Xuewang365OSNeutral/app/src/main/java/com/uiui/aios/view/RulerSeekBar.java

package com.uiui.aios.view;


import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;

public class RulerSeekBar extends androidx.appcompat.widget.AppCompatSeekBar {

    /**
     * 刻度线画笔
     */
    private Paint mRulerPaint;

    /**
     * 刻度线的个数,等分数等于刻度线的个数加1
     */
    private int mRulerCount = 1;

    /**
     * 每条刻度线的宽度
     */
    private int mRulerWidth = 2;

    /**
     * 刻度线的颜色
     */
    private int mRulerColor = Color.GRAY;

    /**
     * 滑块上面是否要显示刻度线
     */
    private boolean isShowTopOfThumb = true;

    private int radius = 12;

    public RulerSeekBar(Context context) {
        super(context);
        init();
    }

    public RulerSeekBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public RulerSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    /**
     * 初始化
     */
    private void init() {
        //创建绘制刻度线的画笔
        mRulerPaint = new Paint();
        mRulerPaint.setColor(Color.parseColor("#d0cccc"));
        mRulerPaint.setAntiAlias(true);

        //Api21及以上调用，去掉滑块后面的背景
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            setSplitTrack(false);
        }
    }

    /**
     * 重写onDraw方法绘制刻度线
     *
     * @param canvas
     */
    @Override
    protected synchronized void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        //极限条件校验
        if (getWidth() <= 0 || mRulerCount <= 0) {
            return;
        }


        int thumbRadius = 0;
        if (getThumb() != null) {
            Rect rect = getThumb().getBounds();
            thumbRadius = (rect.right - rect.left) / 2;
        }
        Log.e("RulerSeekBar", "onDraw: thumbRadius = " + thumbRadius);


        //获取每一份的长度
        int length = (getWidth() - getPaddingLeft() - getPaddingRight() - (mRulerCount + 1) * (radius) - thumbRadius * 2) / (mRulerCount + 1);
        Log.e("RulerSeekBar", "onDraw: mRulerCount = " + mRulerCount);

        Log.e("RulerSeekBar", "onDraw: getWidth = " + getWidth());
        Log.e("RulerSeekBar", "onDraw: getPaddingLeft = " + getPaddingLeft());
        Log.e("RulerSeekBar", "onDraw: getPaddingRight = " + getPaddingRight());
        Log.e("RulerSeekBar", "onDraw: length = " + length);

        //计算刻度线的顶部坐标和底部坐标
        Log.e("RulerSeekBar", "onDraw: getHeight = " + getHeight());
        Log.e("RulerSeekBar", "onDraw: getMinimumHeight = " + getMinimumHeight());

        int rulerTop = getHeight() / 2 - getMinimumHeight() / 2;
        int rulerBottom = rulerTop + getMinimumHeight();
        Log.e("RulerSeekBar", "onDraw: rulerTop = " + rulerTop);
        Log.e("RulerSeekBar", "onDraw: rulerBottom = " + rulerBottom);
        int center = getHeight() / 2;

        //获取滑块的位置信息
        Rect thumbRect = null;
        if (getThumb() != null) {
            thumbRect = getThumb().getBounds();
        }
        Log.e("RulerSeekBar", "onDraw: thumbRect = " + thumbRect);

        //绘制刻度线
        for (int i = 0; i <= mRulerCount + 1; i++) {
            //计算刻度线的左边坐标和右边坐标
            int rulerLeft = i * length + getPaddingLeft();
            Log.e("RulerSeekBar", "onDraw: rulerLeft = " + rulerLeft);
            int rulerRight = rulerLeft + mRulerWidth;

            //判断是否需要绘制刻度线
            if (!isShowTopOfThumb && thumbRect != null && rulerLeft - getPaddingLeft() > thumbRect.left && rulerRight - getPaddingLeft() < thumbRect.right) {
                continue;
            }

            if (rulerLeft > thumbRect.left && rulerLeft < thumbRect.right) {
                continue;
            }

            //进行绘制
//            canvas.drawRect(rulerLeft, rulerTop, rulerRight, rulerBottom, mRulerPaint);
            canvas.drawCircle(rulerLeft + radius + thumbRadius, center, radius, mRulerPaint);
        }
    }

    /**
     * 设置刻度线的个数
     *
     * @param mRulerCount
     */
    public void setRulerCount(int mRulerCount) {
        this.mRulerCount = mRulerCount;
        requestLayout();
    }

    /**
     * 设置刻度线的宽度，单位(px)
     *
     * @param mRulerWidth
     */
    public void setRulerWidth(int mRulerWidth) {
        this.mRulerWidth = mRulerWidth;
        requestLayout();
    }

    /**
     * 设置刻度线的颜色
     *
     * @param mRulerColor
     */
    public void setRulerColor(int mRulerColor) {
        this.mRulerColor = mRulerColor;
        if (mRulerPaint != null) {
            mRulerPaint.setColor(mRulerColor);
            requestLayout();
        }
    }

    /**
     * 滑块上面是否需要显示刻度线
     *
     * @param isShowTopOfThumb
     */
    public void setShowTopOfThumb(boolean isShowTopOfThumb) {
        this.isShowTopOfThumb = isShowTopOfThumb;
        requestLayout();
    }
}