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gecko/layout/base/nsPresContext.cpp

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/* -*- 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):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
* Ehsan Akhgari <ehsan.akhgari@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 ***** */
/* a presentation of a document, part 1 */
#include "nsCOMPtr.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsILinkHandler.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShell.h"
#include "nsIContentViewer.h"
#include "nsIDocumentViewer.h"
#include "nsPIDOMWindow.h"
#include "nsIFocusController.h"
#include "nsStyleSet.h"
#include "nsImageLoader.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsIRenderingContext.h"
#include "nsIURL.h"
#include "nsIDocument.h"
#include "nsStyleContext.h"
#include "nsILookAndFeel.h"
#include "nsWidgetsCID.h"
#include "nsIComponentManager.h"
#include "nsIURIContentListener.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIServiceManager.h"
#include "nsIDOMElement.h"
#include "nsContentPolicyUtils.h"
#include "nsIDOMWindow.h"
#include "nsXPIDLString.h"
#include "nsIWeakReferenceUtils.h"
#include "nsCSSRendering.h"
#include "prprf.h"
#include "nsContentPolicyUtils.h"
#include "nsIDOMDocument.h"
#include "nsAutoPtr.h"
#include "nsEventStateManager.h"
#include "nsThreadUtils.h"
#include "nsFrameManager.h"
#include "nsLayoutUtils.h"
#include "nsIViewManager.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSRuleProcessor.h"
#include "nsStyleChangeList.h"
#include "nsRuleNode.h"
#include "nsEventDispatcher.h"
#include "gfxUserFontSet.h"
#include "gfxPlatform.h"
#include "nsCSSRules.h"
#include "nsFontFaceLoader.h"
#include "nsIEventListenerManager.h"
#ifdef IBMBIDI
#include "nsBidiPresUtils.h"
#endif // IBMBIDI
#include "nsContentUtils.h"
// Needed for Start/Stop of Image Animation
#include "imgIContainer.h"
#include "nsIImageLoadingContent.h"
//needed for resetting of image service color
#include "nsLayoutCID.h"
static nscolor
MakeColorPref(const char *colstr)
{
PRUint32 red, green, blue;
nscolor colorref;
// 4.x stored RGB color values as a string rather than as an int,
// thus we need to do this conversion
PR_sscanf(colstr, "#%02x%02x%02x", &red, &green, &blue);
colorref = NS_RGB(red, green, blue);
return colorref;
}
int
nsPresContext::PrefChangedCallback(const char* aPrefName, void* instance_data)
{
nsPresContext* presContext = (nsPresContext*)instance_data;
NS_ASSERTION(nsnull != presContext, "bad instance data");
if (nsnull != presContext) {
presContext->PreferenceChanged(aPrefName);
}
return 0; // PREF_OK
}
void
nsPresContext::PrefChangedUpdateTimerCallback(nsITimer *aTimer, void *aClosure)
{
nsPresContext* presContext = (nsPresContext*)aClosure;
NS_ASSERTION(presContext != nsnull, "bad instance data");
if (presContext)
presContext->UpdateAfterPreferencesChanged();
}
#ifdef IBMBIDI
static PRBool
IsVisualCharset(const nsCString& aCharset)
{
if (aCharset.LowerCaseEqualsLiteral("ibm864") // Arabic//ahmed
|| aCharset.LowerCaseEqualsLiteral("ibm862") // Hebrew
|| aCharset.LowerCaseEqualsLiteral("iso-8859-8") ) { // Hebrew
return PR_TRUE; // visual text type
}
else {
return PR_FALSE; // logical text type
}
}
#endif // IBMBIDI
static PLDHashOperator
destroy_loads(const void * aKey, nsCOMPtr<nsImageLoader>& aData, void* closure)
{
aData->Destroy();
return PL_DHASH_NEXT;
}
static NS_DEFINE_CID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
#include "nsContentCID.h"
// NOTE! nsPresContext::operator new() zeroes out all members, so don't
// bother initializing members to 0.
nsPresContext::nsPresContext(nsIDocument* aDocument, nsPresContextType aType)
: mType(aType), mDocument(aDocument), mTextZoom(1.0), mFullZoom(1.0),
mPageSize(-1, -1), mPPScale(1.0f),
mViewportStyleOverflow(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO),
mImageAnimationModePref(imgIContainer::kNormalAnimMode),
// Font sizes default to zero; they will be set in GetFontPreferences
mDefaultVariableFont("serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, 0),
mDefaultFixedFont("monospace", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL, 0, 0),
mDefaultSerifFont("serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, 0),
mDefaultSansSerifFont("sans-serif", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL, 0, 0),
mDefaultMonospaceFont("monospace", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL, 0, 0),
mDefaultCursiveFont("cursive", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL, 0, 0),
mDefaultFantasyFont("fantasy", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL, 0, 0),
mCanPaginatedScroll(PR_FALSE),
mIsRootPaginatedDocument(PR_FALSE), mSupressResizeReflow(PR_FALSE)
{
// NOTE! nsPresContext::operator new() zeroes out all members, so don't
// bother initializing members to 0.
mDoScaledTwips = PR_TRUE;
SetBackgroundImageDraw(PR_TRUE); // always draw the background
SetBackgroundColorDraw(PR_TRUE);
mBackgroundColor = NS_RGB(0xFF, 0xFF, 0xFF);
mUseDocumentColors = PR_TRUE;
mUseDocumentFonts = PR_TRUE;
// the minimum font-size is unconstrained by default
mLinkColor = NS_RGB(0x00, 0x00, 0xEE);
mActiveLinkColor = NS_RGB(0xEE, 0x00, 0x00);
mVisitedLinkColor = NS_RGB(0x55, 0x1A, 0x8B);
mUnderlineLinks = PR_TRUE;
mFocusTextColor = mDefaultColor;
mFocusBackgroundColor = mBackgroundColor;
mFocusRingWidth = 1;
if (aType == eContext_Galley) {
mMedium = nsGkAtoms::screen;
} else {
SetBackgroundImageDraw(PR_FALSE);
SetBackgroundColorDraw(PR_FALSE);
mMedium = nsGkAtoms::print;
mPaginated = PR_TRUE;
}
if (!IsDynamic()) {
mImageAnimationMode = imgIContainer::kDontAnimMode;
mNeverAnimate = PR_TRUE;
} else {
mImageAnimationMode = imgIContainer::kNormalAnimMode;
mNeverAnimate = PR_FALSE;
}
NS_ASSERTION(mDocument, "Null document");
mUserFontSet = nsnull;
mUserFontSetDirty = PR_TRUE;
}
nsPresContext::~nsPresContext()
{
mImageLoaders.Enumerate(destroy_loads, nsnull);
mBorderImageLoaders.Enumerate(destroy_loads, nsnull);
NS_PRECONDITION(!mShell, "Presshell forgot to clear our mShell pointer");
SetShell(nsnull);
if (mEventManager) {
// unclear if these are needed, but can't hurt
mEventManager->NotifyDestroyPresContext(this);
mEventManager->SetPresContext(nsnull);
NS_RELEASE(mEventManager);
}
if (mPrefChangedTimer)
{
mPrefChangedTimer->Cancel();
mPrefChangedTimer = nsnull;
}
// Unregister preference callbacks
nsContentUtils::UnregisterPrefCallback("font.",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::UnregisterPrefCallback("browser.display.",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::UnregisterPrefCallback("browser.underline_anchors",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::UnregisterPrefCallback("browser.anchor_color",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::UnregisterPrefCallback("browser.active_color",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::UnregisterPrefCallback("browser.visited_color",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::UnregisterPrefCallback("image.animation_mode",
nsPresContext::PrefChangedCallback,
this);
#ifdef IBMBIDI
nsContentUtils::UnregisterPrefCallback("bidi.", PrefChangedCallback, this);
delete mBidiUtils;
#endif // IBMBIDI
nsContentUtils::UnregisterPrefCallback("layout.css.dpi",
nsPresContext::PrefChangedCallback,
this);
NS_IF_RELEASE(mDeviceContext);
NS_IF_RELEASE(mLookAndFeel);
NS_IF_RELEASE(mLangGroup);
NS_IF_RELEASE(mUserFontSet);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsPresContext)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPresContext)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPresContext)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsPresContext)
static PLDHashOperator
TraverseImageLoader(const void * aKey, nsCOMPtr<nsImageLoader>& aData,
void* aClosure)
{
nsCycleCollectionTraversalCallback *cb =
static_cast<nsCycleCollectionTraversalCallback*>(aClosure);
cb->NoteXPCOMChild(aData);
return PL_DHASH_NEXT;
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsPresContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mDocument);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mDeviceContext); // worth bothering?
