gecko-dev/layout/generic/nsQueryFrame.h

/* ***** 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 the Mozilla layout engine.
 *
 * The Initial Developer of the Original Code is
 * the Mozilla Foundation <http://www.mozilla.org/>.
 *
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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 ***** */

#ifndef nsQueryFrame_h
#define nsQueryFrame_h

#include "nscore.h"

#define NS_DECL_QUERYFRAME_TARGET(classname)                    \
  static const nsQueryFrame::FrameIID kFrameIID = nsQueryFrame::classname##_id;

#define NS_DECL_QUERYFRAME                                      \
  virtual void* QueryFrame(FrameIID id);

#define NS_QUERYFRAME_HEAD(class)                               \
  void* class::QueryFrame(FrameIID id) { switch (id) {

#define NS_QUERYFRAME_ENTRY(class)                              \
  case class::kFrameIID: return static_cast<class*>(this);

#define NS_QUERYFRAME_ENTRY_CONDITIONAL(class, condition)       \
  case class::kFrameIID:                                        \
  if (condition) return static_cast<class*>(this);              \
  break;

#define NS_QUERYFRAME_TAIL_INHERITING(class)                    \
  default: break;                                               \
  }                                                             \
  return class::QueryFrame(id);                                 \
}

#define NS_QUERYFRAME_TAIL_INHERITANCE_ROOT                     \
  default: break;                                               \
  }                                                             \
  return nsnull;                                                \
}

