C++ do_QueryFrame函数代码示例

already_AddRefed<DOMRect>
PopupBoxObject::GetOuterScreenRect()
{
  nsRefPtr<DOMRect> rect = new DOMRect(mContent);

  // Return an empty rectangle if the popup is not open.
  nsMenuPopupFrame *menuPopupFrame = do_QueryFrame(GetFrame(false));
  if (!menuPopupFrame || !menuPopupFrame->IsOpen()) {
    return rect.forget();
  }

  nsView* view = menuPopupFrame->GetView();
  if (view) {
    nsIWidget* widget = view->GetWidget();
    if (widget) {
      nsIntRect screenRect;
      widget->GetScreenBounds(screenRect);

      int32_t pp = menuPopupFrame->PresContext()->AppUnitsPerDevPixel();
      rect->SetLayoutRect(ToAppUnits(screenRect, pp));
    }
  }
  return rect.forget();
}

nsresult
nsSVGClipPathFrame::ClipPaint(nsSVGRenderState* aContext,
                              nsIFrame* aParent,
                              const gfxMatrix &aMatrix)
{
    // If the flag is set when we get here, it means this clipPath frame
    // has already been used painting the current clip, and the document
    // has a clip reference loop.
    if (mInUse) {
        NS_WARNING("Clip loop detected!");
        return NS_OK;
    }
    AutoClipPathReferencer clipRef(this);

    mClipParent = aParent;
    if (mClipParentMatrix) {
        *mClipParentMatrix = aMatrix;
    } else {
        mClipParentMatrix = new gfxMatrix(aMatrix);
    }

    bool isTrivial = IsTrivial();

    nsAutoSVGRenderMode mode(aContext,
                             isTrivial ? nsSVGRenderState::CLIP
                             : nsSVGRenderState::CLIP_MASK);


    gfxContext *gfx = aContext->GetGfxContext();

    nsSVGClipPathFrame *clipPathFrame =
        nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nsnull);
    bool referencedClipIsTrivial;
    if (clipPathFrame) {
        referencedClipIsTrivial = clipPathFrame->IsTrivial();
        gfx->Save();
        if (referencedClipIsTrivial) {
            clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
        } else {
            gfx->PushGroup(gfxASurface::CONTENT_ALPHA);
        }
    }

    for (nsIFrame* kid = mFrames.FirstChild(); kid;
            kid = kid->GetNextSibling()) {
        nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
        if (SVGFrame) {
            // The CTM of each frame referencing us can be different.
            SVGFrame->NotifySVGChanged(nsISVGChildFrame::SUPPRESS_INVALIDATION |
                                       nsISVGChildFrame::TRANSFORM_CHANGED);

            bool isOK = true;
            nsSVGClipPathFrame *clipPathFrame =
                nsSVGEffects::GetEffectProperties(kid).GetClipPathFrame(&isOK);
            if (!isOK) {
                continue;
            }

            bool isTrivial;

            if (clipPathFrame) {
                isTrivial = clipPathFrame->IsTrivial();
                gfx->Save();
                if (isTrivial) {
                    clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
                } else {
                    gfx->PushGroup(gfxASurface::CONTENT_ALPHA);
                }
            }

            SVGFrame->PaintSVG(aContext, nsnull);

            if (clipPathFrame) {
                if (!isTrivial) {
                    gfx->PopGroupToSource();

                    nsRefPtr<gfxPattern> clipMaskSurface;
                    gfx->PushGroup(gfxASurface::CONTENT_ALPHA);

                    clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
                    clipMaskSurface = gfx->PopGroup();

                    if (clipMaskSurface) {
                        gfx->Mask(clipMaskSurface);
                    }
                }
                gfx->Restore();
            }
        }
    }

    if (clipPathFrame) {
        if (!referencedClipIsTrivial) {
            gfx->PopGroupToSource();

            nsRefPtr<gfxPattern> clipMaskSurface;
            gfx->PushGroup(gfxASurface::CONTENT_ALPHA);

            clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
            clipMaskSurface = gfx->PopGroup();
//.........这里部分代码省略.........

