dockcontent.cs

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			if (visibleState == DockState.Hidden || (visibleState != DockState.Unknown && !IsDockStateValid(visibleState)))
				throw new InvalidOperationException(ResourceHelper.GetString("DockContent.SetDockState.InvalidState"));

			SuspendSetDockState();

			DockState oldDockState = DockState;

			if (m_isHidden != isHidden)
			{
				m_isHidden = isHidden;
				Visible = !isHidden;
				if (HiddenMdiChild != null)
					HiddenMdiChild.Visible = (!IsHidden);
			}
			m_visibleState = visibleState;
			m_dockState = isHidden ? DockState.Hidden : visibleState;

			if (visibleState != DockState.Unknown)
			{
				m_isFloat = (m_visibleState == DockState.Float);

				if (Pane == null)
					Pane = DockPanel.DockPaneFactory.CreateDockPane(this, visibleState, true);
				else if (Pane.DockState != visibleState)
				{
					if (Pane.Contents.Count == 1)
						Pane.SetDockState(visibleState);
					else
						Pane = DockPanel.DockPaneFactory.CreateDockPane(this, visibleState, true);
				}
			}
			else
				Pane = null;

			SetParent(Pane);

			if (oldPane != null && !oldPane.IsDisposed && oldDockState == oldPane.DockState)
				RefreshDockPane(oldPane);

			if (Pane != null && DockState == Pane.DockState)
			{
				if ((Pane != oldPane) ||
					(Pane == oldPane && oldDockState != oldPane.DockState))
					RefreshDockPane(Pane);
			}

			if (oldDockState != DockState)
			{
				RefreshMdiIntegration();
				OnDockStateChanged(EventArgs.Empty);
			}
			ResumeSetDockState();
		}

		private void RefreshDockPane(DockPane pane)
		{
			pane.RefreshChanges();
			pane.ValidateActiveContent();
		}

		internal string PersistString
		{
			get	{	return GetPersistString();	}
		}
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="GetPersistString()"]/*'/>
		protected virtual string GetPersistString()
		{
			return GetType().ToString();
		}

		private HiddenMdiChild m_hiddenMdiChild = null;
		internal HiddenMdiChild HiddenMdiChild
		{
			get	{	return m_hiddenMdiChild;	}
		}

		private bool m_hideOnClose = false;
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Property[@name="HideOnClose"]/*'/>
		[LocalizedCategory("Category.Docking")]
		[LocalizedDescription("DockContent.HideOnClose.Description")]
		[DefaultValue(false)]
		public bool HideOnClose
		{
			get	{	return m_hideOnClose;	}
			set	{	m_hideOnClose = value;	}
		}

		/// <exclude/>
		public new MainMenu Menu
		{
			get	{	return HiddenMdiChild == null ? base.Menu : HiddenMdiChild.Menu;	}
			set
			{
				if (HiddenMdiChild == null)
					base.Menu = value;
				else
					HiddenMdiChild.Menu = value;
			}
		}

		private DockState m_showHint = DockState.Unknown;
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Property[@name="ShowHint"]/*'/>
		[LocalizedCategory("Category.Docking")]
		[LocalizedDescription("DockContent.ShowHint.Description")]
		[DefaultValue(DockState.Unknown)]
		public DockState ShowHint
		{
			get	{	return m_showHint;	}
			set
			{	
				if (!DockHelper.IsDockStateValid(value, DockableAreas))
					throw (new InvalidOperationException(ResourceHelper.GetString("DockContent.ShowHint.InvalidValue")));

				if (m_showHint == value)
					return;

				m_showHint = value;
			}
		}

		private bool m_isActivated = false;
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Property[@name="IsActivated"]/*'/>
		[Browsable(false)]
		public bool IsActivated
		{
			get	{	return m_isActivated;	}
		}
		internal void SetIsActivated(bool value)
		{
			if (m_isActivated == value)
				return;

			m_isActivated = value;
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="IsDockStateValid(DockState)"]/*'/>
		public bool IsDockStateValid(DockState dockState)
		{
			return DockHelper.IsDockStateValid(dockState, DockableAreas);
		}

