Android Open Source - vanilindy Tab Page Indicator

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Back to project page vanilindy.

License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2011 The Android Open Source Project
 * Copyright (C) 2011 Jake Wharton/*from  w  ww  .  jav  a 2  s. com*/
 *
 * 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.viewpagerindicator;

import android.content.Context;
import android.graphics.Typeface;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;
import ch.blinkenlights.android.vanilla.R;

/**
 * This widget implements the dynamic action bar tab behavior that can change
 * across different configurations or circumstances.
 */
public class TabPageIndicator extends HorizontalScrollView
  implements ViewPager.OnPageChangeListener
           , View.OnClickListener
{
  Runnable mTabSelector;

  private final LinearLayout mTabLayout;
  private ViewPager mViewPager;
  private ViewPager.OnPageChangeListener mListener;

  private int mSelectedTabIndex;

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

  public TabPageIndicator(Context context, AttributeSet attrs) {
    super(context, attrs);
    setHorizontalScrollBarEnabled(false);

    mTabLayout = new LinearLayout(getContext());
    addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT));
  }

  @Override
  public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
    final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
    setFillViewport(lockedExpanded);

    final int oldWidth = getMeasuredWidth();
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    final int newWidth = getMeasuredWidth();

    if (lockedExpanded && oldWidth != newWidth) {
      // Recenter the tab display if we're at a new (scrollable) size.
      setCurrentItem(mSelectedTabIndex);
    }
  }

  private void animateToTab(final int position) {
    final View tabView = mTabLayout.getChildAt(position);
    if (mTabSelector != null) {
      removeCallbacks(mTabSelector);
    }
    mTabSelector = new Runnable() {
      @Override
      public void run() {
        final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2;
        smoothScrollTo(scrollPos, 0);
        mTabSelector = null;
      }
    };
    post(mTabSelector);
  }

  @Override
  public void onAttachedToWindow() {
    super.onAttachedToWindow();
    if (mTabSelector != null) {
      // Re-post the selector we saved
      post(mTabSelector);
    }
  }

  @Override
  public void onDetachedFromWindow() {
    super.onDetachedFromWindow();
    if (mTabSelector != null) {
      removeCallbacks(mTabSelector);
    }
  }

  private void addTab(CharSequence text, int index) {
    Context context = getContext();
    DisplayMetrics dm = context.getResources().getDisplayMetrics();

    int padX = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 22, dm);
    int padY = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 12, dm);

    TextView tabView = new TextView(context);
    tabView.setBackgroundResource(R.drawable.vpi__tab_indicator);
    tabView.setPadding(padX, padY, padX, padY);
    tabView.setGravity(Gravity.CENTER);
    tabView.setTextColor(0xfff3f3f3);
    tabView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12);
    tabView.setTypeface(tabView.getTypeface(), Typeface.BOLD);
    tabView.setSingleLine();
    tabView.setTag(index);
    tabView.setFocusable(true);
    tabView.setOnClickListener(this);
    tabView.setText(text);

    mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1));
  }

  @Override
  public void onPageScrollStateChanged(int arg0) {
    if (mListener != null) {
      mListener.onPageScrollStateChanged(arg0);
    }
  }

  @Override
  public void onPageScrolled(int arg0, float arg1, int arg2) {
    if (mListener != null) {
      mListener.onPageScrolled(arg0, arg1, arg2);
    }
  }

  @Override
  public void onPageSelected(int arg0) {
    setCurrentItem(arg0);
    if (mListener != null) {
      mListener.onPageSelected(arg0);
    }
  }

  public void setViewPager(ViewPager view) {
    final PagerAdapter adapter = view.getAdapter();
    if (adapter == null) {
      throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    view.setOnPageChangeListener(this);
    notifyDataSetChanged();
  }

  public void notifyDataSetChanged() {
    mTabLayout.removeAllViews();
    PagerAdapter adapter = mViewPager.getAdapter();
    final int count = adapter.getCount();
    for (int i = 0; i < count; i++) {
      addTab(adapter.getPageTitle(i), i);
    }
    if (mSelectedTabIndex > count) {
      mSelectedTabIndex = count - 1;
    }
    setCurrentItem(mSelectedTabIndex);
    requestLayout();
  }

  public void setCurrentItem(int item) {
    if (mViewPager == null) {
      throw new IllegalStateException("ViewPager has not been bound.");
    }
    mSelectedTabIndex = item;
    final int tabCount = mTabLayout.getChildCount();
    for (int i = 0; i < tabCount; i++) {
      final View child = mTabLayout.getChildAt(i);
      final boolean isSelected = i == item;
      child.setSelected(isSelected);
      if (isSelected) {
        animateToTab(item);
      }
    }
  }

  public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
    mListener = listener;
  }

  @Override
  public void onClick(View view) {
    mViewPager.setCurrentItem((Integer)view.getTag());
  }
}

Java Source Code List

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