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mEventManager);
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mLookAndFeel); // a service
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mLangGroup); // an atom
tmp->mImageLoaders.Enumerate(TraverseImageLoader, &cb);
tmp->mBorderImageLoaders.Enumerate(TraverseImageLoader, &cb);
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mTheme); // a service
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLangService); // a service
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mPrintSettings);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mPrefChangedTimer);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsPresContext)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mDocument);
NS_RELEASE(tmp->mDeviceContext); // worth bothering?
if (tmp->mEventManager) {
// unclear if these are needed, but can't hurt
tmp->mEventManager->NotifyDestroyPresContext(tmp);
tmp->mEventManager->SetPresContext(nsnull);
NS_RELEASE(tmp->mEventManager);
}
// NS_RELEASE(tmp->mLookAndFeel); // a service
// NS_RELEASE(tmp->mLangGroup); // an atom
tmp->mImageLoaders.Enumerate(destroy_loads, nsnull);
tmp->mImageLoaders.Clear();
tmp->mBorderImageLoaders.Enumerate(destroy_loads, nsnull);
tmp->mBorderImageLoaders.Clear();
// NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mTheme); // a service
// NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLangService); // a service
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mPrintSettings);
if (tmp->mPrefChangedTimer)
{
tmp->mPrefChangedTimer->Cancel();
tmp->mPrefChangedTimer = nsnull;
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
#define MAKE_FONT_PREF_KEY(_pref, _s0, _s1) \
_pref.Assign(_s0); \
_pref.Append(_s1);
static const char* const kGenericFont[] = {
".variable.",
".fixed.",
".serif.",
".sans-serif.",
".monospace.",
".cursive.",
".fantasy."
};
// Set to true when LookAndFeelChanged needs to be called. This is used
// because the look and feel is a service, so there's no need to notify it from
// more than one prescontext.
static PRBool sLookAndFeelChanged;
// Set to true when ThemeChanged needs to be called on mTheme. This is used
// because mTheme is a service, so there's no need to notify it from more than
// one prescontext.
static PRBool sThemeChanged;
void
nsPresContext::GetFontPreferences()
{
/* Fetch the font prefs to be used -- see bug 61883 for details.
Not all prefs are needed upfront. Some are fallback prefs intended
for the GFX font sub-system...
1) unit : assumed to be the same for all language groups -------------
font.size.unit = px | pt XXX could be folded in the size... bug 90440
2) attributes for generic fonts --------------------------------------
font.default = serif | sans-serif - fallback generic font
font.name.[generic].[langGroup] = current user' selected font on the pref dialog
font.name-list.[generic].[langGroup] = fontname1, fontname2, ... [factory pre-built list]
font.size.[generic].[langGroup] = integer - settable by the user
font.size-adjust.[generic].[langGroup] = "float" - settable by the user
font.minimum-size.[langGroup] = integer - settable by the user
*/
mDefaultVariableFont.size = CSSPixelsToAppUnits(16);
mDefaultFixedFont.size = CSSPixelsToAppUnits(13);
const char *langGroup = "x-western"; // Assume x-western is safe...
if (mLangGroup) {
mLangGroup->GetUTF8String(&langGroup);
}
nsCAutoString pref;
// get the current applicable font-size unit
enum {eUnit_unknown = -1, eUnit_px, eUnit_pt};
PRInt32 unit = eUnit_px;
nsAdoptingCString cvalue =
nsContentUtils::GetCharPref("font.size.unit");
if (!cvalue.IsEmpty()) {
if (cvalue.Equals("px")) {
unit = eUnit_px;
}
else if (cvalue.Equals("pt")) {
unit = eUnit_pt;
}
else {
NS_WARNING("unexpected font-size unit -- expected: 'px' or 'pt'");
unit = eUnit_unknown;
}
}
// get font.minimum-size.[langGroup]
pref.Assign("font.minimum-size.");
pref.Append(langGroup);
PRInt32 size = nsContentUtils::GetIntPref(pref.get());
if (unit == eUnit_px) {
mMinimumFontSize = CSSPixelsToAppUnits(size);
}
else if (unit == eUnit_pt) {
mMinimumFontSize = this->PointsToAppUnits(size);
}
// get attributes specific to each generic font
nsCAutoString generic_dot_langGroup;
for (PRInt32 eType = eDefaultFont_Variable; eType < eDefaultFont_COUNT; ++eType) {
generic_dot_langGroup.Assign(kGenericFont[eType]);
generic_dot_langGroup.Append(langGroup);
nsFont* font;
switch (eType) {
case eDefaultFont_Variable: font = &mDefaultVariableFont; break;
case eDefaultFont_Fixed: font = &mDefaultFixedFont; break;
case eDefaultFont_Serif: font = &mDefaultSerifFont; break;
case eDefaultFont_SansSerif: font = &mDefaultSansSerifFont; break;
case eDefaultFont_Monospace: font = &mDefaultMonospaceFont; break;
case eDefaultFont_Cursive: font = &mDefaultCursiveFont; break;
case eDefaultFont_Fantasy: font = &mDefaultFantasyFont; break;
}
// set the default variable font (the other fonts are seen as 'generic' fonts
// in GFX and will be queried there when hunting for alternative fonts)
if (eType == eDefaultFont_Variable) {
MAKE_FONT_PREF_KEY(pref, "font.name", generic_dot_langGroup);
nsAdoptingString value =
nsContentUtils::GetStringPref(pref.get());
if (!value.IsEmpty()) {
font->name.Assign(value);
}
else {
MAKE_FONT_PREF_KEY(pref, "font.default.", langGroup);
value = nsContentUtils::GetStringPref(pref.get());
if (!value.IsEmpty()) {
mDefaultVariableFont.name.Assign(value);
}
}
}
else {
if (eType == eDefaultFont_Monospace) {
// This takes care of the confusion whereby people often expect "monospace"
// to have the same default font-size as "-moz-fixed" (this tentative
// size may be overwritten with the specific value for "monospace" when
// "font.size.monospace.[langGroup]" is read -- see below)
font->size = mDefaultFixedFont.size;
}
else if (eType != eDefaultFont_Fixed) {
// all the other generic fonts are initialized with the size of the
// variable font, but their specific size can supersede later -- see below
font->size = mDefaultVariableFont.size;
}
}
// Bug 84398: for spec purists, a different font-size only applies to the
// .variable. and .fixed. fonts and the other fonts should get |font-size-adjust|.
// The problem is that only GfxWin has the support for |font-size-adjust|. So for
// parity, we enable the ability to set a different font-size on all platforms.
