xref: /aoo41x/main/vcl/unx/generic/app/i18n_cb.cxx (revision c82f2877)

/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_vcl.hxx"

#include <stdio.h>
#include <string.h>

#include <sal/alloca.h>
#include <osl/thread.h>

#include <tools/prex.h>
#include <X11/Xlocale.h>
#include <X11/Xlib.h>
#include <tools/postx.h>

#include "unx/salunx.h"
#include "unx/XIM.h"
#include "unx/i18n_cb.hxx"
#include "unx/i18n_status.hxx"
#include "unx/i18n_ic.hxx"
#include "unx/i18n_im.hxx"
#include "salframe.hxx"

// -------------------------------------------------------------------------
//
// i. preedit start callback
//
// -------------------------------------------------------------------------

int
PreeditStartCallback ( XIC, XPointer client_data, XPointer )
{
  	preedit_data_t* pPreeditData = (preedit_data_t*)client_data;
	if ( pPreeditData->eState == ePreeditStatusActivationRequired )
	{
		pPreeditData->eState = ePreeditStatusActive;
		pPreeditData->aText.nCursorPos = 0;
		pPreeditData->aText.nLength    = 0;
	}

	return -1;
}

// -------------------------------------------------------------------------
//
// ii. preedit done callback
//
// -------------------------------------------------------------------------

void
PreeditDoneCallback ( XIC, XPointer client_data, XPointer )
{
  	preedit_data_t* pPreeditData = (preedit_data_t*)client_data;
 	if (pPreeditData->eState == ePreeditStatusActive )
	{
        if( pPreeditData->pFrame )
            pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, (void*)NULL );
	}
	pPreeditData->eState = ePreeditStatusStartPending;
}

// -------------------------------------------------------------------------
//
// iii. preedit draw callback
//
// -------------------------------------------------------------------------

//
// Handle deletion of text in a preedit_draw_callback
// from and howmuch are guaranteed to be nonnegative
//

void
Preedit_DeleteText(preedit_text_t *ptext, int from, int howmuch)
{
    // If we've been asked to delete no text then just set
    // nLength correctly and return
    if (ptext->nLength == 0)
    {
        ptext->nLength = from;
        return;
    }

	int to = from + howmuch;

  	if (to == (int)ptext->nLength)
	{
    	// delete from the end of the text
    	ptext->nLength = from;
  	}
	else
        if (to < (int)ptext->nLength)
	{
    	// cut out of the middle of the text
    	memmove( (void*)(ptext->pUnicodeBuffer + from),
				(void*)(ptext->pUnicodeBuffer + to),
				(ptext->nLength - to) * sizeof(sal_Unicode));
    	memmove( (void*)(ptext->pCharStyle + from),
				(void*)(ptext->pCharStyle + to),
				(ptext->nLength - to) * sizeof(XIMFeedback));
    	ptext->nLength -= howmuch;
  	}
	else
    // if ( to > pText->nLength )
    {
      	// XXX this indicates an error, are we out of sync ?
      	fprintf(stderr, "Preedit_DeleteText( from=%i to=%i length=%i )\n",
				from, to, ptext->nLength );
      	fprintf (stderr, "\t XXX internal error, out of sync XXX\n");

      	ptext->nLength = from;
    }

  	// NULL-terminate the string
  	ptext->pUnicodeBuffer[ptext->nLength] = (sal_Unicode)0;
}

// reallocate the textbuffer with sufficiently large size 2^x
// nnewlimit is presupposed to be larger than ptext->size
void
enlarge_buffer ( preedit_text_t *ptext, int nnewlimit )
{
  	size_t nnewsize = ptext->nSize;

  	while ( nnewsize <= (size_t)nnewlimit )
    	nnewsize *= 2;

  	ptext->nSize = nnewsize;
  	ptext->pUnicodeBuffer = (sal_Unicode*)realloc((void*)ptext->pUnicodeBuffer,
			nnewsize * sizeof(sal_Unicode));
  	ptext->pCharStyle = (XIMFeedback*)realloc((void*)ptext->pCharStyle,
		    nnewsize * sizeof(XIMFeedback));
}

//
// Handle insertion of text in a preedit_draw_callback
// string field of XIMText struct is guaranteed to be != NULL
//

void
Preedit_InsertText(preedit_text_t *pText, XIMText *pInsertText, int where,
		   Bool isMultilingual)
{
  	sal_Unicode *pInsertTextString;
  	int nInsertTextLength = 0;
  	XIMFeedback *pInsertTextCharStyle = pInsertText->feedback;

  	nInsertTextLength = pInsertText->length;

  	if (isMultilingual)
	{
    	XIMUnicodeText *pUniText = (XIMUnicodeText*)pInsertText;
    	pInsertTextString = pUniText->string.utf16_char;
  	}
	else
	{
    	//  can't handle wchar_t strings, so convert to multibyte chars first
    	char *pMBString;
    	size_t nMBLength;
    	if (pInsertText->encoding_is_wchar)
		{
			wchar_t *pWCString = pInsertText->string.wide_char;
  			size_t nBytes = wcstombs ( NULL, pWCString, 1024 /* dont care */);
  			pMBString = (char*)alloca( nBytes + 1 );
  			nMBLength = wcstombs ( pMBString, pWCString, nBytes + 1);
    	}
		else
		{
      		pMBString = pInsertText->string.multi_byte;
      		nMBLength = strlen(pMBString); // xxx
    	}

		// convert multibyte chars to unicode
    	rtl_TextEncoding nEncoding = osl_getThreadTextEncoding();

    	if (nEncoding != RTL_TEXTENCODING_UNICODE)
		{
      		rtl_TextToUnicodeConverter aConverter =
					rtl_createTextToUnicodeConverter( nEncoding );
      		rtl_TextToUnicodeContext aContext =
					rtl_createTextToUnicodeContext(aConverter);

      		sal_Size nBufferSize = nInsertTextLength * 2;

      		pInsertTextString = (sal_Unicode*)alloca(nBufferSize);

      		sal_uInt32  nConversionInfo;
      		sal_Size    nConvertedChars;

			rtl_convertTextToUnicode( aConverter, aContext,
					pMBString, nMBLength,
	 				pInsertTextString, nBufferSize,
					  RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_IGNORE
					| RTL_TEXTTOUNICODE_FLAGS_INVALID_IGNORE,
					&nConversionInfo, &nConvertedChars );

      		rtl_destroyTextToUnicodeContext(aConverter, aContext);
      		rtl_destroyTextToUnicodeConverter(aConverter);

    	}
		else
		{
      		pInsertTextString = (sal_Unicode*)pMBString;
    	}
  	}

  	// enlarge target text-buffer if necessary
  	if (pText->nSize <= (pText->nLength + nInsertTextLength))
    	enlarge_buffer(pText, pText->nLength + nInsertTextLength);

  	// insert text: displace old mem and put new bytes in
  	int from    = where;
  	int to      = where + nInsertTextLength;
  	int howmany = pText->nLength - where;

  	memmove((void*)(pText->pUnicodeBuffer + to),
			(void*)(pText->pUnicodeBuffer + from),
	  		howmany * sizeof(sal_Unicode));
  	memmove((void*)(pText->pCharStyle + to),
	  		(void*)(pText->pCharStyle + from),
	  		howmany * sizeof(XIMFeedback));

  	to = from;
  	howmany = nInsertTextLength;

  	memcpy((void*)(pText->pUnicodeBuffer + to), (void*)pInsertTextString,
	 		howmany * sizeof(sal_Unicode));
  	memcpy((void*)(pText->pCharStyle + to), (void*)pInsertTextCharStyle,
	  		howmany * sizeof(XIMFeedback));

  	pText->nLength += howmany;

  	// NULL-terminate the string
  	pText->pUnicodeBuffer[pText->nLength] = (sal_Unicode)0;
}

//
// Handle the change of attributes in a preedit_draw_callback
//
void
Preedit_UpdateAttributes ( preedit_text_t* ptext, XIMFeedback* feedback,
		int from, int amount )
{
	if ( (from + amount) > (int)ptext->nLength )
	{
		// XXX this indicates an error, are we out of sync ?
		fprintf (stderr, "Preedit_UpdateAttributes( %i + %i > %i )\n",
			from, amount, ptext->nLength );
		fprintf (stderr, "\t XXX internal error, out of sync XXX\n");

		return;
	}

	memcpy ( ptext->pCharStyle + from,
		feedback, amount * sizeof(XIMFeedback) );
}

// Convert the XIM feedback values into appropriate VCL
// SAL_EXTTEXTINPUT_ATTR values
// returns an allocate list of attributes, which must be freed by caller
sal_uInt16*
Preedit_FeedbackToSAL ( XIMFeedback* pfeedback, int nlength, std::vector<sal_uInt16>& rSalAttr )
{
  	sal_uInt16 *psalattr;
  	sal_uInt16  nval;
  	sal_uInt16  noldval = 0;
  	XIMFeedback nfeedback;

