using System;
using System.Drawing;
using System.Runtime.InteropServices;
using Vanara.Extensions;
using Vanara.InteropServices;
using static Vanara.PInvoke.User32;

namespace Vanara.PInvoke
{
	public static partial class ComCtl32
	{
		/// <summary/>
		public const int I_CHILDRENAUTO = -2;

		/// <summary/>
		public const int I_CHILDRENCALLBACK = -1;

		/// <summary>TreeView's custom draw return meaning don't draw images. valid on CDRF_NOTIFYITEMPREPAINT</summary>
		public const int TVCDRF_NOIMAGES = 0x00010000;

		private const int TV_FIRST = 0x1100;
		private const int TVN_FIRST = -400;

		/// <summary>
		/// An application-defined callback function, which is called during a sort operation each time the relative order of two list items
		/// needs to be compared.
		/// </summary>
		/// <param name="lParam1">Corresponds to the lParam member of the first TVITEM structure for the two items being compared.</param>
		/// <param name="lParam2">Corresponds to the lParam member of the second TVITEM structure for the two items being compared.</param>
		/// <param name="lParamSort">Corresponds to the lParam member of this structure.</param>
		/// <returns>
		/// The callback function must return a negative value if the first item should precede the second, a positive value if the first
		/// item should follow the second, or zero if the two items are equivalent.
		/// </returns>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773462")]
		public delegate int PFNTVCOMPARE(IntPtr lParam1, IntPtr lParam2, IntPtr lParamSort);

		/// <summary>Action that the sender (the tree-view control) should execute on return.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773413")]
		public enum AsyncDrawRetFlags
		{
			/// <summary>
			/// Proceed to draw the image anyway, that is, synchronously extract the image and paint. Assuming the control is on the UI
			/// thread, use of this flag implies low priority UI performance, since extraction times may vary and the UI could be
			/// unresponsive for an extended period of time during extraction.
			/// </summary>
			ADRF_DRAWSYNC = 0,

			/// <summary>Do not draw an image.</summary>
			ADRF_DRAWNOTHING = 1,

			/// <summary>Draw fallback text.</summary>
			ADRF_DRAWFALLBACK = 2,

			/// <summary>Draw the image specified by iRetImageIndex.</summary>
			ADRF_DRAWIMAGE = 3,
		}

		/// <summary>Specifies the item to retrieve using TVM_GETNEXTITEM or the action for TVM_SELECTITEM.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb760143")]
		public enum TreeViewActionFlag
		{
			/// <summary>Retrieves the currently selected item. You can use the TreeView_GetSelection macro to send this message.</summary>
			TVGN_CARET = 0x0009,

			/// <summary>
			/// Retrieves the first child item of the item specified by the hitem parameter. You can use the TreeView_GetChild macro to send
			/// this message.
			/// </summary>
			TVGN_CHILD = 0x0004,

			/// <summary>
			/// Retrieves the item that is the target of a drag-and-drop operation. You can use the TreeView_GetDropHilight macro to send
			/// this message.
			/// </summary>
			TVGN_DROPHILITE = 0x0008,

			/// <summary>
			/// Retrieves the first item that is visible in the tree-view window. You can use the TreeView_GetFirstVisible macro to send this message.
			/// </summary>
			TVGN_FIRSTVISIBLE = 0x0005,

			/// <summary>
			/// Version 4.71. Retrieves the last expanded item in the tree. This does not retrieve the last item visible in the tree-view
			/// window. You can use the TreeView_GetLastVisible macro to send this message.
			/// </summary>
			TVGN_LASTVISIBLE = 0x000A,

			/// <summary>Retrieves the next sibling item. You can use the TreeView_GetNextSibling macro to send this message.</summary>
			TVGN_NEXT = 0x0001,

			/// <summary>
			/// Windows Vista and later. Retrieves the next selected item. You can use the TreeView_GetNextSelected macro to send this message.
			/// </summary>
			TVGN_NEXTSELECTED = 0x000B,

			/// <summary>
			/// Retrieves the next visible item that follows the specified item. The specified item must be visible. Use the TVM_GETITEMRECT
			/// message to determine whether an item is visible. You can use the TreeView_GetNextVisible macro to send this message.
			/// </summary>
			TVGN_NEXTVISIBLE = 0x0006,

			/// <summary>Retrieves the parent of the specified item. You can use the TreeView_GetParent macro to send this message.</summary>
			TVGN_PARENT = 0x0003,

			/// <summary>Retrieves the previous sibling item. You can use the TreeView_GetPrevSibling macro to send this message.</summary>
			TVGN_PREVIOUS = 0x0002,

			/// <summary>
			/// Retrieves the first visible item that precedes the specified item. The specified item must be visible. Use the
			/// TVM_GETITEMRECT message to determine whether an item is visible. You can use the TreeView_GetPrevVisible macro to send this message.
			/// </summary>
			TVGN_PREVIOUSVISIBLE = 0x0007,

			/// <summary>
			/// Retrieves the topmost or very first item of the tree-view control. You can use the TreeView_GetRoot macro to send this message.
			/// </summary>
			TVGN_ROOT = 0x0000,

			/// <summary>
			/// When a single item is selected, ensures that the treeview does not expand the children of that item. This is valid only if
			/// used with the TVGN_CARET flag.
			/// </summary>
			TVSI_NOSINGLEEXPAND = 0x8000
		}

		/// <summary>Action to take when using TVM_EXPAND.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773568")]
		[Flags]
		public enum TreeViewExpandFlags
		{
			/// <summary>Collapses the list.</summary>
			TVE_COLLAPSE = 0x0001,

			/// <summary>Expands the list.</summary>
			TVE_EXPAND = 0x0002,

			/// <summary>Collapses the list if it is expanded or expands it if it is collapsed.</summary>
			TVE_TOGGLE = 0x0003,

			/// <summary>
			/// Version 4.70. Partially expands the list. In this state the child items are visible and the parent item's plus sign (+),
			/// indicating that it can be expanded, is displayed. This flag must be used in combination with the TVE_EXPAND flag.
			/// </summary>
			TVE_EXPANDPARTIAL = 0x4000,

			/// <summary>
			/// Collapses the list and removes the child items. The TVIS_EXPANDEDONCE state flag is reset. This flag must be used with the
			/// TVE_COLLAPSE flag.
			/// </summary>
			TVE_COLLAPSERESET = 0x8000,
		}

		/// <summary>Information about the results of a hit test.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773448")]
		[Flags]
		public enum TreeViewHitTestFlags
		{
			/// <summary>In the client area, but below the last item.</summary>
			TVHT_NOWHERE = 0x0001,

			/// <summary>On the bitmap associated with an item.</summary>
			TVHT_ONITEMICON = 0x0002,

			/// <summary>On the label (string) associated with an item.</summary>
			TVHT_ONITEMLABEL = 0x0004,

			/// <summary>On the bitmap or label associated with an item.</summary>
			TVHT_ONITEM = TVHT_ONITEMICON | TVHT_ONITEMLABEL | TVHT_ONITEMSTATEICON,

			/// <summary>In the indentation associated with an item.</summary>
			TVHT_ONITEMINDENT = 0x0008,

			/// <summary>On the button associated with an item.</summary>
			TVHT_ONITEMBUTTON = 0x0010,

			/// <summary>In the area to the right of an item.</summary>
			TVHT_ONITEMRIGHT = 0x0020,

			/// <summary>On the state icon for a tree-view item that is in a user-defined state.</summary>
			TVHT_ONITEMSTATEICON = 0x0040,

			/// <summary>Above the client area.</summary>
			TVHT_ABOVE = 0x0100,

			/// <summary>Below the client area.</summary>
			TVHT_BELOW = 0x0200,

			/// <summary>To the right of the client area.</summary>
			TVHT_TORIGHT = 0x0400,

			/// <summary>To the left of the client area.</summary>
			TVHT_TOLEFT = 0x0800,
		}

