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/* -*- 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 ***** */
#ifndef nsContainerFrame_h___
#define nsContainerFrame_h___

#include "nsSplittableFrame.h"
#include "nsFrameList.h"

// Option flags for ReflowChild() and FinishReflowChild()
// member functions
#define NS_FRAME_NO_MOVE_VIEW         0x0001
#define NS_FRAME_NO_MOVE_FRAME        (0x0002 | NS_FRAME_NO_MOVE_VIEW)
#define NS_FRAME_NO_SIZE_VIEW         0x0004
#define NS_FRAME_NO_VISIBILITY        0x0008

/**
 * Implementation of a container frame.
 */
class nsContainerFrame : public nsSplittableFrame
{
public:
  // nsIFrame overrides
  NS_IMETHOD Init(nsPresContext*  aPresContext,
                  nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsStyleContext*  aContext,
                  nsIFrame*        aPrevInFlow);
  NS_IMETHOD SetInitialChildList(nsPresContext* aPresContext,
                                 nsIAtom*        aListName,
                                 nsIFrame*       aChildList);
  virtual nsIFrame* GetFirstChild(nsIAtom* aListName) const;
  virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
  NS_IMETHOD Destroy(nsPresContext* aPresContext);
  NS_IMETHOD Paint(nsPresContext*      aPresContext,
                   nsIRenderingContext& aRenderingContext,
                   const nsRect&        aDirtyRect,
                   nsFramePaintLayer    aWhichLayer,
                   PRUint32             aFlags = 0);
  NS_IMETHOD GetFrameForPoint(const nsPoint& aPoint, 
                              nsFramePaintLayer aWhichLayer,
                              nsIFrame**     aFrame);
  NS_IMETHOD ReplaceFrame(nsIAtom*        aListName,
                          nsIFrame*       aOldFrame,
                          nsIFrame*       aNewFrame);
  NS_IMETHOD ReflowDirtyChild(nsIPresShell* aPresShell, nsIFrame* aChild);

  virtual PRBool IsLeaf() const;
  
#ifdef DEBUG
  NS_IMETHOD List(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent) const;
#endif  

  // nsContainerFrame methods
  virtual void DeleteNextInFlowChild(nsPresContext* aPresContext,
                                     nsIFrame*       aNextInFlow);

  static PRInt32 LengthOf(nsIFrame* aFrameList) {
    nsFrameList tmp(aFrameList);
    return tmp.GetLength();
  }

  // Positions the frame's view based on the frame's origin
  static void PositionFrameView(nsIFrame* aKidFrame);

  // Set the view's size and position after its frame has been reflowed.
  //
  // Flags:
  // NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
  //    don't want to automatically sync the frame and view
  // NS_FRAME_NO_SIZE_VIEW - don't size the view
  static void SyncFrameViewAfterReflow(nsPresContext* aPresContext,
                                       nsIFrame*       aFrame,
                                       nsIView*        aView,
                                       const nsRect*   aCombinedArea,
                                       PRUint32        aFlags = 0);
  
  // Sets view attributes from the frame style that depend on the view's size
  // (clip, transparency). This needs to be called if you change the size of
  // a view and the view's frame could have clipping set on it.
  // @param aStyleContext can be null, in which case the frame's style context is used
  static void SyncFrameViewAfterSizeChange(nsPresContext*  aPresContext,
                                           nsIFrame*        aFrame,
                                           nsStyleContext*  aStyleContext,
                                           nsIView*         aView,
                                           PRUint32         aFlags = 0);
  
  // Sets the view's attributes from the frame style.
  // - opacity
  // - visibility
  // - content transparency
  // - clip
  // Call this when one of these styles changes or when the view has just
  // been created.
  // @param aStyleContext can be null, in which case the frame's style context is used
  static void SyncFrameViewProperties(nsPresContext*  aPresContext,
                                      nsIFrame*        aFrame,
                                      nsStyleContext*  aStyleContext,
                                      nsIView*         aView,
                                      PRUint32         aFlags = 0);

  // Returns PR_TRUE if the frame requires a view
  static PRBool FrameNeedsView(nsIFrame* aFrame);
  
