DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (920bcf17a9e1)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * rendering object that is the root of the frame tree, which contains
 * the document's scrollbars and contains fixed-positioned elements
 */

#include "nsCOMPtr.h"
#include "nsViewportFrame.h"
#include "nsHTMLParts.h"
#include "nsGkAtoms.h"
#include "nsIScrollableFrame.h"
#include "nsDisplayList.h"

nsIFrame*
NS_NewViewportFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) ViewportFrame(aContext);
}

NS_IMETHODIMP
ViewportFrame::Init(nsIContent*      aContent,
                    nsIFrame*        aParent,
                    nsIFrame*        aPrevInFlow)
{
  return Super::Init(aContent, aParent, aPrevInFlow);
}

void
ViewportFrame::Destroy()
{
  mFixedContainer.DestroyFrames(this);
  nsContainerFrame::Destroy();
}

NS_IMETHODIMP
ViewportFrame::SetInitialChildList(nsIAtom*        aListName,
                                   nsIFrame*       aChildList)
{
  nsresult rv = NS_OK;

  // See which child list to add the frames to
#ifdef NS_DEBUG
  nsFrame::VerifyDirtyBitSet(aChildList);
#endif
  if (nsGkAtoms::fixedList == aListName) {
    rv = mFixedContainer.SetInitialChildList(this, aListName, aChildList);
  } 
  else {
    rv = nsContainerFrame::SetInitialChildList(aListName, aChildList);
  }

  return rv;
}

NS_IMETHODIMP
ViewportFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsRect&           aDirtyRect,
                                const nsDisplayListSet& aLists)
{
  // We don't need any special painting or event handling. We just need to
  // mark our visible out-of-flow frames (i.e., the fixed position frames) so
  // that display list construction is guaranteed to recurse into their
  // ancestors.
  aBuilder->MarkFramesForDisplayList(this, mFixedContainer.GetFirstChild(), aDirtyRect);

  nsIFrame* kid = mFrames.FirstChild();
  if (!kid)
    return NS_OK;

  // make the kid's BorderBackground our own. This ensures that the canvas
  // frame's background becomes our own background and therefore appears
  // below negative z-index elements.
  return BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
}

NS_IMETHODIMP
ViewportFrame::AppendFrames(nsIAtom*        aListName,
                            nsIFrame*       aFrameList)
{
  nsresult rv = NS_OK;

  if (nsGkAtoms::fixedList == aListName) {
    rv = mFixedContainer.AppendFrames(this, aListName, aFrameList);
  }
  else {
    // We only expect incremental changes for our fixed frames
    NS_ERROR("unexpected child list");
    rv = NS_ERROR_INVALID_ARG;
  }

  return rv;
}

NS_IMETHODIMP
ViewportFrame::InsertFrames(nsIAtom*        aListName,
                            nsIFrame*       aPrevFrame,
                            nsIFrame*       aFrameList)
{
  nsresult rv = NS_OK;

  if (nsGkAtoms::fixedList == aListName) {
    rv = mFixedContainer.InsertFrames(this, aListName, aPrevFrame, aFrameList);
  }
  else {
    // We only expect incremental changes for our fixed frames
    NS_ERROR("unexpected child list");
    rv = NS_ERROR_INVALID_ARG;
  }

  return rv;
}

NS_IMETHODIMP
ViewportFrame::RemoveFrame(nsIAtom*        aListName,
                           nsIFrame*       aOldFrame)
{
  nsresult rv = NS_OK;

  if (nsGkAtoms::fixedList == aListName) {
    rv = mFixedContainer.RemoveFrame(this, aListName, aOldFrame);
  }
  else {
    // We only expect incremental changes for our fixed frames
    NS_ERROR("unexpected child list");
    rv = NS_ERROR_INVALID_ARG;
  }

  return rv;
}

nsIAtom*
ViewportFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
  NS_PRECONDITION(aIndex >= 0, "illegal index");

  if (0 == aIndex) {
    return nsGkAtoms::fixedList;
  }

  return nsnull;
}

nsIFrame*
ViewportFrame::GetFirstChild(nsIAtom* aListName) const
{
  if (nsGkAtoms::fixedList == aListName)
    return mFixedContainer.GetFirstChild();

  return nsContainerFrame::GetFirstChild(aListName);
}

/* virtual */ nscoord
ViewportFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
  nscoord result;
  DISPLAY_MIN_WIDTH(this, result);
  if (mFrames.IsEmpty())
    result = 0;
  else
    result = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
    
  // XXXldb Deal with mFixedContainer (matters for SizeToContent)!

  return result;
}

/* virtual */ nscoord
ViewportFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
  nscoord result;
  DISPLAY_PREF_WIDTH(this, result);
  if (mFrames.IsEmpty())
    result = 0;
  else
    result = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
    
  // XXXldb Deal with mFixedContainer (matters for SizeToContent)!

  return result;
}

nsPoint
ViewportFrame::AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const
{
  // Calculate how much room is available for fixed frames. That means
  // determining if the viewport is scrollable and whether the vertical and/or
  // horizontal scrollbars are visible

