Implementing the UI Automation RangeValue Control Pattern
Note
This documentation is intended for .NET Framework developers who want to use the managed UI Automation classes defined in the System.Windows.Automation namespace. For the latest information about UI Automation, see Windows Automation API: UI Automation.
This topic introduces guidelines and conventions for implementing IRangeValueProvider, including information about events and properties. Links to additional references are listed at the end of the topic.
The RangeValuePattern control pattern is used to support controls that can be set to a value within a range. For examples of controls that implement this control pattern, see Control Pattern Mapping for UI Automation Clients.
Implementation Guidelines and Conventions
When implementing the Range Value control pattern, note the following guidelines and conventions:
Controls allow recalibration of their supported properties based upon locale or user preference. An example of this is a thermometer control that can be set to display the temperature in Fahrenheit or Celsius.
Controls that have ambiguous range values, such as progress bars or sliders, should have those values normalized.
Example of a Progress Bar Where Value Is of Type Integer and Minimum and Maximum Property Values Are Normalized to 0 and 100, Respectively
Required Members for IRangeValueProvider
| Required member | Member type | Notes |
|---|---|---|
| IsReadOnlyProperty | Property | None |
| ValueProperty | Property | None |
| LargeChangeProperty | Property | None |
| SmallChangeProperty | Property | None |
| MaximumProperty | Property | None |
| MinimumProperty | Property | None |
| SetValue | Methods | None |
This control pattern has no associated events.
Exceptions
Providers must throw the following exceptions.
| Exception type | Condition |
|---|---|
| ArgumentOutOfRangeException | SetValue is called with a value that is either greater than MaximumProperty or less than MinimumProperty. |