gecko-dev/layout/base/DisplayItemScrollClip.cpp

43 строки
1.2 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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/. */
#include "DisplayItemScrollClip.h"
namespace mozilla {
/* static */ bool
DisplayItemScrollClip::IsAncestor(const DisplayItemScrollClip* aAncestor,
const DisplayItemScrollClip* aDescendant)
{
if (!aAncestor) {
// null means root.
return true;
}
for (const DisplayItemScrollClip* sc = aDescendant; sc; sc = sc->mCrossStackingContextParent) {
if (sc == aAncestor) {
return true;
}
}
return false;
}
/* static */ nsCString
DisplayItemScrollClip::ToString(const DisplayItemScrollClip* aScrollClip)
{
nsAutoCString str;
for (const DisplayItemScrollClip* scrollClip = aScrollClip;
scrollClip; scrollClip = scrollClip->mParent) {
str.AppendPrintf("<%s>", scrollClip->mClip ? scrollClip->mClip->ToString().get() : "null");
if (scrollClip->mParent) {
str.Append(" ");
}
}
return str;
}
} // namespace mozilla