ui.c

/*
    This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop
    Copyright (C) 2003-2009 Toby Thain, toby@telegraphics.net
    Copyright (C) 2018-2023 Daniel Marschall, ViaThinkSoft

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/* This is PLATFORM INDEPENDENT user interface code - mainly dialog logic */

#include "ff.h"

#include "node.h"
#include "funcs.h"
#include "y.tab.h"
#include "choosefile.h"
#include "sprintf_tiny.h"
#include "compat_string.h"

#ifdef MAC_ENV
	#include <plstringfuncs.h>
#endif

Boolean doupdates = true;

void updateglobals(DIALOGREF dp);
struct node *updateexpr(DIALOGREF dp,int i);
void updatedialog(DIALOGREF dp);
void slidertextchanged(DIALOGREF dp,int item);
void updatezoom(DIALOGREF dp);

void updatedialog(DIALOGREF dp){
	int i;

	doupdates = false;

	for(i = 0; i < 8; ++i){
		SETSLIDERVALUE(dp,FIRSTCTLITEM+i, gdata->parm.val[i]);
		SETCTLTEXTINT(dp,FIRSTCTLTEXTITEM+i, gdata->parm.val[i],false);
	}

	for(i = 0; i < 4; ++i){
		if(!gdata->parm.standalone)
			SETCTLTEXT(dp,FIRSTEXPRITEM+i, gdata->parm.szFormula[i]);
		if(i < nplanes)
			updateexpr(dp,FIRSTEXPRITEM+i);
	}

	if(!gdata->parm.standalone)
		SELECTCTLTEXT(dp,FIRSTEXPRITEM,0,-1);

	doupdates = true;
}

/**
copy dialog settings to global variables (sliders, expressions)
*/
void updateglobals(DIALOGREF dp){

	UNREFERENCED_PARAMETER(dp);

}

struct node *updateexpr(DIALOGREF dp,int item){
	char s[MAXEXPR];
	int i;

	i = item - FIRSTEXPRITEM;

	freetree(tree[i]);

	if(!gdata->parm.standalone){
		GETCTLTEXT(dp,item,s,MAXEXPR); // cchMax: NULL is included, so MAXEXPR is correct
		strcpy(gdata->parm.szFormula[i], s);
	}

	tree[i] = parseexpr(gdata->parm.szFormula[i]);

	if(!gdata->parm.standalone){
		if(tree[i])
			HideDialogItem(dp,FIRSTICONITEM+i);
		else{
			err[i] = errstr;
			errstart[i] = tokstart;
			errpos[i] = tokpos;
			ShowDialogItem(dp,FIRSTICONITEM+i);
		}
	}
	return tree[i];
}

void updatezoom(DIALOGREF dp){
	char s[10];
	sprintf(s, "%d%%", (int)(100./zoomfactor));
	SETCTLTEXT(dp,ZOOMLEVELITEM,s);
	if (zoomfactor > 1.)
		ENABLEDLGITEM(dp, ZOOMINITEM);   // ShowDialogItem(dp,ZOOMINITEM);
	else
		DISABLEDLGITEM(dp, ZOOMINITEM);  // HideDialogItem(dp, ZOOMINITEM);
	if(zoomfactor < fitzoom)
		ENABLEDLGITEM(dp, ZOOMOUTITEM);  // ShowDialogItem(dp,ZOOMOUTITEM);
	else
		DISABLEDLGITEM(dp, ZOOMOUTITEM); // HideDialogItem(dp,ZOOMOUTITEM);
}