		/// <summary>Values used as alternatives to tree item handle (HTREEITEM) in TVINSERTSTRUCT.hInsertAfter.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773448")]
		public enum TreeViewInsert
		{
			/// <summary>Inserts the item at the beginning of the list.</summary>
			TVI_FIRST = -0x0FFFF,

			/// <summary>Inserts the item at the end of the list.</summary>
			TVI_LAST = -0x0FFFE,

			/// <summary>Add the item as a root item.</summary>
			TVI_ROOT = -0x10000,

			/// <summary>Inserts the item into the list in alphabetical order.</summary>
			TVI_SORT = -0x0FFFD
		}

		/// <summary>
		/// Used in <see cref="TVITEM"/> and <see cref="TVITEMEX"/> mask members to indicate which structure members contain valid data.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773459")]
		[Flags]
		public enum TreeViewItemMask
		{
			/// <summary>The cChildren member is valid.</summary>
			TVIF_CHILDREN = 0x0040,

			/// <summary>
			/// The tree-view control will retain the supplied information and will not request it again. This flag is valid only when
			/// processing the TVN_GETDISPINFO notification.
			/// </summary>
			TVIF_DI_SETITEM = 0x1000,

			/// <summary>Version 6.00 and Windows Vista. The iExpandedImage member is valid.</summary>
			TVIF_EXPANDEDIMAGE = 0x0200,

			/// <summary>The hItem member is valid.</summary>
			TVIF_HANDLE = 0x0010,

			/// <summary>The iImage member is valid.</summary>
			TVIF_IMAGE = 0x0002,

			/// <summary>The iIntegral member is valid.</summary>
			TVIF_INTEGRAL = 0x0080,

			/// <summary>The lParam member is valid.</summary>
			TVIF_PARAM = 0x0004,

			/// <summary>The iSelectedImage member is valid.</summary>
			TVIF_SELECTEDIMAGE = 0x0020,

			/// <summary>The state and stateMask members are valid.</summary>
			TVIF_STATE = 0x0008,

			/// <summary>Version 6.00 and Windows Vista. The uStateEx member is valid.</summary>
			TVIF_STATEEX = 0x0100,

			/// <summary>The pszText and cchTextMax members are valid.</summary>
			TVIF_TEXT = 0x0001,
		}

		/// <summary>
		/// Set of bit flags and image list indexes that indicate the item's state. When setting the state of an item, the stateMask member
		/// indicates the valid bits of this member. When retrieving the state of an item, this member returns the current state for the bits
		/// indicated in the stateMask member.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773459")]
		[Flags]
		public enum TreeViewItemStates
		{
			/// <summary>
			/// The item is selected. Its appearance depends on whether it has the focus. The item will be drawn using the system colors for selection.
			/// </summary>
			TVIS_SELECTED = 0x0002,

			/// <summary>The item is selected as part of a cut-and-paste operation.</summary>
			TVIS_CUT = 0x0004,

			/// <summary>The item is selected as a drag-and-drop target.</summary>
			TVIS_DROPHILITED = 0x0008,

			/// <summary>The item is bold.</summary>
			TVIS_BOLD = 0x0010,

			/// <summary>
			/// The item's list of child items is currently expanded; that is, the child items are visible. This value applies only to parent items.
			/// </summary>
			TVIS_EXPANDED = 0x0020,

			/// <summary>
			/// The item's list of child items has been expanded at least once. The TVN_ITEMEXPANDING and TVN_ITEMEXPANDED notification codes
			/// are not generated for parent items that have this state set in response to a TVM_EXPAND message. Using TVE_COLLAPSE and
			/// TVE_COLLAPSERESET with TVM_EXPAND will cause this state to be reset. This value applies only to parent items.
			/// </summary>
			TVIS_EXPANDEDONCE = 0x0040,

			/// <summary>
			/// Version 4.70. A partially expanded tree-view item. In this state, some, but not all, of the child items are visible and the
			/// parent item's plus symbol is displayed.
			/// </summary>
			TVIS_EXPANDPARTIAL = 0x0080,

			/// <summary>Mask for the bits used to specify the item's overlay image index.</summary>
			TVIS_OVERLAYMASK = 0x0F00,

			/// <summary>Mask for the bits used to specify the item's state image index.</summary>
			TVIS_STATEIMAGEMASK = 0xF000,

			/// <summary>Same as TVIS_STATEIMAGEMASK.</summary>
			TVIS_USERMASK = 0xF000,

			/// <summary>Version 6.00 and Windows Vista. The iExpandedImage member is valid.</summary>
			TVIF_EXPANDEDIMAGE = 0x0200,

			/// <summary>Version 6.00 and Windows Vista. The uStateEx member is valid.</summary>
			TVIF_STATEEX = 0x0100
		}

		/// <summary>Tree view item extended states.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773459")]
		[Flags]
		public enum TreeViewItemStatesEx
		{
			/// <summary>
			/// Creates a flat item—the item is virtual and is not visible in the tree; instead, its children take its place in the tree
			/// hierarchy. This state is valid only when adding an item to the tree-view control.
			/// </summary>
			TVIS_EX_FLAT = 0x0001,

			/// <summary>Windows Vista and later. Creates a control that is drawn in gray, that the user cannot interact with.</summary>
			TVIS_EX_DISABLED = 0x0002,

			/// <summary>Creates a separate HWND for the item. This state is valid only when adding an item to the tree-view control.</summary>
			TVIS_EX_HWND = 0x0004,
		}

		/// <summary>
		/// Tree View Messages
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "ff486106")]
		public enum TreeViewMessage
		{
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
			TVM_DELETEITEM = TV_FIRST + 1,
			TVM_EXPAND = TV_FIRST + 2,
			TVM_GETITEMRECT = TV_FIRST + 4,
			TVM_GETCOUNT = TV_FIRST + 5,
			TVM_GETINDENT = TV_FIRST + 6,
			TVM_SETINDENT = TV_FIRST + 7,
			TVM_GETIMAGELIST = TV_FIRST + 8,
			TVM_SETIMAGELIST = TV_FIRST + 9,
			TVM_GETNEXTITEM = TV_FIRST + 10,
			TVM_SELECTITEM = TV_FIRST + 11,
			TVM_GETEDITCONTROL = TV_FIRST + 15,
			TVM_GETVISIBLECOUNT = TV_FIRST + 16,
			TVM_HITTEST = TV_FIRST + 17,
			TVM_CREATEDRAGIMAGE = TV_FIRST + 18,
			TVM_SORTCHILDREN = TV_FIRST + 19,
			TVM_ENSUREVISIBLE = TV_FIRST + 20,
			TVM_SORTCHILDRENCB = TV_FIRST + 21,
			TVM_ENDEDITLABELNOW = TV_FIRST + 22,
			TVM_SETTOOLTIPS = TV_FIRST + 24,
			TVM_GETTOOLTIPS = TV_FIRST + 25,
			TVM_SETINSERTMARK = TV_FIRST + 26,
			TVM_SETUNICODEFORMAT = CommonControlMessage.CCM_SETUNICODEFORMAT,
			TVM_GETUNICODEFORMAT = CommonControlMessage.CCM_GETUNICODEFORMAT,
			TVM_SETITEMHEIGHT = TV_FIRST + 27,
			TVM_GETITEMHEIGHT = TV_FIRST + 28,
			TVM_SETBKCOLOR = TV_FIRST + 29,
			TVM_SETTEXTCOLOR = TV_FIRST + 30,
			TVM_GETBKCOLOR = TV_FIRST + 31,
			TVM_GETTEXTCOLOR = TV_FIRST + 32,
			TVM_SETSCROLLTIME = TV_FIRST + 33,
			TVM_GETSCROLLTIME = TV_FIRST + 34,
			TVM_SETINSERTMARKCOLOR = TV_FIRST + 37,
			TVM_GETINSERTMARKCOLOR = TV_FIRST + 38,
			TVM_SETBORDER = TV_FIRST + 35,
			TVM_GETITEMSTATE = TV_FIRST + 39,
			TVM_SETLINECOLOR = TV_FIRST + 40,
			TVM_GETLINECOLOR = TV_FIRST + 41,
			TVM_MAPACCIDTOHTREEITEM = TV_FIRST + 42,
			TVM_MAPHTREEITEMTOACCID = TV_FIRST + 43,
			TVM_SETEXTENDEDSTYLE = TV_FIRST + 44,
			TVM_GETEXTENDEDSTYLE = TV_FIRST + 45,
			TVM_INSERTITEM = TV_FIRST + 50,
			TVM_SETAUTOSCROLLINFO = TV_FIRST + 59,
			TVM_SETHOT = TV_FIRST + 58,
			TVM_GETITEM = TV_FIRST + 62,
			TVM_SETITEM = TV_FIRST + 63,
			TVM_GETISEARCHSTRING = TV_FIRST + 64,
			TVM_EDITLABEL = TV_FIRST + 65,
			TVM_GETSELECTEDCOUNT = TV_FIRST + 70,
			TVM_SHOWINFOTIP = TV_FIRST + 71,
			TVM_GETITEMPARTRECT = TV_FIRST + 72,
#pragma warning restore CS1591 // Missing XML comment for publicly visible type or member
		}

