C++ nsDisplayListSet类代码示例

void
nsSliderFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
                                           const nsRect&           aDirtyRect,
                                           const nsDisplayListSet& aLists)
{
  // if we are too small to have a thumb don't paint it.
  nsIFrame* thumb = nsBox::GetChildBox(this);

  if (thumb) {
    nsRect thumbRect(thumb->GetRect());
    nsMargin m;
    thumb->GetMargin(m);
    thumbRect.Inflate(m);

    nsRect crect;
    GetClientRect(crect);

    if (crect.width < thumbRect.width || crect.height < thumbRect.height)
      return;

    // If this scrollbar is the scrollbar of an actively scrolled scroll frame,
    // layerize the scrollbar thumb, wrap it in its own ContainerLayer and
    // attach scrolling information to it.
    // We do this here and not in the thumb's nsBoxFrame::BuildDisplayList so
    // that the event region that gets created for the thumb is included in
    // the nsDisplayOwnLayer contents.

    uint32_t flags = 0;
    mozilla::layers::FrameMetrics::ViewID scrollTargetId =
      mozilla::layers::FrameMetrics::NULL_SCROLL_ID;
    aBuilder->GetScrollbarInfo(&scrollTargetId, &flags);
    bool thumbGetsLayer = (scrollTargetId != layers::FrameMetrics::NULL_SCROLL_ID);
    nsLayoutUtils::SetScrollbarThumbLayerization(thumb, thumbGetsLayer);

    if (thumbGetsLayer) {
      nsDisplayListCollection tempLists;
      nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, tempLists);

      // This is a bit of a hack. Collect up all descendant display items
      // and merge them into a single Content() list.
      nsDisplayList masterList;
      masterList.AppendToTop(tempLists.BorderBackground());
      masterList.AppendToTop(tempLists.BlockBorderBackgrounds());
      masterList.AppendToTop(tempLists.Floats());
      masterList.AppendToTop(tempLists.Content());
      masterList.AppendToTop(tempLists.PositionedDescendants());
      masterList.AppendToTop(tempLists.Outlines());

      // Wrap the list to make it its own layer.
      aLists.Content()->AppendNewToTop(new (aBuilder)
        nsDisplayOwnLayer(aBuilder, this, &masterList, flags, scrollTargetId,
                          GetThumbRatio()));

      return;
    }
  }
  
  nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);
}

NS_IMETHODIMP
nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                           const nsRect&           aDirtyRect,
                                           const nsDisplayListSet& aLists)
{
  nsDisplayList onTop;
  if (IsVisibleForPainting(aBuilder)) {
    nsresult rv = mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  
  nsDisplayListCollection set;
  // Do not allow the child subtree to receive events.
  if (!aBuilder->IsForEventDelivery()) {
    nsresult rv =
      BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set,
                               DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
    NS_ENSURE_SUCCESS(rv, rv);
    // That should put the display items in set.Content()
  }
  
  // Put the foreground outline and focus rects on top of the children
  set.Content()->AppendToTop(&onTop);

  // clips to our padding box for <input>s but not <button>s, unless
  // they have non-visible overflow..
  if (IsInput() || GetStyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE) {
    nsMargin border = GetStyleBorder()->GetComputedBorder();
    nsRect rect(aBuilder->ToReferenceFrame(this), GetSize());
    rect.Deflate(border);
    nscoord radii[8];
    GetPaddingBoxBorderRadii(radii);

    nsresult rv = OverflowClip(aBuilder, set, aLists, rect, radii);
    NS_ENSURE_SUCCESS(rv, rv);
  } else {
    set.MoveTo(aLists);
  }
  
  nsresult rv = DisplayOutline(aBuilder, aLists);
  NS_ENSURE_SUCCESS(rv, rv);

  // to draw border when selected in editor
  return DisplaySelectionOverlay(aBuilder, aLists.Content());
}

nsresult
nsMathMLmtdFrame::ProcessBorders(nsTableFrame* aFrame,
                                 nsDisplayListBuilder* aBuilder,
                                 const nsDisplayListSet& aLists)
{
  aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
                                            nsDisplaymtdBorder(aBuilder, this));
  return NS_OK;
}

