LCOV - code coverage report
Current view: directory - layout/generic - nsViewportFrame.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 118 0 0.0 %
Date: 2012-06-02 Functions: 17 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /*
      39                 :  * rendering object that is the root of the frame tree, which contains
      40                 :  * the document's scrollbars and contains fixed-positioned elements
      41                 :  */
      42                 : 
      43                 : #include "nsCOMPtr.h"
      44                 : #include "nsViewportFrame.h"
      45                 : #include "nsHTMLParts.h"
      46                 : #include "nsGkAtoms.h"
      47                 : #include "nsIScrollableFrame.h"
      48                 : #include "nsDisplayList.h"
      49                 : #include "FrameLayerBuilder.h"
      50                 : #include "nsSubDocumentFrame.h"
      51                 : #include "nsAbsoluteContainingBlock.h"
      52                 : 
      53                 : using namespace mozilla;
      54                 : 
      55                 : nsIFrame*
      56               0 : NS_NewViewportFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
      57                 : {
      58               0 :   return new (aPresShell) ViewportFrame(aContext);
      59                 : }
      60                 : 
      61               0 : NS_IMPL_FRAMEARENA_HELPERS(ViewportFrame)
      62                 : 
      63                 : NS_IMETHODIMP
      64               0 : ViewportFrame::Init(nsIContent*      aContent,
      65                 :                     nsIFrame*        aParent,
      66                 :                     nsIFrame*        aPrevInFlow)
      67                 : {
      68               0 :   return Super::Init(aContent, aParent, aPrevInFlow);
      69                 : }
      70                 : 
      71                 : void
      72               0 : ViewportFrame::DestroyFrom(nsIFrame* aDestructRoot)
      73                 : {
      74               0 :   DestroyAbsoluteFrames(aDestructRoot);
      75               0 :   nsContainerFrame::DestroyFrom(aDestructRoot);
      76               0 : }
      77                 : 
      78                 : NS_IMETHODIMP
      79               0 : ViewportFrame::SetInitialChildList(ChildListID     aListID,
      80                 :                                    nsFrameList&    aChildList)
      81                 : {
      82                 :   // See which child list to add the frames to
      83                 : #ifdef NS_DEBUG
      84               0 :   nsFrame::VerifyDirtyBitSet(aChildList);
      85                 : #endif
      86               0 :   return nsContainerFrame::SetInitialChildList(aListID, aChildList);
      87                 : }
      88                 : 
      89                 : NS_IMETHODIMP
      90               0 : ViewportFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
      91                 :                                 const nsRect&           aDirtyRect,
      92                 :                                 const nsDisplayListSet& aLists)
      93                 : {
      94               0 :   nsIFrame* kid = mFrames.FirstChild();
      95               0 :   if (!kid)
      96               0 :     return NS_OK;
      97                 : 
      98                 :   // make the kid's BorderBackground our own. This ensures that the canvas
      99                 :   // frame's background becomes our own background and therefore appears
     100                 :   // below negative z-index elements.
