I am looking for a solution to a time picker which allows me to select the following:
00:30 > 01:00 > 01:30
When it reaches 23:30 it needs to wrap around to 0:00.
In other words I need to increment a half hourly period by selecting up or down. I have tried incorporating a hscroll
bar and amending a timepicker
but this is quite sensitive and un-necessary in my view as I suspect there must be an easier way?
Any suggestions would be excellent.
I just sub-classed a DomainUpDown
control to do this, here's the code:
class TimePicker : DomainUpDown
{
public TimePicker()
{
// build the list of times, in reverse order because the up/down buttons go the other way
for (double time = 23.5; time >= 0; time -= 0.5)
{
int hour = (int)time; // cast to an int, we only get the whole number which is what we want
int minutes = (int)((time - hour) * 60); // subtract the hour from the time variable to get the remainder of the hour, then multiply by 60 as .5 * 60 = 30 and 0 * 60 = 0
this.Items.Add(hour.ToString("00") + ":" + minutes.ToString("00")); // format the hour and minutes to always have two digits and concatenate them together with the colon between them, then add to the Items collection
}
this.SelectedIndex = Items.IndexOf("09:00"); // select a default time
this.Wrap = true; // this enables the picker to go to the first or last item if it is at the end of the list (i.e. if the user gets to 23:30 it wraps back around to 00:00 and vice versa)
}
}
Add the control to your form like so:
TimePicker picker1;
public Form1()
{
InitializeComponent();
picker1 = new TimePicker();
picker1.Name = "timePicker";
picker1.Location = new Point(10, 10);
Controls.Add(picker1);
}
Then when we want to get the selected time (I use a button here), we simply use the SelectedItem
property:
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(picker1.SelectedItem.ToString()); // will show "09:00" when 09:00 is selected in the picker
}
Documentation for DomainUpDown
: http://msdn.microsoft.com/en-us/library/system.windows.forms.domainupdown.aspx
What I have done in the past was built a list (2 columns) and bound to the combobox. The first columns was just a string representing the time... the second was a double value corresponding to it. Then, the combboox, I would have the DISPLAY value based on the time representation, but the ACTUAL value based on the double value...
ex:
Display Actual
00:00 = 0.0
00:30 = 0.5
01:00 = 1.0
....
12:30 = 12.5
13:00 = 13.0
etc.
It's been some time since that, but could be generated via a simple loop in increments of .5 going 0 to 23.50 (23:30 night)
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