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gecko-dev/layout/generic/nsImageFrame.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):
*/
#include "nsHTMLParts.h"
#include "nsCOMPtr.h"
#include "nsImageFrame.h"
#include "nsString.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIFrameImageLoader.h"
#include "nsIPresShell.h"
#include "nsHTMLIIDs.h"
#include "nsIImage.h"
#include "nsIWidget.h"
#include "nsHTMLAtoms.h"
#include "nsIHTMLAttributes.h"
#include "nsIDocument.h"
#include "nsIHTMLDocument.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsImageMap.h"
#include "nsILinkHandler.h"
#include "nsIURL.h"
#include "nsIIOService.h"
#include "nsIURL.h"
#include "nsIServiceManager.h"
#include "nsNetUtil.h"
static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLContainerFrame.h"
#include "prprf.h"
#include "nsIFontMetrics.h"
#include "nsCSSRendering.h"
#include "nsIDOMHTMLAnchorElement.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDeviceContext.h"
#include "nsINameSpaceManager.h"
#include "nsTextFragment.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsIStyleSet.h"
#include "nsLayoutAtoms.h"
#include "nsISizeOfHandler.h"
#include "nsIFrameManager.h"
#include "nsIScriptSecurityManager.h"
#ifdef DEBUG
#undef NOISY_IMAGE_LOADING
#else
#undef NOISY_IMAGE_LOADING
#endif
static NS_DEFINE_IID(kIHTMLDocumentIID, NS_IHTMLDOCUMENT_IID);
// Value's for mSuppress
#define SUPPRESS_UNSET 0
#define DONT_SUPPRESS 1
#define SUPPRESS 2
#define DEFAULT_SUPPRESS 3
// Default alignment value (so we can tell an unset value from a set value)
#define ALIGN_UNSET PRUint8(-1)
nsresult
NS_NewImageFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsImageFrame* it = new (aPresShell) nsImageFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsImageFrame::nsImageFrame() :
mLowSrcImageLoader(nsnull)
{
}
nsImageFrame::~nsImageFrame()
{
if (mLowSrcImageLoader != nsnull) {
delete mLowSrcImageLoader;
}
}
NS_METHOD
nsImageFrame::Destroy(nsIPresContext* aPresContext)
{
// Tell our image map, if there is one, to clean up
// This causes the nsImageMap to unregister itself as
// a DOM listener.
if(mImageMap) {
mImageMap->Destroy();
NS_RELEASE(mImageMap);
}
// Release image loader first so that it's refcnt can go to zero
mImageLoader.StopAllLoadImages(aPresContext);
if (mLowSrcImageLoader != nsnull) {
mLowSrcImageLoader->StopAllLoadImages(aPresContext);
}
return nsLeafFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsImageFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsLeafFrame::Init(aPresContext, aContent, aParent,
aContext, aPrevInFlow);
// See if we have a SRC attribute
nsAutoString src;
nsresult ca;
ca = mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::src, src);
if ((NS_CONTENT_ATTR_HAS_VALUE != ca) || (src.Length() == 0))
{
// Let's see if this is an object tag and we have a DATA attribute
nsIAtom* tag;
mContent->GetTag(tag);
if(tag == nsHTMLAtoms::object)
mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::data, src);
NS_IF_RELEASE(tag);
}
nsAutoString lowSrc;
nsresult lowSrcResult;
lowSrcResult = mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::lowsrc, lowSrc);
// Set the image loader's source URL and base URL
nsIURI* baseURL = nsnull;
nsIHTMLContent* htmlContent;
rv = mContent->QueryInterface(kIHTMLContentIID, (void**)&htmlContent);
if (NS_SUCCEEDED(rv)) {
htmlContent->GetBaseURL(baseURL);
NS_RELEASE(htmlContent);
}
else {
nsIDocument* doc;
rv = mContent->GetDocument(doc);
if (NS_SUCCEEDED(rv)) {
