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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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsHTMLParts.h"
#include "nsHTMLImage.h"
#include "nsString.h"
#include "nsLeafFrame.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 "nsIImageMap.h"
#include "nsILinkHandler.h"
#include "nsIURL.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLContainerFrame.h"
#include "prprf.h"
#include "nsISizeOfHandler.h"
#include "nsIFontMetrics.h"
#include "nsCSSRendering.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsIDeviceContext.h"
#define BROKEN_IMAGE_URL "resource:/res/html/broken-image.gif"
#define XP_IS_SPACE(_ch) \
(((_ch) == ' ') || ((_ch) == '\t') || ((_ch) == '\n'))
static NS_DEFINE_IID(kIHTMLDocumentIID, NS_IHTMLDOCUMENT_IID);
#define ImageFrameSuper nsLeafFrame
class ImageFrame : public ImageFrameSuper {
public:
ImageFrame(nsIContent* aContent, nsIFrame* aParentFrame);
NS_IMETHOD DeleteFrame(nsIPresContext& aPresContext);
NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const;
NS_IMETHOD Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect);
NS_METHOD HandleEvent(nsIPresContext& aPresContext,
nsGUIEvent* aEvent,
nsEventStatus& aEventStatus);
NS_IMETHOD GetCursorAndContentAt(nsIPresContext& aPresContext,
const nsPoint& aPoint,
nsIFrame** aFrame,
nsIContent** aContent,
PRInt32& aCursor);
NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsIAtom* aAttribute,
PRInt32 aHint);
protected:
virtual ~ImageFrame();
void SizeOfWithoutThis(nsISizeOfHandler* aHandler) const;
virtual void GetDesiredSize(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize);
nsIImageMap* GetImageMap();
nsHTMLImageLoader mImageLoader;
nsIImageMap* mImageMap;
PRBool mSizeFrozen;
void TriggerLink(nsIPresContext& aPresContext,
const nsString& aURLSpec,
const nsString& aTargetSpec,
PRBool aClick);
PRBool IsServerImageMap();
PRIntn GetSuppress();
nscoord MeasureString(const PRUnichar* aString,
PRInt32 aLength,
nscoord aMaxWidth,
PRUint32& aMaxFit,
nsIRenderingContext& aContext);
void DisplayAltText(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsString& aAltText,
const nsRect& aRect);
void DisplayAltFeedback(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
PRInt32 aIconId);
};
// 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)
//----------------------------------------------------------------------
nsHTMLImageLoader::nsHTMLImageLoader()
{
mImageLoader = nsnull;
mLoadImageFailed = PR_FALSE;
mLoadBrokenImageFailed = PR_FALSE;
mURLSpec = nsnull;
mBaseHREF = nsnull;
}
nsHTMLImageLoader::~nsHTMLImageLoader()
{
NS_IF_RELEASE(mImageLoader);
if (nsnull != mURLSpec) {
delete mURLSpec;
}
if (nsnull != mBaseHREF) {
delete mBaseHREF;
}
}
void
nsHTMLImageLoader::SizeOf(nsISizeOfHandler* aHandler) const
{
aHandler->Add(sizeof(*this));
if (!aHandler->HaveSeen(mURLSpec)) {
mURLSpec->SizeOf(aHandler);
}
if (!aHandler->HaveSeen(mImageLoader)) {
mImageLoader->SizeOf(aHandler);
}
}
nsIImage*
nsHTMLImageLoader::GetImage()
{
nsIImage* image = nsnull;
if (nsnull != mImageLoader) {
mImageLoader->GetImage(image);
}
return image;
}
nsresult
nsHTMLImageLoader::SetURL(const nsString& aURLSpec)
{
if (nsnull != mURLSpec) {
delete mURLSpec;
}
mURLSpec = new nsString(aURLSpec);
if (nsnull == mURLSpec) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsresult
nsHTMLImageLoader::SetBaseHREF(const nsString& aBaseHREF)
{
if (nsnull != mBaseHREF) {
delete mBaseHREF;
}
mBaseHREF = new nsString(aBaseHREF);
if (nsnull == mBaseHREF) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsresult
nsHTMLImageLoader::StartLoadImage(nsIPresContext* aPresContext,
nsIFrame* aForFrame,
nsFrameImageLoaderCB aCallBack,
PRBool aNeedSizeUpdate,
PRIntn& aLoadStatus)
{
aLoadStatus = NS_IMAGE_LOAD_STATUS_NONE;
// Get absolute url the first time through
nsresult rv;
nsAutoString src;
if (mLoadImageFailed || (nsnull == mURLSpec)) {
src.Append(BROKEN_IMAGE_URL);
} else {
nsAutoString baseURL;
if (nsnull != mBaseHREF) {
baseURL = *mBaseHREF;
}
// Get documentURL
nsIPresShell* shell;
shell = aPresContext->GetShell();
nsIDocument* doc = shell->GetDocument();
nsIURL* docURL = doc->GetDocumentURL();
// Create an absolute URL
nsresult rv = NS_MakeAbsoluteURL(docURL, baseURL, *mURLSpec, src);
// Release references
NS_RELEASE(shell);
NS_RELEASE(docURL);
NS_RELEASE(doc);
if (NS_OK != rv) {
return rv;
}
}
if (nsnull == mImageLoader) {
// Start image loading. Note that we don't specify a background color
// so transparent images are always rendered using a transparency mask
rv = aPresContext->StartLoadImage(src, nsnull, aForFrame, aCallBack,
aNeedSizeUpdate, mImageLoader);
if (NS_OK != rv) {
return rv;
}
}
// Examine current image load status
mImageLoader->GetImageLoadStatus(aLoadStatus);
if (0 != (aLoadStatus & NS_IMAGE_LOAD_STATUS_ERROR)) {
NS_RELEASE(mImageLoader);
if (mLoadImageFailed) {
// We are doomed. Loading the broken image has just failed.
