gecko-dev/layout/xul/nsLeafBoxFrame.cpp

/* -*- 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/. */

//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//

#include "mozilla/ComputedStyle.h"
#include "mozilla/PresShell.h"
#include "nsLeafBoxFrame.h"
#include "nsBoxFrame.h"
#include "nsCOMPtr.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsNameSpaceManager.h"
#include "nsBoxLayoutState.h"
#include "nsWidgetsCID.h"
#include "nsViewManager.h"
#include "nsContainerFrame.h"
#include "nsDisplayList.h"
#include <algorithm>

using namespace mozilla;

//
// NS_NewLeafBoxFrame
//
// Creates a new Toolbar frame and returns it
//
nsIFrame* NS_NewLeafBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
  return new (aPresShell) nsLeafBoxFrame(aStyle, aPresShell->GetPresContext());
}

NS_IMPL_FRAMEARENA_HELPERS(nsLeafBoxFrame)

/**
 * Initialize us. This is a good time to get the alignment of the box
 */
void nsLeafBoxFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
                          nsIFrame* aPrevInFlow) {
  nsLeafFrame::Init(aContent, aParent, aPrevInFlow);

  if (GetStateBits() & NS_FRAME_FONT_INFLATION_CONTAINER) {
    AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
  }

  UpdateMouseThrough();
}

nsresult nsLeafBoxFrame::AttributeChanged(int32_t aNameSpaceID,
                                          nsAtom* aAttribute,
                                          int32_t aModType) {
  nsresult rv =
      nsLeafFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);

  if (aAttribute == nsGkAtoms::mousethrough) UpdateMouseThrough();

  return rv;
}

void nsLeafBoxFrame::UpdateMouseThrough() {
  static Element::AttrValuesArray strings[] = {nsGkAtoms::never,
                                               nsGkAtoms::always, nullptr};
  switch (mContent->AsElement()->FindAttrValueIn(
      kNameSpaceID_None, nsGkAtoms::mousethrough, strings, eCaseMatters)) {
    case 0:
      AddStateBits(NS_FRAME_MOUSE_THROUGH_NEVER);
      break;
    case 1:
      AddStateBits(NS_FRAME_MOUSE_THROUGH_ALWAYS);
      break;
    case 2: {
      RemoveStateBits(NS_FRAME_MOUSE_THROUGH_ALWAYS);
      RemoveStateBits(NS_FRAME_MOUSE_THROUGH_NEVER);
      break;
    }
  }
}

void nsLeafBoxFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                      const nsDisplayListSet& aLists) {
  // REVIEW: GetFrameForPoint used to not report events for the background
  // layer, whereas this code will put an event receiver for this frame in the
  // BlockBorderBackground() list. But I don't see any need to preserve
  // that anomalous behaviour. The important thing I'm preserving is that
  // leaf boxes continue to receive events in the foreground layer.
  DisplayBorderBackgroundOutline(aBuilder, aLists);

  if (!aBuilder->IsForEventDelivery() || !IsVisibleForPainting()) return;

  aLists.Content()->AppendNewToTop<nsDisplayEventReceiver>(aBuilder, this);
}

/* virtual */
nscoord nsLeafBoxFrame::GetMinISize(gfxContext* aRenderingContext) {
  nscoord result;
  DISPLAY_MIN_INLINE_SIZE(this, result);
  nsBoxLayoutState state(PresContext(), aRenderingContext);

  WritingMode wm = GetWritingMode();
  LogicalSize minSize(wm, GetXULMinSize(state));

  // GetXULMinSize returns border-box size, and we want to return content
  // inline-size.  Since Reflow uses the reflow input's border and padding, we
  // actually just want to subtract what GetXULMinSize added, which is the
  // result of GetXULBorderAndPadding.
  nsMargin bp;
  GetXULBorderAndPadding(bp);

  result = minSize.ISize(wm) - LogicalMargin(wm, bp).IStartEnd(wm);

  return result;
}

/* virtual */
nscoord nsLeafBoxFrame::GetPrefISize(gfxContext* aRenderingContext) {
  nscoord result;
  DISPLAY_PREF_INLINE_SIZE(this, result);
  nsBoxLayoutState state(PresContext(), aRenderingContext);

