/* Ui.cpp
 *
 * Copyright (C) 1992-2011 Paul Boersma
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * pb 2002/03/07 GPL
 * pb 2002/03/30 less object-oriented
 * pb 2003/03/09 simplified calls of numeric expressions
 * pb 2003/05/19 Melder_atof
 * pb 2003/09/16 "standards" rather than "defaults"
 * pb 2004/05/09 no colons after ellipses
 * pb 2004/11/16 added Apply button
 * pb 2004/12/06 UiForm_getXXX_check
 * pb 2004/12/14 less space after LABEL unless its value is empty or ends in a period
 * pb 2005/03/06 guard against incorrect prefs files
 * pb 2006/10/28 erased MacOS 9 stuff
 * pb 2007/03/23 new Editor API
 * pb 2007/04/23 moved allowExecutionHook installation from UiForm_finish to UiForm_do,
 *   so that scripts cannot prevent this hook from working
 * pb 2007/06/09 wchar_t
 * pb 2007/08/12 wchar_t
 * pb 2007/12/30 Gui
 * pb 2009/01/04 UiForm_widgetsToValues ()
 * pb 2009/01/05 pause forms (e.g. Revert button)
 * pb 2009/01/18 Interpreter argument to UiForm callbacks
 * pb 2009/01/19 multiple Continue buttons in pause forms
 * pb 2009/03/09 UI_REAL_OR_UNDEFINED
 * pb 2009/03/21 removed enums
 * pb 2009/05/09 pink
 * pb 2009/08/21 better message for "You interrupted"
 * pb 2009/10/15 corrected colon removal
 * pb 2009/12/14 colours
 * pb 2009/12/22 invokingButtonTitle
 * fb 2010/02/23 GTK
 * fb 2010/03/01 GTK
 * pb 2010/12/07 channel
 * pb 2011/02/01 cancelContinueButton
 * pb 2011/02/20 better messages
 * pb 2011/03/18 C++
 */

#include <wctype.h>
#include <ctype.h>
#include "longchar.h"
#include "machine.h"
#include "Gui.h"
#include "Collection.h"
#include "UiP.h"
#include "Editor.h"
#include "Graphics.h"   /* colours. */

#define MAXIMUM_NUMBER_OF_FIELDS  50
#define MAXIMUM_NUMBER_OF_CONTINUE_BUTTONS  10

/***** class UiField: the things that have values in an UiForm dialog *****/

/* Values for 'type'. */
#define UI_REAL  1
#define UI_REAL_OR_UNDEFINED  2
#define UI_POSITIVE  3
#define UI_INTEGER  4
#define UI_NATURAL  5
#define UI_WORD  6
#define UI_SENTENCE  7
#define UI_COLOUR  8
#define UI_CHANNEL  9
	#define UI_LABELLEDTEXT_MIN  UI_REAL
	#define UI_LABELLEDTEXT_MAX  UI_CHANNEL
#define UI_LABEL  10
#define UI_TEXT  11
#define UI_BOOLEAN  12
#define UI_RADIO  13
#define UI_OPTIONMENU  14
#define UI_LIST  15

#define UiField_members Thing_members \
	int type; \
	const wchar_t *formLabel; \
	double realValue, realDefaultValue; \
	long integerValue, integerDefaultValue; \
	wchar_t *stringValue; const wchar_t *stringDefaultValue; \
	Graphics_Colour colourValue; \
	char *stringValueA; \
	Ordered options; \
	long numberOfStrings; \
	const wchar_t **strings; \
	GuiObject text, toggle, list, cascadeButton; \
	int y;
#define UiField_methods Thing_methods
class_create (UiField, Thing);

static void classUiField_destroy (I) {
	iam (UiField);
	Melder_free (my formLabel);
	Melder_free (my stringValue);
	Melder_free (my stringValueA);
	Melder_free (my stringDefaultValue);
	forget (my options);
	inherited (UiField) destroy (me);
}

class_methods (UiField, Thing) {
	class_method_local (UiField, destroy)
	class_methods_end
}

static UiField UiField_create (int type, const wchar_t *name) {
	UiField me = Thing_new (UiField);
	wchar_t shortName [101], *p;
	my type = type;
	my formLabel = Melder_wcsdup_f (name);
	wcscpy (shortName, name);
	/*
	 * Strip parentheses and colon off parameter name.
	 */
	//p = wcschr (shortName, ':');   /* ppgb 20101015: no idea why this used to be here */
	//if (p) *p = '\0';
	if ((p = (wchar *) wcschr (shortName, '(')) != NULL) {
		*p = '\0';
		if (p - shortName > 0 && p [-1] == ' ') p [-1] = '\0';
	}
	p = shortName;
	if (*p != '\0' && p [wcslen (p) - 1] == ':') p [wcslen (p) - 1] = '\0';
	Thing_setName (me, shortName);
	return me;
}

