/* -*- 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):
 *   Original Author: David W. Hyatt (hyatt@netscape.com)
 *   Pierre Phaneuf <pp@ludusdesign.com>
 *   Dean Tessman <dean_tessman@hotmail.com>
 *   Mats Palmgren <mats.palmgren@bredband.net>
 *
 * 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 ***** */

#include "nsPopupSetFrame.h"
#include "nsGkAtoms.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsBoxLayoutState.h"
#include "nsIScrollableFrame.h"
#include "nsIRootBox.h"

nsPopupFrameList::nsPopupFrameList(nsIContent* aPopupContent, nsPopupFrameList* aNext)
:mNextPopup(aNext), 
 mPopupFrame(nsnull),
 mPopupContent(aPopupContent)
{
}

//
// NS_NewPopupSetFrame
//
// Wrapper for creating a new menu popup container
//
nsIFrame*
NS_NewPopupSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsPopupSetFrame (aPresShell, aContext);
}

NS_IMETHODIMP
nsPopupSetFrame::Init(nsIContent*      aContent,
                      nsIFrame*        aParent,
                      nsIFrame*        aPrevInFlow)
{
  nsresult  rv = nsBoxFrame::Init(aContent, aParent, aPrevInFlow);

  // Normally the root box is our grandparent, but in case of wrapping
  // it can be our great-grandparent.
  nsIRootBox *rootBox = nsIRootBox::GetRootBox(PresContext()->GetPresShell());
  if (rootBox) {
    rootBox->SetPopupSetFrame(this);
  }

  return rv;
}

nsIAtom*
nsPopupSetFrame::GetType() const
{
  return nsGkAtoms::popupSetFrame;
}

NS_IMETHODIMP
nsPopupSetFrame::AppendFrames(nsIAtom*        aListName,
                              nsIFrame*       aFrameList)
{
  if (aListName == nsGkAtoms::popupList) {
    return AddPopupFrameList(aFrameList);
  }
  return nsBoxFrame::AppendFrames(aListName, aFrameList);
}

NS_IMETHODIMP
nsPopupSetFrame::RemoveFrame(nsIAtom*        aListName,
                             nsIFrame*       aOldFrame)
{
  if (aListName == nsGkAtoms::popupList) {
    return RemovePopupFrame(aOldFrame);
  }
  return nsBoxFrame::RemoveFrame(aListName, aOldFrame);
}

NS_IMETHODIMP
nsPopupSetFrame::InsertFrames(nsIAtom*        aListName,
                              nsIFrame*       aPrevFrame,
                              nsIFrame*       aFrameList)
{
  if (aListName == nsGkAtoms::popupList) {
    return AddPopupFrameList(aFrameList);
  }
  return nsBoxFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
}

NS_IMETHODIMP
nsPopupSetFrame::SetInitialChildList(nsIAtom*        aListName,
                                     nsIFrame*       aChildList)
{
  if (aListName == nsGkAtoms::popupList) {
    return AddPopupFrameList(aChildList);
  }
  return nsBoxFrame::SetInitialChildList(aListName, aChildList);
}

void
nsPopupSetFrame::Destroy()
{
  // remove each popup from the list as we go.
  while (mPopupList) {
    if (mPopupList->mPopupFrame) {
      mPopupList->mPopupFrame->Destroy();
    }
    nsPopupFrameList* temp = mPopupList;
    mPopupList = mPopupList->mNextPopup;
    delete temp;
  }

  // Normally the root box is our grandparent, but in case of wrapping
  // it can be our great-grandparent.
  nsIRootBox *rootBox = nsIRootBox::GetRootBox(PresContext()->GetPresShell());
  if (rootBox) {
    rootBox->SetPopupSetFrame(nsnull);
  }

  nsBoxFrame::Destroy();
}

NS_IMETHODIMP
nsPopupSetFrame::DoLayout(nsBoxLayoutState& aState)
{
  // lay us out
  nsresult rv = nsBoxFrame::DoLayout(aState);

