TextChild Control Pattern
Introduces guidelines and conventions for implementing ITextChildProvider, including information about properties and methods. The TextChild control pattern is used to access an element’s nearest ancestor that supports the Text control pattern.
For example, suppose text in a document contains an embedded image and a hyperlink as shown in the following image.
If you use Microsoft UI Automation tools to examine the UI Automation tree for this document content, it might show a document element with one child element that represents the image, and another child element that represents the hyperlink. For example:
Typically, the document element in the preceding example supports the Text control pattern, but the two children of the document element do not. If a UI Automation client application has a reference to the image element or hyperlink element, the client can use the TextChild control pattern as a convenient way to access the Textcontrol pattern exposed by the containing document element.
Implementation Guidelines and Conventions
When implementing the ITextChildProvider interface, note the following guidelines and conventions:
- The ITextChildProvider::TextContainer property should specify the nearest ancestor element that supports ITextProvider interface, regardless of whether elements higher in the ancestor chain also support ITextProvider.
- An element should not support both theITextProvider and the ITextChildProvider** interface.
- An element that implements ITextChildProvider must be a child, or descendent, of an element that implements ITextProvider. It is not required that this element also implement the Text control pattern.
- The ITextChildProvider::TextRange property should specify the same text range as the one that the containing text provider element returns when its ITextProvider::RangeFromChild function is called with the text child element as the enclosed child element.
Required Members for ITextChildProvider
These properties and methods are required for implementing the ITextChildProvider interface.
| Required members | Member type | Notes |
|---|---|---|
| TextContainer | Property | None |
| TextRange | Property | None |
This control pattern has no associated methods or events.
Related topics
Conceptual