  WritingMode wm = GetWritingMode();
  LogicalSize prefSize(wm, GetXULPrefSize(state));

  // GetXULPrefSize returns border-box size, and we want to return content
  // inline-size.  Since Reflow uses the reflow input's border and padding, we
  // actually just want to subtract what GetXULPrefSize added, which is the
  // result of GetXULBorderAndPadding.
  nsMargin bp;
  GetXULBorderAndPadding(bp);

  result = prefSize.ISize(wm) - LogicalMargin(wm, bp).IStartEnd(wm);

  return result;
}

nscoord nsLeafBoxFrame::GetIntrinsicISize() {
  // No intrinsic width
  return 0;
}

LogicalSize nsLeafBoxFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
    const LogicalSize& aBorder, const LogicalSize& aPadding,
    ComputeSizeFlags aFlags) {
  // Important: NOT calling our direct superclass here!
  return nsFrame::ComputeAutoSize(aRenderingContext, aWM, aCBSize,
                                  aAvailableISize, aMargin, aBorder, aPadding,
                                  aFlags);
}

void nsLeafBoxFrame::Reflow(nsPresContext* aPresContext,
                            ReflowOutput& aDesiredSize,
                            const ReflowInput& aReflowInput,
                            nsReflowStatus& aStatus) {
  // This is mostly a copy of nsBoxFrame::Reflow().
  // We aren't able to share an implementation because of the frame
  // class hierarchy.  If you make changes here, please keep
  // nsBoxFrame::Reflow in sync.

  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsLeafBoxFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  NS_ASSERTION(
      aReflowInput.ComputedWidth() >= 0 && aReflowInput.ComputedHeight() >= 0,
      "Computed Size < 0");

#ifdef DO_NOISY_REFLOW
  printf(
      "\n-------------Starting LeafBoxFrame Reflow "
      "----------------------------\n");
  printf("%p ** nsLBF::Reflow %d R: ", this, myCounter++);
  switch (aReflowInput.reason) {
    case eReflowReason_Initial:
      printf("Ini");
      break;
    case eReflowReason_Incremental:
      printf("Inc");
      break;
    case eReflowReason_Resize:
      printf("Rsz");
      break;
    case eReflowReason_StyleChange:
      printf("Sty");
      break;
    case eReflowReason_Dirty:
      printf("Drt ");
      break;
    default:
      printf("<unknown>%d", aReflowInput.reason);
      break;
  }

  printSize("AW", aReflowInput.AvailableWidth());
  printSize("AH", aReflowInput.AvailableHeight());
  printSize("CW", aReflowInput.ComputedWidth());
  printSize("CH", aReflowInput.ComputedHeight());

  printf(" *\n");

#endif

  // create the layout state
  nsBoxLayoutState state(aPresContext, aReflowInput.mRenderingContext);

  nsSize computedSize(aReflowInput.ComputedWidth(),
                      aReflowInput.ComputedHeight());

  nsMargin m;
  m = aReflowInput.ComputedPhysicalBorderPadding();

  // GetXULBorderAndPadding(m);

  // this happens sometimes. So lets handle it gracefully.
  if (aReflowInput.ComputedHeight() == 0) {
    nsSize minSize = GetXULMinSize(state);
    computedSize.height = minSize.height - m.top - m.bottom;
  }

  nsSize prefSize(0, 0);

  // if we are told to layout intrinic then get our preferred size.
  if (computedSize.width == NS_UNCONSTRAINEDSIZE ||
      computedSize.height == NS_UNCONSTRAINEDSIZE) {
    prefSize = GetXULPrefSize(state);
    nsSize minSize = GetXULMinSize(state);
    nsSize maxSize = GetXULMaxSize(state);
    prefSize = BoundsCheck(minSize, prefSize, maxSize);
  }