/**
traverse expression tree, looking for constant references to sliders/maps
*/
static int _checksl(struct node*p,bool32_t ctlflags[], bool32_t mapflags[]){
	int s, i, result;

	result = 0;
	if(p){
		if( (p->kind==TOK_FN1 && p->v.sym->fn == (pfunc_type)ff_ctl)
		 || (p->kind==TOK_FN3 && p->v.sym->fn == (pfunc_type)ff_val) ){
			if(p->child[0]->kind == TOK_NUM){
				s = p->child[0]->v.value;
				if(s>=0 && s<=7)
					ctlflags[s] = 1;
			}else
				result |= CHECKSLIDERS_CTL_AMBIGUOUS; /* can't determine which ctl() */
		}else if(p->kind==TOK_FN2 && p->v.sym->fn == (pfunc_type)ff_map){
			if(p->child[0]->kind == TOK_NUM){
				s = p->child[0]->v.value;
				if(s>=0 && s<=3){
					mapflags[s] = 1;
					ctlflags[s*2] = ctlflags[s*2+1] = 1;
				}
			}else
				result |= CHECKSLIDERS_MAP_AMBIGUOUS; /* can't determine which map() */
		 }

		for( i = 0 ; i < MAXCHILDREN ; ++i )
			result |= _checksl(p->child[i],ctlflags,mapflags);
	}

	return result;
}

int checksliders(int exprs){
	int i, result;

	result = 0;

	for(i = 4; i--;)
		gdata->parm.map_used[i] = 0;
	for(i = 8; i--;)
		gdata->parm.ctl_used[i] = 0;

	for(i = 0; i < exprs; i++)
		result |= _checksl(tree[i], gdata->parm.ctl_used, gdata->parm.map_used);

	return result;
}

void slidermoved(DIALOGREF dp,int i){
	int v = GETSLIDERVALUE(dp,i);
	if (v < 0) v = 0;
	else if (v > 255) v = 255;
	i -= FIRSTCTLITEM;
	gdata->parm.val[i] = (uint8_t)v;
	SETCTLTEXTINT(dp,i+FIRSTCTLTEXTITEM,v,false);
}

void slidertextchanged(DIALOGREF dp,int i){
	int v = GETCTLTEXTINT(dp,i,NULL,false);
	if (v < 0) v = 0;
	else if (v > 255) v = 255;
	i -= FIRSTCTLTEXTITEM;
	SETSLIDERVALUE(dp,i+FIRSTCTLITEM,v);
	gdata->parm.val[i] = (uint8_t)v;
}

void maindlgupdate(DIALOGREF dp){
	int i,unknown;

	unknown = checksliders(nplanes);

	for(i = 0; i < 8; i++)
		if(unknown || gdata->parm.ctl_used[i]){
			ENABLEDLGITEM(dp,FIRSTCTLITEM+i); // TODO: slider is still shown as disabled
			REPAINTCTL(dp, FIRSTCTLITEM+i); // required for PLUGIN.DLL sliders
			ENABLEDLGITEM(dp,FIRSTCTLLABELITEM+i);
			ShowDialogItem(dp,FIRSTCTLTEXTITEM+i); /* FIXME: this changes keyboard focus */
		}else{
			DISABLEDLGITEM(dp,FIRSTCTLITEM+i);
			REPAINTCTL(dp,FIRSTCTLITEM+i); // required for PLUGIN.DLL sliders
			DISABLEDLGITEM(dp,FIRSTCTLLABELITEM+i);
			HideDialogItem(dp,FIRSTCTLTEXTITEM+i); /* FIXME: this changes keyboard focus */
		}

	for(i = 0; i < nplanes; i++)
		if(!tree[i]){
			/* uh oh, couldn't parse one of the saved expressions...this is fatal */
			DISABLEDLGITEM(dp,IDOK);
			if(gdata->parm.standalone){
				// TODO: But before this happens, we get filterBadParameters in filterSelectorStart, since setup() failed
				//       so, do we need this message here at all?
				simplealert_id(MSG_SAVED_EXPR_ERR_ID);
			}else{
				DISABLEDLGITEM(dp,SAVEITEM);
				DISABLEDLGITEM(dp,MAKEITEM);
			}
			return;
		}

	/* we have valid expression trees in all slots...proceed! */
	updateglobals(dp);
	if(setup(gpb))
		recalc_preview(gpb,dp);

