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Menu Overview / Radial Menu / Radial Numeric Slider Menu
Radial Numeric Slider Menu

The RadialMenu control allows you to create a radial numeric slider menu. This is especially useful for applications where you might want users to select a font size for an application. You'll use both XAML markup and code to create the application. 

Complete the following steps to create a radial numeric slider menu:

  1. Locate the <Grid> </Grid> tags on your page and replace them with the following markup to create the framework for your application:
    XAML
    Copy Code 
    <Page.Resources>
        <Style TargetType="TextBlock" x:Key="TextIconStyle">
            <Setter Property="Margin" Value="-10" />
            <Setter Property="FontSize" Value="20" />
            <Setter Property="FontFamily" Value="Segoe UI Symbol" />
            <Setter Property="FontWeight" Value="Normal" />
            <Setter Property="Foreground" Value="#333333" />
            <Setter Property="HorizontalAlignment" Value="Center" />
            <Setter Property="VerticalAlignment" Value="Center" />
        </Style>
        <Style TargetType="Image" x:Key="MenuIcon">
            <Setter Property="Width" Value="16"/>
            <Setter Property="Height" Value="16"/>
            <Setter Property="Margin" Value="0"/>
        </Style>
    </Page.Resources>
    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <c1:C1ContextMenuService.ContextMenu>
        </c1:C1ContextMenuService.ContextMenu>
        <c1:C1ListViewer x:Name="text" Foreground="Sienna" HorizontalAlignment="Stretch" VerticalAlignment="Center" Height="75" ZoomMode="Disabled" FontSize="16" >
            <TextBlock Text="Touch: hold down for a few seconds until the indicator displays.&#10;Keyboard: press the context-menu button over this text.&#10;Mouse: right-click over this text." TextWrapping="Wrap" />
        </c1:C1ListViewer>
        <TextBlock x:Name="txt" Foreground="Red" Text="" FontSize="16" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="10" />
  2. Locate the <c1:C1ContextMenuService.ContextMenu> </c1:C1ContextMenuService.ContextMenu> tags within the markup you just added. Place your cursor between the tags.
  3. Locate the C1RadialMenu control in the Visual Studio ToolBox and double-click it to add it to your application.
  4. Edit the opening <C1RadialMenu> tag so that it resembles the following:
    XAML
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    <c1:C1RadialMenu x:Name="contextMenu" Offset="-130,0" Opened="contextMenu_Opened" AccentBrush="ForestGreen" ItemClick="contextMenu_ItemClick" ItemOpened="contextMenu_ItemOpened" BorderBrush="#FFC6DEC4">
  5. Add the following markup between the <C1RadialMenu> </C1RadialMenu> tags to add one C1RadialNumericItems to your application. Note that you are also adding several sub items and a custom item icon:
    XAML
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    <c1:C1RadialNumericItem Header="Font Size" Minimum="9" Maximum="72" MarkStartAngle="-128" MarkEndAngle="231" x:Name="fontSize" Value="11">
    <c1:C1RadialNumericItem.Icon>
      <TextBlock Style="{StaticResource TextIconStyle}" FontFamily="Segoe UI" FontSize="18">
         <Run Text="A"/>
         <Run Text="{Binding Value, ElementName=fontSize}" Typography.Variants="Superscript"/>
      </TextBlock>
   </c1:C1RadialNumericItem.Icon>
   <x:Double>9</x:Double>
   <x:Double>11</x:Double>
   <x:Double>13</x:Double>
   <x:Double>16</x:Double>
   <x:Double>20</x:Double>
   <x:Double>36</x:Double>
   <x:Double>72</x:Double>
</c1:C1RadialNumericItem>
  6. Right-click the page and select View Code from the list.
  7. Add the following using statement to the top of the page:
    C#
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    using C1.WPF.Core;
using C1.WPF.Menu;
  8. Add the following ItemClick event to the page. This will allow the size of the text in the TextBox control to change size depending on the item selected:
    XAML
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    private void contextMenu_ItemClick(object sender, SourcedEventArgs e)
        {
            C1RadialMenuItem item = e.Source as C1RadialMenuItem;
if (item is C1RadialNumericItem)
            {
                txt.FontSize = ((C1RadialNumericItem)item).Value;
                txt.Text = "Item Clicked: " + ((C1RadialNumericItem)item).Value.ToString();
            }
            else
            {
                txt.Text = "Item Clicked: " + (item.Header ?? item.Name).ToString();
            }
        }
  9. Then, add two more events. This code will control the ItemOpened and Opened events:
    XAML
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    private void contextMenu_ItemOpened(object sender, SourcedEventArgs e)
        {
            C1RadialMenuItem item = e.Source as C1RadialMenuItem;
            txt.Text = "Item Opened: " + (item.Header ?? item.Name).ToString();
        }
        private void contextMenu_Opened(object sender, EventArgs e)
        {
            // expand menu immediately, as in this sample we don't have    underlying editable controls
            contextMenu.Expand();
        }
  10. Press F5 or start debugging to run your application. Your C1RadialMenu control should resemble the following:

  11. When you click on the Font Size option, the C1NumericRadialItems will be displayed: