зеркало из https://github.com/mozilla/gecko-dev.git
500 строки
19 KiB
C++
500 строки
19 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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/*
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* rendering object that is the root of the frame tree, which contains
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* the document's scrollbars and contains fixed-positioned elements
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*/
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#include "mozilla/ViewportFrame.h"
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#include "mozilla/ComputedStyleInlines.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/ProfilerLabels.h"
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#include "mozilla/RestyleManager.h"
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#include "nsGkAtoms.h"
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#include "nsIScrollableFrame.h"
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#include "nsAbsoluteContainingBlock.h"
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#include "nsCanvasFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsSubDocumentFrame.h"
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#include "nsIMozBrowserFrame.h"
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#include "nsPlaceholderFrame.h"
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#include "MobileViewportManager.h"
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using namespace mozilla;
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typedef nsAbsoluteContainingBlock::AbsPosReflowFlags AbsPosReflowFlags;
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ViewportFrame* NS_NewViewportFrame(PresShell* aPresShell,
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ComputedStyle* aStyle) {
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return new (aPresShell) ViewportFrame(aStyle, aPresShell->GetPresContext());
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}
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NS_IMPL_FRAMEARENA_HELPERS(ViewportFrame)
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NS_QUERYFRAME_HEAD(ViewportFrame)
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NS_QUERYFRAME_ENTRY(ViewportFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
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void ViewportFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) {
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nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
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// No need to call CreateView() here - the frame ctor will call SetView()
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// with the ViewManager's root view, so we'll assign it in SetViewInternal().
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nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(this);
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if (parent) {
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nsFrameState state = parent->GetStateBits();
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AddStateBits(state & (NS_FRAME_IN_POPUP));
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}
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}
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void ViewportFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) {
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AUTO_PROFILER_LABEL("ViewportFrame::BuildDisplayList",
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GRAPHICS_DisplayListBuilding);
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nsIFrame* kid = mFrames.FirstChild();
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if (!kid) {
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return;
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}
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nsDisplayListCollection set(aBuilder);
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BuildDisplayListForChild(aBuilder, kid, set);
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// If we have a scrollframe then it takes care of creating the display list
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// for the top layer, but otherwise we need to do it here.
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if (!kid->IsScrollFrame()) {
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bool isOpaque = false;
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if (auto* list = BuildDisplayListForTopLayer(aBuilder, &isOpaque)) {
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if (isOpaque) {
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set.DeleteAll(aBuilder);
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}
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set.PositionedDescendants()->AppendToTop(list);
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}
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}
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set.MoveTo(aLists);
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}
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#ifdef DEBUG
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/**
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* Returns whether we are going to put an element in the top layer for
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* fullscreen. This function should matches the CSS rule in ua.css.
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*/
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static bool ShouldInTopLayerForFullscreen(dom::Element* aElement) {
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if (!aElement->GetParent()) {
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return false;
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}
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nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(aElement);
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if (browserFrame && browserFrame->GetReallyIsBrowser()) {
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return false;
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}
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return true;
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}
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#endif // DEBUG
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static void BuildDisplayListForTopLayerFrame(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame,
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nsDisplayList* aList) {
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nsRect visible;
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nsRect dirty;
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DisplayListClipState::AutoSaveRestore clipState(aBuilder);
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nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(aBuilder);
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nsDisplayListBuilder::OutOfFlowDisplayData* savedOutOfFlowData =
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nsDisplayListBuilder::GetOutOfFlowData(aFrame);
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if (savedOutOfFlowData) {
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visible =
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savedOutOfFlowData->GetVisibleRectForFrame(aBuilder, aFrame, &dirty);
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// This function is called after we've finished building display items for
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// the root scroll frame. That means that the content clip from the root
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// scroll frame is no longer on aBuilder. However, we need to make sure
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// that the display items we build in this function have finite clipped
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// bounds with respect to the root ASR, so we restore the *combined clip*
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// that we saved earlier. The combined clip will include the clip from the
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// root scroll frame.
