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e3aebd9c61
gecko-dev/layout/base/nsPresContext.cpp
bzbarsky%mit.edu e3aebd9c61 Use the content policy REJECT reason as a basis for our "whether to show alt 
text" decision instead of reading prefs ourselves.  Bug 202906, r=mvl, sr=jst
2005-03-02 04:05:12 +00:00

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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):
*
* 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 "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 "nsLayoutAtoms.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 "nsIScriptGlobalObject.h"
#include "nsIDOMWindow.h"
#include "nsXPIDLString.h"
#include "nsIWeakReferenceUtils.h"
#include "nsCSSRendering.h"
#include "prprf.h"
#include "nsContentPolicyUtils.h"
#include "nsIScriptGlobalObject.h"
#include "nsIDOMDocument.h"
#include "nsAutoPtr.h"
#include "nsEventStateManager.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"
#include "nsISelectionImageService.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 PR_CALLBACK
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
}
#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
PR_STATIC_CALLBACK(PRBool) destroy_loads(nsHashKey *aKey, void *aData, void* closure)
{
nsISupports *sup = NS_REINTERPRET_CAST(nsISupports*, aData);
nsImageLoader *loader = NS_REINTERPRET_CAST(nsImageLoader*, sup);
loader->Destroy();
return PR_TRUE;
}
static NS_DEFINE_CID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
#include "nsContentCID.h"
static NS_DEFINE_CID(kSelectionImageService, NS_SELECTIONIMAGESERVICE_CID);
// NOTE! nsPresContext::operator new() zeroes out all members, so don't
// bother initializing members to 0.
nsPresContext::nsPresContext(nsPresContextType aType)
: mType(aType),
mViewportStyleOverflow(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO),
mCompatibilityMode(eCompatibility_FullStandards),
mImageAnimationModePref(imgIContainer::kNormalAnimMode),
mDefaultVariableFont("serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(12)),
mDefaultFixedFont("monospace", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(10)),
mDefaultSerifFont("serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(12)),
mDefaultSansSerifFont("sans-serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(12)),
mDefaultMonospaceFont("monospace", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(10)),
mDefaultCursiveFont("cursive", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(12)),
mDefaultFantasyFont("fantasy", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, 0, NSIntPointsToTwips(12))
{
// 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;
mLanguageSpecificTransformType = eLanguageSpecificTransformType_Unknown;
if (aType == eContext_Galley) {
mMedium = nsLayoutAtoms::screen;
mImageAnimationMode = imgIContainer::kNormalAnimMode;
} else {
SetBackgroundImageDraw(PR_FALSE);
SetBackgroundColorDraw(PR_FALSE);
mImageAnimationMode = imgIContainer::kDontAnimMode;
mNeverAnimate = PR_TRUE;
mMedium = nsLayoutAtoms::print;
mPaginated = PR_TRUE;
if (aType == eContext_PrintPreview) {
mCanPaginatedScroll = PR_TRUE;
mPageDim.SetRect(-1, -1, -1, -1);
} else {
mPageDim.SetRect(0, 0, 0, 0);
}
}
}
nsPresContext::~nsPresContext()
{
mImageLoaders.Enumerate(destroy_loads);
NS_PRECONDITION(!mShell, "Presshell forgot to clear our mShell pointer");
SetShell(nsnull);
if (mEventManager) {
mEventManager->SetPresContext(nsnull); // unclear if this is needed, but can't hurt
NS_RELEASE(mEventManager);
}
// 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
NS_IF_RELEASE(mDeviceContext);
NS_IF_RELEASE(mLookAndFeel);
NS_IF_RELEASE(mLangGroup);
}
NS_IMPL_ISUPPORTS2(nsPresContext, nsPresContext, nsIObserver)
#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."
