How to: Use Custom Elements in the Linear Gauge Control

Jun 07, 2019
2 minutes to read

This example illustrates how to add two buttons as custom elements to the linear scale and use them to increase or decrease the current scale value.

For this, create two ScaleCustomElement objects and add a button control to each custom element.

Finally, to provide the capability for end-users to change the scale’s value, handle the button1_Click and button2_Click events and write code that will increment and decrement the scale value.

View Example

MainWindow.xaml
MainWindow.xaml.cs
MainWindow.xaml.vb

xaml

<Window x:Class="LinearGauge_CustomElement.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxga="http://schemas.devexpress.com/winfx/2008/xaml/gauges"
        Title="MainWindow" Height="450" Width="325">
    <Grid>
        <dxga:LinearGaugeControl Name="linearGaugeControl1" Width="170" >
            <dxga:LinearGaugeControl.Scales>
                <dxga:LinearScale >
                    <dxga:LinearScale.CustomElements>
                        <dxga:ScaleCustomElement VerticalAlignment="Top" HorizontalAlignment="Right">
                            <Button Name="button1" Content="Up" Width="40" Click="button1_Click" />
                        </dxga:ScaleCustomElement>
                        <dxga:ScaleCustomElement VerticalAlignment="Bottom" HorizontalAlignment="Right">
                            <Button Name="button2" Content="Down" Width="40" Click="button2_Click" />
                        </dxga:ScaleCustomElement>
                    </dxga:LinearScale.CustomElements>
                    <dxga:LinearScale.LevelBars >
                        <dxga:LinearScaleLevelBar x:Name="bar" Value="50" />
                    </dxga:LinearScale.LevelBars >
                    <dxga:LinearScale.Layers>
                        <dxga:LinearScaleLayer />
                    </dxga:LinearScale.Layers>
                </dxga:LinearScale>
            </dxga:LinearGaugeControl.Scales>
            <dxga:LinearGaugeControl.Model>
                <dxga:LinearCleanWhiteModel />
            </dxga:LinearGaugeControl.Model>
        </dxga:LinearGaugeControl>
    </Grid>
</Window>

csharp

using System.Windows;

namespace LinearGauge_CustomElement {

    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e) {
            if (bar.Value < 100)
                bar.Value += 10;
        }

        private void button2_Click(object sender, RoutedEventArgs e) {
            if (bar.Value > 0)
                bar.Value -= 10;
        }
    }
}

Imports Microsoft.VisualBasic
Imports System.Windows

Namespace LinearGauge_CustomElement

    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If bar.Value < 100 Then
                bar.Value += 10
            End If
        End Sub

        Private Sub button2_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If bar.Value > 0 Then
                bar.Value -= 10
            End If
        End Sub
    End Class
End Namespace