/***** class UiOption: radio buttons and menu options *****/

#define UiOption_members Thing_members \
	GuiObject toggle;
#define UiOption_methods Thing_methods
class_create (UiOption, Thing);

class_methods (UiOption, Thing) {
class_methods_end }

static Any UiOption_create (const wchar_t *label) {
	UiOption me = Thing_new (UiOption);
	Thing_setName (me, label);
	return me;
}

static void gui_radiobutton_cb_toggled (I, GuiRadioButtonEvent event) {
	#if !gtk
	iam (UiField);
	for (int i = 1; i <= my options -> size; i ++) {
		UiOption b = static_cast <UiOption> (my options -> item [i]);
		GuiRadioButton_setValue (b -> toggle, b -> toggle == event -> toggle);
	}
	#endif
}

Any UiRadio_addButton (I, const wchar_t *label) {
	iam (UiField);
	UiOption thee;
	if (me == NULL) return NULL;
	Melder_assert (my type == UI_RADIO || my type == UI_OPTIONMENU);
	thee = static_cast <UiOption> (UiOption_create (label));
	Collection_addItem (my options, thee);
	return thee;
}

#if motif
// TODO: Ik denk dat dit Native GTK gedrag is (als dit alleen het label update)
static void cb_optionChanged (GuiObject w, XtPointer void_me, XtPointer call) {
	iam (UiField);
	(void) call;
	for (int i = 1; i <= my options -> size; i ++) {
		UiOption b = static_cast <UiOption> (my options -> item [i]);
		#if motif
		if (b -> toggle == w) {
			XtVaSetValues (my cascadeButton, motif_argXmString (XmNlabelString, Melder_peekWcsToUtf8 (b -> name)), NULL);
			XmToggleButtonSetState (b -> toggle, TRUE, FALSE);
			if (Melder_debug == 11) {
				Melder_warning4 (Melder_integer (i), L" \"", b -> name, L"\"");
			}
		} else {
			XmToggleButtonSetState (b -> toggle, FALSE, FALSE);
		}
		#endif
	}
}
#endif

Any UiOptionMenu_addButton (I, const wchar_t *label) {
	iam (UiField);
	UiOption thee;
	if (me == NULL) return NULL;
	Melder_assert (my type == UI_RADIO || my type == UI_OPTIONMENU);
	thee = static_cast <UiOption> (UiOption_create (label));
	Collection_addItem (my options, thee);
	return thee;
}

/***** Things to do with UiField objects. *****/

static void UiField_setDefault (UiField me) {
	switch (my type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: case UI_INTEGER: case UI_NATURAL:
			case UI_WORD: case UI_SENTENCE: case UI_COLOUR: case UI_CHANNEL: case UI_TEXT:
		{
			GuiText_setString (my text, my stringDefaultValue);
		} break; case UI_BOOLEAN: {
			GuiCheckButton_setValue (my toggle, my integerDefaultValue);
		} break; case UI_RADIO: {
			for (int i = 1; i <= my options -> size; i ++) {
				UiOption b = static_cast <UiOption> (my options -> item [i]);
				GuiRadioButton_setValue (b -> toggle, i == my integerDefaultValue);
			}
		} break; case UI_OPTIONMENU: {
			#if gtk
				gtk_combo_box_set_active (GTK_COMBO_BOX (my cascadeButton), (my integerDefaultValue - 1));
			#elif motif
				for (int i = 1; i <= my options -> size; i ++) {
					UiOption b = static_cast <UiOption> (my options -> item [i]);
					XmToggleButtonSetState (b -> toggle, i == my integerDefaultValue, False);
					if (i == my integerDefaultValue) {
						XtVaSetValues (my cascadeButton, motif_argXmString (XmNlabelString, Melder_peekWcsToUtf8 (b -> name)), NULL);
					}
				}
			#endif
		} break; case UI_LIST: {
			GuiList_selectItem (my list, my integerDefaultValue);
		}
	}
}

