gecko-dev/editor/libeditor/base/nsStyleSheetTxns.cpp

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#include "nsEditor.h"

#include "nsIPresShell.h"
#include "nsICSSStyleSheet.h"
#include "nsIStyleSet.h"
#include "nsIDocument.h"
#include "nsIDocumentObserver.h"
#include "nsISelectionController.h"


#include "nsStyleSheetTxns.h"



AddStyleSheetTxn::AddStyleSheetTxn()
:  EditTxn()
,  mEditor(NULL)
{
}

AddStyleSheetTxn::~AddStyleSheetTxn()
{
}

NS_IMETHODIMP
AddStyleSheetTxn::Init(nsIEditor *aEditor, nsICSSStyleSheet *aSheet)
{
  if (!aEditor)
    return NS_ERROR_INVALID_ARG;

  if (!aSheet)
    return NS_ERROR_INVALID_ARG;

  mEditor = aEditor;
  mSheet = do_QueryInterface(aSheet);
  
  return NS_OK;
}


NS_IMETHODIMP
AddStyleSheetTxn::DoTransaction()
{
  if (!mEditor || !mSheet)
    return NS_ERROR_NOT_INITIALIZED;
  
  nsCOMPtr<nsISelectionController> selCon;
  mEditor->GetSelectionController(getter_AddRefs(selCon));
  if (!selCon)
    return NS_ERROR_UNEXPECTED;

  nsCOMPtr<nsIPresShell> presShell;
  presShell = do_QueryInterface(selCon);

  if (!presShell)
    return NS_ERROR_UNEXPECTED;
  
  nsCOMPtr<nsIStyleSet> styleSet;
  nsresult rv = presShell->GetStyleSet(getter_AddRefs(styleSet));

  if (NS_SUCCEEDED(rv) && styleSet)
  {
    nsCOMPtr<nsIStyleSheet> styleSheet     = do_QueryInterface(mSheet);

    if (styleSheet)
    {
      nsCOMPtr<nsIDocument> document;
      rv = presShell->GetDocument(getter_AddRefs(document));

      if (NS_SUCCEEDED(rv) && document)
        document->AddStyleSheet(styleSheet, 0);
    }
  }
  
  return rv;
}

NS_IMETHODIMP
AddStyleSheetTxn::UndoTransaction()
{
  if (!mEditor || !mSheet)
    return NS_ERROR_NOT_INITIALIZED;
  
  nsCOMPtr<nsISelectionController> selCon;
  mEditor->GetSelectionController(getter_AddRefs(selCon));
  if (!selCon)
    return NS_ERROR_UNEXPECTED;

  nsCOMPtr<nsIPresShell> presShell;
  presShell = do_QueryInterface(selCon);
  if (!presShell)
    return NS_ERROR_UNEXPECTED;
  
  nsCOMPtr<nsIStyleSet> styleSet;
  nsresult rv = presShell->GetStyleSet(getter_AddRefs(styleSet));

  if (NS_SUCCEEDED(rv) && styleSet)
  {
    styleSet->RemoveDocStyleSheet(mSheet);

    nsCOMPtr<nsIDocumentObserver> observer = do_QueryInterface(presShell);
    nsCOMPtr<nsIStyleSheet> styleSheet     = do_QueryInterface(mSheet);
    nsCOMPtr<nsIDocument> document;

    rv = presShell->GetDocument(getter_AddRefs(document));

    if (NS_SUCCEEDED(rv) && document && observer && styleSheet)
      rv = observer->StyleSheetRemoved(document, styleSheet);
  }
  
  return rv;
}

NS_IMETHODIMP
AddStyleSheetTxn::RedoTransaction()
{
   return DoTransaction();
}

NS_IMETHODIMP
AddStyleSheetTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
  // set out param default value
  if (!aDidMerge)
    return NS_ERROR_NULL_POINTER;
    
  *aDidMerge = PR_FALSE;
  return NS_OK;
}

NS_IMETHODIMP
AddStyleSheetTxn::GetTxnDescription(nsAString& aString)
{
  aString.Assign(NS_LITERAL_STRING("AddStyleSheetTxn"));
  return NS_OK;
}

