/* -*- 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 "nsMeterFrame.h"

#include "nsIContent.h"

#include "nsPresContext.h"

#include "nsGkAtoms.h"

#include "nsNameSpaceManager.h"

#include "nsIDocument.h"

#include "nsIPresShell.h"

#include "nsNodeInfoManager.h"

#include "nsContentCreatorFunctions.h"

#include "nsCheckboxRadioFrame.h"

#include "nsFontMetrics.h"

#include "mozilla/dom/Element.h"

#include "mozilla/dom/HTMLMeterElement.h"

#include "nsCSSPseudoElements.h"

#include "nsStyleConsts.h"

#include <algorithm>

using namespace mozilla;

using mozilla::dom::Element;

using mozilla::dom::HTMLMeterElement;

nsIFrame*

NS_NewMeterFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle)

{

  return new (aPresShell) nsMeterFrame(aStyle);

}

NS_IMPL_FRAMEARENA_HELPERS(nsMeterFrame)

nsMeterFrame::nsMeterFrame(ComputedStyle* aStyle)

  : nsContainerFrame(aStyle, kClassID)

  , mBarDiv(nullptr)

{

}

nsMeterFrame::~nsMeterFrame()

{

}

void

nsMeterFrame::DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData)

{

  NS_ASSERTION(!GetPrevContinuation(),

               "nsMeterFrame should not have continuations; if it does we "

               "need to call RegUnregAccessKey only for the first.");

  nsCheckboxRadioFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);

  aPostDestroyData.AddAnonymousContent(mBarDiv.forget());

  nsContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData);

}

nsresult

nsMeterFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)

{

  // Get the NodeInfoManager and tag necessary to create the meter bar div.

  nsCOMPtr<nsIDocument> doc = mContent->GetComposedDoc();

  // Create the div.

  mBarDiv = doc->CreateHTMLElement(nsGkAtoms::div);

  // Associate ::-moz-meter-bar pseudo-element to the anonymous child.

  mBarDiv->SetPseudoElementType(CSSPseudoElementType::mozMeterBar);

  aElements.AppendElement(mBarDiv);

  return NS_OK;

}

void

nsMeterFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,

                                       uint32_t aFilter)

{

  if (mBarDiv) {

    aElements.AppendElement(mBarDiv);

  }

}

NS_QUERYFRAME_HEAD(nsMeterFrame)

  NS_QUERYFRAME_ENTRY(nsMeterFrame)

  NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)

NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

void

nsMeterFrame::Reflow(nsPresContext*           aPresContext,

                     ReflowOutput&     aDesiredSize,

                     const ReflowInput& aReflowInput,

                     nsReflowStatus&          aStatus)

{

  MarkInReflow();

  DO_GLOBAL_REFLOW_COUNT("nsMeterFrame");

  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);

  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  NS_ASSERTION(mBarDiv, "Meter bar div must exist!");

  NS_ASSERTION(!GetPrevContinuation(),

               "nsMeterFrame should not have continuations; if it does we "

               "need to call RegUnregAccessKey only for the first.");

  if (mState & NS_FRAME_FIRST_REFLOW) {

    nsCheckboxRadioFrame::RegUnRegAccessKey(this, true);

  }

  nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();

  NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");

  ReflowBarFrame(barFrame, aPresContext, aReflowInput, aStatus);

  aDesiredSize.SetSize(aReflowInput.GetWritingMode(),

                       aReflowInput.ComputedSizeWithBorderPadding());

  aDesiredSize.SetOverflowAreasToDesiredBounds();

  ConsiderChildOverflow(aDesiredSize.mOverflowAreas, barFrame);

  FinishAndStoreOverflow(&aDesiredSize);

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

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);

}

void

nsMeterFrame::ReflowBarFrame(nsIFrame*                aBarFrame,

                             nsPresContext*           aPresContext,

                             const ReflowInput& aReflowInput,

                             nsReflowStatus&          aStatus)

{

  bool vertical = ResolvedOrientationIsVertical();

  WritingMode wm = aBarFrame->GetWritingMode();

  LogicalSize availSize = aReflowInput.ComputedSize(wm);

  availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;

  ReflowInput reflowInput(aPresContext, aReflowInput,

                                aBarFrame, availSize);

  nscoord size = vertical ? aReflowInput.ComputedHeight()

                          : aReflowInput.ComputedWidth();

  nscoord xoffset = aReflowInput.ComputedPhysicalBorderPadding().left;

  nscoord yoffset = aReflowInput.ComputedPhysicalBorderPadding().top;

  // NOTE: Introduce a new function getPosition in the content part ?

