The Tor Browser: layout/xul/nsBox.cpp@ac0c01689b40 (annotated)

layout/xul/nsBox.cpp@ac0c01689b40 (annotated)

layout/xul/nsBox.cpp

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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 "nsBoxLayoutState.h"
 #include "nsBox.h"
 #include "nsBoxFrame.h"
 #include "nsPresContext.h"
 #include "nsCOMPtr.h"
 #include "nsIContent.h"
 #include "nsContainerFrame.h"
 #include "nsNameSpaceManager.h"
 #include "nsGkAtoms.h"
 #include "nsFrameManager.h"
 #include "nsIDOMNode.h"
 #include "nsIDOMMozNamedAttrMap.h"
 #include "nsIDOMAttr.h"
 #include "nsITheme.h"
 #include "nsIServiceManager.h"
 #include "nsBoxLayout.h"
 #include "FrameLayerBuilder.h"
 #include <algorithm>
 using namespace mozilla;
 #ifdef DEBUG_LAYOUT
 int32_t gIndent = 0;
 #endif
 #ifdef DEBUG_LAYOUT
 void
 nsBoxAddIndents()
 {
     for(int32_t i=0; i < gIndent; i++)
     {
         printf(" ");
     }
 }
 #endif
 #ifdef DEBUG_LAYOUT
 void
 nsBox::AppendAttribute(const nsAutoString& aAttribute, const nsAutoString& aValue, nsAutoString& aResult)
 {
    aResult.Append(aAttribute);
    aResult.AppendLiteral("='");
    aResult.Append(aValue);
    aResult.AppendLiteral("' ");
 }
 void
 nsBox::ListBox(nsAutoString& aResult)
 {
     nsAutoString name;
     GetBoxName(name);
     char addr[100];
     sprintf(addr, "[@%p] ", static_cast<void*>(this));
     aResult.AppendASCII(addr);
     aResult.Append(name);
     aResult.AppendLiteral(" ");
     nsIContent* content = GetContent();
     // add on all the set attributes
     if (content) {
       nsCOMPtr<nsIDOMNode> node(do_QueryInterface(content));
       nsCOMPtr<nsIDOMMozNamedAttrMap> namedMap;
       node->GetAttributes(getter_AddRefs(namedMap));
       uint32_t length;
       namedMap->GetLength(&length);
       nsCOMPtr<nsIDOMAttr> attribute;
       for (uint32_t i = 0; i < length; ++i)
       {
         namedMap->Item(i, getter_AddRefs(attribute));
         attribute->GetName(name);
         nsAutoString value;
         attribute->GetValue(value);
         AppendAttribute(name, value, aResult);
       }
     }
 }
 nsresult
 nsBox::DumpBox(FILE* aFile)
 {
   nsAutoString s;
   ListBox(s);
   fprintf(aFile, "%s", NS_LossyConvertUTF16toASCII(s).get());
   return NS_OK;
 }
 void
 nsBox::PropagateDebug(nsBoxLayoutState& aState)
 {
   // propagate debug information
   if (mState & NS_STATE_DEBUG_WAS_SET) {
     if (mState & NS_STATE_SET_TO_DEBUG)
       SetDebug(aState, true);
     else
       SetDebug(aState, false);
   } else if (mState & NS_STATE_IS_ROOT) {
     SetDebug(aState, gDebug);
   }
 }
 #endif
 #ifdef DEBUG_LAYOUT
 void
 nsBox::GetBoxName(nsAutoString& aName)
 {
   aName.AssignLiteral("Box");
 }
 #endif
 nsresult
 nsBox::BeginLayout(nsBoxLayoutState& aState)
 {
 #ifdef DEBUG_LAYOUT
   nsBoxAddIndents();
   printf("Layout: ");
   DumpBox(stdout);
   printf("\n");
   gIndent++;
 #endif
   // mark ourselves as dirty so no child under us
   // can post an incremental layout.
   // XXXldb Is this still needed?
   mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
   if (GetStateBits() & NS_FRAME_IS_DIRTY)
   {
     // If the parent is dirty, all the children are dirty (nsHTMLReflowState
     // does this too).
     nsIFrame* box;
     for (box = GetChildBox(); box; box = box->GetNextBox())
       box->AddStateBits(NS_FRAME_IS_DIRTY);
   }
   // Another copy-over from nsHTMLReflowState.