  	// only work with reasonable length
  	if (nlength > 0 && nlength > sal::static_int_cast<int>(rSalAttr.size()) )
    {
        rSalAttr.reserve( nlength );
    	psalattr = &rSalAttr[0];
    }
  	else
    	return (sal_uInt16*)NULL;

  	for (int npos = 0; npos < nlength; npos++)
	{
    	nval = 0;
    	nfeedback = pfeedback[npos];

    	// means to use the feedback of the previous char
    	if (nfeedback == 0)
		{
      		nval = noldval;
   		}
    	// convert feedback to attributes
    	else
		{
      		if (nfeedback & XIMReverse)
			    nval |= SAL_EXTTEXTINPUT_ATTR_HIGHLIGHT;
      		if (nfeedback & XIMUnderline)
				nval |= SAL_EXTTEXTINPUT_ATTR_UNDERLINE;
      		if (nfeedback & XIMHighlight)
				nval |= SAL_EXTTEXTINPUT_ATTR_HIGHLIGHT;
      		if (nfeedback & XIMPrimary)
				nval |= SAL_EXTTEXTINPUT_ATTR_DOTTEDUNDERLINE;
      		if (nfeedback & XIMSecondary)
				nval |= SAL_EXTTEXTINPUT_ATTR_DASHDOTUNDERLINE;
      		if (nfeedback & XIMTertiary) // same as 2ery
				nval |= SAL_EXTTEXTINPUT_ATTR_DASHDOTUNDERLINE;

			/*
			// visibility feedback not supported now
      		if (   (nfeedback & XIMVisibleToForward)
	  			|| (nfeedback & XIMVisibleToBackward)
	  			|| (nfeedback & XIMVisibleCenter) )
			{ }
			*/
    	}
    	// copy in list
    	psalattr[npos] = nval;
    	noldval = nval;
  	}
  	// return list of sal attributes
 	return psalattr;
}

void
PreeditDrawCallback(XIC ic, XPointer client_data,
		    XIMPreeditDrawCallbackStruct *call_data)
{
  	preedit_data_t* pPreeditData = (preedit_data_t*)client_data;

	// if there's nothing to change then change nothing
	if ( ( (call_data->text == NULL) && (call_data->chg_length == 0) )
         || pPreeditData->pFrame == NULL )
		return;

    // #88564# Solaris 7 deletes the preedit buffer after commit
    // since the next call to preeditstart will have the same effect just skip this.
    // if (pPreeditData->eState == ePreeditStatusStartPending && call_data->text == NULL)
    //    return;

	if ( pPreeditData->eState == ePreeditStatusStartPending )
		pPreeditData->eState = ePreeditStatusActivationRequired;
	PreeditStartCallback( ic, client_data, NULL );

  	// Edit the internal textbuffer as indicated by the call_data,
  	// chg_first and chg_length are guaranteed to be nonnegative

  	// handle text deletion
  	if (call_data->text == NULL)
	{
    	Preedit_DeleteText(&(pPreeditData->aText),
		       call_data->chg_first, call_data->chg_length );
  	}
	else
	{
    	// handle text insertion
    	if (   (call_data->chg_length == 0)
			&& (call_data->text->string.wide_char != NULL))
		{
      		Preedit_InsertText(&(pPreeditData->aText), call_data->text,
			 		call_data->chg_first, pPreeditData->bIsMultilingual);
    	}
		else
      	// handle text replacement by deletion and insertion of text,
      	// not smart, just good enough
      	if (   (call_data->chg_length != 0)
	  		&& (call_data->text->string.wide_char != NULL))
		{
			Preedit_DeleteText(&(pPreeditData->aText),
			   		call_data->chg_first, call_data->chg_length);
			Preedit_InsertText(&(pPreeditData->aText), call_data->text,
			   		call_data->chg_first, pPreeditData->bIsMultilingual);
      	}
		else
		// not really a text update, only attributes are concerned
		if (   (call_data->chg_length != 0)
	    	&& (call_data->text->string.wide_char == NULL))
		{
	  		Preedit_UpdateAttributes(&(pPreeditData->aText),
				   call_data->text->feedback,
				   call_data->chg_first, call_data->chg_length);
		}
  	}