};
void
nsPresContext::GetFontPreferences()
{
if (!mLangGroup)
return;
/* 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
*/
float p2t = ScaledPixelsToTwips();
mDefaultVariableFont.size = NSFloatPixelsToTwips((float)16, p2t);
mDefaultFixedFont.size = NSFloatPixelsToTwips((float)13, p2t);
const char *langGroup;
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 (size > 0) {
if (unit == eUnit_px) {
mMinimumFontSize = NSFloatPixelsToTwips((float)size, p2t);
}
else if (unit == eUnit_pt) {
mMinimumFontSize = NSIntPointsToTwips(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;
default: NS_ERROR("not reached - bogus to silence some compilers"); 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 = NSFloatPixelsToTwips((float)size, p2t);
}
else if (unit == eUnit_pt) {
font->size = NSIntPointsToTwips(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_ConvertUCS2toUTF8(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);
}
mUseDocumentColors = !useAccessibilityTheme &&
nsContentUtils::GetBoolPref("browser.display.use_document_colors",
mUseDocumentColors);
}
void
nsPresContext::GetUserPreferences()
{
mFontScaler =
nsContentUtils::GetIntPref("browser.display.base_font_scaler",
mFontScaler);
// * 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);
// * 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");
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;
#ifdef IBMBIDI
PRInt32 prefInt =
nsContentUtils::GetIntPref("bidi.direction",
GET_BIDI_OPTION_DIRECTION(mBidi));
SET_BIDI_OPTION_DIRECTION(mBidi, prefInt);
prefInt =
nsContentUtils::GetIntPref("bidi.texttype",
GET_BIDI_OPTION_TEXTTYPE(mBidi));
SET_BIDI_OPTION_TEXTTYPE(mBidi, prefInt);
prefInt =
nsContentUtils::GetIntPref("bidi.controlstextmode",
GET_BIDI_OPTION_CONTROLSTEXTMODE(mBidi));
SET_BIDI_OPTION_CONTROLSTEXTMODE(mBidi, prefInt);
prefInt =
nsContentUtils::GetIntPref("bidi.numeral",
GET_BIDI_OPTION_NUMERAL(mBidi));
SET_BIDI_OPTION_NUMERAL(mBidi, prefInt);
prefInt =
nsContentUtils::GetIntPref("bidi.support",
GET_BIDI_OPTION_SUPPORT(mBidi));
SET_BIDI_OPTION_SUPPORT(mBidi, prefInt);
prefInt =
nsContentUtils::GetIntPref("bidi.characterset",
GET_BIDI_OPTION_CHARACTERSET(mBidi));
SET_BIDI_OPTION_CHARACTERSET(mBidi, prefInt);
#endif
}
void
nsPresContext::ClearStyleDataAndReflow()
{
if (mShell) {
// Clear out all our style data.
mShell->StyleSet()->ClearStyleData(this);
// Force a reflow of the root frame
// XXX We really should only do a reflow if a preference that affects
// formatting changed, e.g., a font change. If it's just a color change
// then we only need to repaint...
mShell->StyleChangeReflow();
}
}
void
nsPresContext::PreferenceChanged(const char* aPrefName)
{
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();
ClearStyleDataAndReflow();
}
nsresult
nsPresContext::Init(nsIDeviceContext* aDeviceContext)
{
NS_ASSERTION(!(mInitialized == PR_TRUE), "attempt to reinit pres context");
NS_ENSURE_ARG(aDeviceContext);
mDeviceContext = aDeviceContext;
NS_ADDREF(mDeviceContext);
// Get the look and feel service here; default colors will be initialized
// from calling GetUserPreferences() below.
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
// Initialize our state from the user preferences
GetUserPreferences();
rv = mEventManager->Init();
NS_ENSURE_SUCCESS(rv, rv);
mEventManager->SetPresContext(this);
#ifdef DEBUG
mInitialized = PR_TRUE;
#endif
float pixelsToTwips = PixelsToTwips();
mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THIN] = NSIntPixelsToTwips(1, pixelsToTwips);
mBorderWidthTable[NS_STYLE_BORDER_WIDTH_MEDIUM] = NSIntPixelsToTwips(3, pixelsToTwips);
mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THICK] = NSIntPixelsToTwips(5, pixelsToTwips);
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) {
nsIURI *baseURI = doc->GetBaseURI();
if (mMedium != nsLayoutAtoms::print && baseURI) {
PRBool isChrome = PR_FALSE;
PRBool isRes = PR_FALSE;
baseURI->SchemeIs("chrome", &isChrome);
baseURI->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
if (mLangGroup == nsLayoutAtoms::Japanese && mEnableJapaneseTransform) {