  // get our desiredSize
  if (aReflowInput.ComputedWidth() == NS_UNCONSTRAINEDSIZE) {
    computedSize.width = prefSize.width;
  } else {
    computedSize.width += m.left + m.right;
  }

  if (aReflowInput.ComputedHeight() == NS_UNCONSTRAINEDSIZE) {
    computedSize.height = prefSize.height;
  } else {
    computedSize.height += m.top + m.bottom;
  }

  // handle reflow input min and max sizes
  // XXXbz the width handling here seems to be wrong, since
  // mComputedMin/MaxWidth is a content-box size, whole
  // computedSize.width is a border-box size...
  if (computedSize.width > aReflowInput.ComputedMaxWidth())
    computedSize.width = aReflowInput.ComputedMaxWidth();

  if (computedSize.width < aReflowInput.ComputedMinWidth())
    computedSize.width = aReflowInput.ComputedMinWidth();

  // Now adjust computedSize.height for our min and max computed
  // height.  The only problem is that those are content-box sizes,
  // while computedSize.height is a border-box size.  So subtract off
  // m.TopBottom() before adjusting, then readd it.
  computedSize.height = std::max(0, computedSize.height - m.TopBottom());
  computedSize.height =
      NS_CSS_MINMAX(computedSize.height, aReflowInput.ComputedMinHeight(),
                    aReflowInput.ComputedMaxHeight());
  computedSize.height += m.TopBottom();

  nsRect r(mRect.x, mRect.y, computedSize.width, computedSize.height);

  SetXULBounds(state, r);

  // layout our children
  XULLayout(state);

  // ok our child could have gotten bigger. So lets get its bounds
  aDesiredSize.Width() = mRect.width;
  aDesiredSize.Height() = mRect.height;
  aDesiredSize.SetBlockStartAscent(GetXULBoxAscent(state));

  // the overflow rect is set in SetXULBounds() above
  aDesiredSize.mOverflowAreas = GetOverflowAreas();

#ifdef DO_NOISY_REFLOW
  {
    printf("%p ** nsLBF(done) W:%d H:%d  ", this, aDesiredSize.Width(),
           aDesiredSize.Height());

    if (maxElementWidth) {
      printf("MW:%d\n", *maxElementWidth);
    } else {
      printf("MW:?\n");
    }
  }
#endif
}

#ifdef DEBUG_FRAME_DUMP
nsresult nsLeafBoxFrame::GetFrameName(nsAString& aResult) const {
  return MakeFrameName(NS_LITERAL_STRING("LeafBox"), aResult);
}
#endif

nsresult nsLeafBoxFrame::CharacterDataChanged(
    const CharacterDataChangeInfo& aInfo) {
  MarkIntrinsicISizesDirty();
  return nsLeafFrame::CharacterDataChanged(aInfo);
}

/* virtual */
nsSize nsLeafBoxFrame::GetXULPrefSize(nsBoxLayoutState& aState) {
  return nsBox::GetXULPrefSize(aState);
}

/* virtual */
nsSize nsLeafBoxFrame::GetXULMinSize(nsBoxLayoutState& aState) {
  return nsBox::GetXULMinSize(aState);
}

/* virtual */
nsSize nsLeafBoxFrame::GetXULMaxSize(nsBoxLayoutState& aState) {
  return nsBox::GetXULMaxSize(aState);
}

/* virtual */
nscoord nsLeafBoxFrame::GetXULFlex() { return nsBox::GetXULFlex(); }

/* virtual */
nscoord nsLeafBoxFrame::GetXULBoxAscent(nsBoxLayoutState& aState) {
  return nsBox::GetXULBoxAscent(aState);
}

NS_IMETHODIMP
nsLeafBoxFrame::DoXULLayout(nsBoxLayoutState& aState) {
  return nsBox::DoXULLayout(aState);
}