     101               0 :   return BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
     102                 : }
     103                 : 
     104                 : NS_IMETHODIMP
     105               0 : ViewportFrame::AppendFrames(ChildListID     aListID,
     106                 :                             nsFrameList&    aFrameList)
     107                 : {
     108               0 :   NS_ASSERTION(aListID == kPrincipalList ||
     109                 :                aListID == GetAbsoluteListID(), "unexpected child list");
     110               0 :   NS_ASSERTION(aListID != GetAbsoluteListID() ||
     111                 :                GetChildList(aListID).IsEmpty(), "Shouldn't have any kids!");
     112               0 :   return nsContainerFrame::AppendFrames(aListID, aFrameList);
     113                 : }
     114                 : 
     115                 : NS_IMETHODIMP
     116               0 : ViewportFrame::InsertFrames(ChildListID     aListID,
     117                 :                             nsIFrame*       aPrevFrame,
     118                 :                             nsFrameList&    aFrameList)
     119                 : {
     120               0 :   NS_ASSERTION(aListID == kPrincipalList ||
     121                 :                aListID == GetAbsoluteListID(), "unexpected child list");
     122               0 :   NS_ASSERTION(aListID != GetAbsoluteListID() ||
     123                 :                GetChildList(aListID).IsEmpty(), "Shouldn't have any kids!");
     124               0 :   return nsContainerFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
     125                 : }
     126                 : 
     127                 : NS_IMETHODIMP
     128               0 : ViewportFrame::RemoveFrame(ChildListID     aListID,
     129                 :                            nsIFrame*       aOldFrame)
     130                 : {
     131               0 :   NS_ASSERTION(aListID == kPrincipalList ||
     132                 :                aListID == GetAbsoluteListID(), "unexpected child list");
     133               0 :   return nsContainerFrame::RemoveFrame(aListID, aOldFrame);
     134                 : }
     135                 : 
     136                 : /* virtual */ nscoord
     137               0 : ViewportFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
     138                 : {
     139                 :   nscoord result;
     140               0 :   DISPLAY_MIN_WIDTH(this, result);
     141               0 :   if (mFrames.IsEmpty())
     142               0 :     result = 0;
     143                 :   else
     144               0 :     result = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
     145                 : 
     146               0 :   return result;
     147                 : }
     148                 : 
     149                 : /* virtual */ nscoord
     150               0 : ViewportFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
     151                 : {
     152                 :   nscoord result;
     153               0 :   DISPLAY_PREF_WIDTH(this, result);
     154               0 :   if (mFrames.IsEmpty())
     155               0 :     result = 0;
     156                 :   else
     157               0 :     result = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
     158                 : 
     159               0 :   return result;
     160                 : }
     161                 : 
     162                 : nsPoint
     163               0 : ViewportFrame::AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const
     164                 : {
     165                 :   // Calculate how much room is available for fixed frames. That means
     166                 :   // determining if the viewport is scrollable and whether the vertical and/or
     167                 :   // horizontal scrollbars are visible
     168                 : 
     169                 :   // Get our prinicpal child frame and see if we're scrollable
     170               0 :   nsIFrame* kidFrame = mFrames.FirstChild();
     171               0 :   nsIScrollableFrame *scrollingFrame = do_QueryFrame(kidFrame);
     172                 : 
     173               0 :   if (scrollingFrame) {
     174               0 :     nsMargin scrollbars = scrollingFrame->GetActualScrollbarSizes();
     175               0 :     aReflowState->SetComputedWidth(aReflowState->ComputedWidth() -
     176               0 :                                    scrollbars.LeftRight());
     177               0 :     aReflowState->availableWidth -= scrollbars.LeftRight();
     178                 :     aReflowState->SetComputedHeightWithoutResettingResizeFlags(
     179               0 :       aReflowState->ComputedHeight() - scrollbars.TopBottom());
     180               0 :     return nsPoint(scrollbars.left, scrollbars.top);
     181                 :   }
     182               0 :   return nsPoint(0, 0);
     183                 : }
     184                 : 
     185                 : NS_IMETHODIMP
     186               0 : ViewportFrame::Reflow(nsPresContext*           aPresContext,
     187                 :                       nsHTMLReflowMetrics&     aDesiredSize,
     188                 :                       const nsHTMLReflowState& aReflowState,
     189                 :                       nsReflowStatus&          aStatus)
     190                 : {
     191               0 :   DO_GLOBAL_REFLOW_COUNT("ViewportFrame");
     192               0 :   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
     193               0 :   NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");
     194                 : 
     195                 :   // Initialize OUT parameters
     196               0 :   aStatus = NS_FRAME_COMPLETE;
     197                 : 
     198                 :   // Because |Reflow| sets mComputedHeight on the child to
     199                 :   // availableHeight.
     200               0 :   AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
     201                 : 
     202                 :   // Set our size up front, since some parts of reflow depend on it
     203                 :   // being already set.  Note that the computed height may be
     204                 :   // unconstrained; that's ok.  Consumers should watch out for that.
