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package com.kingter.ynjk.widget;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.os.Handler;

import android.util.AttributeSet;

import android.util.DisplayMetrics;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.TextView;

/**

* 注意：在布局文件引用本view时,paddingLeft,paddingRigh都必须为0dp android:ellipsize="marquee"

* android:singleLine="true" 这两个属性也要加上

*/

public class MarqueeText extends TextView implements Runnable,OnClickListener {

private int currentScrollX;// 当前滚动的位置

private boolean isStop = false;

private int textWidth;

private boolean isMeasure = false;

private int screenWidth;

private Handler handler = new Handler();

private Runnable runnable = new Runnable(){

@Override

public void run() {

startScroll();

}

};

public MarqueeText(Context context) {

super(context);

init(context);

// TODO Auto-generated constructor stub

}

private void init(Context context) {

this.setOnClickListener(this);

DisplayMetrics dm = new DisplayMetrics();

((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(dm);

screenWidth = dm.widthPixels; // 屏幕宽（dip，如：320dip）

}

public MarqueeText(Context context, AttributeSet attrs) {

super(context, attrs);

init(context);

}

public MarqueeText(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

init(context);

}

@Override

protected void onDraw(Canvas canvas) {

// TODO Auto-generated method stub

super.onDraw(canvas);

if (!isMeasure) {// 文字宽度只需获取一次就可以了

getTextWidth();

isMeasure = true;

}

if(getScrollX()==0){

this.stopScroll();

}

}

/**

* 获取文字高度

*/

private void getTextWidth() {

Paint paint = this.getPaint();

String str = this.getText().toString();

textWidth = (int) paint.measureText(str);

}

//重写setText 在setText的时候重新计算text的宽度

@Override

public void setText(CharSequence text, BufferType type) {

// TODO Auto-generated method stub

super.setText(text, type);

this.isMeasure = false;

startFor0();

}

@Override

public void run() {

if (isStop) {

return;

}

currentScrollX += 2;// 滚动速度

scrollTo(currentScrollX, 0);

if (getScrollX() >=textWidth) {

scrollTo(-screenWidth, 0);

currentScrollX = -screenWidth;

// return;

}

postDelayed(this, 50);

}

// 开始滚动

public void startScroll() {

isStop = false;

this.removeCallbacks(this);

post(this);

}

// 停止滚动

public void stopScroll() {

isStop = true;

}

// 从头开始滚动

public void startFor0() {

currentScrollX = 0;

startScroll();

}

@Override

public void onClick(View v) {

// stopScroll();

// handler.removeCallbacks(runnable);

// handler.postDelayed(runnable, 5000);

this.startScroll();

}

}