devexpress-examples / how-to-use-custom-elements-in-the-linear-gauge-control-e3537

Display Up and Down buttons within a linear gauge.

WPF Linear Gauge - Display Custom UI Elements

This example displays Up and Down buttons within the linear scale. The Up button increases the scale value. The Down button decreases the scale value.

Implementation Details

Create a ScaleCustomElement object with a custom UI element and add the object to the Scale.CustomElements collection to display custom content within a scale. This example creates two ScaleCustomElement objects with Up and Down buttons:

<dxga:LinearScale >
    <dxga:LinearScale.CustomElements>
        <dxga:ScaleCustomElement VerticalAlignment="Top" HorizontalAlignment="Right">
            <Button Name="button1" Content="Up" Width="59"  Click="button1_Click" />
        </dxga:ScaleCustomElement>
        <dxga:ScaleCustomElement VerticalAlignment="Bottom" HorizontalAlignment="Right">
            <Button Name="button2" Content="Down" Width="59" Click="button2_Click" />
        </dxga:ScaleCustomElement>
    </dxga:LinearScale.CustomElements>
</dxga:LinearScale>

The Click event of each button is handled to allow users to change the scale value:

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;
}

Files to Review

• MainWindow.xaml (VB: MainWindow.xaml)
• MainWindow.xaml.cs (VB: MainWindow.xaml.vb)

Documentation

• Scale.CustomElements
• ScaleCustomElement

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