  // lay out all of our currently open popups.
  nsPopupFrameList* currEntry = mPopupList;
  while (currEntry) {
    nsMenuPopupFrame* popupChild = currEntry->mPopupFrame;
    if (popupChild && popupChild->IsOpen()) {
      // then get its preferred size
      nsSize prefSize = popupChild->GetPrefSize(aState);
      nsSize minSize = popupChild->GetMinSize(aState);
      nsSize maxSize = popupChild->GetMaxSize(aState);

      prefSize = BoundsCheck(minSize, prefSize, maxSize);

      popupChild->SetPreferredBounds(aState, nsRect(0,0,prefSize.width, prefSize.height));
      popupChild->SetPopupPosition(nsnull);

      // is the new size too small? Make sure we handle scrollbars correctly
      nsIBox* child = popupChild->GetChildBox();

      nsRect bounds(popupChild->GetRect());

      nsIScrollableFrame *scrollframe = do_QueryFrame(child);
      if (scrollframe &&
          scrollframe->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_AUTO) {
        // if our pref height
        if (bounds.height < prefSize.height) {
          // layout the child
          popupChild->Layout(aState);

          nsMargin scrollbars = scrollframe->GetActualScrollbarSizes();
          if (bounds.width < prefSize.width + scrollbars.left + scrollbars.right)
          {
            bounds.width += scrollbars.left + scrollbars.right;
            popupChild->SetBounds(aState, bounds);
          }
        }
      }

      // layout the child
      popupChild->Layout(aState);
      // if the width or height changed, readjust the popup position. This is a
      // special case for tooltips where the preferred height doesn't include the
      // real height for its inline element, but does once it is laid out.
      // This is bug 228673 which doesn't have a simple fix.
      if (popupChild->GetRect().width > bounds.width ||
          popupChild->GetRect().height > bounds.height) {
        // the size after layout was larger than the preferred size,
        // so set the preferred size accordingly
        popupChild->SetPreferredSize(popupChild->GetSize());
        popupChild->SetPopupPosition(nsnull);
      }
      popupChild->AdjustView();
    }

    currEntry = currEntry->mNextPopup;
  }

  return rv;
}

nsresult
nsPopupSetFrame::RemovePopupFrame(nsIFrame* aPopup)
{
  // This was called by the Destroy() method of the popup, so all we have to do is
  // get the popup out of our list, so we don't reflow it later.
#ifdef DEBUG
  PRBool found = PR_FALSE;
#endif
  nsPopupFrameList* currEntry = mPopupList;
  nsPopupFrameList* temp = nsnull;
  while (currEntry) {
    if (currEntry->mPopupFrame == aPopup) {
      // Remove this entry.
      if (temp)
        temp->mNextPopup = currEntry->mNextPopup;
      else
        mPopupList = currEntry->mNextPopup;
      
      NS_ASSERTION((aPopup->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
                   aPopup->GetType() == nsGkAtoms::menuPopupFrame,
                   "found wrong type of frame in popupset's ::popupList");
      // Destroy the frame.
      currEntry->mPopupFrame->Destroy();

      // Delete the entry.
      currEntry->mNextPopup = nsnull;
      delete currEntry;
#ifdef DEBUG
      found = PR_TRUE;
#endif

      // Break out of the loop.
      break;
    }

    temp = currEntry;
    currEntry = currEntry->mNextPopup;
  }

  NS_ASSERTION(found, "frame to remove is not in our ::popupList");
  return NS_OK;
}

nsresult
nsPopupSetFrame::AddPopupFrameList(nsIFrame* aPopupFrameList)
{
  for (nsIFrame* kid = aPopupFrameList; kid; kid = kid->GetNextSibling()) {
    nsresult rv = AddPopupFrame(kid);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  return NS_OK;
}

nsresult
nsPopupSetFrame::AddPopupFrame(nsIFrame* aPopup)
{
  NS_ASSERTION((aPopup->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
               aPopup->GetType() == nsGkAtoms::menuPopupFrame,
               "adding wrong type of frame in popupset's ::popupList");

  // The entry should already exist, but might not (if someone decided to make their
  // popup visible straightaway, e.g., the autocomplete widget).
  // First look for an entry by content.
  nsIContent* content = aPopup->GetContent();
  nsPopupFrameList* entry = mPopupList;
  while (entry && entry->mPopupContent != content)
    entry = entry->mNextPopup;
  if (!entry) {
    entry = new nsPopupFrameList(content, mPopupList);
    if (!entry)
      return NS_ERROR_OUT_OF_MEMORY;
    mPopupList = entry;
  }
  else {
    NS_ASSERTION(!entry->mPopupFrame, "Leaking a popup frame");
  }