doc->GetBaseURL(baseURL);
NS_RELEASE(doc);
}
}
if (NS_CONTENT_ATTR_HAS_VALUE == lowSrcResult && lowSrc.Length() > 0) {
mLowSrcImageLoader = new nsHTMLImageLoader;
if (mLowSrcImageLoader != nsnull) {
mLowSrcImageLoader->Init(this, UpdateImageFrame, (void*)mLowSrcImageLoader, baseURL, lowSrc);
}
}
mImageLoader.Init(this, UpdateImageFrame, (void*)&mImageLoader, baseURL, src);
NS_IF_RELEASE(baseURL);
mInitialLoadCompleted = PR_FALSE;
return rv;
}
nsresult
nsImageFrame::UpdateImageFrame(nsIPresContext* aPresContext,
nsHTMLImageLoader* aLoader,
nsIFrame* aFrame,
void* aClosure,
PRUint32 aStatus)
{
nsImageFrame* frame = (nsImageFrame*) aFrame;
return frame->UpdateImage(aPresContext, aStatus, aClosure);
}
nsresult
nsImageFrame::UpdateImage(nsIPresContext* aPresContext, PRUint32 aStatus, void* aClosure)
{
#ifdef NOISY_IMAGE_LOADING
ListTag(stdout);
printf(": UpdateImage: status=%x\n", aStatus);
#endif
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
// check to see if an image error occurred
PRBool imageFailedToLoad = PR_FALSE;
if (NS_IMAGE_LOAD_STATUS_ERROR & aStatus) { // We failed to load the image. Notify the pres shell
// One of the two images didn't load, which one?
// see if we are loading the lowsrc image
if (mLowSrcImageLoader != nsnull) {
// We ARE loading the lowsrc image
// check to see if the closure data is the lowsrc
if (aClosure == mLowSrcImageLoader) {
// The lowsrc failed to load, but only set the bool to true
// true if the src image failed.
imageFailedToLoad = mImageLoader.GetImage() == nsnull || (mImageLoader.GetLoadStatus() & NS_IMAGE_LOAD_STATUS_ERROR);
} else {
// src failed to load,
// see if the lowsrc is here so we can paint it instead
imageFailedToLoad = (mLowSrcImageLoader->GetLoadStatus() & NS_IMAGE_LOAD_STATUS_ERROR) != 0;
}
} else {
imageFailedToLoad = PR_TRUE;
}
}
// if src failed and there is no lowsrc
// or both failed to load, then notify the PresShell
if (imageFailedToLoad) {
if (presShell) {
nsAutoString usemap;
mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::usemap, usemap);
// We failed to load the image. Notify the pres shell if we aren't an image map
if (usemap.Length() == 0) {
presShell->CantRenderReplacedElement(aPresContext, this);
}
}
} else if (NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE & aStatus) {
if (mParent) {
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(presShell, (nsIFrame*) this);
}
else {
NS_ASSERTION(0, "No parent to pass the reflow request up to.");
}
}
#if 0 // ifdef'ing out the deleting of the lowsrc image
// if the "src" image was change via script to an iage that
// didn't exist, the the author would expect the lowsrc to be displayed.
// now check to see if we have the entire low
if (mLowSrcImageLoader != nsnull) {
nsIImage * image = mImageLoader.GetImage();
if (image) {
PRInt32 imgSrcLinesLoaded = image != nsnull?image->GetDecodedY2():-1;
if (image->GetDecodedY2() == image->GetHeight()) {
delete mLowSrcImageLoader;
mLowSrcImageLoader = nsnull;
}
NS_RELEASE(image);
}
}
#endif
return NS_OK;
}
void
nsImageFrame::GetDesiredSize(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize)
{
PRBool cancelledReflow = PR_FALSE;
if (mLowSrcImageLoader != nsnull && !(mImageLoader.GetLoadStatus() & NS_IMAGE_LOAD_STATUS_IMAGE_READY)) {
PRBool gotDesiredSize = mLowSrcImageLoader->GetDesiredSize(aPresContext, &aReflowState, aDesiredSize);
/*if (gotDesiredSize) {
// We have our "final" desired size. Cancel any pending
// incremental reflows aimed at this frame.