void
DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time)
{
    Element* root = nullptr;
    nsIFrame* rootFrame = nullptr;
    nsRect rootRect;

    if (mRoot) {
        root = mRoot;
        rootFrame = root->GetPrimaryFrame();
        if (rootFrame) {
            if (rootFrame->GetType() == nsGkAtoms::scrollFrame) {
                nsIScrollableFrame* scrollFrame = do_QueryFrame(rootFrame);
                rootRect = nsLayoutUtils::TransformFrameRectToAncestor(
                               rootFrame,
                               rootFrame->GetContentRectRelativeToSelf(),
                               scrollFrame->GetScrolledFrame());
            } else {
                rootRect = nsLayoutUtils::GetAllInFlowRectsUnion(rootFrame,
                           nsLayoutUtils::GetContainingBlockForClientRect(rootFrame),
                           nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS);
            }
        }
    } else {
        nsCOMPtr<nsIPresShell> presShell = aDocument->GetShell();
        if (presShell) {
            rootFrame = presShell->GetRootScrollFrame();
            if (rootFrame) {
                nsPresContext* presContext = rootFrame->PresContext();
                while (!presContext->IsRootContentDocument()) {
                    presContext = presContext->GetParentPresContext();
                    if (!presContext) {
                        break;
                    }
                    rootFrame = presContext->PresShell()->GetRootScrollFrame();
                }
                root = rootFrame->GetContent()->AsElement();
                nsIScrollableFrame* scrollFrame = do_QueryFrame(rootFrame);
                rootRect = scrollFrame->GetScrollPortRect();
            }
        }
    }

    nsMargin rootMargin;
    NS_FOR_CSS_SIDES(side) {
        nscoord basis = side == eSideTop || side == eSideBottom ?
                        rootRect.height : rootRect.width;
        nsCSSValue value = mRootMargin.*nsCSSRect::sides[side];
        nsStyleCoord coord;
        if (value.IsPixelLengthUnit()) {
            coord.SetCoordValue(value.GetPixelLength());
        } else if (value.IsPercentLengthUnit()) {
            coord.SetPercentValue(value.GetPercentValue());
        } else {
            MOZ_ASSERT_UNREACHABLE("invalid length unit");
        }
        rootMargin.Side(side) = nsLayoutUtils::ComputeCBDependentValue(basis, coord);
    }

    for (auto iter = mObservationTargets.Iter(); !iter.Done(); iter.Next()) {
        Element* target = iter.Get()->GetKey();
        nsIFrame* targetFrame = target->GetPrimaryFrame();
        nsRect targetRect;
        Maybe<nsRect> intersectionRect;

        if (rootFrame && targetFrame) {
            // If mRoot is set we are testing intersection with a container element
            // instead of the implicit root.
            if (mRoot) {
                // Skip further processing of this target if it is not in the same
                // Document as the intersection root, e.g. if root is an element of
                // the main document and target an element from an embedded iframe.
                if (target->GetComposedDoc() != root->GetComposedDoc()) {
                    continue;
                }
                // Skip further processing of this target if is not a descendant of the
                // intersection root in the containing block chain. E.g. this would be
                // the case if the target is in a position:absolute element whose
                // containing block is an ancestor of root.
                if (!nsLayoutUtils::IsAncestorFrameCrossDoc(rootFrame, targetFrame)) {
                    continue;
                }
            }

            targetRect = nsLayoutUtils::GetAllInFlowRectsUnion(
                             targetFrame,
                             nsLayoutUtils::GetContainingBlockForClientRect(targetFrame),
                             nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS
                         );
            intersectionRect = Some(targetFrame->GetVisualOverflowRect());

            nsIFrame* containerFrame = nsLayoutUtils::GetCrossDocParentFrame(targetFrame);
            while (containerFrame && containerFrame != rootFrame) {
                if (containerFrame->GetType() == nsGkAtoms::scrollFrame) {
                    nsIScrollableFrame* scrollFrame = do_QueryFrame(containerFrame);
                    nsRect subFrameRect = scrollFrame->GetScrollPortRect();
                    nsRect intersectionRectRelativeToContainer =
                        nsLayoutUtils::TransformFrameRectToAncestor(targetFrame,
                                intersectionRect.value(),
                                containerFrame);
//.........这里部分代码省略.........