     205               0 :   SetSize(nsSize(aReflowState.ComputedWidth(), aReflowState.ComputedHeight()));
     206                 :  
     207                 :   // Reflow the main content first so that the placeholders of the
     208                 :   // fixed-position frames will be in the right places on an initial
     209                 :   // reflow.
     210               0 :   nscoord kidHeight = 0;
     211                 : 
     212               0 :   nsresult rv = NS_OK;
     213                 :   
     214               0 :   if (mFrames.NotEmpty()) {
     215                 :     // Deal with a non-incremental reflow or an incremental reflow
     216                 :     // targeted at our one-and-only principal child frame.
     217               0 :     if (aReflowState.ShouldReflowAllKids() ||
     218                 :         aReflowState.mFlags.mVResize ||
     219               0 :         NS_SUBTREE_DIRTY(mFrames.FirstChild())) {
     220                 :       // Reflow our one-and-only principal child frame
     221               0 :       nsIFrame*           kidFrame = mFrames.FirstChild();
     222               0 :       nsHTMLReflowMetrics kidDesiredSize;
     223                 :       nsSize              availableSpace(aReflowState.availableWidth,
     224               0 :                                          aReflowState.availableHeight);
     225                 :       nsHTMLReflowState   kidReflowState(aPresContext, aReflowState,
     226               0 :                                          kidFrame, availableSpace);
     227                 : 
     228                 :       // Reflow the frame
     229               0 :       kidReflowState.SetComputedHeight(aReflowState.ComputedHeight());
     230                 :       rv = ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
     231               0 :                        0, 0, 0, aStatus);
     232               0 :       kidHeight = kidDesiredSize.height;
     233                 : 
     234               0 :       FinishReflowChild(kidFrame, aPresContext, nsnull, kidDesiredSize, 0, 0, 0);
     235                 :     } else {
     236               0 :       kidHeight = mFrames.FirstChild()->GetSize().height;
     237                 :     }
     238                 :   }
     239                 : 
     240               0 :   NS_ASSERTION(aReflowState.availableWidth != NS_UNCONSTRAINEDSIZE,
     241                 :                "shouldn't happen anymore");
     242                 : 
     243                 :   // Return the max size as our desired size
     244               0 :   aDesiredSize.width = aReflowState.availableWidth;
     245                 :   // Being flowed initially at an unconstrained height means we should
     246                 :   // return our child's intrinsic size.
     247               0 :   aDesiredSize.height = aReflowState.ComputedHeight() != NS_UNCONSTRAINEDSIZE
     248                 :                           ? aReflowState.ComputedHeight()
     249               0 :                           : kidHeight;
     250               0 :   aDesiredSize.SetOverflowAreasToDesiredBounds();
     251                 : 
     252               0 :   if (mFrames.NotEmpty()) {
     253               0 :     ConsiderChildOverflow(aDesiredSize.mOverflowAreas, mFrames.FirstChild());
     254                 :   }
     255                 : 
     256                 :   // Make a copy of the reflow state and change the computed width and height
     257                 :   // to reflect the available space for the fixed items
     258               0 :   nsHTMLReflowState reflowState(aReflowState);
     259               0 :   nsPoint offset = AdjustReflowStateForScrollbars(&reflowState);
     260                 : 
     261               0 :   if (IsAbsoluteContainer()) {
     262               0 :     NS_ASSERTION(GetAbsoluteContainingBlock()->GetChildList().IsEmpty() ||
     263                 :                  (offset.x == 0 && offset.y == 0),
     264                 :                  "We don't handle correct positioning of fixed frames with "
     265                 :                  "scrollbars in odd positions");
     266                 : 
     267                 :     // Just reflow all the fixed-pos frames.