nsIPresShell* shell;
aPresContext->GetShell(&shell);
if (shell) {
shell->CancelReflowCommand(this, nsnull);
NS_RELEASE(shell);
}
}*/
}
// Must ask for desiredSize to start loading of image
// that seems like a bogus API
if (mImageLoader.GetDesiredSize(aPresContext, &aReflowState, aDesiredSize)) {
if (!cancelledReflow) {
// We have our "final" desired size. Cancel any pending
// incremental reflows aimed at this frame.
nsIPresShell* shell;
aPresContext->GetShell(&shell);
if (shell) {
shell->CancelReflowCommand(this, nsnull);
NS_RELEASE(shell);
}
}
}
}
void
nsImageFrame::GetInnerArea(nsIPresContext* aPresContext,
nsRect& aInnerArea) const
{
aInnerArea.x = mBorderPadding.left;
aInnerArea.y = mBorderPadding.top;
aInnerArea.width = mRect.width -
(mBorderPadding.left + mBorderPadding.right);
aInnerArea.height = mRect.height -
(mBorderPadding.top + mBorderPadding.bottom);
}
NS_IMETHODIMP
nsImageFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsImageFrame", aReflowState.reason);
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("enter nsImageFrame::Reflow: availSize=%d,%d",
aReflowState.availableWidth, aReflowState.availableHeight));
NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
GetDesiredSize(aPresContext, aReflowState, aMetrics);
AddBordersAndPadding(aPresContext, aReflowState, aMetrics, mBorderPadding);
if (nsnull != aMetrics.maxElementSize) {
// If we have a percentage based width (and no height), then our MES width is 0
if (eStyleUnit_Percent == aReflowState.mStylePosition->mWidth.GetUnit() &&
eStyleUnit_Coord != aReflowState.mStylePosition->mHeight.GetUnit()) {
aMetrics.maxElementSize->width = 0;
} else {
aMetrics.maxElementSize->width = aMetrics.width;
}
aMetrics.maxElementSize->height = aMetrics.height;
}
if (aMetrics.mFlags & NS_REFLOW_CALC_MAX_WIDTH) {
aMetrics.mMaximumWidth = aMetrics.width;
}
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit nsImageFrame::Reflow: size=%d,%d",
aMetrics.width, aMetrics.height));
return NS_OK;
}
// Computes the width of the specified string. aMaxWidth specifies the maximum
// width available. Once this limit is reached no more characters are measured.
// The number of characters that fit within the maximum width are returned in
// aMaxFit. NOTE: it is assumed that the fontmetrics have already been selected
// into the rendering context before this is called (for performance). MMP
void
nsImageFrame::MeasureString(const PRUnichar* aString,
PRInt32 aLength,
nscoord aMaxWidth,
PRUint32& aMaxFit,
nsIRenderingContext& aContext)
{
nscoord totalWidth = 0;
nscoord spaceWidth;
aContext.GetWidth(' ', spaceWidth);
aMaxFit = 0;
while (aLength > 0) {
// Find the next place we can line break
PRUint32 len = aLength;
PRBool trailingSpace = PR_FALSE;
for (PRInt32 i = 0; i < aLength; i++) {
if (XP_IS_SPACE(aString[i]) && (i > 0)) {
len = i; // don't include the space when measuring
trailingSpace = PR_TRUE;
break;
}
}
// Measure this chunk of text, and see if it fits
nscoord width;
aContext.GetWidth(aString, len, width);
PRBool fits = (totalWidth + width) <= aMaxWidth;
// If it fits on the line, or it's the first word we've processed then
// include it
if (fits || (0 == totalWidth)) {
// New piece fits
totalWidth += width;
// If there's a trailing space then see if it fits as well
if (trailingSpace) {
if ((totalWidth + spaceWidth) <= aMaxWidth) {
totalWidth += spaceWidth;
} else {
// Space won't fit. Leave it at the end but don't include it in
// the width
fits = PR_FALSE;
}
len++;
}
aMaxFit += len;
aString += len;
aLength -= len;
}
if (!fits) {
break;
}
}
}
// Formats the alt-text to fit within the specified rectangle. Breaks lines
// between words if a word would extend past the edge of the rectangle
void
nsImageFrame::DisplayAltText(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsString& aAltText,
const nsRect& aRect)
{
const nsStyleColor* color =
(const nsStyleColor*)mStyleContext->GetStyleData(eStyleStruct_Color);
const nsStyleFont* font =
(const nsStyleFont*)mStyleContext->GetStyleData(eStyleStruct_Font);
// Set font and color
aRenderingContext.SetColor(color->mColor);
aRenderingContext.SetFont(font->mFont);
// Format the text to display within the formatting rect
nsIFontMetrics* fm;
aRenderingContext.GetFontMetrics(fm);
nscoord maxDescent, height;
fm->GetMaxDescent(maxDescent);
fm->GetHeight(height);
// XXX It would be nice if there was a way to have the font metrics tell
// use where to break the text given a maximum width. At a minimum we need
// to be able to get the break character...
