Quelle nsProgressFrame.cpp Sprache: C

/* -*- 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/. */

#include "nsProgressFrame.h"

#include "mozilla/PresShell.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLProgressElement.h"
#include "nsIContent.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "nsFontMetrics.h"
#include <algorithm>

using namespace mozilla;
using namespace mozilla::dom;

nsIFrame* NS_NewProgressFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
  return new (aPresShell) nsProgressFrame(aStyle, aPresShell->GetPresContext());
}

NS_IMPL_FRAMEARENA_HELPERS(nsProgressFrame)

nsProgressFrame::nsProgressFrame(ComputedStyle* aStyle,
                                 nsPresContext* aPresContext)
    : nsContainerFrame(aStyle, aPresContext, kClassID), mBarDiv(nullptr) {}

nsProgressFrame::~nsProgressFrame() = default;

void nsProgressFrame::Destroy(DestroyContext& aContext) {
  NS_ASSERTION(!GetPrevContinuation(),
               "nsProgressFrame should not have continuations; if it does we "
               "need to call RegUnregAccessKey only for the first.");
  aContext.AddAnonymousContent(mBarDiv.forget());
  nsContainerFrame::Destroy(aContext);
}

nsresult nsProgressFrame::CreateAnonymousContent(
    nsTArray<ContentInfo>& aElements) {
  // Create the progress bar div.
  nsCOMPtr<Document> doc = mContent->GetComposedDoc();
  mBarDiv = doc->CreateHTMLElement(nsGkAtoms::div);

  // Associate ::-moz-progress-bar pseudo-element to the anonymous child.
  if (StaticPrefs::layout_css_modern_range_pseudos_enabled()) {
    // TODO(emilio): Create also a slider-track pseudo-element.
    mBarDiv->SetPseudoElementType(PseudoStyleType::sliderFill);
  } else {
    mBarDiv->SetPseudoElementType(PseudoStyleType::mozProgressBar);
  }

  // XXX(Bug 1631371) Check if this should use a fallible operation as it
  // pretended earlier, or change the return type to void.
  aElements.AppendElement(mBarDiv);

  return NS_OK;
}

void nsProgressFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
                                               uint32_t aFilter) {
  if (mBarDiv) {
    aElements.AppendElement(mBarDiv);
  }
}

NS_QUERYFRAME_HEAD(nsProgressFrame)
  NS_QUERYFRAME_ENTRY(nsProgressFrame)
  NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

void nsProgressFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                       const nsDisplayListSet& aLists) {
  BuildDisplayListForInline(aBuilder, aLists);
}

void nsProgressFrame::Reflow(nsPresContext* aPresContext,
                             ReflowOutput& aDesiredSize,
                             const ReflowInput& aReflowInput,
                             nsReflowStatus& aStatus) {
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsProgressFrame");
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  NS_ASSERTION(mBarDiv, "Progress bar div must exist!");
  NS_ASSERTION(
      PrincipalChildList().GetLength() == 1 &&
          PrincipalChildList().FirstChild() == mBarDiv->GetPrimaryFrame(),
      "unexpected child frames");
  NS_ASSERTION(!GetPrevContinuation(),
               "nsProgressFrame should not have continuations; if it does we "
               "need to call RegUnregAccessKey only for the first.");

  const auto wm = aReflowInput.GetWritingMode();
  const auto contentBoxSize = aReflowInput.ComputedSizeWithBSizeFallback([&] {
    nscoord em = OneEmInAppUnits();
    return ResolvedOrientationIsVertical() == wm.IsVertical() ? em : 10 * em;
  });
  aDesiredSize.SetSize(
      wm,
      contentBoxSize + aReflowInput.ComputedLogicalBorderPadding(wm).Size(wm));
  aDesiredSize.SetOverflowAreasToDesiredBounds();

  for (nsIFrame* childFrame : PrincipalChildList()) {
    ReflowChildFrame(childFrame, aPresContext, aReflowInput, contentBoxSize,
                     aStatus);
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, childFrame);
  }

  FinishAndStoreOverflow(&aDesiredSize);

  aStatus.Reset();  // This type of frame can't be split.
}

void nsProgressFrame::ReflowChildFrame(nsIFrame* aChild,
                                       nsPresContext* aPresContext,
                                       const ReflowInput& aReflowInput,
                                       const LogicalSize& aParentContentBoxSize,
                                       nsReflowStatus& aStatus) {
  bool vertical = ResolvedOrientationIsVertical();
  const WritingMode wm = aChild->GetWritingMode();
  const LogicalSize parentSizeInChildWM =
      aParentContentBoxSize.ConvertTo(wm, aReflowInput.GetWritingMode());
  const nsSize parentPhysicalSize = parentSizeInChildWM.GetPhysicalSize(wm);
  LogicalSize availSize = parentSizeInChildWM;
  availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
  ReflowInput reflowInput(aPresContext, aReflowInput, aChild, availSize,
                          Some(parentSizeInChildWM));
  nscoord size =
      vertical ? parentPhysicalSize.Height() : parentPhysicalSize.Width();
  nscoord xoffset = aReflowInput.ComputedPhysicalBorderPadding().left;
  nscoord yoffset = aReflowInput.ComputedPhysicalBorderPadding().top;

  double position = static_cast<HTMLProgressElement*>(GetContent())->Position();

