كلاس جاهز لعمل شاشة افتتاحية احترافية

السلام عليكم ورحمة الله وبركاتة

اقدم لكم كلاس SplashScreen يقوم بعمل شاشة افتتاحية للبرنامج.

نتعلم في هذا الكلاس عدة امور منها:

- كيفية استخدام دوال API

- كيفية انشاء struct وتعاملها مع دوال API

- كيفية التعامل مع الكلمة المفتاحية static

- كيفية استخدام المكتبة System.Drawing

- كيفية عمل ظهور "FadeIn" وتلاشي "FadeOut" بطريقة جديدة

- كيفية استخدام Command Line مع البرنامج والتحكم بها

واترككم مع الشيفرة

// SplashScreen.cs

using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public class SplashScreen
{
#region ' Win32 API '

[StructLayout(LayoutKind.Sequential)]
class BlendFunction
{
		public byte BlendOp;
		public byte BlendFlags;
		public byte SourceConstantAlpha;
		public byte AlphaFormat;

		public static BlendFunction Initialize(byte alpha)
		{
		const byte AC_SRC_OVER  = 0x00;
		const byte AC_SRC_ALPHA = 0x01;

		BlendFunction blendFun  = new BlendFunction();
		blendFun.BlendOp   = AC_SRC_OVER;
		blendFun.BlendFlags  = 0;  // Must be zero.
		blendFun.SourceConstantAlpha = alpha;
		blendFun.AlphaFormat  = AC_SRC_ALPHA;
		return blendFun;
		}
}

enum ULW : uint
{
		ColorKey = 1,
		Alpha		 = 2,
		Opaque   = 4
}

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
private static extern Boolean UpdateLayeredWindow(
		IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, int crKey, BlendFunction pblend, ULW dwFlags);

[DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
private static extern IntPtr CreateCompatibleDC(IntPtr hDC);

[DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
private static extern bool DeleteDC(IntPtr hdc);

[DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
private static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

[DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
private static extern bool DeleteObject(IntPtr hObject);

#endregion

#region ' SplashForm '

private class SplashForm : Form
{		public SplashForm()
		{
				base.ShowInTaskbar   = false;
				base.FormBorderStyle = FormBorderStyle.None;
				base.StartPosition   = FormStartPosition.CenterScreen;
		}
		protected override CreateParams CreateParams
		{		get
				{		CreateParams cp = base.CreateParams;
						cp.ExStyle |= 0x80000;
						return cp;
				}
		}
}

#endregion

public static bool Show(Image image)
{
		return Show(image, 5000);
}

public static bool Show(Image image, int timer)
{
		//if(image == null) return false;

		SplashForm frm   = null;
		Bitmap  bitmap  = null;
		Graphics graphics = null;
		IntPtr  screenDc  = IntPtr.Zero;
		IntPtr  memDc   = IntPtr.Zero;
		IntPtr  hBitmap  = IntPtr.Zero;
		IntPtr  oldBitmap  = IntPtr.Zero;

		try {
		frm   = new SplashForm();
		frm.Size = image.Size;
		bitmap  = new Bitmap(image);
		graphics = frm.CreateGraphics();
		screenDc = graphics.GetHdc();
		memDc  = CreateCompatibleDC(screenDc);
		hBitmap  = bitmap.GetHbitmap(Color.FromArgb(0));
		oldBitmap = SelectObject(memDc, hBitmap);
		Size pSize = new Size(bitmap.Width, bitmap.Height);
		Point pSrc = new Point(0, 0);
		Point pDst = new Point(
		((Screen.PrimaryScreen.WorkingArea.Width - bitmap.Width) / 2),
		((Screen.PrimaryScreen.WorkingArea.Height - bitmap.Height) / 2));

		frm.Show();

		for(int i = 0; i < 255; i += 5) {
				UpdateLayeredWindow(
						frm.Handle, screenDc, ref pDst, ref pSize, memDc, ref pSrc, 0, BlendFunction.Initialize((byte)i), ULW.Alpha);
				Thread.Sleep(5);
		}

   Thread.Sleep(timer);

		for(byte i = 255; i > 0; i -= 5) {
				UpdateLayeredWindow(
						frm.Handle, screenDc, ref pDst, ref pSize, memDc, ref pSrc, 0, BlendFunction.Initialize(i), ULW.Alpha);
				Thread.Sleep(5);
		}
		frm.Close();
		return true;
		} catch {
				return false;
		} finally {
				if(image != null){
						graphics.ReleaseHdc(screenDc);
						if(!((hBitmap == IntPtr.Zero))) {
								SelectObject(memDc, oldBitmap);
								DeleteObject(hBitmap);
						} else {
								DeleteDC(memDc);
						}
				}
		}
}
}

طريقة الاستدعاء

SplashScreen.Show(Bitmap);
SplashScreen.Show(Bitmap, int);

مثال

// SplashScreenDemo.cs
namespace SplashScreenDemo {

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

class frmMain : Form 
{
		public frmMain() {
				// btnCancel
				Button btnCancel = new Button();
				btnCancel.Location  = new Point(255, 281);
				btnCancel.Text  = "&Cancel";
				btnCancel.Click  += new EventHandler(Cancel);
				// frmMain
				this.Name		= "frmMain"; 
				this.Text   = "SplashScreen Demo";
				this.StartPosition = FormStartPosition.CenterScreen;
				this.ClientSize  = new Size(342, 316);
				this.Controls.Add(btnCancel);
		}

		private void Cancel(object o, EventArgs e){
				Application.Exit();
		}

		[STAThread]
		static void Main(string[] args) {
				Application.EnableVisualStyles();
				try {
						if(args.Length > 0){
								bool splashLoaded = false;
								if(File.Exists(args[0])){ 
										switch(args.Length)
										{
												case 1:
														splashLoaded = SplashScreen.Show(Bitmap.FromFile(args[0]));
														break;

												case 2:
														splashLoaded = SplashScreen.Show(Bitmap.FromFile(args[0]), int.Parse(args[1]));
												break;
										}

										if(!splashLoaded) 
												MessageBox.Show(string.Format("Can not load SplashScreen form '{0}'", args[0]));
								} 
						} else {
								if(!SplashScreen.Show(Bitmap.FromFile(@".\SplashScreen.png"), 5000))
										MessageBox.Show("Can not load SplashScreen");
						}
				} catch(Exception ex){
						MessageBox.Show(ex.Message);
				}
				Application.Run(new frmMain());
		}
}
}

SplashScreen.zip

بالتوفيق ان شاء الله