AccessibleCaret::PositionChangedResult
AccessibleCaret::SetPosition(nsIFrame* aFrame, int32_t aOffset)
{
if (!CustomContentContainerFrame()) {
return PositionChangedResult::NotChanged;
}
nsRect imaginaryCaretRectInFrame =
nsCaret::GetGeometryForFrame(aFrame, aOffset, nullptr);
imaginaryCaretRectInFrame =
nsLayoutUtils::ClampRectToScrollFrames(aFrame, imaginaryCaretRectInFrame);
if (imaginaryCaretRectInFrame.IsEmpty()) {
// Don't bother to set the caret position since it's invisible.
mImaginaryCaretRect = nsRect();
mZoomLevel = 0.0f;
return PositionChangedResult::Invisible;
}
nsRect imaginaryCaretRect = imaginaryCaretRectInFrame;
nsLayoutUtils::TransformRect(aFrame, RootFrame(), imaginaryCaretRect);
float zoomLevel = GetZoomLevel();
if (imaginaryCaretRect.IsEqualEdges(mImaginaryCaretRect) &&
FuzzyEqualsMultiplicative(zoomLevel, mZoomLevel)) {
return PositionChangedResult::NotChanged;
}
mImaginaryCaretRect = imaginaryCaretRect;
mZoomLevel = zoomLevel;
// SetCaretElementStyle() and SetSelectionBarElementStyle() require the
// input rect relative to container frame.
nsRect imaginaryCaretRectInContainerFrame = imaginaryCaretRectInFrame;
nsLayoutUtils::TransformRect(aFrame, CustomContentContainerFrame(),
imaginaryCaretRectInContainerFrame);
SetCaretElementStyle(imaginaryCaretRectInContainerFrame, mZoomLevel);
SetSelectionBarElementStyle(imaginaryCaretRectInContainerFrame, mZoomLevel);
return PositionChangedResult::Changed;
}
bool FuzzyEqualsCoordinate(float aValue1, float aValue2)
{
return FuzzyEqualsAdditive(aValue1, aValue2, COORDINATE_EPSILON)
|| FuzzyEqualsMultiplicative(aValue1, aValue2);
}
