+ // Add the underline for the pre-edit text.
+ const GlyphIndex* const charactersToGlyphBuffer = mImpl->mVisualModel->mCharactersToGlyph.Begin();
+ const Length* const glyphsPerCharacterBuffer = mImpl->mVisualModel->mGlyphsPerCharacter.Begin();
+
+ const GlyphIndex glyphStart = *( charactersToGlyphBuffer + mImpl->mEventData->mPreEditStartPosition );
+ const CharacterIndex lastPreEditCharacter = mImpl->mEventData->mPreEditStartPosition + ( ( mImpl->mEventData->mPreEditLength > 0u ) ? mImpl->mEventData->mPreEditLength - 1u : 0u );
+ const Length numberOfGlyphsLastCharacter = *( glyphsPerCharacterBuffer + lastPreEditCharacter );
+ const GlyphIndex glyphEnd = *( charactersToGlyphBuffer + lastPreEditCharacter ) + ( numberOfGlyphsLastCharacter > 1u ? numberOfGlyphsLastCharacter - 1u : 0u );
+
+ GlyphRun underlineRun;
+ underlineRun.glyphIndex = glyphStart;
+ underlineRun.numberOfGlyphs = 1u + glyphEnd - glyphStart;
+
+ // TODO: At the moment the underline runs are only for pre-edit.
+ mImpl->mVisualModel->mUnderlineRuns.PushBack( underlineRun );
+