IDWriteTextLayout::HitTestTextPosition method (dwrite.h)
The application calls this function to get the pixel location relative to the top-left of the layout box given the text position and the logical side of the position. This function is normally used as part of caret positioning of text where the caret is drawn at the location corresponding to the current text editing position. It may also be used as a way to programmatically obtain the geometry of a particular text position in UI automation.
HRESULT HitTestTextPosition( UINT32 textPosition, BOOL isTrailingHit, [out] FLOAT *pointX, [out] FLOAT *pointY, [out] DWRITE_HIT_TEST_METRICS *hitTestMetrics );
The text position used to get the pixel location.
A Boolean flag that indicates whether the pixel location is of the leading or the trailing side of the specified text position.
When this method returns, contains the output pixel location X, relative to the top-left location of the layout box.
When this method returns, contains the output pixel location Y, relative to the top-left location of the layout box.
When this method returns, contains the output geometry fully enclosing the specified text position.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
|Minimum supported client||Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista [desktop apps | UWP apps]|
|Minimum supported server||Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008 [desktop apps | UWP apps]|