mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-24 02:35:41 +00:00
b099eab802
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
51 lines
1.9 KiB
C++
51 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 nsSelectsAreaFrame_h___
|
|
#define nsSelectsAreaFrame_h___
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsBlockFrame.h"
|
|
|
|
class nsSelectsAreaFrame final : public nsBlockFrame
|
|
{
|
|
public:
|
|
NS_DECL_FRAMEARENA_HELPERS(nsSelectsAreaFrame)
|
|
|
|
friend nsContainerFrame* NS_NewSelectsAreaFrame(nsIPresShell* aShell,
|
|
ComputedStyle* aStyle,
|
|
nsFrameState aFlags);
|
|
|
|
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists) override;
|
|
|
|
void BuildDisplayListInternal(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists);
|
|
|
|
virtual void Reflow(nsPresContext* aCX,
|
|
ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput,
|
|
nsReflowStatus& aStatus) override;
|
|
|
|
nscoord BSizeOfARow() const { return mBSizeOfARow; }
|
|
|
|
protected:
|
|
explicit nsSelectsAreaFrame(ComputedStyle* aStyle) :
|
|
nsBlockFrame(aStyle, kClassID),
|
|
// initialize to wacky value so first call of
|
|
// nsSelectsAreaFrame::Reflow will always invalidate
|
|
mBSizeOfARow(nscoord_MIN)
|
|
{}
|
|
|
|
// We cache the block size of a single row so that changes to the
|
|
// "size" attribute, padding, etc. can all be handled with only one
|
|
// reflow. We'll have to reflow twice if someone changes our font
|
|
// size or something like that, so that the block size of our options
|
|
// will change.
|
|
nscoord mBSizeOfARow;
|
|
};
|
|
|
|
#endif /* nsSelectsAreaFrame_h___ */
|