C++ nsBoxLayoutState::PresContext方法代码示例

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();
  }

  nsIView* 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;
}

void
nsPopupSetFrame::RepositionPopup(nsPopupFrameList* aEntry, nsBoxLayoutState& aState)
{
  // Sync up the view.
  if (aEntry && aEntry->mElementContent) {
    nsIFrame* frameToSyncTo = nsnull;
    nsPresContext* presContext = aState.PresContext();
    presContext->PresShell()->GetPrimaryFrameFor(aEntry->mElementContent,
                                                 &frameToSyncTo );
    ((nsMenuPopupFrame*)(aEntry->mPopupFrame))->SyncViewWithFrame(presContext, 
          aEntry->mPopupAnchor, aEntry->mPopupAlign, frameToSyncTo, aEntry->mXPos, aEntry->mYPos);
  }
}

void
nsTextBoxFrame::CalcTextSize(nsBoxLayoutState& aBoxLayoutState)
{
    if (mNeedsRecalc)
    {
        nsSize size;
        nsPresContext* presContext = aBoxLayoutState.PresContext();
        nsIRenderingContext* rendContext = aBoxLayoutState.GetRenderingContext();
        if (rendContext) {
            GetTextSize(presContext, *rendContext,
                        mTitle, size, mAscent);
            mTextSize = size;
            mNeedsRecalc = PR_FALSE;
        }
    }
}

nscoord
nsListBoxBodyFrame::ComputeIntrinsicISize(nsBoxLayoutState& aBoxLayoutState)
{
  if (mStringWidth != -1)
    return mStringWidth;

  nscoord largestWidth = 0;

  int32_t index = 0;
  nsCOMPtr<nsIDOMElement> firstRowEl;
  GetItemAtIndex(index, getter_AddRefs(firstRowEl));
  nsCOMPtr<nsIContent> firstRowContent(do_QueryInterface(firstRowEl));

  if (firstRowContent) {
    RefPtr<nsStyleContext> styleContext;
    nsPresContext *presContext = aBoxLayoutState.PresContext();
    styleContext = presContext->StyleSet()->
      ResolveStyleFor(firstRowContent->AsElement(), nullptr,
                      ConsumeStyleBehavior::DontConsume,
                      LazyComputeBehavior::Allow);

    nscoord width = 0;
    nsMargin margin(0,0,0,0);

    if (styleContext->StylePadding()->GetPadding(margin))
      width += margin.LeftRight();
    width += styleContext->StyleBorder()->GetComputedBorder().LeftRight();
    if (styleContext->StyleMargin()->GetMargin(margin))
      width += margin.LeftRight();

    FlattenedChildIterator iter(mContent);
    for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
      if (child->IsXULElement(nsGkAtoms::listitem)) {
        nsRenderingContext* rendContext = aBoxLayoutState.GetRenderingContext();
        if (rendContext) {
          nsAutoString value;
          uint32_t textCount = child->GetChildCount();
          for (uint32_t j = 0; j < textCount; ++j) {
            nsIContent* text = child->GetChildAt(j);
            if (text && text->IsNodeOfType(nsINode::eTEXT)) {
              text->AppendTextTo(value);
            }
          }

          RefPtr<nsFontMetrics> fm =
            nsLayoutUtils::GetFontMetricsForStyleContext(styleContext);

          nscoord textWidth =
            nsLayoutUtils::AppUnitWidthOfStringBidi(value, this, *fm,
                                                    *rendContext);
          textWidth += width;

          if (textWidth > largestWidth) 
            largestWidth = textWidth;
        }
      }
    }
  }

  mStringWidth = largestWidth;
  return mStringWidth;
}

PRBool 
nsIBox::AddCSSMinSize(nsBoxLayoutState& aState, nsIBox* aBox, nsSize& aSize)
{

    PRBool widthSet = PR_FALSE;
    PRBool heightSet = PR_FALSE;
    PRBool canOverride = PR_TRUE;