   // Since we are in reflow, we don't need to store these properties anymore.
   FrameProperties props = Properties();
   props.Delete(UsedBorderProperty());
   props.Delete(UsedPaddingProperty());
   props.Delete(UsedMarginProperty());
 #ifdef DEBUG_LAYOUT
   PropagateDebug(aState);
 #endif
   return NS_OK;
 }
 NS_IMETHODIMP
 nsBox::DoLayout(nsBoxLayoutState& aState)
 {
   return NS_OK;
 }
 nsresult
 nsBox::EndLayout(nsBoxLayoutState& aState)
 {
   #ifdef DEBUG_LAYOUT
       --gIndent;
   #endif
   return SyncLayout(aState);
 }
 bool nsBox::gGotTheme = false;
 nsITheme* nsBox::gTheme = nullptr;
 nsBox::nsBox()
 {
   MOZ_COUNT_CTOR(nsBox);
   //mX = 0;
   //mY = 0;
   if (!gGotTheme) {
     gGotTheme = true;
     CallGetService("@mozilla.org/chrome/chrome-native-theme;1", &gTheme);
   }
 }
 nsBox::~nsBox()
 {
   // NOTE:  This currently doesn't get called for |nsBoxToBlockAdaptor|
   // objects, so don't rely on putting anything here.
   MOZ_COUNT_DTOR(nsBox);
 }
 /* static */ void
 nsBox::Shutdown()
 {
   gGotTheme = false;
   NS_IF_RELEASE(gTheme);
 }
 nsresult
 nsBox::RelayoutChildAtOrdinal(nsBoxLayoutState& aState, nsIFrame* aChild)
 {
   return NS_OK;
 }
 nsresult
 nsIFrame::GetClientRect(nsRect& aClientRect)
 {
   aClientRect = mRect;
   aClientRect.MoveTo(0,0);
   nsMargin borderPadding;
   GetBorderAndPadding(borderPadding);
   aClientRect.Deflate(borderPadding);
   if (aClientRect.width < 0)
      aClientRect.width = 0;
   if (aClientRect.height < 0)
      aClientRect.height = 0;
  // NS_ASSERTION(aClientRect.width >=0 && aClientRect.height >= 0, "Content Size < 0");
   return NS_OK;
 }
 void
 nsBox::SetBounds(nsBoxLayoutState& aState, const nsRect& aRect, bool aRemoveOverflowAreas)
 {
     NS_BOX_ASSERTION(this, aRect.width >=0 && aRect.height >= 0, "SetBounds Size < 0");
     nsRect rect(mRect);
     uint32_t flags = 0;
     GetLayoutFlags(flags);
     uint32_t stateFlags = aState.LayoutFlags();
     flags |= stateFlags;
     if ((flags & NS_FRAME_NO_MOVE_FRAME) == NS_FRAME_NO_MOVE_FRAME)
       SetSize(aRect.Size());
     else
       SetRect(aRect);
     // Nuke the overflow area. The caller is responsible for restoring
     // it if necessary.
     if (aRemoveOverflowAreas) {
       // remove the previously stored overflow area
       ClearOverflowRects();
     }
     if (!(flags & NS_FRAME_NO_MOVE_VIEW))
     {
       nsContainerFrame::PositionFrameView(this);
       if ((rect.x != aRect.x) || (rect.y != aRect.y))
         nsContainerFrame::PositionChildViews(this);
     }
    /*
     // only if the origin changed
     if ((rect.x != aRect.x) || (rect.y != aRect.y))  {
       if (frame->HasView()) {
         nsContainerFrame::PositionFrameView(presContext, frame,
                                             frame->GetView());
       } else {
         nsContainerFrame::PositionChildViews(presContext, frame);
       }
     }
     */
 }
 void
 nsBox::GetLayoutFlags(uint32_t& aFlags)
 {
   aFlags = 0;
 }
 nsresult
 nsIFrame::GetBorderAndPadding(nsMargin& aBorderAndPadding)
 {
   aBorderAndPadding.SizeTo(0, 0, 0, 0);
   nsresult rv = GetBorder(aBorderAndPadding);
   if (NS_FAILED(rv))
     return rv;
   nsMargin padding;
   rv = GetPadding(padding);
   if (NS_FAILED(rv))
     return rv;
   aBorderAndPadding += padding;
   return rv;
 }
 nsresult
 nsBox::GetBorder(nsMargin& aMargin)
 {
   aMargin.SizeTo(0,0,0,0);
   const nsStyleDisplay* disp = StyleDisplay();
   if (disp->mAppearance && gTheme) {
     // Go to the theme for the border.
