gecko/content/smil/nsSMILTimeContainer.cpp

178 lines
4.8 KiB
C++

/* -*- 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 the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.com>
*
* 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 "nsSMILTimeContainer.h"
nsSMILTimeContainer::nsSMILTimeContainer()
:
mParent(nsnull),
mCurrentTime(0L),
mParentOffset(0L),
mPauseStart(0L),
mNeedsPauseSample(PR_FALSE),
mPauseState(PAUSE_BEGIN)
{
}
nsSMILTimeContainer::~nsSMILTimeContainer()
{
if (mParent) {
mParent->RemoveChild(*this);
}
}
void
nsSMILTimeContainer::Begin()
{
Resume(PAUSE_BEGIN);
if (mPauseState) {
mNeedsPauseSample = PR_TRUE;
}
// This is a little bit complicated here. Ideally we'd just like to call
// Sample() and force an initial sample but this turns out to be a bad idea
// because this may mean that NeedsSample() no longer reports true and so when
// we come to the first real sample our parent will skip us over altogether.
// So we force the time to be updated and adopt the policy to never call
// Sample() ourselves but to always leave that to our parent or client.
UpdateCurrentTime();
}
void
nsSMILTimeContainer::Pause(PRUint32 aType)
{
if (!mPauseState && aType) {
mPauseStart = GetParentTime();
mNeedsPauseSample = PR_TRUE;
}
mPauseState |= aType;
}
void
nsSMILTimeContainer::Resume(PRUint32 aType)
{
if (!mPauseState)
return;
mPauseState &= ~aType;
if (!mPauseState) {
nsSMILTime extraOffset = GetParentTime() - mPauseStart;
mParentOffset += extraOffset;
}
}
nsSMILTime
nsSMILTimeContainer::GetCurrentTime() const
{
// The following behaviour is consistent with:
// http://www.w3.org/2003/01/REC-SVG11-20030114-errata
// #getCurrentTime_setCurrentTime_undefined_before_document_timeline_begin
// which says that if GetCurrentTime is called before the document timeline
// has begun we should just return 0.
if (IsPausedByType(PAUSE_BEGIN))
return 0L;
return mCurrentTime;
}
void
nsSMILTimeContainer::SetCurrentTime(nsSMILTime aSeekTo)
{
// The following behaviour is consistent with:
// http://www.w3.org/2003/01/REC-SVG11-20030114-errata
// #getCurrentTime_setCurrentTime_undefined_before_document_timeline_begin
// which says that if SetCurrentTime is called before the document timeline
// has begun we should still adjust the offset.
mParentOffset = GetParentTime() - aSeekTo;
if (mPauseState) {
mNeedsPauseSample = PR_TRUE;
}
// Force an update to the current time in case we get a call to GetCurrentTime
// before another call to Sample().
UpdateCurrentTime();
}
nsSMILTime
nsSMILTimeContainer::GetParentTime() const
{
if (mParent)
return mParent->GetCurrentTime();
return 0L;
}
void
nsSMILTimeContainer::Sample()
{
if (!NeedsSample())
return;
UpdateCurrentTime();
DoSample();
mNeedsPauseSample = PR_FALSE;
}
nsresult
nsSMILTimeContainer::SetParent(nsSMILTimeContainer* aParent)
{
if (mParent) {
mParent->RemoveChild(*this);
}
mParent = aParent;
nsresult rv = NS_OK;
if (mParent) {
rv = mParent->AddChild(*this);
}
return rv;
}
void
nsSMILTimeContainer::UpdateCurrentTime()
{
nsSMILTime now = mPauseState ? mPauseStart : GetParentTime();
mCurrentTime = now - mParentOffset;
}