ITextProvider::RangeFromChild method (uiautomationcore.h)

Retrieves a text range that encloses the specified child element (for example, an image, hyperlink, or other embedded object).

Syntax

HRESULT RangeFromChild(
  [in]          IRawElementProviderSimple *childElement,
  [out, retval] ITextRangeProvider        **pRetVal
);

Parameters

[in] childElement

Type: IRawElementProviderSimple*

The UI Automation provider of the specified child element.

[out, retval] pRetVal

Type: ITextRangeProvider**

The text range that encloses the child element.

This range completely encloses the content of the child element such that:

1. ITextRangeProvider::GetEnclosingElement returns the child element itself, or the innermost descendant of the child element that shares the same text range as the child element
2. ITextRangeProvider::GetChildren returns children of the element from (1) that are completely enclosed within the range
3. Both endpoints of the range are at the boundaries of the child element

This parameter is passed uninitialized.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

Each element retrieved with ITextRangeProvider::GetChildren also has a valid text range that can be retrieved through RangeFromChild. This includes any elements in the UI Automation tree between the ITextProvider and the child element.

Examples

1. This example shows a text stream that contains an image link. The link is a child of the image, but both span the same text range and are exposed as embedded objects within the text stream.

   Hello <Image Link> World

   • Both image and link are also descendents of the stream's ITextProvider, and either can be specified as the childElement in a call to ITextProvider::RangeFromChild.
   • Calling ITextRangeProvider::RangeFromChild, using either the image or the link, returns the same text range (Range1).
   • ITextRangeProvider::GetChildren does not return the link.
   • ITextRangeProvider::GetEnclosingElement does not return the image for any text range.
   • ITextRangeProvider::GetEnclosingElement on Range1 returns the link.
   • ITextRangeProvider::GetChildren on Range1 does not return any children.
   • ITextRangeProvider::GetEnclosingElement on the text range for the stream's ITextProvider returns the provider.
   • ITextRangeProvider::GetChildren on the text range for the stream's ITextProvider returns only the image.

2. This example shows a text stream that contains a two-cell table surrounded by text.

   Start text

   Table Cell 1

   Table Cell 2

   End Text

   • Case 1: The stream's ITextProvider and entire text range
     • ITextRangeProvider::GetEnclosingElement on the entire text range returns the stream's ITextProvider.
     • GetChildren returns all child elements of the stream's ITextProvider, only the table element in this case.
   • Case 2: Text range obtained by calling ITextProvider::RangeFromChild on the table element:
     • ITextRangeProvider::GetEnclosingElement returns the table element.
     • ITextRangeProvider::GetChildren returns both table cells.
   • Case 3: Text range that spans the visual content of Table Cell 1 Table Cell 2:
     • ITextRangeProvider::GetEnclosingElement returns the table element.
     • ITextRangeProvider::GetChildren returns both table cells.
   • Case 4: Text range that spans the word Cell of Table Cell 1:
     • ITextRangeProvider::GetEnclosingElement returns the first cell element.
     • ITextRangeProvider::GetChildren returns no elements.
   • Case 5: A degenerate (empty) text range that represents both starts (table and first cell):
     • ITextRangeProvider::GetEnclosingElement returns the first cell element (the innermost element with a range that includes the degenerate range).
     • ITextRangeProvider::GetChildren returns no elements.

Requirements

See also

ITextProvider, ITextRangeProvider, ITextRangeProvider::GetEnclosingElement, ITextRangeProvider::GetChildren, UI Automation Providers Overview