);

	tabView = textView;
	}

	tabView.setOnClickListener(
	new OnClickListener() {
	@Override
	public void onClick(View v) {
	mPager.setCurrentItem(getRtlPosition(position));
	}
	});

	tabView.setOnLongClickListener(new OnTabLongClickListener(position));

	tabView.setPadding(mSidePadding, 0, mSidePadding, 0);

	mTabStrip.addView(
	tabView,
	position,
	new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT, 1));

	// Default to the first child being selected
	if (position == 0) {
	mPrevSelected = 0;
	tabView.setSelected(true);
	}
	}

	/**
	* Remove a tab at a certain index.
	*
	* @param index The index of the tab view we wish to remove.
	*/
	public void removeTab(int index) {
	View view = mTabStrip.getChildAt(index);
	if (view != null) {
	mTabStrip.removeView(view);
	}
	}

	/**
	* Refresh a tab at a certain index by removing it and reconstructing it.
	*
	* @param index The index of the tab view we wish to update.
	*/
	public void updateTab(int index) {
	removeTab(index);

	if (index < mPager.getAdapter().getCount()) {
	addTab(mPager.getAdapter().getPageTitle(index), index);
	}
	}

	@Override
	public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
	position = getRtlPosition(position);
	int tabStripChildCount = mTabStrip.getChildCount();
	if ((tabStripChildCount == 0) \|\| (position < 0) \|\| (position >= tabStripChildCount)) {
	return;
	}

	mTabStrip.onPageScrolled(position, positionOffset, positionOffsetPixels);
	}

	@Override
	public void onPageSelected(int position) {
	position = getRtlPosition(position);
	int tabStripChildCount = mTabStrip.getChildCount();
	if ((tabStripChildCount == 0) \|\| (position < 0) \|\| (position >= tabStripChildCount)) {
	return;
	}

	if (mPrevSelected >= 0 && mPrevSelected < tabStripChildCount) {
	mTabStrip.getChildAt(mPrevSelected).setSelected(false);
	}
	final View selectedChild = mTabStrip.getChildAt(position);
	selectedChild.setSelected(true);

	// Update scroll position
	final int scrollPos = selectedChild.getLeft() - (getWidth() - selectedChild.getWidth()) / 2;
	smoothScrollTo(scrollPos, 0);
	mPrevSelected = position;
	}

	@Override
	public void onPageScrollStateChanged(int state) {}

	private int getRtlPosition(int position) {
	if (getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
	return mTabStrip.getChildCount() - 1 - position;
	}
	return position;
	}

	/** Simulates actionbar tab behavior by showing a toast with the tab title when long clicked. */
	private class OnTabLongClickListener implements OnLongClickListener {

	final int mPosition;

	public OnTabLongClickListener(int position) {
	mPosition = position;
	}

	@Override
	public boolean onLongClick(View v) {
	final int[] screenPos = new int[2];
	getLocationOnScreen(screenPos);

	final Context context = getContext();
	final int width = getWidth();
	final int height = getHeight();
	final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;

	Toast toast =
	Toast.makeText(context, mPager.getAdapter().getPageTitle(mPosition), Toast.LENGTH_SHORT);

	// Show the toast under the tab
	toast.setGravity(
	Gravity.TOP \| Gravity.CENTER_HORIZONTAL,
	(screenPos[0] + width / 2) - screenWidth / 2,
	screenPos[1] + height);

	toast.show();
	return true;
	}
	}
	}