/*
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* Copyright (C) 2011 The Android Open Source Project
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* Copyright (C) 2011 Jake Wharton
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.viewpagerindicator;
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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.graphics.Color;
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import androidx.viewpager.widget.PagerAdapter;
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import androidx.viewpager.widget.ViewPager;
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import androidx.viewpager.widget.ViewPager.OnPageChangeListener;
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import android.util.AttributeSet;
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import android.util.TypedValue;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.HorizontalScrollView;
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import android.widget.LinearLayout;
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import android.widget.TextView;
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import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
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import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
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/**
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* This widget implements the dynamic action bar tab behavior that can change
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* across different configurations or circumstances.
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*/
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public class SearchTabPageIndicator extends HorizontalScrollView implements
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PageIndicator {
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/**
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* Title text used when no title is provided by the adapter.
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*/
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private static final CharSequence EMPTY_TITLE = "";
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/**
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* Interface for a callback when the selected tab has been reselected.
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*/
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public interface OnTabReselectedListener {
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/**
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* Callback when the selected tab has been reselected.
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*
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* @param position Position of the current center item.
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*/
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void onTabReselected(int position);
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}
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private Runnable mTabSelector;
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/**
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* ViewPager中tab的点击事件
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*/
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private final OnClickListener mTabClickListener = new OnClickListener() {
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public void onClick(View view) {
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TabView tabView = (TabView) view;
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final int oldSelected = mViewPager.getCurrentItem();
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final int newSelected = tabView.getIndex();
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mViewPager.setCurrentItem(newSelected);
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if (oldSelected == newSelected && mTabReselectedListener != null) {
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mTabReselectedListener.onTabReselected(newSelected);
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}
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}
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};
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private final IcsLinearLayout mTabLayout;
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private ViewPager mViewPager;
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private OnPageChangeListener mListener;
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private int mMaxTabWidth;
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private int mSelectedTabIndex;
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private OnTabReselectedListener mTabReselectedListener;
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public SearchTabPageIndicator(Context context) {
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this(context, null);
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}
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public SearchTabPageIndicator(Context context, AttributeSet attrs) {
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super(context, attrs);
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setHorizontalScrollBarEnabled(false);
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mTabLayout = new IcsLinearLayout(context,
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R.attr.vpiTabPageIndicatorStyle);
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addView(mTabLayout, new ViewGroup.LayoutParams(WRAP_CONTENT,
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MATCH_PARENT));
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}
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public void setOnTabReselectedListener(OnTabReselectedListener listener) {
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mTabReselectedListener = listener;
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}
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@Override
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public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
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setFillViewport(lockedExpanded);
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final int childCount = mTabLayout.getChildCount();
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if (childCount > 1
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&& (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) {
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if (childCount > 2) {
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mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f);
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} else {
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mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2;
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}
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} else {
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mMaxTabWidth = -1;
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}
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final int oldWidth = getMeasuredWidth();
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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final int newWidth = getMeasuredWidth();
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if (lockedExpanded && oldWidth != newWidth) {
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// Recenter the tab display if we're at a new (scrollable) size.