	ENABLEDLGITEM(dp,IDOK);
	if(!gdata->parm.standalone){
		ENABLEDLGITEM(dp,SAVEITEM);
		ENABLEDLGITEM(dp,MAKEITEM);
		ENABLEDLGITEM(dp,HELPITEM);
	}
}

/**
one-time initialisation of dialog box
*/
void maindlginit(DIALOGREF dp){
	char s[0x100];
	int i;
	const char *channelsuffixes[] = {
		"", "KA", "I", "RGBA",
		"CMYK", "HSL", "HSB", "1234",
		"DA", "LabA"
	};

	/* hide unused expression items */
	if(gdata->parm.standalone){
		strcpy_win_replace_ampersand(&s[0], &gdata->parm.szAuthor[0]);
		SETCTLTEXT(dp,PARAMAUTHORITEM,s);
		strcpy_win_replace_ampersand(&s[0], &gdata->parm.szCopyright[0]);
		SETCTLTEXT(dp,PARAMCOPYITEM,s);

		// update labels for map() or ctl() sliders
		for(i = 0; i < 8; ++i){
			if(gdata->parm.map_used[i/2]) {
				if((i&1) == 0){
					// even (0, 2, 4, 6)
					strcpy_win_replace_ampersand(&s[0], &gdata->parm.szMap[i/2][0]);
					SETCTLTEXT(dp, FIRSTMAPLABELITEM + (i/2),s);
					HideDialogItem(dp, FIRSTCTLLABELITEM + i);
					HideDialogItem(dp, FIRSTCTLLABELITEM + i + 1);
				}
			} else if(gdata->parm.ctl_used[i]) {
				strcpy_win_replace_ampersand(&s[0], &gdata->parm.szCtl[i][0]);
				SETCTLTEXT(dp, FIRSTCTLLABELITEM+i,s);
				HideDialogItem(dp, FIRSTMAPLABELITEM + i/2);
			} else {
				HideDialogItem(dp, FIRSTCTLITEM + i);
				HideDialogItem(dp, FIRSTCTLTEXTITEM + i);
				HideDialogItem(dp, FIRSTCTLLABELITEM + i);
				HideDialogItem(dp, FIRSTMAPLABELITEM + i/2);
			}
		}
	}

	strcpy(s,"X =");
	for(i = 0; i < 4; ++i){
		if(i >= nplanes){
			HideDialogItem(dp,FIRSTICONITEM+i);
			HideDialogItem(dp,FIRSTEXPRITEM+i);
			HideDialogItem(dp,FIRSTLABELITEM+i);
		}else{
			s[0] = channelsuffixes[gpb->imageMode][i];
			SETCTLTEXT(dp,FIRSTLABELITEM+i,s);
		}
	}

	if(setup_preview(gpb,nplanes)){
		// On very large images, processing a fully zoomed out preview (the initial default)
		// can cause out of memory errors, because Photoshop can't page in all data
		// during advanceState. To prevent this problem, zoom in until we aren't
		// previewing more than say 10% of Photoshop's indicated maxSpace.
		// (e.g., on a 1GB WinXP system, PS CS2 reports 520MB maxSpace, so this will let us
		// preview about 50MB of image data.)

		/* Workaround: GIMP/PSPI sets maxSpace to 100 MB hardcoded, so the zoom is not adjusted correctly. */
		int disable_zoom_memory_check;
		disable_zoom_memory_check = !maxspace_available();

		if (!disable_zoom_memory_check) {
			zoomfactor = sqrt(maxspace()/(10.*preview_w*preview_h*nplanes));
			if(zoomfactor > fitzoom)
				zoomfactor = fitzoom;
			if(zoomfactor < 1.)
				zoomfactor = 1.;
		} else {
			zoomfactor = fitzoom;
		}

		updatezoom(dp);
	}else{
		DISABLEDLGITEM(dp, ZOOMINITEM);    // HideDialogItem(dp,ZOOMINITEM);
		DISABLEDLGITEM(dp, ZOOMOUTITEM);   // HideDialogItem(dp,ZOOMOUTITEM);
		DISABLEDLGITEM(dp, ZOOMLEVELITEM); // HideDialogItem(dp,ZOOMLEVELITEM);
	}

	updatedialog(dp);
	maindlgupdate(dp);
}


/**
process an item hit. return false if the dialog is finished; otherwise return true.
*/
Boolean maindlgitem(DIALOGREF dp,int item){
	extern int previewerr;