void nsHTMLComboboxAccessible::CacheChildren()
{
  if (!mWeakShell) {
    // This node has been shut down
    mAccChildCount = eChildCountUninitialized;
    return;
  }

  if (mAccChildCount == eChildCountUninitialized) {
    mAccChildCount = 0;
#ifdef COMBO_BOX_WITH_THREE_CHILDREN
    // We no longer create textfield and button accessible, in order to have
    // harmonization between IAccessible2, ATK/AT-SPI and OS X
    nsHTMLComboboxTextFieldAccessible* textFieldAccessible = 
      new nsHTMLComboboxTextFieldAccessible(this, mDOMNode, mWeakShell);
    SetFirstChild(textFieldAccessible);
    if (!textFieldAccessible) {
      return;
    }
    textFieldAccessible->SetParent(this);
    textFieldAccessible->Init();
    mAccChildCount = 1;  // Textfield accessible child successfully added

    nsHTMLComboboxButtonAccessible* buttonAccessible =
      new nsHTMLComboboxButtonAccessible(mParent, mDOMNode, mWeakShell);
    textFieldAccessible->SetNextSibling(buttonAccessible);
    if (!buttonAccessible) {
      return;
    }

    buttonAccessible->SetParent(this);
    buttonAccessible->Init();
    mAccChildCount = 2; // Button accessible child successfully added
#endif

    nsIFrame *frame = GetFrame();
    if (!frame) {
      return;
    }
    nsIComboboxControlFrame *comboFrame = do_QueryFrame(frame);
    if (!comboFrame) {
      return;
    }
    nsIFrame *listFrame = comboFrame->GetDropDown();
    if (!listFrame) {
      return;
    }

    if (!mListAccessible) {
      mListAccessible = 
        new nsHTMLComboboxListAccessible(mParent, mDOMNode, mWeakShell);
      if (!mListAccessible)
        return;

      mListAccessible->Init();
    }

#ifdef COMBO_BOX_WITH_THREE_CHILDREN
    buttonAccessible->SetNextSibling(mListAccessible);
#else
    SetFirstChild(mListAccessible);
#endif

    mListAccessible->SetParent(this);
    mListAccessible->SetNextSibling(nsnull);

    ++ mAccChildCount;  // List accessible child successfully added
  }
}

nsINode*
PopupBoxObject::GetTriggerNode() const
{
  nsMenuPopupFrame *menuPopupFrame = mContent ? do_QueryFrame(mContent->GetPrimaryFrame()) : nullptr;
  return nsMenuPopupFrame::GetTriggerContent(menuPopupFrame);
}

void
APZEventState::ProcessAPZStateChange(const nsCOMPtr<nsIDocument>& aDocument,
                                     ViewID aViewId,
                                     APZStateChange aChange,
                                     int aArg)
{
  switch (aChange)
  {
  case APZStateChange::TransformBegin:
  {
    nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aViewId);
    if (sf) {
      sf->SetTransformingByAPZ(true);
    }
    nsIScrollbarMediator* scrollbarMediator = do_QueryFrame(sf);
    if (scrollbarMediator) {
      scrollbarMediator->ScrollbarActivityStarted();
    }

