Custom ComboBoxes with Advanced Drop-down Features

Oleksandr Kucherenko

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22 Apr 2003CPOL4 min read

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Contains several ComboBoxes which uses Windows themes and contains ComboBoxes with CheckBoxed lists and TreeViews

customcombos_demo.zip
- CustomControlDemo
  - App.ico
  - AssemblyInfo.cs
  - bin
    - Debug
      - CustomControlDemo.exe
      - CustomControls.dll
    - Release
      - CustomControlDemo.exe
      - CustomControls.dll
  - CustomControlDemo.csproj
  - CustomControlDemo.csproj.user
  - CustomControlDemo.suo
  - Form1.cs
  - Form1.resx
- CustomControls
  - bin
    - Debug
      - CustomControls.dll
    - Release
      - CustomControls.dll
  - CalendarViewEx.cs
  - CalendarViewEx.resx
  - CheckCombo.cs
  - checkcombo.resx
  - ColorUtil.cs
  - CustomComboBox.cs
  - CustomComboBox.resx
  - CustomControls.csproj
  - CustomControls.csproj.user
  - CustomControls.sln
  - CustomControls.suo
  - DateCombo.cs
  - datecombo.resx
  - Enumerations.cs
  - Enums.cs
  - FlagsEditor.cs
  - Functions.cs
  - GDIUtil.cs
  - GDIUtilities.cs
  - RegistryUtil.cs
  - ResourceUtil.cs
  - Structs.cs
  - TextUtil.cs
  - TreeCombo.cs
  - treecombo.resx

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace UtilityLibrary.Win32
{
	/// <summary>
	/// Windows API Functions
	/// </summary>
	public class WindowsAPI
	{
		#region Constructors
		// No need to construct this object
		private WindowsAPI()
		{
		}
		#endregion
		
		#region Constans values
		public const string TOOLBARCLASSNAME = "ToolbarWindow32";
		public const string REBARCLASSNAME = "ReBarWindow32";
		public const string PROGRESSBARCLASSNAME = "msctls_progress32";
		public const string SCROLLBAR = "SCROLLBAR";
		#endregion

		#region CallBacks
		public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
		#endregion

		#region Kernel32.dll functions
		[DllImport("kernel32.dll", ExactSpelling=true, CharSet=CharSet.Auto)]
		public static extern int GetCurrentThreadId();
		[DllImport("kernel32.dll", ExactSpelling=true, CharSet=CharSet.Auto)]
		public static extern int GetLastError();
		[DllImport("kernel32.dll", ExactSpelling=true, CharSet=CharSet.Auto)]
		public static extern void SetLastError( int error );
		#endregion
	