	StandardFileReply sfr;
	NavReplyRecord reply;
	static OSType types[] = {TEXT_FILETYPE,PS_FILTER_FILETYPE};
	HINSTANCE hShellRes;
	InternalState bakState;

	switch(item){
#ifdef MAC_ENV
	case ok:
	case cancel:
#else
	case IDOK:
	case IDCANCEL:
#endif
		dispose_preview();
		return false; // end dialog
	case OPENITEM:
	{
		TCHAR* tmp1;
		TCHAR* filters, *title;
		Boolean loadDlgRet;

		showDialogAgain:

		title = (TCHAR*)malloc(1024);
		if (title == NULL) return false;

		filters = (TCHAR*)malloc(4096);
		if (filters == NULL) return false;
		memset(filters, 0, 4096);
		tmp1 = filters;

		FF_GetMsg(title, MSG_LOAD_FILTER_SETTINGS_TITLE_ID);

		strcpy_advance_id(&tmp1, MSG_ALL_SUPPORTED_FILES_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.afs, *.8bf, *.pff, *.prm, *.bin, *.rsrc, *.txt, *.ffx, *.ffl, *.guf)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.afs;*.8bf;*.pff;*.prm;*.bin;*.rsrc;*.txt;*.ffx;*.ffl;*.guf")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_AFS_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.afs)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.afs")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_TXT_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.txt)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.txt")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_8BF_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.8bf)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.8bf")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_PFF_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.pff)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.pff")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_PRM_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.prm)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.prm")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_RSRC_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.bin, *.rsrc)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.bin;*.rsrc")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_FFX_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.ffx)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.ffx")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_FFL_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.ffl)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.ffl")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_OPEN_GUF_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.guf)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.guf")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_ALL_FILES_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.*)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.*")); tmp1++;

		loadDlgRet = !gdata->parm.standalone && choosefiletypes(
#ifdef MAC_ENV
			"\pChoose filter settings", // "\p" means "Pascal string" // TODO (Not important yet): TRANSLATE
			&sfr, &reply, types, 2,
			filters
#else
			title, &sfr, &reply, types, 2,
			filters, gdata->hWndMainDlg
#endif
		);

		free(filters);
		free(title);

		if (loadDlgRet) {
			FFLoadingResult res;

			// Backup everything, otherwise we might lose parameter data if the loading fails
			bakState = saveInternalState();

			if (LOADING_OK == (res = loadfile(&sfr))) {
				updatedialog(dp);
				maindlgupdate(dp);
			}
			else {
				// Restore
				restoreInternalState(bakState);

				if (res == MSG_FFL_CONVERTED_ID) {
					showmessage_id(res);
					//return maindlgitem(dp, item); // call open Dialog again
					goto showDialogAgain;
				}
				else {
					TCHAR* reason = FF_GetMsg_Cpy(res);
					alertuser_id(MSG_CANNOT_LOAD_SETTINGS_ID, reason);
					FF_GetMsg_Free(reason);
				}
			}
		}
		break;
	}
	case SAVEITEM:
	{
		TCHAR* tmp1;
		TCHAR* filters, *title;
		Boolean saveDlgRet;

		title = (TCHAR*)malloc(1024);
		if (title == NULL) return false;

		filters = (TCHAR*)malloc(4096);
		if (filters == NULL) return false;
		memset(filters, 0, 4096);
		tmp1 = filters;