  	//
  	// build the SalExtTextInputEvent and send it up
  	//
  	pPreeditData->aInputEv.mnTime = 0;
  	pPreeditData->aInputEv.mpTextAttr = Preedit_FeedbackToSAL(
			pPreeditData->aText.pCharStyle, pPreeditData->aText.nLength, pPreeditData->aInputFlags);
  	pPreeditData->aInputEv.mnCursorPos = call_data->caret;
  	pPreeditData->aInputEv.maText = String (pPreeditData->aText.pUnicodeBuffer,
                                pPreeditData->aText.nLength);
	pPreeditData->aInputEv.mnCursorFlags 	= 0; // default: make cursor visible
  	pPreeditData->aInputEv.mnDeltaStart = 0; // call_data->chg_first;
  	pPreeditData->aInputEv.mbOnlyCursor = False;

  	if ( pPreeditData->eState == ePreeditStatusActive && pPreeditData->pFrame )
    	pPreeditData->pFrame->CallCallback(SALEVENT_EXTTEXTINPUT, (void*)&pPreeditData->aInputEv);
    if (pPreeditData->aText.nLength == 0 && pPreeditData->pFrame )
	    pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, (void*)NULL );

    if (pPreeditData->aText.nLength == 0)
        pPreeditData->eState = ePreeditStatusStartPending;

	GetPreeditSpotLocation(ic, (XPointer)pPreeditData);
}

void
GetPreeditSpotLocation(XIC ic, XPointer client_data)
{
  	//
  	// Send SalEventExtTextInputPos event to get spotlocation
  	//
  	SalExtTextInputPosEvent mPosEvent;
  	preedit_data_t* pPreeditData = (preedit_data_t*)client_data;

    if( pPreeditData->pFrame )
        pPreeditData->pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, (void*)&mPosEvent);

  	XPoint point;
  	point.x = mPosEvent.mnX + mPosEvent.mnWidth;
  	point.y = mPosEvent.mnY + mPosEvent.mnHeight;

  	XVaNestedList preedit_attr;
  	preedit_attr = XVaCreateNestedList(0, XNSpotLocation, &point, NULL);
  	XSetICValues(ic, XNPreeditAttributes, preedit_attr, NULL);
  	XFree(preedit_attr);

	return;
}

// -------------------------------------------------------------------------
//
// iv. preedit caret callback
//
// -------------------------------------------------------------------------

#if OSL_DEBUG_LEVEL > 1
void
PreeditCaretCallback ( XIC ic, XPointer client_data,
	XIMPreeditCaretCallbackStruct *call_data )
#else
void
PreeditCaretCallback ( XIC, XPointer,XIMPreeditCaretCallbackStruct* )
#endif
{
    #if OSL_DEBUG_LEVEL > 1
	// XXX PreeditCaretCallback is pure debug code for now
	const char *direction = "?";
	const char *style = "?";

	switch ( call_data->style )
	{
		case XIMIsInvisible: style = "Invisible"; break;
		case XIMIsPrimary:   style = "Primary";   break;
		case XIMIsSecondary: style = "Secondary"; break;
	}
	switch ( call_data->direction )
	{
		case XIMForwardChar:  direction = "Forward char";  break;
		case XIMBackwardChar: direction = "Backward char"; break;
		case XIMForwardWord:  direction = "Forward word";  break;
		case XIMBackwardWord: direction = "Backward word"; break;
		case XIMCaretUp:      direction = "Caret up";      break;
		case XIMCaretDown:    direction = "Caret down";    break;
		case XIMNextLine:     direction = "Next line";     break;
		case XIMPreviousLine: direction = "Previous line"; break;
		case XIMLineStart:    direction = "Line start";    break;
		case XIMLineEnd:      direction = "Line end";      break;
		case XIMAbsolutePosition: direction = "Absolute";  break;
		case XIMDontChange:   direction = "Dont change";   break;
	}

	fprintf (stderr, "PreeditCaretCallback( ic=%p, client=%p,\n",
		ic, client_data );
	fprintf (stderr, "\t position=%i, direction=\"%s\", style=\"%s\" )\n",
		call_data->position, direction, style );
    #endif
}

// -----------------------------------------------------------------------
//
// v. commit string callback: convert an extended text input (iiimp ... )
//     into an ordinary key-event
//
// -----------------------------------------------------------------------

Bool
IsControlCode(sal_Unicode nChar)
{
    if ( nChar <= 0x1F // C0 controls
     /* || (0x80 <= nChar && nChar <= 0x9F) C1 controls */ )
        return True;
    else
        return False;
}

int
CommitStringCallback( XIC ic, XPointer client_data, XPointer call_data )
{
	preedit_data_t* pPreeditData = (preedit_data_t*)client_data;

  	XIMUnicodeText *cbtext = (XIMUnicodeText *)call_data;
  	sal_Unicode *p_unicode_data = (sal_Unicode*)cbtext->string.utf16_char;