		/// <summary>Tree View Notifications</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "ff486107")]
		public enum TreeViewNotification
		{
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
			TVN_ASYNCDRAW = TVN_FIRST - 20,
			TVN_BEGINDRAG = TVN_FIRST - 56,
			TVN_BEGINLABELEDIT = TVN_FIRST - 59,
			TVN_BEGINRDRAG = TVN_FIRST - 57,
			TVN_DELETEITEM = TVN_FIRST - 58,
			TVN_ENDLABELEDIT = TVN_FIRST - 60,
			TVN_GETDISPINFO = TVN_FIRST - 52,
			TVN_GETINFOTIP = TVN_FIRST - 14,
			TVN_ITEMCHANGED = TVN_FIRST - 19,
			TVN_ITEMCHANGING = TVN_FIRST - 17,
			TVN_ITEMEXPANDED = TVN_FIRST - 55,
			TVN_ITEMEXPANDING = TVN_FIRST - 54,
			TVN_KEYDOWN = TVN_FIRST - 12,
			TVN_SELCHANGED = TVN_FIRST - 51,
			TVN_SELCHANGING = TVN_FIRST - 50,
			TVN_SETDISPINFO = TVN_FIRST - 53,
			TVN_SINGLEEXPAND = TVN_FIRST - 15,
#pragma warning restore CS1591 // Missing XML comment for publicly visible type or member
		}

		/// <summary>Used as return values to the TVN_SINGLEEXPAND notification.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773553")]
		public enum TreeViewNotificationReturnBehavior
		{
			/// <summary>Allow the default behavior to occur.</summary>
			TVNRET_DEFAULT = 0,

			/// <summary>Skip default processing of the item being unselected.</summary>
			TVNRET_SKIPOLD = 1,

			/// <summary>Skip default processing of the item being selected.</summary>
			TVNRET_SKIPNEW = 2,
		}

		/// <summary>Used in the <see cref="NMTREEVIEW.action"/> action member coming through the lParam of a TVN_SELCHANGED notification.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773544")]
		public enum TreeViewSelChangedCause
		{
			/// <summary>Unknown.</summary>
			TVC_UNKNOWN = 0x0000,

			/// <summary>By a mouse click.</summary>
			TVC_BYMOUSE = 0x0001,

			/// <summary>By a keystroke.</summary>
			TVC_BYKEYBOARD = 0x0002,
		}

		/// <summary>Used as the wParam value in a TVM_SETBORDER message.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "ee663567")]
		[Flags]
		public enum TreeViewSetBorderFlags
		{
			/// <summary>Applies the specified border size to the left side of the items in the tree-view control.</summary>
			TVSBF_XBORDER = 0x00000001,

			/// <summary>Applies the specified border size to the top of the items in the tree-view control.</summary>
			TVSBF_YBORDER = 0x00000002,
		}

		/// <summary>Used as the wParam value in a TVM_SETIMAGELIST and TVM_GETIMAGELIST messages.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773747")]
		public enum TreeViewSetImageListType
		{
			/// <summary>
			/// Indicates the normal image list, which contains selected, nonselected, and overlay images for the items of a tree-view control.
			/// </summary>
			TVSIL_NORMAL = 0,

			/// <summary>
			/// Indicates the state image list. You can use state images to indicate application-defined item states. A state image is
			/// displayed to the left of an item's selected or nonselected image.
			/// </summary>
			TVSIL_STATE = 2
		}

		/// <summary>Window styles used when creating tree-view controls.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb760013")]
		[Flags]
		public enum TreeViewStyle
		{
			/// <summary>
			/// Version 4.70. Enables check boxes for items in a tree-view control. A check box is displayed only if an image is associated
			/// with the item. When set to this style, the control effectively uses DrawFrameControl to create and set a state image list
			/// containing two images. State image 1 is the unchecked box and state image 2 is the checked box. Setting the state image to
			/// zero removes the check box altogether. For more information, see Working with state image indexes.
			/// <para>Version 5.80. Displays a check box even if no image is associated with the item.</para>
			/// <para>
			/// Once a tree-view control is created with this style, the style cannot be removed. Instead, you must destroy the control and
			/// create a new one in its place. Destroying the tree-view control does not destroy the check box state image list. You must
			/// destroy it explicitly. Get the handle to the state image list by sending the tree-view control a TVM_GETIMAGELIST message.
			/// Then destroy the image list with ImageList_Destroy.
			/// </para>
			/// <para>
			/// If you want to use this style, you must set the TVS_CHECKBOXES style with SetWindowLong after you create the treeview
			/// control, and before you populate the tree. Otherwise, the checkboxes might appear unchecked, depending on timing issues.
			/// </para>
			/// </summary>
			TVS_CHECKBOXES = 0x0100,

			/// <summary>Prevents the tree-view control from sending TVN_BEGINDRAG notification codes.</summary>
			TVS_DISABLEDRAGDROP = 0x0010,

			/// <summary>Allows the user to edit the labels of tree-view items.</summary>
			TVS_EDITLABELS = 0x0008,

			/// <summary>
			/// Version 4.71. Enables full-row selection in the tree view. The entire row of the selected item is highlighted, and clicking
			/// anywhere on an item's row causes it to be selected. This style cannot be used in conjunction with the TVS_HASLINES style.
			/// </summary>
			TVS_FULLROWSELECT = 0x1000,

			/// <summary>
			/// Displays plus (+) and minus (-) buttons next to parent items. The user clicks the buttons to expand or collapse a parent
			/// item's list of child items. To include buttons with items at the root of the tree view, TVS_LINESATROOT must also be specified.
			/// </summary>
			TVS_HASBUTTONS = 0x0001,

			/// <summary>Uses lines to show the hierarchy of items.</summary>
			TVS_HASLINES = 0x0002,

			/// <summary>Version 4.71. Obtains tooltip information by sending the TVN_GETINFOTIP notification.</summary>
			TVS_INFOTIP = 0x0800,

			/// <summary>
			/// Uses lines to link items at the root of the tree-view control. This value is ignored if TVS_HASLINES is not also specified.
			/// </summary>
			TVS_LINESATROOT = 0x0004,

			/// <summary>
			/// Version 5.80. Disables horizontal scrolling in the control. The control will not display any horizontal scroll bars.
			/// </summary>
			TVS_NOHSCROLL = 0x8000,

			/// <summary>
			/// Version 4.71 Sets the height of the items to an odd height with the TVM_SETITEMHEIGHT message. By default, the height of
			/// items must be an even value.
			/// </summary>
			TVS_NONEVENHEIGHT = 0x4000,

			/// <summary>
			/// Version 4.71. Disables both horizontal and vertical scrolling in the control. The control will not display any scroll bars.
			/// </summary>
			TVS_NOSCROLL = 0x2000,

			/// <summary>Version 4.70. Disables tooltips.</summary>
			TVS_NOTOOLTIPS = 0x0080,