     nsPresContext *context = PresContext();
     if (gTheme->ThemeSupportsWidget(context, this, disp->mAppearance)) {
       nsIntMargin margin(0, 0, 0, 0);
       gTheme->GetWidgetBorder(context->DeviceContext(), this,
                               disp->mAppearance, &margin);
       aMargin.top = context->DevPixelsToAppUnits(margin.top);
       aMargin.right = context->DevPixelsToAppUnits(margin.right);
       aMargin.bottom = context->DevPixelsToAppUnits(margin.bottom);
       aMargin.left = context->DevPixelsToAppUnits(margin.left);
       return NS_OK;
     }
   }
   aMargin = StyleBorder()->GetComputedBorder();
   return NS_OK;
 }
 nsresult
 nsBox::GetPadding(nsMargin& aMargin)
 {
   const nsStyleDisplay *disp = StyleDisplay();
   if (disp->mAppearance && gTheme) {
     // Go to the theme for the padding.
     nsPresContext *context = PresContext();
     if (gTheme->ThemeSupportsWidget(context, this, disp->mAppearance)) {
       nsIntMargin margin(0, 0, 0, 0);
       bool useThemePadding;
       useThemePadding = gTheme->GetWidgetPadding(context->DeviceContext(),
                                                  this, disp->mAppearance,
                                                  &margin);
       if (useThemePadding) {
         aMargin.top = context->DevPixelsToAppUnits(margin.top);
         aMargin.right = context->DevPixelsToAppUnits(margin.right);
         aMargin.bottom = context->DevPixelsToAppUnits(margin.bottom);
         aMargin.left = context->DevPixelsToAppUnits(margin.left);
         return NS_OK;
       }
     }
   }
   aMargin.SizeTo(0,0,0,0);
   StylePadding()->GetPadding(aMargin);
   return NS_OK;
 }
 nsresult
 nsBox::GetMargin(nsMargin& aMargin)
 {
   aMargin.SizeTo(0,0,0,0);
   StyleMargin()->GetMargin(aMargin);
   return NS_OK;
 }
 void
 nsBox::SizeNeedsRecalc(nsSize& aSize)
 {
   aSize.width  = -1;
   aSize.height = -1;
 }
 void
 nsBox::CoordNeedsRecalc(nscoord& aFlex)
 {
   aFlex = -1;
 }
 bool
 nsBox::DoesNeedRecalc(const nsSize& aSize)
 {
   return (aSize.width == -1 || aSize.height == -1);
 }
 bool
 nsBox::DoesNeedRecalc(nscoord aCoord)
 {
   return (aCoord == -1);
 }
 nsSize
 nsBox::GetPrefSize(nsBoxLayoutState& aState)
 {
   NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
   nsSize pref(0,0);
   DISPLAY_PREF_SIZE(this, pref);
   if (IsCollapsed())
     return pref;
   AddBorderAndPadding(pref);
   bool widthSet, heightSet;
   nsIFrame::AddCSSPrefSize(this, pref, widthSet, heightSet);
   nsSize minSize = GetMinSize(aState);
   nsSize maxSize = GetMaxSize(aState);
   return BoundsCheck(minSize, pref, maxSize);
 }
 nsSize
 nsBox::GetMinSize(nsBoxLayoutState& aState)
 {
   NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
   nsSize min(0,0);
   DISPLAY_MIN_SIZE(this, min);
   if (IsCollapsed())
     return min;
   AddBorderAndPadding(min);
   bool widthSet, heightSet;
   nsIFrame::AddCSSMinSize(aState, this, min, widthSet, heightSet);
   return min;
 }
 nsSize
 nsBox::GetMinSizeForScrollArea(nsBoxLayoutState& aBoxLayoutState)
 {
   return nsSize(0, 0);
 }
 nsSize
 nsBox::GetMaxSize(nsBoxLayoutState& aState)
 {
   NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
   nsSize maxSize(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
   DISPLAY_MAX_SIZE(this, maxSize);
   if (IsCollapsed())
     return maxSize;
   AddBorderAndPadding(maxSize);
   bool widthSet, heightSet;
   nsIFrame::AddCSSMaxSize(this, maxSize, widthSet, heightSet);
   return maxSize;
 }
 nscoord
 nsBox::GetFlex(nsBoxLayoutState& aState)
 {
   nscoord flex = 0;
   nsIFrame::AddCSSFlex(aState, this, flex);
   return flex;
 }
 uint32_t
 nsIFrame::GetOrdinal()
 {
   uint32_t ordinal = StyleXUL()->mBoxOrdinal;
   // When present, attribute value overrides CSS.