static int colourToValue (UiField me, wchar_t *string) {
	wchar_t *p = string;
	while (*p == ' ' || *p == '\t') p ++;
	*p = tolower (*p);
	int first = *p;
	if (first == '{') {
		my colourValue. red = Melder_atof (++ p);
		p = (wchar *) wcschr (p, ',');
		if (p == NULL) return 0;
		my colourValue. green = Melder_atof (++ p);
		p = (wchar *) wcschr (p, ',');
		if (p == NULL) return 0;
		my colourValue. blue = Melder_atof (++ p);
	} else {
		*p = tolower (*p);
		if (wcsequ (p, L"black")) my colourValue = Graphics_BLACK;
		else if (wcsequ (p, L"white")) my colourValue = Graphics_WHITE;
		else if (wcsequ (p, L"red")) my colourValue = Graphics_RED;
		else if (wcsequ (p, L"green")) my colourValue = Graphics_GREEN;
		else if (wcsequ (p, L"blue")) my colourValue = Graphics_BLUE;
		else if (wcsequ (p, L"yellow")) my colourValue = Graphics_YELLOW;
		else if (wcsequ (p, L"cyan")) my colourValue = Graphics_CYAN;
		else if (wcsequ (p, L"magenta")) my colourValue = Graphics_MAGENTA;
		else if (wcsequ (p, L"maroon")) my colourValue = Graphics_MAROON;
		else if (wcsequ (p, L"lime")) my colourValue = Graphics_LIME;
		else if (wcsequ (p, L"navy")) my colourValue = Graphics_NAVY;
		else if (wcsequ (p, L"teal")) my colourValue = Graphics_TEAL;
		else if (wcsequ (p, L"purple")) my colourValue = Graphics_PURPLE;
		else if (wcsequ (p, L"olive")) my colourValue = Graphics_OLIVE;
		else if (wcsequ (p, L"pink")) my colourValue = Graphics_PINK;
		else if (wcsequ (p, L"silver")) my colourValue = Graphics_SILVER;
		else if (wcsequ (p, L"grey")) my colourValue = Graphics_GREY;
		else { *p = first; return 0; }
		*p = first;
	}
	return 1;
}

static int UiField_widgetToValue (UiField me) {
	switch (my type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
			wchar_t *dirty = GuiText_getString (my text);   /* The text as typed by the user. */
			if (! Interpreter_numericExpression (NULL, dirty, & my realValue)) { Melder_free (dirty); return 0; }
			Melder_free (dirty);
			/*
			 * Put a clean version of the new value in the form.
			 * If the value is equal to the default, make sure that any default comments are included.
			 */
			if (my realValue == Melder_atof (my stringDefaultValue)) {
				GuiText_setString (my text, my stringDefaultValue);
			} else {
				wchar_t clean [40];
				wcscpy (clean, Melder_double (my realValue));
				/*
				 * If the default is overtly real, the shown value must be as well.
				 */
				if ((wcschr (my stringDefaultValue, '.') || wcschr (my stringDefaultValue, 'e')) &&
					! (wcschr (clean, '.') || wcschr (clean, 'e')))
				{
					wcscat (clean, L".0");
				}
				GuiText_setString (my text, clean);
			}
			if (my realValue == NUMundefined && my type != UI_REAL_OR_UNDEFINED)
				return Melder_error3 (L"`", my name, L"' has the value \"undefined\".");
			if (my type == UI_POSITIVE && my realValue <= 0.0)
				return Melder_error3 (L"`", my name, L"' must be greater than 0.0.");
		} break; case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: {
			wchar_t *dirty = GuiText_getString (my text);
			if (my type == UI_CHANNEL && (wcsequ (dirty, L"Left") || wcsequ (dirty, L"Mono"))) {
				my integerValue = 1;
			} else if (my type == UI_CHANNEL && (wcsequ (dirty, L"Right") || wcsequ (dirty, L"Stereo"))) {
				my integerValue = 2;
			} else {
				double realValue;
				if (! Interpreter_numericExpression (NULL, dirty, & realValue)) { Melder_free (dirty); return 0; }
				my integerValue = floor (realValue + 0.5);
			}
			Melder_free (dirty);
			if (my integerValue == wcstol (my stringDefaultValue, NULL, 10)) {
				GuiText_setString (my text, my stringDefaultValue);
			} else {
				GuiText_setString (my text, Melder_integer (my integerValue));
			}
			if (my type == UI_NATURAL && my integerValue < 1)
				return Melder_error3 (L"`", my name, L"' must be a positive whole number.");
		} break; case UI_WORD: {
			Melder_free (my stringValue);
			my stringValue = GuiText_getString (my text);
			wchar_t *p = my stringValue;
			while (*p != '\0') { if (*p == ' ' || *p == '\t') *p = '\0'; p ++; }
			GuiText_setString (my text, my stringValue);
		} break; case UI_SENTENCE: case UI_TEXT: {
			Melder_free (my stringValue);
			my stringValue = GuiText_getString (my text);
		} break; case UI_BOOLEAN: {
			my integerValue = GuiCheckButton_getValue (my toggle);
		} break; case UI_RADIO: {
			my integerValue = 0;
			for (int i = 1; i <= my options -> size; i ++) {
				UiOption b = static_cast <UiOption> (my options -> item [i]);
				if (GuiRadioButton_getValue (b -> toggle))
					my integerValue = i;
			}
			if (my integerValue == 0)
				return Melder_error3 (L"No option chosen for `", my name, L"'.");
		} break; case UI_OPTIONMENU: {
			my integerValue = 0;
			#if gtk
				// TODO: Graag even een check :)
				my integerValue = gtk_combo_box_get_active (GTK_COMBO_BOX (my cascadeButton)) + 1;
			#elif motif
			for (int i = 1; i <= my options -> size; i ++) {
				UiOption b = static_cast <UiOption> (my options -> item [i]);
				if (XmToggleButtonGetState (b -> toggle))
					my integerValue = i;
			}
			#endif
			if (my integerValue == 0)
				return Melder_error3 (L"No option chosen for `", my name, L"'.");
		} break; case UI_LIST: {
			long numberOfSelected, *selected = GuiList_getSelectedPositions (my list, & numberOfSelected);   // BUG memory
			if (selected == NULL) {
				Melder_warning1 (L"No items selected.");
				my integerValue = 1;
			} else {
				if (numberOfSelected > 1) Melder_warning1 (L"More than one item selected.");
				my integerValue = selected [1];
				NUMvector_free <long> (selected, 1);
			}
		} break; case UI_COLOUR: {
			wchar_t *string = GuiText_getString (my text);
			if (colourToValue (me, string)) {
				Melder_free (string);
			} else if (Interpreter_numericExpression (NULL, string, & my colourValue. red)) {
				my colourValue. green = my colourValue. blue = my colourValue. red;
				Melder_free (string);
			} else {
				Melder_free (string);
				return 0;
			}
		}
	}
	return 1;
}