    // See if a native theme wants to supply a minimum size.
    const nsStyleDisplay* display = aBox->GetStyleDisplay();
    if (display->mAppearance) {
      nsITheme *theme = aState.PresContext()->GetTheme();
      if (theme && theme->ThemeSupportsWidget(aState.PresContext(), aBox, display->mAppearance)) {
        nsIntSize size;
        nsIRenderingContext* rendContext = aState.GetRenderingContext();
        if (rendContext) {
          theme->GetMinimumWidgetSize(rendContext, aBox,
                                      display->mAppearance, &size, &canOverride);
          if (size.width) {
            aSize.width = aState.PresContext()->DevPixelsToAppUnits(size.width);
            widthSet = PR_TRUE;
          }
          if (size.height) {
            aSize.height = aState.PresContext()->DevPixelsToAppUnits(size.height);
            heightSet = PR_TRUE;
          }
        }
      }
    }

    // add in the css min, max, pref
    const nsStylePosition* position = aBox->GetStylePosition();

    // same for min size. Unfortunately min size is always set to 0. So for now
    // we will assume 0 means not set.
    if (position->mMinWidth.GetUnit() == eStyleUnit_Coord) {
        nscoord min = position->mMinWidth.GetCoordValue();
        if (min && (!widthSet || (min > aSize.width && canOverride))) {
           aSize.width = min;
           widthSet = PR_TRUE;
        }
    } else if (position->mMinWidth.GetUnit() == eStyleUnit_Percent) {
        NS_ASSERTION(position->mMinWidth.GetPercentValue() == 0.0f,
          "Non-zero percentage values not currently supported");
        aSize.width = 0;
        widthSet = PR_TRUE;
    }
    // XXX Handle eStyleUnit_Enumerated?
    // (Handling the eStyleUnit_Enumerated types requires
    // GetPrefSize/GetMinSize methods that don't consider
    // (min-/max-/)(width/height) properties.

    if (position->mMinHeight.GetUnit() == eStyleUnit_Coord) {
        nscoord min = position->mMinHeight.GetCoordValue();
        if (min && (!heightSet || (min > aSize.height && canOverride))) {
           aSize.height = min;
           heightSet = PR_TRUE;
        }
    } else if (position->mMinHeight.GetUnit() == eStyleUnit_Percent) {
        NS_ASSERTION(position->mMinHeight.GetPercentValue() == 0.0f,
          "Non-zero percentage values not currently supported");
        aSize.height = 0;
        heightSet = PR_TRUE;
    }

    nsIContent* content = aBox->GetContent();
    if (content) {
        nsAutoString value;
        PRInt32 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;
            widthSet = PR_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;

            heightSet = PR_TRUE;
        }
    }

    return (widthSet && heightSet);
}

nsresult
nsBox::SyncLayout(nsBoxLayoutState& aState)
{
  /*
  PRBool collapsed = PR_FALSE;
  IsCollapsed(aState, collapsed);
  if (collapsed) {
    CollapseChild(aState, this, PR_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();

  PRUint32 flags = 0;
  GetLayoutFlags(flags);

  PRUint32 stateFlags = aState.LayoutFlags();

  flags |= stateFlags;

  nsRect rect(nsPoint(0, 0), GetSize());

  if (ComputesOwnOverflowArea()) {
    rect = GetOverflowRect();
  }
  else {
    if (!DoesClipChildren() && !IsCollapsed(aState)) {
      // 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).
      nsIFrame* box = GetChildBox();
      while (box) {
        nsRect bounds = box->GetOverflowRect() + box->GetPosition();
        rect.UnionRect(rect, bounds);

        box = box->GetNextBox();
      }
    }

    FinishAndStoreOverflow(&rect, GetSize());
  }

  nsIView* view = GetView();
  if (view) {
    // Make sure the frame's view is properly sized and positioned and has
    // things like opacity correct
    nsHTMLContainerFrame::SyncFrameViewAfterReflow(
                             presContext, 
                             this,
                             view,
                             &rect,
                             flags);
  } 

  return NS_OK;
}

nscoord
nsListBoxBodyFrame::ComputeIntrinsicWidth(nsBoxLayoutState& aBoxLayoutState)
{
  if (mStringWidth != -1)
    return mStringWidth;

  nscoord largestWidth = 0;

