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Posted 12 Apr 2004

DateTimePicker appears flat

, 17 May 2005
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A simple and easy class that draws the standard DateTimePicker as a flat control.

Sample Image - FlatDateTimePicker.jpg


All the while, we have been using Lumisoft flat controls for our project. However the date picker control supplied does not have support for the time element. I decided to use the standard .NET DateTimePicker control, but the 3D appearance of the control looked really awful in the middle of all the flat controls. After much searching and reading, I couldn't find a readily usable class/control for the purpose that I wanted, and some suggested codes were rather complicated. Based on these information and suggestions by other authors, I came out with this class which is simple and yet functional. It does exactly what I want in a very simple way as well, by using the ControlPaint class supplied in the .NET framework.

Using the Class

This class inherits from DateTimePicker, therefore you can use it in exactly the same way as the DateTimePicker control or even as a replacement.

So instead of doing this:

DateTimePicker dtp = new DateTimePicker();

You will do:

DateTimePicker dtp = new FlatDateTimePicker();

// OR

FlatDateTimerPicker dtp = new FlatDateTimePicker();

That is how simple it is :)

Code Explanation

To achieve the flat look for the control, I had to override the WndProc method, which is the method that processes all the window messages for this control. We are particularly interested with WM_NC_PAINT, WM_PAINT and WM_NCHITTEST messages.

Note that in this method, we need to acquire the actual window DC for the control using WinAPI GetWindowDC and release it later by using ReleaseDC. One main reason of using this over simply creating the Graphics object is because we need the entire DC of the control (bound rectangle) not just the client rectangle, therefore we can paint the border.

protected override void WndProc(ref Message m)
 IntPtr hDC = GetWindowDC(m.HWnd);
 Graphics gdc = Graphics.FromHdc(hDC);
 switch (m.Msg)
  case WM_NC_PAINT:
   SendMessage(this.Handle, WM_ERASEBKGND, hDC, 0);
   SendMessage(this.Handle, WM_PAINT, IntPtr.Zero, 0);

   m.Result = (IntPtr)1; // indicate msg has been processed
  case WM_PAINT: base.WndProc(ref m);
    case  WM_NC_HITTEST:
   base.WndProc(ref m);
   if (DroppedDown)
    this.Invalidate(this.ClientRectangle, false);
   base.WndProc(ref m);
 ReleaseDC(m.HWnd, hDC);

WM_NC_PAINT message is received when the control needs to paint its border. Here I trapped the message and do the border painting myself without calling the base class method, because the base class will try to draw this with a 3D border. I also clear the area prior to the border drawing otherwise it may cause some potential redraw problem when a control/dialog overlays on top such as when a combo box pops up.

WM_PAINT message is received when the control needs to paint portions of its windows. Here we just pass the message to the base class and let the control take care of the drawing (including the display value), but after, we will override the border and the drop down button to ensure that they are flat. Overriding the border is optional here, but I did it for the user experience where if the control is in focus, it will have a black line border or otherwise none.

WM_NCHITTEST message is received when you move your mouse around within the control. Many have attempted to write flat controls but were unable to draw the pulldown arrow in flat when the popup appears, because of not trapping this message properly. Every time the pulldown is clicked, the CloseUp or DropDown is called and followed by a redraw which will paint the 3D arrow onto the control; therefore to achieve the flat look, we have to redraw it here. Simply calling Invalidate in this case block will cause flickering, so we will only want to redraw it when the Calendar control actually pops up.

Change Logs

  • 13 April 2004
    • Posted.
  • 22 April 2004
    • Fixed the missing text problem reported.
  • 18 May 2005
    • Fixed flickering problem.
    • DROPDOWNWIDTH value is dynamic now based on the system setting, hence will work well in different screen resolutions.
    • Fixed drop down button redraw problem when mouse is not moved.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Fadrian Sudaman
Architect SMS Management and Technology
Australia Australia
Fadrian Sudaman is an experienced IT professional who has worked with .NET technology since the early beta. His background stems from a strong C/C++ development experience in building large commercial applications and great appreciation for best practice and modern approaches for building quality software. Currently, Fadrian works as a senior consultant specialises in .NET technology involved in variety of roles including project management, solution architecture, presales and application development. Fadrian is also completing his PhD part time at Monash University, Australia.