// get font.size.[generic].[langGroup]
// size=0 means 'Auto', i.e., generic fonts retain the size of the variable font
MAKE_FONT_PREF_KEY(pref, "font.size", generic_dot_langGroup);
size = nsContentUtils::GetIntPref(pref.get());
if (size > 0) {
if (unit == eUnit_px) {
font->size = nsPresContext::CSSPixelsToAppUnits(size);
}
else if (unit == eUnit_pt) {
font->size = this->PointsToAppUnits(size);
}
}
// get font.size-adjust.[generic].[langGroup]
// XXX only applicable on GFX ports that handle |font-size-adjust|
MAKE_FONT_PREF_KEY(pref, "font.size-adjust", generic_dot_langGroup);
cvalue = nsContentUtils::GetCharPref(pref.get());
if (!cvalue.IsEmpty()) {
font->sizeAdjust = (float)atof(cvalue.get());
}
#ifdef DEBUG_rbs
printf("%s Family-list:%s size:%d sizeAdjust:%.2f\n",
generic_dot_langGroup.get(),
NS_ConvertUTF16toUTF8(font->name).get(), font->size,
font->sizeAdjust);
#endif
}
}
void
nsPresContext::GetDocumentColorPreferences()
{
PRInt32 useAccessibilityTheme = 0;
PRBool usePrefColors = PR_TRUE;
nsCOMPtr<nsIDocShellTreeItem> docShell(do_QueryReferent(mContainer));
if (docShell) {
PRInt32 docShellType;
docShell->GetItemType(&docShellType);
if (nsIDocShellTreeItem::typeChrome == docShellType) {
usePrefColors = PR_FALSE;
}
else {
mLookAndFeel->GetMetric(nsILookAndFeel::eMetric_UseAccessibilityTheme, useAccessibilityTheme);
usePrefColors = !useAccessibilityTheme;
}
}
if (usePrefColors) {
usePrefColors =
!nsContentUtils::GetBoolPref("browser.display.use_system_colors",
PR_FALSE);
}
if (usePrefColors) {
nsAdoptingCString colorStr =
nsContentUtils::GetCharPref("browser.display.foreground_color");
if (!colorStr.IsEmpty()) {
mDefaultColor = MakeColorPref(colorStr);
}
colorStr =
nsContentUtils::GetCharPref("browser.display.background_color");
if (!colorStr.IsEmpty()) {
mBackgroundColor = MakeColorPref(colorStr);
}
}
else {
mDefaultColor = NS_RGB(0x00, 0x00, 0x00);
mBackgroundColor = NS_RGB(0xFF, 0xFF, 0xFF);
mLookAndFeel->GetColor(nsILookAndFeel::eColor_WindowForeground,
mDefaultColor);
mLookAndFeel->GetColor(nsILookAndFeel::eColor_WindowBackground,
mBackgroundColor);
}
// Wherever we got the default background color from, ensure it is
// opaque.
mBackgroundColor = NS_ComposeColors(NS_RGB(0xFF, 0xFF, 0xFF),
mBackgroundColor);
mUseDocumentColors = !useAccessibilityTheme &&
nsContentUtils::GetBoolPref("browser.display.use_document_colors",
mUseDocumentColors);
}
void
nsPresContext::GetUserPreferences()
{
if (!GetPresShell()) {
// No presshell means nothing to do here. We'll do this when we
// get a presshell.
return;
}
mFontScaler =
nsContentUtils::GetIntPref("browser.display.base_font_scaler",
mFontScaler);
mAutoQualityMinFontSizePixelsPref =
nsContentUtils::GetIntPref("browser.display.auto_quality_min_font_size");
// * document colors
GetDocumentColorPreferences();
// * link colors
mUnderlineLinks =
nsContentUtils::GetBoolPref("browser.underline_anchors", mUnderlineLinks);
nsAdoptingCString colorStr =
nsContentUtils::GetCharPref("browser.anchor_color");
if (!colorStr.IsEmpty()) {
mLinkColor = MakeColorPref(colorStr);
}
colorStr =
nsContentUtils::GetCharPref("browser.active_color");
if (!colorStr.IsEmpty()) {
mActiveLinkColor = MakeColorPref(colorStr);
}
colorStr = nsContentUtils::GetCharPref("browser.visited_color");
if (!colorStr.IsEmpty()) {
mVisitedLinkColor = MakeColorPref(colorStr);
}
mUseFocusColors =
nsContentUtils::GetBoolPref("browser.display.use_focus_colors",
mUseFocusColors);
mFocusTextColor = mDefaultColor;
mFocusBackgroundColor = mBackgroundColor;
colorStr = nsContentUtils::GetCharPref("browser.display.focus_text_color");
if (!colorStr.IsEmpty()) {
mFocusTextColor = MakeColorPref(colorStr);
}
colorStr =
nsContentUtils::GetCharPref("browser.display.focus_background_color");
if (!colorStr.IsEmpty()) {
mFocusBackgroundColor = MakeColorPref(colorStr);
}
mFocusRingWidth =
nsContentUtils::GetIntPref("browser.display.focus_ring_width",
mFocusRingWidth);
mFocusRingOnAnything =
nsContentUtils::GetBoolPref("browser.display.focus_ring_on_anything",
mFocusRingOnAnything);
mFocusRingStyle =
nsContentUtils::GetIntPref("browser.display.focus_ring_style",
mFocusRingStyle);
// * use fonts?
mUseDocumentFonts =
nsContentUtils::GetIntPref("browser.display.use_document_fonts") != 0;
// * replace backslashes with Yen signs? (bug 245770)
mEnableJapaneseTransform =
nsContentUtils::GetBoolPref("layout.enable_japanese_specific_transform");
mPrefScrollbarSide =
nsContentUtils::GetIntPref("layout.scrollbar.side");
GetFontPreferences();
// * image animation
const nsAdoptingCString& animatePref =
nsContentUtils::GetCharPref("image.animation_mode");
if (animatePref.Equals("normal"))
mImageAnimationModePref = imgIContainer::kNormalAnimMode;
else if (animatePref.Equals("none"))
mImageAnimationModePref = imgIContainer::kDontAnimMode;
else if (animatePref.Equals("once"))
mImageAnimationModePref = imgIContainer::kLoopOnceAnimMode;
else // dynamic change to invalid value should act like it does initially
mImageAnimationModePref = imgIContainer::kNormalAnimMode;
PRUint32 bidiOptions = GetBidi();
PRInt32 prefInt =
nsContentUtils::GetIntPref(IBMBIDI_TEXTDIRECTION_STR,
GET_BIDI_OPTION_DIRECTION(bidiOptions));
SET_BIDI_OPTION_DIRECTION(bidiOptions, prefInt);
mPrefBidiDirection = prefInt;
prefInt =
nsContentUtils::GetIntPref(IBMBIDI_TEXTTYPE_STR,
GET_BIDI_OPTION_TEXTTYPE(bidiOptions));
SET_BIDI_OPTION_TEXTTYPE(bidiOptions, prefInt);
prefInt =
nsContentUtils::GetIntPref(IBMBIDI_CONTROLSTEXTMODE_STR,
GET_BIDI_OPTION_CONTROLSTEXTMODE(bidiOptions));
SET_BIDI_OPTION_CONTROLSTEXTMODE(bidiOptions, prefInt);
prefInt =
nsContentUtils::GetIntPref(IBMBIDI_NUMERAL_STR,
GET_BIDI_OPTION_NUMERAL(bidiOptions));
SET_BIDI_OPTION_NUMERAL(bidiOptions, prefInt);
prefInt =
nsContentUtils::GetIntPref(IBMBIDI_SUPPORTMODE_STR,
GET_BIDI_OPTION_SUPPORT(bidiOptions));
SET_BIDI_OPTION_SUPPORT(bidiOptions, prefInt);
prefInt =
nsContentUtils::GetIntPref(IBMBIDI_CHARSET_STR,
GET_BIDI_OPTION_CHARACTERSET(bidiOptions));
SET_BIDI_OPTION_CHARACTERSET(bidiOptions, prefInt);
// We don't need to force reflow: either we are initializing a new
// prescontext or we are being called from UpdateAfterPreferencesChanged()
// which triggers a reflow anyway.
SetBidi(bidiOptions, PR_FALSE);
}
void
nsPresContext::PreferenceChanged(const char* aPrefName)
{
nsDependentCString prefName(aPrefName);
if (prefName.EqualsLiteral("layout.css.dpi")) {
PRInt32 oldAppUnitsPerDevPixel = AppUnitsPerDevPixel();
if (mDeviceContext->CheckDPIChange() && mShell) {
mDeviceContext->FlushFontCache();
// Re-fetch the view manager's window dimensions in case there's a deferred
// resize which hasn't affected our mVisibleArea yet
nscoord oldWidthAppUnits, oldHeightAppUnits;
nsIViewManager* vm = GetViewManager();
vm->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
float oldWidthDevPixels = oldWidthAppUnits/oldAppUnitsPerDevPixel;
float oldHeightDevPixels = oldHeightAppUnits/oldAppUnitsPerDevPixel;
nscoord width = NSToCoordRound(oldWidthDevPixels*AppUnitsPerDevPixel());
nscoord height = NSToCoordRound(oldHeightDevPixels*AppUnitsPerDevPixel());
vm->SetWindowDimensions(width, height);
MediaFeatureValuesChanged(PR_TRUE);
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
return;
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("font."))) {
// Changes to font family preferences don't change anything in the
// computed style data, so the style system won't generate a reflow
// hint for us. We need to do that manually.
// FIXME We could probably also handle changes to
// browser.display.auto_quality_min_font_size here, but that
// probably also requires clearing the text run cache, so don't
// bother (yet, anyway).
mPrefChangePendingNeedsReflow = PR_TRUE;
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("bidi."))) {
// Changes to bidi prefs need to trigger a reflow (see bug 443629)
mPrefChangePendingNeedsReflow = PR_TRUE;
// Changes to bidi.numeral also needs to empty the text run cache.
// This is handled in gfxTextRunWordCache.cpp.
}
// we use a zero-delay timer to coalesce multiple pref updates
if (!mPrefChangedTimer)
{
mPrefChangedTimer = do_CreateInstance("@mozilla.org/timer;1");
if (!mPrefChangedTimer)
return;
mPrefChangedTimer->InitWithFuncCallback(nsPresContext::PrefChangedUpdateTimerCallback, (void*)this, 0, nsITimer::TYPE_ONE_SHOT);
}
}
void
nsPresContext::UpdateAfterPreferencesChanged()
{
mPrefChangedTimer = nsnull;
nsCOMPtr<nsIDocShellTreeItem> docShell(do_QueryReferent(mContainer));
if (docShell) {
PRInt32 docShellType;
docShell->GetItemType(&docShellType);
if (nsIDocShellTreeItem::typeChrome == docShellType)
return;
}
// Initialize our state from the user preferences
GetUserPreferences();
// update the presShell: tell it to set the preference style rules up
if (mShell) {
mShell->SetPreferenceStyleRules(PR_TRUE);
}
mDeviceContext->FlushFontCache();
nsChangeHint hint = nsChangeHint(0);
if (mPrefChangePendingNeedsReflow) {
NS_UpdateHint(hint, NS_STYLE_HINT_REFLOW);
}
RebuildAllStyleData(hint);
}
nsresult
nsPresContext::Init(nsIDeviceContext* aDeviceContext)
{
NS_ASSERTION(!(mInitialized == PR_TRUE), "attempt to reinit pres context");
NS_ENSURE_ARG(aDeviceContext);
mDeviceContext = aDeviceContext;
NS_ADDREF(mDeviceContext);
if (mDeviceContext->SetPixelScale(mFullZoom))
mDeviceContext->FlushFontCache();
mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
if (!mImageLoaders.Init())
return NS_ERROR_OUT_OF_MEMORY;
if (!mBorderImageLoaders.Init())
return NS_ERROR_OUT_OF_MEMORY;
// Get the look and feel service here; default colors will be initialized
// from calling GetUserPreferences() when we get a presshell.
nsresult rv = CallGetService(kLookAndFeelCID, &mLookAndFeel);
if (NS_FAILED(rv)) {
NS_ERROR("LookAndFeel service must be implemented for this toolkit");
return rv;
}
mEventManager = new nsEventStateManager();
if (!mEventManager)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(mEventManager);
mLangService = do_GetService(NS_LANGUAGEATOMSERVICE_CONTRACTID);
// Register callbacks so we're notified when the preferences change
nsContentUtils::RegisterPrefCallback("font.",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::RegisterPrefCallback("browser.display.",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::RegisterPrefCallback("browser.underline_anchors",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::RegisterPrefCallback("browser.anchor_color",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::RegisterPrefCallback("browser.active_color",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::RegisterPrefCallback("browser.visited_color",
nsPresContext::PrefChangedCallback,
this);
nsContentUtils::RegisterPrefCallback("image.animation_mode",
nsPresContext::PrefChangedCallback,
this);
#ifdef IBMBIDI
nsContentUtils::RegisterPrefCallback("bidi.", PrefChangedCallback,
this);
#endif
nsContentUtils::RegisterPrefCallback("layout.css.dpi",
nsPresContext::PrefChangedCallback,
this);
rv = mEventManager->Init();
NS_ENSURE_SUCCESS(rv, rv);
mEventManager->SetPresContext(this);
#ifdef DEBUG
mInitialized = PR_TRUE;
#endif
mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THIN] = CSSPixelsToAppUnits(1);
mBorderWidthTable[NS_STYLE_BORDER_WIDTH_MEDIUM] = CSSPixelsToAppUnits(3);
mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THICK] = CSSPixelsToAppUnits(5);
return NS_OK;
}
// Note: We don't hold a reference on the shell; it has a reference to
// us
void
nsPresContext::SetShell(nsIPresShell* aShell)
{
if (mShell) {
// Remove ourselves as the charset observer from the shell's doc, because
// this shell may be going away for good.
nsIDocument *doc = mShell->GetDocument();
if (doc) {
doc->RemoveCharSetObserver(this);
}
}
mShell = aShell;
if (mShell) {
nsIDocument *doc = mShell->GetDocument();
NS_ASSERTION(doc, "expect document here");
if (doc) {
// Have to update PresContext's mDocument before calling any other methods.
mDocument = doc;
}
// Initialize our state from the user preferences, now that we
// have a presshell, and hence a document.
