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gecko-dev/layout/base/nsPresContext.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* IBM Corporation
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 03/20/2000 IBM Corp. BiDi - ability to change the default direction of the browser
*
*/
#include "nsCOMPtr.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsIPref.h"
#include "nsILinkHandler.h"
#include "nsIStyleSet.h"
#include "nsFrameImageLoader.h"
#include "nsIFrameManager.h"
#include "nsIImageGroup.h"
#include "nsIFrame.h"
#include "nsIRenderingContext.h"
#include "nsEventStateManager.h"
#include "nsIURL.h"
#include "nsIDocument.h"
#include "nsIStyleContext.h"
#include "nsLayoutAtoms.h"
#include "nsILookAndFeel.h"
#include "nsWidgetsCID.h"
#include "nsIComponentManager.h"
#include "nsIURIContentListener.h"
#include "nsIInterfaceRequestor.h"
#include "nsIServiceManager.h"
#ifdef _WIN32
#include <windows.h>
#endif
int
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
}
static NS_DEFINE_IID(kIPresContextIID, NS_IPRESCONTEXT_IID);
static NS_DEFINE_IID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
static NS_DEFINE_IID(kILookAndFeelIID, NS_ILOOKANDFEEL_IID);
nsPresContext::nsPresContext()
: mDefaultFont("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))
{
NS_INIT_REFCNT();
mCompatibilityMode = eCompatibility_Standard;
mCompatibilityLocked = PR_FALSE;
mWidgetRenderingMode = eWidgetRendering_Gfx;
mLookAndFeel = nsnull;
mShell = nsnull;
#ifdef _WIN32
// XXX This needs to be elsewhere, e.g., part of nsIDeviceContext
mDefaultColor = ::GetSysColor(COLOR_WINDOWTEXT);
mDefaultBackgroundColor = ::GetSysColor(COLOR_WINDOW);
#else
mDefaultColor = NS_RGB(0x00, 0x00, 0x00);
mDefaultBackgroundColor = NS_RGB(0xFF, 0xFF, 0xFF);
#endif
mDefaultBackgroundImageAttachment = NS_STYLE_BG_ATTACHMENT_SCROLL;
mDefaultBackgroundImageRepeat = NS_STYLE_BG_REPEAT_XY;
mDefaultBackgroundImageOffsetX = mDefaultBackgroundImageOffsetY = 0;
mDefaultDirection = NS_STYLE_DIRECTION_LTR;
}
nsPresContext::~nsPresContext()
{
mShell = nsnull;
Stop();
if (mImageGroup) {
// Interrupt any loading images. This also stops all looping
// image animations.
mImageGroup->Interrupt();
}
if (mEventManager)
mEventManager->SetPresContext(nsnull); // unclear if this is needed, but can't hurt
NS_IF_RELEASE(mLookAndFeel);
// Unregister preference callbacks
if (mPrefs) {
mPrefs->UnregisterCallback("browser.screen_resolution", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.use_document_fonts", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.use_document_colors", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.background_color", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.foreground_color", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.base_font_scaler", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.wfe.use_windows_colors", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("font.", PrefChangedCallback, (void*)this);
mPrefs->UnregisterCallback("browser.display.direction", PrefChangedCallback, (void*)this);
}
}
NS_IMPL_ISUPPORTS(nsPresContext, kIPresContextIID);
void
nsPresContext::GetFontPreferences()
{
if (mPrefs) {
char* value = nsnull;
mPrefs->CopyCharPref("font.default", &value);
if (value) {
mDefaultFont.name = value;
nsAllocator::Free(value);
value = nsnull;
}
if (mLangGroup) {
nsAutoString pref("font.size.variable.");
const PRUnichar* langGroup = nsnull;
mLangGroup->GetUnicode(&langGroup);
pref.Append(langGroup);
char name[128];
pref.ToCString(name, sizeof(name));
PRInt32 variableSize = 16;
mPrefs->GetIntPref(name, &variableSize);
pref = "font.size.fixed.";
pref.Append(langGroup);