mLoadBrokenImageFailed = PR_TRUE;
}
else {
#ifdef _WIN32
// Display broken icon along with alt-text
mLoadImageFailed = PR_TRUE;
#else
// Try again, this time using the broke-image url
mLoadImageFailed = PR_TRUE;
return StartLoadImage(aPresContext, aForFrame, nsnull,
aNeedSizeUpdate, aLoadStatus);
#endif
}
}
return NS_OK;
}
void
nsHTMLImageLoader::GetDesiredSize(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsIFrame* aTargetFrame,
nsFrameImageLoaderCB aCallBack,
nsHTMLReflowMetrics& aDesiredSize)
{
// Start the image loading
PRIntn loadStatus;
StartLoadImage(aPresContext, aTargetFrame, aCallBack,
!aReflowState.HaveConstrainedWidthAndHeight(),
loadStatus);
// Choose reflow size
if (aReflowState.HaveConstrainedWidth() ||
aReflowState.HaveConstrainedHeight()) {
if (aReflowState.HaveConstrainedWidthAndHeight()) {
// The image is fully constrained. Use the constraints directly.
aDesiredSize.width = aReflowState.minWidth;
aDesiredSize.height = aReflowState.minHeight;
}
else {
// The image is partially constrained. Preserve aspect ratio of
// image with unbound dimension.
if ((0 == (loadStatus & NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE)) ||
(nsnull == mImageLoader)) {
// Provide a dummy size for now; later on when the image size
// shows up we will reflow to the new size.
aDesiredSize.width = 1;
aDesiredSize.height = 1;
}
else {
float p2t = aPresContext->GetPixelsToTwips();
nsSize imageSize;
mImageLoader->GetSize(imageSize);
float imageWidth = imageSize.width * p2t;
float imageHeight = imageSize.height * p2t;
if (0.0f != imageHeight) {
if (aReflowState.HaveConstrainedWidth()) {
// We have a width, and an auto height. Compute height
// from width.
aDesiredSize.width = aReflowState.minWidth;
aDesiredSize.height = (nscoord)
NSToIntRound(aReflowState.minWidth * imageHeight / imageWidth);
}
else {
// We have a height and an auto width. Compute width from
// height.
aDesiredSize.height = aReflowState.minHeight;
aDesiredSize.width = (nscoord)
NSToIntRound(aReflowState.minHeight * imageWidth / imageHeight);
}
}
else {
// Screwy image
aDesiredSize.width = 1;
aDesiredSize.height = 1;
}
}
}
}
else {
// The image is unconstrained
if ((0 == (loadStatus & NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE)) ||
(nsnull == mImageLoader)) {
// Provide a dummy size for now; later on when the image size
// shows up we will reflow to the new size.