  HTMLMeterElement* meterElement = static_cast<HTMLMeterElement*>(GetContent());

  double max = meterElement->Max();

  double min = meterElement->Min();

  double value = meterElement->Value();

  double position = max - min;

  position = position != 0 ? (value - min) / position : 1;

  size = NSToCoordRound(size * position);

  if (!vertical && (wm.IsVertical() ? wm.IsVerticalRL() : !wm.IsBidiLTR())) {

    xoffset += aReflowInput.ComputedWidth() - size;

  }

  // The bar position is *always* constrained.

  if (vertical) {

    // We want the bar to begin at the bottom.

    yoffset += aReflowInput.ComputedHeight() - 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);

  }

  xoffset += reflowInput.ComputedPhysicalMargin().left;

  yoffset += reflowInput.ComputedPhysicalMargin().top;

  ReflowOutput barDesiredSize(reflowInput);

  ReflowChild(aBarFrame, aPresContext, barDesiredSize, reflowInput, xoffset,

              yoffset, 0, aStatus);

  FinishReflowChild(aBarFrame, aPresContext, barDesiredSize, &reflowInput,

                    xoffset, yoffset, 0);

}

nsresult

nsMeterFrame::AttributeChanged(int32_t  aNameSpaceID,

                               nsAtom* aAttribute,

                               int32_t  aModType)

{

  NS_ASSERTION(mBarDiv, "Meter bar div must exist!");

  if (aNameSpaceID == kNameSpaceID_None &&

      (aAttribute == nsGkAtoms::value ||

       aAttribute == nsGkAtoms::max   ||

       aAttribute == nsGkAtoms::min )) {

    nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();

    NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");

    PresShell()->FrameNeedsReflow(barFrame, nsIPresShell::eResize,

                                  NS_FRAME_IS_DIRTY);

    InvalidateFrame();

  }

  return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,

                                            aModType);

}

LogicalSize

nsMeterFrame::ComputeAutoSize(gfxContext*         aRenderingContext,

                              WritingMode         aWM,

                              const LogicalSize&  aCBSize,

                              nscoord             aAvailableISize,

                              const LogicalSize&  aMargin,

                              const LogicalSize&  aBorder,

                              const LogicalSize&  aPadding,

                              ComputeSizeFlags    aFlags)

{

  RefPtr<nsFontMetrics> fontMet =

    nsLayoutUtils::GetFontMetricsForFrame(this, 1.0f);

  const WritingMode wm = GetWritingMode();

  LogicalSize autoSize(wm);

  autoSize.BSize(wm) = autoSize.ISize(wm) = fontMet->Font().size; // 1em

  if (ResolvedOrientationIsVertical() == wm.IsVertical()) {

    autoSize.ISize(wm) *= 5; // 5em

  } else {

    autoSize.BSize(wm) *= 5; // 5em

  }

  return autoSize.ConvertTo(aWM, wm);

}

nscoord

nsMeterFrame::GetMinISize(gfxContext *aRenderingContext)

{

  RefPtr<nsFontMetrics> fontMet =

    nsLayoutUtils::GetFontMetricsForFrame(this, 1.0f);

  nscoord minISize = fontMet->Font().size; // 1em

  if (ResolvedOrientationIsVertical() == GetWritingMode().IsVertical()) {

    // The orientation is inline

    minISize *= 5; // 5em

  }

  return minISize;

}

nscoord

nsMeterFrame::GetPrefISize(gfxContext *aRenderingContext)

{

  return GetMinISize(aRenderingContext);

}

bool

nsMeterFrame::ShouldUseNativeStyle() const

{

  nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();

  // 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()->mAppearance == StyleAppearance::Meterbar &&

         !PresContext()->HasAuthorSpecifiedRules(this,

                                                 NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND) &&

         barFrame &&

         barFrame->StyleDisplay()->mAppearance == StyleAppearance::Meterchunk &&

         !PresContext()->HasAuthorSpecifiedRules(barFrame,

                                                 NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND);

}