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ExtendedDateTimePicker control with week numbers

By , 14 Jan 2007
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Sample screenshot

Introduction

My mission was to find a DateTimePicker control supporting week numbers. This was not as easy as I'd expected it to be...

After having Googled all day (almost), and obviously not finding any code here at The Code Project, I found a bit of VB code that helped me further... However, as all my components are written in C#, I started "translating" it. This article simply enlists the code in C#. The original VB code under the original article "Displaying week numbers in a DateTimePicker control's dropdown part" by Herfried K. Wagnercan, can be found here.

Feedback

Feel free to report any errors or further thoughts about the code! The code lacks comments, but is quite self-explanatory for an intermediate programmer with some experience of Win32.

The Code

using System;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace WindowsApplication3
{
    public class ExtendedDateTimePicker : DateTimePicker
    {
        [DllImport("User32.dll")]
        private static extern int GetWindowLong(IntPtr h, int index);

        [DllImport("User32.dll")]
        private static extern int SetWindowLong(IntPtr h, int index, int value);

        private const int GWL_STYLE = (-16);
        private const int MCM_FIRST = 0x1000;
        private const int MCM_GETMINREQRECT = (MCM_FIRST + 9);
        private const int MCS_WEEKNUMBERS = 0x4;
        private const int DTM_FIRST = 0x1000;
        private const int DTM_GETMONTHCAL = (DTM_FIRST + 8);

        [DllImport("User32.dll")]
        private static extern IntPtr SendMessage(IntPtr h, 
                       int msg, int param, int data);

        [DllImport("User32.dll")]
        private static extern int SendMessage(IntPtr h, int msg, 
                       int param, ref Rectangle data);

        [DllImport("User32.dll")]
        private static extern int MoveWindow(IntPtr h, int x, int y, 
                       int width, int height, bool repaint);

        private bool m_ShowWeekNumbers;

        [Browsable(true), DesignerSerializationVisibility(
                              DesignerSerializationVisibility.Visible)]
        public bool ShowWeekNumbers
        {
            get
            {
                return m_ShowWeekNumbers;
            }
            set
            {
                m_ShowWeekNumbers = value;
            }
        }

        protected override void OnDropDown(EventArgs e)
        {
            IntPtr monthView = SendMessage(Handle, DTM_GETMONTHCAL, 0, 0);
            int style = GetWindowLong(monthView, GWL_STYLE);
            if (ShowWeekNumbers)
            {
                style = style | MCS_WEEKNUMBERS;
            }
            else
            {
                style = style & ~MCS_WEEKNUMBERS;
            }
            Rectangle rect = new Rectangle();
            SetWindowLong(monthView, GWL_STYLE, style);
            SendMessage(monthView, MCM_GETMINREQRECT, 0, ref rect);
            MoveWindow(monthView, 0, 0, rect.Right + 2, rect.Bottom, true);
            base.OnDropDown(e);
        }
    }
}

License

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

About the Author

_JERKER_
Software Developer (Senior)
Sweden Sweden
No Biography provided

Comments and Discussions

 
QuestionWindows 7 DTP Month FIX [modified] PinmemberMaggYe2-Jul-13 3:53 
GeneralReally Nice Pinmemberrapunsel11130-Apr-12 1:31 
SuggestionISO 8601 Pinmemberschub27-Feb-12 1:23 
GeneralRe: ISO 8601 Pinmember_JERKER_1-Mar-12 6:08 
GeneralRe: ISO 8601 PinmemberMember 427386310-Apr-12 2:42 
GeneralMy vote of 5 Pinmemberwijnandnagelhout17-Nov-11 3:15 
GeneralMy vote of 4 Pinmemberdragon_MF6-Nov-11 12:52 
GeneralSir PinmemberJx Cx2-Sep-09 22:33 
GeneralIs it that much complicated , see my work arround PinmemberMember 48506911-Feb-09 21:14 
I do not think it is that much comlicated
 
see my work arround for displying week number
 
Swich on custom format in the desinger
 
Put this code in form load
 
DTPWeek1.Value=Now.Date
 
add this method for value changed event
 
sub DTPWeek1_ValueChanged ( ...) handles DTPWeek1.ValueChanged
 
DTPWeek1.CustomFormat= "'" + DatePart(DateInterval.Year ,DTPWeek1.value ).Tostring & " week " & DatePart(DateInterval.WeekofYear ,DTPWeek1.value ).Tostring & "'"
 
end sub
 
And this method is known as using body text Datetime picker control and it is a must body
To be inside quotes like 'bodytext'
Smile | :)
regards
john
RantProblem using this derived component PinmemberLagrange11-Aug-08 3:35 
GeneralSend sample project Pinmemberjawahar srinivasan24-Mar-08 18:48 
Questionwidth of dropdown part Pinmemberjava4me13-Nov-07 23:33 
GeneralRe: width of dropdown part Pinmemberrejuwi14-Dec-07 4:19 

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