зеркало из https://github.com/mozilla/gecko-dev.git
111 строки
4.3 KiB
C++
111 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_AutoPrintEventDispatcher_h
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#define mozilla_dom_AutoPrintEventDispatcher_h
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/DocumentInlines.h"
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#include "nsContentUtils.h"
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#include "nsIPrintSettings.h"
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namespace mozilla::dom {
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class AutoPrintEventDispatcher {
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// NOTE(emilio): For fission iframes, we dispatch this event in
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// RecvCloneDocumentTreeIntoSelf.
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static void CollectInProcessSubdocuments(
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Document& aDoc, nsTArray<std::pair<nsCOMPtr<Document>, bool>>& aDocs) {
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auto recurse = [&aDocs](Document& aSubDoc) {
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aDocs.AppendElement(std::make_pair(&aSubDoc, false));
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CollectInProcessSubdocuments(aSubDoc, aDocs);
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return CallState::Continue;
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};
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aDoc.EnumerateSubDocuments(recurse);
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}
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MOZ_CAN_RUN_SCRIPT void DispatchEvent(bool aBefore) {
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for (auto& [doc, isTop] : mDocuments) {
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nsContentUtils::DispatchTrustedEvent(
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doc, doc->GetWindow(), aBefore ? u"beforeprint"_ns : u"afterprint"_ns,
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CanBubble::eNo, Cancelable::eNo, nullptr);
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if (RefPtr<nsPresContext> presContext = doc->GetPresContext()) {
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presContext->EmulateMedium(aBefore ? nsGkAtoms::print : nullptr);
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bool needResizeEvent = false;
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if (isTop) {
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// NOTE(emilio): Having this code here means that we only fire the
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// resize on the initial document clone, not on any further print
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// settings changes. This is an intentional trade-off.
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//
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// On a continuously changing document, we don't want to keep
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// re-cloning every time the user changes the print settings, as it
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// changes what you're printing.
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if (aBefore) {
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mVisibleAreaToRestore = presContext->GetVisibleArea();
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presContext->SetVisibleArea(
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nsRect(mVisibleAreaToRestore.TopLeft(), mPageSize));
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needResizeEvent = mVisibleAreaToRestore.Size() != mPageSize;
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} else {
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if (presContext->GetVisibleArea().Size() == mPageSize) {
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presContext->SetVisibleArea(mVisibleAreaToRestore);
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needResizeEvent = mVisibleAreaToRestore.Size() != mPageSize;
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} else {
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// This shouldn't happen, but can if used by privileged script,
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// like in test_printpreview.xhtml. It's ok to do nothing here
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// tho, we just need to make sure that the mPageSize viewport size
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// doesn't persist.
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NS_WARNING(
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"Something changed our viewport size between firing "
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"before/afterprint?");
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}
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}
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}
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// Ensure media query listeners fire.
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doc->FlushPendingNotifications(FlushType::Style);
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if (needResizeEvent) {
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if (RefPtr ps = presContext->GetPresShell()) {
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ps->FireResizeEventSync();
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}
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}
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}
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}
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}
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static nsSize ComputePrintPageSize(nsIPrintSettings* aPrintSettings) {
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double pageWidth = 0;
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double pageHeight = 0;
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aPrintSettings->GetEffectivePageSize(&pageWidth, &pageHeight);
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return nsSize(nsPresContext::CSSTwipsToAppUnits(NSToIntFloor(pageWidth)),
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nsPresContext::CSSTwipsToAppUnits(NSToIntFloor(pageHeight)));
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}
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public:
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MOZ_CAN_RUN_SCRIPT AutoPrintEventDispatcher(Document& aDoc,
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nsIPrintSettings* aPrintSettings,
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bool aIsTop)
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: mPageSize(ComputePrintPageSize(aPrintSettings)) {
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if (!aDoc.IsStaticDocument()) {
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mDocuments.AppendElement(std::make_pair(&aDoc, aIsTop));
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CollectInProcessSubdocuments(aDoc, mDocuments);
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}
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DispatchEvent(true);
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}
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MOZ_CAN_RUN_SCRIPT ~AutoPrintEventDispatcher() { DispatchEvent(false); }
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// The bool represents whether this is the top-level paginated document.
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AutoTArray<std::pair<nsCOMPtr<Document>, bool>, 8> mDocuments;
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const nsSize mPageSize;
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nsRect mVisibleAreaToRestore;
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};
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} // namespace mozilla::dom
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#endif
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