pref.ToCString(name, sizeof(name));
PRInt32 fixedSize = 13;
mPrefs->GetIntPref(name, &fixedSize);
char* unit = nsnull;
mPrefs->CopyCharPref("font.size.unit", &unit);
char* defaultUnit = "px";
if (!unit) {
unit = defaultUnit;
}
if (!PL_strcmp(unit, "px")) {
float p2t;
GetScaledPixelsToTwips(&p2t);
mDefaultFont.size = NSFloatPixelsToTwips((float) variableSize, p2t);
mDefaultFixedFont.size = NSFloatPixelsToTwips((float) fixedSize, p2t);
}
else if (!PL_strcmp(unit, "pt")) {
mDefaultFont.size = NSIntPointsToTwips(variableSize);
mDefaultFixedFont.size = NSIntPointsToTwips(fixedSize);
}
else {
float p2t;
GetScaledPixelsToTwips(&p2t);
mDefaultFont.size = NSFloatPixelsToTwips((float) variableSize, p2t);
mDefaultFixedFont.size = NSFloatPixelsToTwips((float) fixedSize, p2t);
}
if (unit != defaultUnit) {
nsAllocator::Free(unit);
unit = nsnull;
}
}
}
}
void
nsPresContext::GetUserPreferences()
{
PRInt32 prefInt;
if (NS_OK == mPrefs->GetIntPref("browser.base_font_scaler", &prefInt)) {
mFontScaler = prefInt;
}
if (NS_OK == mPrefs->GetIntPref("nglayout.compatibility.mode", &prefInt)) {
// XXX this should really be a state on the webshell instead of using prefs
switch (prefInt) {
case 1:
mCompatibilityLocked = PR_TRUE;
mCompatibilityMode = eCompatibility_Standard;
break;
case 2:
mCompatibilityLocked = PR_TRUE;
mCompatibilityMode = eCompatibility_NavQuirks;
break;
case 0: // auto
default:
mCompatibilityLocked = PR_FALSE;
break;
}
}
else {
mCompatibilityLocked = PR_FALSE; // auto
}
if (NS_OK == mPrefs->GetIntPref("nglayout.widget.mode", &prefInt)) {
mWidgetRenderingMode = (enum nsWidgetRendering)prefInt; // bad cast
}
PRBool usePrefColors = PR_TRUE;
#ifdef _WIN32
PRBool boolPref;
// XXX Is Windows the only platform that uses this?
if (NS_OK == mPrefs->GetBoolPref("browser.wfe.use_windows_colors", &boolPref)) {
usePrefColors = !boolPref;
}
#endif
if (usePrefColors) {
PRUint32 colorPref;
if (NS_OK == mPrefs->GetColorPrefDWord("browser.foreground_color", &colorPref)) {
mDefaultColor = (nscolor)colorPref;
}
if (NS_OK == mPrefs->GetColorPrefDWord("browser.background_color", &colorPref)) {
mDefaultBackgroundColor = (nscolor)colorPref;
}
}
if (NS_OK == mPrefs->GetIntPref("browser.display.direction", &prefInt)) {
mDefaultDirection = prefInt;
}
GetFontPreferences();
}
void
nsPresContext::PreferenceChanged(const char* aPrefName)
{
// Initialize our state from the user preferences
GetUserPreferences();
if (mDeviceContext) {
mDeviceContext->FlushFontCache();
}
if (mShell) {
// Have the root frame's style context remap its style based on the
// user preferences
nsIFrame* rootFrame;
mShell->GetRootFrame(&rootFrame);
if (rootFrame) {
nsIStyleContext* rootStyleContext;
rootFrame->GetStyleContext(&rootStyleContext);
rootStyleContext->RemapStyle(this);
NS_RELEASE(rootStyleContext);
// 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();
}
}
}
NS_IMETHODIMP
nsPresContext::Init(nsIDeviceContext* aDeviceContext)
{
NS_ASSERTION(!(mInitialized == PR_TRUE), "attempt to reinit pres context");
mDeviceContext = dont_QueryInterface(aDeviceContext);
mPrefs = do_GetService(NS_PREF_PROGID);
if (mPrefs) {
// Register callbacks so we're notified when the preferences change
mPrefs->RegisterCallback("browser.screen_resolution", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.use_document_fonts", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.use_document_colors", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.background_color", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.foreground_color", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.base_font_scaler", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.wfe.use_windows_colors", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("font.", PrefChangedCallback, (void*)this);
