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gecko-dev/extensions/xmlterm/base/mozXMLTermStream.cpp

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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "MPL"); you may not use this file
* except in compliance with the MPL. You may obtain a copy of
* the MPL at http://www.mozilla.org/MPL/
*
* Software distributed under the MPL is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the MPL for the specific language governing
* rights and limitations under the MPL.
*
* The Original Code is XMLterm.
*
* The Initial Developer of the Original Code is Ramalingam Saravanan.
* Portions created by Ramalingam Saravanan <svn@xmlterm.org> are
* Copyright (C) 1999 Ramalingam Saravanan. All Rights Reserved.
*
* Contributor(s):
*/
// mozXMLTermStream.cpp: implementation of mozIXMLTermStream
// to display HTML/XML streams as documents
#include "nscore.h"
#include "prlog.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "plstr.h"
#include "nsMemory.h"
#include "nsIServiceManager.h"
#include "nsIContentViewer.h"
#include "nsIDocumentViewer.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIViewManager.h"
#include "nsIScrollableView.h"
#include "nsIDeviceContext.h"
#include "nsIFrame.h"
#include "nsIScriptContextOwner.h"
#include "nsIScriptGlobalObject.h"
#include "nsICategoryManager.h"
#include "nsXPCOMCID.h"
#include "mozXMLT.h"
#include "mozXMLTermUtils.h"
#include "mozXMLTermStream.h"
static NS_DEFINE_CID(kSimpleURICID, NS_SIMPLEURI_CID);
/////////////////////////////////////////////////////////////////////////
// mozXMLTermStream implementation
/////////////////////////////////////////////////////////////////////////
NS_IMPL_THREADSAFE_ISUPPORTS2(mozXMLTermStream,
mozIXMLTermStream,
nsIInputStream)
mozXMLTermStream::mozXMLTermStream() :
mUTF8Buffer(""),
mUTF8Offset(0),
mMaxResizeHeight(0),
mDOMWindow( nsnull ),
#ifdef NO_WORKAROUND
mDOMIFrameElement( nsnull ),
mContext( nsnull ),
mLoadGroup( nsnull ),
mChannel( nsnull ),
mStreamListener( nsnull )
#else // !NO_WORKAROUND
mDOMHTMLDocument( nsnull )
#endif // !NO_WORKAROUND
{
}
mozXMLTermStream::~mozXMLTermStream()
{
}
// mozIXMLTermStream interface
/** Open stream in specified frame, or in current frame if frameName is null
* @param aDOMWindow parent window
* @param frameName name of child frame in which to display stream, or null
* to display in parent window
* @param contentURL URL of stream content
* @param contentType MIME type of stream content
* @param maxResizeHeight maximum resize height (0=> do not resize)
* @return NS_OK on success
*/
NS_IMETHODIMP mozXMLTermStream::Open(nsIDOMWindowInternal* aDOMWindow,
const char* frameName,
const char* contentURL,
const char* contentType,
PRInt32 maxResizeHeight)
{
nsresult result;
XMLT_LOG(mozXMLTermStream::Open,20,("contentURL=%s, contentType=%s\n",
contentURL, contentType));
mMaxResizeHeight = maxResizeHeight;
if (frameName && *frameName) {
// Open stream in named subframe of current frame
XMLT_LOG(mozXMLTermStream::Open,22,("frameName=%s\n", frameName));
nsAutoString innerFrameName; innerFrameName.AssignWithConversion(frameName);
// Get DOM IFRAME element
nsCOMPtr<nsIDOMDocument> domDoc;
result = aDOMWindow->GetDocument(getter_AddRefs(domDoc));
if (NS_FAILED(result) || !domDoc)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMHTMLDocument> domHTMLDoc = do_QueryInterface(domDoc);
if (!domHTMLDoc)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMNodeList> nodeList;
result = domHTMLDoc->GetElementsByName(innerFrameName,
getter_AddRefs(nodeList));
if (NS_FAILED(result) || !nodeList)
return NS_ERROR_FAILURE;
PRUint32 count;
nodeList->GetLength(&count);
PR_ASSERT(count==1);
nsCOMPtr<nsIDOMNode> domNode;
