package com.moral.andbrickslib.views;

import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;
import android.widget.EditText;

import com.moral.andbrickslib.R;


/**
 * @说明： 自定义带删除按钮的EditText
 *
 */
public class ClearEditText extends EditText implements OnFocusChangeListener,
        TextWatcher {
	//EditText右侧的删除按钮
	private Drawable mClearDrawable;
	private boolean hasFoucs;

	public ClearEditText(Context context) {
		this(context, null);
	}

	public ClearEditText(Context context, AttributeSet attrs) {
		this(context, attrs, android.R.attr.editTextStyle);
	}

	public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	private void init() {
		// 获取EditText的DrawableRight,假如没有设置我们就使用默认的图片,获取图片的顺序是左上右下（0,1,2,3,）
		mClearDrawable = getCompoundDrawables()[2];
		if (mClearDrawable == null) {
			mClearDrawable = getResources().getDrawable(
					R.mipmap.icon_delete);
		}

		mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(),
				mClearDrawable.getIntrinsicHeight());
		// 默认设置隐藏图标
		setClearIconVisible(false);
		// 设置焦点改变的监听
		setOnFocusChangeListener(this);
		// 设置输入框里面内容发生改变的监听
		addTextChangedListener(this);
	}
		
	/* @说明：isInnerWidth, isInnerHeight为ture，触摸点在删除图标之内，则视为点击了删除图标
	 * event.getX() 获取相对应自身左上角的X坐标
	 * event.getY() 获取相对应自身左上角的Y坐标
	 * getWidth() 获取控件的宽度
	 * getHeight() 获取控件的高度
	 * getTotalPaddingRight() 获取删除图标左边缘到控件右边缘的距离
	 * getPaddingRight() 获取删除图标右边缘到控件右边缘的距离
	 * isInnerWidth:
	 * 	getWidth() - getTotalPaddingRight() 计算删除图标左边缘到控件左边缘的距离
	 * 	getWidth() - getPaddingRight() 计算删除图标右边缘到控件左边缘的距离
	 * isInnerHeight:
	 * 	distance 删除图标顶部边缘到控件顶部边缘的距离
	 *  distance + height 删除图标底部边缘到控件顶部边缘的距离
	 */
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if (event.getAction() == MotionEvent.ACTION_UP) {
			getParent().requestDisallowInterceptTouchEvent(false);
			if (getCompoundDrawables()[2] != null) {
				int x = (int)event.getX();
				int y = (int)event.getY();
				Rect rect = getCompoundDrawables()[2].getBounds();
				int height = rect.height();
				int distance = (getHeight() - height)/2;
				boolean isInnerWidth = x > (getWidth() - getTotalPaddingRight()) && x < (getWidth() - getPaddingRight());
				boolean isInnerHeight = y > distance && y <(distance + height);
				if (isInnerWidth && isInnerHeight) {
					this.setText("");
				}
			}
		}else if(event.getAction() == MotionEvent.ACTION_DOWN){
			getParent().requestDisallowInterceptTouchEvent(true);
		}else if(event.getAction() == MotionEvent.ACTION_MOVE){
			getParent().requestDisallowInterceptTouchEvent(true);
		}
		return super.onTouchEvent(event);
	}

	/**
	 * 当ClearEditText焦点发生变化的时候，
	 * 输入长度为零，隐藏删除图标，否则，显示删除图标
	 */
	@Override
	public void onFocusChange(View v, boolean hasFocus) {
		this.hasFoucs = hasFocus;
		if (hasFocus) {
			setClearIconVisible(getText().length() > 0);
		} else {
			setClearIconVisible(false);
		}
	}

	protected void setClearIconVisible(boolean visible) {
		Drawable right = visible ? mClearDrawable : null;
		setCompoundDrawables(getCompoundDrawables()[0],
				getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
	}

	@Override
	public void onTextChanged(CharSequence s, int start, int count, int after) {
		if (hasFoucs) {
			setClearIconVisible(s.length() > 0);
		}
	}

	@Override
	public void beforeTextChanged(CharSequence s, int start, int count,
                                  int after) {

	}

	@Override
	public void afterTextChanged(Editable s) {

	}
	

}