mPrefs->RegisterCallback("browser.display.direction", PrefChangedCallback, (void*)this);
// Initialize our state from the user preferences
GetUserPreferences();
}
#ifdef DEBUG
mInitialized = PR_TRUE;
#endif
return NS_OK;
}
// Note: We don't hold a reference on the shell; it has a reference to
// us
NS_IMETHODIMP
nsPresContext::SetShell(nsIPresShell* aShell)
{
mShell = aShell;
if (nsnull != mShell) {
nsCOMPtr<nsIDocument> doc;
if (NS_SUCCEEDED(mShell->GetDocument(getter_AddRefs(doc)))) {
NS_ASSERTION(doc, "expect document here");
if (doc) {
doc->GetBaseURL(*getter_AddRefs(mBaseURL));
NS_ASSERTION(mDeviceContext, "expect device context here");
if (mDeviceContext) {
nsAutoString charset;
doc->GetDocumentCharacterSet(charset);
mDeviceContext->GetLangGroup(charset, getter_AddRefs(mLangGroup));
GetFontPreferences();
}
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetShell(nsIPresShell** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mShell;
NS_IF_ADDREF(mShell);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetCompatibilityMode(nsCompatibility* aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mCompatibilityMode;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetCompatibilityMode(nsCompatibility aMode)
{
if (! mCompatibilityLocked) {
mCompatibilityMode = aMode;
}
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetWidgetRenderingMode(nsWidgetRendering* aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mWidgetRenderingMode;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetWidgetRenderingMode(nsWidgetRendering aMode)
{
mWidgetRenderingMode = aMode;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetLookAndFeel(nsILookAndFeel** aLookAndFeel)
{
NS_PRECONDITION(nsnull != aLookAndFeel, "null ptr");
if (nsnull == aLookAndFeel) {
return NS_ERROR_NULL_POINTER;
}
nsresult result = NS_OK;
if (! mLookAndFeel) {
result = nsComponentManager::CreateInstance(kLookAndFeelCID, nsnull,
kILookAndFeelIID, (void**)&mLookAndFeel);
if (NS_FAILED(result)) {
mLookAndFeel = nsnull;
}
}
NS_IF_ADDREF(mLookAndFeel);
*aLookAndFeel = mLookAndFeel;
return result;
}
NS_IMETHODIMP
nsPresContext::GetBaseURL(nsIURI** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mBaseURL;
NS_IF_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::ResolveStyleContextFor(nsIContent* aContent,
nsIStyleContext* aParentContext,
PRBool aForceUnique,
nsIStyleContext** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
nsIStyleContext* result = nsnull;
nsCOMPtr<nsIStyleSet> set;
nsresult rv = mShell->GetStyleSet(getter_AddRefs(set));
if (NS_SUCCEEDED(rv)) {
if (set) {
result = set->ResolveStyleFor(this, aContent, aParentContext,
aForceUnique);
if (nsnull == result) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
}
*aResult = result;
return rv;
}
NS_IMETHODIMP
nsPresContext::ResolvePseudoStyleContextFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
PRBool aForceUnique,
nsIStyleContext** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
nsIStyleContext* result = nsnull;
nsCOMPtr<nsIStyleSet> set;
nsresult rv = mShell->GetStyleSet(getter_AddRefs(set));
if (NS_SUCCEEDED(rv)) {
if (set) {
result = set->ResolvePseudoStyleFor(this, aParentContent, aPseudoTag,
aParentContext, aForceUnique);
if (nsnull == result) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
}
*aResult = result;
return rv;
}
NS_IMETHODIMP
nsPresContext::ProbePseudoStyleContextFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
PRBool aForceUnique,
nsIStyleContext** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
