зеркало из https://github.com/mozilla/gecko-dev.git
105 строки
3.6 KiB
C++
105 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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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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/* rendering object for CSS "::backdrop" */
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#include "nsBackdropFrame.h"
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using namespace mozilla;
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NS_IMPL_FRAMEARENA_HELPERS(nsBackdropFrame)
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/* virtual */ nsIAtom*
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nsBackdropFrame::GetType() const
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{
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return nsGkAtoms::backdropFrame;
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}
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsBackdropFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Backdrop"), aResult);
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}
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#endif
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/* virtual */ nsStyleContext*
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nsBackdropFrame::GetParentStyleContext(nsIFrame** aProviderFrame) const
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{
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// Style context of backdrop pseudo-element does not inherit from
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// any element, per the Fullscreen API spec.
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*aProviderFrame = nullptr;
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return nullptr;
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}
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/* virtual */ void
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nsBackdropFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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DO_GLOBAL_REFLOW_COUNT_DSP("nsBackdropFrame");
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// We want this frame to always be there even if its display value is
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// none or contents so that we can respond to style change on it. To
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// support those values, we skip painting ourselves in those cases.
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auto display = StyleDisplay()->mDisplay;
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if (display == NS_STYLE_DISPLAY_NONE ||
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display == NS_STYLE_DISPLAY_CONTENTS) {
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return;
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}
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// The WebVR specific render path in nsContainerLayerComposite
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// results in an alternating frame strobing effect when an nsBackdropFrame is
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// rendered.
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// Currently, VR content is composed of a fullscreen canvas element that
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// is expected to cover the entire viewport so a backdrop should not
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// be necessary.
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if (GetStateBits() & NS_FRAME_HAS_VR_CONTENT) {
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return;
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}
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DisplayBorderBackgroundOutline(aBuilder, aLists);
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}
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/* virtual */ LogicalSize
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nsBackdropFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
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WritingMode aWM,
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const LogicalSize& aCBSize,
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nscoord aAvailableISize,
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const LogicalSize& aMargin,
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const LogicalSize& aBorder,
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const LogicalSize& aPadding,
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bool aShrinkWrap)
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{
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// Note that this frame is a child of the viewport frame.
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LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
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if (aShrinkWrap) {
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result.ISize(aWM) = 0;
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} else {
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result.ISize(aWM) = aAvailableISize - aMargin.ISize(aWM) -
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aBorder.ISize(aWM) - aPadding.ISize(aWM);
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}
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return result;
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}
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/* virtual */ void
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nsBackdropFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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MarkInReflow();
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DO_GLOBAL_REFLOW_COUNT("nsBackdropFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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// Note that this frame is a child of the viewport frame.
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WritingMode wm = aReflowState.GetWritingMode();
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LogicalMargin borderPadding = aReflowState.ComputedLogicalBorderPadding();
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nscoord isize = aReflowState.ComputedISize() + borderPadding.IStartEnd(wm);
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nscoord bsize = aReflowState.ComputedBSize() + borderPadding.BStartEnd(wm);
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aDesiredSize.SetSize(wm, LogicalSize(wm, isize, bsize));
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aStatus = NS_FRAME_COMPLETE;
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}
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