   nsIContent* content = GetContent();
   if (content && content->IsXUL()) {
     nsresult error;
     nsAutoString value;
     content->GetAttr(kNameSpaceID_None, nsGkAtoms::ordinal, value);
     if (!value.IsEmpty()) {
       ordinal = value.ToInteger(&error);
     }
   }
   return ordinal;
 }
 nscoord
 nsBox::GetBoxAscent(nsBoxLayoutState& aState)
 {
   if (IsCollapsed())
     return 0;
   return GetPrefSize(aState).height;
 }
 bool
 nsBox::IsCollapsed()
 {
   return StyleVisibility()->mVisible == NS_STYLE_VISIBILITY_COLLAPSE;
 }
 nsresult
 nsIFrame::Layout(nsBoxLayoutState& aState)
 {
   NS_ASSERTION(aState.GetRenderingContext(), "must have rendering context");
   nsBox *box = static_cast<nsBox*>(this);
   DISPLAY_LAYOUT(box);
   box->BeginLayout(aState);
   box->DoLayout(aState);
   box->EndLayout(aState);
   return NS_OK;
 }
 bool
 nsBox::DoesClipChildren()
 {
   const nsStyleDisplay* display = StyleDisplay();
   NS_ASSERTION((display->mOverflowY == NS_STYLE_OVERFLOW_CLIP) ==
                (display->mOverflowX == NS_STYLE_OVERFLOW_CLIP),
                "If one overflow is clip, the other should be too");
   return display->mOverflowX == NS_STYLE_OVERFLOW_CLIP;
 }
 nsresult
 nsBox::SyncLayout(nsBoxLayoutState& aState)
 {
   /*
   if (IsCollapsed()) {
     CollapseChild(aState, this, true);
     return NS_OK;
   }
   */
   if (GetStateBits() & NS_FRAME_IS_DIRTY)
      Redraw(aState);
   RemoveStateBits(NS_FRAME_HAS_DIRTY_CHILDREN | NS_FRAME_IS_DIRTY
                   | NS_FRAME_FIRST_REFLOW | NS_FRAME_IN_REFLOW);
   nsPresContext* presContext = aState.PresContext();
   uint32_t flags = 0;
   GetLayoutFlags(flags);
   uint32_t stateFlags = aState.LayoutFlags();
   flags |= stateFlags;
   nsRect visualOverflow;
   if (ComputesOwnOverflowArea()) {
     visualOverflow = GetVisualOverflowRect();
   }
   else {
     nsRect rect(nsPoint(0, 0), GetSize());
     nsOverflowAreas overflowAreas(rect, rect);
     if (!DoesClipChildren() && !IsCollapsed()) {
       // See if our child frames caused us to overflow after being laid
       // out. If so, store the overflow area.  This normally can't happen
       // in XUL, but it can happen with the CSS 'outline' property and
       // possibly with other exotic stuff (e.g. relatively positioned
       // frames in HTML inside XUL).