NS_IMETHODIMP
nsFileControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                     const nsRect&           aDirtyRect,
                                     const nsDisplayListSet& aLists)
{
  // box-shadow
  if (GetStyleBorder()->mBoxShadow) {
    nsresult rv = aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
        nsDisplayBoxShadowOuter(aBuilder, this));
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Our background is inherited to the text input, and we don't really want to
  // paint it or out padding and borders (which we never have anyway, per
  // styles in forms.css) -- doing it just makes us look ugly in some cases and
  // has no effect in others.
  nsDisplayListCollection tempList;
  nsresult rv = nsBlockFrame::BuildDisplayList(aBuilder, aDirtyRect, tempList);
  if (NS_FAILED(rv))
    return rv;

  tempList.BorderBackground()->DeleteAll();

  // Clip height only
  nsRect clipRect(aBuilder->ToReferenceFrame(this), GetSize());
  clipRect.width = GetVisualOverflowRect().XMost();
  nscoord radii[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  rv = OverflowClip(aBuilder, tempList, aLists, clipRect, radii);
  NS_ENSURE_SUCCESS(rv, rv);

  // Disabled file controls don't pass mouse events to their children, so we
  // put an invisible item in the display list above the children
  // just to catch events
  nsEventStates eventStates = mContent->AsElement()->State();
  if (eventStates.HasState(NS_EVENT_STATE_DISABLED) && IsVisibleForPainting(aBuilder)) {
    rv = aLists.Content()->AppendNewToTop(
        new (aBuilder) nsDisplayEventReceiver(aBuilder, this));
    if (NS_FAILED(rv))
      return rv;
  }

  return DisplaySelectionOverlay(aBuilder, aLists.Content());
}

void
nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                           const nsRect&           aDirtyRect,
                                           const nsDisplayListSet& aLists)
{
  nsDisplayList onTop;
  if (IsVisibleForPainting(aBuilder)) {
    mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop);
  }

  nsDisplayListCollection set;

  // Do not allow the child subtree to receive events.
  if (!aBuilder->IsForEventDelivery()) {
    DisplayListClipState::AutoSaveRestore clipState(aBuilder);

    if (IsInput() || StyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE) {
      nsMargin border = StyleBorder()->GetComputedBorder();
      nsRect rect(aBuilder->ToReferenceFrame(this), GetSize());
      rect.Deflate(border);
      nscoord radii[8];
      bool hasRadii = GetPaddingBoxBorderRadii(radii);
      clipState.ClipContainingBlockDescendants(rect, hasRadii ? radii : nullptr);
    }

    BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set,
                             DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
    // That should put the display items in set.Content()
  }
  
  // Put the foreground outline and focus rects on top of the children
  set.Content()->AppendToTop(&onTop);
  set.MoveTo(aLists);
  
  DisplayOutline(aBuilder, aLists);

  // to draw border when selected in editor
  DisplaySelectionOverlay(aBuilder, aLists.Content());
}

NS_IMETHODIMP
nsVideoFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                               const nsRect&           aDirtyRect,
                               const nsDisplayListSet& aLists)
{
  if (!IsVisibleForPainting(aBuilder))
    return NS_OK;

  DO_GLOBAL_REFLOW_COUNT_DSP("nsVideoFrame");

  nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!ShouldDisplayPoster() && HasVideoData()) {
    rv = aLists.Content()->AppendNewToTop(
        new (aBuilder) nsDisplayGeneric(this, ::PaintVideo, "Video"));
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Add child frames to display list. We expect up to two children, an image
  // frame for the poster, and the box frame for the video controls.
  for (nsIFrame *child = mFrames.FirstChild();
       child;
       child = child->GetNextSibling()) {
    if (child->GetType() == nsGkAtoms::imageFrame && ShouldDisplayPoster()) {
      rv = child->BuildDisplayListForStackingContext(aBuilder,
                                                     aDirtyRect - child->GetOffsetTo(this),
                                                     aLists.Content());
      NS_ENSURE_SUCCESS(rv,rv);
    } else if (child->GetType() == nsGkAtoms::boxFrame) {
      rv = child->BuildDisplayListForStackingContext(aBuilder,
                                                     aDirtyRect - child->GetOffsetTo(this),
                                                     aLists.Content());
      NS_ENSURE_SUCCESS(rv,rv);
    }
  }

  return NS_OK;
}

void
nsRangeFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                               const nsRect&           aDirtyRect,
                               const nsDisplayListSet& aLists)
{
  if (IsThemed()) {
    DisplayBorderBackgroundOutline(aBuilder, aLists);
    // Only create items for the thumb. Specifically, we do not want
    // the track to paint, since *our* background is used to paint
    // the track, and we don't want the unthemed track painting over
    // the top of the themed track.
    // This logic is copied from
    // nsContainerFrame::BuildDisplayListForNonBlockChildren as
    // called by BuildDisplayListForInline.
    nsIFrame* thumb = mThumbDiv->GetPrimaryFrame();
    if (thumb) {
      nsDisplayListSet set(aLists, aLists.Content());
      BuildDisplayListForChild(aBuilder, thumb, aDirtyRect, set, DISPLAY_CHILD_INLINE);
    }
  } else {
    BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
  }

