EffectDemo/app/src/main/java/com/xunao/effectdemo/view/GuideImageView.java

package com.xunao.effectdemo.view;

/**
 * author : 程中强
 * e-mail : 740479946@qq.com
 * date : 2022/8/216:51
 * desc :
 * version: 1.0
 */
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.os.Build;
import androidx.appcompat.widget.AppCompatImageView;
import android.util.AttributeSet;

import com.xuexiang.xui.widget.guidview.FocusShape;

/**
 * ImageView with focus area animation
 *
 * @author xuexiang
 * @since 2018/11/29 上午12:48
 */
class GuideImageView extends AppCompatImageView {

	private static final int DEFAULT_ANIM_COUNTER = 200;

	private Bitmap mBitmap;
	private Paint mBackgroundPaint, mErasePaint, mCircleBorderPaint;
	private int mBackgroundColor = Color.TRANSPARENT;
	private int mFocusBorderSize;
	private int mRoundRectRadius = 20;
	private Calculator mCalculator;
	private int mAnimCounter = 400;
	private int mStep = 1;
	private double mAnimMoveFactor = 1;
	private boolean mAnimationEnabled = true;
	private Path mPath;
	private RectF rectF;
	private int mFocusAnimationMaxValue;
	private int mFocusAnimationStep;
	private boolean isOnDraw = false;
	private FinishListener finishClick;

	public void setOnFinishListener(FinishListener finishClick){
		this.finishClick = finishClick;
	}

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

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

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

	/**
	 * Initializations for background and paints
	 */
	private void init() {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
			setLayerType(LAYER_TYPE_HARDWARE, null);
		}
		setWillNotDraw(false);
		setBackgroundColor(Color.TRANSPARENT);
		mBackgroundPaint = new Paint();
		mBackgroundPaint.setAntiAlias(true);
		mBackgroundPaint.setColor(mBackgroundColor);
		mBackgroundPaint.setAlpha(0xFF);

		mErasePaint = new Paint();
		mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
		mErasePaint.setAlpha(0xFF);
		mErasePaint.setAntiAlias(true);

		mPath = new Path();
		mCircleBorderPaint = new Paint();
		mCircleBorderPaint.setAntiAlias(true);
		int mFocusBorderColor = Color.TRANSPARENT;
		mCircleBorderPaint.setColor(mFocusBorderColor);
		mCircleBorderPaint.setStrokeWidth(mFocusBorderSize);
		mCircleBorderPaint.setStyle(Paint.Style.STROKE);

		rectF = new RectF();
	}

	/**
	 * Setting parameters for background an animation
	 *
	 * @param backgroundColor background color
	 * @param calculator      calculator object for calculations
	 */
	public void setParameters(int backgroundColor, Calculator calculator) {
		mBackgroundColor = backgroundColor;
		mAnimMoveFactor = 1;
		mCalculator = calculator;
	}

	/**
	 * Setting parameters for focus border
	 *
	 * @param focusBorderColor
	 * @param focusBorderSize
	 */
	public void setBorderParameters(int focusBorderColor, int focusBorderSize) {
		mFocusBorderSize = focusBorderSize;
		mCircleBorderPaint.setColor(focusBorderColor);
		mCircleBorderPaint.setStrokeWidth(focusBorderSize);
	}

	/**
	 * Setting round rectangle radius
	 *
	 * @param roundRectRadius
	 */
	public void setRoundRectRadius(int roundRectRadius) {
		mRoundRectRadius = roundRectRadius;
	}

	/**
	 * Enable/disable animation
	 *
	 * @param animationEnabled
	 */
	public void setAnimationEnabled(final boolean animationEnabled) {
		mAnimationEnabled = animationEnabled;
		mAnimCounter = mAnimationEnabled ? DEFAULT_ANIM_COUNTER : 0;
	}

	/**
	 * Draws background and moving focus area
	 *
	 * @param canvas draw canvas
	 */
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		if (mBitmap == null) {
			mBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
			mBitmap.eraseColor(mBackgroundColor);

		}
		canvas.drawBitmap(mBitmap, 0, 0, mBackgroundPaint);
		if (mCalculator.hasFocus()) {
			if (mCalculator.getFocusShape().equals(FocusShape.CIRCLE)) {
				drawCircle(canvas);
			} else {
				drawRoundedRectangle(canvas);
			}
			if (mAnimationEnabled) {
				if (mAnimCounter == 400) {
					mStep = -5 * mFocusAnimationStep;
				} else if (mAnimCounter == 0) {
//					mStep = mFocusAnimationStep;
					mAnimationEnabled = false;
				}
				mAnimCounter = mAnimCounter + mStep;
				postInvalidate();
			}
			if (isOnDraw){
				if (mAnimCounter == 0) {
					mStep = 15 * mFocusAnimationStep;
				} else if (mAnimCounter == 600) {
//					mStep = mFocusAnimationStep;
					isOnDraw = false;
					if (finishClick!=null){
						finishClick.onFinish();
					}

				}
				mAnimCounter = mAnimCounter + mStep;
				postInvalidate();
			}
		}
	}

	/**
	 * Draws focus circle
	 *
	 * @param canvas canvas to draw
	 */
	private void drawCircle(Canvas canvas) {
		canvas.drawCircle(mCalculator.getCircleCenterX(), mCalculator.getCircleCenterY(),
				mCalculator.circleRadius(mAnimCounter, mAnimMoveFactor), mErasePaint);

		if (mFocusBorderSize > 0) {
			mPath.reset();
			mPath.moveTo(mCalculator.getCircleCenterX(), mCalculator.getCircleCenterY());
			mPath.addCircle(mCalculator.getCircleCenterX(), mCalculator.getCircleCenterY(),
					mCalculator.circleRadius(mAnimCounter, mAnimMoveFactor), Path.Direction.CW);
			canvas.drawPath(mPath, mCircleBorderPaint);
		}
	}

	/**
	 * Draws focus rounded rectangle
	 *
	 * @param canvas canvas to draw
	 */
	private void drawRoundedRectangle(Canvas canvas) {
		float left = mCalculator.roundRectLeft(mAnimCounter, mAnimMoveFactor);
		float top = mCalculator.roundRectTop(mAnimCounter, mAnimMoveFactor);
		float right = mCalculator.roundRectRight(mAnimCounter, mAnimMoveFactor);
		float bottom = mCalculator.roundRectBottom(mAnimCounter, mAnimMoveFactor);

		rectF.set(left, top, right, bottom);
		canvas.drawRoundRect(rectF, mRoundRectRadius, mRoundRectRadius, mErasePaint);

		if (mFocusBorderSize > 0) {
			mPath.reset();
			mPath.moveTo(mCalculator.getCircleCenterX(), mCalculator.getCircleCenterY());
			mPath.addRoundRect(rectF, mRoundRectRadius, mRoundRectRadius, Path.Direction.CW);
			canvas.drawPath(mPath, mCircleBorderPaint);
		}
	}

	public void setFocusAnimationParameters(int maxValue, int step) {
		mFocusAnimationMaxValue = maxValue;
		mFocusAnimationStep = step;
	}

	public void setDraw(){
		mAnimCounter = 0;
		isOnDraw = true;
		invalidate();
	}

	interface FinishListener {
		void onFinish();
	}
}