result = nodeList->Item(0, getter_AddRefs(domNode));
if (NS_FAILED(result) || !domNode)
return NS_ERROR_FAILURE;
mDOMIFrameElement = do_QueryInterface(domNode);
if (!mDOMIFrameElement)
return NS_ERROR_FAILURE;
// Ensure that it is indeed an IFRAME element
nsAutoString tagName;
result = mDOMIFrameElement->GetTagName(tagName);
if (NS_FAILED(result))
return NS_ERROR_FAILURE;
if (!tagName.EqualsIgnoreCase("iframe"))
return NS_ERROR_FAILURE;
if (mMaxResizeHeight > 0) {
// Set initial IFRAME size to be as wide as the window, but very short
nsAutoString attWidth(NS_LITERAL_STRING("width"));
nsAutoString valWidth(NS_LITERAL_STRING("100%"));
mDOMIFrameElement->SetAttribute(attWidth,valWidth);
nsAutoString attHeight(NS_LITERAL_STRING("height"));
nsAutoString valHeight(NS_LITERAL_STRING("10"));
mDOMIFrameElement->SetAttribute(attHeight,valHeight);
}
// Get inner DOM window by looking up the frames list
nsCOMPtr<nsIDOMWindowInternal> innerDOMWindow;
result = mozXMLTermUtils::GetInnerDOMWindow(aDOMWindow, innerFrameName,
getter_AddRefs(innerDOMWindow));
if (NS_FAILED(result) || !innerDOMWindow)
return NS_ERROR_FAILURE;
mDOMWindow = innerDOMWindow;
} else {
// Open stream in current frame
mDOMIFrameElement = nsnull;
mDOMWindow = aDOMWindow;
}
// Get docshell for DOM window
nsCOMPtr<nsIDocShell> docShell;
result = mozXMLTermUtils::ConvertDOMWindowToDocShell(mDOMWindow,
getter_AddRefs(docShell));
if (NS_FAILED(result) || !docShell)
return NS_ERROR_FAILURE;
#ifdef NO_WORKAROUND
XMLT_WARNING("mozXMLTermStream::Open, NO_WORKAROUND, url=%s\n", contentURL);
nsCOMPtr<nsIInputStream> inputStream = this;
// Create a simple URI
nsCOMPtr<nsIURI> uri = do_CreateInstance(kSimpleURICID, &result);
if (NS_FAILED(result))
return result;
result = uri->SetSpec(nsDependentCString(contentURL));
if (NS_FAILED(result))
return result;
// Create a new load group
result = NS_NewLoadGroup(getter_AddRefs(mLoadGroup), nsnull);
if (NS_FAILED(result))
return result;
// Create an input stream channel
result = NS_NewInputStreamChannel(getter_AddRefs(mChannel),
uri,
inputStream,
nsDependentCString(contentType),
EmptyCString());
if (NS_FAILED(result))
return result;
// Set channel's load group
result = mChannel->SetLoadGroup(mLoadGroup);
if (NS_FAILED(result))
return result;
// Create document loader for specified command and content type
nsCOMPtr<nsICategoryManager> catMan(do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &result));
if (NS_FAILED(result))
return result;
nsXPIDLCString contractID;
result = catMan->GetCategoryEntry("Gecko-Content-Viewers", contentType,
getter_Copies(contractID));
if (NS_FAILED(result))
return result;
nsCOMPtr<nsIDocumentLoaderFactory> docLoaderFactory;
docLoaderFactory = do_GetService(contractID.get(), &result);
if (NS_FAILED(result))
return result;
nsCOMPtr<nsIContentViewerContainer> contViewContainer =
do_QueryInterface(docShell);
nsCOMPtr<nsIContentViewer> contentViewer;
result = docLoaderFactory->CreateInstance("view",
mChannel,
mLoadGroup,
contentType,
contViewContainer,
nsnull,
getter_AddRefs(mStreamListener),
getter_AddRefs(contentViewer) );
if (NS_FAILED(result))
return result;
// Set container for content view
result = contentViewer->SetContainer(contViewContainer);
if (NS_FAILED(result))
return result;
// Embed contentViewer in containing docShell
result = contViewContainer->Embed(contentViewer, "view", nsnull);
if (NS_FAILED(result))
return result;
// Start request
result = mStreamListener->OnStartRequest(mChannel, mContext);
if (NS_FAILED(result))
return result;
#else // !NO_WORKAROUND
XMLT_WARNING("mozXMLTermStream::Open, WORKAROUND\n");
nsCOMPtr<nsIDOMDocument> innerDOMDoc;
result = mDOMWindow->GetDocument(getter_AddRefs(innerDOMDoc));