nsIStyleContext* result = nsnull;
nsCOMPtr<nsIStyleSet> set;
nsresult rv = mShell->GetStyleSet(getter_AddRefs(set));
if (NS_SUCCEEDED(rv)) {
if (set) {
result = set->ProbePseudoStyleFor(this, aParentContent, aPseudoTag,
aParentContext, aForceUnique);
}
}
*aResult = result;
return rv;
}
NS_IMETHODIMP
nsPresContext::ReParentStyleContext(nsIFrame* aFrame,
nsIStyleContext* aNewParentContext)
{
NS_PRECONDITION(aFrame, "null ptr");
if (! aFrame) {
return NS_ERROR_NULL_POINTER;
}
nsCOMPtr<nsIFrameManager> manager;
nsresult rv = mShell->GetFrameManager(getter_AddRefs(manager));
if (NS_SUCCEEDED(rv) && manager) {
rv = manager->ReParentStyleContext(this, aFrame, aNewParentContext);
}
return rv;
}
NS_IMETHODIMP
nsPresContext::GetMetricsFor(const nsFont& aFont, nsIFontMetrics** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
nsIFontMetrics* metrics = nsnull;
if (mDeviceContext) {
mDeviceContext->GetMetricsFor(aFont, mLangGroup, metrics);
}
*aResult = metrics;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultFont(nsFont& aResult)
{
aResult = mDefaultFont;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultFont(const nsFont& aFont)
{
mDefaultFont = aFont;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultFixedFont(nsFont& aResult)
{
aResult = mDefaultFixedFont;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultFixedFont(const nsFont& aFont)
{
mDefaultFixedFont = aFont;
return NS_OK;
}
const nsFont&
nsPresContext::GetDefaultFontDeprecated()
{
return mDefaultFont;
}
const nsFont&
nsPresContext::GetDefaultFixedFontDeprecated()
{
return mDefaultFixedFont;
}
NS_IMETHODIMP
nsPresContext::GetFontScaler(PRInt32* aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mFontScaler;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetFontScaler(PRInt32 aScaler)
{
mFontScaler = aScaler;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultColor(nscolor* aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mDefaultColor;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultBackgroundColor(nscolor* aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mDefaultBackgroundColor;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultBackgroundImage(nsString& aImage)
{
aImage = mDefaultBackgroundImage;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultBackgroundImageRepeat(PRUint8* aRepeat)
{
NS_PRECONDITION(nsnull != aRepeat, "null ptr");
if (nsnull == aRepeat) { return NS_ERROR_NULL_POINTER; }
*aRepeat = mDefaultBackgroundImageRepeat;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultBackgroundImageOffset(nscoord* aX, nscoord* aY)
{
NS_PRECONDITION((nsnull != aX) && (nsnull != aY), "null ptr");
if (!aX || !aY) { return NS_ERROR_NULL_POINTER; }
*aX = mDefaultBackgroundImageOffsetX;
*aY = mDefaultBackgroundImageOffsetY;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultBackgroundImageAttachment(PRUint8* aAttachment)
{
NS_PRECONDITION(nsnull != aAttachment, "null ptr");
if (nsnull == aAttachment) { return NS_ERROR_NULL_POINTER; }
*aAttachment = mDefaultBackgroundImageAttachment;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultColor(nscolor aColor)
{
mDefaultColor = aColor;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultBackgroundColor(nscolor aColor)
{
mDefaultBackgroundColor = aColor;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultBackgroundImage(const nsString& aImage)
{
mDefaultBackgroundImage = aImage;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultBackgroundImageRepeat(PRUint8 aRepeat)
{
mDefaultBackgroundImageRepeat = aRepeat;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultBackgroundImageOffset(nscoord aX, nscoord aY)
{
mDefaultBackgroundImageOffsetX = aX;
