michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * a list of the recomputation that needs to be done in response to a
michael@0:  * style change
michael@0:  */
michael@0: 
michael@0: #include "nsStyleChangeList.h"
michael@0: #include "nsIContent.h"
michael@0: 
michael@0: static const uint32_t kGrowArrayBy = 10;
michael@0: 
michael@0: nsStyleChangeList::nsStyleChangeList()
michael@0:   : mArray(mBuffer),
michael@0:     mArraySize(kStyleChangeBufferSize),
michael@0:     mCount(0)
michael@0: {
michael@0:   MOZ_COUNT_CTOR(nsStyleChangeList);
michael@0: }
michael@0: 
michael@0: nsStyleChangeList::~nsStyleChangeList()
michael@0: {
michael@0:   MOZ_COUNT_DTOR(nsStyleChangeList);
michael@0:   Clear();
michael@0: }
michael@0: 
michael@0: nsresult 
michael@0: nsStyleChangeList::ChangeAt(int32_t aIndex, nsIFrame*& aFrame, nsIContent*& aContent, 
michael@0:                             nsChangeHint& aHint) const
michael@0: {
michael@0:   if ((0 <= aIndex) && (aIndex < mCount)) {
michael@0:     aFrame = mArray[aIndex].mFrame;
michael@0:     aContent = mArray[aIndex].mContent;
michael@0:     aHint = mArray[aIndex].mHint;
michael@0:     return NS_OK;
michael@0:   }
michael@0:   return NS_ERROR_ILLEGAL_VALUE;
michael@0: }
michael@0: 
michael@0: nsresult 
michael@0: nsStyleChangeList::ChangeAt(int32_t aIndex, const nsStyleChangeData** aChangeData) const
michael@0: {
michael@0:   if ((0 <= aIndex) && (aIndex < mCount)) {
michael@0:     *aChangeData = &mArray[aIndex];
michael@0:     return NS_OK;
michael@0:   }
michael@0:   return NS_ERROR_ILLEGAL_VALUE;
michael@0: }
michael@0: 
michael@0: nsresult 
michael@0: nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint)
michael@0: {
michael@0:   NS_ASSERTION(aFrame || (aHint & nsChangeHint_ReconstructFrame),
michael@0:                "must have frame");
michael@0:   NS_ASSERTION(aContent || !(aHint & nsChangeHint_ReconstructFrame),
michael@0:                "must have content");
michael@0:   // XXXbz we should make this take Element instead of nsIContent
michael@0:   NS_ASSERTION(!aContent || aContent->IsElement(),
michael@0:                "Shouldn't be trying to restyle non-elements directly");
michael@0:   NS_ASSERTION(!(aHint & nsChangeHint_AllReflowHints) ||
michael@0:                (aHint & nsChangeHint_NeedReflow),
michael@0:                "Reflow hint bits set without actually asking for a reflow");
michael@0: 
michael@0:   if ((0 < mCount) && (aHint & nsChangeHint_ReconstructFrame)) { // filter out all other changes for same content
michael@0:     if (aContent) {
michael@0:       for (int32_t index = mCount - 1; index >= 0; --index) {
michael@0:         if (aContent == mArray[index].mContent) { // remove this change
michael@0:           aContent->Release();
michael@0:           mCount--;
michael@0:           if (index < mCount) { // move later changes down
michael@0:             ::memmove(&mArray[index], &mArray[index + 1], 
michael@0:                       (mCount - index) * sizeof(nsStyleChangeData));
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   int32_t last = mCount - 1;
michael@0:   if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame
michael@0:     NS_UpdateHint(mArray[last].mHint, aHint);
michael@0:   }
michael@0:   else {
michael@0:     if (mCount == mArraySize) {
michael@0:       int32_t newSize = mArraySize + kGrowArrayBy;
michael@0:       nsStyleChangeData* newArray = new nsStyleChangeData[newSize];
michael@0:       if (newArray) {
michael@0:         memcpy(newArray, mArray, mCount * sizeof(nsStyleChangeData));
michael@0:         if (mArray != mBuffer) {
michael@0:           delete [] mArray;
michael@0:         }
michael@0:         mArray = newArray;
michael@0:         mArraySize = newSize;
michael@0:       }
michael@0:       else {
michael@0:         return NS_ERROR_OUT_OF_MEMORY;
michael@0:       }
michael@0:     }
michael@0:     mArray[mCount].mFrame = aFrame;
michael@0:     mArray[mCount].mContent = aContent;
michael@0:     if (aContent) {
michael@0:       aContent->AddRef();
michael@0:     }
michael@0:     mArray[mCount].mHint = aHint;
michael@0:     mCount++;
michael@0:   }
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsStyleChangeList::Clear()
michael@0: {
michael@0:   for (int32_t index = mCount - 1; index >= 0; --index) {
michael@0:     nsIContent* content = mArray[index].mContent;
michael@0:     if (content) {
michael@0:       content->Release();
michael@0:     }
michael@0:   }
michael@0:   if (mArray != mBuffer) {
michael@0:     delete [] mArray;
michael@0:     mArray = mBuffer;
michael@0:     mArraySize = kStyleChangeBufferSize;
michael@0:   }
michael@0:   mCount = 0;
michael@0: }
michael@0: