gecko-dev/editor/base/IMETextTxn.cpp

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8.0 KiB
C++

/* -*- 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 "IMETextTxn.h"
#include "IMECommitTxn.h"
#include "nsEditor.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMTextRange.h"
#include "nsIDOMTextRangeList.h"
#include "nsIDOMSelection.h"
#include "nsIPresShell.h"
#include "EditAggregateTxn.h"
static NS_DEFINE_IID(kIMETextTxnIID, IME_TEXT_TXN_IID);
static NS_DEFINE_IID(kIDOMSelectionIID, NS_IDOMSELECTION_IID);
nsIAtom *IMETextTxn::gIMETextTxnName = nsnull;
nsresult IMETextTxn::ClassInit()
{
if (nsnull==gIMETextTxnName)
gIMETextTxnName = NS_NewAtom("NS_IMETextTxn");
return NS_OK;
}
IMETextTxn::IMETextTxn()
: EditTxn()
{
}
IMETextTxn::~IMETextTxn()
{
mRangeList = do_QueryInterface(nsnull);
}
NS_IMETHODIMP IMETextTxn::Init(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aReplaceLength,
nsIDOMTextRangeList* aTextRangeList,
const nsString &aStringToInsert,
nsIPresShell *aPresShell)
{
mElement = do_QueryInterface(aElement);
mOffset = aOffset;
mReplaceLength = aReplaceLength;
mStringToInsert = aStringToInsert;
mPresShell = aPresShell;
mRangeList = do_QueryInterface(aTextRangeList);
mFixed = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP IMETextTxn::Do(void)
{
#ifdef DEBUG_TAGUE
printf("Do IME Text element = %p\n", mElement.get());
#endif
// advance caret: This requires the presentation shell to get the selection.
nsCOMPtr<nsIDOMSelection> selection;
nsresult result = mPresShell->GetSelection(getter_AddRefs(selection));
NS_ASSERTION(selection,"Could not get selection in IMEtextTxn::Do\n");
if (NS_SUCCEEDED(result) && selection) {
if (mReplaceLength==0) {
result = mElement->InsertData(mOffset,mStringToInsert);
} else {
result = mElement->ReplaceData(mOffset,mReplaceLength,mStringToInsert);
}
if (NS_SUCCEEDED(result)) {
result = CollapseTextSelection();
}
}
return result;
}
NS_IMETHODIMP IMETextTxn::Undo(void)
{
#ifdef DEBUG_TAGUE
printf("Undo IME Text element = %p\n", mElement.get());
#endif
nsresult result;
PRUint32 length = mStringToInsert.Length();
result = mElement->DeleteData(mOffset, length);
if (NS_SUCCEEDED(result))
{ // set the selection to the insertion point where the string was removed
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection) {
result = selection->Collapse(mElement, mOffset);
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of IME insert.");
}
}
return result;
}
NS_IMETHODIMP IMETextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
#ifdef DEBUG_TAGUE
printf("Merge IME Text element = %p\n", mElement.get());
#endif
//
// check to make sure we have valid return pointers
//
if ((nsnull==aDidMerge) && (nsnull==aTransaction))
{
return NS_OK;
}
//
// check to make sure we aren't fixed, if we are then nothing get's absorbed
//
if (mFixed) {
*aDidMerge = PR_FALSE;
return NS_OK;
}
//
// if aTransaction is another IMETextTxn then absorbe it
//
nsCOMPtr<IMETextTxn> otherTxn(do_QueryInterface(aTransaction));
if (otherTxn)
{
//
// we absorbe the next IME transaction by adopting it's insert string as our own
//
nsIDOMTextRangeList* newTextRangeList;
otherTxn->GetData(mStringToInsert,&newTextRangeList);
mRangeList = do_QueryInterface(newTextRangeList);
*aDidMerge = PR_TRUE;
#ifdef DEBUG_TAGUE
printf("IMETextTxn assimilated IMETextTxn:%p\n", aTransaction);
#endif
return NS_OK;
}
//