			/// <summary>
			/// Version 4.70. Causes text to be displayed from right-to-left (RTL). Usually, windows display text left-to-right (LTR).
			/// Windows can be mirrored to display languages such as Hebrew or Arabic that read RTL. Typically, tree-view text is displayed
			/// in the same direction as the text in its parent window. If TVS_RTLREADING is set, tree-view text reads in the opposite
			/// direction from the text in the parent window.
			/// </summary>
			TVS_RTLREADING = 0x0040,

			/// <summary>Causes a selected item to remain selected when the tree-view control loses focus.</summary>
			TVS_SHOWSELALWAYS = 0x0020,

			/// <summary>
			/// Version 4.71. Causes the item being selected to expand and the item being unselected to collapse upon selection in the tree
			/// view. If the mouse is used to single-click the selected item and that item is closed, it will be expanded. If the user holds
			/// down the CTRL key while selecting an item, the item being unselected will not be collapsed.
			/// <para>
			/// Version 5.80. Causes the item being selected to expand and the item being unselected to collapse upon selection in the tree
			/// view. If the user holds down the CTRL key while selecting an item, the item being unselected will not be collapsed.
			/// </para>
			/// </summary>
			TVS_SINGLEEXPAND = 0x0400,

			/// <summary>Version 4.70. Enables hot tracking in a tree-view control.</summary>
			TVS_TRACKSELECT = 0x0200,
		}

		/// <summary>
		/// Extended styles used when creating tree-view controls. The value of extended styles is a bitwise combination of these styles.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb759981")]
		[Flags]
		public enum TreeViewStyleEx
		{
			/// <summary>Windows Vista. Remove the horizontal scroll bar and auto-scroll depending on mouse position.</summary>
			TVS_EX_AUTOHSCROLL = 0x0020,

			/// <summary>Windows Vista. Include dimmed checkbox state if the control has the TVS_CHECKBOXES style.</summary>
			TVS_EX_DIMMEDCHECKBOXES = 0x0200,

			/// <summary>Windows Vista. Specifies how the background is erased or filled.</summary>
			TVS_EX_DOUBLEBUFFER = 0x0004,

			/// <summary>Windows Vista. Retrieves calendar grid information.</summary>
			TVS_EX_DRAWIMAGEASYNC = 0x0400,

			/// <summary>Windows Vista. Include exclusion checkbox state if the control has the TVS_CHECKBOXES style.</summary>
			TVS_EX_EXCLUSIONCHECKBOXES = 0x0100,

			/// <summary>
			/// Windows Vista. Fade expando buttons in or out when the mouse moves away or into a state of hovering over the control.
			/// </summary>
			TVS_EX_FADEINOUTEXPANDOS = 0x0040,

			/// <summary>Not supported. Do not use.</summary>
			TVS_EX_MULTISELECT = 0x0002,

			/// <summary>Windows Vista. Do not indent the tree view for the expando buttons.</summary>
			TVS_EX_NOINDENTSTATE = 0x0008,

			/// <summary>
			/// Windows Vista. Intended for internal use; not recommended for use in applications. Do not collapse the previously selected
			/// tree-view item unless it has the same parent as the new selection. This style must be used with the TVS_SINGLEEXPAND style.
			/// <note>This style may not be supported in future versions of Comctl32.dll. Also, this style is not defined in commctrl.h.</note>
			/// </summary>
			TVS_EX_NOSINGLECOLLAPSE = 0x0001,

			/// <summary>Windows Vista. Include partial checkbox state if the control has the TVS_CHECKBOXES style.</summary>
			TVS_EX_PARTIALCHECKBOXES = 0x0080,

			/// <summary>Windows Vista. Allow rich tooltips in the tree view (custom drawn with icon and text).</summary>
			TVS_EX_RICHTOOLTIP = 0x0010,
		}

		/// <summary>Tree view button item part.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773442")]
		public enum TVITEMPART
		{
			/// <summary>Button item part.</summary>
			TVGIPR_BUTTON = 0x0001,
		}

		/// <summary>Provides a handle to a tree view item.</summary>
		[StructLayout(LayoutKind.Sequential)]
		public struct HTREEITEM
		{
			private IntPtr handle;

			/// <summary>Initializes a new instance of the <see cref="HTREEITEM"/> struct.</summary>
			/// <param name="preexistingHandle">An <see cref="IntPtr"/> object that represents the pre-existing handle to use.</param>
			public HTREEITEM(IntPtr preexistingHandle) => handle = preexistingHandle;

			/// <summary>Returns an invalid handle by instantiating a <see cref="HTREEITEM"/> object with <see cref="IntPtr.Zero"/>.</summary>
			public static HTREEITEM NULL => new HTREEITEM(IntPtr.Zero);

			/// <summary>Gets a value indicating whether this instance is a null handle.</summary>
			public bool IsNull => handle == IntPtr.Zero;

			/// <summary>Performs an explicit conversion from <see cref="HTREEITEM"/> to <see cref="IntPtr"/>.</summary>
			/// <param name="h">The handle.</param>
			/// <returns>The result of the conversion.</returns>
			public static explicit operator IntPtr(HTREEITEM h) => h.handle;

			/// <summary>Performs an implicit conversion from <see cref="IntPtr"/> to <see cref="HTREEITEM"/>.</summary>
			/// <param name="h">The pointer to a handle.</param>
			/// <returns>The result of the conversion.</returns>
			public static implicit operator HTREEITEM(IntPtr h) => new HTREEITEM(h);

			/// <summary>Implements the operator !=.</summary>
			/// <param name="h1">The first handle.</param>
			/// <param name="h2">The second handle.</param>
			/// <returns>The result of the operator.</returns>
			public static bool operator !=(HTREEITEM h1, HTREEITEM h2) => !(h1 == h2);

			/// <summary>Implements the operator ==.</summary>
			/// <param name="h1">The first handle.</param>
			/// <param name="h2">The second handle.</param>
			/// <returns>The result of the operator.</returns>
			public static bool operator ==(HTREEITEM h1, HTREEITEM h2) => h1.Equals(h2);

			/// <inheritdoc/>
			public override bool Equals(object obj) => obj is HTREEITEM h && handle == h.handle;

			/// <inheritdoc/>
			public override int GetHashCode() => handle.GetHashCode();
		}

		/// <summary>
		/// Contains information about a tree-view notification message. This structure is identical to the NM_TREEVIEW structure, but it has
		/// been renamed to follow current naming conventions.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773411")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct NMTREEVIEW
		{
			/// <summary>NMHDR structure that contains information about this notification message.</summary>
			public NMHDR hdr;

			/// <summary>
			/// Notification-specific action flag. This member is used with the following notification codes: TVN_ITEMEXPANDING,
			/// TVN_ITEMEXPANDED, TVN_SELCHANGING, TVN_SELCHANGED. For the possible action flag values, see TVM_EXPAND and TVN_SELCHANGED.
			/// </summary>
			public int action;

			/// <summary>
			/// TVITEM structure that contains information about the old item state. This member is zero for notification messages that do
			/// not use it.
			/// </summary>
			public TVITEM itemOld;

			/// <summary>
			/// TVITEM structure that contains information about the new item state. This member is zero for notification messages that do
			/// not use it.
			/// </summary>
			public TVITEM itemNew;

			/// <summary>
			/// POINT structure that contains the client coordinates of the mouse at the time the event occurred that caused the notification
			/// message to be sent.
			/// </summary>
			public Point ptDrag;
		}

		/// <summary>
		/// Contains an explanation of why the draw of an icon or overlay tree item failed. This structure is sent on a TVN_ASYNCDRAW
		/// notification. Set the dwRetFlags member to indicate what action the control should take. Note that a draw can fail if there is no
		/// image; in other words, when the icon image has not been extracted.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773413")]
		[StructLayout(LayoutKind.Sequential)]
		public struct NMTVASYNCDRAW
		{
			/// <summary>NMHDR structure.</summary>
			public NMHDR hdr;

			/// <summary>IMAGELISTDRAWPARAMS structure describing the image that failed to draw.</summary>
			public IMAGELISTDRAWPARAMS pimldp;