GetUserPreferences();
if (doc) {
nsIURI *docURI = doc->GetDocumentURI();
if (IsDynamic() && docURI) {
PRBool isChrome = PR_FALSE;
PRBool isRes = PR_FALSE;
docURI->SchemeIs("chrome", &isChrome);
docURI->SchemeIs("resource", &isRes);
if (!isChrome && !isRes)
mImageAnimationMode = mImageAnimationModePref;
else
mImageAnimationMode = imgIContainer::kNormalAnimMode;
}
if (mLangService) {
doc->AddCharSetObserver(this);
UpdateCharSet(doc->GetDocumentCharacterSet());
}
}
}
}
void
nsPresContext::UpdateCharSet(const nsAFlatCString& aCharSet)
{
if (mLangService) {
NS_IF_RELEASE(mLangGroup);
mLangGroup = mLangService->LookupCharSet(aCharSet.get()).get(); // addrefs
// bug 39570: moved from nsLanguageAtomService::LookupCharSet()
#if !defined(XP_BEOS)
if (mLangGroup == nsGkAtoms::Unicode) {
NS_RELEASE(mLangGroup);
NS_IF_ADDREF(mLangGroup = mLangService->GetLocaleLanguageGroup());
}
#endif
GetFontPreferences();
}
#ifdef IBMBIDI
//ahmed
switch (GET_BIDI_OPTION_TEXTTYPE(GetBidi())) {
case IBMBIDI_TEXTTYPE_LOGICAL:
SetVisualMode(PR_FALSE);
break;
case IBMBIDI_TEXTTYPE_VISUAL:
SetVisualMode(PR_TRUE);
break;
case IBMBIDI_TEXTTYPE_CHARSET:
default:
SetVisualMode(IsVisualCharset(aCharSet));
}
#endif // IBMBIDI
}
NS_IMETHODIMP
nsPresContext::Observe(nsISupports* aSubject,
const char* aTopic,
const PRUnichar* aData)
{
if (!nsCRT::strcmp(aTopic, "charset")) {
UpdateCharSet(NS_LossyConvertUTF16toASCII(aData));
mDeviceContext->FlushFontCache();
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
return NS_OK;
}
NS_WARNING("unrecognized topic in nsPresContext::Observe");
return NS_ERROR_FAILURE;
}
// We may want to replace this with something faster, maybe caching the root prescontext
nsPresContext*
nsPresContext::RootPresContext()
{
nsPresContext* pc = this;
for (;;) {
if (pc->mShell) {
nsIFrame* rootFrame = pc->mShell->FrameManager()->GetRootFrame();
if (rootFrame) {
nsIFrame* f = nsLayoutUtils::GetCrossDocParentFrame(rootFrame);
if (f) {
pc = f->PresContext();
continue;
}
}
}
return pc;
}
}
void
nsPresContext::CompatibilityModeChanged()
{
if (!mShell)
return;
// enable/disable the QuirkSheet
mShell->StyleSet()->
EnableQuirkStyleSheet(CompatibilityMode() == eCompatibility_NavQuirks);
}
// Helper function for setting Anim Mode on image
static void SetImgAnimModeOnImgReq(imgIRequest* aImgReq, PRUint16 aMode)
{
if (aImgReq) {
nsCOMPtr<imgIContainer> imgCon;
aImgReq->GetImage(getter_AddRefs(imgCon));
if (imgCon) {
imgCon->SetAnimationMode(aMode);
}
}
}
// Enumeration call back for HashTable
static PLDHashOperator
set_animation_mode(const void * aKey, nsCOMPtr<nsImageLoader>& aData, void* closure)
{
imgIRequest* imgReq = aData->GetRequest();
SetImgAnimModeOnImgReq(imgReq, (PRUint16)NS_PTR_TO_INT32(closure));
return PL_DHASH_NEXT;
}
// IMPORTANT: Assumption is that all images for a Presentation
// have the same Animation Mode (pavlov said this was OK)
//
// Walks content and set the animation mode
// this is a way to turn on/off image animations
void nsPresContext::SetImgAnimations(nsIContent *aParent, PRUint16 aMode)
{
nsCOMPtr<nsIImageLoadingContent> imgContent(do_QueryInterface(aParent));
if (imgContent) {
nsCOMPtr<imgIRequest> imgReq;
imgContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgReq));
SetImgAnimModeOnImgReq(imgReq, aMode);
}
PRUint32 count = aParent->GetChildCount();
for (PRUint32 i = 0; i < count; ++i) {
SetImgAnimations(aParent->GetChildAt(i), aMode);
}
}
void
nsPresContext::SetImageAnimationModeInternal(PRUint16 aMode)
{
NS_ASSERTION(aMode == imgIContainer::kNormalAnimMode ||
aMode == imgIContainer::kDontAnimMode ||
aMode == imgIContainer::kLoopOnceAnimMode, "Wrong Animation Mode is being set!");
// Image animation mode cannot be changed when rendering to a printer.
if (!IsDynamic())
return;
// Set the mode on the image loaders.
mImageLoaders.Enumerate(set_animation_mode, NS_INT32_TO_PTR(aMode));
mBorderImageLoaders.Enumerate(set_animation_mode, NS_INT32_TO_PTR(aMode));
// Now walk the content tree and set the animation mode
// on all the images.
if (mShell != nsnull) {
nsIDocument *doc = mShell->GetDocument();
if (doc) {
nsIContent *rootContent = doc->GetRootContent();
if (rootContent) {
SetImgAnimations(rootContent, aMode);
}
}
}
mImageAnimationMode = aMode;
}
void
nsPresContext::SetImageAnimationModeExternal(PRUint16 aMode)
{
SetImageAnimationModeInternal(aMode);
}
already_AddRefed<nsIFontMetrics>
nsPresContext::GetMetricsFor(const nsFont& aFont)
{
nsIFontMetrics* metrics = nsnull;
mDeviceContext->GetMetricsFor(aFont, mLangGroup, GetUserFontSet(), metrics);
return metrics;
}
const nsFont*
nsPresContext::GetDefaultFont(PRUint8 aFontID) const
{
const nsFont *font;
switch (aFontID) {
// Special (our default variable width font and fixed width font)
case kPresContext_DefaultVariableFont_ID:
font = &mDefaultVariableFont;
break;
case kPresContext_DefaultFixedFont_ID:
font = &mDefaultFixedFont;
break;
// CSS
case kGenericFont_serif:
font = &mDefaultSerifFont;
break;
case kGenericFont_sans_serif:
font = &mDefaultSansSerifFont;
break;
case kGenericFont_monospace:
font = &mDefaultMonospaceFont;
break;
case kGenericFont_cursive:
font = &mDefaultCursiveFont;
break;
case kGenericFont_fantasy:
font = &mDefaultFantasyFont;
break;
default:
font = nsnull;
NS_ERROR("invalid arg");
break;
}
return font;
}
void
nsPresContext::SetFullZoom(float aZoom)
{
if (!mShell || mFullZoom == aZoom) {
return;
}
// Re-fetch the view manager's window dimensions in case there's a deferred
// resize which hasn't affected our mVisibleArea yet
nscoord oldWidthAppUnits, oldHeightAppUnits;
GetViewManager()->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
float oldWidthDevPixels = oldWidthAppUnits / float(mCurAppUnitsPerDevPixel);
float oldHeightDevPixels = oldHeightAppUnits / float(mCurAppUnitsPerDevPixel);
if (mDeviceContext->SetPixelScale(aZoom)) {
mDeviceContext->FlushFontCache();
}
NS_ASSERTION(mSupressResizeReflow == PR_FALSE, "two zooms happening at the same time? impossible!");
mSupressResizeReflow = PR_TRUE;
mFullZoom = aZoom;
GetViewManager()->SetWindowDimensions(NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel()),
NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel()));
if (HasCachedStyleData()) {
MediaFeatureValuesChanged(PR_TRUE);
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
mSupressResizeReflow = PR_FALSE;
mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
}
imgIRequest*
nsPresContext::DoLoadImage(nsPresContext::ImageLoaderTable& aTable,
imgIRequest* aImage,
nsIFrame* aTargetFrame,
PRBool aReflowOnLoad)
{
// look and see if we have a loader for the target frame.