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clipState.SetClipChainForContainingBlockDescendants(
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savedOutOfFlowData->mCombinedClipChain);
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asrSetter.SetCurrentActiveScrolledRoot(
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savedOutOfFlowData->mContainingBlockActiveScrolledRoot);
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asrSetter.SetCurrentScrollParentId(savedOutOfFlowData->mScrollParentId);
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}
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nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
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aBuilder, aFrame, visible, dirty);
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nsDisplayList list(aBuilder);
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aFrame->BuildDisplayListForStackingContext(aBuilder, &list);
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aList->AppendToTop(&list);
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}
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static bool BackdropListIsOpaque(ViewportFrame* aFrame,
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nsDisplayListBuilder* aBuilder,
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nsDisplayList* aList) {
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// The common case for ::backdrop elements on the top layer is a single
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// fixed position container, holding an opaque background color covering
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// the whole viewport.
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if (aList->Length() != 1 ||
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aList->GetTop()->GetType() != DisplayItemType::TYPE_FIXED_POSITION) {
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return false;
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}
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// Make sure the fixed position container isn't clipped or scrollable.
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nsDisplayFixedPosition* fixed =
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static_cast<nsDisplayFixedPosition*>(aList->GetTop());
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if (fixed->GetActiveScrolledRoot() || fixed->GetClipChain()) {
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return false;
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}
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nsDisplayList* children = fixed->GetChildren();
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if (!children->GetTop() ||
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children->GetTop()->GetType() != DisplayItemType::TYPE_BACKGROUND_COLOR) {
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return false;
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}
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nsDisplayBackgroundColor* child =
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static_cast<nsDisplayBackgroundColor*>(children->GetTop());
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if (child->GetActiveScrolledRoot() || child->GetClipChain()) {
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return false;
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}
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// Check that the background color is both opaque, and covering the
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// whole viewport.
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bool dummy;
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nsRegion opaque = child->GetOpaqueRegion(aBuilder, &dummy);
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return opaque.Contains(aFrame->GetRect());
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}
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nsDisplayWrapList* ViewportFrame::BuildDisplayListForTopLayer(
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nsDisplayListBuilder* aBuilder, bool* aIsOpaque) {
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nsDisplayList topLayerList(aBuilder);
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nsTArray<dom::Element*> topLayer = PresContext()->Document()->GetTopLayer();
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for (dom::Element* elem : topLayer) {
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nsIFrame* frame = elem->GetPrimaryFrame();
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if (!frame) {
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continue;
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}
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if (frame->IsHiddenByContentVisibilityOnAnyAncestor(
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nsIFrame::IncludeContentVisibility::Hidden)) {
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continue;
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}
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// There are two cases where an element in fullscreen is not in
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// the top layer:
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// 1. When building display list for purpose other than painting,
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// it is possible that there is inconsistency between the style
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// info and the content tree.
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// 2. This is an element which we are not going to put in the top
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// layer for fullscreen. See ShouldInTopLayerForFullscreen().
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// In both cases, we want to skip the frame here and paint it in
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// the normal path.
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if (frame->StyleDisplay()->mTopLayer == StyleTopLayer::None) {
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MOZ_ASSERT(!aBuilder->IsForPainting() ||
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!ShouldInTopLayerForFullscreen(elem));
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continue;
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}
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MOZ_ASSERT(ShouldInTopLayerForFullscreen(elem));
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// Inner SVG, MathML elements, as well as children of some XUL
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// elements are not allowed to be out-of-flow. They should not
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// be handled as top layer element here.
