gecko-dev/layout/mathml/nsMathMLmmultiscriptsFrame.h
Gerald Squelart b099eab802 Bug 1488684 - Made nsIFrame-derived classes and some others 'final' where possible - r=dbaron
All classes deriving from nsIFrame that did not have any subclasses themselves
(at the time of writing this patch) have been marked with `final`.
Some other Layout classes have also been made final, but this was opportunistic
while working on nsIFrame subclasses, and is definitely not exhaustive, further
patches welcome; refer to bug 1332680.

Advantages of marking a class final include:
- Allowing the compiler to devirtualize some method calls (i.e., calling
  virtual functions directly instead of going through the vtable),
- Indicating that the class is not currently subclassed,
- Preventing subclassing without being aware that this would remove the
  finalization benefits of the parent class.
`final` does not signify that these classes should *never* be subclassed, this
is left for developers to decide.

Differential Revision: https://phabricator.services.mozilla.com/D5020

--HG--
extra : moz-landing-system : lando
2018-09-06 01:23:14 +00:00

57 lines
1.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsMathMLmmultiscriptsFrame_h___
#define nsMathMLmmultiscriptsFrame_h___
#include "mozilla/Attributes.h"
#include "nsMathMLContainerFrame.h"
//
// <mmultiscripts> -- attach prescripts and tensor indices to a base
// <msub> -- attach a subscript to a base
// <msubsup> -- attach a subscript-superscript pair to a base
// <msup> -- attach a superscript to a base
//
class nsMathMLmmultiscriptsFrame final : public nsMathMLContainerFrame
{
public:
NS_DECL_FRAMEARENA_HELPERS(nsMathMLmmultiscriptsFrame)
friend nsIFrame* NS_NewMathMLmmultiscriptsFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);
NS_IMETHOD
TransmitAutomaticData() override;
virtual nsresult
Place(DrawTarget* aDrawTarget,
bool aPlaceOrigin,
ReflowOutput& aDesiredSize) override;
static nsresult
PlaceMultiScript(nsPresContext* aPresContext,
DrawTarget* aDrawTarget,
bool aPlaceOrigin,
ReflowOutput& aDesiredSize,
nsMathMLContainerFrame* aForFrame,
nscoord aUserSubScriptShift,
nscoord aUserSupScriptShift,
float aFontSizeInflation);
uint8_t
ScriptIncrement(nsIFrame* aFrame) override;
protected:
explicit nsMathMLmmultiscriptsFrame(ComputedStyle* aStyle)
: nsMathMLContainerFrame(aStyle, kClassID) {}
virtual ~nsMathMLmmultiscriptsFrame();
};
#endif /* nsMathMLmmultiscriptsFrame_h___ */