static int UiField_stringToValue (UiField me, const wchar_t *string, Interpreter interpreter) {
	switch (my type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
			if (wcsspn (string, L" \t") == wcslen (string))
				return Melder_error3 (L"Argument `", my name, L"' empty.");
			if (! Interpreter_numericExpression (interpreter, string, & my realValue)) return 0;
			if (my realValue == NUMundefined && my type != UI_REAL_OR_UNDEFINED)
				return Melder_error3 (L"`", my name, L"' has the value \"undefined\".");
			if (my type == UI_POSITIVE && my realValue <= 0.0)
				return Melder_error3 (L"`", my name, L"' must be greater than 0.");
		} break; case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: {
			if (wcsspn (string, L" \t") == wcslen (string))
				return Melder_error3 (L"Argument `", my name, L"' empty.");
			if (my type == UI_CHANNEL && (wcsequ (string, L"All") || wcsequ (string, L"Average"))) {
				my integerValue = 0;
			} else if (my type == UI_CHANNEL && (wcsequ (string, L"Left") || wcsequ (string, L"Mono"))) {
				my integerValue = 1;
			} else if (my type == UI_CHANNEL && (wcsequ (string, L"Right") || wcsequ (string, L"Stereo"))) {
				my integerValue = 2;
			} else {
				double realValue;
				if (! Interpreter_numericExpression (interpreter, string, & realValue)) return 0;
				my integerValue = floor (realValue + 0.5);
			}
			if (my type == UI_NATURAL && my integerValue < 1)
				return Melder_error3 (L"`", my name, L"' must be a positive whole number.");
		} break; case UI_WORD: case UI_SENTENCE: case UI_TEXT: {
			Melder_free (my stringValue);
			my stringValue = Melder_wcsdup_f (string);
		} break; case UI_BOOLEAN: {
			if (! string [0]) return Melder_error1 (L"Empty argument for toggle button.");
			my integerValue = string [0] == '1' || string [0] == 'y' || string [0] == 'Y' ||
				string [0] == 't' || string [0] == 'T';
		} break; case UI_RADIO: case UI_OPTIONMENU: {
			my integerValue = 0;
			for (int i = 1; i <= my options -> size; i ++) {
				UiOption b = static_cast <UiOption> (my options -> item [i]);
				if (wcsequ (string, b -> name))
					my integerValue = i;
			}
			if (my integerValue == 0) {
				/*
				 * Retry with different case.
				 */
				for (int i = 1; i <= my options -> size; i ++) {
					UiOption b = static_cast <UiOption> (my options -> item [i]);
					wchar_t name2 [100];
					wcscpy (name2, b -> name);
					if (islower (name2 [0])) name2 [0] = toupper (name2 [0]);
					else if (isupper (name2 [0])) name2 [0] = tolower (name2 [0]);
					if (wcsequ (string, name2))
						my integerValue = i;
				}
			}
			if (my integerValue == 0) {
				return Melder_error5
					(L"Field `", my name, L"' cannot have the value \"", string, L"\".");
			}
		} break; case UI_LIST: {
			long i;
			for (i = 1; i <= my numberOfStrings; i ++)
				if (wcsequ (string, my strings [i])) break;
			if (i > my numberOfStrings) return Melder_error5
				(L"Field `", my name, L"' cannot have the value \"", string, L"\".");
			my integerValue = i;
		} break; case UI_COLOUR: {
			wchar_t *string2 = Melder_wcsdup_f (string);
			if (colourToValue (me, string2)) {
				Melder_free (string2);
			} else if (Interpreter_numericExpression (interpreter, string2, & my colourValue. red)) {
				my colourValue. green = my colourValue. blue = my colourValue. red;
				Melder_free (string2);
			} else {
				Melder_free (string2);
				return 0;
			}
		} break; default: {
			return 0;
		}
	}
	return 1;
}