  // Set the frame connection.
  entry->mPopupFrame = static_cast<nsMenuPopupFrame *>(aPopup);
  
  return NS_OK;
}

#ifdef DEBUG
NS_IMETHODIMP
nsPopupSetFrame::List(FILE* out, PRInt32 aIndent) const
{
  IndentBy(out, aIndent);
  ListTag(out);
#ifdef DEBUG_waterson
  fprintf(out, " [parent=%p]", static_cast<void*>(mParent));
#endif
  if (HasView()) {
    fprintf(out, " [view=%p]", static_cast<void*>(GetView()));
  }
  if (nsnull != mNextSibling) {
    fprintf(out, " next=%p", static_cast<void*>(mNextSibling));
  }
  if (nsnull != GetPrevContinuation()) {
    fprintf(out, " prev-continuation=%p", static_cast<void*>(GetPrevContinuation()));
  }
  if (nsnull != GetNextContinuation()) {
    fprintf(out, " next-continuation=%p", static_cast<void*>(GetNextContinuation()));
  }
  fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
  if (0 != mState) {
    fprintf(out, " [state=%08x]", mState);
  }
  fprintf(out, " [content=%p]", static_cast<void*>(mContent));
  nsPopupSetFrame* f = const_cast<nsPopupSetFrame*>(this);
  if (f->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) {
    nsRect overflowArea = f->GetOverflowRect();
    fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea.x, overflowArea.y,
            overflowArea.width, overflowArea.height);
  }
  fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
  nsIAtom* pseudoTag = mStyleContext->GetPseudoType();
  if (pseudoTag) {
    nsAutoString atomString;
    pseudoTag->ToString(atomString);
    fprintf(out, " pst=%s",
            NS_LossyConvertUTF16toASCII(atomString).get());
  }

  // Output the children
  nsIAtom* listName = nsnull;
  PRInt32 listIndex = 0;
  PRBool outputOneList = PR_FALSE;
  do {
    nsIFrame* kid = GetFirstChild(listName);
    if (nsnull != kid) {
      if (outputOneList) {
        IndentBy(out, aIndent);
      }
      outputOneList = PR_TRUE;
      nsAutoString tmp;
      if (nsnull != listName) {
        listName->ToString(tmp);
        fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
      }
      fputs("<\n", out);
      while (nsnull != kid) {
        // Verify the child frame's parent frame pointer is correct
        NS_ASSERTION(kid->GetParent() == (nsIFrame*)this, "bad parent frame pointer");

        // Have the child frame list
        nsIFrameDebug*  frameDebug = do_QueryFrame(kid);
        if (frameDebug) {
          frameDebug->List(out, aIndent + 1);
        }
        kid = kid->GetNextSibling();
      }
      IndentBy(out, aIndent);
      fputs(">\n", out);
    }
    listName = GetAdditionalChildListName(listIndex++);
  } while(nsnull != listName);

  // XXXmats the above is copy-pasted from nsContainerFrame::List which is lame,
  // clean this up after bug 399111 is implemented.

  if (mPopupList) {
    fputs("<\n", out);
    ++aIndent;
    IndentBy(out, aIndent);
    nsAutoString tmp;
    nsGkAtoms::popupList->ToString(tmp);
    fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
    fputs(" for ", out);
    ListTag(out);
    fputs(" <\n", out);
    ++aIndent;
    for (nsPopupFrameList* l = mPopupList; l; l = l->mNextPopup) {
      nsIFrameDebug* frameDebug = do_QueryFrame(l->mPopupFrame);
      if (frameDebug) {
        frameDebug->List(out, aIndent);
      }
    }
    --aIndent;
    IndentBy(out, aIndent);
    fputs(">\n", out);
    --aIndent;
    IndentBy(out, aIndent);
    fputs(">\n", out);
    outputOneList = PR_TRUE;
  }

  if (!outputOneList) {
    fputs("<>\n", out);
  }

  return NS_OK;
}
#endif