const PRUnichar* str = aAltText.GetUnicode();
PRInt32 strLen = aAltText.Length();
nscoord y = aRect.y;
while ((strLen > 0) && ((y + maxDescent) < aRect.YMost())) {
// Determine how much of the text to display on this line
PRUint32 maxFit; // number of characters that fit
MeasureString(str, strLen, aRect.width, maxFit, aRenderingContext);
// Display the text
aRenderingContext.DrawString(str, maxFit, aRect.x, y);
// Move to the next line
str += maxFit;
strLen -= maxFit;
y += height;
}
NS_RELEASE(fm);
}
struct nsRecessedBorder : public nsStyleSpacing {
nsRecessedBorder(nscoord aBorderWidth)
: nsStyleSpacing()
{
nsStyleCoord styleCoord(aBorderWidth);
mBorder.SetLeft(styleCoord);
mBorder.SetTop(styleCoord);
mBorder.SetRight(styleCoord);
mBorder.SetBottom(styleCoord);
mBorderStyle[0] = NS_STYLE_BORDER_STYLE_INSET;
mBorderStyle[1] = NS_STYLE_BORDER_STYLE_INSET;
mBorderStyle[2] = NS_STYLE_BORDER_STYLE_INSET;
mBorderStyle[3] = NS_STYLE_BORDER_STYLE_INSET;
mBorderColor[0] = 0;
mBorderColor[1] = 0;
mBorderColor[2] = 0;
mBorderColor[3] = 0;
mHasCachedMargin = mHasCachedPadding = mHasCachedBorder = PR_FALSE;
}
};
void
nsImageFrame::DisplayAltFeedback(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
PRInt32 aIconId)
{
// Calculate the inner area
nsRect inner;
GetInnerArea(aPresContext, inner);
// Display a recessed one pixel border
float p2t;
nscoord borderEdgeWidth;
aPresContext->GetScaledPixelsToTwips(&p2t);
borderEdgeWidth = NSIntPixelsToTwips(1, p2t);
// Make sure we have enough room to actually render the border within
// our frame bounds
if ((inner.width < 2 * borderEdgeWidth) || (inner.height < 2 * borderEdgeWidth)) {
return;
}
// Paint the border
nsRecessedBorder recessedBorder(borderEdgeWidth);
nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this, inner,
inner, recessedBorder, mStyleContext, 0);
// Adjust the inner rect to account for the one pixel recessed border,
// and a six pixel padding on each edge
inner.Deflate(NSIntPixelsToTwips(7, p2t), NSIntPixelsToTwips(7, p2t));
if (inner.IsEmpty()) {
return;
}
// Clip so we don't render outside the inner rect
PRBool clipState;
aRenderingContext.PushState();
aRenderingContext.SetClipRect(inner, nsClipCombine_kIntersect, clipState);
// Display the icon
nsIDeviceContext* dc;
aRenderingContext.GetDeviceContext(dc);
nsIImage* icon;
if (NS_SUCCEEDED(dc->LoadIconImage(aIconId, icon)) && icon) {
aRenderingContext.DrawImage(icon, inner.x, inner.y);
// Reduce the inner rect by the width of the icon, and leave an
// additional six pixels padding
PRInt32 iconWidth = NSIntPixelsToTwips(icon->GetWidth() + 6, p2t);
inner.x += iconWidth;
inner.width -= iconWidth;
NS_RELEASE(icon);
}
NS_RELEASE(dc);
// If there's still room, display the alt-text
if (!inner.IsEmpty()) {
nsAutoString altText;
if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::alt, altText)) {
DisplayAltText(aPresContext, aRenderingContext, altText, inner);
}
}
aRenderingContext.PopState(clipState);
}
NS_METHOD
nsImageFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
const nsStyleDisplay* disp = (const nsStyleDisplay*)
mStyleContext->GetStyleData(eStyleStruct_Display);
if (disp->IsVisible() && mRect.width && mRect.height) {
// First paint background and borders
nsLeafFrame::Paint(aPresContext, aRenderingContext, aDirtyRect,
aWhichLayer);
// first get to see if lowsrc image is here
PRInt32 lowSrcLinesLoaded = -1;
PRInt32 imgSrcLinesLoaded = -1;
nsIImage * lowImage = nsnull;
nsIImage * image = nsnull;
// if lowsrc is here
