gecko/layout/base/FramePropertyTable.cpp

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/* -*- Mode: C++; tab-width: 20; 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 Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
*
* 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 ***** */
#include "FramePropertyTable.h"
#include "prlog.h"
namespace mozilla {
void
FramePropertyTable::Set(nsIFrame* aFrame, const FramePropertyDescriptor* aProperty,
void* aValue)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
if (mLastFrame != aFrame || !mLastEntry) {
mLastFrame = aFrame;
mLastEntry = mEntries.PutEntry(aFrame);
}
Entry* entry = mLastEntry;
if (!entry->mProp.IsArray()) {
if (!entry->mProp.mProperty) {
// Empty entry, so we can just store our property in the empty slot
entry->mProp.mProperty = aProperty;
entry->mProp.mValue = aValue;
return;
}
if (entry->mProp.mProperty == aProperty) {
// Just overwrite the current value
entry->mProp.DestroyValueFor(aFrame);
entry->mProp.mValue = aValue;
return;
}
// We need to expand the single current entry to an array
PropertyValue current = entry->mProp;
entry->mProp.mProperty = nsnull;
PR_STATIC_ASSERT(sizeof(nsTArray<PropertyValue>) <= sizeof(void *));
new (&entry->mProp.mValue) nsTArray<PropertyValue>(4);
entry->mProp.ToArray()->AppendElement(current);
}
nsTArray<PropertyValue>* array = entry->mProp.ToArray();
nsTArray<PropertyValue>::index_type index =
array->IndexOf(aProperty, 0, PropertyComparator());
if (index != nsTArray<PropertyValue>::NoIndex) {
PropertyValue* pv = &array->ElementAt(index);
pv->DestroyValueFor(aFrame);
pv->mValue = aValue;
return;
}
array->AppendElement(PropertyValue(aProperty, aValue));
}
void*
FramePropertyTable::Get(const nsIFrame* aFrame,
const FramePropertyDescriptor* aProperty,
PRBool* aFoundResult)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
if (aFoundResult) {
*aFoundResult = PR_FALSE;
}
if (mLastFrame != aFrame) {
mLastFrame = const_cast<nsIFrame*>(aFrame);
mLastEntry = mEntries.GetEntry(mLastFrame);
}
Entry* entry = mLastEntry;
if (!entry)
return nsnull;
if (entry->mProp.mProperty == aProperty) {
if (aFoundResult) {
*aFoundResult = PR_TRUE;
}
return entry->mProp.mValue;
}
if (!entry->mProp.IsArray()) {
// There's just one property and it's not the one we want, bail
return nsnull;
}
nsTArray<PropertyValue>* array = entry->mProp.ToArray();
nsTArray<PropertyValue>::index_type index =
array->IndexOf(aProperty, 0, PropertyComparator());
if (index == nsTArray<PropertyValue>::NoIndex)
return nsnull;
if (aFoundResult) {
*aFoundResult = PR_TRUE;
}
return array->ElementAt(index).mValue;
}
void*
FramePropertyTable::Remove(nsIFrame* aFrame, const FramePropertyDescriptor* aProperty,
PRBool* aFoundResult)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
if (aFoundResult) {
*aFoundResult = PR_FALSE;
}
if (mLastFrame != aFrame) {
mLastFrame = aFrame;
mLastEntry = mEntries.GetEntry(aFrame);
}
Entry* entry = mLastEntry;
if (!entry)
return nsnull;
if (entry->mProp.mProperty == aProperty) {
// There's only one entry and it's the one we want
void* value = entry->mProp.mValue;
mEntries.RawRemoveEntry(entry);
mLastEntry = nsnull;
if (aFoundResult) {
*aFoundResult = PR_TRUE;
}
return value;
}
if (!entry->mProp.IsArray()) {
// There's just one property and it's not the one we want, bail
return nsnull;
}
nsTArray<PropertyValue>* array = entry->mProp.ToArray();
nsTArray<PropertyValue>::index_type index =
array->IndexOf(aProperty, 0, PropertyComparator());
if (index == nsTArray<PropertyValue>::NoIndex) {
// No such property, bail
return nsnull;
}
if (aFoundResult) {
*aFoundResult = PR_TRUE;
}
void* result = array->ElementAt(index).mValue;
PRUint32 last = array->Length() - 1;
array->ElementAt(index) = array->ElementAt(last);
array->RemoveElementAt(last);
if (last == 1) {
PropertyValue pv = array->ElementAt(0);
array->nsTArray<PropertyValue>::~nsTArray<PropertyValue>();
entry->mProp = pv;
}
return result;
}
void
FramePropertyTable::Delete(nsIFrame* aFrame, const FramePropertyDescriptor* aProperty)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
PRBool found;
void* v = Remove(aFrame, aProperty, &found);
if (found) {
PropertyValue pv(aProperty, v);
pv.DestroyValueFor(aFrame);
}
}
/* static */ void
FramePropertyTable::DeleteAllForEntry(Entry* aEntry)
{
if (!aEntry->mProp.IsArray()) {
aEntry->mProp.DestroyValueFor(aEntry->GetKey());
return;
}
nsTArray<PropertyValue>* array = aEntry->mProp.ToArray();
for (PRUint32 i = 0; i < array->Length(); ++i) {
array->ElementAt(i).DestroyValueFor(aEntry->GetKey());
}
array->nsTArray<PropertyValue>::~nsTArray<PropertyValue>();
}
void
FramePropertyTable::DeleteAllFor(nsIFrame* aFrame)
{
NS_ASSERTION(aFrame, "Null frame?");
Entry* entry = mEntries.GetEntry(aFrame);
if (!entry)
return;
if (mLastFrame == aFrame) {
// Flush cache. We assume DeleteAllForEntry will be called before
// a frame is destroyed.
mLastFrame = nsnull;
mLastEntry = nsnull;
}
DeleteAllForEntry(entry);
mEntries.RawRemoveEntry(entry);
}
/* static */ PLDHashOperator
FramePropertyTable::DeleteEnumerator(Entry* aEntry, void* aArg)
{
DeleteAllForEntry(aEntry);
return PL_DHASH_REMOVE;
}
void
FramePropertyTable::DeleteAll()
{
mLastFrame = nsnull;
mLastEntry = nsnull;
mEntries.EnumerateEntries(DeleteEnumerator, nsnull);
}
}