/*
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* Copyright (C) 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zxing.scanner;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Point;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.text.Layout;
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import android.text.StaticLayout;
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import android.text.TextPaint;
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import android.util.AttributeSet;
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import android.view.View;
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import com.zxing.scanner.camera.CameraManager;
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import com.zxing.scanner.common.Scanner;
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/**
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* This view is overlaid on top of the camera preview. It adds the viewfinder rectangle and partial
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* transparency outside it, as well as the laser scanner animation and result points.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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final class ViewfinderView extends View {
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private static final int CURRENT_POINT_OPACITY = 0xA0;
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private static final int POINT_SIZE = 6;
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private CameraManager cameraManager;
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private final Paint paint;
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private Bitmap resultBitmap;
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private int animationDelay = 0;
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private Bitmap laserLineBitmap;
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private int resultColor = Scanner.color.RESULT_VIEW;//扫描成功后扫描框以外区域白色
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private int laserLineTop;// 扫描线最顶端位置
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private int laserLineHeight;//扫描线默认高度
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private int frameCornerWidth;//扫描框4角宽
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private int frameCornerLength;//扫描框4角高
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private int tipTextSize;//提示文字大小
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private int tipTextMargin;//提示文字与扫描框距离
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private ScannerOptions scannerOptions;
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public ViewfinderView(Context context, AttributeSet attrs) {
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super(context, attrs);
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paint = new Paint(Paint.ANTI_ALIAS_FLAG);
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}
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void setCameraManager(CameraManager cameraManager) {
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this.cameraManager = cameraManager;
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}
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void setScannerOptions(ScannerOptions scannerOptions) {
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this.scannerOptions = scannerOptions;
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laserLineHeight = dp2px(scannerOptions.getLaserLineHeight());
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frameCornerWidth = dp2px(scannerOptions.getFrameCornerWidth());
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frameCornerLength = dp2px(scannerOptions.getFrameCornerLength());
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tipTextSize = Scanner.sp2px(getContext(), scannerOptions.getTipTextSize());
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tipTextMargin = dp2px(scannerOptions.getTipTextToFrameMargin());
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}
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private int dp2px(int dp) {
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return Scanner.dp2px(getContext(), dp);
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}
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@Override
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public void onDraw(Canvas canvas) {
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if (cameraManager == null) {
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return;
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}
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Rect frame = cameraManager.getFramingRect();//取扫描框
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//取屏幕预览
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Rect previewFrame = cameraManager.getFramingRectInPreview();
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if (frame == null || previewFrame == null) {
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return;
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}
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//全屏不绘制扫描框以外4个区域
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if (!scannerOptions.isScanFullScreen()) {
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drawMask(canvas, frame);
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}
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// 如果有二维码结果的Bitmap，在扫取景框内绘制不透明的result Bitmap
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if (resultBitmap != null) {
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paint.setAlpha(CURRENT_POINT_OPACITY);
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canvas.drawBitmap(resultBitmap, null, frame, paint);
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} else {
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if (!scannerOptions.isFrameHide())
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drawFrame(canvas, frame);//绘制扫描框
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if (!scannerOptions.isFrameCornerHide())
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drawFrameCorner(canvas, frame);//绘制扫描框4角
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drawText(canvas, frame);// 画扫描框下面的字
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//全屏移动扫描线
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if (scannerOptions.isLaserMoveFullScreen()) {
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moveLaserSpeedFullScreen(cameraManager.getScreenResolution());//计算全屏移动位置
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drawLaserLineFullScreen(canvas, cameraManager.getScreenResolution());//绘制全屏扫描线
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} else {
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drawLaserLine(canvas, frame);//绘制扫描框内扫描线
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moveLaserSpeed(frame);//计算扫描框内移动位置
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}
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if (scannerOptions.getViewfinderCallback() != null) {
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scannerOptions.getViewfinderCallback().onDraw(this, canvas, frame);
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}
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}
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}
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private void moveLaserSpeed(Rect frame) {
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//初始化扫描线起始点为扫描框顶部位置
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if (laserLineTop == 0) {
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laserLineTop = frame.top;
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}
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int laserMoveSpeed = scannerOptions.getLaserLineMoveSpeed();
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// 每次刷新界面，扫描线往下移动 LASER_VELOCITY
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laserLineTop += laserMoveSpeed;
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if (laserLineTop >= frame.bottom) {
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laserLineTop = frame.top;
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}
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if (animationDelay == 0) {
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animationDelay = (int) ((1.0f * 1000 * laserMoveSpeed) / (frame.bottom - frame.top));
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}
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// 只刷新扫描框的内容，其他地方不刷新
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postInvalidateDelayed(animationDelay, frame.left - POINT_SIZE, frame.top - POINT_SIZE
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, frame.right + POINT_SIZE, frame.bottom + POINT_SIZE);