#ifdef XP_MAC
#pragma mark -
#endif


RemoveStyleSheetTxn::RemoveStyleSheetTxn()
:  EditTxn()
,  mEditor(NULL)
{
}

RemoveStyleSheetTxn::~RemoveStyleSheetTxn()
{
}

NS_IMETHODIMP
RemoveStyleSheetTxn::Init(nsIEditor *aEditor, nsICSSStyleSheet *aSheet)
{
  if (!aEditor)
    return NS_ERROR_INVALID_ARG;

  if (!aSheet)
    return NS_ERROR_INVALID_ARG;

  mEditor = aEditor;
  mSheet = do_QueryInterface(aSheet);
  
  return NS_OK;
}


NS_IMETHODIMP
RemoveStyleSheetTxn::DoTransaction()
{
  if (!mEditor || !mSheet)
    return NS_ERROR_NOT_INITIALIZED;
  
  nsCOMPtr<nsISelectionController> selCon;
  mEditor->GetSelectionController(getter_AddRefs(selCon));
  if (!selCon)
    return NS_ERROR_UNEXPECTED;

  nsCOMPtr<nsIPresShell> presShell;
  presShell = do_QueryInterface(selCon);
  if (!presShell)
    return NS_ERROR_UNEXPECTED;
  
  nsCOMPtr<nsIStyleSet> styleSet;
  nsresult rv = presShell->GetStyleSet(getter_AddRefs(styleSet));

  if (NS_SUCCEEDED(rv) && styleSet)
  {
    styleSet->RemoveDocStyleSheet(mSheet);

    nsCOMPtr<nsIDocumentObserver> observer = do_QueryInterface(presShell);
    nsCOMPtr<nsIStyleSheet> styleSheet     = do_QueryInterface(mSheet);
    nsCOMPtr<nsIDocument> document;

    rv = presShell->GetDocument(getter_AddRefs(document));

    if (NS_SUCCEEDED(rv) && document && observer && styleSheet)
      rv = observer->StyleSheetRemoved(document, styleSheet);
  }
  
  return rv;
}

NS_IMETHODIMP
RemoveStyleSheetTxn::UndoTransaction()
{
  if (!mEditor || !mSheet)
    return NS_ERROR_NOT_INITIALIZED;
  
  nsCOMPtr<nsISelectionController> selCon;
  mEditor->GetSelectionController(getter_AddRefs(selCon));
  if (!selCon)
    return NS_ERROR_UNEXPECTED;

  nsCOMPtr<nsIPresShell> presShell;
  presShell = do_QueryInterface(selCon);
  if (!presShell)
    return NS_ERROR_UNEXPECTED;
  
  nsCOMPtr<nsIStyleSet> styleSet;
  nsresult rv = presShell->GetStyleSet(getter_AddRefs(styleSet));

  if (NS_SUCCEEDED(rv) && styleSet)
  {
    nsCOMPtr<nsIStyleSheet> styleSheet     = do_QueryInterface(mSheet);

    if (styleSheet)
    {
      nsCOMPtr<nsIDocument> document;
      rv = presShell->GetDocument(getter_AddRefs(document));

      if (NS_SUCCEEDED(rv) && document)
        document->AddStyleSheet(styleSheet, 0);
    }
  }
  
  return rv;
}

NS_IMETHODIMP
RemoveStyleSheetTxn::RedoTransaction()
{
   return DoTransaction();
}

NS_IMETHODIMP
RemoveStyleSheetTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
  // set out param default value
  if (!aDidMerge)
    return NS_ERROR_NULL_POINTER;
    
  *aDidMerge = PR_FALSE;
  return NS_OK;
}

NS_IMETHODIMP
RemoveStyleSheetTxn::GetTxnDescription(nsAString& aString)
{
  aString.Assign(NS_LITERAL_STRING("RemoveStyleSheetTxn"));
  return NS_OK;
}