Subversion Repositories SmartDukaan

/*

 * Copyright (C) 2011 The Android Open Source Project

 * Copyright (C) 2012 Jake Wharton

 *

 * 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.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.util.AttributeSet;

import android.view.Gravity;

import android.view.View;

import android.widget.HorizontalScrollView;

import android.widget.ImageView;

import static android.view.ViewGroup.LayoutParams.FILL_PARENT;

import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

/**

 * This widget implements the dynamic action bar tab behavior that can change

 * across different configurations or circumstances.

 */

public class IconPageIndicator extends HorizontalScrollView implements PageIndicator {

    private final IcsLinearLayout mIconsLayout;

    private ViewPager mViewPager;

    private OnPageChangeListener mListener;

    private Runnable mIconSelector;

    private int mSelectedIndex;

    public IconPageIndicator(Context context) {

        this(context, null);

    }

    public IconPageIndicator(Context context, AttributeSet attrs) {

        super(context, attrs);

        setHorizontalScrollBarEnabled(false);

        mIconsLayout = new IcsLinearLayout(context, R.attr.vpiIconPageIndicatorStyle);

        addView(mIconsLayout, new LayoutParams(WRAP_CONTENT, FILL_PARENT, Gravity.CENTER));

    }

    private void animateToIcon(final int position) {

        final View iconView = mIconsLayout.getChildAt(position);

        if (mIconSelector != null) {

            removeCallbacks(mIconSelector);

        }

        mIconSelector = new Runnable() {

            public void run() {

                final int scrollPos = iconView.getLeft() - (getWidth() - iconView.getWidth()) / 2;

                smoothScrollTo(scrollPos, 0);

                mIconSelector = null;

            }

        };

        post(mIconSelector);

    }

    @Override

    public void onAttachedToWindow() {

        super.onAttachedToWindow();

        if (mIconSelector != null) {

            // Re-post the selector we saved

            post(mIconSelector);

        }

    }

    @Override

    public void onDetachedFromWindow() {

        super.onDetachedFromWindow();

        if (mIconSelector != null) {

            removeCallbacks(mIconSelector);

        }

    }

    @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);

        }

    }

    @Override

    public void setViewPager(ViewPager view) {

        if (mViewPager == view) {

            return;

        }

        if (mViewPager != null) {

            mViewPager.setOnPageChangeListener(null);

        }

        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() {

        mIconsLayout.removeAllViews();

        IconPagerAdapter iconAdapter = (IconPagerAdapter) mViewPager.getAdapter();

        int count = iconAdapter.getCount();

        for (int i = 0; i < count; i++) {

            ImageView view = new ImageView(getContext(), null, R.attr.vpiIconPageIndicatorStyle);

            view.setImageResource(iconAdapter.getIconResId(i));

            mIconsLayout.addView(view);

        }

        if (mSelectedIndex > count) {

            mSelectedIndex = count - 1;

        }

        setCurrentItem(mSelectedIndex);

        requestLayout();

    }

    @Override

    public void setViewPager(ViewPager view, int initialPosition) {

        setViewPager(view);

        setCurrentItem(initialPosition);

    }

    @Override

    public void setCurrentItem(int item) {

        if (mViewPager == null) {

            throw new IllegalStateException("ViewPager has not been bound.");

        }

        mSelectedIndex = item;

        mViewPager.setCurrentItem(item);

        int tabCount = mIconsLayout.getChildCount();

        for (int i = 0; i < tabCount; i++) {

            View child = mIconsLayout.getChildAt(i);

            boolean isSelected = (i == item);

            child.setSelected(isSelected);

            if (isSelected) {

                animateToIcon(item);

            }

        }

    }

    @Override

    public void setOnPageChangeListener(OnPageChangeListener listener) {

        mListener = listener;

    }

}