if (mLowSrcImageLoader != nsnull) {
lowImage = mLowSrcImageLoader->GetImage();
lowSrcLinesLoaded = lowImage != nsnull?lowImage->GetDecodedY2():-1;
}
image = mImageLoader.GetImage();
imgSrcLinesLoaded = image != nsnull?image->GetDecodedY2():-1;
if (nsnull == image && nsnull == lowImage) {
// No image yet, or image load failed. Draw the alt-text and an icon
// indicating the status
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer &&
!mInitialLoadCompleted) {
DisplayAltFeedback(aPresContext, aRenderingContext,
mImageLoader.GetLoadImageFailed()
? NS_ICON_BROKEN_IMAGE
: NS_ICON_LOADING_IMAGE);
}
}
else {
mInitialLoadCompleted = PR_TRUE;
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
// Now render the image into our content area (the area inside the
// borders and padding)
nsRect inner;
GetInnerArea(aPresContext, inner);
if (mImageLoader.GetLoadImageFailed()) {
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
if (image != nsnull) {
inner.width = NSIntPixelsToTwips(image->GetWidth(), p2t);
inner.height = NSIntPixelsToTwips(image->GetHeight(), p2t);
} else if (lowImage != nsnull) {
inner.width = NSIntPixelsToTwips(lowImage->GetWidth(), p2t);
inner.height = NSIntPixelsToTwips(lowImage->GetHeight(), p2t);
}
}
if (image != nsnull && imgSrcLinesLoaded > 0) {
aRenderingContext.DrawImage(image, inner);
} else if (lowImage != nsnull && lowSrcLinesLoaded > 0) {
aRenderingContext.DrawImage(lowImage, inner);
}
}
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsRect inner;
GetInnerArea(aPresContext, inner);
PRBool clipState;
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.SetLineStyle(nsLineStyle_kDotted);
aRenderingContext.PushState();
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState(clipState);
}
#ifdef DEBUG
if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) &&
GetShowFrameBorders()) {
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsRect inner;
GetInnerArea(aPresContext, inner);
PRBool clipState;
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.PushState();
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState(clipState);
}
}
#endif
}
NS_IF_RELEASE(lowImage);
NS_IF_RELEASE(image);
}
return nsFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
}
nsImageMap*
nsImageFrame::GetImageMap(nsIPresContext* aPresContext)
{
if (nsnull == mImageMap) {
nsAutoString usemap;
mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::usemap, usemap);
if (0 == usemap.Length()) {
return nsnull;
}
// Strip out whitespace in the name for navigator compatability
// XXX NAV QUIRK
usemap.StripWhitespace();
nsIDocument* doc = nsnull;
mContent->GetDocument(doc);
if (nsnull == doc) {
return nsnull;
}
if (usemap.First() == '#') {
usemap.Cut(0, 1);
}
nsIHTMLDocument* hdoc;
nsresult rv = doc->QueryInterface(kIHTMLDocumentIID, (void**)&hdoc);
NS_RELEASE(doc);
if (NS_SUCCEEDED(rv)) {
nsIDOMHTMLMapElement* map;
rv = hdoc->GetImageMap(usemap, &map);
NS_RELEASE(hdoc);
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
mImageMap = new nsImageMap();
if (nsnull != mImageMap) {
NS_ADDREF(mImageMap);
mImageMap->Init(presShell, this, map);
}
NS_IF_RELEASE(map);
}
}
}
return mImageMap;
}
void
nsImageFrame::TriggerLink(nsIPresContext* aPresContext,
const nsString& aURLSpec,
const nsString& aTargetSpec,
PRBool aClick)
{
// We get here with server side image map
nsILinkHandler* handler = nsnull;
aPresContext->GetLinkHandler(&handler);
if (nsnull != handler) {
if (aClick) {
nsresult proceed = NS_OK;
// Check that this page is allowed to load this URI.
