//=============================================================================

 // COPYRIGHT: Prosoft-Lanz

 //=============================================================================

 //

 // $Workfile: DialogBox.cs $

 //

 // PROJECT : CodeProject Components

 // VERSION : 1.00

 // CREATION : 19.02.2003

 // AUTHOR : JCL

 //

 // DETAILS : DialogBoxes centered into the parent owner.

 //           This class implement the following objects:

 //

 //   DlgBox.ShowDialog(...)		for CommonDialog and Form

 //   MsgBox.Show(...)			for standard MessageBox

 //   AppBox.Show(...)			for standard MessageBox with ProductName as caption

 //	 ErrBox.Show(...)			for standard error MessageBox

 //

 //-----------------------------------------------------------------------------

 using System;

 using System.Drawing;

 using System.Windows.Forms;

 using System.Runtime.InteropServices;

 using System.Diagnostics;

 using CodeProject.Win32API;

 using CodeProject.Win32API.Hook;

 namespace CodeProject.Dialog

 {

 	///////////////////////////////////////////////////////////////////////

 	#region DlgBox

 	/// <summary>

 	/// Class to display a CommonDialog or modal Form centered on the owner.

 	/// </summary>

 	/// <example>

 	/// This example display the default print dialog box in the center of the parent.

 	/// <code>

 	/// PrintDialog printDlg = new PrintDialog();

 	/// if (DlgBox.ShowDialog(printDlg, parent) == DialogResult.OK)

 	///   printDocument.Print();

 	/// </code>

 	/// </example>

 	public sealed class DlgBox

 	{

 		private DlgBox() {}	// To remove the constructor from the documentation!

 		///////////////////////////////////////////////////////////////////////

 		// CommonDialog

 		/// <summary>

 		/// Show a command dialog box at the center of the active window.

 		/// </summary>

 		public static DialogResult ShowDialog(CommonDialog dlg)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = dlg.ShowDialog();

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// Show a command dialog box at the center of the owner window.

 		/// </summary>

 		public static DialogResult ShowDialog(CommonDialog dlg, IWin32Window owner)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = dlg.ShowDialog();

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// Form

 		/// <summary>

 		/// Show a form dialog box at the center of the active window.

 		/// </summary>

 		public static DialogResult ShowDialog(Form form)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = form.ShowDialog();

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// Show a form dialog box at the center of the owner window.

 		/// </summary>

 		public static DialogResult ShowDialog(Form form, IWin32Window owner)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = form.ShowDialog();

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 	}

 	#endregion

 	///////////////////////////////////////////////////////////////////////

 	#region MsgBox

 	/// <summary>

 	/// Class to display a MessageBox centered on the owner.

 	/// </summary>

 	/// <remarks>

 	/// Same methods as the standard MessageBox.

 	/// </remarks>

 	/// <example>

 	/// This example display a "Hello" message box centered on the owner.

 	/// <code>

 	/// MsgBox.Show("Hello");

 	/// </code>

 	/// </example>

 	public sealed class MsgBox

 	{

 		private MsgBox() {}	// To remove the constructor from the documentation!

 		///////////////////////////////////////////////////////////////////////

 		// text

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(string text)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(text, caption);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, caption

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(string text, string caption)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = MessageBox.Show(text, caption);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, string caption)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, caption, buttons

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(string text, string caption, MessageBoxButtons buttons)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, caption, buttons, defaultButton

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons, icon);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons, icon);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, caption, buttons, defaultButton, icon

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons, icon, defaultButton);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons, icon, defaultButton);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, caption, buttons, defaultButton, icon, options

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons, icon, defaultButton, options);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons, icon, defaultButton, options);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 	}

 	#endregion

 	///////////////////////////////////////////////////////////////////////

 	#region AppBox

 	/// <summary>

 	/// Class to display a MessageBox centered on the owner.

 	/// The MessageBox caption is always Application.ProductName.

 	/// </summary>

 	/// <remarks>

 	/// Same methods as the standard MessageBox without caption.

 	/// </remarks>

 	/// <example>

 	/// This example display an application message box centered on the owner.