       nsLayoutUtils::UnionChildOverflow(this, overflowAreas);
     }
     FinishAndStoreOverflow(overflowAreas, GetSize());
     visualOverflow = overflowAreas.VisualOverflow();
   }
   nsView* view = GetView();
   if (view) {
     // Make sure the frame's view is properly sized and positioned and has
     // things like opacity correct
     nsContainerFrame::SyncFrameViewAfterReflow(presContext, this, view,
                                                visualOverflow, flags);
   }
   return NS_OK;
 }
 nsresult
 nsIFrame::Redraw(nsBoxLayoutState& aState)
 {
   if (aState.PaintingDisabled())
     return NS_OK;
   // nsStackLayout, at least, expects us to repaint descendants even
   // if a damage rect is provided
   InvalidateFrameSubtree();
   return NS_OK;
 }
 bool
 nsIFrame::AddCSSPrefSize(nsIFrame* aBox, nsSize& aSize, bool &aWidthSet, bool &aHeightSet)
 {
     aWidthSet = false;
     aHeightSet = false;
     // add in the css min, max, pref
     const nsStylePosition* position = aBox->StylePosition();
     // see if the width or height was specifically set
     // XXX Handle eStyleUnit_Enumerated?
     // (Handling the eStyleUnit_Enumerated types requires
     // GetPrefSize/GetMinSize methods that don't consider
     // (min-/max-/)(width/height) properties.)
     const nsStyleCoord &width = position->mWidth;
     if (width.GetUnit() == eStyleUnit_Coord) {
         aSize.width = width.GetCoordValue();
         aWidthSet = true;
     } else if (width.IsCalcUnit()) {
         if (!width.CalcHasPercent()) {
             // pass 0 for percentage basis since we know there are no %s
             aSize.width = nsRuleNode::ComputeComputedCalc(width, 0);
             if (aSize.width < 0)
                 aSize.width = 0;
             aWidthSet = true;
         }
     }
     const nsStyleCoord &height = position->mHeight;
     if (height.GetUnit() == eStyleUnit_Coord) {
         aSize.height = height.GetCoordValue();
         aHeightSet = true;
     } else if (height.IsCalcUnit()) {
         if (!height.CalcHasPercent()) {
             // pass 0 for percentage basis since we know there are no %s
             aSize.height = nsRuleNode::ComputeComputedCalc(height, 0);
             if (aSize.height < 0)
                 aSize.height = 0;
             aHeightSet = true;
         }
     }
     nsIContent* content = aBox->GetContent();
     // ignore 'height' and 'width' attributes if the actual element is not XUL
     // For example, we might be magic XUL frames whose primary content is an HTML
     // <select>
     if (content && content->IsXUL()) {
         nsAutoString value;
         nsresult error;
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::width, value);
         if (!value.IsEmpty()) {
             value.Trim("%");
             aSize.width =
               nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
             aWidthSet = true;
         }
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::height, value);
         if (!value.IsEmpty()) {
             value.Trim("%");
             aSize.height =
               nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
             aHeightSet = true;
         }
     }
     return (aWidthSet && aHeightSet);
 }
 bool
 nsIFrame::AddCSSMinSize(nsBoxLayoutState& aState, nsIFrame* aBox, nsSize& aSize,
                       bool &aWidthSet, bool &aHeightSet)
 {
     aWidthSet = false;
     aHeightSet = false;
     bool canOverride = true;
     // See if a native theme wants to supply a minimum size.
     const nsStyleDisplay* display = aBox->StyleDisplay();
     if (display->mAppearance) {
       nsITheme *theme = aState.PresContext()->GetTheme();
       if (theme && theme->ThemeSupportsWidget(aState.PresContext(), aBox, display->mAppearance)) {
         nsIntSize size;
         nsRenderingContext* rendContext = aState.GetRenderingContext();
         if (rendContext) {
           theme->GetMinimumWidgetSize(rendContext, aBox,
                                       display->mAppearance, &size, &canOverride);
           if (size.width) {
             aSize.width = aState.PresContext()->DevPixelsToAppUnits(size.width);
             aWidthSet = true;
           }
           if (size.height) {
             aSize.height = aState.PresContext()->DevPixelsToAppUnits(size.height);
             aHeightSet = true;
           }
         }
       }
     }
     // add in the css min, max, pref
     const nsStylePosition* position = aBox->StylePosition();
     // same for min size. Unfortunately min size is always set to 0. So for now
     // we will assume 0 (as a coord) means not set.