			/// <summary>
			/// Result code indicating why the draw failed, either ILDRF_IMAGELOWQUALITY, ILDRF_OVERLAYLOWQUALITY, E_PENDING, or S_OK. A code
			/// of S_OK indicates that the image is present but not at the required image quality.
			/// </summary>
			public HRESULT hr;

			/// <summary>Handle of the tree item that failed to draw.</summary>
			public HTREEITEM hItem;

			/// <summary>
			/// Data for hItem. This is the same data for the item that is retrieved with the message TVM_GETITEM using the appropriate mask
			/// in structure TVITEM. This data is parent specific; the parent can store information that helps it identify the tree item or
			/// other information. Data is provided in lParam for convenience, so that the parent does not need to send message TVM_GETITEM.
			/// </summary>
			public IntPtr lParam;

			/// <summary>Action that the sender (the tree-view control) should execute on return.</summary>
			public AsyncDrawRetFlags dwRetFlags;

			/// <summary>Index of the image to draw in the image list. Used if ADRF_DRAWIMAGE is returned in dwRetFlags.</summary>
			public int iRetImageIndex;
		}

		/// <summary>Contains information specific to an NM_CUSTOMDRAW (tree view) notification code sent by a tree-view control.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773415")]
		[StructLayout(LayoutKind.Sequential)]
		public struct NMTVCUSTOMDRAW
		{
			/// <summary>NMCUSTOMDRAW structure that contains general custom draw information.</summary>
			public NMCUSTOMDRAW nmcd;

			/// <summary>COLORREF value representing the color that will be used to display text foreground in the tree-view control.</summary>
			public int clrText;

			/// <summary>COLORREF value representing the color that will be used to display text background in the tree-view control.</summary>
			public int clrTextBk;

			/// <summary>
			/// Version 4.71. Zero-based level of the item being drawn. The root item is at level zero, a child of the root item is at level
			/// one, and so on.
			/// </summary>
			public int iLevel;
		}

		/// <summary>
		/// Contains and receives display information for a tree-view item. This structure is identical to the TV_DISPINFO structure, but it
		/// has been renamed to follow current naming conventions.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773418")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct NMTVDISPINFO
		{
			/// <summary>NMHDR structure that contains information about this notification.</summary>
			public NMHDR hdr;

			/// <summary>
			/// TVITEM structure that identifies and contains information about the tree-view item. The mask member of the TVITEM structure
			/// specifies which information is being set or retrieved.
			/// </summary>
			public TVITEM item;
		}

		/// <summary>Contains information pertaining to extended TreeView notification information.</summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb760143")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct NMTVDISPINFOEX
		{
			/// <summary>NMHDR structure that contains information about this notification.</summary>
			public NMHDR hdr;

			/// <summary>Specifies or receives attributes of a TreeView item.</summary>
			public TVITEMEX item;
		}

		/// <summary>
		/// Contains and receives tree-view item information needed to display a tooltip for an item. This structure is used with the
		/// TVN_GETINFOTIP notification code.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773421")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
		public struct NMTVGETINFOTIP
		{
			/// <summary>NMHDR structure that contains information about this notification.</summary>
			public NMHDR hdr;

			/// <summary>
			/// Address of a character buffer that contains the text to be displayed. If you want to change the text displayed in the
			/// tooltip, you will need to modify the contents of this buffer. The size of this buffer is specified by the cchTextMax structure.
			/// </summary>
			public StrPtrAuto pszText;

			/// <summary>
			/// Size of the buffer at pszText, in characters. Although you should never assume that this buffer will be of any particular
			/// size, the INFOTIPSIZE value can be used for design purposes.
			/// </summary>
			public int cchTextMax;

			/// <summary>Tree handle to the item for which the tooltip is being displayed.</summary>
			public HTREEITEM hItem;

			/// <summary>Application-defined data associated with the item for which the tooltip is being displayed.</summary>
			public IntPtr lParam;
		}

		/// <summary>
		/// Contains information on a tree-view item change. This structure is sent with the TVN_ITEMCHANGED and TVN_ITEMCHANGING notifications.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773425")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
		public struct NMTVITEMCHANGE
		{
			/// <summary>NMHDR structure that contains information about the notification.</summary>
			public NMHDR hdr;

			/// <summary>
			/// Specifies the attribute. The only supported attribute is state. uChanged must have the following value: TVIF_STATE = The
			/// change is the state attribute.
			/// </summary>
			public TreeViewItemMask uChanged;

			/// <summary>Handle to the changed tree-view item.</summary>
			public HTREEITEM hItem;

			/// <summary>Flag that specifies the new item state.</summary>
			public TreeViewItemStates uStateNew;

			/// <summary>Flag that specifies the item's previous state.</summary>
			public TreeViewItemStates uStateOld;

			/// <summary>Reserved for application specific data. For example, a value to associate with the item.</summary>
			public IntPtr lParam;
		}

		/// <summary>
		/// Contains information about a keyboard event in a tree-view control. This structure is used with the TVN_KEYDOWN notification
		/// code. The structure is identical to the TV_KEYDOWN structure, but it has been renamed to follow current naming conventions.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773433")]
		[StructLayout(LayoutKind.Sequential)]
		public struct NMTVKEYDOWN
		{
			/// <summary>NMHDR structure that contains information about this notification.</summary>
			public NMHDR hdr;

			/// <summary>Virtual key code.</summary>
			public ushort wVKey;

			/// <summary>Always zero.</summary>
			public uint flags;
		}

		/// <summary>
		/// Contains information used to determine the location of a point relative to a tree-view control. This structure is used with the
		/// TVM_HITTEST message. The structure is identical to the TV_HITTESTINFO structure, but it has been renamed to follow current naming conventions.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773448")]
		[StructLayout(LayoutKind.Sequential)]
		public struct TVHITTESTINFO
		{
			/// <summary>Client coordinates of the point to test.</summary>
			public Point pt;

			/// <summary>Variable that receives information about the results of a hit test.</summary>
			public TreeViewHitTestFlags flags;

			/// <summary>Handle to the item that occupies the point.</summary>
			public HTREEITEM hItem;
		}

		/// <summary>
		/// Contains information used to add a new item to a tree-view control. This structure is used with the TVM_INSERTITEM message. The
		/// structure is identical to the TV_INSERTSTRUCT structure, but it has been renamed to follow current naming conventions.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773452")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct TVINSERTSTRUCT
		{
			/// <summary>
			/// Handle to the parent item. If this member is the TVI_ROOT value or NULL, the item is inserted at the root of the tree-view control.
			/// </summary>
			public HTREEITEM hParent;

			/// <summary>Handle to the item after which the new item is to be inserted, or one of the following values:</summary>
			public HTREEITEM hInsertAfter;

			/// <summary>Version 4.71. TVITEMEX structure that contains information about the item to add.</summary>
			public TVITEMEX itemex;
		}

		/// <summary>
		/// Specifies or receives attributes of a tree-view item. This structure is identical to the TV_ITEM structure, but it has been
		/// renamed to follow current naming conventions. New applications should use this structure.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773456")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct TVITEM
		{
			/// <summary>
			/// Array of flags that indicate which of the other structure members contain valid data. When this structure is used with the
			/// TVM_GETITEM message, the mask member indicates the item attributes to retrieve. If used with the TVM_SETITEM message, the
			/// mask indicates the attributes to set.
			/// </summary>
			public TreeViewItemMask mask;

			/// <summary>Handle to the item.</summary>
			public HTREEITEM hItem;

			/// <summary>
			/// Set of bit flags and image list indexes that indicate the item's state. When setting the state of an item, the stateMask
			/// member indicates the valid bits of this member. When retrieving the state of an item, this member returns the current state
			/// for the bits indicated in the stateMask member.
			/// </summary>
			public uint state;

			/// <summary>
			/// Bits of the state member that are valid. If you are retrieving an item's state, set the bits of the stateMask member to
			/// indicate the bits to be returned in the state member. If you are setting an item's state, set the bits of the stateMask
			/// member to indicate the bits of the state member that you want to set. To set or retrieve an item's overlay image index, set
			/// the TVIS_OVERLAYMASK bits. To set or retrieve an item's state image index, set the TVIS_STATEIMAGEMASK bits.
			/// </summary>
			public TreeViewItemStates stateMask;