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if (!frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
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MOZ_ASSERT(!elem->GetParent()->IsHTMLElement(),
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"HTML element should always be out-of-flow if in the top "
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"layer");
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continue;
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}
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if (nsIFrame* backdropPh =
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frame->GetChildList(FrameChildListID::Backdrop).FirstChild()) {
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MOZ_ASSERT(!backdropPh->GetNextSibling(), "more than one ::backdrop?");
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MOZ_ASSERT(backdropPh->HasAnyStateBits(NS_FRAME_FIRST_REFLOW),
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"did you intend to reflow ::backdrop placeholders?");
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nsIFrame* backdropFrame =
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nsPlaceholderFrame::GetRealFrameForPlaceholder(backdropPh);
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BuildDisplayListForTopLayerFrame(aBuilder, backdropFrame, &topLayerList);
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if (aIsOpaque) {
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*aIsOpaque = BackdropListIsOpaque(this, aBuilder, &topLayerList);
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}
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}
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BuildDisplayListForTopLayerFrame(aBuilder, frame, &topLayerList);
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}
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if (nsCanvasFrame* canvasFrame = PresShell()->GetCanvasFrame()) {
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if (dom::Element* container = canvasFrame->GetCustomContentContainer()) {
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if (nsIFrame* frame = container->GetPrimaryFrame()) {
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MOZ_ASSERT(frame->StyleDisplay()->mTopLayer != StyleTopLayer::None,
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"ua.css should ensure this");
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MOZ_ASSERT(frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW));
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BuildDisplayListForTopLayerFrame(aBuilder, frame, &topLayerList);
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}
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}
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}
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if (topLayerList.IsEmpty()) {
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return nullptr;
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}
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nsPoint offset = aBuilder->GetCurrentFrame()->GetOffsetTo(this);
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nsDisplayListBuilder::AutoBuildingDisplayList buildingDisplayList(
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aBuilder, this, aBuilder->GetVisibleRect() + offset,
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aBuilder->GetDirtyRect() + offset);
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// Wrap the whole top layer in a single item with maximum z-index,
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// and append it at the very end, so that it stays at the topmost.
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nsDisplayWrapList* wrapList = MakeDisplayItemWithIndex<nsDisplayWrapper>(
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aBuilder, this, 2, &topLayerList, aBuilder->CurrentActiveScrolledRoot(),
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false);
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if (!wrapList) {
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return nullptr;
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}
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wrapList->SetOverrideZIndex(
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std::numeric_limits<decltype(wrapList->ZIndex())>::max());
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return wrapList;
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}
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#ifdef DEBUG
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void ViewportFrame::AppendFrames(ChildListID aListID,
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nsFrameList&& aFrameList) {
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NS_ASSERTION(aListID == FrameChildListID::Principal, "unexpected child list");
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NS_ASSERTION(GetChildList(aListID).IsEmpty(), "Shouldn't have any kids!");
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nsContainerFrame::AppendFrames(aListID, std::move(aFrameList));
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}
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void ViewportFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
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const nsLineList::iterator* aPrevFrameLine,
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nsFrameList&& aFrameList) {
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NS_ASSERTION(aListID == FrameChildListID::Principal, "unexpected child list");
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NS_ASSERTION(GetChildList(aListID).IsEmpty(), "Shouldn't have any kids!");
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nsContainerFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
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std::move(aFrameList));
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}
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void ViewportFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) {
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NS_ASSERTION(aListID == FrameChildListID::Principal, "unexpected child list");
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nsContainerFrame::RemoveFrame(aListID, aOldFrame);
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}
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#endif
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/* virtual */
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nscoord ViewportFrame::GetMinISize(gfxContext* aRenderingContext) {
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nscoord result;
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DISPLAY_MIN_INLINE_SIZE(this, result);
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if (mFrames.IsEmpty())
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result = 0;
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else
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result = mFrames.FirstChild()->GetMinISize(aRenderingContext);
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return result;
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}
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/* virtual */
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nscoord ViewportFrame::GetPrefISize(gfxContext* aRenderingContext) {
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nscoord result;
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DISPLAY_PREF_INLINE_SIZE(this, result);
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if (mFrames.IsEmpty())
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result = 0;
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else
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result = mFrames.FirstChild()->GetPrefISize(aRenderingContext);