/***** History mechanism. *****/

static MelderString theHistory = { 0 };
void UiHistory_write (const wchar_t *string) { MelderString_append (& theHistory, string); }
wchar_t *UiHistory_get (void) { return theHistory.string; }
void UiHistory_clear (void) { MelderString_empty (& theHistory); }

/***** class UiForm: dialog windows *****/

int (*theAllowExecutionHookHint) (void *closure) = NULL;
void *theAllowExecutionClosureHint = NULL;

void Ui_setAllowExecutionHook (int (*allowExecutionHook) (void *closure), void *allowExecutionClosure) {
	theAllowExecutionHookHint = allowExecutionHook;
	theAllowExecutionClosureHint = allowExecutionClosure;
}

#define UiForm_members Thing_members \
	EditorCommand command; \
	GuiObject parent, shell, dialog; \
	int (*okCallback) (UiForm sendingForm, const wchar_t *sendingString, Interpreter interpreter, const wchar_t *invokingButtonTitle, bool modified, void *closure); \
	int (*applyCallback) (Any dia, void *closure); \
	int (*cancelCallback) (Any dia, void *closure); \
	void *buttonClosure; \
	const wchar_t *invokingButtonTitle, *helpTitle; \
	int numberOfContinueButtons, defaultContinueButton, cancelContinueButton, clickedContinueButton; \
	const wchar_t *continueTexts [1 + MAXIMUM_NUMBER_OF_CONTINUE_BUTTONS]; \
	int numberOfFields; \
	UiField field [1 + MAXIMUM_NUMBER_OF_FIELDS]; \
	GuiObject okButton, cancelButton, revertButton, helpButton, applyButton, continueButtons [1 + MAXIMUM_NUMBER_OF_CONTINUE_BUTTONS]; \
	bool destroyWhenUnmanaged, isPauseForm; \
	int (*allowExecutionHook) (void *closure); \
	void *allowExecutionClosure;
#define UiForm_methods Thing_methods
class_create_opaque (UiForm, Thing);

static void classUiForm_destroy (I) {
	iam (UiForm);
	for (int ifield = 1; ifield <= my numberOfFields; ifield ++)
		forget (my field [ifield]);
	if (my dialog) {
		GuiObject_destroy (GuiObject_parent (my dialog));
	}
	Melder_free (my invokingButtonTitle);
	Melder_free (my helpTitle);
	inherited (UiForm) destroy (me);
}

class_methods (UiForm, Thing) {
	class_method_local (UiForm, destroy)
	class_methods_end
}

static void gui_button_cb_revert (I, GuiButtonEvent event) {
	(void) event;
	iam (UiForm);
	for (int ifield = 1; ifield <= my numberOfFields; ifield ++)
		UiField_setDefault (my field [ifield]);
}

static void gui_dialog_cb_close (I) {
	iam (UiForm);
	if (my cancelCallback) my cancelCallback (me, my buttonClosure);
	GuiObject_hide (my dialog);
	if (my destroyWhenUnmanaged) forget (me);
}
static void gui_button_cb_cancel (I, GuiButtonEvent event) {
	(void) event;
	iam (UiForm);
	if (my cancelCallback) my cancelCallback (me, my buttonClosure);
	GuiObject_hide (my dialog);
	if (my destroyWhenUnmanaged) forget (me);
}