nsCOMPtr<nsImageLoader> loader;
aTable.Get(aTargetFrame, getter_AddRefs(loader));
if (!loader) {
loader = new nsImageLoader();
if (!loader)
return nsnull;
loader->Init(aTargetFrame, this, aReflowOnLoad);
aTable.Put(aTargetFrame, loader);
}
loader->Load(aImage);
imgIRequest *request = loader->GetRequest();
return request;
}
imgIRequest*
nsPresContext::LoadImage(imgIRequest* aImage, nsIFrame* aTargetFrame)
{
return DoLoadImage(mImageLoaders, aImage, aTargetFrame, PR_FALSE);
}
imgIRequest*
nsPresContext::LoadBorderImage(imgIRequest* aImage, nsIFrame* aTargetFrame)
{
return DoLoadImage(mBorderImageLoaders, aImage, aTargetFrame,
aTargetFrame->GetStyleBorder()->ImageBorderDiffers());
}
void
nsPresContext::StopImagesFor(nsIFrame* aTargetFrame)
{
StopBackgroundImageFor(aTargetFrame);
StopBorderImageFor(aTargetFrame);
}
void
nsPresContext::DoStopImageFor(nsPresContext::ImageLoaderTable& aTable,
nsIFrame* aTargetFrame)
{
nsCOMPtr<nsImageLoader> loader;
aTable.Get(aTargetFrame, getter_AddRefs(loader));
if (loader) {
loader->Destroy();
aTable.Remove(aTargetFrame);
}
}
void
nsPresContext::SetContainer(nsISupports* aHandler)
{
mContainer = do_GetWeakReference(aHandler);
if (mContainer) {
GetDocumentColorPreferences();
}
}
already_AddRefed<nsISupports>
nsPresContext::GetContainerInternal() const
{
nsISupports *result = nsnull;
if (mContainer)
CallQueryReferent(mContainer.get(), &result);
return result;
}
already_AddRefed<nsISupports>
nsPresContext::GetContainerExternal() const
{
return GetContainerInternal();
}
#ifdef IBMBIDI
PRBool
nsPresContext::BidiEnabledInternal() const
{
PRBool bidiEnabled = PR_FALSE;
NS_ASSERTION(mShell, "PresShell must be set on PresContext before calling nsPresContext::GetBidiEnabled");
if (mShell) {
nsIDocument *doc = mShell->GetDocument();
NS_ASSERTION(doc, "PresShell has no document in nsPresContext::GetBidiEnabled");
if (doc) {
bidiEnabled = doc->GetBidiEnabled();
}
}
return bidiEnabled;
}
PRBool
nsPresContext::BidiEnabledExternal() const
{
return BidiEnabledInternal();
}
void
nsPresContext::SetBidiEnabled() const
{
if (mShell) {
nsIDocument *doc = mShell->GetDocument();
if (doc) {
doc->SetBidiEnabled();
}
}
}
nsBidiPresUtils*
nsPresContext::GetBidiUtils()
{
if (!mBidiUtils)
mBidiUtils = new nsBidiPresUtils;
return mBidiUtils;
}
void
nsPresContext::SetBidi(PRUint32 aSource, PRBool aForceRestyle)
{
// Don't do all this stuff unless the options have changed.
if (aSource == GetBidi()) {
return;
}
NS_ASSERTION(!(aForceRestyle && (GetBidi() == 0)),
"ForceReflow on new prescontext");
Document()->SetBidiOptions(aSource);
if (IBMBIDI_TEXTDIRECTION_RTL == GET_BIDI_OPTION_DIRECTION(aSource)
|| IBMBIDI_NUMERAL_HINDI == GET_BIDI_OPTION_NUMERAL(aSource)) {
SetBidiEnabled();
}
if (IBMBIDI_TEXTTYPE_VISUAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
SetVisualMode(PR_TRUE);
}
else if (IBMBIDI_TEXTTYPE_LOGICAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
SetVisualMode(PR_FALSE);
}
else {
nsIDocument* doc = mShell->GetDocument();
if (doc) {
SetVisualMode(IsVisualCharset(doc->GetDocumentCharacterSet()));
}
}
if (aForceRestyle) {
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
}
PRUint32
nsPresContext::GetBidi() const
{
return Document()->GetBidiOptions();
}
#endif //IBMBIDI
nsITheme*
nsPresContext::GetTheme()
{
if (!mNoTheme && !mTheme) {
mTheme = do_GetService("@mozilla.org/chrome/chrome-native-theme;1");
if (!mTheme)
mNoTheme = PR_TRUE;
}
return mTheme;
}
void
nsPresContext::ThemeChanged()
{
if (!mPendingThemeChanged) {
sLookAndFeelChanged = PR_TRUE;
sThemeChanged = PR_TRUE;
nsCOMPtr<nsIRunnable> ev =
new nsRunnableMethod<nsPresContext>(this,
&nsPresContext::ThemeChangedInternal);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mPendingThemeChanged = PR_TRUE;
}
}
}
void
nsPresContext::ThemeChangedInternal()
{
mPendingThemeChanged = PR_FALSE;
// Tell the theme that it changed, so it can flush any handles to stale theme
// data.
if (mTheme && sThemeChanged) {
mTheme->ThemeChanged();
sThemeChanged = PR_FALSE;
}
// Clear all cached nsILookAndFeel colors.
if (mLookAndFeel && sLookAndFeelChanged) {
mLookAndFeel->LookAndFeelChanged();
sLookAndFeelChanged = PR_FALSE;
}
// This will force the system metrics to be generated the next time they're used
nsCSSRuleProcessor::FreeSystemMetrics();
// Changes in theme can change system colors (whose changes are
// properly reflected in computed style data), system fonts (whose
// changes are not), and -moz-appearance (whose changes likewise are
// not), so we need to reflow.
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
void
nsPresContext::SysColorChanged()
{
if (!mPendingSysColorChanged) {
sLookAndFeelChanged = PR_TRUE;
nsCOMPtr<nsIRunnable> ev =
new nsRunnableMethod<nsPresContext>(this,
&nsPresContext::SysColorChangedInternal);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mPendingSysColorChanged = PR_TRUE;
}
}
}
void
nsPresContext::SysColorChangedInternal()
{
mPendingSysColorChanged = PR_FALSE;
if (mLookAndFeel && sLookAndFeelChanged) {
// Don't use the cached values for the system colors
mLookAndFeel->LookAndFeelChanged();
sLookAndFeelChanged = PR_FALSE;
}
// Reset default background and foreground colors for the document since
// they may be using system colors
GetDocumentColorPreferences();
// The system color values are computed to colors in the style data,
// so normal style data comparison is sufficient here.
RebuildAllStyleData(nsChangeHint(0));
}
void
nsPresContext::RebuildAllStyleData(nsChangeHint aExtraHint)
{
if (!mShell) {
// We must have been torn down. Nothing to do here.
return;
}
RebuildUserFontSet();
mShell->FrameConstructor()->RebuildAllStyleData(aExtraHint);
}
void
nsPresContext::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint)
{
if (!mShell) {
// We must have been torn down. Nothing to do here.
return;
}
mShell->FrameConstructor()->PostRebuildAllStyleDataEvent(aExtraHint);
}
void
nsPresContext::MediaFeatureValuesChanged(PRBool aCallerWillRebuildStyleData)
{
mPendingMediaFeatureValuesChanged = PR_FALSE;
if (mShell->StyleSet()->MediumFeaturesChanged(this) &&
!aCallerWillRebuildStyleData) {
RebuildAllStyleData(nsChangeHint(0));
}
}
void
nsPresContext::PostMediaFeatureValuesChangedEvent()
{
if (!mPendingMediaFeatureValuesChanged) {
nsCOMPtr<nsIRunnable> ev =
new nsRunnableMethod<nsPresContext>(this,
&nsPresContext::HandleMediaFeatureValuesChangedEvent);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mPendingMediaFeatureValuesChanged = PR_TRUE;
}
}
}
void
nsPresContext::HandleMediaFeatureValuesChangedEvent()
{
// Null-check mShell in case the shell has been destroyed (and the
// event is the only thing holding the pres context alive).