  PRInt32 index = 0;
  nsCOMPtr<nsIDOMElement> firstRowEl;
  GetItemAtIndex(index, getter_AddRefs(firstRowEl));
  nsCOMPtr<nsIContent> firstRowContent(do_QueryInterface(firstRowEl));

  if (firstRowContent) {
    nsRefPtr<nsStyleContext> styleContext;
    nsPresContext *presContext = aBoxLayoutState.PresContext();
    styleContext = presContext->StyleSet()->
      ResolveStyleFor(firstRowContent->AsElement(), nsnull);

    nscoord width = 0;
    nsMargin margin(0,0,0,0);

    if (styleContext->GetStylePadding()->GetPadding(margin))
      width += margin.LeftRight();
    width += styleContext->GetStyleBorder()->GetActualBorder().LeftRight();
    if (styleContext->GetStyleMargin()->GetMargin(margin))
      width += margin.LeftRight();


    ChildIterator iter, last;
    PRUint32 i = 0;
    for (ChildIterator::Init(mContent, &iter, &last);
         iter != last && i < 100;
         ++iter, ++i) {
      nsIContent *child = (*iter);

      if (child->Tag() == nsGkAtoms::listitem) {
        nsRenderingContext* rendContext = aBoxLayoutState.GetRenderingContext();
        if (rendContext) {
          nsAutoString value;
          PRUint32 textCount = child->GetChildCount();
          for (PRUint32 j = 0; j < textCount; ++j) {
            nsIContent* text = child->GetChildAt(j);
            if (text && text->IsNodeOfType(nsINode::eTEXT)) {
              text->AppendTextTo(value);
            }
          }

          nsRefPtr<nsFontMetrics> fm;
          nsLayoutUtils::GetFontMetricsForStyleContext(styleContext,
                                                       getter_AddRefs(fm));
          rendContext->SetFont(fm);

          nscoord textWidth =
            nsLayoutUtils::GetStringWidth(this, rendContext, value.get(), value.Length());
          textWidth += width;

          if (textWidth > largestWidth) 
            largestWidth = textWidth;
        }
      }
    }
  }

  mStringWidth = largestWidth;
  return mStringWidth;
}

nscoord
nsListBoxBodyFrame::ComputeIntrinsicWidth(nsBoxLayoutState& aBoxLayoutState)
{
  if (mStringWidth != -1)
    return mStringWidth;

  nscoord largestWidth = 0;

  PRInt32 index = 0;
  nsCOMPtr<nsIDOMElement> firstRowEl;
  GetItemAtIndex(index, getter_AddRefs(firstRowEl));
  nsCOMPtr<nsIContent> firstRowContent(do_QueryInterface(firstRowEl));

  if (firstRowContent) {
    nsRefPtr<nsStyleContext> styleContext;
    nsPresContext *presContext = aBoxLayoutState.PresContext();
    styleContext = presContext->StyleSet()->
      ResolveStyleFor(firstRowContent, nsnull);

    nscoord width = 0;
    nsMargin margin(0,0,0,0);

    if (styleContext->GetStylePadding()->GetPadding(margin))
      width += margin.LeftRight();
    width += styleContext->GetStyleBorder()->GetBorder().LeftRight();
    if (styleContext->GetStyleMargin()->GetMargin(margin))
      width += margin.LeftRight();

    nsIContent* listbox = mContent->GetBindingParent();
    NS_ENSURE_TRUE(listbox, largestWidth);

    PRUint32 childCount = listbox->GetChildCount();

    for (PRUint32 i = 0; i < childCount && i < 100; ++i) {
      nsIContent *child = listbox->GetChildAt(i);

      if (child->Tag() == nsGkAtoms::listitem) {
        nsIRenderingContext* rendContext = aBoxLayoutState.GetRenderingContext();
        if (rendContext) {
          nsAutoString value;
          PRUint32 textCount = child->GetChildCount();
          for (PRUint32 j = 0; j < textCount; ++j) {
            nsIContent* text = child->GetChildAt(j);
            if (text && text->IsNodeOfType(nsINode::eTEXT)) {
              text->AppendTextTo(value);
            }
          }

          nsLayoutUtils::SetFontFromStyle(rendContext, styleContext);

          nscoord textWidth =
            nsLayoutUtils::GetStringWidth(this, rendContext, value.get(), value.Length());
          textWidth += width;

          if (textWidth > largestWidth) 
            largestWidth = textWidth;
        }
      }
    }
  }

  mStringWidth = largestWidth;
  return mStringWidth;
}