			/// <summary>
			/// Pointer to a null-terminated string that contains the item text if the structure specifies item attributes. If this member is
			/// the LPSTR_TEXTCALLBACK value, the parent window is responsible for storing the name. In this case, the tree-view control
			/// sends the parent window a TVN_GETDISPINFO notification code when it needs the item text for displaying, sorting, or editing
			/// and a TVN_SETDISPINFO notification code when the item text changes. If the structure is receiving item attributes, this
			/// member is the address of the buffer that receives the item text. Note that although the tree-view control allows any length
			/// string to be stored as item text, only the first 260 characters are displayed.
			/// </summary>
			public IntPtr pszText;

			/// <summary>
			/// Size of the buffer pointed to by the pszText member, in characters. If this structure is being used to set item attributes,
			/// this member is ignored.
			/// </summary>
			public int cchTextMax;

			/// <summary>
			/// Index in the tree-view control's image list of the icon image to use when the item is in the nonselected state. If this
			/// member is the I_IMAGECALLBACK value, the parent window is responsible for storing the index. In this case, the tree-view
			/// control sends the parent a TVN_GETDISPINFO notification code to retrieve the index when it needs to display the image.
			/// </summary>
			public int iImage;

			/// <summary>
			/// Index in the tree-view control's image list of the icon image to use when the item is in the selected state. If this member
			/// is the I_IMAGECALLBACK value, the parent window is responsible for storing the index. In this case, the tree-view control
			/// sends the parent a TVN_GETDISPINFO notification code to retrieve the index when it needs to display the image.
			/// </summary>
			public int iSelectedImage;

			/// <summary>
			/// Flag that indicates whether the item has associated child items. This member can be one of the following values.
			/// <list type="table">
			/// <listheader>
			/// <term>Value</term>
			/// <term>Meaning</term>
			/// </listheader>
			/// <item>
			/// <term>zero</term>
			/// <description>The item has no child items.</description>
			/// </item>
			/// <item>
			/// <term>one</term>
			/// <description>The item has one or more child items.</description>
			/// </item>
			/// <item>
			/// <term>I_CHILDRENCALLBACK</term>
			/// <description>
			/// The parent window keeps track of whether the item has child items.In this case, when the tree-view control needs to display
			/// the item, the control sends the parent a TVN_GETDISPINFO notification code to determine whether the item has child items.
			/// <para>
			/// If the tree-view control has the TVS_HASBUTTONS style, it uses this member to determine whether to display the button
			/// indicating the presence of child items. You can use this member to force the control to display the button even though the
			/// item does not have any child items inserted. This allows you to display the button while minimizing the control's memory
			/// usage by inserting child items only when the item is visible or expanded.
			/// </para>
			/// </description>
			/// </item>
			/// <item>
			/// <term>I_CHILDRENAUTO</term>
			/// <description>
			/// Version 6.0 Intended for internal use; not recommended for use in applications.The tree-view control automatically determines
			/// whether the item has child items. <note>This flag may not be supported in future versions of Comctl32.dll.Also, this flag is
			/// not defined in commctrl.h.Add the following definition to the source files of your application to use the flag:</note>
			/// <code>
			/// #define I_CHILDRENAUTO (-2)
			/// </code>
			/// </description>
			/// </item>
			/// </list>
			/// </summary>
			public int cChildren;

			/// <summary>A value to associate with the item.</summary>
			public IntPtr lParam;

			/// <summary>Gets or sets a value indicating whether this <see cref="TVITEM"/> is bold.</summary>
			/// <value><c>true</c> if bold; otherwise, <c>false</c>.</value>
			public bool Bold
			{
				get => GetState(TreeViewItemStates.TVIS_BOLD); set => SetState(TreeViewItemStates.TVIS_BOLD, value);
			}

			/// <summary>Gets or sets a value indicating whether this <see cref="TVITEM"/> is expanded.</summary>
			/// <value><c>true</c> if expanded; otherwise, <c>false</c>.</value>
			public bool Expanded
			{
				get => GetState(TreeViewItemStates.TVIS_EXPANDED); set => SetState(TreeViewItemStates.TVIS_EXPANDED, value);
			}

			/// <summary>Gets or sets a value indicating whether child items have been expanded at least once.</summary>
			/// <value><c>true</c> if child items have been expanded at least once; otherwise, <c>false</c>.</value>
			public bool ExpandedOnce
			{
				get => GetState(TreeViewItemStates.TVIS_EXPANDEDONCE); set => SetState(TreeViewItemStates.TVIS_EXPANDEDONCE, value);
			}

			/// <summary>Gets or sets a value indicating whether item is partially expanded.</summary>
			/// <value><c>true</c> if partially expanded; otherwise, <c>false</c>.</value>
			public bool ExpandedPartial
			{
				get => GetState(TreeViewItemStates.TVIS_EXPANDPARTIAL); set => SetState(TreeViewItemStates.TVIS_EXPANDPARTIAL, value);
			}

			/// <summary>Gets or sets the index of the overlay image.</summary>
			/// <value>The index of the overlay image.</value>
			/// <exception cref="ArgumentOutOfRangeException">OverlayImageIndex - Overlay image index must be between 0 and 15</exception>
			public uint OverlayImageIndex
			{
				get => (state & 0x00000F00) >> 8; set
				{
					if (value > 15)
						throw new ArgumentOutOfRangeException(nameof(OverlayImageIndex), "Overlay image index must be between 0 and 15");
					mask |= TreeViewItemMask.TVIF_STATE;
					stateMask |= TreeViewItemStates.TVIS_OVERLAYMASK;
					state = (value << 8) | (state & 0xFFFFF0FF);
				}
			}

			/// <summary>Gets or sets a value indicating whether this <see cref="TVITEM"/> is selected.</summary>
			/// <value><c>true</c> if selected; otherwise, <c>false</c>.</value>
			public bool Selected
			{
				get => GetState(TreeViewItemStates.TVIS_SELECTED); set => SetState(TreeViewItemStates.TVIS_SELECTED, value);
			}

			/// <summary>Gets or sets a value indicating whether item is selected as part of a cut-and-paste operation.</summary>
			/// <value><c>true</c> if item is selected as part of a cut-and-paste operation; otherwise, <c>false</c>.</value>
			public bool SelectedForCut
			{
				get => GetState(TreeViewItemStates.TVIS_CUT); set => SetState(TreeViewItemStates.TVIS_CUT, value);
			}

			/// <summary>Gets or sets a value indicating whether item is selected as a drag-and-drop target.</summary>
			/// <value><c>true</c> if item is selected as a drag-and-drop target; otherwise, <c>false</c>.</value>
			public bool SelectedForDragDrop
			{
				get => GetState(TreeViewItemStates.TVIS_DROPHILITED); set => SetState(TreeViewItemStates.TVIS_DROPHILITED, value);
			}

			/// <summary>Gets the state.</summary>
			/// <value>The state.</value>
			public TreeViewItemStates State => (TreeViewItemStates)(state & 0x000000FF);

			/// <summary>Gets or sets the index of the state image.</summary>
			/// <value>The index of the state image.</value>
			/// <exception cref="ArgumentOutOfRangeException">StateImageIndex - State image index must be between 0 and 15</exception>
			public uint StateImageIndex
			{
				get => (state & 0x0000F000) >> 12; set
				{
					if (value > 15)
						throw new ArgumentOutOfRangeException(nameof(StateImageIndex), "State image index must be between 0 and 15");
					mask |= TreeViewItemMask.TVIF_STATE;
					stateMask |= TreeViewItemStates.TVIS_STATEIMAGEMASK;
					state = (value << 12) | (state & 0xFFFF0FFF);
				}
			}

			/// <summary>Gets the text.</summary>
			/// <value>The text.</value>
			public string Text => pszText == LPSTR_TEXTCALLBACK ? null : Marshal.PtrToStringUni(pszText);

