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Add support for reducing the scanning area to the bounds of a specifi… #889

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Add support for reducing the scanning area to the bounds of a specifi… #889

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317 changes: 317 additions & 0 deletions Samples/Sample.Android/FragmentActivityCustomScanArea.cs
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Original file line number Diff line number Diff line change
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using System;
using System.Collections.Generic;
using ZXing.Mobile;
using Android.OS;

using Android.App;
using Android.Widget;
using Android.Content.PM;
using Android.Views;
using Xamarin.Essentials;
using Android.Content;
using AndroidX.ConstraintLayout.Widget;

namespace Sample.Android
{
[Activity(Label = "ZXing.Net.Mobile", Theme = "@style/Theme.AppCompat.Light", ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.KeyboardHidden)]
public class FragmentActivityCustomScanArea : AndroidX.Fragment.App.FragmentActivity
{
ZXingScannerFragment scanFragment;
Button buttonRectangle;
Button buttonSquare;
Button buttonRandom;
ImageButton buttonIncrease;
ImageButton buttonDecrease;
ToggleButton scanViewPosition;
View scanArea;
bool scanAreaIsRectangle = true;
bool isScanAreaCentered = false;

protected override void OnCreate (Bundle savedInstanceState)
{
base.OnCreate (savedInstanceState);

SetContentView (Resource.Layout.FragmentActivity);

}

protected override void OnResume ()
{
base.OnResume ();


if (scanFragment == null)
{
var zxingOverlay = LayoutInflater.FromContext(this).Inflate(Resource.Layout.ZxingOverlayCustomScanArea, null);
scanArea = zxingOverlay.FindViewById<View>(Resource.Id.scanView);

//Find all the buttons and wire up their events
buttonRectangle = zxingOverlay.FindViewById<Button>(Resource.Id.buttonSquareScanRectangle);
buttonSquare = zxingOverlay.FindViewById<Button>(Resource.Id.buttonSquareScanView);
scanViewPosition = zxingOverlay.FindViewById<ToggleButton>(Resource.Id.toggleButtonScanViewLocation);
buttonIncrease = zxingOverlay.FindViewById<ImageButton>(Resource.Id.buttonIncrease);
buttonDecrease = zxingOverlay.FindViewById<ImageButton>(Resource.Id.buttonDecrease);
buttonRandom = zxingOverlay.FindViewById<Button>(Resource.Id.buttonRandom);

buttonRectangle.Click += Rectangle_Click;
buttonSquare.Click += Square_Click;
scanViewPosition.Click += ScanViewPosition_Click;
buttonIncrease.Click += ButtonIncrease_Click;
buttonDecrease.Click += ButtonDecrease_Click;
buttonRandom.Click += ButtonRandom_Click;

scanFragment = new ZXingScannerFragment(zxingOverlay, true, scanArea);

SupportFragmentManager.BeginTransaction()
.Replace(Resource.Id.fragment_container, scanFragment)
.Commit();
}

Scan();
}

public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
=> Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

protected override void OnPause()
{
scanFragment?.StopScanning();

base.OnPause();
}

void Scan ()
{
var opts = new MobileBarcodeScanningOptions {

CameraResolutionSelector = availableResolutions => {

foreach (var ar in availableResolutions) {
Console.WriteLine ("Resolution: " + ar.Width + "x" + ar.Height);
}
return null;
}
};

scanFragment.StartScanning(result => {

var resultIntent = new Intent();
string resultText;
// Null result means scanning was cancelled
if (result == null || string.IsNullOrEmpty (result.Text)) {
resultText = "";
}
else
{
resultText = result.Text;
}
// Otherwise, proceed with result

resultIntent.PutExtra(Activity1.RESULT_EXTRA_NAME, resultText);
SetResult(Result.Ok, resultIntent);
Finish();
}, opts);
}

void ButtonRandom_Click(object sender, EventArgs e)
{
buttonRandom.PerformHapticFeedback(FeedbackConstants.KeyboardTap);
var parentLayout = (ConstraintLayout)scanArea.Parent;
var rand = new Random();

var layoutParams = (ViewGroup.MarginLayoutParams)scanArea.LayoutParameters;

if (scanAreaIsRectangle)
{
var moveUp = rand.Next(0, 100) % 2 == 0;

if (isScanAreaCentered)
{
if (moveUp)
{
layoutParams.BottomMargin = rand.Next(0, parentLayout.Height - scanArea.Height);
layoutParams.LeftMargin = rand.Next(0, parentLayout.Width - scanArea.Width);
}
else
{
layoutParams.TopMargin = rand.Next(0, parentLayout.Height - scanArea.Height);
layoutParams.RightMargin = rand.Next(0, parentLayout.Width - scanArea.Width);
}
}
else
{
if (moveUp)
{
layoutParams.BottomMargin = rand.Next(0, parentLayout.Height - scanArea.Height);
}
else
layoutParams.TopMargin = rand.Next(0, parentLayout.Height - scanArea.Height);
}
}
else
{
var moveUp = rand.Next(0, 100) % 2 == 0;