if (mPendingMediaFeatureValuesChanged && mShell) {
MediaFeatureValuesChanged(PR_FALSE);
}
}
void
nsPresContext::SetPaginatedScrolling(PRBool aPaginated)
{
if (mType == eContext_PrintPreview || mType == eContext_PageLayout)
mCanPaginatedScroll = aPaginated;
}
void
nsPresContext::SetPrintSettings(nsIPrintSettings *aPrintSettings)
{
if (mMedium == nsGkAtoms::print)
mPrintSettings = aPrintSettings;
}
PRBool
nsPresContext::EnsureVisible(PRBool aUnsuppressFocus)
{
nsCOMPtr<nsIDocShell> docShell(do_QueryReferent(mContainer));
if (docShell) {
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
// Make sure this is the content viewer we belong with
nsCOMPtr<nsIDocumentViewer> docV(do_QueryInterface(cv));
if (docV) {
nsCOMPtr<nsPresContext> currentPresContext;
docV->GetPresContext(getter_AddRefs(currentPresContext));
if (currentPresContext == this) {
// OK, this is us. We want to call Show() on the content viewer. But
// first, we need to suppress focus changes; otherwise the focus will
// get sent to the wrong place (toplevel window).
nsCOMPtr<nsPIDOMWindow> privWindow = do_GetInterface(docShell);
// XXXbz privWindow should never really be null!
nsIFocusController* fc =
privWindow ? privWindow->GetRootFocusController() : nsnull;
if (fc) {
fc->SetSuppressFocus(PR_TRUE,
"nsPresContext::EnsureVisible Suppression");
}
cv->Show();
if (fc && aUnsuppressFocus) {
fc->SetSuppressFocus(PR_FALSE,
"nsPresContext::EnsureVisible Suppression");
}
return PR_TRUE;
}
}
}
return PR_FALSE;
}
#ifdef MOZ_REFLOW_PERF
void
nsPresContext::CountReflows(const char * aName, nsIFrame * aFrame)
{
if (mShell) {
mShell->CountReflows(aName, aFrame);
}
}
#endif
PRBool
nsPresContext::IsChrome() const
{
PRBool isChrome = PR_FALSE;
nsCOMPtr<nsISupports> container = GetContainer();
if (container) {
nsresult result;
nsCOMPtr<nsIDocShellTreeItem> docShell(do_QueryInterface(container, &result));
if (NS_SUCCEEDED(result) && docShell) {
PRInt32 docShellType;
result = docShell->GetItemType(&docShellType);
if (NS_SUCCEEDED(result)) {
isChrome = nsIDocShellTreeItem::typeChrome == docShellType;
}
}
}
return isChrome;
}
/* virtual */ PRBool
nsPresContext::HasAuthorSpecifiedRules(nsIFrame *aFrame, PRUint32 ruleTypeMask) const
{
return nsRuleNode::
HasAuthorSpecifiedRules(aFrame->GetStyleContext(), ruleTypeMask);
}
static void
InsertFontFaceRule(nsCSSFontFaceRule *aRule, gfxUserFontSet* aFontSet,
PRUint8 aSheetType)
{
PRInt32 type;
NS_ABORT_IF_FALSE(NS_SUCCEEDED(aRule->GetType(type))
&& type == nsICSSRule::FONT_FACE_RULE,
"InsertFontFaceRule passed a non-fontface CSS rule");
// aRule->List();
nsAutoString fontfamily;
nsCSSValue val;
PRUint32 unit;
PRUint32 weight = NS_STYLE_FONT_WEIGHT_NORMAL;
PRUint32 stretch = NS_STYLE_FONT_STRETCH_NORMAL;
PRUint32 italicStyle = FONT_STYLE_NORMAL;
// set up family name
aRule->GetDesc(eCSSFontDesc_Family, val);
unit = val.GetUnit();
if (unit == eCSSUnit_String) {
val.GetStringValue(fontfamily);
fontfamily.Trim("\"");
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face family name has unexpected unit");
// If there is no family name, this rule cannot contribute a
// usable font, so there is no point in processing it further.
return;
}
// set up weight
aRule->GetDesc(eCSSFontDesc_Weight, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Integer || unit == eCSSUnit_Enumerated) {
weight = val.GetIntValue();
} else if (unit == eCSSUnit_Normal) {
weight = NS_STYLE_FONT_WEIGHT_NORMAL;
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face weight has unexpected unit");
}
// set up stretch
aRule->GetDesc(eCSSFontDesc_Stretch, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Enumerated) {
stretch = val.GetIntValue();
} else if (unit == eCSSUnit_Normal) {
stretch = NS_STYLE_FONT_STRETCH_NORMAL;
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face stretch has unexpected unit");
}
// set up font style
aRule->GetDesc(eCSSFontDesc_Style, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Enumerated) {
italicStyle = val.GetIntValue();
} else if (unit == eCSSUnit_Normal) {
italicStyle = FONT_STYLE_NORMAL;
} else {
NS_ASSERTION(unit == eCSSUnit_Null,
"@font-face style has unexpected unit");
}
// set up src array
nsTArray<gfxFontFaceSrc> srcArray;
aRule->GetDesc(eCSSFontDesc_Src, val);
unit = val.GetUnit();
if (unit == eCSSUnit_Array) {
nsCSSValue::Array *srcArr = val.GetArrayValue();
PRUint32 i, numSrc = srcArr->Count();
for (i = 0; i < numSrc; i++) {
val = srcArr->Item(i);
unit = val.GetUnit();
gfxFontFaceSrc *face = srcArray.AppendElements(1);
if (!face)
return;
switch (unit) {
case eCSSUnit_Local_Font:
val.GetStringValue(face->mLocalName);
face->mIsLocal = PR_TRUE;
face->mURI = nsnull;
face->mFormatFlags = 0;
break;
case eCSSUnit_URL:
face->mIsLocal = PR_FALSE;
face->mURI = val.GetURLValue();
NS_ASSERTION(face->mURI, "null url in @font-face rule");
face->mReferrer = val.GetURLStructValue()->mReferrer;
face->mOriginPrincipal = val.GetURLStructValue()->mOriginPrincipal;
NS_ASSERTION(face->mOriginPrincipal, "null origin principal in @font-face rule");
// agent and user stylesheets are treated slightly differently,
// the same-site origin check and access control headers are
// enforced against the sheet principal rather than the document
// principal to allow user stylesheets to include @font-face rules
face->mUseOriginPrincipal = (aSheetType == nsStyleSet::eUserSheet ||
aSheetType == nsStyleSet::eAgentSheet);
face->mLocalName.Truncate();
face->mFormatFlags = 0;
while (i + 1 < numSrc && (val = srcArr->Item(i+1),
val.GetUnit() == eCSSUnit_Font_Format)) {
nsDependentString valueString(val.GetStringBufferValue());
if (valueString.LowerCaseEqualsASCII("opentype")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_OPENTYPE;
} else if (valueString.LowerCaseEqualsASCII("truetype")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_TRUETYPE;
} else if (valueString.LowerCaseEqualsASCII("truetype-aat")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_TRUETYPE_AAT;
} else if (valueString.LowerCaseEqualsASCII("embedded-opentype")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_EOT;
} else if (valueString.LowerCaseEqualsASCII("svg")) {
face->mFormatFlags |= gfxUserFontSet::FLAG_FORMAT_SVG;
}
i++;
}
break;
default:
NS_ASSERTION(unit == eCSSUnit_Local_Font || unit == eCSSUnit_URL,
"strange unit type in font-face src array");
break;
}
}
} else {
NS_ASSERTION(unit == eCSSUnit_Null, "@font-face src has unexpected unit");
}
if (!fontfamily.IsEmpty() && srcArray.Length() > 0) {
aFontSet->AddFontFace(fontfamily, srcArray, weight, stretch, italicStyle);
}
}
gfxUserFontSet*
nsPresContext::GetUserFontSetInternal()
{
// We want to initialize the user font set lazily the first time the
// user asks for it, rather than building it too early and forcing
// rule cascade creation. Thus we try to enforce the invariant that
// we *never* build the user font set until the first call to
// GetUserFontSet. However, once it's been requested, we can't wait
// for somebody to call GetUserFontSet in order to rebuild it (see
// comments below in RebuildUserFontSet for why).
if (mUserFontSetDirty) {
// If this assertion fails, and there have actually been changes to
// @font-face rules, then we will call StyleChangeReflow in
// FlushUserFontSet. If we're in the middle of reflow,
// that's a bad thing to do, and the caller was responsible for
// flushing first. If we're not (e.g., in frame construction), it's
// ok.