// second possible case is that we have a commit transaction
//
nsCOMPtr<IMECommitTxn> commitTxn(do_QueryInterface(aTransaction));
if (commitTxn)
{
(void)CollapseTextSelectionOnCommit();
mFixed = PR_TRUE;
*aDidMerge = PR_TRUE; // absorbe the commit transaction
#ifdef DEBUG_TAGUE
printf("IMETextTxn assimilated IMECommitTxn%p\n", aTransaction);
#endif
return NS_OK;
}
*aDidMerge = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP IMETextTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP IMETextTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Remove Text: ";
*aString += mStringToInsert;
}
return NS_OK;
}
NS_IMETHODIMP IMETextTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Insert Text: ";
*aString += mStringToInsert;
}
return NS_OK;
}
/* ============= nsISupports implementation ====================== */
NS_IMETHODIMP
IMETextTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
if (nsnull == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kIMETextTxnIID)) {
*aInstancePtr = (void*)(IMETextTxn*)this;
NS_ADDREF_THIS();
return NS_OK;
}
return (EditTxn::QueryInterface(aIID, aInstancePtr));
}
/* ============ protected methods ================== */
NS_IMETHODIMP IMETextTxn::GetData(nsString& aResult,nsIDOMTextRangeList** aTextRangeList)
{
aResult = mStringToInsert;
*aTextRangeList = mRangeList;
return NS_OK;
}
NS_IMETHODIMP IMETextTxn::CollapseTextSelection(void)
{
nsresult result;
PRBool haveSelectedRange;
PRUint16 textRangeListLength,selectionStart,selectionEnd,
textRangeType, i;
nsIDOMTextRange* textRange;
haveSelectedRange = PR_FALSE;
#ifdef DEBUG_tague
PRUint16 listlen,start,stop,type;
nsIDOMTextRange* rangePtr;
result = mRangeList->GetLength(&listlen);
printf("nsIDOMTextRangeList[%p]\n",mRangeList);
for (i=0;i<listlen;i++) {
(void)mRangeList->Item(i,&rangePtr);
rangePtr->GetRangeStart(&start);
rangePtr->GetRangeEnd(&stop);
rangePtr->GetRangeType(&type);
printf("range[%d] start=%d end=%d type=",i,start,stop,type);
if (type==nsIDOMTextRange::TEXTRANGE_RAWINPUT) printf("TEXTRANGE_RAWINPUT\n");
if (type==nsIDOMTextRange::TEXTRANGE_SELECTEDRAWTEXT) printf("TEXTRANGE_SELECTEDRAWTEXT\n");
if (type==nsIDOMTextRange::TEXTRANGE_CONVERTEDTEXT) printf("TEXTRANGE_CONVERTEDTEXT\n");
if (type==nsIDOMTextRange::TEXTRANGE_SELECTEDCONVERTEDTEXT) printf("TEXTRANGE_SELECTEDCONVERTEDTEXT\n");
}
#endif
//
// run through the text range list
//
result = mRangeList->GetLength(&textRangeListLength);
if (NS_SUCCEEDED(result))
{
for(i=0;i<textRangeListLength;i++) {
result = mRangeList->Item(i,&textRange);
if (NS_SUCCEEDED(result))
{
result = textRange->GetRangeType(&textRangeType);
if (textRangeType==nsIDOMTextRange::TEXTRANGE_SELECTEDCONVERTEDTEXT)
{
haveSelectedRange = PR_TRUE;
textRange->GetRangeStart(&selectionStart);
textRange->GetRangeEnd(&selectionEnd);
}
}
}
}
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection){
if (haveSelectedRange) {
result = selection->Collapse(mElement,mOffset+selectionStart);
result = selection->Extend(mElement,mOffset+selectionEnd+1);
} else {
result = selection->Collapse(mElement,mOffset+mStringToInsert.Length());
}
}
return result;
}
NS_IMETHODIMP IMETextTxn::CollapseTextSelectionOnCommit(void)
{
nsCOMPtr<nsIDOMSelection> selection;
nsresult result = mPresShell->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection){
result = selection->Collapse(mElement,mOffset+mStringToInsert.Length());
}
return result;
}