if (moveUp)
{
layoutParams.BottomMargin = rand.Next(0, parentLayout.Height - scanArea.Height);
layoutParams.LeftMargin = rand.Next(0, parentLayout.Width - scanArea.Width);
}
else
{
layoutParams.TopMargin = rand.Next(0, parentLayout.Height - scanArea.Height);
layoutParams.RightMargin = rand.Next(0, parentLayout.Width - scanArea.Width);
}
}
scanArea.LayoutParameters = layoutParams;
}

void ButtonDecrease_Click(object sender, EventArgs e)
{
buttonDecrease.PerformHapticFeedback(FeedbackConstants.KeyboardTap);
var layout = scanArea.LayoutParameters;
var parentLayout = (ConstraintLayout)scanArea.Parent;
var height = layout.Height;
var width = layout.Width;
height = (int)(height * .9);
width = (int)(width * .9);
if (height > parentLayout.Height) height = parentLayout.Height;
if (width > parentLayout.Width) width = parentLayout.Width;
layout.Height = height;
layout.Width = width;
scanArea.LayoutParameters = layout;
}

void ButtonIncrease_Click(object sender, EventArgs e)
{
buttonIncrease.PerformHapticFeedback(FeedbackConstants.KeyboardTap);
var layout = scanArea.LayoutParameters;
var parentLayout = (ConstraintLayout)scanArea.Parent;
var height = layout.Height;
var width = layout.Width;
height = (int)(height * 1.1);
width = (int)(width * 1.1);
if (height > parentLayout.Height) height = parentLayout.Height;
if (width > parentLayout.Width) width = parentLayout.Width;
layout.Height = height;
layout.Width = width;
scanArea.LayoutParameters = layout;
}

int ConvertDpToPx(int dp)
{
var density = ApplicationContext.Resources
.DisplayMetrics
.Density;
return (int)Math.Round(dp * density + .5f);
}

void ScanViewPosition_Click(object sender, EventArgs e)
{
scanViewPosition.PerformHapticFeedback(FeedbackConstants.KeyboardTap);
isScanAreaCentered = scanViewPosition.Checked;

if (scanAreaIsRectangle)
{
if (isScanAreaCentered) SetRectangleCentered();
else SetRectangleFullWidth();
}
else if (isScanAreaCentered) SetSquareCentered();
else SetSquareFullWidth();
}

void Square_Click(object sender, EventArgs e)
{
buttonSquare.PerformHapticFeedback(FeedbackConstants.KeyboardTap);
if (scanViewPosition.Checked)
{
SetSquareCentered();
}
else
{
SetSquareFullWidth();
}
}

void Rectangle_Click(object sender, EventArgs e)
{
buttonRectangle.PerformHapticFeedback(FeedbackConstants.KeyboardTap);
if (scanViewPosition.Checked)
{
SetRectangleCentered();
}
else
{
SetRectangleFullWidth();
}
}

void SetRectangleCentered()
{
var layout = (ViewGroup.MarginLayoutParams)scanArea.LayoutParameters;
layout.MarginEnd = 0;
layout.LeftMargin = 0;
layout.RightMargin = 0;
layout.TopMargin = 0;

layout.Height = ConvertDpToPx(75);
layout.Width = ConvertDpToPx(150);
scanArea.LayoutParameters = layout;
isScanAreaCentered = true;
scanAreaIsRectangle = true;
}

void SetRectangleFullWidth()
{
var layout = (ViewGroup.MarginLayoutParams)scanArea.LayoutParameters;
layout.MarginEnd = 0;
layout.LeftMargin = 0;
layout.RightMargin = 0;
layout.TopMargin = 0;
var parentLayout = (ConstraintLayout)scanArea.Parent;
layout.Height = ConvertDpToPx(120);
layout.Width = parentLayout.Width;
scanArea.LayoutParameters = layout;
isScanAreaCentered = false;
scanAreaIsRectangle = true;
}

void SetSquareCentered()
{
var layout = (ViewGroup.MarginLayoutParams)scanArea.LayoutParameters;
layout.MarginEnd = 0;
layout.LeftMargin = 0;
layout.RightMargin = 0;
layout.TopMargin = 0;
layout.Height = ConvertDpToPx(120);
layout.Width = ConvertDpToPx(120);
scanArea.LayoutParameters = layout;
isScanAreaCentered = true;
scanAreaIsRectangle = false;
}

void SetSquareFullWidth()
{
var layout = (ViewGroup.MarginLayoutParams)scanArea.LayoutParameters;
layout.MarginEnd = 0;
layout.LeftMargin = 0;
layout.RightMargin = 0;
layout.TopMargin = 0;
var parentLayout = (ConstraintLayout)scanArea.Parent;
if (DeviceDisplay.MainDisplayInfo.Orientation == DisplayOrientation.Landscape)
{
layout.Height = parentLayout.Height;
layout.Width = parentLayout.Height;
}
else
{
layout.Height = parentLayout.Width;
layout.Width = parentLayout.Width;
}
scanArea.LayoutParameters = layout;
isScanAreaCentered = false;
scanAreaIsRectangle = false;
}
}
}

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