  /**
   * Invokes the WillReflow() function, positions the frame and its view (if
   * requested), and then calls Reflow(). If the reflow succeeds and the child
   * frame is complete, deletes any next-in-flows using DeleteNextInFlowChild()
   *
   * Flags:
   * NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
   *    don't want to automatically sync the frame and view
   * NS_FRAME_NO_MOVE_VIEW - don't move the frame. aX and aY are ignored in this
   *    case. Also implies NS_FRAME_NO_MOVE_VIEW
   */
  nsresult ReflowChild(nsIFrame*                aKidFrame,
                       nsPresContext*          aPresContext,
                       nsHTMLReflowMetrics&     aDesiredSize,
                       const nsHTMLReflowState& aReflowState,
                       nscoord                  aX,
                       nscoord                  aY,
                       PRUint32                 aFlags,
                       nsReflowStatus&          aStatus);

  /**
   * The second half of frame reflow. Does the following:
   * - sets the frame's bounds
   * - sizes and positions (if requested) the frame's view. If the frame's final
   *   position differs from the current position and the frame itself does not
   *   have a view, then any child frames with views are positioned so they stay
   *   in sync
   * - sets the view's visibility, opacity, content transparency, and clip
   * - invoked the DidReflow() function
   *
   * Flags:
   * NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
   *    case. Also implies NS_FRAME_NO_MOVE_VIEW
   * NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
   *    don't want to automatically sync the frame and view
   * NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
   */
  static nsresult FinishReflowChild(nsIFrame*                 aKidFrame,
                                    nsPresContext*           aPresContext,
                                    const nsHTMLReflowState*  aReflowState,
                                    nsHTMLReflowMetrics&      aDesiredSize,
                                    nscoord                   aX,
                                    nscoord                   aY,
                                    PRUint32                  aFlags);

  
  static void PositionChildViews(nsIFrame* aFrame);

protected:
  nsContainerFrame();
  ~nsContainerFrame();

  nsresult GetFrameForPointUsing(const nsPoint& aPoint,
                                 nsIAtom*       aList,
                                 nsFramePaintLayer aWhichLayer,
                                 PRBool         aConsiderSelf,
                                 nsIFrame**     aFrame);

  virtual void PaintChildren(nsPresContext*      aPresContext,
                             nsIRenderingContext& aRenderingContext,
                             const nsRect&        aDirtyRect,
                             nsFramePaintLayer    aWhichLayer,
                             PRUint32             aFlags = 0);

  virtual void PaintChild(nsPresContext*      aPresContext,
                          nsIRenderingContext& aRenderingContext,
                          const nsRect&        aDirtyRect,
                          nsIFrame*            aFrame,
                          nsFramePaintLayer    aWhichLayer,
                          PRUint32             aFlags = 0);

  /**
   * Get the frames on the overflow list
   */
  nsIFrame* GetOverflowFrames(nsPresContext* aPresContext,
                              PRBool          aRemoveProperty) const;

  /**
   * Set the overflow list
   */
  nsresult SetOverflowFrames(nsPresContext* aPresContext,
                             nsIFrame*       aOverflowFrames);

  /**
   * Moves any frames on both the prev-in-flow's overflow list and the
   * receiver's overflow to the receiver's child list.
   *
   * Resets the overlist pointers to nsnull, and updates the receiver's child
   * count and content mapping.
   *
   * @return PR_TRUE if any frames were moved and PR_FALSE otherwise
   */
  PRBool MoveOverflowToChildList(nsPresContext* aPresContext);

  /**
   * Push aFromChild and its next siblings to the next-in-flow. Change
   * the geometric parent of each frame that's pushed. If there is no
   * next-in-flow the frames are placed on the overflow list (and the
   * geometric parent is left unchanged).
   *
   * Updates the next-in-flow's child count. Does <b>not</b> update the
   * pusher's child count.
   *
   * @param   aFromChild the first child frame to push. It is disconnected from
   *            aPrevSibling
   * @param   aPrevSibling aFromChild's previous sibling. Must not be null.
   *            It's an error to push a parent's first child frame
   */
  void PushChildren(nsPresContext* aPresContext,
                    nsIFrame*       aFromChild,
                    nsIFrame*       aPrevSibling);

  nsFrameList mFrames;
};

#endif /* nsContainerFrame_h___ */