mLanguageSpecificTransformType =
eLanguageSpecificTransformType_Japanese;
}
else {
mLanguageSpecificTransformType =
eLanguageSpecificTransformType_None;
}
// bug 39570: moved from nsLanguageAtomService::LookupCharSet()
#if !defined(XP_BEOS)
if (mLangGroup == nsLayoutAtoms::Unicode) {
NS_RELEASE(mLangGroup);
NS_IF_ADDREF(mLangGroup = mLangService->GetLocaleLanguageGroup());
}
#endif
GetFontPreferences();
}
#ifdef IBMBIDI
//ahmed
switch (GET_BIDI_OPTION_TEXTTYPE(mBidi)) {
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_LossyConvertUCS2toASCII(aData));
mDeviceContext->FlushFontCache();
ClearStyleDataAndReflow();
return NS_OK;
}
NS_WARNING("unrecognized topic in nsPresContext::Observe");
return NS_ERROR_FAILURE;
}
void
nsPresContext::SetCompatibilityMode(nsCompatibility aMode)
{
mCompatibilityMode = aMode;
if (!mShell)
return;
// enable/disable the QuirkSheet
mShell->StyleSet()->
EnableQuirkStyleSheet(mCompatibilityMode == 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
PR_STATIC_CALLBACK(PRBool) set_animation_mode(nsHashKey *aKey, void *aData, void* closure)
{
nsISupports *sup = NS_REINTERPRET_CAST(nsISupports*, aData);
nsImageLoader *loader = NS_REINTERPRET_CAST(nsImageLoader*, sup);
imgIRequest* imgReq = loader->GetRequest();
SetImgAnimModeOnImgReq(imgReq, (PRUint16)NS_PTR_TO_INT32(closure));
return PR_TRUE;
}
// 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 (mMedium == nsLayoutAtoms::print)
return;
// This hash table contains a list of background images
// so iterate over it and set the mode
mImageLoaders.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::GetMetricsForInternal(const nsFont& aFont)
{
nsIFontMetrics* metrics = nsnull;
mDeviceContext->GetMetricsFor(aFont, mLangGroup, metrics);
return metrics;
}
already_AddRefed<nsIFontMetrics>
nsPresContext::GetMetricsForExternal(const nsFont& aFont)
{
return GetMetricsForInternal(aFont);
}
const nsFont*
nsPresContext::GetDefaultFontInternal(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;
}
const nsFont*
nsPresContext::GetDefaultFontExternal(PRUint8 aFontID) const
{
return GetDefaultFontInternal(aFontID);
}
float
nsPresContext::TwipsToPixelsForFonts() const
{
float app2dev;
#ifdef NS_PRINT_PREVIEW
// If an alternative DC is available we want to use
// it to get the scaling factor for fonts. Usually, the AltDC
// is a printing DC so therefore we need to get the printers
// scaling values for calculating the font heights
nsCOMPtr<nsIDeviceContext> altDC;
mDeviceContext->GetAltDevice(getter_AddRefs(altDC));
if (altDC) {
app2dev = altDC->AppUnitsToDevUnits();
} else {
app2dev = mDeviceContext->AppUnitsToDevUnits();
}
#else
app2dev = mDeviceContext->AppUnitsToDevUnits();
#endif
return app2dev;
}
float
nsPresContext::ScaledPixelsToTwips() const
{
float scale;
float p2t;
p2t = mDeviceContext->DevUnitsToAppUnits();
if (mDoScaledTwips) {
mDeviceContext->GetCanonicalPixelScale(scale);
scale = p2t * scale;
} else {
scale = p2t;
}
return scale;
}
imgIRequest*
nsPresContext::LoadImage(imgIRequest* aImage, nsIFrame* aTargetFrame)
{
// look and see if we have a loader for the target frame.
nsVoidKey key(aTargetFrame);
nsImageLoader *loader = NS_REINTERPRET_CAST(nsImageLoader*, mImageLoaders.Get(&key)); // addrefs
if (!loader) {
loader = new nsImageLoader();
if (!loader)
return nsnull;
NS_ADDREF(loader); // new
loader->Init(aTargetFrame, this);
mImageLoaders.Put(&key, loader);
}
loader->Load(aImage);
imgIRequest *request = loader->GetRequest();
NS_RELEASE(loader);
return request;
}
void
nsPresContext::StopImagesFor(nsIFrame* aTargetFrame)
{
nsVoidKey key(aTargetFrame);
nsImageLoader *loader = NS_REINTERPRET_CAST(nsImageLoader*, mImageLoaders.Get(&key)); // addrefs
if (loader) {
loader->Destroy();
NS_RELEASE(loader);
mImageLoaders.Remove(&key);
}
}
void
nsPresContext::SetContainer(nsISupports* aHandler)
{
mContainer = do_GetWeakReference(aHandler);
if (mContainer) {
GetDocumentColorPreferences();
}
}
already_AddRefed<nsISupports>
nsPresContext::GetContainerInternal()
{
nsISupports *result;
if (mContainer)
CallQueryReferent(mContainer.get(), &result);