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}
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private void moveLaserSpeedFullScreen(Point point) {
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//初始化扫描线起始点为顶部位置
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int laserMoveSpeed = scannerOptions.getLaserLineMoveSpeed();
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// 每次刷新界面，扫描线往下移动 LASER_VELOCITY
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laserLineTop += laserMoveSpeed;
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if (laserLineTop >= point.y) {
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laserLineTop = 0;
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}
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if (animationDelay == 0) {
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animationDelay = (int) ((1.0f * 1000 * laserMoveSpeed) / point.y);
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}
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postInvalidateDelayed(animationDelay);
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}
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/**
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* 画扫描框外区域
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*
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* @param canvas
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* @param frame
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*/
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private void drawMask(Canvas canvas, Rect frame) {
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int width = canvas.getWidth();
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int height = canvas.getHeight();
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paint.setColor(resultBitmap != null ? resultColor : scannerOptions.getFrameOutsideColor());
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canvas.drawRect(0, 0, width, frame.top, paint);
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canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
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canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
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canvas.drawRect(0, frame.bottom + 1, width, height, paint);
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}
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/**
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* 绘制提示文字
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*
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* @param canvas
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* @param frame
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*/
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private void drawText(Canvas canvas, Rect frame) {
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TextPaint textPaint = new TextPaint();
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textPaint.setAntiAlias(true);
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textPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
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textPaint.setStyle(Paint.Style.FILL);
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textPaint.setColor(scannerOptions.getTipTextColor());
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textPaint.setTextSize(tipTextSize);
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float x = frame.left;//文字开始位置
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//根据 drawTextGravityBottom 文字在扫描框上方还是上文，默认下方
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float y = !scannerOptions.isTipTextToFrameTop() ? frame.bottom + tipTextMargin
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: frame.top - tipTextMargin;
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StaticLayout staticLayout = new StaticLayout(scannerOptions.getTipText(), textPaint, frame.width()
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, Layout.Alignment.ALIGN_CENTER, 1.0f, 0, false);
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canvas.save();
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canvas.translate(x, y);
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staticLayout.draw(canvas);
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canvas.restore();
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}
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/**
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* 绘制扫描框4角
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*
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* @param canvas
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* @param frame
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*/
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private void drawFrameCorner(Canvas canvas, Rect frame) {
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paint.setColor(scannerOptions.getFrameCornerColor());
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paint.setStyle(Paint.Style.FILL);
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if (scannerOptions.isFrameCornerInside()) {
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// 左上角，左
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canvas.drawRect(frame.left, frame.top, frame.left + frameCornerWidth, frame.top + frameCornerLength, paint);
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// 左上角，上
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canvas.drawRect(frame.left, frame.top, frame.left + frameCornerLength, frame.top + frameCornerWidth, paint);
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// 右上角，右
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canvas.drawRect(frame.right - frameCornerWidth, frame.top, frame.right, frame.top + frameCornerLength, paint);
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// 右上角，上
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canvas.drawRect(frame.right - frameCornerLength, frame.top, frame.right, frame.top + frameCornerWidth, paint);
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// 左下角，左
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canvas.drawRect(frame.left, frame.bottom - frameCornerLength, frame.left + frameCornerWidth, frame.bottom, paint);
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// 左下角，下
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canvas.drawRect(frame.left, frame.bottom - frameCornerWidth, frame.left + frameCornerLength, frame.bottom, paint);
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// 右下角，右
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canvas.drawRect(frame.right - frameCornerWidth, frame.bottom - frameCornerLength, frame.right, frame.bottom, paint);
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// 右下角，下
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canvas.drawRect(frame.right - frameCornerLength, frame.bottom - frameCornerWidth, frame.right, frame.bottom, paint);
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} else {
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// 左上角
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canvas.drawRect(frame.left - frameCornerWidth, frame.top, frame.left, frame.top + frameCornerLength, paint);
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canvas.drawRect(frame.left - frameCornerWidth, frame.top - frameCornerWidth, frame.left + frameCornerLength, frame.top, paint);
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// 右上角
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canvas.drawRect(frame.right, frame.top, frame.right + frameCornerWidth, frame.top + frameCornerLength, paint);
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canvas.drawRect(frame.right - frameCornerLength, frame.top - frameCornerWidth, frame.right + frameCornerWidth, frame.top, paint);
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// 左下角
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canvas.drawRect(frame.left - frameCornerWidth, frame.bottom - frameCornerLength, frame.left, frame.bottom, paint);
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canvas.drawRect(frame.left - frameCornerWidth, frame.bottom, frame.left + frameCornerLength, frame.bottom + frameCornerWidth, paint);
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// 右下角
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canvas.drawRect(frame.right, frame.bottom - frameCornerLength, frame.right + frameCornerWidth, frame.bottom, paint);
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canvas.drawRect(frame.right - frameCornerLength, frame.bottom, frame.right + frameCornerWidth, frame.bottom + frameCornerWidth, paint);
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}
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}
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/**
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* 画扫描框
