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/* -*- 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/. */
/* a CSS style sheet returned from nsIStyleSheetService.preloadSheet */
#include "PreloadedStyleSheet.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/Promise.h"
#include "nsICSSLoaderObserver.h"
#include "nsLayoutUtils.h"
namespace mozilla {
PreloadedStyleSheet::PreloadedStyleSheet(nsIURI* aURI,
css::SheetParsingMode aParsingMode)
: mLoaded(false), mURI(aURI), mParsingMode(aParsingMode) {}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PreloadedStyleSheet)
NS_INTERFACE_MAP_ENTRY(nsIPreloadedStyleSheet)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(PreloadedStyleSheet)
NS_IMPL_CYCLE_COLLECTING_RELEASE(PreloadedStyleSheet)
NS_IMPL_CYCLE_COLLECTION(PreloadedStyleSheet, mSheet)
Result<StyleSheet*, nsresult> PreloadedStyleSheet::GetSheet() {
MOZ_DIAGNOSTIC_ASSERT(mLoaded);
if (!mSheet) {
auto loader = MakeRefPtr<css::Loader>();
MOZ_TRY_VAR(mSheet,
loader->LoadSheetSync(mURI, mParsingMode,
css::Loader::UseSystemPrincipal::Yes));
}
return {mSheet.get()};
}
nsresult PreloadedStyleSheet::Preload() {
MOZ_DIAGNOSTIC_ASSERT(!mLoaded);
mLoaded = true;
MOZ_TRY(GetSheet());
return NS_OK;
}
NS_IMPL_ISUPPORTS(PreloadedStyleSheet::StylesheetPreloadObserver,
nsICSSLoaderObserver)
NS_IMETHODIMP
PreloadedStyleSheet::StylesheetPreloadObserver::StyleSheetLoaded(
StyleSheet* aSheet, bool aWasDeferred, nsresult aStatus) {
MOZ_DIAGNOSTIC_ASSERT(!mPreloadedSheet->mLoaded);
mPreloadedSheet->mLoaded = true;
if (NS_FAILED(aStatus)) {
mPromise->MaybeReject(aStatus);
} else {
mPromise->MaybeResolve(mPreloadedSheet);
}
return NS_OK;
}
// Note: After calling this method, the preloaded sheet *must not* be used
// until the observer is notified that the sheet has finished loading.
nsresult PreloadedStyleSheet::PreloadAsync(NotNull<dom::Promise*> aPromise) {
MOZ_DIAGNOSTIC_ASSERT(!mLoaded);
auto loader = MakeRefPtr<css::Loader>();
auto obs = MakeRefPtr<StylesheetPreloadObserver>(aPromise, this);
auto result = loader->LoadSheet(mURI, mParsingMode,
css::Loader::UseSystemPrincipal::No, obs);
if (result.isErr()) {
return result.unwrapErr();
}
mSheet = result.unwrap();
return NS_OK;
}
} // namespace mozilla
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