     const nsStyleCoord &minWidth = position->mMinWidth;
     if ((minWidth.GetUnit() == eStyleUnit_Coord &&
          minWidth.GetCoordValue() != 0) ||
         (minWidth.IsCalcUnit() && !minWidth.CalcHasPercent())) {
         nscoord min = nsRuleNode::ComputeCoordPercentCalc(minWidth, 0);
         if (!aWidthSet || (min > aSize.width && canOverride)) {
            aSize.width = min;
            aWidthSet = true;
         }
     } else if (minWidth.GetUnit() == eStyleUnit_Percent) {
         NS_ASSERTION(minWidth.GetPercentValue() == 0.0f,
           "Non-zero percentage values not currently supported");
         aSize.width = 0;
         aWidthSet = true; // FIXME: should we really do this for
                              // nonzero values?
     }
     // XXX Handle eStyleUnit_Enumerated?
     // (Handling the eStyleUnit_Enumerated types requires
     // GetPrefSize/GetMinSize methods that don't consider
     // (min-/max-/)(width/height) properties.
     // calc() with percentage is treated like '0' (unset)
     const nsStyleCoord &minHeight = position->mMinHeight;
     if ((minHeight.GetUnit() == eStyleUnit_Coord &&
          minHeight.GetCoordValue() != 0) ||
         (minHeight.IsCalcUnit() && !minHeight.CalcHasPercent())) {
         nscoord min = nsRuleNode::ComputeCoordPercentCalc(minHeight, 0);
         if (!aHeightSet || (min > aSize.height && canOverride)) {
            aSize.height = min;
            aHeightSet = true;
         }
     } else if (minHeight.GetUnit() == eStyleUnit_Percent) {
         NS_ASSERTION(position->mMinHeight.GetPercentValue() == 0.0f,
           "Non-zero percentage values not currently supported");
         aSize.height = 0;
         aHeightSet = true; // FIXME: should we really do this for
                               // nonzero values?
     }
     // calc() with percentage is treated like '0' (unset)
     nsIContent* content = aBox->GetContent();
     if (content && content->IsXUL()) {
         nsAutoString value;
         nsresult error;
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::minwidth, value);
         if (!value.IsEmpty())
         {
             value.Trim("%");
             nscoord val =
               nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
             if (val > aSize.width)
               aSize.width = val;
             aWidthSet = true;
         }
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::minheight, value);
         if (!value.IsEmpty())
         {
             value.Trim("%");
             nscoord val =
               nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
             if (val > aSize.height)
               aSize.height = val;
             aHeightSet = true;
         }
     }
     return (aWidthSet && aHeightSet);
 }
 bool
 nsIFrame::AddCSSMaxSize(nsIFrame* aBox, nsSize& aSize, bool &aWidthSet, bool &aHeightSet)
 {
     aWidthSet = false;
     aHeightSet = false;
     // add in the css min, max, pref
     const nsStylePosition* position = aBox->StylePosition();
     // and max
     // see if the width or height was specifically set
     // XXX Handle eStyleUnit_Enumerated?
     // (Handling the eStyleUnit_Enumerated types requires
     // GetPrefSize/GetMinSize methods that don't consider
     // (min-/max-/)(width/height) properties.)