XMLT_WARNING("mozXMLTermStream::Open,check1, 0x%x, 0x%x\n",
result, (int) innerDOMDoc.get());
if (NS_FAILED(result) || !innerDOMDoc)
return NS_ERROR_FAILURE;
mDOMHTMLDocument = do_QueryInterface(innerDOMDoc);
XMLT_WARNING("mozXMLTermStream::Open,check2, 0x%x\n", result);
if (!mDOMHTMLDocument)
return NS_ERROR_FAILURE;
result = mDOMHTMLDocument->Open();
XMLT_WARNING("mozXMLTermStream::Open,check3, 0x%x\n", result);
if (NS_FAILED(result))
return result;
#endif // !NO_WORKAROUND
XMLT_LOG(mozXMLTermStream::Open,21,("returning\n"));
return NS_OK;
}
// nsIInputStream interface
NS_IMETHODIMP mozXMLTermStream::Close(void)
{
nsresult result;
XMLT_LOG(mozXMLTermStream::Close,20,("\n"));
mUTF8Buffer = "";
mUTF8Offset = 0;
#ifdef NO_WORKAROUND
PRUint32 sourceOffset = 0;
PRUint32 count = 0;
result = mStreamListener->OnDataAvailable(mChannel, mContext,
this, sourceOffset, count);
if (NS_FAILED(result))
return result;
nsresult status = NS_OK;
nsAutoString errorMsg;
result = mStreamListener->OnStopRequest(mChannel, mContext, status);
if (NS_FAILED(result))
return result;
mContext = nsnull;
mLoadGroup = nsnull;
mChannel = nsnull;
mStreamListener = nsnull;
#else // !NO_WORKAROUND
result = mDOMHTMLDocument->Close();
if (NS_FAILED(result))
return result;
#endif // !NO_WORKAROUND
if (mMaxResizeHeight && mDOMIFrameElement) {
// Size frame to content
result = SizeToContentHeight(mMaxResizeHeight);
}
mMaxResizeHeight = 0;
// Release interfaces etc
mDOMWindow = nsnull;
mDOMIFrameElement = nsnull;
return NS_OK;
}
/** Adjusts height of frame displaying stream to fit content
* @param maxHeight maximum height of resized frame (pixels)
* (zero value implies no maximum)
*/
NS_IMETHODIMP mozXMLTermStream::SizeToContentHeight(PRInt32 maxHeight)
{
nsresult result;
// Get docshell
nsCOMPtr<nsIDocShell> docShell;
result = mozXMLTermUtils::ConvertDOMWindowToDocShell(mDOMWindow,
getter_AddRefs(docShell));
if (NS_FAILED(result) || !docShell)
return NS_ERROR_FAILURE;
// Get pres context
nsCOMPtr<nsIPresContext> presContext;
result = docShell->GetPresContext(getter_AddRefs(presContext));
if (NS_FAILED(result) || !presContext)
return NS_ERROR_FAILURE;
// Get scrollable view
nsCOMPtr<nsIScrollableView> scrollableView;
result = mozXMLTermUtils::GetPresContextScrollableView(presContext,
getter_AddRefs(scrollableView));
if (NS_FAILED(result) || !scrollableView)
return NS_ERROR_FAILURE;
// Get device context
nsCOMPtr<nsIDeviceContext> deviceContext;
result = mozXMLTermUtils::GetPresContextDeviceContext(presContext,
getter_AddRefs(deviceContext));
if (NS_FAILED(result) || !deviceContext)
return NS_ERROR_FAILURE;
// Determine twips to pixels conversion factor
float pixelScale;
presContext->GetTwipsToPixels(&pixelScale);
// Get scrollbar dimensions in pixels
float sbWidth, sbHeight;
deviceContext->GetScrollBarDimensions(sbWidth, sbHeight);
PRInt32 scrollBarWidth = PRInt32(sbWidth*pixelScale);
PRInt32 scrollBarHeight = PRInt32(sbHeight*pixelScale);
// Determine docshell size in pixels
nsRect shellArea = presContext->GetVisibleArea();
PRInt32 shellWidth = PRInt32((float)shellArea.width * pixelScale);
PRInt32 shellHeight = PRInt32((float)shellArea.height * pixelScale);
// Determine page size in pixels
nscoord contX, contY;
scrollableView->GetContainerSize(&contX, &contY);
PRInt32 pageWidth, pageHeight;
pageWidth = PRInt32((float)contX*pixelScale);
pageHeight = PRInt32((float)contY*pixelScale);
XMLT_WARNING("mozXMLTermStream::SizeToContentHeight: scrollbar %d, %d\n",
scrollBarWidth, scrollBarHeight);
XMLT_WARNING("mozXMLTermStream::SizeToContentHeight: presShell %d, %d\n",
shellWidth, shellHeight);
XMLT_WARNING("mozXMLTermStream::SizeToContentHeight: page %d, %d, %e\n",
pageWidth, pageHeight, pixelScale);
