PageIndicator.java

package com.aincc.lib.ui.widget.page;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;

/**
 * 
 * <h3><b>PageIndicator</b></h3></br>
 * 
 * 페이지 표시 GUI <br>
 * '•' 색상 구분 표시를 활용하여 현재 페이지 및 페이지 이동을 표시한다.
 * 
 * @author aincc@barusoft.com
 * @version 1.0.0
 * @since 1.0.0
 */
public class PageIndicator extends View
{
	/**
	 * paint
	 * 
	 * @since 1.0.0
	 */
	private Paint paint;

	/**
	 * max page count (default:10)
	 * 
	 * @since 1.0.0
	 */
	private int maxPage = 10;

	/**
	 * page index
	 * 
	 * @since 1.0.0
	 */
	private int page = 0;

	/**
	 * radius value
	 * 
	 * @since 1.0.0
	 */
	private float radius;

	/**
	 * 선택색상
	 */
	private int colorSelect = 0xFFFF711C;

	/**
	 * 일반색상
	 */
	private int colorNormal = 0x80FFFFFF;

	/**
	 * click listener
	 * 
	 * @since 1.0.0
	 */
	private OnPageClickListener listener;

	/**
	 * constructor
	 * 
	 * @since 1.0.0
	 * @param context
	 */
	public PageIndicator(Context context)
	{
		super(context);
		initialize(context);
	}

	/**
	 * constructor
	 * 
	 * @since 1.0.0
	 * @param context
	 * @param attrs
	 */
	public PageIndicator(Context context, AttributeSet attrs)
	{
		super(context, attrs);
		initialize(context);
	}

	/**
	 * constructor
	 * 
	 * @since 1.0.0
	 * @param context
	 * @param attrs
	 * @param defStyle
	 */
	public PageIndicator(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
		initialize(context);
	}

	/**
	 * initialize
	 * 
	 * @since 1.0.0
	 * @param context
	 */
	private void initialize(Context context)
	{
		paint = new Paint();
		paint.setAntiAlias(true);
		radius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 5, context.getResources().getDisplayMetrics());
	}

	/**
	 * set max page
	 * 
	 * @since 1.0.0
	 * @param maxPage
	 */
	public void setMaxPage(int maxPage)
	{
		this.maxPage = maxPage;
		invalidate();
	}

	/**
	 * set current page
	 * 
	 * @since 1.0.0
	 * @param page
	 */
	public void setPage(int page)
	{
		this.page = page;
		invalidate();
	}

	/**
	 * 색상 지정
	 * 
	 * @since 1.0.0
	 * @param select
	 * @param normal
	 */
	public void setColor(int select, int normal)
	{
		this.colorSelect = select;
		this.colorNormal = normal;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see android.view.View#onDraw(android.graphics.Canvas)
	 */
	@Override
	protected void onDraw(Canvas canvas)
	{
		super.onDraw(canvas);
		float sx = (getWidth() - maxPage * (radius * 2 + radius * 2)) / 2;

		for (int i = 0; i < maxPage; i++)
		{
			if (i == page)
			{
				paint.setColor(colorSelect);
			}
			else
			{
				paint.setColor(colorNormal);
			}
			canvas.drawCircle(sx + radius + radius, getHeight() / 2, radius, paint);
			sx += (radius * 2 + radius * 2);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see android.view.View#onTouchEvent(android.view.MotionEvent)
	 */
	public synchronized boolean onTouchEvent(MotionEvent event)
	{
		float sx = (getWidth() - maxPage * (radius * 2 + radius * 2)) / 2;

		for (int i = 0; i < maxPage; i++)
		{
			if (event.getX() >= sx && event.getX() < sx + (radius * 2 + radius * 2))
			{
				page = i;
				invalidate();

				// if (event.getAction() == MotionEvent.ACTION_UP || event.getAction() == MotionEvent.ACTION_OUTSIDE || event.getAction() == MotionEvent.ACTION_CANCEL)
				// {
				if (listener != null)
				{
					listener.onPageClick(this, page);
				}
				// }
			}
			sx += (radius * 2 + radius * 2);
		}

		return true;
	}

	/**
	 * 
	 * @since 1.0.0
	 * @param listener
	 */
	public void setOnPageClickListener(OnPageClickListener listener)
	{
		this.listener = listener;
	}

	/**
	 * 
	 * <h3><b>OnPageClickListener</b></h3></br>
	 * 
	 * @author aincc@barusoft.com
	 * @version 1.0.0
	 * @since 1.0.0
	 */
	public interface OnPageClickListener
	{
		public void onPageClick(PageIndicator v, int page);
	}
}