package cc.rome753.demo.view;

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

/**
 * Created by rome753 on 2017/3/10
 */

public class TextRatingBar extends View{

 //paddingLeft
 private int mLeft;
 //paddingTop
 private int mTop;
 //当前rating
 private int mRating;
 //总raring数
 private int mCount;
 //rating文字
 private String[] texts = {"小","中","大","超大"};
 //相邻raring的距离
 private int mUnitSize;
 //bar到底部的距离
 private int mYOffset;
 //小竖条的一半长度
 private int mMarkSize;

 Paint paint = new Paint();

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

 public TextRatingBar(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public TextRatingBar(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  mCount = 4;
  mRating = 0;
  mMarkSize = 3;
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  Log.i("test", getMeasuredWidth() + " " + getMeasuredHeight());
  mLeft = (getPaddingLeft()+getPaddingRight())/2;
  mTop = getPaddingTop();
  int barWidth = getMeasuredWidth() - 2 * mLeft;
  mUnitSize = barWidth/(mCount - 1);
  mYOffset = getMeasuredHeight() - getPaddingBottom();
 }

 @Override
 protected void onDraw(Canvas canvas) {
  paint.setStrokeWidth(2);
  paint.setColor(Color.RED);
  canvas.drawLine(mLeft,mYOffset,mLeft+mRating*mUnitSize,mYOffset,paint);
  for(int i=0;i<mCount;i++){
   paint.setColor(Color.RED);
   canvas.drawLine(mLeft+i*mUnitSize,mYOffset-mMarkSize,mLeft+i*mUnitSize,mYOffset+mMarkSize,paint);
   paint.setColor(mRating == i ? Color.RED : Color.BLACK);
   paint.setTextSize(30);
   paint.setTextAlign(Paint.Align.CENTER);
   canvas.drawText(texts[i],mLeft+i*mUnitSize,mTop,paint);
  }
  paint.setColor(Color.GRAY);
  canvas.drawLine(mLeft+mRating*mUnitSize,mYOffset,mLeft+(mCount-1)*mUnitSize,mYOffset,paint);
  canvas.drawCircle(mLeft+mRating*mUnitSize,mYOffset,10,paint);

 }

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  if(event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE){
   float x = event.getX();
   for(int i=0;i<mCount;i++){
    float distance = mLeft+i*mUnitSize - x;
    if(Math.abs(distance) < 100){
     setRating(i);
     if(onRatingListener != null){
      onRatingListener.onRating(mRating);
     }
     break;
    }
   }
  }
  return true;
 }

 public void setRating(int rating) {
  mRating = rating;
  invalidate();
 }

 private OnRatingListener onRatingListener;

 public void setOnRatingListener(OnRatingListener onRatingListener) {
  this.onRatingListener = onRatingListener;
 }

 interface OnRatingListener{
  void onRating(int rating);
 }
}

 <cc.rome753.demo.view.TextRatingBar
  android:paddingTop="20dp"
  android:paddingLeft="40dp"
  android:paddingRight="40dp"
  android:paddingBottom="35dp"
  android:layout_width="match_parent"
  android:layout_height="70dp" />