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return result;
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}
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nsPoint ViewportFrame::AdjustReflowInputForScrollbars(
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ReflowInput* aReflowInput) const {
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// Get our prinicpal child frame and see if we're scrollable
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nsIFrame* kidFrame = mFrames.FirstChild();
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nsIScrollableFrame* scrollingFrame = do_QueryFrame(kidFrame);
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if (scrollingFrame) {
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WritingMode wm = aReflowInput->GetWritingMode();
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LogicalMargin scrollbars(wm, scrollingFrame->GetActualScrollbarSizes());
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aReflowInput->SetComputedISize(
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aReflowInput->ComputedISize() - scrollbars.IStartEnd(wm),
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ReflowInput::ResetResizeFlags::No);
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aReflowInput->SetAvailableISize(aReflowInput->AvailableISize() -
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scrollbars.IStartEnd(wm));
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aReflowInput->SetComputedBSize(
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aReflowInput->ComputedBSize() - scrollbars.BStartEnd(wm),
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ReflowInput::ResetResizeFlags::No);
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return nsPoint(scrollbars.Left(wm), scrollbars.Top(wm));
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}
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return nsPoint(0, 0);
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}
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nsRect ViewportFrame::AdjustReflowInputAsContainingBlock(
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ReflowInput* aReflowInput) const {
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#ifdef DEBUG
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nsPoint offset =
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#endif
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AdjustReflowInputForScrollbars(aReflowInput);
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NS_ASSERTION(GetAbsoluteContainingBlock()->GetChildList().IsEmpty() ||
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(offset.x == 0 && offset.y == 0),
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"We don't handle correct positioning of fixed frames with "
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"scrollbars in odd positions");
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nsRect rect(0, 0, aReflowInput->ComputedWidth(),
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aReflowInput->ComputedHeight());
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rect.SizeTo(AdjustViewportSizeForFixedPosition(rect));
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return rect;
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}
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void ViewportFrame::Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) {
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MarkInReflow();
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DO_GLOBAL_REFLOW_COUNT("ViewportFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
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MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
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NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");
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// Because |Reflow| sets ComputedBSize() on the child to our
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// ComputedBSize().
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AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
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// Set our size up front, since some parts of reflow depend on it
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// being already set. Note that the computed height may be
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// unconstrained; that's ok. Consumers should watch out for that.
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SetSize(nsSize(aReflowInput.ComputedWidth(), aReflowInput.ComputedHeight()));
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// Reflow the main content first so that the placeholders of the
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// fixed-position frames will be in the right places on an initial
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// reflow.
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nscoord kidBSize = 0;
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WritingMode wm = aReflowInput.GetWritingMode();
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if (mFrames.NotEmpty()) {
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// Deal with a non-incremental reflow or an incremental reflow
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// targeted at our one-and-only principal child frame.
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if (aReflowInput.ShouldReflowAllKids() ||
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mFrames.FirstChild()->IsSubtreeDirty()) {
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// Reflow our one-and-only principal child frame
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nsIFrame* kidFrame = mFrames.FirstChild();
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ReflowOutput kidDesiredSize(aReflowInput);
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const WritingMode kidWM = kidFrame->GetWritingMode();
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LogicalSize availableSpace = aReflowInput.AvailableSize(kidWM);
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ReflowInput kidReflowInput(aPresContext, aReflowInput, kidFrame,
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availableSpace);
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// Reflow the frame
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kidReflowInput.SetComputedBSize(aReflowInput.ComputedBSize());
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ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowInput, 0, 0,
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ReflowChildFlags::Default, aStatus);
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kidBSize = kidDesiredSize.BSize(wm);
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FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, &kidReflowInput,
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0, 0, ReflowChildFlags::Default);
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} else {
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kidBSize = LogicalSize(wm, mFrames.FirstChild()->GetSize()).BSize(wm);
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}
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}
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NS_ASSERTION(aReflowInput.AvailableISize() != NS_UNCONSTRAINEDSIZE,
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"shouldn't happen anymore");
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// Return the max size as our desired size
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LogicalSize maxSize(wm, aReflowInput.AvailableISize(),
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// Being flowed initially at an unconstrained block size
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// means we should return our child's intrinsic size.