class nsQueryFrame
{
public:
  enum FrameIID {
    BRFrame_id,
    nsAutoRepeatBoxFrame_id,
    nsBCTableCellFrame_id,
    nsBlockFrame_id,
    nsBox_id,
    nsBoxFrame_id,
    nsBulletFrame_id,
    nsButtonBoxFrame_id,
    nsCanvasFrame_id,
    nsColumnSetFrame_id,
    nsComboboxControlFrame_id,
    nsComboboxDisplayFrame_id,
    nsContainerFrame_id,
    nsContinuingTextFrame_id,
    nsDeckFrame_id,
    nsDocElementBoxFrame_id,
    nsFieldSetFrame_id,
    nsFileControlFrame_id,
    nsFirstLetterFrame_id,
    nsFirstLineFrame_id,
    nsFormControlFrame_id,
    nsFrame_id,
    nsGfxButtonControlFrame_id,
    nsGfxCheckboxControlFrame_id,
    nsGfxRadioControlFrame_id,
    nsGridRowGroupFrame_id,
    nsGridRowLeafFrame_id,
    nsGroupBoxFrame_id,
    nsHTMLButtonControlFrame_id,
    nsHTMLCanvasFrame_id,
    nsHTMLContainerFrame_id,
    nsHTMLFramesetBlankFrame_id,
    nsHTMLFramesetBorderFrame_id,
    nsHTMLFramesetFrame_id,
    nsHTMLScrollFrame_id,
    nsIAnonymousContentCreator_id,
    nsIComboboxControlFrame_id,
    nsIFormControlFrame_id,
    nsIFrame_id,
    nsIFrameFrame_id,
    nsIImageFrame_id,
    nsIListControlFrame_id,
    nsIMathMLFrame_id,
    nsIMenuFrame_id,
    nsIObjectFrame_id,
    nsIPageSequenceFrame_id,
    nsIPercentHeightObserver_id,
    nsIRootBox_id,
    nsISVGChildFrame_id,
    nsISVGGlyphFragmentLeaf_id,
    nsISVGGlyphFragmentNode_id,
    nsISVGSVGFrame_id,
    nsIScrollableFrame_id,
    nsIScrollbarFrame_id,
    nsIScrollbarMediator_id,
    nsISelectControlFrame_id,
    nsIStatefulFrame_id,
    nsITableCellLayout_id,
    nsITableLayout_id,
    nsITextControlFrame_id,
    nsITreeBoxObject_id,
    nsImageBoxFrame_id,
    nsImageControlFrame_id,
    nsImageFrame_id,
    nsInlineFrame_id,
    nsIsIndexFrame_id,
    nsLeafBoxFrame_id,
    nsLeafFrame_id,
    nsLegendFrame_id,
    nsListBoxBodyFrame_id,
    nsListControlFrame_id,
    nsListItemFrame_id,
    nsMathMLContainerFrame_id,
    nsMathMLForeignFrameWrapper_id,
    nsMathMLFrame_id,
    nsMathMLmactionFrame_id,
    nsMathMLmathBlockFrame_id,
    nsMathMLmathInlineFrame_id,
    nsMathMLmencloseFrame_id,
    nsMathMLmfencedFrame_id,
    nsMathMLmfracFrame_id,
    nsMathMLmmultiscriptsFrame_id,
    nsMathMLmoFrame_id,
    nsMathMLmoverFrame_id,
    nsMathMLmpaddedFrame_id,
    nsMathMLmphantomFrame_id,
    nsMathMLmrootFrame_id,
    nsMathMLmrowFrame_id,
    nsMathMLmspaceFrame_id,
    nsMathMLmsqrtFrame_id,
    nsMathMLmstyleFrame_id,
    nsMathMLmsubFrame_id,
    nsMathMLmsubsupFrame_id,
    nsMathMLmsupFrame_id,
    nsMathMLmtableFrame_id,
    nsMathMLmtableOuterFrame_id,
    nsMathMLmtdFrame_id,
    nsMathMLmtdInnerFrame_id,
    nsMathMLmtrFrame_id,
    nsMathMLmunderFrame_id,
    nsMathMLmunderoverFrame_id,
    nsMathMLsemanticsFrame_id,
    nsMathMLTokenFrame_id,
    nsMenuBarFrame_id,
    nsMenuFrame_id,
    nsMenuPopupFrame_id,
    nsObjectFrame_id,
    nsPageBreakFrame_id,
    nsPageContentFrame_id,
    nsPageFrame_id,
    nsPlaceholderFrame_id,
    nsPopupSetFrame_id,
    nsPositionedInlineFrame_id,
    nsProgressMeterFrame_id,
    nsResizerFrame_id,
    nsRootBoxFrame_id,
    nsScrollbarButtonFrame_id,
    nsScrollbarFrame_id,
    nsSelectsAreaFrame_id,
    nsSimplePageSequenceFrame_id,
    nsSliderFrame_id,
    nsSplittableFrame_id,
    nsSplitterFrame_id,
    nsStackFrame_id,
    nsSubDocumentFrame_id,
    nsSVGAFrame_id,
    nsSVGClipPathFrame_id,
    nsSVGContainerFrame_id,
    nsSVGDisplayContainerFrame_id,
    nsSVGFilterFrame_id,
    nsSVGForeignObjectFrame_id,
    nsSVGGenericContainerFrame_id,
    nsSVGGeometryFrame_id,
    nsSVGGFrame_id,
    nsSVGGlyphFrame_id,
    nsSVGGradientFrame_id,
    nsSVGImageFrame_id,
    nsSVGInnerSVGFrame_id,
    nsSVGLeafFrame_id,
    nsSVGLinearGradientFrame_id,
    nsSVGMarkerFrame_id,
    nsSVGMaskFrame_id,
    nsSVGOuterSVGFrame_id,
    nsSVGPaintServerFrame_id,
    nsSVGPathGeometryFrame_id,
    nsSVGPatternFrame_id,
    nsSVGRadialGradientFrame_id,
    nsSVGStopFrame_id,
    nsSVGSwitchFrame_id,
    nsSVGTextContainerFrame_id,
    nsSVGTextFrame_id,
    nsSVGTextPathFrame_id,
    nsSVGTSpanFrame_id,
    nsSVGUseFrame_id,
    nsTableCaptionFrame_id,
    nsTableCellFrame_id,
    nsTableColFrame_id,
    nsTableColGroupFrame_id,
    nsTableFrame_id,
    nsTableOuterFrame_id,
    nsTableRowFrame_id,
    nsTableRowGroupFrame_id,
    nsTextBoxFrame_id,
    nsTextControlFrame_id,
    nsTextFrame_id,
    nsTitleBarFrame_id,
    nsTreeBodyFrame_id,
    nsTreeColFrame_id,
    nsVideoFrame_id,
    nsXULLabelFrame_id,
    nsXULScrollFrame_id,
    ViewportFrame_id,

    // The PresArena implementation uses this bit to distinguish
    // objects allocated by size (that is, non-frames) from objects
    // allocated by code (that is, frames).  It should not collide
    // with any frame ID.  It is not 0x80000000 to avoid the question
    // of whether enumeration constants are signed.
    NON_FRAME_MARKER = 0x40000000
  };

  virtual void* QueryFrame(FrameIID id) = 0;
};

class do_QueryFrame
{
public:
  do_QueryFrame(nsQueryFrame *s) : mRawPtr(s) { }

  template<class Dest>
  operator Dest*() {
    if (!mRawPtr)
      return nsnull;

    return reinterpret_cast<Dest*>(mRawPtr->QueryFrame(Dest::kFrameIID));
  }

private:
  nsQueryFrame *mRawPtr;
};

#endif // nsQueryFrame_h