		#region Gdi32.dll functions
		[DllImport("gdi32.dll")]
		static public extern bool StretchBlt(IntPtr hDCDest, int XOriginDest, int YOriginDest, int WidthDest, int HeightDest,
			IntPtr hDCSrc,  int XOriginScr, int YOriginSrc, int WidthScr, int HeightScr, uint Rop);
		[DllImport("gdi32.dll")]
		static public extern IntPtr CreateCompatibleDC(IntPtr hDC);
		[DllImport("gdi32.dll")]
		static public extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int Width, int Heigth);
		[DllImport("gdi32.dll")]
		static public extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
		[DllImport("gdi32.dll")]
		static public extern bool BitBlt(IntPtr hDCDest, int XOriginDest, int YOriginDest, int WidthDest, int HeightDest,
			IntPtr hDCSrc,  int XOriginScr, int YOriginSrc, uint Rop);
		[DllImport("gdi32.dll")]
		static public extern IntPtr DeleteDC(IntPtr hDC);
		[DllImport("gdi32.dll")]
		static public extern bool PatBlt(IntPtr hDC, int XLeft, int YLeft, int Width, int Height, uint Rop);
		[DllImport("gdi32.dll")]
		static public extern bool DeleteObject(IntPtr hObject);
		[DllImport("gdi32.dll")]
		static public extern uint GetPixel(IntPtr hDC, int XPos, int YPos);
		[DllImport("gdi32.dll")]
		static public extern int SetMapMode(IntPtr hDC, int fnMapMode);
		[DllImport("gdi32.dll")]
		static public extern int GetObjectType(IntPtr handle);
		[DllImport("gdi32")]
		public static extern IntPtr CreateDIBSection(IntPtr hdc, ref BITMAPINFO_FLAT bmi, 
			int iUsage, ref int ppvBits, IntPtr hSection, int dwOffset);
		[DllImport("gdi32")]
		public static extern int GetDIBits(IntPtr hDC, IntPtr hbm, int StartScan, int ScanLines, int lpBits, BITMAPINFOHEADER bmi, int usage);
		[DllImport("gdi32")]
		public static extern int GetDIBits(IntPtr hdc, IntPtr hbm, int StartScan, int ScanLines, int lpBits, ref BITMAPINFO_FLAT bmi, int usage);
		[DllImport("gdi32")]
		public static extern IntPtr GetPaletteEntries(IntPtr hpal, int iStartIndex, int nEntries, byte[] lppe);
		[DllImport("gdi32")]
		public static extern IntPtr GetSystemPaletteEntries(IntPtr hdc, int iStartIndex, int nEntries, byte[] lppe);
		[DllImport("gdi32")]
		public static extern uint SetDCBrushColor(IntPtr hdc,  uint crColor);
		[DllImport("gdi32")]
		public static extern IntPtr CreateSolidBrush(uint crColor);
		[DllImport("gdi32")]
		public static extern int SetBkMode(IntPtr hDC, BackgroundMode mode);
		[DllImport("gdi32")]
		public static extern int SetViewportOrgEx(IntPtr hdc,  int x, int y,  int param);
		[DllImport("gdi32")]
        public static extern uint SetTextColor(IntPtr hDC, uint colorRef);
		[DllImport("gdi32")]
		public static extern int SetStretchBltMode(IntPtr hDC, int StrechMode);
		#endregion

		#region Uxtheme.dll functions
		[DllImport("uxtheme.dll")]
		static public extern int SetWindowTheme(IntPtr hWnd, string AppID, string ClassID);
		#endregion
	