// Almost a copy of the similarly named method in nsGenericElement
nsresult rv;
NS_WITH_SERVICE(nsIScriptSecurityManager, securityManager,
NS_SCRIPTSECURITYMANAGER_PROGID, &rv);
nsCOMPtr<nsIPresShell> ps;
if (NS_SUCCEEDED(rv))
rv = aPresContext->GetShell(getter_AddRefs(ps));
nsCOMPtr<nsIDocument> doc;
if (NS_SUCCEEDED(rv) && ps)
rv = ps->GetDocument(getter_AddRefs(doc));
nsCOMPtr<nsIURI> baseURI;
if (NS_SUCCEEDED(rv) && doc)
baseURI = dont_AddRef(doc->GetDocumentURL());
nsCOMPtr<nsIURI> absURI;
if (NS_SUCCEEDED(rv))
rv = NS_NewURI(getter_AddRefs(absURI), aURLSpec, baseURI);
if (NS_SUCCEEDED(rv))
proceed = securityManager->CheckLoadURI(baseURI, absURI, PR_FALSE);
// Only pass off the click event if the script security manager
// says it's ok.
if (NS_SUCCEEDED(proceed))
handler->OnLinkClick(mContent, eLinkVerb_Replace, aURLSpec.GetUnicode(), aTargetSpec.GetUnicode());
}
else {
handler->OnOverLink(mContent, aURLSpec.GetUnicode(), aTargetSpec.GetUnicode());
}
NS_RELEASE(handler);
}
}
PRBool
nsImageFrame::IsServerImageMap()
{
nsAutoString ismap;
return NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::ismap, ismap);
}
PRIntn
nsImageFrame::GetSuppress()
{
nsAutoString s;
if (NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::suppress, s)) {
if (s.EqualsIgnoreCase("true")) {
return SUPPRESS;
} else if (s.EqualsIgnoreCase("false")) {
return DONT_SUPPRESS;
}
}
return DEFAULT_SUPPRESS;
}
//XXX the event come's in in view relative coords, but really should
//be in frame relative coords by the time it hits our frame.
// Translate an point that is relative to our view (or a containing
// view) into a localized pixel coordinate that is relative to the
// content area of this frame (inside the border+padding).
void
nsImageFrame::TranslateEventCoords(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsPoint& aResult)
{
nscoord x = aPoint.x;
nscoord y = aPoint.y;
// If we have a view then the event coordinates are already relative
// to this frame; otherwise we have to adjust the coordinates
// appropriately.
nsIView* view;
GetView(aPresContext, &view);
if (nsnull == view) {
nsPoint offset;
GetOffsetFromView(aPresContext, offset, &view);
if (nsnull != view) {
x -= offset.x;
y -= offset.y;
}
}
// Subtract out border and padding here so that the coordinates are
// now relative to the content area of this frame.
