ImageEditor/FrmMainUI.cs

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using CaptureItPlus.Libs;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;

namespace ImageEditor
{
    public partial class FrmMainUI : Form
    {
        private string _fileName = string.Empty;
        private readonly List<CustomShape> _shapes;
        private GraphicsPath _graphicsPath;
        private Shape _selectedShape = Shape.Pen;
        private Color _selectedColor = Color.Red;
        private PenSize _selectedSize = PenSize.Fine;
        private Pen _selectedPen;
        private readonly Pen _highlighterPen;
        private bool _isSaved = false;
        private CustomShape _shape;
        private int _x;
        private int _y;

        public FrmMainUI()
        {
            InitializeComponent();
            _shapes = new List<CustomShape>();
            _highlighterPen = new Pen(Color.FromArgb(95, Color.Yellow), (int)PenSize.Thick);
            UpdatePen();
        }

        public FrmMainUI(string fileName)
            : this()
        {
            _fileName = fileName;
            LoadImage(_fileName);
        }

        private void openFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!_isSaved && _shapes.Count >= 1)
            {
                var result = MessageBox.Show("Current Screenshot modified. Would you like to save it?",
                    "Screenshot Editor", MessageBoxButtons.YesNoCancel);
                if (result == DialogResult.Yes)
                {
                    SaveAsFile();
                    if (!_isSaved)
                    {
                        return;
                    }
                }
                else if (result == DialogResult.Cancel)
                {
                    return;
                }
            }