int UiForm_widgetsToValues (I) {
	iam (UiForm);
	for (int ifield = 1; ifield <= my numberOfFields; ifield ++) {
		if (! UiField_widgetToValue (my field [ifield])) {
			return Melder_error3 (L"Please correct command window " L_LEFT_DOUBLE_QUOTE, my name, L_RIGHT_DOUBLE_QUOTE L" or cancel.");
		}
	}
	return 1;
}

static void UiForm_okOrApply (I, GuiObject button, int hide) {
	iam (UiForm);
	if (my allowExecutionHook && ! my allowExecutionHook (my allowExecutionClosure)) {
		Melder_error3 (L"Cannot execute command window " L_LEFT_DOUBLE_QUOTE, my name, L_RIGHT_DOUBLE_QUOTE L".");
		Melder_flushError (NULL);
		return;
	}
	if (! UiForm_widgetsToValues (me)) {
		Melder_flushError (NULL);
		return;
	}
	/* In the next, w must become my okButton? */
	/*XtRemoveCallback (w, XmNactivateCallback, UiForm_ok, void_me);   /* FIX */
	if (my okButton) GuiObject_setSensitive (my okButton, false);
	for (int i = 1; i <= my numberOfContinueButtons; i ++) if (my continueButtons [i]) GuiObject_setSensitive (my continueButtons [i], false);
	if (my applyButton) GuiObject_setSensitive (my applyButton, false);
	if (my cancelButton) GuiObject_setSensitive (my cancelButton, false);
	if (my revertButton) GuiObject_setSensitive (my revertButton, false);
	if (my helpButton) GuiObject_setSensitive (my helpButton, false);
	#if motif
	XmUpdateDisplay (my dialog);
	#endif
	if (my isPauseForm) {
		for (int i = 1; i <= my numberOfContinueButtons; i ++) {
			if (button == my continueButtons [i]) {
				my clickedContinueButton = i;
			}
		}
	}
	/*
	 * Keep the gate for error handling.
	 */
	try {
		my okCallback (me, NULL, NULL, NULL, false, my buttonClosure); therror
		/*
		 * Write everything to history. Before destruction!
		 */
		if (! my isPauseForm) {
			UiHistory_write (L"\n");
			UiHistory_write (my invokingButtonTitle);
			int size = my numberOfFields;
			while (size >= 1 && my field [size] -> type == UI_LABEL)
				size --;   // ignore trailing fields without a value
			for (int ifield = 1; ifield <= size; ifield ++) {
				UiField field = my field [ifield];
				switch (field -> type) {
					case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
						UiHistory_write (L" ");
						UiHistory_write (Melder_double (field -> realValue));
					} break; case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: {
						UiHistory_write (L" ");
						UiHistory_write (Melder_integer (field -> integerValue));
					} break; case UI_WORD: case UI_SENTENCE: case UI_TEXT: {
						if (ifield < size && (field -> stringValue [0] == '\0' || wcschr (field -> stringValue, ' '))) {
							UiHistory_write (L" \"");
							UiHistory_write (field -> stringValue);   // BUG: should double any double quotes
							UiHistory_write (L"\"");
						} else {
							UiHistory_write (L" ");
							UiHistory_write (field -> stringValue);
						}
					} break; case UI_BOOLEAN: {
						UiHistory_write (field -> integerValue ? L" yes" : L" no");
					} break; case UI_RADIO: case UI_OPTIONMENU: {
						UiOption b = static_cast <UiOption> (field -> options -> item [field -> integerValue]);
						if (ifield < size && (b -> name [0] == '\0' || wcschr (b -> name, ' '))) {
							UiHistory_write (L" \"");
							UiHistory_write (b -> name);
							UiHistory_write (L"\"");
						} else {
							UiHistory_write (L" ");
							UiHistory_write (b -> name);
						}
					} break; case UI_LIST: {
						if (ifield < size && (field -> strings [field -> integerValue] [0] == '\0' || wcschr (field -> strings [field -> integerValue], ' '))) {
							UiHistory_write (L" \"");
							UiHistory_write (field -> strings [field -> integerValue]);
							UiHistory_write (L"\"");
						} else {
							UiHistory_write (L" ");
							UiHistory_write (field -> strings [field -> integerValue]);
						}
					} break; case UI_COLOUR: {
						UiHistory_write (L" ");
						UiHistory_write (Graphics_Colour_name (field -> colourValue));
					}
				}
			}
		}
		if (hide) {
			GuiObject_hide (my dialog);
			if (my destroyWhenUnmanaged) {
				forget (me);
				return;
			}
		}
	} catch (MelderError) {
		/*
		 * If a solution has already been suggested, or the "error" was actually a conscious user action, do not add anything more.
		 */
		if (! wcsstr (Melder_getError (), L"Please ") && ! wcsstr (Melder_getError (), L"You could ") &&
			! wcsstr (Melder_getError (), L"You interrupted "))
		{
			/*
			 * Otherwise, show a generic message.
			 */
			if (wcsstr (Melder_getError (), L"Selection changed!")) {
				Melder_error3 (L"Please change the selection in the object list, or click Cancel in the command window " L_LEFT_DOUBLE_QUOTE,
					my name, L_RIGHT_DOUBLE_QUOTE L".");
			} else {
				Melder_error3 (L"Please change something in the command window " L_LEFT_DOUBLE_QUOTE,
					my name, L_RIGHT_DOUBLE_QUOTE L", or click Cancel in that window.");
			}
		}
		/*XtAddCallback (w, XmNactivateCallback, UiForm_ok, void_me);   /* FIX */
		Melder_flushError (NULL);
	}
	if (my okButton) GuiObject_setSensitive (my okButton, true);
	for (int i = 1; i <= my numberOfContinueButtons; i ++) if (my continueButtons [i]) GuiObject_setSensitive (my continueButtons [i], true);
	if (my applyButton) GuiObject_setSensitive (my applyButton, true);
	if (my cancelButton) GuiObject_setSensitive (my cancelButton, true);
	if (my revertButton) GuiObject_setSensitive (my revertButton, true);
	if (my helpButton) GuiObject_setSensitive (my helpButton, true);
}