			/// <summary>Gets or sets a value indicating whether to use text callback.</summary>
			/// <value><c>true</c> if to use text callback; otherwise, <c>false</c>.</value>
			public bool UseTextCallback
			{
				get => pszText == LPSTR_TEXTCALLBACK;
				set
				{
					if (value)
						pszText = LPSTR_TEXTCALLBACK;
					mask |= TreeViewItemMask.TVIF_TEXT;
				}
			}

			/// <summary>Gets a value on whether the specified state is set.</summary>
			/// <param name="itemState">State of the item.</param>
			/// <returns><c>true</c> if the specified state is set; otherwise, <c>false</c>.</returns>
			public bool GetState(TreeViewItemStates itemState) => State.IsFlagSet(itemState);

			/// <summary>Sets the state of the specified state.</summary>
			/// <param name="itemState">State of the item.</param>
			/// <param name="on">if set to <c>true</c> set this state on.</param>
			public void SetState(TreeViewItemStates itemState, bool on = true)
			{
				mask |= TreeViewItemMask.TVIF_STATE;
				stateMask |= itemState;
				var tempState = State;
				EnumExtensions.SetFlags(ref tempState, itemState, on);
				state = (uint)tempState | (state & 0xFFFFFF00);
			}

			/// <summary>Sets the text.</summary>
			/// <param name="managedStringPtr">The managed string PTR.</param>
			/// <param name="stringLen">Length of the string.</param>
			public void SetText(IntPtr managedStringPtr, int stringLen)
			{
				pszText = managedStringPtr;
				cchTextMax = stringLen;
				mask |= TreeViewItemMask.TVIF_TEXT;
			}

			/// <summary>Returns a <see cref="System.String"/> that represents this instance.</summary>
			/// <returns>A <see cref="System.String"/> that represents this instance.</returns>
			public override string ToString() => $"TVITEM: pszText={Text}; iImage={iImage}; iSelectedImage={iSelectedImage}; state={state}; cChildren={cChildren}";
		}

		/// <summary>
		/// Specifies or receives attributes of a tree-view item. This structure is an enhancement to the TVITEM structure. New applications
		/// should use this structure where appropriate.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773459")]
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct TVITEMEX
		{
			/// <summary>
			/// Array of flags that indicate which of the other structure members contain valid data. When this structure is used with the
			/// TVM_GETITEM message, the mask member indicates the item attributes to retrieve. If used with the TVM_SETITEM message, the
			/// mask indicates the attributes to set.
			/// </summary>
			public TreeViewItemMask mask;

			/// <summary>Handle to the item.</summary>
			public HTREEITEM hItem;

			/// <summary>
			/// Set of bit flags and image list indexes that indicate the item's state. When setting the state of an item, the stateMask
			/// member indicates the valid bits of this member. When retrieving the state of an item, this member returns the current state
			/// for the bits indicated in the stateMask member.
			/// </summary>
			public uint state;

			/// <summary>
			/// Bits of the state member that are valid. If you are retrieving an item's state, set the bits of the stateMask member to
			/// indicate the bits to be returned in the state member. If you are setting an item's state, set the bits of the stateMask
			/// member to indicate the bits of the state member that you want to set. To set or retrieve an item's overlay image index, set
			/// the TVIS_OVERLAYMASK bits. To set or retrieve an item's state image index, set the TVIS_STATEIMAGEMASK bits.
			/// </summary>
			public TreeViewItemStates stateMask;

			/// <summary>
			/// Pointer to a null-terminated string that contains the item text if the structure specifies item attributes. If this member is
			/// the LPSTR_TEXTCALLBACK value, the parent window is responsible for storing the name. In this case, the tree-view control
			/// sends the parent window a TVN_GETDISPINFO notification code when it needs the item text for displaying, sorting, or editing
			/// and a TVN_SETDISPINFO notification code when the item text changes. If the structure is receiving item attributes, this
			/// member is the address of the buffer that receives the item text. Note that although the tree-view control allows any length
			/// string to be stored as item text, only the first 260 characters are displayed.
			/// </summary>
			public StrPtrAuto pszText;

			/// <summary>
			/// Size of the buffer pointed to by the pszText member, in characters. If this structure is being used to set item attributes,
			/// this member is ignored.
			/// </summary>
			public int cchTextMax;

			/// <summary>
			/// Index in the tree-view control's image list of the icon image to use when the item is in the nonselected state. If this
			/// member is the I_IMAGECALLBACK value, the parent window is responsible for storing the index. In this case, the tree-view
			/// control sends the parent a TVN_GETDISPINFO notification code to retrieve the index when it needs to display the image.
			/// </summary>
			public int iImage;

			/// <summary>
			/// Index in the tree-view control's image list of the icon image to use when the item is in the selected state. If this member
			/// is the I_IMAGECALLBACK value, the parent window is responsible for storing the index. In this case, the tree-view control
			/// sends the parent a TVN_GETDISPINFO notification code to retrieve the index when it needs to display the image.
			/// </summary>
			public int iSelectedImage;

			/// <summary>
			/// Flag that indicates whether the item has associated child items. This member can be one of the following values.
			/// <list type="table">
			/// <listheader>
			/// <term>Value</term>
			/// <term>Meaning</term>
			/// </listheader>
			/// <item>
			/// <term>zero</term>
			/// <description>The item has no child items.</description>
			/// </item>
			/// <item>
			/// <term>one</term>
			/// <description>The item has one or more child items.</description>
			/// </item>
			/// <item>
			/// <term>I_CHILDRENCALLBACK</term>
			/// <description>
			/// The parent window keeps track of whether the item has child items.In this case, when the tree-view control needs to display
			/// the item, the control sends the parent a TVN_GETDISPINFO notification code to determine whether the item has child items.
			/// <para>
			/// If the tree-view control has the TVS_HASBUTTONS style, it uses this member to determine whether to display the button
			/// indicating the presence of child items. You can use this member to force the control to display the button even though the
			/// item does not have any child items inserted. This allows you to display the button while minimizing the control's memory
			/// usage by inserting child items only when the item is visible or expanded.
			/// </para>
			/// </description>
			/// </item>
			/// <item>
			/// <term>I_CHILDRENAUTO</term>
			/// <description>
			/// Version 6.0 Intended for internal use; not recommended for use in applications.The tree-view control automatically determines
			/// whether the item has child items. <note>This flag may not be supported in future versions of Comctl32.dll.Also, this flag is
			/// not defined in commctrl.h.Add the following definition to the source files of your application to use the flag:</note>
			/// <code>
			/// #define I_CHILDRENAUTO (-2)
			/// </code>
			/// </description>
			/// </item>
			/// </list>
			/// </summary>
			public int cChildren;

			/// <summary>A value to associate with the item.</summary>
			public IntPtr lParam;

			/// <summary>The i integral</summary>
			public int iIntegral;

			/// <summary>The u state ex</summary>
			public TreeViewItemStatesEx uStateEx;

			/// <summary>The HWND</summary>
			public HWND hwnd;

			/// <summary>The i expanded image</summary>
			public int iExpandedImage;

			/// <summary>The i reserved</summary>
			public int iReserved;

			/// <summary>Gets or sets a value indicating whether this <see cref="TVITEM"/> is bold.</summary>
			/// <value><c>true</c> if bold; otherwise, <c>false</c>.</value>
			public bool Bold
			{
				get => GetState(TreeViewItemStates.TVIS_BOLD); set => SetState(TreeViewItemStates.TVIS_BOLD, value);
			}

			/// <summary>Gets or sets a value indicating whether this <see cref="TVITEM"/> is expanded.</summary>
			/// <value><c>true</c> if expanded; otherwise, <c>false</c>.</value>
			public bool Expanded
			{
				get => GetState(TreeViewItemStates.TVIS_EXPANDED); set => SetState(TreeViewItemStates.TVIS_EXPANDED, value);
			}