    // #86964# filter unexpected pure control events
    if (cbtext->length == 1 && IsControlCode(p_unicode_data[0]) )
    {
        if( pPreeditData->pFrame )
        {
            pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, (void*)NULL );
        }
    }
    else
    {
        if( pPreeditData->pFrame )
        {
            pPreeditData->aInputEv.mnTime 			= 0;
            pPreeditData->aInputEv.mpTextAttr 		= 0;
            pPreeditData->aInputEv.mnCursorPos 		= cbtext->length;
            pPreeditData->aInputEv.maText 			= UniString(p_unicode_data, cbtext->length);
            pPreeditData->aInputEv.mnCursorFlags 	= 0; // default: make cursor visible
            pPreeditData->aInputEv.mnDeltaStart 	= 0;
            pPreeditData->aInputEv.mbOnlyCursor 	= False;

            pPreeditData->pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, (void*)&pPreeditData->aInputEv);
            pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, (void*)NULL );
        }
    }
	pPreeditData->eState = ePreeditStatusStartPending;

	GetPreeditSpotLocation(ic, (XPointer)pPreeditData);

	return 0;
}

// ----------------------------------------------------------------------------------
//
// vi. status callbacks: for now these are empty, they are just needed for turbo linux
//
// ----------------------------------------------------------------------------------

void
StatusStartCallback (XIC, XPointer, XPointer)
{
	return;
}

void
StatusDoneCallback (XIC, XPointer, XPointer)
{
	return;
}

void
StatusDrawCallback (XIC ic, XPointer client_data, XIMStatusDrawCallbackStruct *call_data)
{
  	preedit_data_t* pPreeditData = (preedit_data_t*)client_data;
    if( pPreeditData->bIsMultilingual )
    {
        // IIIMP
        XIMUnicodeText *cbtext = (XIMUnicodeText *)call_data->data.text;
        ::vcl::I18NStatus::get().setStatusText( String( cbtext->string.utf16_char, call_data->data.text->length ) );
        XIMUnicodeCharacterSubset* pSubset = NULL;
        if( ! XGetICValues( ic,
                            XNUnicodeCharacterSubset, & pSubset,
                            NULL )
            && pSubset )
        {
            ::vcl::I18NStatus::get().changeIM( String( ByteString( pSubset->name ), RTL_TEXTENCODING_UTF8 ) );
#if OSL_DEBUG_LEVEL > 1
            fprintf( stderr, "got XNUnicodeCharacterSubset\n   %d\n   %d\n   %s\n   %d\n", pSubset->index, pSubset->subset_id, pSubset->name, pSubset->is_active );
#endif
        }
    }
    else if( call_data->type == XIMTextType )
    {
		String aText;
		if( call_data->data.text )
		{
			// XIM with text
			sal_Char* pMBString = NULL;
			size_t nLength = 0;
			if( call_data->data.text->encoding_is_wchar )
			{
				if( call_data->data.text->string.wide_char )
				{
					wchar_t* pWString = call_data->data.text->string.wide_char;
					size_t nBytes = wcstombs( NULL, pWString, 1024 );
					pMBString = (sal_Char*)alloca( nBytes+1 );
					nLength = wcstombs( pMBString, pWString, nBytes+1 );
				}
			}
			else
			{
				if( call_data->data.text->string.multi_byte )
				{
					pMBString = call_data->data.text->string.multi_byte;
					nLength = strlen( pMBString );
				}
			}
			if( nLength )
	        	aText = String( pMBString, nLength, gsl_getSystemTextEncoding() );
		}
        ::vcl::I18NStatus::get().setStatusText( aText );
    }
#if OSL_DEBUG_LEVEL > 1
    else
        fprintf( stderr, "XIMStatusDataType %s not supported\n",
                 call_data->type == XIMBitmapType ? "XIMBitmapType" : ByteString::CreateFromInt32( call_data->type ).GetBuffer() );
#endif
	return;
}

void
SwitchIMCallback (XIC, XPointer, XPointer call_data)
{
    XIMSwitchIMNotifyCallbackStruct* pCallData = (XIMSwitchIMNotifyCallbackStruct*)call_data;
    ::vcl::I18NStatus::get().changeIM( String( ByteString( pCallData->to->name ), RTL_TEXTENCODING_UTF8 ) );
}

// ----------------------------------------------------------------------------------
//
// vii. destroy callbacks: internally disable all IC/IM calls
//
// ----------------------------------------------------------------------------------

void
IC_IMDestroyCallback (XIM, XPointer client_data, XPointer)
{
    SalI18N_InputContext *pContext = (SalI18N_InputContext*)client_data;
    if (pContext != NULL)
        pContext->HandleDestroyIM();
}

void
IM_IMDestroyCallback (XIM, XPointer client_data, XPointer)
{
    SalI18N_InputMethod *pMethod = (SalI18N_InputMethod*)client_data;
    if (pMethod != NULL)
        pMethod->HandleDestroyIM();
}