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setCurrentItem(mSelectedTabIndex);
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}
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}
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/**
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* 单个Tab
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*
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* @param position
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*/
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@SuppressLint("ResourceAsColor")
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private void animateToTab(final int position) {
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final View tabView = mTabLayout.getChildAt(position);
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if (mTabSelector != null) {
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removeCallbacks(mTabSelector);
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}
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for (int i = 0; i < mTabLayout.getChildCount(); i++) {
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((TextView) mTabLayout.getChildAt(i)).setTextSize(
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TypedValue.COMPLEX_UNIT_SP, 15);
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((TextView) mTabLayout.getChildAt(i)).setTextColor(Color.parseColor("#999999"));
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}
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((TextView) tabView).setTextColor(Color.WHITE);
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((TextView) tabView).setTextSize(
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TypedValue.COMPLEX_UNIT_SP, 18);
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// ((TextView) tabView).setLayoutParams(new ViewGroup.LayoutParams(WRAP_CONTENT,WRAP_CONTENT));
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mTabSelector = new Runnable() {
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public void run() {
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final int scrollPos = tabView.getLeft()
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- (getWidth() - tabView.getWidth()) / 2;
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smoothScrollTo(scrollPos, 0);
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mTabSelector = null;
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}
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};
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post(mTabSelector);
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}
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@Override
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public void onAttachedToWindow() {
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super.onAttachedToWindow();
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if (mTabSelector != null) {
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// Re-post the selector we saved
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post(mTabSelector);
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}
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}
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@Override
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public void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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if (mTabSelector != null) {
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removeCallbacks(mTabSelector);
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}
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}
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/**
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* 添加tabView
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*
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* @param index
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* @param text
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* @param iconResId
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*/
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@SuppressLint("ResourceAsColor")
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private void addTab(int index, CharSequence text, int iconResId) {
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final TabView tabView = new TabView(getContext());
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tabView.mIndex = index;
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tabView.setFocusable(true);
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tabView.setOnClickListener(mTabClickListener);
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tabView.setText(text);
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tabView.setTextColor(R.color.black1);
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if (iconResId != 0) {
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tabView.setCompoundDrawablesWithIntrinsicBounds(iconResId, 0, 0, 0);
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}
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LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(WRAP_CONTENT,
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MATCH_PARENT, 1);
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mTabLayout.addView(tabView, params);
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}
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@Override
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public void onPageScrollStateChanged(int arg0) {
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if (mListener != null) {
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mListener.onPageScrollStateChanged(arg0);
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}
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}
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@Override
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public void onPageScrolled(int arg0, float arg1, int arg2) {
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if (mListener != null) {
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mListener.onPageScrolled(arg0, arg1, arg2);
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}
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}
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@Override
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public void onPageSelected(int arg0) {
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setCurrentItem(arg0);
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if (mListener != null) {
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mListener.onPageSelected(arg0);
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}
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}
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@Override
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public void setViewPager(ViewPager view) {
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if (mViewPager != null) {
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mViewPager.setOnPageChangeListener(null);
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}
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final PagerAdapter adapter = view.getAdapter();
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if (adapter == null) {
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throw new IllegalStateException(
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"ViewPager does not have adapter instance.");
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}
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mViewPager = view;
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view.setOnPageChangeListener(this);
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notifyDataSetChanged();
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}
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public void notifyDataSetChanged() {
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mTabLayout.removeAllViews();
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PagerAdapter adapter = mViewPager.getAdapter();
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IconPagerAdapter iconAdapter = null;
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if (adapter instanceof IconPagerAdapter) {
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iconAdapter = (IconPagerAdapter) adapter;
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}
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final int count = adapter.getCount();
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for (int i = 0; i < count; i++) {
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CharSequence title = adapter.getPageTitle(i);
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if (title == null) {
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title = EMPTY_TITLE;
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}
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int iconResId = 0;
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if (iconAdapter != null) {
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iconResId = iconAdapter.getIconResId(i);
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}
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addTab(i, title, iconResId);
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}
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if (mSelectedTabIndex > count) {
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mSelectedTabIndex = count - 1;
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}
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setCurrentItem(mSelectedTabIndex);
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requestLayout();
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}
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@Override
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public void setViewPager(ViewPager view, int initialPosition) {
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setViewPager(view);
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setCurrentItem(initialPosition);
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}
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/**
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* 设置当前Item
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*/
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@Override
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public void setCurrentItem(int item) {
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if (mViewPager == null) {
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throw new IllegalStateException("ViewPager has not been bound.");
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}
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mSelectedTabIndex = item;
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mViewPager.setCurrentItem(item);
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final int tabCount = mTabLayout.getChildCount();
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for (int i = 0; i < tabCount; i++) {
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final View child = mTabLayout.getChildAt(i);
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final boolean isSelected = (i == item);
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child.setSelected(isSelected);
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if (isSelected) {
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animateToTab(item);
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}
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}
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}
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@Override
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public void setOnPageChangeListener(OnPageChangeListener listener) {
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mListener = listener;
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}
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/**
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* 重写textview
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*
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* @author weikou2015
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*/
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private class TabView extends TextView {
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private int mIndex;
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public TabView(Context context) {
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super(context, null, R.attr.vpiTabPageIndicatorStyle);
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}
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@Override
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public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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// Re-measure if we went beyond our maximum size.
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if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) {
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super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth,
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MeasureSpec.EXACTLY), heightMeasureSpec);
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}
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}
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public int getIndex() {
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return mIndex;
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}
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}
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}
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