nsRect inner;
GetInnerArea(aPresContext, inner);
x -= inner.x;
y -= inner.y;
// Translate the coordinates from twips to pixels
float t2p;
aPresContext->GetTwipsToPixels(&t2p);
aResult.x = NSTwipsToIntPixels(x, t2p);
aResult.y = NSTwipsToIntPixels(y, t2p);
}
PRBool
nsImageFrame::GetAnchorHREF(nsString& aResult)
{
PRBool status = PR_FALSE;
aResult.Truncate();
// Walk up the content tree, looking for an nsIDOMAnchorElement
nsCOMPtr<nsIContent> content;
mContent->GetParent(*getter_AddRefs(content));
while (content) {
nsCOMPtr<nsIDOMHTMLAnchorElement> anchor(do_QueryInterface(content));
if (anchor) {
anchor->GetHref(aResult);
if (aResult.Length() > 0) {
status = PR_TRUE;
}
break;
}
nsCOMPtr<nsIContent> parent;
content->GetParent(*getter_AddRefs(parent));
content = parent;
}
return status;
}
NS_IMETHODIMP
nsImageFrame::GetContentForEvent(nsIPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent)
{
NS_ENSURE_ARG_POINTER(aContent);
nsImageMap* map;
map = GetImageMap(aPresContext);
if (nsnull != map) {
nsPoint p;
TranslateEventCoords(aPresContext, aEvent->point, p);
nsAutoString absURL, target, altText;
PRBool suppress;
PRBool inside = PR_FALSE;
nsCOMPtr<nsIContent> area;
inside = map->IsInside(p.x, p.y, getter_AddRefs(area),
absURL, target, altText,
&suppress);
if (inside && area) {
*aContent = area;
NS_ADDREF(*aContent);
return NS_OK;
}
}
return GetContent(aContent);
}
// XXX what should clicks on transparent pixels do?
NS_METHOD
nsImageFrame::HandleEvent(nsIPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
NS_ENSURE_ARG_POINTER(aEventStatus);
nsImageMap* map;
switch (aEvent->message) {
case NS_MOUSE_LEFT_BUTTON_UP:
case NS_MOUSE_MOVE:
{
map = GetImageMap(aPresContext);
PRBool isServerMap = IsServerImageMap();
if ((nsnull != map) || isServerMap) {
nsPoint p;
TranslateEventCoords(aPresContext, aEvent->point, p);
nsAutoString absURL, target, altText;
PRBool suppress;
PRBool inside = PR_FALSE;
// Even though client-side image map triggering happens
// through content, we need to make sure we're not inside
// (in case we deal with a case of both client-side and
// sever-side on the same image - it happens!)
if (nsnull != map) {
nsCOMPtr<nsIContent> area;
inside = map->IsInside(p.x, p.y, getter_AddRefs(area),
absURL, target, altText,
&suppress);
}
if (!inside && isServerMap) {
suppress = GetSuppress();
nsIURI* baseURL = nsnull;
nsIHTMLContent* htmlContent;
if (NS_SUCCEEDED(mContent->QueryInterface(kIHTMLContentIID,
(void**)&htmlContent))) {
htmlContent->GetBaseURL(baseURL);
NS_RELEASE(htmlContent);
}
else {
nsIDocument* doc;
if (NS_SUCCEEDED(mContent->GetDocument(doc))) {
doc->GetBaseURL(baseURL);
NS_RELEASE(doc);
}
}
// Server side image maps use the href in a containing anchor
// element to provide the basis for the destination url.
nsAutoString src;
if (GetAnchorHREF(src)) {
NS_MakeAbsoluteURI(absURL, src, baseURL);
NS_IF_RELEASE(baseURL);
// XXX if the mouse is over/clicked in the border/padding area
// we should probably just pretend nothing happened. Nav4
// keeps the x,y coordinates positive as we do; IE doesn't
// bother. Both of them send the click through even when the
// mouse is over the border.
