package com.android.app_base.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Shader;
import android.util.AttributeSet;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatTextView;

import com.android.app_base.R;


/**
 * 自定义TextView
 * 中间半透明和带渐变边框
 */
public class CustomTextView extends AppCompatTextView {

    private float borderWidth;//边框宽度
    private int borderColor;//边框颜色
    private boolean isBorderGradient;//边框是否渐变
    private int borderStartColor;//边框渐变开始颜色
    private int borderEndColor;//边框渐变结束颜色
    private float border_radius;//边框圆角

    private Paint mPaint;
    private LinearGradient shader;

    public CustomTextView(@NonNull Context context) {
        this(context,null);
    }

    public CustomTextView(@NonNull Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public CustomTextView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView);
        borderWidth = a.getDimension(R.styleable.CustomTextView_border_width,0);
        borderColor = a.getColor(R.styleable.CustomTextView_border_color,0);
        isBorderGradient = a.getBoolean(R.styleable.CustomTextView_is_border_gradient,false);
        borderStartColor = a.getColor(R.styleable.CustomTextView_border_gradient_start_color,borderColor);
        borderEndColor = a.getColor(R.styleable.CustomTextView_border_gradient_end_color,borderColor);
        border_radius = a.getDimension(R.styleable.CustomTextView_border_radius,0);
        a.recycle();

        //抗锯齿画笔
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        //防止边缘锯齿
        mPaint.setAntiAlias(true);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        //需要重写onDraw就得调用此
        this.setWillNotDraw(false);

    }

    @Override
    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);
        //画边框
        drawBorder(canvas);

    }
    private void drawBorder(Canvas canvas) {
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(borderWidth);
        if (isBorderGradient){
            shader = new LinearGradient(0,0,getWidth(),0,borderStartColor,borderEndColor, Shader.TileMode.CLAMP);
            mPaint.setShader(shader);
        }else {
            mPaint.setColor(borderColor);
        }
        if (border_radius > 0){
            float realBorderWight = borderWidth / 2;
            //需要把矩形大小左右上下各减去一半，不然圆角显示会有问题
            canvas.drawRoundRect(realBorderWight,realBorderWight,getWidth()-realBorderWight,getHeight()-realBorderWight,border_radius,border_radius,mPaint);
        }else{
            canvas.drawRect(0,0,getWidth(),getHeight(),mPaint);
        }
        mPaint.setShader(null);
    }
}