		private ContextMenuStrip m_tabPageContextMenu = null;
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Property[@name="TabPageContextMenu"]/*'/>
		[LocalizedCategory("Category.Docking")]
		[LocalizedDescription("DockContent.TabPageContextMenu.Description")]
		[DefaultValue(null)]
		public ContextMenuStrip TabPageContextMenu
		{
			get	{	return m_tabPageContextMenu;	}
			set	{	m_tabPageContextMenu = value;	}
		}

		private string m_toolTipText = null;
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Property[@name="ToolTipText"]/*'/>
		[Localizable(true)]
		[Category("Appearance")]
		[LocalizedDescription("DockContent.ToolTipText.Description")]
		[DefaultValue(null)]
		public string ToolTipText
		{
			get	{	return m_toolTipText;	}
			set {	m_toolTipText = value;	}
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Activate()"]/*'/>
		public new void Activate()
		{
			if (DockPanel == null)
				base.Activate();
			else if (Pane == null)
				Show(DockPanel);
			else
			{
				IsHidden = false;
				Pane.ActiveContent = this;
				Pane.Activate();
			}
		}

		/// <exclude/>
		public new void Hide()
		{
			IsHidden = true;
		}

		internal void SetParent(Control value)
		{
			if (Parent == value)
				return;

			Control oldParent = Parent;

			//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
			// Workaround for .Net Framework bug: removing control from Form may cause form
			// unclosable. Set focus to another dummy control.
			//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
			Form form = null;
			if (Parent is DockPane)
				form = ((DockPane)Parent).FindForm();
			if (ContainsFocus)
			{
				if (form is FloatWindow)
				{
					((FloatWindow)form).DummyControl.Focus();
					form.ActiveControl = ((FloatWindow)form).DummyControl;
				}
				else if (DockPanel != null)
				{
					DockPanel.DummyControl.Focus();
					if (form != null)
						form.ActiveControl = DockPanel.DummyControl;
				}
			}
			//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

			Size = Size.Empty;	// To reduce screen flicker
			Parent = value;
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show"]/*'/>
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show()"]/*'/>
		public new void Show()
		{
			if (DockPanel == null)
				base.Show();
			else
				Show(DockPanel);
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show(DockPanel)"]/*'/>
		public void Show(DockPanel dockPanel)
		{
			if (dockPanel == null)
				throw(new ArgumentNullException(ResourceHelper.GetString("DockContent.Show.NullDockPanel")));

			if (DockState == DockState.Unknown || Pane == null)
				Show(dockPanel, DefaultShowState);
			else
				Activate();
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show(DockPanel, DockState)"]/*'/>
		public void Show(DockPanel dockPanel, DockState dockState)
		{
			if (dockPanel == null)
				throw(new ArgumentNullException(ResourceHelper.GetString("DockContent.Show.NullDockPanel")));

			if (dockState == DockState.Unknown || dockState == DockState.Hidden)
				throw(new ArgumentException(ResourceHelper.GetString("DockContent.Show.InvalidDockState")));

			DockPanel = dockPanel;

			if (dockState == DockState.Float && FloatPane == null)
				Pane = DockPanel.DockPaneFactory.CreateDockPane(this, DockState.Float, true);
			else if (PanelPane == null)
			{
				DockPane paneExisting = null;
				foreach (DockPane pane in DockPanel.Panes)
					if (pane.DockState == dockState)
					{
						paneExisting = pane;
						break;
					}

				if (paneExisting == null)
					Pane = DockPanel.DockPaneFactory.CreateDockPane(this, dockState, true);
				else
					Pane = paneExisting;
			}

			DockState = dockState;
			Activate();
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show(DockPanel, Rectangle)"]/*'/>
		public void Show(DockPanel dockPanel, Rectangle floatWindowBounds)
		{
			if (dockPanel == null)
				throw(new ArgumentNullException(ResourceHelper.GetString("DockContent.Show.NullDockPanel")));

			DockPanel = dockPanel;
			if (FloatPane == null)
			{
				IsHidden = true;	// to reduce the screen flicker
				FloatPane = DockPanel.DockPaneFactory.CreateDockPane(this, DockState.Float, false);
				FloatPane.FloatWindow.StartPosition = FormStartPosition.Manual;
			}

			FloatPane.FloatWindow.Bounds = floatWindowBounds;
			