  // Draw a focus outline if appropriate:
  nsEventStates eventStates = mContent->AsElement()->State();
  if (!eventStates.HasState(NS_EVENT_STATE_FOCUSRING) ||
      eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
    return;
  }
  nsPresContext *presContext = PresContext();
  const nsStyleDisplay *disp = StyleDisplay();
  if ((!IsThemed(disp) ||
       !presContext->GetTheme()->ThemeDrawsFocusForWidget(disp->mAppearance)) &&
      IsVisibleForPainting(aBuilder)) {
    aLists.Content()->AppendNewToTop(
      new (aBuilder) nsDisplayRangeFocusRing(aBuilder, this));
  }
}

NS_IMETHODIMP
nsTextBoxFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                 const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists)
{
    if (!IsVisibleForPainting(aBuilder))
      return NS_OK;

    nsresult rv = nsLeafBoxFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
    
    return aLists.Content()->AppendNewToTop(new (aBuilder)
        nsDisplayXULTextBox(aBuilder, this));
}

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

  // The sole purpose of this is to trigger display of the selection
  // window for Named Anchors, which don't have any children and
  // normally don't have any size, but in Editor we use CSS to display
  // an image to represent this "hidden" element.
  if (!mFrames.FirstChild()) {
    DisplaySelectionOverlay(aBuilder, aLists.Content());
  }
}

NS_IMETHODIMP
nsSimplePageSequenceFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                            const nsRect&           aDirtyRect,
                                            const nsDisplayListSet& aLists)
{
  nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = aLists.Content()->AppendNewToTop(new (aBuilder)
        nsDisplayGeneric(this, ::PaintPageSequence, "PageSequence"));
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

void
nsSliderFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsDisplayListSet& aLists)
{
  if (aBuilder->IsForEventDelivery() && isDraggingThumb()) {
    // This is EVIL, we shouldn't be messing with event delivery just to get
    // thumb mouse drag events to arrive at the slider!
    aLists.Outlines()->AppendToTop(new (aBuilder)
      nsDisplayEventReceiver(aBuilder, this));
    return;
  }

  nsBoxFrame::BuildDisplayList(aBuilder, aLists);
}

void nsDisplayListSet::MoveTo(const nsDisplayListSet& aDestination) const
{
  aDestination.BorderBackground()->AppendToTop(BorderBackground());
  aDestination.BlockBorderBackgrounds()->AppendToTop(BlockBorderBackgrounds());
  aDestination.Floats()->AppendToTop(Floats());
  aDestination.Content()->AppendToTop(Content());
  aDestination.PositionedDescendants()->AppendToTop(PositionedDescendants());
  aDestination.Outlines()->AppendToTop(Outlines());
}

void
nsDeckFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
                                         const nsRect&           aDirtyRect,
                                         const nsDisplayListSet& aLists)
{
  // only paint the selected box
  nsIFrame* box = GetSelectedBox();
  if (!box)
    return;

  // Putting the child in the background list. This is a little weird but
  // it matches what we were doing before.
  nsDisplayListSet set(aLists, aLists.BlockBorderBackgrounds());
  BuildDisplayListForChild(aBuilder, box, aDirtyRect, set);
}

void
nsColumnSetFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                   const nsRect&           aDirtyRect,
                                   const nsDisplayListSet& aLists) {
  DisplayBorderBackgroundOutline(aBuilder, aLists);

  aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
      nsDisplayGenericOverflow(aBuilder, this, ::PaintColumnRule, "ColumnRule",
                               nsDisplayItem::TYPE_COLUMN_RULE));
  
  // Our children won't have backgrounds so it doesn't matter where we put them.
  for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
    BuildDisplayListForChild(aBuilder, e.get(), aDirtyRect, aLists);
  }
}

void
nsGroupBoxFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                  const nsRect&           aDirtyRect,
                                  const nsDisplayListSet& aLists)
{
  // Paint our background and border
  if (IsVisibleForPainting(aBuilder)) {
    aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
      nsDisplayXULGroupBackground(aBuilder, this));
    
    DisplayOutline(aBuilder, aLists);
  }

  BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);
}