     const nsStyleCoord maxWidth = position->mMaxWidth;
     if (maxWidth.ConvertsToLength()) {
         aSize.width = nsRuleNode::ComputeCoordPercentCalc(maxWidth, 0);
         aWidthSet = true;
     }
     // percentages and calc() with percentages are treated like 'none'
     const nsStyleCoord &maxHeight = position->mMaxHeight;
     if (maxHeight.ConvertsToLength()) {
         aSize.height = nsRuleNode::ComputeCoordPercentCalc(maxHeight, 0);
         aHeightSet = true;
     }
     // percentages and calc() with percentages are treated like 'none'
     nsIContent* content = aBox->GetContent();
     if (content && content->IsXUL()) {
         nsAutoString value;
         nsresult error;
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::maxwidth, value);
         if (!value.IsEmpty()) {
             value.Trim("%");
             nscoord val =
               nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
             aSize.width = val;
             aWidthSet = true;
         }
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::maxheight, value);
         if (!value.IsEmpty()) {
             value.Trim("%");
             nscoord val =
               nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
             aSize.height = val;
             aHeightSet = true;
         }
     }
     return (aWidthSet || aHeightSet);
 }
 bool
 nsIFrame::AddCSSFlex(nsBoxLayoutState& aState, nsIFrame* aBox, nscoord& aFlex)
 {
     bool flexSet = false;
     // get the flexibility
     aFlex = aBox->StyleXUL()->mBoxFlex;
     // attribute value overrides CSS
     nsIContent* content = aBox->GetContent();
     if (content && content->IsXUL()) {
         nsresult error;
         nsAutoString value;
         content->GetAttr(kNameSpaceID_None, nsGkAtoms::flex, value);
         if (!value.IsEmpty()) {
             value.Trim("%");
             aFlex = value.ToInteger(&error);
             flexSet = true;
         }
     }
     if (aFlex < 0)
       aFlex = 0;
     if (aFlex >= nscoord_MAX)
       aFlex = nscoord_MAX - 1;
     return flexSet || aFlex > 0;
 }
 void
 nsBox::AddBorderAndPadding(nsSize& aSize)
 {
   AddBorderAndPadding(this, aSize);
 }
 void
 nsBox::AddBorderAndPadding(nsIFrame* aBox, nsSize& aSize)
 {
   nsMargin borderPadding(0,0,0,0);
   aBox->GetBorderAndPadding(borderPadding);
   AddMargin(aSize, borderPadding);
 }
 void
 nsBox::AddMargin(nsIFrame* aChild, nsSize& aSize)
 {
   nsMargin margin(0,0,0,0);
   aChild->GetMargin(margin);
   AddMargin(aSize, margin);
 }
 void
 nsBox::AddMargin(nsSize& aSize, const nsMargin& aMargin)
 {
   if (aSize.width != NS_INTRINSICSIZE)
     aSize.width += aMargin.left + aMargin.right;
   if (aSize.height != NS_INTRINSICSIZE)
      aSize.height += aMargin.top + aMargin.bottom;
 }
 nscoord
 nsBox::BoundsCheck(nscoord aMin, nscoord aPref, nscoord aMax)
 {
    if (aPref > aMax)
        aPref = aMax;
    if (aPref < aMin)
        aPref = aMin;
    return aPref;
 }
 nsSize
 nsBox::BoundsCheckMinMax(const nsSize& aMinSize, const nsSize& aMaxSize)
 {
   return nsSize(std::max(aMaxSize.width, aMinSize.width),
                 std::max(aMaxSize.height, aMinSize.height));
 }
 nsSize
 nsBox::BoundsCheck(const nsSize& aMinSize, const nsSize& aPrefSize, const nsSize& aMaxSize)
 {
   return nsSize(BoundsCheck(aMinSize.width, aPrefSize.width, aMaxSize.width),
                 BoundsCheck(aMinSize.height, aPrefSize.height, aMaxSize.height));
 }
 #ifdef DEBUG_LAYOUT
 nsresult
 nsBox::SetDebug(nsBoxLayoutState& aState, bool aDebug)
 {
     return NS_OK;
 }
 NS_IMETHODIMP
 nsBox::GetDebugBoxAt( const nsPoint& aPoint,
                       nsIFrame**     aBox)
 {
   nsRect thisRect(nsPoint(0,0), GetSize());
   if (!thisRect.Contains(aPoint))
     return NS_ERROR_FAILURE;
   nsIFrame* child = GetChildBox();
   nsIFrame* hit = nullptr;
   *aBox = nullptr;
   while (nullptr != child) {
     nsresult rv = child->GetDebugBoxAt(aPoint - child->GetOffsetTo(this), &hit);
     if (NS_SUCCEEDED(rv) && hit) {
       *aBox = hit;
     }
     child = child->GetNextBox();
   }
   // found a child
   if (*aBox) {
     return NS_OK;
   }
   return NS_ERROR_FAILURE;
 }
 nsresult
 nsBox::GetDebug(bool& aDebug)
 {
   aDebug = false;
   return NS_OK;
 }
 #endif

The Tor Browser / annotate

layout/xul/nsBox.cpp@ac0c01689b40 (annotated)

layout/xul/nsBox.cpp