		#region User32.dll functions
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern IntPtr GetDC(IntPtr hWnd);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern IntPtr GetDesktopWindow();
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool ShowWindow(IntPtr hWnd, short State);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool UpdateWindow(IntPtr hWnd);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool SetForegroundWindow(IntPtr hWnd);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int Width, int Height, uint flags);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool OpenClipboard(IntPtr hWndNewOwner);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool CloseClipboard();
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool EmptyClipboard();
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern IntPtr SetClipboardData( uint Format, IntPtr hData);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern bool GetMenuItemRect(IntPtr hWnd, IntPtr hMenu, uint Item, ref RECT rc);
		[DllImport("user32.dll", ExactSpelling=true, CharSet=CharSet.Auto)]
		public static extern IntPtr GetParent(IntPtr hWnd);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    public static extern int SendMessage(IntPtr hWnd, SpinControlMsg msg, int wParam, ref UDACCEL lParam );
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref RECT lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref POINT lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref TBBUTTON lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref TBBUTTONINFO lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref REBARBANDINFO lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref TVITEM lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref LVITEM lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref HDITEM lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref HD_HITTESTINFO hti);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref PARAFORMAT2 format);
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    static public extern int SendDlgItemMessage( IntPtr hWnd, int Id, int msg, int wParam, int lParam );
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr PostMessage(IntPtr hWnd, int msg, int wParam, int lParam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr SetWindowsHookEx(int hookid, HookProc pfnhook, IntPtr hinst, int threadid);
		[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
		public static extern bool UnhookWindowsHookEx(IntPtr hhook);
		[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
		public static extern IntPtr CallNextHookEx(IntPtr hhook, int code, IntPtr wparam, IntPtr lparam);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr SetFocus(IntPtr hWnd);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public extern static int DrawText(IntPtr hdc, string lpString, int nCount, ref RECT lpRect, int uFormat);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public extern static IntPtr SetParent(IntPtr hChild, IntPtr hParent);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public extern static IntPtr GetDlgItem(IntPtr hDlg, int nControlID);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		public extern static int GetClientRect(IntPtr hWnd, ref RECT rc);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
    public extern static int InvalidateRect(IntPtr hWnd,  IntPtr rect, int bErase);
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    public extern static int InvalidateRect(IntPtr hWnd,  ref RECT rect, int bErase);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool WaitMessage();
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool PeekMessage(ref MSG msg, int hWnd, uint wFilterMin, uint wFilterMax, uint wFlag);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool GetMessage(ref MSG msg, int hWnd, uint wFilterMin, uint wFilterMax);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool TranslateMessage(ref MSG msg);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool DispatchMessage(ref MSG msg);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr LoadCursor(IntPtr hInstance, uint cursor);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr SetCursor(IntPtr hCursor);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr GetFocus();
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool ReleaseCapture();
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr BeginPaint(IntPtr hWnd, ref PAINTSTRUCT ps);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT ps);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref POINT pptDst, ref SIZE psize, IntPtr hdcSrc, ref POINT pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool GetWindowRect(IntPtr hWnd, ref RECT rect);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool ClientToScreen(IntPtr hWnd, ref POINT pt);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool TrackMouseEvent(ref TRACKMOUSEEVENTS tme);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool redraw);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern ushort GetKeyState(int virtKey);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern bool MoveWindow(IntPtr hWnd, int x, int y, int width, int height, bool repaint);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern int GetClassName(IntPtr hWnd,  out STRINGBUFFER ClassName, int nMaxCount);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
    [DllImport("User32.dll", CharSet=CharSet.Auto)]
    public static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
    [DllImport("User32.dll", CharSet=CharSet.Auto)]
    public static extern System.Int32 GetWindowLong( IntPtr hWnd, int nIndex );
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr GetDCEx(IntPtr hWnd, IntPtr hRegion, uint flags);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern IntPtr GetWindowDC(IntPtr hWnd);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern int FillRect(IntPtr hDC, ref RECT rect, IntPtr hBrush);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern int GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT wp);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern int SetWindowText(IntPtr hWnd, string text);
		[DllImport("User32.dll", CharSet=CharSet.Auto)]
		public static extern int GetWindowText(IntPtr hWnd, out STRINGBUFFER text, int maxCount);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); 
		[DllImport("user32.dll", CharSet=CharSet.Auto)] 
		static public extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer); 
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int GetSystemMetrics(int nIndex);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int SetScrollInfo(IntPtr hwnd,  int bar, ref SCROLLINFO si, int fRedraw);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int ShowScrollBar(IntPtr hWnd, int bar,  int show);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int EnableScrollBar(IntPtr hWnd, uint flags, uint arrows);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int BringWindowToTop(IntPtr hWnd);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int GetScrollInfo(IntPtr hwnd, int bar, ref SCROLLINFO si);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int ScrollWindowEx(IntPtr hWnd, int dx, int dy, 
			ref RECT rcScroll, ref RECT rcClip, IntPtr UpdateRegion, ref RECT rcInvalidated, uint flags);
		[DllImport("user32.dll", CharSet=CharSet.Auto)]
		static public extern int IsWindow(IntPtr hWnd);
		[DllImport("shell32.Dll", CharSet=CharSet.Auto)]
		static public extern int Shell_NotifyIcon( NotifyCommand cmd, ref NOTIFYICONDATA data );
		[DllImport("User32.Dll", CharSet=CharSet.Auto)]
		static public extern int TrackPopupMenuEx( IntPtr hMenu, uint uFlags, int x, 
      int y, IntPtr hWnd, IntPtr ignore );
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    static public extern int GetCursorPos( ref POINT pnt );
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    static public extern int GetCaretPos( ref POINT pnt );
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    static public extern int ValidateRect( IntPtr hWnd, ref RECT rc );
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    static public extern IntPtr FindWindowEx( IntPtr hWnd, IntPtr hChild, string strClassName, string strName );
    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    static public extern IntPtr FindWindowEx( IntPtr hWnd, IntPtr hChild, string strClassName, IntPtr strName );
		#endregion