aDesiredSize.width = 1;
aDesiredSize.height = 1;
} else {
float p2t = aPresContext->GetPixelsToTwips();
nsSize imageSize;
mImageLoader->GetSize(imageSize);
aDesiredSize.width = NSIntPixelsToTwips(imageSize.width, p2t);
aDesiredSize.height = NSIntPixelsToTwips(imageSize.height, p2t);
}
}
}
//----------------------------------------------------------------------
nsresult
NS_NewImageFrame(nsIContent* aContent,
nsIFrame* aParentFrame,
nsIFrame*& aResult)
{
ImageFrame* frame = new ImageFrame(aContent, aParentFrame);
if (nsnull == frame) {
return NS_ERROR_OUT_OF_MEMORY;
}
aResult = frame;
return NS_OK;
}
ImageFrame::ImageFrame(nsIContent* aContent, nsIFrame* aParentFrame)
: nsLeafFrame(aContent, aParentFrame)
{
}
ImageFrame::~ImageFrame()
{
}
NS_METHOD
ImageFrame::DeleteFrame(nsIPresContext& aPresContext)
{
NS_IF_RELEASE(mImageMap);
// Release image loader first so that it's refcnt can go to zero
mImageLoader.DestroyLoader();
return nsLeafFrame::DeleteFrame(aPresContext);
}
NS_IMETHODIMP
ImageFrame::SizeOf(nsISizeOfHandler* aHandler) const
{
aHandler->Add(sizeof(*this));
ImageFrame::SizeOfWithoutThis(aHandler);
return NS_OK;
}
void
ImageFrame::SizeOfWithoutThis(nsISizeOfHandler* aHandler) const
{
ImageFrameSuper::SizeOfWithoutThis(aHandler);
mImageLoader.SizeOf(aHandler);
if (!aHandler->HaveSeen(mImageMap)) {
mImageMap->SizeOf(aHandler);
}
}
static nsresult
UpdateImageFrame(nsIPresContext& aPresContext, nsIFrame* aFrame,
PRIntn aStatus)
{
if (NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE & aStatus) {
// Now that the size is available, trigger a content-changed reflow
nsIContent* content = nsnull;
aFrame->GetContent(content);
if (nsnull != content) {
nsIDocument* document = nsnull;
content->GetDocument(document);
if (nsnull != document) {
document->ContentChanged(content, nsnull);
NS_RELEASE(document);
}
NS_RELEASE(content);
}
}
return NS_OK;
}
void
ImageFrame::GetDesiredSize(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize)
{
if (mSizeFrozen) {
aDesiredSize.width = mRect.width;
aDesiredSize.height = mRect.height;
}
else {
// XXX Don't create a view, because we want whatever is below the image
// to show through while the image is loading; Likewise for transparent
// images and broken images
//
// What we really want to do is to create a view, and indicate that the
// view has a transparent content area. Do this while it's loading,
// and then when it's fully loaded mark the view as opaque if the
// image is opaque.
//
// We can't use that approach yet, because currently the compositor doesn't
// support transparent views...
#if 0
nsHTMLContainerFrame::CreateViewForFrame(*aPresContext, this, mStyleContext, PR_TRUE);
#endif
// Setup url before starting the image load
nsAutoString src, base;
if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttribute("SRC", src)) {
mImageLoader.SetURL(src);
if (NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttribute(NS_HTML_BASE_HREF, base)) {
mImageLoader.SetBaseHREF(base);
}
}
mImageLoader.GetDesiredSize(aPresContext, aReflowState,
this, UpdateImageFrame,
aDesiredSize);
}
}
// 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
nscoord
ImageFrame::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;
}
}
return totalWidth;
}
// 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
ImageFrame::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();
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
nscoord width = MeasureString(str, strLen, aRect.width, maxFit, aRenderingContext);
// Display the text
aRenderingContext.DrawString(str, maxFit, aRect.x, y, 0);
// 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
ImageFrame::DisplayAltFeedback(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
PRInt32 aIconId)
{
// Display a recessed one pixel border in the inner area
nsRect inner;
GetInnerArea(&aPresContext, inner);
float p2t = aPresContext.GetPixelsToTwips();
nsRecessedBorder recessedBorder(NSIntPixelsToTwips(1, p2t));
nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this, inner,
inner, recessedBorder, 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
aRenderingContext.PushState();
aRenderingContext.SetClipRect(inner, nsClipCombine_kIntersect);
#ifdef _WIN32
// Display the icon
nsIDeviceContext* dc = aRenderingContext.GetDeviceContext();
nsIImage* icon;
if (NS_SUCCEEDED(dc->LoadIconImage(aIconId, 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);
#endif
// If there's still room, display the alt-text
if (!inner.IsEmpty()) {
nsAutoString altText;
if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttribute("ALT", altText)) {
DisplayAltText(aPresContext, aRenderingContext, altText, inner);
}
}
aRenderingContext.PopState();
}
NS_METHOD
ImageFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
if ((0 == mRect.width) || (0 == mRect.height)) {
// Do not render when given a zero area. This avoids some useless
// scaling work while we wait for our image dimensions to arrive
// asynchronously.