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Comments and Discussions

Questionflat drop-down arrow button? Pin
Kaine2-Aug-10 0:46
memberKaine2-Aug-10 0:46 
GeneralDropdown Icon Pin
Dewayne Dodd6-Apr-09 15:02
memberDewayne Dodd6-Apr-09 15:02 
Generalfine control with one question Pin
thirstyDev2-Dec-08 19:56
memberthirstyDev2-Dec-08 19:56 
GeneralRe: fine control with one question Pin
Fadrian Sudaman3-Dec-08 2:10
memberFadrian Sudaman3-Dec-08 2:10 
GeneralGood work!! Just a small correction on PInvoke declaration Pin
Caio Proiete11-Jul-08 5:27
memberCaio Proiete11-Jul-08 5:27 
GeneralRed Rectangle Pin
diazpablomiguel23-Apr-08 5:22
memberdiazpablomiguel23-Apr-08 5:22 version Pin
MSP129-May-07 22:20
memberMSP129-May-07 22:20 
GeneralRe: version Pin
MSP129-May-07 22:35
memberMSP129-May-07 22:35 
I forgot to remove the following function before posting the VB version.

Protected Overrides Function IsInputKey(ByVal keyData As System.Windows.Forms.Keys) As Boolean
   If keyData = (Keys.Tab Or Keys.Shift) Then
     Return True
   ElseIf keyData = Keys.Tab Then
     Return True
     Return MyBase.IsInputKey(keyData)
   End If
 End Function

This was added because I needed special Tab key handling. You should remove this function if you want the default Tab key behaviour.

Malcolm Powell
GeneralRe: version Pin
S. Töpfer22-Feb-10 1:20
memberS. Töpfer22-Feb-10 1:20 
GeneralDateTimePicker with Popup FlatStyle support Pin
vachaun4-May-07 10:30
membervachaun4-May-07 10:30 
GeneralRe: DateTimePicker with Popup FlatStyle support Pin
Fadrian Sudaman5-May-07 15:00
memberFadrian Sudaman5-May-07 15:00 
GeneralRe: DateTimePicker with Popup FlatStyle support [modified] Pin
vachaun6-May-07 10:33
membervachaun6-May-07 10:33 
GeneralRe: DateTimePicker with Popup FlatStyle support Pin
Fadrian Sudaman9-May-07 2:57
memberFadrian Sudaman9-May-07 2:57 
GeneralRe: DateTimePicker with Popup FlatStyle support Pin
vachaun10-May-07 5:14
membervachaun10-May-07 5:14 
GeneralRe: DateTimePicker with Popup FlatStyle support Pin
Fadrian Sudaman10-May-07 13:22
memberFadrian Sudaman10-May-07 13:22 
GeneralRe: DateTimePicker with Popup FlatStyle support Pin
vachaun11-May-07 2:25
membervachaun11-May-07 2:25 version Pin
rgf2119-Mar-07 1:55
memberrgf2119-Mar-07 1:55 
AnswerRe: version Pin
Fadrian Sudaman9-May-07 3:01
memberFadrian Sudaman9-May-07 3:01 
GeneralRe: version Pin
MSP129-May-07 22:40
memberMSP129-May-07 22:40 
QuestionPInvokeStackInbalanceException raised Pin
Jacek Osiecki16-Jan-07 2:12
memberJacek Osiecki16-Jan-07 2:12 
AnswerRe: PInvokeStackInbalanceException raised Pin
Fadrian Sudaman16-Jan-07 13:00
memberFadrian Sudaman16-Jan-07 13:00 
GeneralRe: PInvokeStackInbalanceException raised Pin
Jacek Osiecki16-Jan-07 23:38
memberJacek Osiecki16-Jan-07 23:38 
GeneralTransparencyKey problem Pin
AlexDias3-Oct-06 8:12
memberAlexDias3-Oct-06 8:12 
GeneralRe: TransparencyKey problem Pin
Fadrian Sudaman4-Oct-06 3:25
memberFadrian Sudaman4-Oct-06 3:25 
GeneralTime select didn not appear Pin
jcui@activplant.com13-Jun-05 8:12
memberjcui@activplant.com13-Jun-05 8:12 

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