			Show(dockPanel, DockState.Float);
			Activate();
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show(DockPane, DockContent)"]/*'/>
		public void Show(DockPane pane, DockContent beforeContent)
		{
			if (pane == null)
				throw(new ArgumentNullException(ResourceHelper.GetString("DockContent.Show.NullPane")));

			if (beforeContent != null && pane.Contents.IndexOf(beforeContent) == -1)
				throw(new ArgumentException(ResourceHelper.GetString("DockContent.Show.InvalidBeforeContent")));

			DockPanel = pane.DockPanel;
			Pane = pane;
			pane.SetContentIndex(this, pane.Contents.IndexOf(beforeContent));
			Show();
		}

		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="Show(DockPane, DockAlignment, double)"]/*'/>
		public void Show(DockPane prevPane, DockAlignment alignment, double proportion)
		{
			if (prevPane == null)
				throw(new ArgumentException(ResourceHelper.GetString("DockContent.Show.InvalidPrevPane")));

			if (DockHelper.IsDockStateAutoHide(prevPane.DockState))
				throw(new ArgumentException(ResourceHelper.GetString("DockContent.Show.InvalidPrevPane")));

			DockPanel = prevPane.DockPanel;
			DockPanel.DockPaneFactory.CreateDockPane(this, prevPane, alignment, proportion, true);
			Show();
		}

		/// <exclude/>
		protected override void OnClosed(EventArgs e)
		{
			//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
			// Workaround of .Net Framework bug to avoid main form unclosable
			//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
			if (Environment.Version.Major == 1)
			{
				if (DockPanel != null)
					DockPanel = null;
			}

			base.OnClosed (e);
		}

		/// <exclude/>
		protected override void OnTextChanged(EventArgs e)
		{
			if (m_hiddenMdiChild != null)
				m_hiddenMdiChild.Text = this.Text;
			if (DockHelper.IsDockStateAutoHide(DockState))
				DockPanel.RefreshAutoHideStrip();
			else if (Pane != null)
			{
				if (Pane.FloatWindow != null)
					Pane.FloatWindow.SetText();
				Pane.RefreshChanges();
			}

			base.OnTextChanged(e);
		}

		internal void RefreshMdiIntegration()
		{
			Form mdiParent = GetMdiParentForm();

			if (mdiParent == null)
			{
				if (HiddenMdiChild != null)
				{
					m_hiddenMdiChild.Close();
					m_hiddenMdiChild = null;
				}
			}
			else
			{
				if (HiddenMdiChild == null)
					m_hiddenMdiChild = new HiddenMdiChild(this);

				m_hiddenMdiChild.SetMdiParent(mdiParent);
			}
			
			if (DockPanel != null)
				if (DockPanel.ActiveDocument != null)
					if (DockPanel.ActiveDocument.HiddenMdiChild != null)
						DockPanel.ActiveDocument.HiddenMdiChild.Activate();
		}
		private Form GetMdiParentForm()
		{
			if (DockPanel == null)
				return null;

			if (!DockPanel.MdiIntegration)
				return null;

			if (DockState != DockState.Document)
				return null;

			Form parentMdi = DockPanel.FindForm();
			if (parentMdi != null)
				if (!parentMdi.IsMdiContainer)
					parentMdi = null;

			return parentMdi;
		}

		private DockPaneTab m_dockPaneTab = null;
		internal DockPaneTab DockPaneTab
		{
			get	{	return m_dockPaneTab;	}
		}

		private AutoHideTab m_autoHideTab = null;
		internal AutoHideTab AutoHideTab
		{
			get	{	return m_autoHideTab;	}
		}

		#region Events
		private static readonly object DockStateChangedEvent = new object();
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Event[@name="DockStateChanged"]/*'/>
		[LocalizedCategory("Category.PropertyChanged")]
		[LocalizedDescription("Pane.DockStateChanged.Description")]
		public event EventHandler DockStateChanged
		{
			add	{	Events.AddHandler(DockStateChangedEvent, value);	}
			remove	{	Events.RemoveHandler(DockStateChangedEvent, value);	}
		}
		/// <include file='CodeDoc\DockContent.xml' path='//CodeDoc/Class[@name="DockContent"]/Method[@name="OnDockStateChanged(EventArgs)"]/*'/>
		protected virtual void OnDockStateChanged(EventArgs e)
		{
			EventHandler handler = (EventHandler)Events[DockStateChangedEvent];
			if (handler != null)
				handler(this, e);
		}
		#endregion
	}
}