mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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283 lines
8.2 KiB
C++
283 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsRefreshDriver.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Code to notify things that animate before a refresh, at an appropriate
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* refresh rate. (Perhaps temporary, until replaced by compositor.)
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*/
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#include "nsRefreshDriver.h"
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#include "nsPresContext.h"
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#include "nsComponentManagerUtils.h"
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#include "prlog.h"
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#include "nsAutoPtr.h"
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#include "nsCSSFrameConstructor.h"
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/*
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* TODO:
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* Once this is hooked in to suppressing updates when the presentation
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* is not visible, we need to hook it up to FlushPendingNotifications so
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* that we flush when necessary.
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*/
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#define REFRESH_INTERVAL_MILLISECONDS 20
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using mozilla::TimeStamp;
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nsRefreshDriver::nsRefreshDriver(nsPresContext *aPresContext)
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: mPresContext(aPresContext),
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mFrozen(PR_FALSE)
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{
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}
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nsRefreshDriver::~nsRefreshDriver()
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{
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NS_ABORT_IF_FALSE(ObserverCount() == 0,
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"observers should have unregistered");
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NS_ABORT_IF_FALSE(!mTimer, "timer should be gone");
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}
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TimeStamp
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nsRefreshDriver::MostRecentRefresh() const
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{
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const_cast<nsRefreshDriver*>(this)->EnsureTimerStarted();
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return mMostRecentRefresh;
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}
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PRBool
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nsRefreshDriver::AddRefreshObserver(nsARefreshObserver *aObserver,
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mozFlushType aFlushType)
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{
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ObserverArray& array = ArrayFor(aFlushType);
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PRBool success = array.AppendElement(aObserver) != nsnull;
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EnsureTimerStarted();
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return success;
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}
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PRBool
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nsRefreshDriver::RemoveRefreshObserver(nsARefreshObserver *aObserver,
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mozFlushType aFlushType)
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{
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ObserverArray& array = ArrayFor(aFlushType);
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return array.RemoveElement(aObserver);
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}
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void
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nsRefreshDriver::EnsureTimerStarted()
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{
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if (mTimer || mFrozen || !mPresContext) {
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// It's already been started, or we don't want to start it now or
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// we've been disconnected.
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return;
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}
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UpdateMostRecentRefresh();
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mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
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if (!mTimer) {
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return;
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}
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nsresult rv = mTimer->InitWithCallback(this, REFRESH_INTERVAL_MILLISECONDS,
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nsITimer::TYPE_REPEATING_SLACK);
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if (NS_FAILED(rv)) {
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mTimer = nsnull;
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}
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}
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void
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nsRefreshDriver::StopTimer()
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{
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if (!mTimer) {
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return;
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}
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mTimer->Cancel();
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mTimer = nsnull;
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}
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PRUint32
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nsRefreshDriver::ObserverCount() const
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{
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PRUint32 sum = 0;
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for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(mObservers); ++i) {
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sum += mObservers[i].Length();
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}
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sum += mStyleFlushObservers.Length();
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sum += mLayoutFlushObservers.Length();
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return sum;
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}
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void
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nsRefreshDriver::UpdateMostRecentRefresh()
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{
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mMostRecentRefresh = TimeStamp::Now();
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}
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nsRefreshDriver::ObserverArray&
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nsRefreshDriver::ArrayFor(mozFlushType aFlushType)
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{
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switch (aFlushType) {
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case Flush_Style:
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return mObservers[0];
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case Flush_Layout:
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return mObservers[1];
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case Flush_Display:
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return mObservers[2];
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default:
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NS_ABORT_IF_FALSE(PR_FALSE, "bad flush type");
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return *static_cast<ObserverArray*>(nsnull);
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}
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}
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/*
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* nsISupports implementation
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*/
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NS_IMPL_ISUPPORTS1(nsRefreshDriver, nsITimerCallback)
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/*
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* nsITimerCallback implementation
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*/
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NS_IMETHODIMP
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nsRefreshDriver::Notify(nsITimer * /* unused */)
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{
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NS_PRECONDITION(!mFrozen, "Why are we notified while frozen?");
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NS_PRECONDITION(mPresContext, "Why are we notified after disconnection?");
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UpdateMostRecentRefresh();
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nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
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if (!presShell || ObserverCount() == 0) {
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// Things are being destroyed, or we no longer have any observers.
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// We don't want to stop the timer when observers are initially
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// removed, because sometimes observers can be added and removed
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// often depending on what other things are going on and in that
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// situation we don't want to thrash our timer. So instead we
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// wait until we get a Notify() call when we have no observers
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// before stopping the timer.
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StopTimer();
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return NS_OK;
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}
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/*
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* The timer holds a reference to |this| while calling |Notify|.
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* However, implementations of |WillRefresh| are permitted to destroy
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* the pres context, which will cause our |mPresContext| to become
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* null. If this happens, we must stop notifying observers.
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*/
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for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(mObservers); ++i) {
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ObserverArray::EndLimitedIterator etor(mObservers[i]);
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while (etor.HasMore()) {
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nsRefPtr<nsARefreshObserver> obs = etor.GetNext();
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obs->WillRefresh(mMostRecentRefresh);
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if (!mPresContext || !mPresContext->GetPresShell()) {
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StopTimer();
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return NS_OK;
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}
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}
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if (i == 0) {
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// This is the Flush_Style case.
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while (!mStyleFlushObservers.IsEmpty() &&
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mPresContext && mPresContext->GetPresShell()) {
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PRUint32 idx = mStyleFlushObservers.Length() - 1;
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nsCOMPtr<nsIPresShell> shell = mStyleFlushObservers[idx];
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mStyleFlushObservers.RemoveElementAt(idx);
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shell->FrameConstructor()->mObservingRefreshDriver = PR_FALSE;
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shell->FlushPendingNotifications(Flush_Style);
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}
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} else if (i == 1) {
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// This is the Flush_Layout case.
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while (!mLayoutFlushObservers.IsEmpty() &&
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mPresContext && mPresContext->GetPresShell()) {
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PRUint32 idx = mLayoutFlushObservers.Length() - 1;
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nsCOMPtr<nsIPresShell> shell = mLayoutFlushObservers[idx];
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mLayoutFlushObservers.RemoveElementAt(idx);
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shell->mReflowScheduled = PR_FALSE;
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shell->mSuppressInterruptibleReflows = PR_FALSE;
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shell->FlushPendingNotifications(Flush_InterruptibleLayout);
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}
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}
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}
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return NS_OK;
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}
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void
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nsRefreshDriver::Freeze()
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{
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NS_ASSERTION(!mFrozen, "Freeze called on already-frozen refresh driver");
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StopTimer();
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mFrozen = PR_TRUE;
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}
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void
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nsRefreshDriver::Thaw()
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{
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NS_ASSERTION(mFrozen, "Thaw called on an unfrozen refresh driver");
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mFrozen = PR_FALSE;
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if (ObserverCount()) {
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NS_DispatchToCurrentThread(NS_NewRunnableMethod(this, &nsRefreshDriver::DoRefresh));
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EnsureTimerStarted();
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}
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}
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void
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nsRefreshDriver::DoRefresh()
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{
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// Don't do a refresh unless we're in a state where we should be refreshing.
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if (!mFrozen && mPresContext && mTimer) {
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Notify(nsnull);
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}
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}
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#ifdef DEBUG
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PRBool
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nsRefreshDriver::IsRefreshObserver(nsARefreshObserver *aObserver,
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mozFlushType aFlushType)
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{
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ObserverArray& array = ArrayFor(aFlushType);
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return array.Contains(aObserver);
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}
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#endif
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