C# Slideshow

andera/C# Slideshow

Created 7 years ago

 

 

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 C# Slideshow

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Windows.Forms;
	using System.Runtime.InteropServices;
	using System.Drawing;
	using System.Threading;
	using Timer = System.Windows.Forms.Timer;
	using System.IO;
	namespace Slideshow
	{
	public class MainWindow : Form
	{
	// Interop code from http://www.codeproject.com/KB/cs/FullScreenDotNetApp.aspx
	[DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]
	private static extern int GetSystemMetrics(int which);
	[DllImport("user32.dll")]
	private static extern void SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter,
	int x, int y, int width, int height, uint flags);
	private const int SM_CXSCREEN = 0;
	private const int SM_CYSCREEN = 1;
	private static IntPtr HWND_TOP = IntPtr.Zero;
	private const int SWP_SHOWWINDOW = 0x0040;
	private readonly Random _rng = new Random();
	private readonly List<string> _imageList = new List<string>();
	private Image _currentImage;
	private string _dir;
	public MainWindow(string dir)
	{
	_dir = dir;
	StartImageListPopulation();
	MakeTimer();
	WindowState = FormWindowState.Maximized;
	FormBorderStyle = FormBorderStyle.None;
	TopMost = true;
	SetWindowPos(Handle, HWND_TOP, 0, 0, ScreenWidth, ScreenHeight, SWP_SHOWWINDOW);
	BackColor = Color.Black;
	}
	private int ScreenWidth
	{
	get { return GetSystemMetrics(SM_CXSCREEN); }
	}
	private int ScreenHeight
	{
	get { return GetSystemMetrics(SM_CYSCREEN); }
	}
	private void MakeTimer()
	{
	var timer = new Timer();
	timer.Interval = 5000;
	timer.Tick += new EventHandler(timer_Tick);
	timer.Enabled = true;
	}
	private static IEnumerable<string> GetDirectoryDescendants(string path)
	{
	return Directory.GetFiles(path)
	.Concat(Directory.GetDirectories(path)
	.SelectMany(directory => GetDirectoryDescendants(directory)));
	}
	private static bool IsJpeg(string file)
	{
	return Path.GetExtension(file).Equals(".jpg", StringComparison.InvariantCultureIgnoreCase);
	}
	private void PopulateImageList()
	{
	var descendants = GetDirectoryDescendants(_dir).Where(f => IsJpeg(f));
	foreach (var file in descendants)
	{
	_imageList.Add(file);
	}
	}
	private void StartImageListPopulation()
	{
	var thread = new Thread(PopulateImageList);
	thread.Priority = ThreadPriority.Lowest;
	thread.Start();
	}
	private string RandomImagePath()
	{
	var n = _imageList.Count;
	if (n == 0)
	{
	return null;
	}
	else
	{
	return _imageList[_rng.Next(n)];
	}
	}
	private Image RandomImage()
	{
	var path = RandomImagePath();
	if (path == null)
	{
	return null;
	}
	return Image.FromFile(path);
	}
	private void timer_Tick(object sender, EventArgs e)
	{
	_currentImage = RandomImage();
	Invalidate();
	}
	private Rectangle FitTo(Size imageDims, Size regionDims)
	{
	var scaling = Math.Min(1.0F, Math.Min((float) regionDims.Width / (float) imageDims.Width, (float) regionDims.Height / (float) imageDims.Height));
	var scaledImageDims = Scale(scaling, imageDims);
	var offset = Center(scaledImageDims, regionDims);
	return new Rectangle(offset, scaledImageDims);
	}
	private Point Center(Size imageDims, Size regionDims)
	{
	Func<int, int, int> average = (i, r) => (r / 2) - (i / 2);
	return new Point(average(imageDims.Width, regionDims.Width), average(imageDims.Height, regionDims.Height));
	}
	private Size Scale(float factor, Size dims)
	{
	return new Size((int) (dims.Width * factor), (int) (dims.Height * factor));
	}
	protected override void OnPaint(PaintEventArgs e)
	{
	var g = e.Graphics;
	g.Clear(Color.Black);
	if (_currentImage == null)
	{
	g.DrawString("Working...", Font, Brushes.White, 800, 600);
	}
	else
	{
	var regionDims = new Size(ScreenWidth, ScreenHeight);
	var imageDims = new Size(_currentImage.Width, _currentImage.Height);
	var destination = FitTo(imageDims, regionDims);
	g.DrawImage(_currentImage, destination);
	}
	}
	}
	public class Program
	{
	static void Main(string[] args)
	{
	Application.Run(new MainWindow(args[0]));
	}
	}
	}