    if (aDocument && mActiveAPZTransforms == 0) {
      nsCOMPtr<nsIDocShell> docshell(aDocument->GetDocShell());
      if (docshell && sf) {
        nsDocShell* nsdocshell = static_cast<nsDocShell*>(docshell.get());
        nsdocshell->NotifyAsyncPanZoomStarted();
      }
    }
    mActiveAPZTransforms++;
    break;
  }
  case APZStateChange::TransformEnd:
  {
    mActiveAPZTransforms--;
    nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aViewId);
    if (sf) {
      sf->SetTransformingByAPZ(false);
    }
    nsIScrollbarMediator* scrollbarMediator = do_QueryFrame(sf);
    if (scrollbarMediator) {
      scrollbarMediator->ScrollbarActivityStopped();
    }

    if (aDocument && mActiveAPZTransforms == 0) {
      nsCOMPtr<nsIDocShell> docshell(aDocument->GetDocShell());
      if (docshell && sf) {
        nsDocShell* nsdocshell = static_cast<nsDocShell*>(docshell.get());
        nsdocshell->NotifyAsyncPanZoomStopped();
      }
    }
    break;
  }
  case APZStateChange::StartTouch:
  {
    mActiveElementManager->HandleTouchStart(aArg);
    break;
  }
  case APZStateChange::StartPanning:
  {
    mActiveElementManager->HandlePanStart();
    break;
  }
  case APZStateChange::EndTouch:
  {
    mEndTouchIsClick = aArg;
    mActiveElementManager->HandleTouchEnd();
    break;
  }
  default:
    // APZStateChange has a 'sentinel' value, and the compiler complains
    // if an enumerator is not handled and there is no 'default' case.
    break;
  }
}

NS_IMETHODIMP
nsPopupSetFrame::DoLayout(nsBoxLayoutState& aState)
{
  // lay us out
  nsresult rv = nsBoxFrame::DoLayout(aState);

  // lay out all of our currently open popups.
  nsPopupFrameList* currEntry = mPopupList;
  while (currEntry) {
    nsMenuPopupFrame* popupChild = currEntry->mPopupFrame;
    if (popupChild && popupChild->IsOpen()) {
      // then get its preferred size
      nsSize prefSize = popupChild->GetPrefSize(aState);
      nsSize minSize = popupChild->GetMinSize(aState);
      nsSize maxSize = popupChild->GetMaxSize(aState);

      prefSize = BoundsCheck(minSize, prefSize, maxSize);

      popupChild->SetPreferredBounds(aState, nsRect(0,0,prefSize.width, prefSize.height));
      popupChild->SetPopupPosition(nsnull);

      // is the new size too small? Make sure we handle scrollbars correctly
      nsIBox* child = popupChild->GetChildBox();

      nsRect bounds(popupChild->GetRect());

      nsIScrollableFrame *scrollframe = do_QueryFrame(child);
      if (scrollframe &&
          scrollframe->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_AUTO) {
        // if our pref height
        if (bounds.height < prefSize.height) {
          // layout the child
          popupChild->Layout(aState);

          nsMargin scrollbars = scrollframe->GetActualScrollbarSizes();
          if (bounds.width < prefSize.width + scrollbars.left + scrollbars.right)
          {
            bounds.width += scrollbars.left + scrollbars.right;
            popupChild->SetBounds(aState, bounds);
          }
        }
      }

      // layout the child
      popupChild->Layout(aState);
      // if the width or height changed, readjust the popup position. This is a
      // special case for tooltips where the preferred height doesn't include the
      // real height for its inline element, but does once it is laid out.
      // This is bug 228673 which doesn't have a simple fix.
      if (popupChild->GetRect().width > bounds.width ||
          popupChild->GetRect().height > bounds.height) {
        // the size after layout was larger than the preferred size,
        // so set the preferred size accordingly
        popupChild->SetPreferredSize(popupChild->GetSize());
        popupChild->SetPopupPosition(nsnull);
      }
      popupChild->AdjustView();
    }

    currEntry = currEntry->mNextPopup;
  }

  return rv;
}

nsMenuFrame*
nsMenuBarFrame::FindMenuWithShortcut(nsIDOMKeyEvent* aKeyEvent)
{
  uint32_t charCode;
  aKeyEvent->GetCharCode(&charCode);