#ifdef DEBUG
{
PRBool inReflow;
NS_ASSERTION(!mGetUserFontSetCalled ||
(NS_SUCCEEDED(mShell->IsReflowLocked(&inReflow)) &&
!inReflow),
"FlushUserFontSet should have been called first");
}
#endif
FlushUserFontSet();
}
mGetUserFontSetCalled = PR_TRUE;
return mUserFontSet;
}
gfxUserFontSet*
nsPresContext::GetUserFontSetExternal()
{
return GetUserFontSetInternal();
}
void
nsPresContext::FlushUserFontSet()
{
if (!mShell)
return; // we've been torn down
if (mUserFontSetDirty) {
if (gfxPlatform::GetPlatform()->DownloadableFontsEnabled()) {
nsRefPtr<gfxUserFontSet> oldUserFontSet = mUserFontSet;
nsTArray<nsFontFaceRuleContainer> rules;
if (!mShell->StyleSet()->AppendFontFaceRules(this, rules))
return;
PRBool differ;
if (rules.Length() == mFontFaceRules.Length()) {
differ = PR_FALSE;
for (PRUint32 i = 0, i_end = rules.Length(); i < i_end; ++i) {
if (rules[i].mRule != mFontFaceRules[i].mRule ||
rules[i].mSheetType != mFontFaceRules[i].mSheetType) {
differ = PR_TRUE;
break;
}
}
} else {
differ = PR_TRUE;
}
// Only rebuild things if the set of @font-face rules is different.
if (differ) {
NS_IF_RELEASE(mUserFontSet);
if (rules.Length() > 0) {
gfxUserFontSet *fs = new nsUserFontSet(this);
if (!fs)
return;
mUserFontSet = fs;
NS_ADDREF(mUserFontSet);
for (PRUint32 i = 0, i_end = rules.Length(); i < i_end; ++i) {
InsertFontFaceRule(rules[i].mRule, fs, rules[i].mSheetType);
}
}
}
#ifdef DEBUG
PRBool success =
#endif
rules.SwapElements(mFontFaceRules);
NS_ASSERTION(success, "should never fail given both are heap arrays");
if (mGetUserFontSetCalled && oldUserFontSet != mUserFontSet) {
// If we've changed, created, or destroyed a user font set, we
// need to trigger a style change reflow.
// We need to enqueue a style change reflow (for later) to
// reflect that we're dropping @font-face rules. (However,
// without a reflow, nothing will happen to start any downloads
// that are needed.)
UserFontSetUpdated();
}
}
mUserFontSetDirty = PR_FALSE;
}
}
void
nsPresContext::RebuildUserFontSet()
{
if (!mGetUserFontSetCalled) {
// We want to lazily build the user font set the first time it's
// requested (so we don't force creation of rule cascades too
// early), so don't do anything now.
return;
}
mUserFontSetDirty = PR_TRUE;
// Somebody has already asked for the user font set, so we need to
// post an event to rebuild it. Setting the user font set to be dirty
// and lazily rebuilding it isn't sufficient, since it is only the act
// of rebuilding it that will trigger the style change reflow that
// calls GetUserFontSet. (This reflow causes rebuilding of text runs,
// which starts font loads, whose completion causes another style
// change reflow).
if (!mPostedFlushUserFontSet) {
nsCOMPtr<nsIRunnable> ev =
new nsRunnableMethod<nsPresContext>(this,
&nsPresContext::HandleRebuildUserFontSet);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mPostedFlushUserFontSet = PR_TRUE;
}
}
}
void
nsPresContext::UserFontSetUpdated()
{
if (!mShell)
return;
// Changes to the set of available fonts can cause updates to layout by:
//
// 1. Changing the font used for text, which changes anything that
// depends on text measurement, including line breaking and
// intrinsic widths, and any other parts of layout that depend on
// font metrics. This requires a style change reflow to update.
//
// 2. Changing the value of the 'ex' and 'ch' units in style data,
// which also depend on font metrics. Updating this information
// requires rebuilding the rule tree from the top, avoiding the
// reuse of cached data even when no style rules have changed.
PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW);
}
void
nsPresContext::FireDOMPaintEvent()
{
nsCOMPtr<nsPIDOMWindow> ourWindow = mDocument->GetWindow();
if (!ourWindow)
return;
nsISupports* eventTarget = ourWindow;
if (mSameDocDirtyRegion.IsEmpty() && !IsChrome()) {
// Don't tell the window about this event, it should not know that
// something happened in a subdocument. Tell only the chrome event handler.
// (Events sent to the window get propagated to the chrome event handler
// automatically.)
eventTarget = ourWindow->GetChromeEventHandler();
if (!eventTarget) {
return;
}
}
// Events sent to the window get propagated to the chrome event handler
// automatically.
nsNotifyPaintEvent event(PR_TRUE, NS_AFTERPAINT, mSameDocDirtyRegion,
mCrossDocDirtyRegion);
// Empty our regions now in case dispatching the event causes more damage
// (hopefully it won't, or we're likely to get an infinite loop! At least
// it won't be blocking app execution though).
mSameDocDirtyRegion.SetEmpty();
mCrossDocDirtyRegion.SetEmpty();
// Even if we're not telling the window about the event (so eventTarget is
// the chrome event handler, not the window), the window is still
// logically the event target.
event.target = do_QueryInterface(ourWindow);
nsEventDispatcher::Dispatch(eventTarget, this, &event);
}
static PRBool MayHavePaintEventListener(nsPIDOMWindow* aInnerWindow)
{
if (!aInnerWindow)
return PR_FALSE;
if (aInnerWindow->HasPaintEventListeners())
return PR_TRUE;
nsPIDOMEventTarget* chromeEventHandler = aInnerWindow->GetChromeEventHandler();
if (!chromeEventHandler)
return PR_FALSE;
nsCOMPtr<nsIEventListenerManager> manager;
chromeEventHandler->GetListenerManager(PR_FALSE, getter_AddRefs(manager));
if (manager && manager->MayHavePaintEventListener())
return PR_TRUE;
nsCOMPtr<nsINode> node = do_QueryInterface(chromeEventHandler);
if (node)
return MayHavePaintEventListener(node->GetOwnerDoc()->GetInnerWindow());
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(chromeEventHandler);
if (window)
return MayHavePaintEventListener(window);
return PR_FALSE;
}
void
nsPresContext::NotifyInvalidation(const nsRect& aRect, PRBool aIsCrossDoc)
{
// If there is no paint event listener, then we don't need to fire
// the asynchronous event. We don't even need to record invalidation.
// MayHavePaintEventListener is pretty cheap and we could make it
// even cheaper by providing a more efficient
// nsPIDOMWindow::GetListenerManager.
if (aRect.IsEmpty() ||
!MayHavePaintEventListener(mDocument->GetInnerWindow()))
return;
if (mSameDocDirtyRegion.IsEmpty() && mCrossDocDirtyRegion.IsEmpty()) {
// No event is pending. Dispatch one now.
nsCOMPtr<nsIRunnable> ev =
new nsRunnableMethod<nsPresContext>(this,
&nsPresContext::FireDOMPaintEvent);
NS_DispatchToCurrentThread(ev);
}
nsRegion* r = aIsCrossDoc ? &mCrossDocDirtyRegion : &mSameDocDirtyRegion;
r->Or(*r, aRect);
r->SimplifyOutward(10);
}
PRBool
nsPresContext::HasCachedStyleData()
{
return mShell && mShell->StyleSet()->HasCachedStyleData();
}
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