 	/// <code>

 	/// AppBox.Show("Hello");

 	/// </code>

 	/// </example>

 	public sealed class AppBox

 	{

 		private AppBox() {}	// To remove the constructor from the documentation!

 		///////////////////////////////////////////////////////////////////////

 		// text

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(string text)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(text, caption);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, buttons

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(string text, MessageBoxButtons buttons)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, MessageBoxButtons buttons)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, buttons, defaultButton

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(string text, MessageBoxButtons buttons, MessageBoxIcon icon)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons, icon);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, MessageBoxButtons buttons, MessageBoxIcon icon)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons, icon);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, buttons, defaultButton, icon

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(string text, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons, icon, defaultButton);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons, icon, defaultButton);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		///////////////////////////////////////////////////////////////////////

 		// text, buttons, defaultButton, icon, options

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(string text, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)

 		{

 			CenterWindow centerWindow = new CenterWindow(IntPtr.Zero);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(text, caption, buttons, icon, defaultButton, options);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 		/// <summary>

 		/// See MSDN MessageBox() method. Caption is Application.ProductName.

 		/// </summary>

 		public static DialogResult Show(IWin32Window owner, string text, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options)

 		{

 			IntPtr handle = (owner == null) ? IntPtr.Zero: owner.Handle;

 			CenterWindow centerWindow = new CenterWindow(handle);

 			string caption = Application.ProductName;

 			DialogResult dlgResult = MessageBox.Show(owner, text, caption, buttons, icon, defaultButton, options);

 			centerWindow.Dispose();

 			return dlgResult;

 		}

 	}

 	#endregion

 	///////////////////////////////////////////////////////////////////////

 	#region ErrBox

 	/// <summary>

 	/// Class to display application error MessageBox centered on the owner.

 	/// The caption of the MessageBox is Application.ProductName.

 	/// </summary>

 	/// <example>

 	/// This example display an error message box centered on the owner.

 	/// <code>

 	/// ErrBox.Show(ex);

 	/// </code>

 	/// </example>

 	public sealed class ErrBox

 	{

 		private ErrBox() {}	// To remove the constructor from the documentation!

 		/// <summary>

 		/// Show an error MessageBox with an icon error and an OK button.

 		/// </summary>

 		/// <param name="err">The error message.</param>

 		/// <param name="owner">The owner of the error MessageBox.</param>

 		/// <returns>Dialog result of the MessageBox.</returns>

 		public static DialogResult Show(IWin32Window owner, string err)

 		{

 			string caption = Application.ProductName;

 			return MsgBox.Show(owner, err, caption, MessageBoxButtons.OK, MessageBoxIcon.Error);

 		}

 		/// <summary>

 		/// Show an error MessageBox with an icon error and an OK button.

 		/// </summary>

 		/// <param name="err">The error message.</param>

 		/// <returns>Dialog result of the MessageBox.</returns>

 		public static DialogResult Show(string err)

 		{

 			string caption = Application.ProductName;

 			return MsgBox.Show(err, caption, MessageBoxButtons.OK, MessageBoxIcon.Error);

 		}

 		/// <summary>

 		/// Show an error MessageBox with exception message, an icon error and an OK button.

 		/// </summary>

 		/// <param name="ex">Exception to be displayed.</param>

 		/// <returns>Dialog result of the MessageBox.</returns>

 		public static DialogResult Show(Exception ex)

 		{

 			string err = ex.Message;

 			while (ex.InnerException != null)

 			{

 				ex = ex.InnerException;

 				err += Environment.NewLine;

 				err += ex.Message;

 			}

 			string caption = Application.ProductName;

 			return MsgBox.Show(err, caption, MessageBoxButtons.OK, MessageBoxIcon.Error);

 		}

 		/// <summary>

 		/// Show a specialized error MessageBox centered into the parent owner.