		#region Common Controls functions
		[DllImport("comctl32.dll")]
		public static extern bool InitCommonControlsEx(INITCOMMONCONTROLSEX icc);
		[DllImport("comctl32.dll")]
		public static extern bool InitCommonControls();
		[DllImport("comctl32.dll", EntryPoint="DllGetVersion")]
		public extern static int GetCommonControlDLLVersion(ref DLLVERSIONINFO dvi);
		[DllImport("comctl32.dll")]
		public static extern IntPtr ImageList_Create(int width, int height, uint flags, int count, int grow);
		[DllImport("comctl32.dll")]
		public static extern bool ImageList_Destroy(IntPtr handle);
		[DllImport("comctl32.dll")]
		public static extern int ImageList_Add(IntPtr imageHandle, IntPtr hBitmap, IntPtr hMask);
		[DllImport("comctl32.dll")]
		public static extern bool ImageList_Remove(IntPtr imageHandle, int index);
		[DllImport("comctl32.dll")]
		public static extern bool ImageList_BeginDrag(IntPtr imageHandle, int imageIndex, int xHotSpot, int yHotSpot);
		[DllImport("comctl32.dll")]
		public static extern bool ImageList_DragEnter(IntPtr hWndLock, int x, int y);
		[DllImport("comctl32.dll")]
		public static extern bool ImageList_DragMove(int x, int y);
		[DllImport("comctl32.dll")]
		public static extern bool ImageList_DragLeave(IntPtr hWndLock);
		[DllImport("comctl32.dll")]
		public static extern void ImageList_EndDrag();
		#endregion

		#region Win32 Macro-Like helpers
		public static int GET_X_LPARAM(int lParam)
		{
			return (lParam & 0xffff);
		}
	 

		public static int GET_Y_LPARAM(int lParam)
		{
			return (lParam >> 16);
		}

		public static Point GetPointFromLPARAM(int lParam)
		{
			return new Point(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
		}

		public static int LOW_ORDER(int param)
		{
			return (param & 0xffff);
		}

		public static int HIGH_ORDER(int param)
		{
			return (param >> 16);
		}

		#endregion
	}
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

Oleksandr Kucherenko

CEO ArtfulBits Inc.

Ukraine

Name:Kucherenko Oleksandr

Born:September 20, 1979

Platforms: Win32, Linux; - well known and MS-DOS; Win16; OS/2 - old time not touched;

Hardware: IBM PC

Programming Languages: Assembler (for Intel 80386); Borland C/C++; Borland Pascal; Object Pascal; Borland C++Builder; Delphi; Perl; Java; Visual C++; Visual J++; UML; XML/XSL; C#; VB.NET; T-SQL; PL/SQL; and etc.

Development Environments: MS Visual Studio 2001-2008; MS Visual C++; Borland Delphi; Borland C++Builder; C/C++ any; Rational Rose; GDPro; Together and etc.

Libraries: STL, ATL, WTL, MFC, NuMega Driver Works, VCL; .NET 1.0, 1.1, 2.0, 3.5; and etc.

Technologies: Client/Server; COM; DirectX; DirectX Media; BDE; HTML/DHTML; ActiveX; Java Servlets; DCOM; COM+; ADO; CORBA; .NET; Windows Forms; GDI/GDI+; and etc.

Application Skills: Databases - design and maintain, support, programming; GUI Design; System Programming, Security; Business Software Development. Win/Web Services development and etc.

Custom ComboBoxes with Advanced Drop-down Features

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