HymnalProjector/Projector/FrmPreview.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Projector
{
    public partial class FrmPreview : Form
    {
        private List<string> imagesList = new List<string>();
        private int index = 0;
        private FourChannelToStereoSampleProvider? _mixer = null;
        private FrmProjector frmProjector = new FrmProjector();
        private bool secondScreenEnabled = false;

        public FrmPreview()
        {
            InitializeComponent();

            Screen[] screens = Screen.AllScreens;
            if (screens.Length > 1)
            {
                secondScreenEnabled = true;
                Screen targetScreen = screens[1];
                frmProjector.StartPosition = FormStartPosition.Manual;
                frmProjector.Location = targetScreen.Bounds.Location;
            }
        }

        public void SetImages(string[] images, FourChannelToStereoSampleProvider mixer)
        {
            if (secondScreenEnabled && !frmProjector.Visible)
            {
                frmProjector.Show();
            }

            _mixer = mixer;
            mixer.VoiceVolume = TkVoice.Value / 10f;
            imagesList.Clear();
            imagesList.AddRange(images);
            index = 0;
            ShowImage(index);
        }

        public void Clear()
        {
            imagesList.Clear();
            PbShow.ImageLocation = null;
        }

        private void ShowImage(int index)
        {
            if (index >= 0 && index < imagesList.Count)
            {
                frmProjector.SetImage(imagesList[index]);
                PbShow.ImageLocation = imagesList[index];
                this.Text = $"Preview - {System.IO.Path.GetFileName(imagesList[index])}";

                if (index + 1 < imagesList.Count)
                {
                    TsbNext.Image = Image.FromFile(imagesList[index + 1]);
                }
                else
                {
                    TsbNext.Image = null; // No next image
                }

                if (index > 0)
                {
                    TsbPrevious.Image = Image.FromFile(imagesList[index - 1]);
                }
                else
                {
                    TsbPrevious.Image = null; // No previous image
                }
            }
            else if (index == imagesList.Count)
            {
                frmProjector.SetImage(null);
                PbShow.ImageLocation = null;
                this.Text = $"Preview - End";
                TsbNext.Image = null;
                TsbPrevious.Image = Image.FromFile(imagesList[index - 1]);
            }
            else
            {
                frmProjector.SetImage(null);
                PbShow.ImageLocation = null;
                TsbNext.Image = null;
                TsbPrevious.Image = null;
            }
        }

        private void TsbPrevious_Click(object sender, EventArgs e)
        {
            if (index > 0)
            {
                index--;
                ShowImage(index);
            }
        }

        private void TsbNext_Click(object sender, EventArgs e)
        {
            if (index < imagesList.Count)
            {
                index++;
                ShowImage(index);
            }
        }

        private void FrmPreview_Load(object sender, EventArgs e)
        {

        }

        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            if (keyData == Keys.Left)
            {
                // Handle Left arrow key press
                TsbPrevious_Click(sender: null, e: null); // Simulate click on Previous button
                return true; // Indicate that the key press has been handled and prevent default behavior
            }
            else if (keyData == Keys.Right)
            {
                // Handle Right arrow key press
                TsbNext_Click(sender: null, e: null); // Simulate click on Next button
                return true;
            }
            else if (keyData == Keys.Escape)
            {
                // Close the form when Escape is pressed
                this.Close();
            }

            return base.ProcessCmdKey(ref msg, keyData); // Allow default processing if not an arrow key
        }

        private void TkVoice_Scroll(object sender, EventArgs e)
        {
            _mixer.VoiceVolume = TkVoice.Value / 10f;
        }

        private void FrmPreview_FormClosed(object sender, FormClosedEventArgs e)
        {
            frmProjector.SetImage(null);
            //frmProjector.Close();
        }
    }
}