  nsAutoTArray<uint32_t, 10> accessKeys;
  nsEvent* nativeEvent = nsContentUtils::GetNativeEvent(aKeyEvent);
  nsKeyEvent* nativeKeyEvent = static_cast<nsKeyEvent*>(nativeEvent);
  if (nativeKeyEvent)
    nsContentUtils::GetAccessKeyCandidates(nativeKeyEvent, accessKeys);
  if (accessKeys.IsEmpty() && charCode)
    accessKeys.AppendElement(charCode);

  if (accessKeys.IsEmpty())
    return nullptr; // no character was pressed so just return

  // Enumerate over our list of frames.
  nsIFrame* immediateParent = nullptr;
  GetInsertionPoint(PresContext()->PresShell(), this, nullptr, &immediateParent);
  if (!immediateParent)
    immediateParent = this;

  // Find a most preferred accesskey which should be returned.
  nsIFrame* foundMenu = nullptr;
  uint32_t foundIndex = accessKeys.NoIndex;
  nsIFrame* currFrame = immediateParent->GetFirstPrincipalChild();

  while (currFrame) {
    nsIContent* current = currFrame->GetContent();

    // See if it's a menu item.
    if (nsXULPopupManager::IsValidMenuItem(PresContext(), current, false)) {
      // Get the shortcut attribute.
      nsAutoString shortcutKey;
      current->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, shortcutKey);
      if (!shortcutKey.IsEmpty()) {
        ToLowerCase(shortcutKey);
        const PRUnichar* start = shortcutKey.BeginReading();
        const PRUnichar* end = shortcutKey.EndReading();
        uint32_t ch = UTF16CharEnumerator::NextChar(&start, end);
        uint32_t index = accessKeys.IndexOf(ch);
        if (index != accessKeys.NoIndex &&
            (foundIndex == accessKeys.NoIndex || index < foundIndex)) {
          foundMenu = currFrame;
          foundIndex = index;
        }
      }
    }
    currFrame = currFrame->GetNextSibling();
  }
  if (foundMenu) {
    return do_QueryFrame(foundMenu);
  }

  // didn't find a matching menu item
#ifdef XP_WIN
  // behavior on Windows - this item is on the menu bar, beep and deactivate the menu bar
  if (mIsActive) {
    nsCOMPtr<nsISound> soundInterface = do_CreateInstance("@mozilla.org/sound;1");
    if (soundInterface)
      soundInterface->Beep();
  }

  nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
  if (pm) {
    nsIFrame* popup = pm->GetTopPopup(ePopupTypeAny);
    if (popup)
      pm->HidePopup(popup->GetContent(), true, true, true);
  }

  SetCurrentMenuItem(nullptr);
  SetActive(false);

#endif  // #ifdef XP_WIN

  return nullptr;
}

nsSVGTextContainerFrame*
SVGTextContentElement::GetTextContainerFrame()
{
  return do_QueryFrame(GetPrimaryFrame(Flush_Layout));
}

gfxRect
nsSVGMarkerFrame::GetMarkBBoxContribution(const gfxMatrix &aToBBoxUserspace,
                                          PRUint32 aFlags,
                                          nsSVGPathGeometryFrame *aMarkedFrame,
                                          const nsSVGMark *aMark,
                                          float aStrokeWidth)
{
  // If the flag is set when we get here, it means this marker frame
  // has already been used in calculating the current mark bbox, and
  // the document has a marker reference loop.
  if (mInUse)
    return gfxRect();

