C++ nsDisplayListSet::Content方法代码示例

//------------------------------------------------------------
NS_IMETHODIMP
nsGfxCheckboxControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                            const nsRect&           aDirtyRect,
                                            const nsDisplayListSet& aLists)
{
  nsresult rv = nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
  NS_ENSURE_SUCCESS(rv, rv);
  
  // Get current checked state through content model.
  if (!GetCheckboxState() || !IsVisibleForPainting(aBuilder))
    return NS_OK;   // we're not checked or not visible, nothing to paint.
    
  if (IsThemed())
    return NS_OK; // No need to paint the checkmark. The theme will do it.

  // Paint the checkmark
  if (mCheckButtonFaceStyle) {
    // This code actually works now; not sure how useful it'll be
    // (The putpose is to allow the UA stylesheet can substitute its own
    //  checkmark for the default one)
    const nsStyleBackground* myBackground = mCheckButtonFaceStyle->GetStyleBackground();
    if (!myBackground->IsTransparent())
      return aLists.Content()->AppendNewToTop(new (aBuilder)
          nsDisplayGeneric(this, PaintCheckMarkFromStyle, "CheckMarkFromStyle"));
  }

  return aLists.Content()->AppendNewToTop(new (aBuilder) nsDisplayCheckMark(this));
}

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:

  if (!aBuilder->IsForPainting() ||
      !IsVisibleForPainting(aBuilder)) {
    // we don't want the focus ring item for hit-testing or if the item isn't
    // in the area being [re]painted
    return;
  }

  EventStates eventStates = mContent->AsElement()->State();
  if (eventStates.HasState(NS_EVENT_STATE_DISABLED) ||
      !eventStates.HasState(NS_EVENT_STATE_FOCUSRING)) {
    return; // can't have focus or doesn't match :-moz-focusring
  }

  if (!mOuterFocusStyle ||
      !mOuterFocusStyle->StyleBorder()->HasBorder()) {
    // no ::-moz-focus-outer specified border (how style specifies a focus ring
    // for range)
    return;
  }

  const nsStyleDisplay *disp = StyleDisplay();
  if (IsThemed(disp) &&
      PresContext()->GetTheme()->ThemeDrawsFocusForWidget(disp->mAppearance)) {
    return; // the native theme displays its own visual indication of focus
  }

  aLists.Content()->AppendNewToTop(
    new (aBuilder) nsDisplayRangeFocusRing(aBuilder, this));
}

NS_IMETHODIMP
RenderFrameParent::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                    nsSubDocumentFrame* aFrame,
                                    const nsRect& aDirtyRect,
                                    const nsDisplayListSet& aLists)
{
  // We're the subdoc for <browser remote="true"> and it has
  // painted content.  Display its shadow layer tree.
  nsDisplayList shadowTree;
  ContainerLayer* container = GetRootLayer();
  if (aBuilder->IsForEventDelivery() && container) {
    nsRect bounds = aFrame->EnsureInnerView()->GetBounds();
    ViewTransform offset =
      ViewTransform(GetRootFrameOffset(aFrame, aBuilder), 1, 1);
    BuildListForLayer(container, mFrameLoader, offset,
                      aBuilder, shadowTree, aFrame);
  } else {
    shadowTree.AppendToTop(
      new (aBuilder) nsDisplayRemote(aBuilder, aFrame, this));
  }

  // Clip the shadow layers to subdoc bounds
  nsPoint offset = aFrame->GetOffsetToCrossDoc(aBuilder->ReferenceFrame());
  nsRect bounds = aFrame->EnsureInnerView()->GetBounds() + offset;

  return aLists.Content()->AppendNewToTop(
    new (aBuilder) nsDisplayClip(aBuilder, aFrame, &shadowTree,
                                 bounds));
}

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

  // Our children are all grid-level boxes, which behave the same as
  // inline-blocks in painting, so their borders/backgrounds all go on
  // the BlockBorderBackgrounds list.
  // Also, we capture positioned descendants so we can sort them by
  // CSS 'order'.
  nsDisplayList positionedDescendants;
  nsDisplayListSet childLists(aLists.BlockBorderBackgrounds(),
                              aLists.BlockBorderBackgrounds(),
                              aLists.Floats(),
                              aLists.Content(),
                              &positionedDescendants,
                              aLists.Outlines());
  typedef GridItemCSSOrderIterator::OrderState OrderState;
  OrderState order = mIsNormalFlowInCSSOrder ? OrderState::eKnownOrdered
                                             : OrderState::eKnownUnordered;
  GridItemCSSOrderIterator iter(this, kPrincipalList, order);
  for (; !iter.AtEnd(); iter.Next()) {
    nsIFrame* child = *iter;
    BuildDisplayListForChild(aBuilder, child, aDirtyRect, childLists,
                             ::GetDisplayFlagsForGridItem(child));
  }
  positionedDescendants.SortByCSSOrder(aBuilder);
  aLists.PositionedDescendants()->AppendToTop(&positionedDescendants);
}

nsresult nsDisplayWrapper::WrapLists(nsDisplayListBuilder* aBuilder,
    nsIFrame* aFrame, const nsDisplayListSet& aIn, const nsDisplayListSet& aOut)
{
  nsresult rv = WrapListsInPlace(aBuilder, aFrame, aIn);
  NS_ENSURE_SUCCESS(rv, rv);

  if (&aOut == &aIn)
    return NS_OK;
  aOut.BorderBackground()->AppendToTop(aIn.BorderBackground());
  aOut.BlockBorderBackgrounds()->AppendToTop(aIn.BlockBorderBackgrounds());
  aOut.Floats()->AppendToTop(aIn.Floats());
  aOut.Content()->AppendToTop(aIn.Content());
  aOut.PositionedDescendants()->AppendToTop(aIn.PositionedDescendants());
  aOut.Outlines()->AppendToTop(aIn.Outlines());
  return NS_OK;
}