return NS_OK;
}
const nsStyleDisplay* disp =
(const nsStyleDisplay*)mStyleContext->GetStyleData(eStyleStruct_Display);
if (disp->mVisible) {
// First paint background and borders
nsLeafFrame::Paint(aPresContext, aRenderingContext, aDirtyRect);
nsIImage* image = mImageLoader.GetImage();
if (nsnull == image) {
// No image yet, or image load failed. Draw the alt-text and an icon
// indicating the status
DisplayAltFeedback(aPresContext, aRenderingContext,
mImageLoader.GetLoadImageFailed() ? NS_ICON_BROKEN_IMAGE :
NS_ICON_LOADING_IMAGE);
return NS_OK;
}
// Now render the image into our inner area (the area without the
// borders and padding)
nsRect inner;
GetInnerArea(&aPresContext, inner);
if (mImageLoader.GetLoadImageFailed()) {
float p2t = aPresContext.GetPixelsToTwips();
inner.width = NSIntPixelsToTwips(image->GetWidth(), p2t);
inner.height = NSIntPixelsToTwips(image->GetHeight(), p2t);
}
aRenderingContext.DrawImage(image, inner);
if (GetShowFrameBorders()) {
nsIImageMap* map = GetImageMap();
if (nsnull != map) {
aRenderingContext.SetColor(NS_RGB(0, 0, 0));
aRenderingContext.PushState();
aRenderingContext.Translate(inner.x, inner.y);
map->Draw(aPresContext, aRenderingContext);
aRenderingContext.PopState();
}
}
}
return NS_OK;
}
nsIImageMap*
ImageFrame::GetImageMap()
{
if (nsnull == mImageMap) {
nsAutoString usemap;
mContent->GetAttribute("usemap", usemap);
if (0 == usemap.Length()) {
return nsnull;
}
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_OK == rv) {
nsIImageMap* map;
rv = hdoc->GetImageMap(usemap, &map);
NS_RELEASE(hdoc);
if (NS_OK == rv) {
mImageMap = map;
}
}
}
NS_IF_ADDREF(mImageMap);
return mImageMap;
}
void
ImageFrame::TriggerLink(nsIPresContext& aPresContext,
const nsString& aURLSpec,
const nsString& aTargetSpec,
PRBool aClick)
{
nsILinkHandler* handler = nsnull;
aPresContext.GetLinkHandler(&handler);
if (nsnull != handler) {
if (aClick) {
handler->OnLinkClick(this, aURLSpec, aTargetSpec);
}
else {
handler->OnOverLink(this, aURLSpec, aTargetSpec);
}
}
}
PRBool
ImageFrame::IsServerImageMap()
{
nsAutoString ismap;
return NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttribute("ismap", ismap);
}
PRIntn
ImageFrame::GetSuppress()
{
nsAutoString s;
if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttribute("suppress", s)) {
if (s.EqualsIgnoreCase("true")) {
return SUPPRESS;
} else if (s.EqualsIgnoreCase("false")) {
return DONT_SUPPRESS;
}
}
return DEFAULT_SUPPRESS;
}
// XXX what should clicks on transparent pixels do?
NS_METHOD
ImageFrame::HandleEvent(nsIPresContext& aPresContext,
nsGUIEvent* aEvent,
nsEventStatus& aEventStatus)
{
nsIImageMap* map;
aEventStatus = nsEventStatus_eIgnore;
switch (aEvent->message) {
case NS_MOUSE_LEFT_BUTTON_UP:
case NS_MOUSE_MOVE:
map = GetImageMap();
if ((nsnull != map) || IsServerImageMap()) {
nsIURL* docURL = nsnull;
nsIDocument* doc = nsnull;
mContent->GetDocument(doc);
if (nsnull != doc) {
docURL = doc->GetDocumentURL();
NS_RELEASE(doc);
}
// Ask map if the x,y coordinates are in a clickable area
float t2p = aPresContext.GetTwipsToPixels();
nsAutoString absURL, target, altText;
PRBool suppress;
if (nsnull != map) {
// Subtract out border and padding here so that we are looking
// at the right coordinates. Hit detection against area tags
// is done after the mouse wanders over the image, not over
// the image's borders.
nsRect inner;
GetInnerArea(&aPresContext, inner);
PRInt32 x = NSTwipsToIntPixels((aEvent->point.x - inner.x), t2p);
PRInt32 y = NSTwipsToIntPixels((aEvent->point.y - inner.y), t2p);
nsresult r = map->IsInside(x, y, docURL, absURL, target, altText,
&suppress);
NS_IF_RELEASE(docURL);
NS_RELEASE(map);
if (NS_OK == r) {
// We hit a clickable area. Time to go somewhere...