  AutoMarkerReferencer markerRef(this, aMarkedFrame);

  nsSVGMarkerElement *content = static_cast<nsSVGMarkerElement*>(mContent);

  const nsSVGViewBoxRect viewBox = content->GetViewBoxRect();

  if (viewBox.width <= 0.0f || viewBox.height <= 0.0f) {
    return gfxRect();
  }

  mStrokeWidth = aStrokeWidth;
  mX = aMark->x;
  mY = aMark->y;
  mAutoAngle = aMark->angle;

  gfxMatrix markerTM =
    content->GetMarkerTransform(mStrokeWidth, mX, mY, mAutoAngle);
  gfxMatrix viewBoxTM = content->GetViewBoxTransform();

  gfxMatrix tm = viewBoxTM * markerTM * aToBBoxUserspace;

  gfxRect bbox;
  bool firstChild = true;

  for (nsIFrame* kid = mFrames.FirstChild();
       kid;
       kid = kid->GetNextSibling()) {
    nsISVGChildFrame* child = do_QueryFrame(kid);
    if (child) {
      // When we're being called to obtain the invalidation area, we need to
      // pass down all the flags so that stroke is included. However, once DOM
      // getBBox() accepts flags, maybe we should strip some of those here?

      // We need to include zero width/height vertical/horizontal lines, so we have
      // to use UnionEdges, but we must special case the first bbox so that we don't
      // include the initial gfxRect(0,0,0,0).
      gfxRect childBBox = child->GetBBoxContribution(tm, aFlags);
      if (firstChild && (childBBox.Width() > 0 || childBBox.Height() > 0)) {
        bbox = childBBox;
        firstChild = false;
        continue;
      }
      bbox = bbox.UnionEdges(childBBox);
    }
  }

  return bbox;
}

void
APZEventState::ProcessAPZStateChange(ViewID aViewId,
                                     APZStateChange aChange,
                                     int aArg)
{
  switch (aChange)
  {
  case APZStateChange::eTransformBegin:
  {
    nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aViewId);
    if (sf) {
      sf->SetTransformingByAPZ(true);
    }
    nsIScrollbarMediator* scrollbarMediator = do_QueryFrame(sf);
    if (scrollbarMediator) {
      scrollbarMediator->ScrollbarActivityStarted();
    }

    nsIContent* content = nsLayoutUtils::FindContentFor(aViewId);
    nsIDocument* doc = content ? content->GetComposedDoc() : nullptr;
    nsCOMPtr<nsIDocShell> docshell(doc ? doc->GetDocShell() : nullptr);
    if (docshell && sf) {
      nsDocShell* nsdocshell = static_cast<nsDocShell*>(docshell.get());
      nsdocshell->NotifyAsyncPanZoomStarted();
    }
    break;
  }
  case APZStateChange::eTransformEnd:
  {
    nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aViewId);
    if (sf) {
      sf->SetTransformingByAPZ(false);
    }
    nsIScrollbarMediator* scrollbarMediator = do_QueryFrame(sf);
    if (scrollbarMediator) {
      scrollbarMediator->ScrollbarActivityStopped();
    }

    nsIContent* content = nsLayoutUtils::FindContentFor(aViewId);
    nsIDocument* doc = content ? content->GetComposedDoc() : nullptr;
    nsCOMPtr<nsIDocShell> docshell(doc ? doc->GetDocShell() : nullptr);
    if (docshell && sf) {
      nsDocShell* nsdocshell = static_cast<nsDocShell*>(docshell.get());
      nsdocshell->NotifyAsyncPanZoomStopped();
    }
    break;
  }
  case APZStateChange::eStartTouch:
  {
    mActiveElementManager->HandleTouchStart(aArg);
    break;
  }
  case APZStateChange::eStartPanning:
  {
    // The user started to pan, so we don't want anything to be :active.
    mActiveElementManager->ClearActivation();
    break;
  }
  case APZStateChange::eEndTouch:
  {
    mEndTouchIsClick = aArg;
    mActiveElementManager->HandleTouchEnd();
    break;
  }
  case APZStateChange::eSentinel:
    // Should never happen, but we want this case branch to stop the compiler
    // whining about unhandled values.
    MOZ_ASSERT(false);
    break;
  }
}

void
nsComboboxControlFrame::SetDropDown(nsIFrame* aDropDownFrame)
{
  mDropdownFrame = aDropDownFrame;
  mListControlFrame = do_QueryFrame(mDropdownFrame);
}