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

  nsDisplayList content;

  {
    // Clear clip state while we construct the children of the
    // nsDisplayTransform, since they'll be in a different coordinate system.
    DisplayListClipState::AutoSaveRestore clipState(aBuilder);
    clipState.Clear();

    nsIFrame* child = GetFirstPrincipalChild();
    nsRect dirty = aDirtyRect;
    dirty.ScaleInverseRoundOut(PresContext()->GetPrintPreviewScale());

    while (child) {
      if (child->GetVisualOverflowRectRelativeToParent().Intersects(dirty)) {
        child->BuildDisplayListForStackingContext(aBuilder,
            dirty - child->GetPosition(), &content);
        aBuilder->ResetMarkedFramesForDisplayList();
      }
      child = child->GetNextSibling();
    }
  }

  content.AppendNewToTop(new (aBuilder)
      nsDisplayTransform(aBuilder, this, &content, content.GetVisibleRect(),
                         ::ComputePageSequenceTransform));

  aLists.Content()->AppendToTop(&content);
}

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

  if ((0 == mRect.width) || (0 == mRect.height)) {
    // Do not render when given a zero area. This avoids some useless
    // scaling work while we wait for our image dimensions to arrive
    // asynchronously.
    return NS_OK;
  }

  if (!IsVisibleForPainting(aBuilder))
    return NS_OK;


  nsDisplayList list;
  rv = list.AppendNewToTop(
      new (aBuilder) nsDisplayXULImage(aBuilder, this));
  NS_ENSURE_SUCCESS(rv, rv);

  CreateOwnLayerIfNeeded(aBuilder, &list);

  aLists.Content()->AppendToTop(&list);
  return NS_OK;
}

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

  if ((0 == mRect.width) || (0 == mRect.height)) {
    // Do not render when given a zero area. This avoids some useless
    // scaling work while we wait for our image dimensions to arrive
    // asynchronously.
    return;
  }

  if (!IsVisibleForPainting(aBuilder))
    return;

  uint32_t clipFlags =
    nsStyleUtil::ObjectPropsMightCauseOverflow(StylePosition()) ?
    0 : DisplayListClipState::ASSUME_DRAWING_RESTRICTED_TO_CONTENT_RECT;

  DisplayListClipState::AutoClipContainingBlockDescendantsToContentBox
    clip(aBuilder, this, clipFlags);

  nsDisplayList list;
  list.AppendNewToTop(
    new (aBuilder) nsDisplayXULImage(aBuilder, this));

  CreateOwnLayerIfNeeded(aBuilder, &list);

  aLists.Content()->AppendToTop(&list);
}

NS_IMETHODIMP
nsGfxRadioControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                         const nsRect&           aDirtyRect,
                                         const nsDisplayListSet& aLists)
{
  nsresult rv = nsFormControlFrame::BuildDisplayList(aBuilder, aDirtyRect,
                                                     aLists);
  NS_ENSURE_SUCCESS(rv, rv);
  
  if (!IsVisibleForPainting(aBuilder))
    return NS_OK;
  
  if (IsThemed())
    return NS_OK; // The theme will paint the check, if any.

  bool checked = true;
  GetCurrentCheckState(&checked); // Get check state from the content model
  if (!checked)
    return NS_OK;
    
  return aLists.Content()->AppendNewToTop(new (aBuilder)
    nsDisplayGeneric(aBuilder, this, PaintCheckedRadioButton,
                     "CheckedRadioButton",
                     nsDisplayItem::TYPE_CHECKED_RADIOBUTTON));
}

NS_IMETHODIMP
nsComboboxControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                         const nsRect&           aDirtyRect,
                                         const nsDisplayListSet& aLists)
{
#ifdef NOISY
  printf("%p paint at (%d, %d, %d, %d)\n", this,
    aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height);
#endif

  if (aBuilder->IsForEventDelivery()) {
    // Don't allow children to receive events.
    // REVIEW: following old GetFrameForPoint
    nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  } else {
    // REVIEW: Our in-flow child frames are inline-level so they will paint in our
    // content list, so we don't need to mess with layers.
    nsresult rv = nsBlockFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsPresContext *presContext = PresContext();
  const nsStyleDisplay *disp = GetStyleDisplay();
  if ((!IsThemed(disp) ||
       !presContext->GetTheme()->ThemeDrawsFocusForWidget(presContext, this, disp->mAppearance)) &&
      mDisplayFrame && IsVisibleForPainting(aBuilder)) {
    nsresult rv = aLists.Content()->AppendNewToTop(new (aBuilder)
                                                   nsDisplayComboboxFocus(this));
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return DisplaySelectionOverlay(aBuilder, aLists);
}

//  Only paint the selected child...
void
nsMathMLSelectedFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                        const nsRect&           aDirtyRect,
                                        const nsDisplayListSet& aLists)
{
  // Report an error if something wrong was found in this frame.
  // We can't call nsDisplayMathMLError from here,
  // so ask nsMathMLContainerFrame to do the work for us.
  if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
    nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
    return;
  }

  DisplayBorderBackgroundOutline(aBuilder, aLists);

  nsIFrame* childFrame = GetSelectedFrame();
  if (childFrame) {
    // Put the child's background directly onto the content list
    nsDisplayListSet set(aLists, aLists.Content());
    // The children should be in content order
    BuildDisplayListForChild(aBuilder, childFrame, aDirtyRect, set);
  }

#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
  // visual debug
  DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists);
#endif
}

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);
}

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());
}

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());
}

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;
}