		FF_GetMsg(title, MSG_SAVE_FILTER_SETTINGS_TITLE_ID);

		strcpy_advance_id(&tmp1, MSG_ALL_SUPPORTED_FILES_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.afs, *.pff, *.txt, *.guf)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.afs;*.pff;*.txt;*.guf")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_SAVE_AFS_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.afs)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.afs")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_SAVE_PFF_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.pff)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.pff")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_SAVE_TXT_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.txt)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.txt")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_SAVE_GUF_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.guf)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.guf")); tmp1++;

		strcpy_advance_id(&tmp1, MSG_ALL_FILES_ID);
		strcpy_advance(&tmp1, (TCHAR*)TEXT(" (*.*)")); tmp1++;
		strcpy_advance(&tmp1, (TCHAR*)TEXT("*.*")); tmp1++;

		saveDlgRet = !gdata->parm.standalone && putfile(
#ifdef MAC_ENV
			"\pSave filter settings", // "\p" means "Pascal string" // TODO (Not important yet): TRANSLATE
			"\0",
			TEXT_FILETYPE, SIG_SIMPLETEXT, &reply, &sfr,
			"afs",
			filters, 1
#else
			title,
			TEXT("\0"),
			TEXT_FILETYPE, SIG_SIMPLETEXT, &reply, &sfr,
			TEXT("afs"),
			filters, 1, gdata->hWndMainDlg
#endif
		);

		free(filters);
		free(title);

		if (saveDlgRet) {
			FFSavingResult saveres = savefile_afs_pff_picotxt_guf(&sfr);
			if (saveres != SAVING_OK) {
				TCHAR* reason = FF_GetMsg_Cpy(saveres);
				alertuser_id(MSG_CANNOT_SAVE_SETTINGS_ID, reason);
				FF_GetMsg_Free(reason);
			}
			else {
				completesave(&reply);

				if (fileHasExtension(&sfr, TEXT(".txt"))) {
					showmessage_id(MSG_PICO_SAVED_ID);

					#ifdef MAC_ENV
					// TODO: Open text file instead
					showmessage_id(MSG_PLEASE_EDIT_MANUALLY_ID);
					#else
					hShellRes = ShellExecute(
						gdata->hWndMainDlg,
						TEXT("open"),
						&sfr.sfFile.szName[0],
						NULL,
						NULL,
						SW_SHOWNORMAL
					);
					if (hShellRes <= (HINSTANCE)32) {
						// MSDN states: "If the function succeeds, it returns a value greater than 32."

						TCHAR s[0x300];
						xstrcpy(s, (TCHAR*)TEXT("ShellExecute failed: ")); // TODO (Not so important): TRANSLATE
						FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), 0, s + xstrlen(s), 0x300 - (DWORD)xstrlen(s), NULL);
						simplealert(&s[0]);

						showmessage_id(MSG_PLEASE_EDIT_MANUALLY_ID);
					}
					#endif
				}

			}
		}

		break;
	}
	case MAKEITEM:
		if (gdata->parm.standalone) return true; // should not happen since the button should be grayed out

		builddialog(gpb);

		break;
	case HELPITEM:
		#ifdef MAC_ENV
		// TODO: Open web-browser instead
		showmessage_id(MSG_FIND_DOKU_HERE_ID);
		#else
		hShellRes = ShellExecute(
			gdata->hWndMainDlg,
			TEXT("open"),
			TEXT("https://github.com/danielmarschall/filter_foundry/blob/master/doc/The%20Filter%20Foundry.pdf"),
			NULL,
			NULL,
			SW_SHOWNORMAL
		);
		if (hShellRes == (HINSTANCE)ERROR_FILE_NOT_FOUND) {
			// On Win98 we get ERROR_FILE_NOT_FOUND, but the browser still opens!
			// So we ignore it for now...
		}
		else if (hShellRes <= (HINSTANCE)32) {
			// MSDN states: "If the function succeeds, it returns a value greater than 32."