NS_IMETHODIMP 
nsComboboxControlFrame::Reflow(nsPresContext*          aPresContext, 
                               nsHTMLReflowMetrics&     aDesiredSize,
                               const nsHTMLReflowState& aReflowState, 
                               nsReflowStatus&          aStatus)
{
  // Constraints we try to satisfy:

  // 1) Default width of button is the vertical scrollbar size
  // 2) If the width of button is bigger than our width, set width of
  //    button to 0.
  // 3) Default height of button is height of display area
  // 4) Width of display area is whatever is left over from our width after
  //    allocating width for the button.
  // 5) Height of display area is GetHeightOfARow() on the
  //    mListControlFrame.

  if (!mDisplayFrame || !mButtonFrame || !mDropdownFrame) {
    NS_ERROR("Why did the frame constructor allow this to happen?  Fix it!!");
    return NS_ERROR_UNEXPECTED;
  }

  // Make sure the displayed text is the same as the selected option, bug 297389.
  PRInt32 selectedIndex;
  nsAutoString selectedOptionText;
  if (!mDroppedDown) {
    selectedIndex = mListControlFrame->GetSelectedIndex();
  }
  else {
    // In dropped down mode the "selected index" is the hovered menu item,
    // we want the last selected item which is |mDisplayedIndex| in this case.
    selectedIndex = mDisplayedIndex;
  }
  if (selectedIndex != -1) {
    mListControlFrame->GetOptionText(selectedIndex, selectedOptionText);
  }
  if (mDisplayedOptionText != selectedOptionText) {
    RedisplayText(selectedIndex);
  }

  // First reflow our dropdown so that we know how tall we should be.
  ReflowDropdown(aPresContext, aReflowState);

  // Get the width of the vertical scrollbar.  That will be the width of the
  // dropdown button.
  nscoord buttonWidth;
  const nsStyleDisplay *disp = GetStyleDisplay();
  if (IsThemed(disp) && !aPresContext->GetTheme()->ThemeNeedsComboboxDropmarker()) {
    buttonWidth = 0;
  }
  else {
    nsIScrollableFrame* scrollable = do_QueryFrame(mListControlFrame);
    NS_ASSERTION(scrollable, "List must be a scrollable frame");
    buttonWidth =
      scrollable->GetDesiredScrollbarSizes(PresContext(), 
                                           aReflowState.rendContext).LeftRight();
    if (buttonWidth > aReflowState.ComputedWidth()) {
      buttonWidth = 0;
    }
  }

  mDisplayWidth = aReflowState.ComputedWidth() - buttonWidth;

  nsresult rv = nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowState,
                                    aStatus);
  NS_ENSURE_SUCCESS(rv, rv);

  // Now set the correct width and height on our button.  The width we need to
  // set always, the height only if we had an auto height.
  nsRect buttonRect = mButtonFrame->GetRect();
  // If we have a non-intrinsic computed height, our kids should have sized
  // themselves properly on their own.
  if (aReflowState.ComputedHeight() == NS_INTRINSICSIZE) {
    // The display frame is going to be the right height and width at this
    // point. Use its height as the button height.
    nsRect displayRect = mDisplayFrame->GetRect();
    buttonRect.height = displayRect.height;
    buttonRect.y = displayRect.y;
  }
#ifdef DEBUG
  else {
    nscoord buttonHeight = mButtonFrame->GetSize().height;
    nscoord displayHeight = mDisplayFrame->GetSize().height;

    // The button and display area should be equal heights, unless the computed
    // height on the combobox is too small to fit their borders and padding.
    NS_ASSERTION(buttonHeight == displayHeight ||
                 (aReflowState.ComputedHeight() < buttonHeight &&
                  buttonHeight ==
                    mButtonFrame->GetUsedBorderAndPadding().TopBottom()) ||
                 (aReflowState.ComputedHeight() < displayHeight &&
                  displayHeight ==
                    mDisplayFrame->GetUsedBorderAndPadding().TopBottom()),
                 "Different heights?");
  }
#endif
  
  if (GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
    // Make sure the right edge of the button frame stays where it is now
    buttonRect.x -= buttonWidth - buttonRect.width;
//.........这里部分代码省略.........