  // Force the bar's size to match the current progress.
  // When indeterminate, the progress' size will be 100%.
  if (position >= 0.0) {
    size *= position;
  }

  if (!vertical && wm.IsPhysicalRTL()) {
    xoffset += parentPhysicalSize.Width() - size;
  }

  // The bar size is fixed in these cases:
  // - the progress position is determined: the bar size is fixed according
  //   to it's value.
  // - the progress position is indeterminate and the bar appearance should be
  //   shown as native: the bar size is forced to 100%.
  // Otherwise (when the progress is indeterminate and the bar appearance isn't
  // native), the bar size isn't fixed and can be set by the author.
  if (position != -1 || ShouldUseNativeStyle()) {
    if (vertical) {
      // We want the bar to begin at the bottom.
      yoffset += parentPhysicalSize.Height() - size;
      size -= reflowInput.ComputedPhysicalMargin().TopBottom() +
              reflowInput.ComputedPhysicalBorderPadding().TopBottom();
      size = std::max(size, 0);
      reflowInput.SetComputedHeight(size);
    } else {
      size -= reflowInput.ComputedPhysicalMargin().LeftRight() +
              reflowInput.ComputedPhysicalBorderPadding().LeftRight();
      size = std::max(size, 0);
      reflowInput.SetComputedWidth(size);
    }
  } else if (vertical) {
    // For vertical progress bars, we need to position the bar specifically when
    // the width isn't constrained (position == -1 and !ShouldUseNativeStyle())
    // because parentPhysiscalSize.Height() - size == 0.
    // FIXME(emilio): This assumes that the bar's height is constrained, which
    // seems like a wrong assumption?
    yoffset += parentPhysicalSize.Height() - reflowInput.ComputedHeight();
  }

  xoffset += reflowInput.ComputedPhysicalMargin().left;
  yoffset += reflowInput.ComputedPhysicalMargin().top;

  ReflowOutput barDesiredSize(aReflowInput);
  ReflowChild(aChild, aPresContext, barDesiredSize, reflowInput, xoffset,
              yoffset, ReflowChildFlags::Default, aStatus);
  FinishReflowChild(aChild, aPresContext, barDesiredSize, &reflowInput, xoffset,
                    yoffset, ReflowChildFlags::Default);
}

nsresult nsProgressFrame::AttributeChanged(int32_t aNameSpaceID,
                                           nsAtom* aAttribute,
                                           int32_t aModType) {
  NS_ASSERTION(mBarDiv, "Progress bar div must exist!");

  if (aNameSpaceID == kNameSpaceID_None &&
      (aAttribute == nsGkAtoms::value || aAttribute == nsGkAtoms::max)) {
    auto presShell = PresShell();
    for (auto childFrame : PrincipalChildList()) {
      presShell->FrameNeedsReflow(childFrame, IntrinsicDirty::None,
                                  NS_FRAME_IS_DIRTY);
    }
    InvalidateFrame();
  }

  return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}

nscoord nsProgressFrame::IntrinsicISize(const IntrinsicSizeInput& aInput,
                                        IntrinsicISizeType aType) {
  nscoord iSize = OneEmInAppUnits();
  if (ResolvedOrientationIsVertical() == GetWritingMode().IsVertical()) {
    iSize *= 10;
  }
  return iSize;
}

bool nsProgressFrame::ShouldUseNativeStyle() const {
  nsIFrame* barFrame = PrincipalChildList().FirstChild();

  // Use the native style if these conditions are satisfied:
  // - both frames use the native appearance;
  // - neither frame has author specified rules setting the border or the
  //   background.
  return StyleDisplay()->EffectiveAppearance() ==
             StyleAppearance::ProgressBar &&
         !Style()->HasAuthorSpecifiedBorderOrBackground() && barFrame &&
         barFrame->StyleDisplay()->EffectiveAppearance() ==
             StyleAppearance::Progresschunk &&
         !barFrame->Style()->HasAuthorSpecifiedBorderOrBackground();
}

quality93%

¤ Dauer der Verarbeitung: 0.35 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.