			TCHAR s[0x300];
			xstrcpy(s, (TCHAR*)TEXT("ShellExecute failed: ")); // TODO (Not so important): TRANSLATE
			FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), 0, s + xstrlen(s), 0x300 - (DWORD)xstrlen(s), NULL);
			simplealert(&s[0]);

			showmessage_id(MSG_FIND_DOKU_HERE_ID);
		}
		#endif
		break;
	case ZOOMINITEM:
		zoomfactor = zoomfactor > 2. ? zoomfactor/2. : 1.;
		updatezoom(dp);
		previewerr = false;
		recalc_preview(gpb,dp);
		break;
	case ZOOMOUTITEM:
		zoomfactor *= 2.;
		if(zoomfactor > fitzoom)
			zoomfactor = fitzoom;
		updatezoom(dp);
		previewerr = false;
		recalc_preview(gpb,dp);
		break;
	case ZOOMLEVELITEM:
		zoomfactor = zoomfactor > 1. ? 1. : (fitzoom < 1. ? 1. : fitzoom);
		updatezoom(dp);
		previewerr = false;
		recalc_preview(gpb,dp);
		break;
	case FIRSTCTLITEM:
	case FIRSTCTLITEM+1:
	case FIRSTCTLITEM+2:
	case FIRSTCTLITEM+3:
	case FIRSTCTLITEM+4:
	case FIRSTCTLITEM+5:
	case FIRSTCTLITEM+6:
	case FIRSTCTLITEM+7:
		slidermoved(dp,item);
		recalc_preview(gpb,dp);
		break;
	case FIRSTCTLTEXTITEM:
	case FIRSTCTLTEXTITEM+1:
	case FIRSTCTLTEXTITEM+2:
	case FIRSTCTLTEXTITEM+3:
	case FIRSTCTLTEXTITEM+4:
	case FIRSTCTLTEXTITEM+5:
	case FIRSTCTLTEXTITEM+6:
	case FIRSTCTLTEXTITEM+7:
		slidertextchanged(dp,item);
		recalc_preview(gpb,dp);
		break;
	case FIRSTICONITEM:
	case FIRSTICONITEM+1:
	case FIRSTICONITEM+2:
	case FIRSTICONITEM+3:
		item -= FIRSTICONITEM;
		{
			simplealert(err[item]);
		}
		SELECTCTLTEXT(dp,FIRSTEXPRITEM+item,errstart[item],errpos[item]);
		break;
	case FIRSTEXPRITEM:
	case FIRSTEXPRITEM+1:
	case FIRSTEXPRITEM+2:
	case FIRSTEXPRITEM+3:
		if((item-FIRSTEXPRITEM) < nplanes){
			updateexpr(dp,item);
			maindlgupdate(dp);
		}
		break;
	}

	return true; // keep going
}

Boolean alertuser(TCHAR *err,TCHAR *more){
	TCHAR *s, *q;
	Boolean res;
	size_t i;

	if (more == NULL) {
		return simplealert(err);
	}

	s = (TCHAR*)malloc((xstrlen(err) + xstrlen(more) + 3) * sizeof(TCHAR)); // 3=CR+LF+NUL
	if (s == NULL) return false;

	q = s;

	for (i = 0; i < xstrlen(err); i++) {
		*q++ = err[i];
	}

	#ifdef WIN_ENV
	*q++ = CR;
	#endif
	*q++ = LF;

	for (i = 0; i < xstrlen(more); i++) {
		*q++ = more[i];
	}

	*q++ = 0;

	res = simplealert(s);
	free(s);
	return res;
}

Boolean alertuser_id(int MsgId, TCHAR* more) {
	TCHAR msg[1000];
	FF_GetMsg(&msg[0], MsgId);
	return alertuser(&msg[0], more);
}

Boolean simplealert_id(int MsgId) {
	TCHAR msg[1000];
	FF_GetMsg(&msg[0], MsgId);
	return simplealert(&msg[0]);
}

Boolean simplewarning_id(int MsgId) {
	TCHAR msg[1000];
	FF_GetMsg(&msg[0], MsgId);
	return simplewarning(&msg[0]);
}

Boolean showmessage_id(int MsgId) {
	TCHAR msg[1000];
	FF_GetMsg(&msg[0], MsgId);
	return showmessage(&msg[0]);
}