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*
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* @param canvas
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* @param frame
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*/
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private void drawFrame(Canvas canvas, Rect frame) {
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paint.setColor(scannerOptions.getFrameStrokeColor());//扫描边框色
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paint.setStrokeWidth(scannerOptions.getFrameStrokeWidth());
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paint.setStyle(Paint.Style.STROKE);
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canvas.drawRect(frame, paint);
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}
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/**
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* 画扫描线
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*
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* @param canvas
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* @param frame
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*/
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private void drawLaserLine(Canvas canvas, Rect frame) {
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if (scannerOptions.getLaserStyle() == ScannerOptions.LaserStyle.COLOR_LINE) {
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paint.setStyle(Paint.Style.FILL);
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paint.setColor(scannerOptions.getLaserLineColor());// 设置扫描线颜色
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canvas.drawRect(frame.left, laserLineTop, frame.right
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, laserLineTop + laserLineHeight, paint);
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} else {
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if (laserLineBitmap == null)//图片资源文件转为 Bitmap
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laserLineBitmap = BitmapFactory.decodeResource(getResources(), scannerOptions.getLaserLineResId());
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int height = laserLineBitmap.getHeight();//取原图高
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//网格图片
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if (scannerOptions.getLaserStyle() == ScannerOptions.LaserStyle.RES_GRID) {
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RectF dstRectF = new RectF(frame.left, frame.top, frame.right, laserLineTop);
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Rect srcRect = new Rect(0, (int) (height - dstRectF.height())
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, laserLineBitmap.getWidth(), height);
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canvas.drawBitmap(laserLineBitmap, srcRect, dstRectF, paint);
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}
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//线条图片
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else {
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//如果没有设置线条高度，则用图片原始高度
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if (laserLineHeight == dp2px(ScannerOptions.DEFAULT_LASER_LINE_HEIGHT)) {
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laserLineHeight = laserLineBitmap.getHeight() / 2;
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}
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Rect laserRect = new Rect(frame.left, laserLineTop, frame.right
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, laserLineTop + laserLineHeight);
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canvas.drawBitmap(laserLineBitmap, null, laserRect, paint);
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}
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}
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}
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/**
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* 画全屏宽扫描线
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*
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* @param canvas
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* @param point
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*/
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private void drawLaserLineFullScreen(Canvas canvas, Point point) {
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if (scannerOptions.getLaserStyle() == ScannerOptions.LaserStyle.COLOR_LINE) {
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paint.setStyle(Paint.Style.FILL);
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paint.setColor(scannerOptions.getLaserLineColor());// 设置扫描线颜色
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canvas.drawRect(0, laserLineTop, point.x, laserLineTop + laserLineHeight, paint);
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} else {
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if (laserLineBitmap == null)//图片资源文件转为 Bitmap
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laserLineBitmap = BitmapFactory.decodeResource(getResources(), scannerOptions.getLaserLineResId());
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int height = laserLineBitmap.getHeight();//取原图高
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//网格图片
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if (scannerOptions.getLaserStyle() == ScannerOptions.LaserStyle.RES_GRID) {
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int dstRectFTop = 0;
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if (laserLineTop >= height) {
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dstRectFTop = laserLineTop - height;
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}
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RectF dstRectF = new RectF(0, dstRectFTop, point.x, laserLineTop);
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Rect srcRect = new Rect(0, (int) (height - dstRectF.height()), laserLineBitmap.getWidth(), height);
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canvas.drawBitmap(laserLineBitmap, srcRect, dstRectF, paint);
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}
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//线条图片
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else {
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//如果没有设置线条高度，则用图片原始高度
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if (laserLineHeight == dp2px(ScannerOptions.DEFAULT_LASER_LINE_HEIGHT)) {
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laserLineHeight = laserLineBitmap.getHeight() / 2;
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}
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Rect laserRect = new Rect(0, laserLineTop, point.x, laserLineTop + laserLineHeight);
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canvas.drawBitmap(laserLineBitmap, null, laserRect, paint);
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}
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}
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}
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void drawViewfinder() {
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Bitmap resultBitmap = this.resultBitmap;
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this.resultBitmap = null;
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if (resultBitmap != null) {
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resultBitmap.recycle();
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}
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invalidate();
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}
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/**
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* Draw a bitmap with the result points highlighted instead of the live scanning display.
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*
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* @param barcode An image of the decoded barcode.
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*/
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void drawResultBitmap(Bitmap barcode) {
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resultBitmap = barcode;
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invalidate();
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}
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void laserLineBitmapRecycle() {
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if (laserLineBitmap != null) {
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laserLineBitmap.recycle();
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laserLineBitmap = null;
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}
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}
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}
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