UserSettings.cs

using Microsoft.Win32;
using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using XPExplorerBar;

namespace Ch2r
{
	public class PersistWindowState : System.ComponentModel.Component
	{
		// event info that allows form to persist extra window state data
		public delegate void WindowStateDelegate(object sender, RegistryKey key);
		public event WindowStateDelegate LoadStateEvent;
		public event WindowStateDelegate SaveStateEvent;

		private Form m_parent;
		private string m_regPath;
		private int m_normalLeft;
		private int m_normalTop;
		private int m_normalWidth;
		private int m_normalHeight;
		private FormWindowState m_windowState;
		private bool m_allowSaveMinimized = false;

		public PersistWindowState()
		{
		}

		public Form Parent
		{
			set {
				m_parent = value;

				// subscribe to parent form's events
				m_parent.Closing += new System.ComponentModel.CancelEventHandler(OnClosing);
				m_parent.Resize += new System.EventHandler(OnResize);
				m_parent.Move += new System.EventHandler(OnMove);
				m_parent.Load += new System.EventHandler(OnLoad);

				// get initial width and height in case form is never resized
				m_normalWidth = m_parent.Width;
				m_normalHeight = m_parent.Height;
			}
			get {
				return m_parent;
			}
		}

		// registry key should be set in parent form's constructor
		public string RegistryPath
		{
			set {
				m_regPath = value;
			}
			get {
				return m_regPath;
			}
		}

		public bool AllowSaveMinimized
		{
			set {
				m_allowSaveMinimized = value;
			}
		}

		private void OnResize(object sender, System.EventArgs e)
		{
			// save width and height
			if (m_parent.WindowState == FormWindowState.Normal) {
				m_normalWidth = m_parent.Width;
				m_normalHeight = m_parent.Height;
			}
		}

		private void OnMove(object sender, System.EventArgs e)
		{
			// save position
			if (m_parent.WindowState == FormWindowState.Normal) {
				m_normalLeft = m_parent.Left;
				m_normalTop = m_parent.Top;
			}
			// save state
			m_windowState = m_parent.WindowState;
		}

		private void OnClosing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			// save position, size and state
			RegistryKey key = Registry.CurrentUser.CreateSubKey(m_regPath);
			key.SetValue("Left", m_normalLeft);
			key.SetValue("Top", m_normalTop);
			key.SetValue("Width", m_normalWidth);
			key.SetValue("Height", m_normalHeight);

			// check if we are allowed to save the state as minimized (not normally)
			if (!m_allowSaveMinimized)
			{
				if (m_windowState == FormWindowState.Minimized)
					m_windowState = FormWindowState.Normal;
			}

			key.SetValue("WindowState", (int)m_windowState);

			// fire SaveState event
			if (SaveStateEvent != null)
				SaveStateEvent(this, key);
		}

		private void OnLoad(object sender, System.EventArgs e)
		{
			// attempt to read state from registry
			RegistryKey key = Registry.CurrentUser.OpenSubKey(m_regPath);
			if (key != null) {
				int left = (int)key.GetValue("Left", m_parent.Left);
				int top = (int)key.GetValue("Top", m_parent.Top);
				int width = (int)key.GetValue("Width", m_parent.Width);
				int height = (int)key.GetValue("Height", m_parent.Height);
				FormWindowState windowState = (FormWindowState)key.GetValue("WindowState", (int)m_parent.WindowState);

				m_parent.Location = new Point(left, top);
				m_parent.Size = new Size(width, height);
				m_parent.WindowState = windowState;

				// fire LoadState event
				if (LoadStateEvent != null)
					LoadStateEvent(this, key);
			}
		}
	}
}