     268                 :     rv = GetAbsoluteContainingBlock()->Reflow(this, aPresContext, reflowState, aStatus,
     269                 :                                               reflowState.ComputedWidth(),
     270                 :                                               reflowState.ComputedHeight(),
     271                 :                                               false, true, true, // XXX could be optimized
     272               0 :                                               &aDesiredSize.mOverflowAreas);
     273                 :   }
     274                 : 
     275                 :   // If we were dirty then do a repaint
     276               0 :   if (GetStateBits() & NS_FRAME_IS_DIRTY) {
     277               0 :     nsRect damageRect(0, 0, aDesiredSize.width, aDesiredSize.height);
     278               0 :     Invalidate(damageRect);
     279                 :   }
     280                 : 
     281                 :   // Clipping is handled by the document container (e.g., nsSubDocumentFrame),
     282                 :   // so we don't need to change our overflow areas.
     283               0 :   bool overflowChanged = FinishAndStoreOverflow(&aDesiredSize);
     284               0 :   if (overflowChanged) {
     285                 :     // We may need to alert our container to get it to pick up the
     286                 :     // overflow change.
     287                 :     nsSubDocumentFrame* container = static_cast<nsSubDocumentFrame*>
     288               0 :       (nsLayoutUtils::GetCrossDocParentFrame(this));
     289               0 :     if (container && !container->ShouldClipSubdocument()) {
     290               0 :       container->PresContext()->PresShell()->
     291               0 :         FrameNeedsReflow(container, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
     292                 :     }
     293                 :   }
     294                 : 
     295               0 :   NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
     296               0 :   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
     297               0 :   return rv; 
     298                 : }
     299                 : 
     300                 : nsIAtom*
     301               0 : ViewportFrame::GetType() const
     302                 : {
     303               0 :   return nsGkAtoms::viewportFrame;
     304                 : }
     305                 : 
     306                 : void
     307               0 : ViewportFrame::InvalidateInternal(const nsRect& aDamageRect,
     308                 :                                   nscoord aX, nscoord aY, nsIFrame* aForChild,
     309                 :                                   PRUint32 aFlags)
     310                 : {
     311               0 :   nsRect r = aDamageRect + nsPoint(aX, aY);
     312               0 :   nsPresContext* presContext = PresContext();
     313               0 :   presContext->NotifyInvalidation(r, aFlags);
     314                 : 
     315               0 :   if ((mState & NS_FRAME_HAS_CONTAINER_LAYER) &&
     316               0 :       !(aFlags & INVALIDATE_NO_THEBES_LAYERS)) {
     317               0 :     FrameLayerBuilder::InvalidateThebesLayerContents(this, r);
     318                 :     // Don't need to invalidate any more Thebes layers
     319               0 :     aFlags |= INVALIDATE_NO_THEBES_LAYERS;
     320               0 :     if (aFlags & INVALIDATE_ONLY_THEBES_LAYERS) {
     321                 :       return;
     322                 :     }
     323                 :   }
     324                 : 
     325               0 :   nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(this);
     326               0 :   if (parent) {
     327               0 :     if (!presContext->PresShell()->IsActive())
     328                 :       return;
     329               0 :     nsPoint pt = -parent->GetOffsetToCrossDoc(this);
     330               0 :     PRInt32 ourAPD = presContext->AppUnitsPerDevPixel();
     331               0 :     PRInt32 parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
     332               0 :     r = r.ConvertAppUnitsRoundOut(ourAPD, parentAPD);
     333                 :     parent->InvalidateInternal(r, pt.x, pt.y, this,
     334               0 :                                aFlags | INVALIDATE_CROSS_DOC);
     335                 :     return;
     336                 :   }
     337               0 :   InvalidateRoot(r, aFlags);
     338                 : }
     339                 : 
     340                 : #ifdef DEBUG
     341                 : NS_IMETHODIMP
     342               0 : ViewportFrame::GetFrameName(nsAString& aResult) const
     343                 : {
     344               0 :   return MakeFrameName(NS_LITERAL_STRING("Viewport"), aResult);
     345                 : }
     346                 : #endif

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