/*
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* Copyright (C) 2011 The Android Open Source Project
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* Copyright (C) 2012 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.content.Context;
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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.view.Gravity;
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import android.view.View;
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import android.widget.HorizontalScrollView;
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import android.widget.ImageView;
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import static android.view.ViewGroup.LayoutParams.FILL_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 IconPageIndicator extends HorizontalScrollView implements PageIndicator {
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private final IcsLinearLayout mIconsLayout;
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private ViewPager mViewPager;
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private OnPageChangeListener mListener;
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private Runnable mIconSelector;
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private int mSelectedIndex;
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public IconPageIndicator(Context context) {
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this(context, null);
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}
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public IconPageIndicator(Context context, AttributeSet attrs) {
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super(context, attrs);
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setHorizontalScrollBarEnabled(false);
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mIconsLayout = new IcsLinearLayout(context, R.attr.vpiIconPageIndicatorStyle);
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addView(mIconsLayout, new LayoutParams(WRAP_CONTENT, FILL_PARENT, Gravity.CENTER));
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}
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private void animateToIcon(final int position) {
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final View iconView = mIconsLayout.getChildAt(position);
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if (mIconSelector != null) {
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removeCallbacks(mIconSelector);
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}
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mIconSelector = new Runnable() {
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public void run() {
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final int scrollPos = iconView.getLeft() - (getWidth() - iconView.getWidth()) / 2;
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smoothScrollTo(scrollPos, 0);
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mIconSelector = null;
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}
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};
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post(mIconSelector);
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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 (mIconSelector != null) {
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// Re-post the selector we saved
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post(mIconSelector);
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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 (mIconSelector != null) {
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removeCallbacks(mIconSelector);
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}
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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 == view) {
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return;
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}
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if (mViewPager != null) {
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mViewPager.setOnPageChangeListener(null);
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}
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PagerAdapter adapter = view.getAdapter();
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if (adapter == null) {
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throw new IllegalStateException("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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mIconsLayout.removeAllViews();
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IconPagerAdapter iconAdapter = (IconPagerAdapter) mViewPager.getAdapter();
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int count = iconAdapter.getCount();
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for (int i = 0; i < count; i++) {
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ImageView view = new ImageView(getContext(), null, R.attr.vpiIconPageIndicatorStyle);
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view.setImageResource(iconAdapter.getIconResId(i));
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mIconsLayout.addView(view);
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}
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if (mSelectedIndex > count) {
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mSelectedIndex = count - 1;
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}
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setCurrentItem(mSelectedIndex);
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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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@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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mSelectedIndex = item;
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mViewPager.setCurrentItem(item);
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int tabCount = mIconsLayout.getChildCount();
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for (int i = 0; i < tabCount; i++) {
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View child = mIconsLayout.getChildAt(i);
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boolean isSelected = (i == item);
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child.setSelected(isSelected);
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if (isSelected) {
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animateToIcon(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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