mDefaultBackgroundImageOffsetY = aY;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultBackgroundImageAttachment(PRUint8 aAttachment)
{
mDefaultBackgroundImageAttachment = aAttachment;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetVisibleArea(nsRect& aResult)
{
aResult = mVisibleArea;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetVisibleArea(const nsRect& r)
{
mVisibleArea = r;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetPixelsToTwips(float* aResult) const
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
float p2t = 1.0f;
if (mDeviceContext) {
mDeviceContext->GetDevUnitsToAppUnits(p2t);
}
*aResult = p2t;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetTwipsToPixels(float* aResult) const
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
float app2dev = 1.0f;
if (mDeviceContext) {
mDeviceContext->GetAppUnitsToDevUnits(app2dev);
}
*aResult = app2dev;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetScaledPixelsToTwips(float* aResult) const
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
float scale = 1.0f;
if (mDeviceContext)
{
float p2t;
mDeviceContext->GetDevUnitsToAppUnits(p2t);
mDeviceContext->GetCanonicalPixelScale(scale);
scale = p2t * scale;
}
*aResult = scale;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDeviceContext(nsIDeviceContext** aResult) const
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mDeviceContext;
NS_IF_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetImageGroup(nsIImageGroup** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
if (!mImageGroup) {
// Create image group
nsresult rv = NS_NewImageGroup(getter_AddRefs(mImageGroup));
if (NS_OK != rv) {
return rv;
}
// Initialize the image group
nsCOMPtr<nsIURIContentListener> loadHandler (do_GetInterface(mContainer, &rv));
if (NS_SUCCEEDED(rv) && loadHandler)
{
nsCOMPtr<nsISupports> loadContext;
loadHandler->GetLoadCookie(getter_AddRefs(loadContext));
rv = mImageGroup->Init(mDeviceContext, loadContext);
}
if (NS_OK != rv) {
return rv;
}
}
*aResult = mImageGroup;
NS_IF_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::StartLoadImage(const nsString& aURL,
const nscolor* aBackgroundColor,
const nsSize* aDesiredSize,
nsIFrame* aTargetFrame,
nsIFrameImageLoaderCB aCallBack,
void* aClosure,
nsIFrameImageLoader** aResult)
{
if (mStopped) {
if (aResult) {
*aResult = nsnull;
}
return NS_OK;
}
// Allow for a null target frame argument (for precached images)
if (nsnull != aTargetFrame) {
// Mark frame as having loaded an image
nsFrameState state;
aTargetFrame->GetFrameState(&state);
state |= NS_FRAME_HAS_LOADED_IMAGES;
aTargetFrame->SetFrameState(state);
}
// Lookup image request in our loaders array (maybe the load request
// has already been made for that url at the desired size).
PRInt32 i, n = mImageLoaders.Count();
nsIFrameImageLoader* loader;
for (i = 0; i < n; i++) {
PRBool same;
loader = (nsIFrameImageLoader*) mImageLoaders.ElementAt(i);
loader->IsSameImageRequest(aURL, aBackgroundColor, aDesiredSize, &same);
if (same) {
// This is pretty sick, but because we can get a notification
// *before* the caller has returned we have to store into
// aResult before calling the AddFrame method.
if (aResult) {
NS_ADDREF(loader);
*aResult = loader;
}
// Add frame to list of interested frames for this loader
loader->AddFrame(aTargetFrame, aCallBack, aClosure);
return NS_OK;
}
}
// Create image group if needed
nsresult rv;
if (!mImageGroup) {
nsCOMPtr<nsIImageGroup> group;
rv = GetImageGroup(getter_AddRefs(group)); // sets mImageGroup as side effect
if (NS_OK != rv) {
return rv;
}
}
// We haven't seen that image before. Create a new loader and
// start it going.