 		/// </summary>

 		/// <param name="ex">Exception to be displayed.</param>

 		/// <param name="debugMode">true to display the full informations else false.</param>

 		/// <returns>Dialog result of the MessageBox.</returns>

 		public static DialogResult Show(Exception ex, bool debugMode)

 		{

 			if (debugMode)

 				return Show(ex);

 			else

 				return Show(ex.Message);

 		}

 	}

 	#endregion

 	///////////////////////////////////////////////////////////////////////

 	#region CenterWindow class

 	internal sealed class CenterWindow

 	{

 		public IntPtr hOwner = IntPtr.Zero;

 		private Rectangle rect;

 		public CbtHook cbtHook = null;

 		public WndProcRetHook wndProcRetHook = null;

 		public CenterWindow(IntPtr hOwner)

 		{

 			this.hOwner = hOwner;

 			this.cbtHook = new CbtHook();

 			cbtHook.WindowActivate += new CbtHook.CbtEventHandler(WndActivate);

 			cbtHook.Install();

 		}

 		public void Dispose()

 		{

 			if (wndProcRetHook != null)

 			{

 				wndProcRetHook.Uninstall();

 				wndProcRetHook = null;

 			}

 			if (cbtHook != null)

 			{

 				cbtHook.Uninstall();

 				cbtHook = null;

 			}

 		}

 		public void WndActivate(object sender, CbtEventArgs e)

 		{

 			IntPtr hMsgBox = e.wParam;

 			// try to find a howner for this message box

 			if (hOwner == IntPtr.Zero)

 				hOwner = USER32.GetActiveWindow();

 			// get the MessageBox window rect

 			RECT rectDlg = new RECT();

 			USER32.GetWindowRect(hMsgBox, ref rectDlg);

 			// get the owner window rect

 			RECT rectForm = new RECT();

 			USER32.GetWindowRect(hOwner, ref rectForm);

 			// get the biggest screen area

 			Rectangle rectScreen = API.TrueScreenRect;

 			// if no parent window, center on the primary screen

 			if (rectForm.right == rectForm.left)

 				rectForm.right = rectForm.left = Screen.PrimaryScreen.WorkingArea.Width / 2;

 			if (rectForm.bottom == rectForm.top)

 				rectForm.bottom = rectForm.top = Screen.PrimaryScreen.WorkingArea.Height / 2;

 			// center on parent

 			int dx = ((rectDlg.left + rectDlg.right) - (rectForm.left + rectForm.right)) / 2;

 			int dy = ((rectDlg.top + rectDlg.bottom) - (rectForm.top + rectForm.bottom)) / 2;

 			rect = new Rectangle(

 				rectDlg.left - dx,

 				rectDlg.top - dy,

 				rectDlg.right - rectDlg.left,

 				rectDlg.bottom - rectDlg.top);

 			// place in the screen

 			if (rect.Right > rectScreen.Right) rect.Offset(rectScreen.Right - rect.Right, 0);

 			if (rect.Bottom > rectScreen.Bottom) rect.Offset(0, rectScreen.Bottom - rect.Bottom);

 			if (rect.Left < rectScreen.Left) rect.Offset(rectScreen.Left - rect.Left, 0);

 			if (rect.Top < rectScreen.Top) rect.Offset(0, rectScreen.Top - rect.Top);

 			if (e.IsDialog)

 			{

 				// do the job when the WM_INITDIALOG message returns

 				wndProcRetHook = new WndProcRetHook(hMsgBox);

 				wndProcRetHook.WndProcRet += new WndProcRetHook.WndProcEventHandler(WndProcRet);

 				wndProcRetHook.Install();

 			}

 			else

 				USER32.MoveWindow(hMsgBox, rect.Left, rect.Top, rect.Width, rect.Height, 1);

 			// uninstall this hook

 			WindowsHook wndHook = (WindowsHook)sender;

 			Debug.Assert(cbtHook == wndHook);

 			cbtHook.Uninstall();

 			cbtHook = null;

 		}

 		public void WndProcRet(object sender, WndProcRetEventArgs e)

 		{

 			if (e.cw.message == WndMessage.WM_INITDIALOG ||

 				e.cw.message == WndMessage.WM_UNKNOWINIT)

 			{

 				USER32.MoveWindow(e.cw.hwnd, rect.Left, rect.Top, rect.Width, rect.Height, 1);

 				// uninstall this hook

 				WindowsHook wndHook = (WindowsHook)sender;

 				Debug.Assert(wndProcRetHook == wndHook);

 				wndProcRetHook.Uninstall();

 				wndProcRetHook = null;

 			}

 		}

 	}

 	#endregion

 }