PRBool clicked = PR_FALSE;
if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
aEventStatus = nsEventStatus_eConsumeNoDefault;
clicked = PR_TRUE;
}
TriggerLink(aPresContext, absURL, target, clicked);
}
}
else {
suppress = GetSuppress();
nsAutoString baseURL;
mContent->GetAttribute(NS_HTML_BASE_HREF, baseURL);
nsAutoString src;
mContent->GetAttribute("src", src);
NS_MakeAbsoluteURL(docURL, baseURL, src, absURL);
// Note: We don't subtract out the border/padding here to remain
// compatible with navigator. [ick]
PRInt32 x = NSTwipsToIntPixels(aEvent->point.x, t2p);
PRInt32 y = NSTwipsToIntPixels(aEvent->point.y, t2p);
char cbuf[50];
PR_snprintf(cbuf, sizeof(cbuf), "?%d,%d", x, y);
absURL.Append(cbuf);
PRBool clicked = PR_FALSE;
if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
aEventStatus = nsEventStatus_eConsumeNoDefault;
clicked = PR_TRUE;
}
TriggerLink(aPresContext, absURL, target, clicked);
}
break;
}
// FALL THROUGH
default:
// Let default event handler deal with it
return nsLeafFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
return NS_OK;
}
NS_METHOD
ImageFrame::GetCursorAndContentAt(nsIPresContext& aPresContext,
const nsPoint& aPoint,
nsIFrame** aFrame,
nsIContent** aContent,
PRInt32& aCursor)
{
// The default cursor is to have no cursor
aCursor = NS_STYLE_CURSOR_INHERIT;
*aContent = mContent;
const nsStyleColor* styleColor = (const nsStyleColor*)
mStyleContext->GetStyleData(eStyleStruct_Color);
if (styleColor->mCursor != NS_STYLE_CURSOR_INHERIT) {
// If we have a particular cursor, use it
*aFrame = this;
aCursor = (PRInt32) styleColor->mCursor;
}
nsIImageMap* map = GetImageMap();
if (nsnull != map) {
nsRect inner;
GetInnerArea(&aPresContext, inner);
aCursor = NS_STYLE_CURSOR_DEFAULT;
float t2p = aPresContext.GetTwipsToPixels();
PRInt32 x = NSTwipsToIntPixels((aPoint.x - inner.x), t2p);
PRInt32 y = NSTwipsToIntPixels((aPoint.y - inner.y), t2p);
if (NS_OK == map->IsInside(x, y)) {
aCursor = NS_STYLE_CURSOR_HAND;
}
NS_RELEASE(map);
}
return NS_OK;
}
NS_IMETHODIMP
ImageFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsIAtom* aAttribute,
PRInt32 aHint)
{
nsresult rv = nsLeafFrame::AttributeChanged(aPresContext, aChild,
aAttribute, aHint);
if (NS_OK != rv) {
return rv;
}
if (nsHTMLAtoms::src == aAttribute) {
nsAutoString oldSRC;
mImageLoader.GetURL(oldSRC);
nsAutoString newSRC;
aChild->GetAttribute("src", newSRC);
if (!oldSRC.Equals(newSRC)) {
mSizeFrozen = PR_TRUE;
#ifdef NS_DEBUG
char oldcbuf[100], newcbuf[100];
oldSRC.ToCString(oldcbuf, sizeof(oldcbuf));
newSRC.ToCString(newcbuf, sizeof(newcbuf));
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("ImageFrame::AttributeChanged: new image source; old='%s' new='%s'",
oldcbuf, newcbuf));
#endif
// Get rid of old image loader and start a new image load going
mImageLoader.DestroyLoader();
// Fire up a new image load request
PRIntn loadStatus;
mImageLoader.SetURL(newSRC);
mImageLoader.StartLoadImage(aPresContext, this, nsnull,
PR_FALSE, loadStatus);
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("ImageFrame::AttributeChanged: loadImage status=%x",
loadStatus));
// If the image is already ready then we need to trigger a
// redraw because the image loader won't.
if (loadStatus & NS_IMAGE_LOAD_STATUS_IMAGE_READY) {
// XXX Stuff this into a method on nsIPresShell/Context
nsRect bounds;
nsPoint offset;
nsIView* view;
GetOffsetFromView(offset, view);
nsIViewManager* vm;
view->GetViewManager(vm);
bounds.x = offset.x;
bounds.y = offset.y;
bounds.width = mRect.width;
bounds.height = mRect.height;
vm->UpdateView(view, bounds, 0);
NS_RELEASE(vm);
}
}
}
return NS_OK;
}
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