if (p.x < 0) p.x = 0;
if (p.y < 0) p.y = 0;
char cbuf[50];
PR_snprintf(cbuf, sizeof(cbuf), "?%d,%d", p.x, p.y);
absURL.AppendWithConversion(cbuf);
PRBool clicked = PR_FALSE;
if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
*aEventStatus = nsEventStatus_eConsumeDoDefault;
clicked = PR_TRUE;
}
TriggerLink(aPresContext, absURL, target, clicked);
}
}
}
break;
}
default:
break;
}
return nsLeafFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
//XXX This will need to be rewritten once we have content for areas
NS_METHOD
nsImageFrame::GetCursor(nsIPresContext* aPresContext,
nsPoint& aPoint,
PRInt32& aCursor)
{
nsImageMap* map = GetImageMap(aPresContext);
if (nsnull != map) {
nsPoint p;
TranslateEventCoords(aPresContext, aPoint, p);
aCursor = NS_STYLE_CURSOR_DEFAULT;
if (map->IsInside(p.x, p.y)) {
// Use style defined cursor if one is provided, otherwise when
// the cursor style is "auto" we use the pointer cursor.
const nsStyleColor* styleColor;
GetStyleData(eStyleStruct_Color, (const nsStyleStruct*&)styleColor);
aCursor = styleColor->mCursor;
if (NS_STYLE_CURSOR_AUTO == aCursor) {
aCursor = NS_STYLE_CURSOR_POINTER;
}
}
return NS_OK;
}
return nsFrame::GetCursor(aPresContext, aPoint, aCursor);
}
NS_IMETHODIMP
nsImageFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint)
{
nsresult rv = nsLeafFrame::AttributeChanged(aPresContext, aChild,
aNameSpaceID, aAttribute, aHint);
if (NS_OK != rv) {
return rv;
}
if (nsHTMLAtoms::src == aAttribute) {
nsAutoString oldSRC, newSRC;
mImageLoader.GetURLSpec(oldSRC);
aChild->GetAttribute(kNameSpaceID_None, nsHTMLAtoms::src, newSRC);
if (!oldSRC.Equals(newSRC)) {
#ifdef NOISY_IMAGE_LOADING
ListTag(stdout);
printf(": new image source; old='");
fputs(oldSRC, stdout);
printf("' new='");
fputs(newSRC, stdout);
printf("'\n");
#endif
if (mImageLoader.IsImageSizeKnown()) {
mImageLoader.UpdateURLSpec(aPresContext, newSRC);
PRUint32 loadStatus = mImageLoader.GetLoadStatus();
if (loadStatus & NS_IMAGE_LOAD_STATUS_IMAGE_READY) {
// Trigger a paint now because image-loader won't if the
// image is already loaded and ready to go.
Invalidate(aPresContext, nsRect(0, 0, mRect.width, mRect.height), PR_FALSE);
}
}
else {
// Stop the earlier image load
mImageLoader.StopLoadImage(aPresContext);
// Update the URL and start the new image load
mImageLoader.UpdateURLSpec(aPresContext, newSRC);
}
}
}
else if (nsHTMLAtoms::width == aAttribute || nsHTMLAtoms::height == aAttribute)
{ // XXX: could check for new width == old width, and make that a no-op
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
mState |= NS_FRAME_IS_DIRTY;
mParent->ReflowDirtyChild(presShell, (nsIFrame*) this);
}
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::imageFrame;
NS_ADDREF(*aType);
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::GetIntrinsicImageSize(nsSize& aSize)
{
mImageLoader.GetIntrinsicSize(aSize);
return NS_OK;
}
NS_IMETHODIMP
nsImageFrame::IsImageComplete(PRBool* aComplete)
{
NS_ENSURE_ARG_POINTER(aComplete);
*aComplete = ((mImageLoader.GetLoadStatus() & NS_IMAGE_LOAD_STATUS_IMAGE_READY) != 0);
return NS_OK;
}
#ifdef DEBUG
NS_IMETHODIMP
nsImageFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
PRUint32 sum;
mImageLoader.SizeOf(aHandler, &sum);
sum += sizeof(*this) - sizeof(mImageLoader);
if (mImageMap) {
PRBool recorded;
aHandler->RecordObject((void*) mImageMap, &recorded);
if (!recorded) {
PRUint32 mapSize;
mImageMap->SizeOf(aHandler, &mapSize);
aHandler->AddSize(nsLayoutAtoms::imageMap, mapSize);
}
}
*aResult = sum;
return NS_OK;
}
#endif
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