nsTextControlFrame*
nsFileControlFrame::GetTextControlFrame()
{
  nsITextControlFrame* tc = do_QueryFrame(mTextContent->GetPrimaryFrame());
  return static_cast<nsTextControlFrame*>(tc);
}

NS_IMETHODIMP
nsSubDocumentFrame::AttributeChanged(PRInt32 aNameSpaceID,
                                     nsIAtom* aAttribute,
                                     PRInt32 aModType)
{
  if (aNameSpaceID != kNameSpaceID_None) {
    return NS_OK;
  }
  
  // If the noResize attribute changes, dis/allow frame to be resized
  if (aAttribute == nsGkAtoms::noresize) {
    // Note that we're not doing content type checks, but that's ok -- if
    // they'd fail we will just end up with a null framesetFrame.
    if (mContent->GetParent()->Tag() == nsGkAtoms::frameset) {
      nsIFrame* parentFrame = GetParent();

      if (parentFrame) {
        // There is no interface for nsHTMLFramesetFrame so QI'ing to
        // concrete class, yay!
        nsHTMLFramesetFrame* framesetFrame = do_QueryFrame(parentFrame);
        if (framesetFrame) {
          framesetFrame->RecalculateBorderResize();
        }
      }
    }
  }
  else if (aAttribute == nsGkAtoms::type) {
    if (!mFrameLoader) 
      return NS_OK;

    if (!mContent->IsNodeOfType(nsINode::eXUL)) {
      return NS_OK;
    }

    // Note: This logic duplicates a lot of logic in
    // nsFrameLoader::EnsureDocShell.  We should fix that.

    // Notify our enclosing chrome that our type has changed.  We only do this
    // if our parent is chrome, since in all other cases we're random content
    // subframes and the treeowner shouldn't worry about us.

    nsCOMPtr<nsIDocShell> docShell;
    mFrameLoader->GetDocShell(getter_AddRefs(docShell));
    nsCOMPtr<nsIDocShellTreeItem> docShellAsItem(do_QueryInterface(docShell));
    if (!docShellAsItem) {
      return NS_OK;
    }

    nsCOMPtr<nsIDocShellTreeItem> parentItem;
    docShellAsItem->GetParent(getter_AddRefs(parentItem));
    if (!parentItem) {
      return NS_OK;
    }

    PRInt32 parentType;
    parentItem->GetItemType(&parentType);

    if (parentType != nsIDocShellTreeItem::typeChrome) {
      return NS_OK;
    }

    nsCOMPtr<nsIDocShellTreeOwner> parentTreeOwner;
    parentItem->GetTreeOwner(getter_AddRefs(parentTreeOwner));
    if (parentTreeOwner) {
      nsAutoString value;
      mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::type, value);

      PRBool is_primary = value.LowerCaseEqualsLiteral("content-primary");

#ifdef MOZ_XUL
      // when a content panel is no longer primary, hide any open popups it may have
      if (!is_primary) {
        nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
        if (pm)
          pm->HidePopupsInDocShell(docShellAsItem);
      }
#endif

      parentTreeOwner->ContentShellRemoved(docShellAsItem);

      if (value.LowerCaseEqualsLiteral("content") ||
          StringBeginsWith(value, NS_LITERAL_STRING("content-"),
                           nsCaseInsensitiveStringComparator())) {
        PRBool is_targetable = is_primary ||
          value.LowerCaseEqualsLiteral("content-targetable");

        parentTreeOwner->ContentShellAdded(docShellAsItem, is_primary,
                                           is_targetable, value);
      }
    }
  }

  return NS_OK;
}