if ((pageHeight > shellHeight) || (pageWidth > shellWidth)) {
// Page larger than docshell
nsAutoString attHeight(NS_LITERAL_STRING("height"));
nsAutoString attWidth(NS_LITERAL_STRING("width"));
nsAutoString attValue; attValue.SetLength(0);
PRInt32 newPageHeight = pageHeight;
PRInt32 excessWidth = (pageWidth+scrollBarWidth - shellWidth);
XMLT_WARNING("mozXMLTermStream::SizeToContentHeight: excessWidth %d\n",
excessWidth);
if (excessWidth > 0) {
// Widen IFRAME beyond page width by scrollbar width
attValue.SetLength(0);
attValue.AppendInt(shellWidth+scrollBarWidth);
mDOMIFrameElement->SetAttribute(attWidth,attValue);
// Recompute page dimensions
scrollableView->GetContainerSize(&contX, &contY);
pageWidth = PRInt32((float)contX*pixelScale);
pageHeight = PRInt32((float)contY*pixelScale);
newPageHeight = pageHeight;
if (excessWidth > scrollBarWidth)
newPageHeight += scrollBarHeight;
XMLT_WARNING("mozXMLTermStream::SizeToContentHeight: page2 %d, %d, %d\n",
pageWidth, pageHeight, newPageHeight);
// Reset IFRAME width
attValue.SetLength(0);
attValue.AppendInt(shellWidth);
mDOMIFrameElement->SetAttribute(attWidth,attValue);
}
// Resize IFRAME height to match page height (subject to a maximum)
if (newPageHeight > maxHeight) newPageHeight = maxHeight;
attValue.SetLength(0);
attValue.AppendInt(newPageHeight);
mDOMIFrameElement->SetAttribute(attHeight,attValue);
}
return NS_OK;
}
// nsIInputStream interface
NS_IMETHODIMP mozXMLTermStream::Available(PRUint32 *_retval)
{
if (!_retval)
return NS_ERROR_NULL_POINTER;
*_retval = mUTF8Buffer.Length() - mUTF8Offset;
XMLT_LOG(mozXMLTermStream::Available,60,("retval=%d\n", *_retval));
return NS_OK;
}
NS_IMETHODIMP mozXMLTermStream::Read(char* buf, PRUint32 count,
PRUint32* _retval)
{
XMLT_LOG(mozXMLTermStream::Read,60,("count=%d\n", count));
if (!_retval)
return NS_ERROR_NULL_POINTER;
PR_ASSERT(mUTF8Buffer.Length() >= mUTF8Offset);
PRUint32 remCount = mUTF8Buffer.Length() - mUTF8Offset;
if (remCount == 0) {
// Empty buffer
*_retval = 0;
return NS_OK;
}
if (count >= remCount) {
// Return entire remaining buffer
*_retval = remCount;
} else {
// Return only portion of buffer
*_retval = count;
}
// Copy portion of string
PL_strncpyz(buf, mUTF8Buffer.get() + mUTF8Offset, *_retval);
mUTF8Offset += *_retval;
XMLT_LOG(mozXMLTermStream::Read,61,("*retval=%d\n", *_retval));
return NS_OK;
}
/** Write Unicode string to stream (blocks until write is completed)
* @param buf string to write
* @return NS_OK on success
*/
NS_IMETHODIMP mozXMLTermStream::Write(const PRUnichar* buf)
{
nsresult result;
XMLT_LOG(mozXMLTermStream::Write,50,("\n"));
if (!buf)
return NS_ERROR_FAILURE;
nsAutoString strBuf ( buf );
// Convert Unicode string to UTF8 and store in buffer
char* utf8Str = ToNewUTF8String(strBuf);
mUTF8Buffer = utf8Str;
nsMemory::Free(utf8Str);
mUTF8Offset = 0;
#ifdef NO_WORKAROUND
PRUint32 sourceOffset = 0;
while (mUTF8Offset < mUTF8Buffer.Length()) {
PRUint32 remCount = mUTF8Buffer.Length() - mUTF8Offset;
result = mStreamListener->OnDataAvailable(mChannel, mContext,
this, sourceOffset, remCount);
if (NS_FAILED(result))
return result;
}
#else // !NO_WORKAROUND
result = mDOMHTMLDocument->Write(strBuf);
if (NS_FAILED(result))
return result;
#endif // !NO_WORKAROUND
XMLT_WARNING("mozXMLTermStream::Write: str=%s\n", mUTF8Buffer.get());
XMLT_LOG(mozXMLTermStream::Write,51,("returning mUTF8Offset=%d\n",
mUTF8Offset));
return NS_OK;
}
NS_IMETHODIMP
mozXMLTermStream::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval)
{
NS_NOTREACHED("ReadSegments");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
mozXMLTermStream::IsNonBlocking(PRBool *aNonBlocking)
{
*aNonBlocking = PR_TRUE;
return NS_OK;
}
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