static void gui_button_cb_ok (I, GuiButtonEvent event) {
	(void) event;
	iam (UiForm);
	UiForm_okOrApply (me, event -> button, true);
}

static void gui_button_cb_apply (I, GuiButtonEvent event) {
	(void) event;
	iam (UiForm);
	UiForm_okOrApply (me, event -> button, false);
}

static void gui_button_cb_help (I, GuiButtonEvent event) {
	(void) event;
	iam (UiForm);
	Melder_help (my helpTitle);
}

UiForm UiForm_create (GuiObject parent, const wchar_t *title,
	int (*okCallback) (UiForm sendingForm, const wchar_t *sendingString, Interpreter interpreter, const wchar_t *invokingButtonTitle, bool modified, void *closure), void *buttonClosure,
	const wchar_t *invokingButtonTitle, const wchar_t *helpTitle)
{
	UiForm me = Thing_new (UiForm);
	my parent = parent;
	Thing_setName (me, title);
	my okCallback = okCallback;
	my buttonClosure = buttonClosure;
	my invokingButtonTitle = Melder_wcsdup_f (invokingButtonTitle);
	my helpTitle = Melder_wcsdup_f (helpTitle);
	return me;
}

void UiForm_setPauseForm (I,
	int numberOfContinueButtons, int defaultContinueButton, int cancelContinueButton,
	const wchar_t *continue1, const wchar_t *continue2, const wchar_t *continue3,
	const wchar_t *continue4, const wchar_t *continue5, const wchar_t *continue6,
	const wchar_t *continue7, const wchar_t *continue8, const wchar_t *continue9,
	const wchar_t *continue10,
	int (*cancelCallback) (Any dia, void *closure))
{
	iam (UiForm);
	my isPauseForm = true;
	my numberOfContinueButtons = numberOfContinueButtons;
	my defaultContinueButton = defaultContinueButton;
	my cancelContinueButton = cancelContinueButton;
	my continueTexts [1] = continue1;
	my continueTexts [2] = continue2;
	my continueTexts [3] = continue3;
	my continueTexts [4] = continue4;
	my continueTexts [5] = continue5;
	my continueTexts [6] = continue6;
	my continueTexts [7] = continue7;
	my continueTexts [8] = continue8;
	my continueTexts [9] = continue9;
	my continueTexts [10] = continue10;
	my cancelCallback = cancelCallback;
}

static int commonOkCallback (UiForm dia, const wchar_t *dummy, Interpreter interpreter, const wchar_t *invokingButtonTitle, bool modified, void *closure) {
	EditorCommand cmd = (EditorCommand) closure;
	(void) dia;
	(void) dummy;
	(void) invokingButtonTitle;
	(void) modified;
	return cmd -> commandCallback (cmd -> editor, cmd, static_cast <UiForm> (cmd -> dialog), NULL, interpreter);
}

