WPF: Slider precision with time format

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I have an slider to display the time selected into a textblock with format 00:00:00 and to send it with format 000000.00 as a string.

C#

<WrapPanel  Margin="5" Orientation="Horizontal" x:Name="timeRow" >
            <Label TextOptions.TextFormattingMode="Ideal" Width="140" Foreground="#2B3856" FontWeight="Bold" FontSize="16"   Margin="3">Time </Label>
            <Slider HorizontalAlignment="Left" x:Name="timeSlider_15" 
                 Margin="3"
                 VerticalAlignment="Top"
                 Width="250"
                 ValueChanged="Slider_TimeValueChanged" Minimum="0" Maximum="24" TickFrequency="1" AutoToolTipPlacement="BottomRight" />
            <TextBlock TextOptions.TextFormattingMode="Ideal" Width="75"  Foreground="#2B3856"  FontSize="16" Text="00:00:00" x:Name="TimeText" ></TextBlock>
          </WrapPanel>
        </WrapPanel>

C#

private void Slider_TimeValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
      {
          var slider = sender as Slider;
          TimeSpan Time = TimeSpan.FromHours(slider.Value);
          double tiest = slider.Value ;
          this.TimeText.Text = Time.ToString("hh\\:mm\\:ss");
          ///Create MSO sentence
          int index = Convert.ToInt32(Regex.Match(slider.Name, @"\d+").Value);
          //......
          double timeconverted = slider.Value * 10000;
          sentenceToSent.SetField(index, Time.ToString("hh\\:mm\\:ss\\.ff").Replace(":", ""));

          _myTrucker.Bridge.SendTime(port, host, sentenceToSent.ToString());
      }

Formats are now undercontrol. My problem now is the precision of the selection. With my code when you move the slider the textbox doesn't shows values incresing regulari like 00:00:01 , 00:00:02 ,... , Instead values grows like 00:06:13 , 00:12:28 ,...How can I solve it preserving my formats?

Posted 11-Dec-14 2:30am

Kinna-10626331

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TheRealSteveJudge · Answer 1 · 2014-12-11T02:49:00

Change Maximum to "86400".
That is 24 hours in seconds.
This will give you a granularity of 1 second.

Please have a look at the example below:

The conversion from seconds to e.g. 12:22:45
will be done by a value converter.

TimeConverter.cs

C#

using System;
using System.Windows.Data;

namespace WpfApplicationSliderTest
{
    class TimeConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string timeString = string.Empty;

            int seconds = System.Convert.ToInt32((double)value);

            TimeSpan ts = new TimeSpan(0, 0, seconds);

            timeString = ts.ToString(@"hh\:mm\:ss");

            return timeString;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

MainWindow.xaml:

C#

<Window x:Class="WpfApplicationSliderTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplicationSliderTest"
        Title="MainWindow" Height="350" Width="525">
    
    <Window.Resources>
        <local:TimeConverter x:Key="tc"></local:TimeConverter>
    </Window.Resources>
    <Grid>
        <StackPanel Orientation="Vertical">
            <Slider x:Name="slider" Minimum="0" Maximum="86400" SmallChange="1" LargeChange="1" TickFrequency="1" IsSnapToTickEnabled="True" Margin="10"></Slider>
            <TextBlock Text="{Binding ElementName=slider,Path=Value,Converter={StaticResource tc}}"></TextBlock>
        </StackPanel>
    </Grid>
</Window>

Dragging the slider does not show the real granularity.
The steps seem to be bigger.

I added SmallChange="1". When you use the arrow up/down keys on your keyboard
you see each key press is changing the value by 1.

I also added LargeChange="1". When you click left or right of the slider button
the value is also increased/decreased by 1.