			/// <summary>Gets or sets a value indicating whether child items have been expanded at least once.</summary>
			/// <value><c>true</c> if child items have been expanded at least once; otherwise, <c>false</c>.</value>
			public bool ExpandedOnce
			{
				get => GetState(TreeViewItemStates.TVIS_EXPANDEDONCE); set => SetState(TreeViewItemStates.TVIS_EXPANDEDONCE, value);
			}

			/// <summary>Gets or sets a value indicating whether item is partially expanded.</summary>
			/// <value><c>true</c> if partially expanded; otherwise, <c>false</c>.</value>
			public bool ExpandedPartial
			{
				get => GetState(TreeViewItemStates.TVIS_EXPANDPARTIAL); set => SetState(TreeViewItemStates.TVIS_EXPANDPARTIAL, value);
			}

			/// <summary>Gets or sets the index of the overlay image.</summary>
			/// <value>The index of the overlay image.</value>
			/// <exception cref="ArgumentOutOfRangeException">OverlayImageIndex - Overlay image index must be between 0 and 15</exception>
			public uint OverlayImageIndex
			{
				get => (state & 0x00000F00) >> 8; set
				{
					if (value > 15)
						throw new ArgumentOutOfRangeException(nameof(OverlayImageIndex), "Overlay image index must be between 0 and 15");
					mask |= TreeViewItemMask.TVIF_STATE;
					stateMask |= TreeViewItemStates.TVIS_OVERLAYMASK;
					state = (value << 8) | (state & 0xFFFFF0FF);
				}
			}

			/// <summary>Gets or sets a value indicating whether this <see cref="TVITEM"/> is selected.</summary>
			/// <value><c>true</c> if selected; otherwise, <c>false</c>.</value>
			public bool Selected
			{
				get => GetState(TreeViewItemStates.TVIS_SELECTED); set => SetState(TreeViewItemStates.TVIS_SELECTED, value);
			}

			/// <summary>Gets or sets a value indicating whether item is selected as part of a cut-and-paste operation.</summary>
			/// <value><c>true</c> if item is selected as part of a cut-and-paste operation; otherwise, <c>false</c>.</value>
			public bool SelectedForCut
			{
				get => GetState(TreeViewItemStates.TVIS_CUT); set => SetState(TreeViewItemStates.TVIS_CUT, value);
			}

			/// <summary>Gets or sets a value indicating whether item is selected as a drag-and-drop target.</summary>
			/// <value><c>true</c> if item is selected as a drag-and-drop target; otherwise, <c>false</c>.</value>
			public bool SelectedForDragDrop
			{
				get => GetState(TreeViewItemStates.TVIS_DROPHILITED);
				set => SetState(TreeViewItemStates.TVIS_DROPHILITED, value);
			}

			/// <summary>Gets the state.</summary>
			/// <value>The state.</value>
			public TreeViewItemStates State => (TreeViewItemStates)(state & 0x000000FF);

			/// <summary>Gets or sets the index of the state image.</summary>
			/// <value>The index of the state image.</value>
			/// <exception cref="ArgumentOutOfRangeException">StateImageIndex - State image index must be between 0 and 15</exception>
			public uint StateImageIndex
			{
				get => (state & 0x0000F000) >> 12; set
				{
					if (value > 15)
						throw new ArgumentOutOfRangeException(nameof(StateImageIndex), "State image index must be between 0 and 15");
					mask |= TreeViewItemMask.TVIF_STATE;
					stateMask |= TreeViewItemStates.TVIS_STATEIMAGEMASK;
					state = (value << 12) | (state & 0xFFFF0FFF);
				}
			}

			/// <summary>Gets the text.</summary>
			/// <value>The text.</value>
			public string Text => (IntPtr)pszText == LPSTR_TEXTCALLBACK ? null : pszText.ToString();

			/// <summary>Gets or sets a value indicating whether to use text callback.</summary>
			/// <value><c>true</c> if to use text callback; otherwise, <c>false</c>.</value>
			public bool UseTextCallback
			{
				get => (IntPtr)pszText == LPSTR_TEXTCALLBACK;
				set
				{
					if (value)
						pszText.AssignConstant(-1);
					mask |= TreeViewItemMask.TVIF_TEXT;
				}
			}

			/// <summary>Gets a value on whether the specified state is set.</summary>
			/// <param name="itemState">State of the item.</param>
			/// <returns><c>true</c> if the specified state is set; otherwise, <c>false</c>.</returns>
			public bool GetState(TreeViewItemStates itemState) => State.IsFlagSet(itemState);

			/// <summary>Sets the state of the specified state.</summary>
			/// <param name="itemState">State of the item.</param>
			/// <param name="on">if set to <c>true</c> set this state on.</param>
			public void SetState(TreeViewItemStates itemState, bool on = true)
			{
				mask |= TreeViewItemMask.TVIF_STATE;
				stateMask |= itemState;
				var tempState = State;
				EnumExtensions.SetFlags(ref tempState, itemState, on);
				state = (uint)tempState | (state & 0xFFFFFF00);
			}

			/// <summary>Sets the text.</summary>
			/// <param name="managedStringPtr">The managed string PTR.</param>
			/// <param name="stringLen">Length of the string.</param>
			public void SetText(IntPtr managedStringPtr, int stringLen)
			{
				pszText.Assign(managedStringPtr);
				cchTextMax = stringLen;
				mask |= TreeViewItemMask.TVIF_TEXT;
			}

			/// <summary>Returns a <see cref="string"/> that represents this instance.</summary>
			/// <returns>A <see cref="string"/> that represents this instance.</returns>
			public override string ToString() => $"TVITEM: pszText={Text}; iImage={iImage}; iSelectedImage={iSelectedImage}; state={state}; iExpandedImage={iExpandedImage}; iIntegral={iIntegral}; cChildren={cChildren}";
		}

		/// <summary>
		/// Contains information used to sort child items in a tree-view control. This structure is used with the TVM_SORTCHILDRENCB message.
		/// This structure is identical to the TV_SORTCB structure, but it has been renamed to follow current naming conventions.
		/// </summary>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773462")]
		[StructLayout(LayoutKind.Sequential)]
		public struct TVSORTCB
		{
			/// <summary>Handle to the parent item.</summary>
			public HTREEITEM hParent;

			/// <summary>
			/// Address of an application-defined callback function, which is called during a sort operation each time the relative order of
			/// two list items needs to be compared.
			/// </summary>
			public PFNTVCOMPARE lpfnCompare;

			/// <summary>
			/// Application-defined value that gets passed as the lParamSort argument in the callback function specified in lpfnCompare.
			/// </summary>
			public IntPtr lParam;
		}

		/// <summary>
		/// Contains information for identifying the "hit zone" for a specified part of a tree item. The structure is used with the
		/// TVM_GETITEMPARTRECT message and the TreeView_GetItemPartRect macro.
		/// </summary>
		/// <seealso cref="System.IDisposable"/>
		[PInvokeData("Commctrl.h", MSDNShortId = "bb773442")]
		[StructLayout(LayoutKind.Sequential)]
		public sealed class TVGETITEMPARTRECTINFO : IDisposable
		{
			/// <summary>Handle to the parent item.</summary>
			public HTREEITEM hti;

			/// <summary>
			/// Pointer to a RECT structure to receive the coordinates of the bounding rectangle. The sender of the message (the caller) is
			/// responsible for allocating this structure.
			/// </summary>
			public IntPtr prc;

			/// <summary>ID of the item part. This value must be TVGIPR_BUTTON (0x0001).</summary>
			public TVITEMPART partID;

			/// <summary>Initializes a new instance of the <see cref="TVGETITEMPARTRECTINFO"/> class.</summary>
			/// <param name="hTreeNode">The h tree node.</param>
			public TVGETITEMPARTRECTINFO(HTREEITEM hTreeNode)
			{
				hti = hTreeNode;
				prc = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(RECT)));
				partID = TVITEMPART.TVGIPR_BUTTON;
			}

			/// <summary>Gets the bounds.</summary>
			/// <value>The bounds.</value>
			public Rectangle Bounds => prc.ToStructure<RECT>();

			/// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
			void IDisposable.Dispose() => Marshal.FreeCoTaskMem(prc);
		}
	}
}