package com.smt.util.t;

import com.smt.chashizaixian.R;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

/**
 * Examples: （使用示例）
 * slipButton.setCheck(true);
 * slipButton.SetOnChangedListener(new OnChangedListener()
 * {
 *     @Override
 *     public void OnChanged(boolean CheckState)
 *     {
 *         //处理SlipButton开关事件
 *     }
 * });
**/

public class SlipButton extends View implements OnTouchListener
{
    private boolean NowChoose = false;// 记录当前按钮是否打开,true为打开,flase为关闭
    private boolean isChecked;
    private boolean OnSlip = false;// 记录用户是否在滑动的变量
    private float DownX, NowX;// 按下时的x,当前的x
    private Rect Btn_On, Btn_Off;// 打开和关闭状态下,游标的Rect
    private boolean isChgLsnOn = false;
    private OnChangedListener ChgLsn;
    private Bitmap bg_on, bg_off, slip_btn;
    public SlipButton(Context context)
    {
        super(context);
        init();
    }
    public SlipButton(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        init();
    }
    public SlipButton(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        init();
    }
    private void init()
    {// 初始化
        bg_on = BitmapFactory.decodeResource(getResources(), R.drawable.slip_left);
        bg_off = BitmapFactory.decodeResource(getResources(), R.drawable.slip_right);
        slip_btn = BitmapFactory.decodeResource(getResources(), R.drawable.slip_ball);
        Btn_On = new Rect(0, 0, slip_btn.getWidth(), slip_btn.getHeight());
        Btn_Off = new Rect(bg_off.getWidth() - slip_btn.getWidth(), 0, bg_off.getWidth(),
                slip_btn.getHeight());
        setOnTouchListener(this);// 设置监听器,也可以直接复写OnTouchEvent
    }
    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas)
    {// 绘图函数
        super.onDraw(canvas);
        Matrix matrix = new Matrix();
        Paint paint = new Paint();
        float x;
        if (NowX < (bg_on.getWidth() / 2))// 滑动到前半段与后半段的背景不同,在此做判断
        {
            x = NowX - slip_btn.getWidth() / 2;
            canvas.drawBitmap(bg_off, matrix, paint);// 画出关闭时的背景
        }
        else
        {
            x = bg_on.getWidth() - slip_btn.getWidth() / 2;
            canvas.drawBitmap(bg_on, matrix, paint);// 画出打开时的背景
        }
        if (OnSlip)// 是否是在滑动状态,
        {
            if (NowX >= bg_on.getWidth())// 是否划出指定范围,不能让游标跑到外头,必须做这个判断
                x = bg_on.getWidth() - slip_btn.getWidth() / 2;// 减去游标1/2的长度...
            else if (NowX < 0)
            {
                x = 0;
            }
            else
            {
                x = NowX - slip_btn.getWidth() / 2;
            }
        }
        else
        {// 非滑动状态
            if (NowChoose)// 根据现在的开关状态设置画游标的位置
            {
                x = Btn_Off.left;
                canvas.drawBitmap(bg_on, matrix, paint);// 初始状态为true时应该画出打开状态图片
            }
            else
                x = Btn_On.left;
        }
        if (isChecked)
        {
            canvas.drawBitmap(bg_on, matrix, paint);
            x = Btn_Off.left;
            isChecked = !isChecked;
        }
        if (x < 0)// 对游标位置进行异常判断...
            x = 0;
        else if (x > bg_on.getWidth() - slip_btn.getWidth())
            x = bg_on.getWidth() - slip_btn.getWidth();
        canvas.drawBitmap(slip_btn, x, 0, paint);// 画出游标.
    }
    
    @Override
    public boolean onTouch(View v, MotionEvent event)
    {
        switch (event.getAction())
        // 根据动作来执行代码
        {
            case MotionEvent.ACTION_MOVE:// 滑动
                NowX = event.getX();
                break;
            case MotionEvent.ACTION_DOWN:// 按下
                if (event.getX() > bg_on.getWidth() || event.getY() > bg_on.getHeight())
                    return false;
                OnSlip = true;
                DownX = event.getX();
                NowX = DownX;
                break;
            case MotionEvent.ACTION_CANCEL: // 移到控件外部
                OnSlip = false;
                boolean choose = NowChoose;
                if (NowX >= (bg_on.getWidth() / 2))
                {
                    NowX = bg_on.getWidth() - slip_btn.getWidth() / 2;
                    NowChoose = true;
                }
                else
                {
                    NowX = NowX - slip_btn.getWidth() / 2;
                    NowChoose = false;
                }
                if (isChgLsnOn && (choose != NowChoose)) // 如果设置了监听器,就调用其方法..
                    ChgLsn.OnChanged(NowChoose);
                break;
            case MotionEvent.ACTION_UP:// 松开
                OnSlip = false;
                boolean LastChoose = NowChoose;
                if (event.getX() >= (bg_on.getWidth() / 2))
                {
                    NowX = bg_on.getWidth() - slip_btn.getWidth() / 2;
                    NowChoose = true;
                }
                else
                {
                    NowX = NowX - slip_btn.getWidth() / 2;
                    NowChoose = false;
                }
                if (isChgLsnOn && (LastChoose != NowChoose)) // 如果设置了监听器,就调用其方法..
                    ChgLsn.OnChanged(NowChoose);
                break;
            default:
        }
        invalidate();// 重画控件
        return true;
    }
    
    public void SetOnChangedListener(OnChangedListener l)
    {
        // 设置监听器,当状态修改的时候
        isChgLsnOn = true;
        ChgLsn = l;
    }
    
    public interface OnChangedListener
    {
        abstract void OnChanged(boolean CheckState);
    }
    
    public void setCheck(boolean isChecked)
    {
        this.isChecked = isChecked;
        NowChoose = isChecked;
    }
}