else
result = nsnull;
return result;
}
already_AddRefed<nsISupports>
nsPresContext::GetContainerExternal()
{
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(PRBool aBidiEnabled) const
{
if (mShell) {
nsIDocument *doc = mShell->GetDocument();
if (doc) {
doc->SetBidiEnabled(aBidiEnabled);
}
}
}
nsBidiPresUtils*
nsPresContext::GetBidiUtils()
{
if (!mBidiUtils)
mBidiUtils = new nsBidiPresUtils;
return mBidiUtils;
}
void
nsPresContext::SetBidi(PRUint32 aSource, PRBool aForceReflow)
{
mBidi = aSource;
if (IBMBIDI_TEXTDIRECTION_RTL == GET_BIDI_OPTION_DIRECTION(mBidi)
|| IBMBIDI_NUMERAL_HINDI == GET_BIDI_OPTION_NUMERAL(mBidi)) {
SetBidiEnabled(PR_TRUE);
}
if (IBMBIDI_TEXTTYPE_VISUAL == GET_BIDI_OPTION_TEXTTYPE(mBidi)) {
SetVisualMode(PR_TRUE);
}
else if (IBMBIDI_TEXTTYPE_LOGICAL == GET_BIDI_OPTION_TEXTTYPE(mBidi)) {
SetVisualMode(PR_FALSE);
}
else {
nsIDocument* doc = mShell->GetDocument();
if (doc) {
SetVisualMode(IsVisualCharset(doc->GetDocumentCharacterSet()));
}
}
if (mShell && aForceReflow) {
ClearStyleDataAndReflow();
}
}
#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()
{
// Tell the theme that it changed, so it can flush any handles to stale theme
// data.
if (mTheme)
mTheme->ThemeChanged();
// Clear all cached nsILookAndFeel colors.
if (mLookAndFeel)
mLookAndFeel->LookAndFeelChanged();
// We have to clear style data because the assumption of style rule
// immutability has been violated since any style rule that uses
// system colors or fonts (and probably -moz-appearance as well) has
// changed.
nsPresContext::ClearStyleDataAndReflow();
}
void
nsPresContext::SysColorChanged()
{
if (mLookAndFeel) {
// Don't use the cached values for the system colors
mLookAndFeel->LookAndFeelChanged();
}
// Reset default background and foreground colors for the document since
// they may be using system colors
GetDocumentColorPreferences();
// Clear out all of the style data since it may contain RGB values
// which originated from system colors.
nsCOMPtr<nsISelectionImageService> imageService;
nsresult result;
imageService = do_GetService(kSelectionImageService, &result);
if (NS_SUCCEEDED(result) && imageService)
{
imageService->Reset();
}
// We need to do a full reflow (and view update) here. Clearing the style
// data without reflowing/updating views will lead to incorrect change hints
// later, because when generating change hints, any style structs which have
// been cleared and not reread are assumed to not be used at all.
ClearStyleDataAndReflow();
}
void
nsPresContext::GetPageDim(nsRect* aActualRect, nsRect* aAdjRect)
{
if (mMedium == nsLayoutAtoms::print) {
if (aActualRect) {
PRInt32 width, height;
nsresult rv = mDeviceContext->GetDeviceSurfaceDimensions(width, height);
if (NS_SUCCEEDED(rv))
aActualRect->SetRect(0, 0, width, height);
}
if (aAdjRect)
*aAdjRect = mPageDim;
} else {
if (aActualRect)
aActualRect->SetRect(0, 0, 0, 0);
if (aAdjRect)
aAdjRect->SetRect(0, 0, 0, 0);
}
}
void
nsPresContext::SetPageDim(const nsRect& aPageDim)
{
if (mMedium == nsLayoutAtoms::print)
mPageDim = aPageDim;
}
void
nsPresContext::SetPaginatedScrolling(PRBool aPaginated)
{
if (mType == eContext_PrintPreview)
mCanPaginatedScroll = aPaginated;
}
void
nsPresContext::SetPrintSettings(nsIPrintSettings *aPrintSettings)
{
if (mMedium == nsLayoutAtoms::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;
}
nsresult
NS_NewPresContext(nsPresContext::nsPresContextType aType,
nsPresContext** aInstancePtrResult)
{
nsPresContext *context = new nsPresContext(aType);
if (!context)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aInstancePtrResult = context);
return NS_OK;
}
#ifdef MOZ_REFLOW_PERF
void
nsPresContext::CountReflows(const char * aName,
PRUint32 aType, nsIFrame * aFrame)
{
if (mShell) {
mShell->CountReflows(aName, aType, aFrame);
}
}
void
nsPresContext::PaintCount(const char * aName,
nsIRenderingContext* aRenderingContext,
nsIFrame * aFrame, PRUint32 aColor)
{
if (mShell) {
mShell->PaintCount(aName, aRenderingContext, this, aFrame, aColor);
}
}
#endif
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