forked from mirrors/gecko-dev
89 lines
3.2 KiB
C++
89 lines
3.2 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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/* rendering object for CSS "::backdrop" */
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#include "nsBackdropFrame.h"
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#include "nsDisplayList.h"
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using namespace mozilla;
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NS_IMPL_FRAMEARENA_HELPERS(nsBackdropFrame)
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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 */ ComputedStyle*
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nsBackdropFrame::GetParentComputedStyle(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 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 == mozilla::StyleDisplay::None ||
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display == mozilla::StyleDisplay::Contents) {
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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(gfxContext* 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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ComputeSizeFlags aFlags)
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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 (aFlags & ComputeSizeFlags::eShrinkWrap) {
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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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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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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, aReflowInput, aDesiredSize, aStatus);
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MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
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// Note that this frame is a child of the viewport frame.
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WritingMode wm = aReflowInput.GetWritingMode();
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LogicalMargin borderPadding = aReflowInput.ComputedLogicalBorderPadding();
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nscoord isize = aReflowInput.ComputedISize() + borderPadding.IStartEnd(wm);
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nscoord bsize = aReflowInput.ComputedBSize() + borderPadding.BStartEnd(wm);
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aDesiredSize.SetSize(wm, LogicalSize(wm, isize, bsize));
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}
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