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aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE
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? aReflowInput.ComputedBSize()
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: kidBSize);
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aDesiredSize.SetSize(wm, maxSize);
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aDesiredSize.SetOverflowAreasToDesiredBounds();
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if (HasAbsolutelyPositionedChildren()) {
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// Make a copy of the reflow input and change the computed width and height
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// to reflect the available space for the fixed items
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ReflowInput reflowInput(aReflowInput);
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if (reflowInput.AvailableBSize() == NS_UNCONSTRAINEDSIZE) {
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// We have an intrinsic-block-size document with abs-pos/fixed-pos
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// children. Set the available block-size and computed block-size to our
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// chosen block-size.
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reflowInput.SetAvailableBSize(maxSize.BSize(wm));
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// Not having border/padding simplifies things
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NS_ASSERTION(
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reflowInput.ComputedPhysicalBorderPadding() == nsMargin(0, 0, 0, 0),
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"Viewports can't have border/padding");
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reflowInput.SetComputedBSize(maxSize.BSize(wm));
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}
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nsRect rect = AdjustReflowInputAsContainingBlock(&reflowInput);
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AbsPosReflowFlags flags =
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AbsPosReflowFlags::CBWidthAndHeightChanged; // XXX could be optimized
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GetAbsoluteContainingBlock()->Reflow(this, aPresContext, reflowInput,
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aStatus, rect, flags,
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/* aOverflowAreas = */ nullptr);
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}
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if (mFrames.NotEmpty()) {
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ConsiderChildOverflow(aDesiredSize.mOverflowAreas, mFrames.FirstChild());
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}
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// If we were dirty then do a repaint
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if (HasAnyStateBits(NS_FRAME_IS_DIRTY)) {
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InvalidateFrame();
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}
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// Clipping is handled by the document container (e.g., nsSubDocumentFrame),
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// so we don't need to change our overflow areas.
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FinishAndStoreOverflow(&aDesiredSize);
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NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
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}
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void ViewportFrame::UpdateStyle(ServoRestyleState& aRestyleState) {
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RefPtr<ComputedStyle> newStyle =
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aRestyleState.StyleSet().ResolveInheritingAnonymousBoxStyle(
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Style()->GetPseudoType(), nullptr);
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MOZ_ASSERT(!GetNextContinuation(), "Viewport has continuations?");
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SetComputedStyle(newStyle);
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UpdateStyleOfOwnedAnonBoxes(aRestyleState);
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}
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void ViewportFrame::AppendDirectlyOwnedAnonBoxes(
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nsTArray<OwnedAnonBox>& aResult) {
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if (mFrames.NotEmpty()) {
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aResult.AppendElement(mFrames.FirstChild());
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}
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}
|
|
|
|
nsSize ViewportFrame::AdjustViewportSizeForFixedPosition(
|
|
const nsRect& aViewportRect) const {
|
|
nsSize result = aViewportRect.Size();
|
|
|
|
mozilla::PresShell* presShell = PresShell();
|
|
// Layout fixed position elements to the visual viewport size if and only if
|
|
// it has been set and it is larger than the computed size, otherwise use the
|
|
// computed size.
|
|
if (presShell->IsVisualViewportSizeSet()) {
|
|
if (presShell->GetDynamicToolbarState() == DynamicToolbarState::Collapsed &&
|
|
result < presShell->GetVisualViewportSizeUpdatedByDynamicToolbar()) {
|
|
// We need to use the viewport size updated by the dynamic toolbar in the
|
|
// case where the dynamic toolbar is completely hidden.
|
|
result = presShell->GetVisualViewportSizeUpdatedByDynamicToolbar();
|
|
} else if (result < presShell->GetVisualViewportSize()) {
|
|
result = presShell->GetVisualViewportSize();
|
|
}
|
|
}
|
|
// Expand the size to the layout viewport size if necessary.
|
|
const nsSize layoutViewportSize = presShell->GetLayoutViewportSize();
|
|
if (result < layoutViewportSize) {
|
|
result = layoutViewportSize;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
nsresult ViewportFrame::GetFrameName(nsAString& aResult) const {
|
|
return MakeFrameName(u"Viewport"_ns, aResult);
|
|
}
|
|
#endif
|