add Add parameters to adjust the scan area position

Author: xiaoxie

android/src/main/java/com/chavesgu/scan/ScanDrawView.java

@@ -18,8 +18,11 @@
 import android.util.Log;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
+import android.view.ViewGroup;
 import android.view.animation.LinearInterpolator;
+import android.widget.RelativeLayout;
 
+import java.math.BigDecimal;
 import java.util.Map;
 
 import androidx.annotation.Nullable;
@@ -39,6 +42,7 @@ public class ScanDrawView extends SurfaceView implements SurfaceHolder.Callback
     private int scanLineColor;
     private boolean transparentScanLine = false;
     private double scale = .7;
+    private float up = 80.0f;
     private float dpi;
     private boolean running;
 
@@ -54,6 +58,8 @@ public ScanDrawView(Context context, Activity activity, @Nullable Map<String, Ob
         final int g = (int) args.get("g");
         final int b = (int) args.get("b");
         final double alpha = (double) args.get("a");
+        up = BigDecimal.valueOf((double) args.get("up")).floatValue();
+        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
         final int a = max(0, min(255, (int)floor(alpha * 256.0)));
         if (a==0) transparentScanLine = true;
         scanLineColor = Color.argb(a, r, g, b);
@@ -75,8 +81,8 @@ public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int width, int he
         vw = width;
         vh = height;
         areaWidth = min(vw, vh) * scale;
-        areaX = (vw - areaWidth) / 2;
-        areaY = (vh - areaWidth) / 2;
+        areaX = (vw - areaWidth) / 2 ;
+        areaY = (vh - areaWidth) / 2 ;
 
         DisplayMetrics dm = new DisplayMetrics();
         activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
@@ -128,12 +134,12 @@ private void tryDraw(final SurfaceHolder holder) {
 
     private void drawing(Canvas canvas) {
         final float x = (float) areaX;
-        final float y = (float) areaY;
+        final float y = (float) areaY - up;
         final float width = (float) areaWidth;
         final float shortWidth = (float) (areaWidth * 0.1);
         final float scanLineWidth = (float) (areaWidth * 0.8);
         final float scanLineX = (float) (vw - scanLineWidth)/2;
-        final float scanLineY = (float) (vh - scanLineWidth)/2;
+        final float scanLineY = (float) (vh - scanLineWidth)/2 - up;
 
         if (scale < 1) {
             Paint paint = new Paint();

android/src/main/java/com/chavesgu/scan/ScanPlatformView.java

@@ -7,6 +7,7 @@
 import android.util.Log;
 import android.view.View;
 
+import java.math.BigDecimal;
 import java.util.Map;
 
 import androidx.annotation.NonNull;
@@ -29,6 +30,7 @@ public class ScanPlatformView implements PlatformView, MethodChannel.MethodCallH
     private ScanViewNew scanViewNew;
     private ScanDrawView scanDrawView;
     private boolean flashlight;
+    private int up = 80;
 
     ScanPlatformView(@NonNull BinaryMessenger messenger, @NonNull Context context, @NonNull Activity activity, ActivityPluginBinding activityPluginBinding, int viewId, @Nullable Map<String, Object> args) {
         channel = new MethodChannel(messenger, "chavesgu/scan/method_"+viewId);
@@ -44,7 +46,7 @@ private void initForBinding(Map<String, Object> args) {
         this.scanViewNew.setCaptureListener(this);
 
         this.scanDrawView = new ScanDrawView(context, activity, args);
-
+        this.up = BigDecimal.valueOf((double) args.get("up")).intValue();
         this.parentView = new ParentView(context);
         this.parentView.addView(this.scanViewNew);
         this.parentView.addView(this.scanDrawView);

ios/Classes/ScanView.swift

@@ -32,6 +32,8 @@ public class ScanView: UIView,AVCaptureMetadataOutputObjectsDelegate,FlutterPlug
   var vw:CGFloat = 0;
   var vh:CGFloat = 0;
   var scale:CGFloat = 0.7;
+
+  var up = 80.0 ;
 
   init(_ frame:CGRect, viewId:Int64, args: Any?,registrar: FlutterPluginRegistrar) {
     super.init(frame: frame);
@@ -43,6 +45,7 @@ public class ScanView: UIView,AVCaptureMetadataOutputObjectsDelegate,FlutterPlug
 
     let params = args as! NSDictionary;
     self.scale = params["scale"] as! CGFloat;
+    self.up = params["up"] as! CGFloat;
     let r = params["r"] as! CGFloat;
     let g = params["g"] as! CGFloat;
     let b = params["b"] as! CGFloat;
@@ -155,7 +158,7 @@ public class ScanView: UIView,AVCaptureMetadataOutputObjectsDelegate,FlutterPlug
     let scale:CGFloat = self.scale;
     let areaWidth = min(self.vw, self.vh) * scale;
     let x = (self.vw - areaWidth) / 2;
-    let y = (self.vh - areaWidth) / 2;
+    let y = (self.vh - areaWidth) / 2 - up;
     let shortWidth:CGFloat = areaWidth * 0.1;
     let joinWidth:CGFloat = 0.5;
 
@@ -221,7 +224,7 @@ public class ScanView: UIView,AVCaptureMetadataOutputObjectsDelegate,FlutterPlug
     let scanPath = UIBezierPath();
     let scanLineWidth = areaWidth * 0.8;
     let scanLineX = (self.vw - scanLineWidth) / 2;
-    let scanLineY = (self.vh - scanLineWidth) / 2;
+    let scanLineY = (self.vh - scanLineWidth) / 2 - up;
     scanPath.move(to: CGPoint(x: scanLineX, y: scanLineY));
     scanPath.addLine(to: CGPoint(x: scanLineX + scanLineWidth, y: scanLineY));
     let scanShapeLayer = CAShapeLayer();

lib/scan.dart

@@ -23,13 +23,15 @@ class ScanView extends StatefulWidget {
     this.onCapture,
     this.scanLineColor = Colors.green,
     this.scanAreaScale = 0.7,
+    this.horizontalHeight = 80.0,
   })  : assert(scanAreaScale <= 1.0, 'scanAreaScale must <= 1.0'),
         assert(scanAreaScale > 0.0, 'scanAreaScale must > 0.0');
 
   final ScanController? controller;
   final CaptureCallback? onCapture;
   final Color scanLineColor;
   final double scanAreaScale;
+  final double horizontalHeight;
 
   @override
   State<StatefulWidget> createState() => _ScanViewState();
@@ -50,6 +52,7 @@ class _ScanViewState extends State<ScanView> {
           "b": widget.scanLineColor.blue,
           "a": widget.scanLineColor.opacity,
           "scale": widget.scanAreaScale,
+          "up": widget.horizontalHeight,
         },
         onPlatformViewCreated: (id) {
           _onPlatformViewCreated(id);
@@ -65,6 +68,7 @@ class _ScanViewState extends State<ScanView> {
           "b": widget.scanLineColor.blue,
           "a": widget.scanLineColor.opacity,
           "scale": widget.scanAreaScale,
+          "up": widget.horizontalHeight,
         },
         onPlatformViewCreated: (id) {
           _onPlatformViewCreated(id);