  // Get our prinicpal child frame and see if we're scrollable
  nsIFrame* kidFrame = mFrames.FirstChild();
  nsCOMPtr<nsIScrollableFrame> scrollingFrame(do_QueryInterface(kidFrame));

  if (scrollingFrame) {
    nsMargin scrollbars = scrollingFrame->GetActualScrollbarSizes();
    aReflowState->SetComputedWidth(aReflowState->ComputedWidth() -
                                   scrollbars.LeftRight());
    aReflowState->availableWidth -= scrollbars.LeftRight();
    aReflowState->SetComputedHeightWithoutResettingResizeFlags(
      aReflowState->ComputedHeight() - scrollbars.TopBottom());
    return nsPoint(scrollbars.left, scrollbars.top);
  }
  return nsPoint(0, 0);
}

NS_IMETHODIMP
ViewportFrame::Reflow(nsPresContext*           aPresContext,
                      nsHTMLReflowMetrics&     aDesiredSize,
                      const nsHTMLReflowState& aReflowState,
                      nsReflowStatus&          aStatus)
{
  DO_GLOBAL_REFLOW_COUNT("ViewportFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");

  // Initialize OUT parameters
  aStatus = NS_FRAME_COMPLETE;

  // Because |Reflow| sets mComputedHeight on the child to
  // availableHeight.
  AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
  
  // Reflow the main content first so that the placeholders of the
  // fixed-position frames will be in the right places on an initial
  // reflow.
  nscoord kidHeight = 0;

  nsresult rv = NS_OK;
  
  if (mFrames.NotEmpty()) {
    // Deal with a non-incremental reflow or an incremental reflow
    // targeted at our one-and-only principal child frame.
    if (aReflowState.ShouldReflowAllKids() ||
        aReflowState.mFlags.mVResize ||
        NS_SUBTREE_DIRTY(mFrames.FirstChild())) {
      // Reflow our one-and-only principal child frame
      nsIFrame*           kidFrame = mFrames.FirstChild();
      nsHTMLReflowMetrics kidDesiredSize;
      nsSize              availableSpace(aReflowState.availableWidth,
                                         aReflowState.availableHeight);
      nsHTMLReflowState   kidReflowState(aPresContext, aReflowState,
                                         kidFrame, availableSpace);

      // Reflow the frame
      kidReflowState.SetComputedHeight(aReflowState.ComputedHeight());
      rv = ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
                       0, 0, 0, aStatus);
      kidHeight = kidDesiredSize.height;

      FinishReflowChild(kidFrame, aPresContext, nsnull, kidDesiredSize, 0, 0, 0);
    } else {
      kidHeight = mFrames.FirstChild()->GetSize().height;
    }
  }

  NS_ASSERTION(aReflowState.availableWidth != NS_UNCONSTRAINEDSIZE,
               "shouldn't happen anymore");

  // Return the max size as our desired size
  aDesiredSize.width = aReflowState.availableWidth;
  // Being flowed initially at an unconstrained height means we should
  // return our child's intrinsic size.
  aDesiredSize.height = aReflowState.ComputedHeight() != NS_UNCONSTRAINEDSIZE
                          ? aReflowState.ComputedHeight()
                          : kidHeight;

  // Make a copy of the reflow state and change the computed width and height
  // to reflect the available space for the fixed items
  nsHTMLReflowState reflowState(aReflowState);
  nsPoint offset = AdjustReflowStateForScrollbars(&reflowState);
  
#ifdef DEBUG
  nsIFrame* f = mFixedContainer.GetFirstChild();
  NS_ASSERTION(!f || (offset.x == 0 && offset.y == 0),
               "We don't handle correct positioning of fixed frames with "
               "scrollbars in odd positions");
#endif

  // Just reflow all the fixed-pos frames.
  rv = mFixedContainer.Reflow(this, aPresContext, reflowState, aStatus,
                              reflowState.ComputedWidth(),
                              reflowState.ComputedHeight(),
                              PR_FALSE, PR_TRUE, PR_TRUE); // XXX could be optimized

  // If we were dirty then do a repaint
  if (GetStateBits() & NS_FRAME_IS_DIRTY) {
    nsRect damageRect(0, 0, aDesiredSize.width, aDesiredSize.height);
    Invalidate(damageRect);
  }

  // XXX Should we do something to clip our children to this?
  aDesiredSize.mOverflowArea =
    nsRect(nsPoint(0, 0), nsSize(aDesiredSize.width, aDesiredSize.height));

  NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
  return rv; 
}

nsIAtom*
ViewportFrame::GetType() const
{
  return nsGkAtoms::viewportFrame;
}

/* virtual */ PRBool
ViewportFrame::IsContainingBlock() const
{
  return PR_TRUE;
}

void
ViewportFrame::InvalidateInternal(const nsRect& aDamageRect,
                                  nscoord aX, nscoord aY, nsIFrame* aForChild,
                                  PRUint32 aFlags)
{
  nsRect r = aDamageRect + nsPoint(aX, aY);
  PresContext()->NotifyInvalidation(r, (aFlags & INVALIDATE_CROSS_DOC) != 0);

  nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(this);
  if (parent) {
    nsPoint pt = GetOffsetTo(parent);
    parent->InvalidateInternal(r, pt.x, pt.y, this,
                               aFlags | INVALIDATE_CROSS_DOC);
    return;
  }
  InvalidateRoot(r, aFlags);
}

#ifdef DEBUG
NS_IMETHODIMP
ViewportFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("Viewport"), aResult);
}
#endif