91 lines
2.9 KiB
Java
91 lines
2.9 KiB
Java
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package com.xscm.moduleutil.widget;
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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.LinearGradient;
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import android.graphics.Matrix;
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import android.graphics.Paint;
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import android.graphics.Shader;
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import android.util.AttributeSet;
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import android.widget.TextView;
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/**
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* ProjectName: CustomViewApp
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* Package: com.yde.libview
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* Description: 扫光TextView
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* Author: 姚闻达
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* CreateDate: 2021/3/11
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* UpdateUser: 更新者
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* UpdateDate: 2021/3/11 10:58
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* UpdateRemark: 更新说明
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* Version: 1.0
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*/
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public class ScanTextView extends TextView {
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//渲染器
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private LinearGradient mLinearGradient;
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//渲染范围
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private Matrix mGradientMatrix;
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//渲染的起始位置
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private int mViewWidth = 0;
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//渲染的终止距离
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private int mTranslate = 0;
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//是否启动动画
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private boolean mAnimating = true;
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//多少毫秒刷新一次
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private int speed = 50;
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private int lightColor;
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private Paint mPaint;
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public ScanTextView(Context context, AttributeSet attrs) {
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super(context, attrs);
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mPaint = getPaint();
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mGradientMatrix = new Matrix();
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}
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@SuppressLint("DrawAllocation")
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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mViewWidth = getMeasuredWidth();
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// mLinearGradient = new LinearGradient(0, 0, mViewWidth, 0, new int[] { Color.GRAY, Color.WHITE, Color.GRAY }, null, Shader.TileMode.CLAMP);
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if (mAnimating) {
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mLinearGradient = new LinearGradient(0, 0, mViewWidth, 0, new int[]{getCurrentTextColor(), lightColor, getCurrentTextColor()}, null, Shader.TileMode.CLAMP);
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} else {
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mLinearGradient = new LinearGradient(0, 0, mViewWidth, 0, new int[]{getCurrentTextColor(), getCurrentTextColor(), getCurrentTextColor()}, null, Shader.TileMode.CLAMP);
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}
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mPaint.setShader(mLinearGradient);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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if (mAnimating && mGradientMatrix != null) {
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mTranslate += mViewWidth / 10;//每次移动屏幕的1/10宽
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if (mTranslate > 2 * mViewWidth) {
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mTranslate = -mViewWidth;
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}
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mGradientMatrix.setTranslate(mTranslate, 0);
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mLinearGradient.setLocalMatrix(mGradientMatrix);//在指定矩阵上渲染
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postInvalidateDelayed(speed);
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}
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}
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@Override
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protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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super.onSizeChanged(w, h, oldw, oldh);
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}
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public void setSpeed(int speed) {
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this.speed = speed;
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}
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public void setLightColor(int lightColor) {
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this.lightColor = lightColor;
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}
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public void setScan(boolean canScan) {
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this.mAnimating = canScan;
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}
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}
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