/*
 * COPYRIGHT NOTICE 
 * Copyright (C) 2014, ticktick <lujun.hust@gmail.com>
 * http://ticktick.blog.51cto.com/
 * 
 * @license under the Apache License, Version 2.0 
 *
 * @file CustomView.java 
 * @brief 给出了自定义View的模板
 * 
 * @version 1.0 
 * @author ticktick
 * @date 2014年08月14日 
 * 
 */

package com.ticktick.example.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

public class CustomView extends View {

	private static final String TAG = CustomView.class.getSimpleName();
	private static final int DEFAULT_VIEW_WIDTH = 100;
	private static final int DEFAULT_VIEW_HEIGHT = 100;
	
	public CustomView(Context context) {
 super(context);	
	}

	public CustomView(Context context, AttributeSet attrs) {
 super(context, attrs);		
	}
	
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		
 int width = measureDimension(DEFAULT_VIEW_WIDTH, widthMeasureSpec);
 int height = measureDimension(DEFAULT_VIEW_HEIGHT, heightMeasureSpec);
	 
 setMeasuredDimension(width, height);	 
		
	 Log.d(TAG, "onMeasure " + widthMeasureSpec + "," + widthMeasureSpec );
		
 //super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}
	
	protected int measureDimension( int defaultSize, int measureSpec ) {
		
 int result = defaultSize;
		
 int specMode = MeasureSpec.getMode(measureSpec);
	 int specSize = MeasureSpec.getSize(measureSpec);
	 	 
	 //1. layout给出了确定的值,比如:100dp
	 //2. layout使用的是match_parent,但父控件的size已经可以确定了,比如设置的是具体的值或者match_parent
	 if (specMode == MeasureSpec.EXACTLY) { 	 
	 	result = specSize; //建议:result直接使用确定值
	 } 
	 //1. layout使用的是wrap_content
	 //2. layout使用的是match_parent,但父控件使用的是确定的值或者wrap_content
	 else if (specMode == MeasureSpec.AT_MOST) { 	 
	 	result = Math.min(defaultSize, specSize); //建议:result不能大于specSize
	 } 
	 //UNSPECIFIED,没有任何限制,所以可以设置任何大小
	 //多半出现在自定义的父控件的情况下,期望由自控件自行决定大小
	 else {	 
	 	result = defaultSize; 
	 }
	 
	 return result;
	}
}