rv = NS_NewFrameImageLoader(&loader);
if (NS_OK != rv) {
return rv;
}
mImageLoaders.AppendElement(loader);
// This is pretty sick, but because we can get a notification
// *before* the caller has returned we have to store into aResult
// before calling the loaders init method.
if (aResult) {
*aResult = loader;
NS_ADDREF(loader);
}
rv = loader->Init(this, mImageGroup, aURL, aBackgroundColor, aDesiredSize,
aTargetFrame, aCallBack, aClosure);
if (NS_OK != rv) {
mImageLoaders.RemoveElement(loader);
loader->StopImageLoad();
NS_RELEASE(loader);
// Undo premature store of reslut
if (aResult) {
*aResult = nsnull;
NS_RELEASE(loader);
}
return rv;
}
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::Stop(void)
{
PRInt32 n = mImageLoaders.Count();
for (PRInt32 i = 0; i < n; i++) {
nsIFrameImageLoader* loader;
loader = (nsIFrameImageLoader*) mImageLoaders.ElementAt(i);
loader->StopImageLoad();
NS_RELEASE(loader);
}
mImageLoaders.Clear();
mStopped = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::StopLoadImage(nsIFrame* aTargetFrame,
nsIFrameImageLoader* aLoader)
{
PRInt32 i, n = mImageLoaders.Count();
nsIFrameImageLoader* loader;
for (i = 0; i < n; i++) {
loader = (nsIFrameImageLoader*) mImageLoaders.ElementAt(i);
if (loader == aLoader) {
// Remove frame from list of interested frames for this loader
loader->RemoveFrame(aTargetFrame);
// If loader is no longer loading for anybody and its safe to
// nuke it, nuke it.
PRBool safe;
loader->SafeToDestroy(&safe);
if (safe) {
loader->StopImageLoad();
NS_RELEASE(loader);
mImageLoaders.RemoveElementAt(i);
n--;
i--;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::StopAllLoadImagesFor(nsIFrame* aTargetFrame)
{
nsFrameState state;
aTargetFrame->GetFrameState(&state);
if (NS_FRAME_HAS_LOADED_IMAGES & state) {
nsIFrameImageLoader* loader;
PRInt32 i, n = mImageLoaders.Count();
for (i = 0; i < n; i++) {
PRBool safe;
loader = (nsIFrameImageLoader*) mImageLoaders.ElementAt(i);
loader->RemoveFrame(aTargetFrame);
loader->SafeToDestroy(&safe);
if (safe) {
loader->StopImageLoad();
NS_RELEASE(loader);
mImageLoaders.RemoveElementAt(i);
n--;
i--;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetLinkHandler(nsILinkHandler* aHandler)
{
mLinkHandler = aHandler;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetLinkHandler(nsILinkHandler** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mLinkHandler;
NS_IF_ADDREF(mLinkHandler);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetContainer(nsISupports* aHandler)
{
mContainer = aHandler;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetContainer(nsISupports** aResult)
{
NS_PRECONDITION(nsnull != aResult, "null ptr");
if (nsnull == aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = mContainer;
NS_IF_ADDREF(mContainer);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetEventStateManager(nsIEventStateManager** aManager)
{
NS_PRECONDITION(nsnull != aManager, "null ptr");
if (nsnull == aManager) {
return NS_ERROR_NULL_POINTER;
}
if (!mEventManager) {
nsresult rv = NS_NewEventStateManager(getter_AddRefs(mEventManager));
if (NS_OK != rv) {
return rv;
}
}
//Not refcnted, set null in destructor
mEventManager->SetPresContext(this);
*aManager = mEventManager;
NS_IF_ADDREF(*aManager);
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::GetDefaultDirection(PRUint8* aDirection)
{
*aDirection = mDefaultDirection;
return NS_OK;
}
NS_IMETHODIMP
nsPresContext::SetDefaultDirection(PRUint8 aDirection)
{
mDefaultDirection = aDirection;
return NS_OK;
}
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