UiForm UiForm_createE (EditorCommand cmd, const wchar_t *title, const wchar_t *invokingButtonTitle, const wchar_t *helpTitle) {
	Editor editor = (Editor) cmd -> editor;
	UiForm dia = UiForm_create (editor -> dialog, title, commonOkCallback, cmd, invokingButtonTitle, helpTitle);
	dia -> command = cmd;
	return dia;
}

static UiField UiForm_addField (UiForm me, int type, const wchar_t *label) {
	if (my numberOfFields == MAXIMUM_NUMBER_OF_FIELDS) return NULL;
	return my field [++ my numberOfFields] = UiField_create (type, label);
}

Any UiForm_addReal (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_REAL, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addRealOrUndefined (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_REAL_OR_UNDEFINED, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addPositive (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_POSITIVE, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addInteger (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_INTEGER, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addNatural (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_NATURAL, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addWord (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_WORD, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addSentence (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_SENTENCE, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addLabel (I, const wchar_t *name, const wchar_t *label) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_LABEL, name);
	if (thee == NULL) return NULL;
	thy stringValue = Melder_wcsdup_f (label);
	return thee;
}

Any UiForm_addBoolean (I, const wchar_t *label, int defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_BOOLEAN, label);
	if (thee == NULL) return NULL;
	thy integerDefaultValue = defaultValue;
	return thee;
}

Any UiForm_addText (I, const wchar_t *name, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_TEXT, name);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addRadio (I, const wchar_t *label, int defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_RADIO, label);
	if (thee == NULL) return NULL;
	thy integerDefaultValue = defaultValue;
	thy options = Ordered_create ();
	return thee;
}

Any UiForm_addOptionMenu (I, const wchar_t *label, int defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_OPTIONMENU, label);
	if (thee == NULL) return NULL;
	thy integerDefaultValue = defaultValue;
	thy options = Ordered_create ();
	return thee;
}

Any UiForm_addList (I, const wchar_t *label, long numberOfStrings, const wchar_t **strings, long defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_LIST, label);
	if (thee == NULL) return NULL;
	thy numberOfStrings = numberOfStrings;
	thy strings = strings;
	thy integerDefaultValue = defaultValue;
	return thee;
}

Any UiForm_addColour (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_COLOUR, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

Any UiForm_addChannel (I, const wchar_t *label, const wchar_t *defaultValue) {
	iam (UiForm);
	UiField thee = UiForm_addField (me, UI_CHANNEL, label);
	if (thee == NULL) return NULL;
	thy stringDefaultValue = Melder_wcsdup_f (defaultValue);
	return thee;
}

#define DIALOG_X  150
#define DIALOG_Y  70
#define HELP_BUTTON_WIDTH  60
#define STANDARDS_BUTTON_WIDTH  100
#define REVERT_BUTTON_WIDTH  60
#define STOP_BUTTON_WIDTH  50
#define HELP_BUTTON_X  20
#define LIST_HEIGHT  192

static MelderString theFinishBuffer = { 0 };

static void appendColon (void) {
	long length = theFinishBuffer.length;
	if (length < 1) return;
	wchar_t lastCharacter = theFinishBuffer.string [length - 1];
	if (lastCharacter == ':' || lastCharacter == '?' || lastCharacter == '.') return;
	MelderString_appendCharacter (& theFinishBuffer, ':');
}

void UiForm_finish (I) {
	iam (UiForm);
	if (! my parent && ! my isPauseForm) return;

	int size = my numberOfFields;
	int dialogHeight = 0, x = Gui_LEFT_DIALOG_SPACING, y;
	int textFieldHeight = Gui_TEXTFIELD_HEIGHT;
	int dialogWidth = 520, dialogCentre = dialogWidth / 2, fieldX = dialogCentre + Gui_LABEL_SPACING / 2;
	int labelWidth = fieldX - Gui_LABEL_SPACING - x, fieldWidth = labelWidth, halfFieldWidth = fieldWidth / 2 - 6;

	#if gtk
		GuiObject form, buttons;
		int numberOfRows = 0, row = 0;
	#else
		GuiObject form, buttons; // Define?
	#endif

	/*
		Compute height. Cannot leave this to the default geometry management system.
	*/
	for (long ifield = 1; ifield <= my numberOfFields; ifield ++ ) {
		UiField thee = my field [ifield], previous = my field [ifield - 1];
		dialogHeight +=
			ifield == 1 ? Gui_TOP_DIALOG_SPACING :
			thy type == UI_RADIO || previous -> type == UI_RADIO ? Gui_VERTICAL_DIALOG_SPACING_DIFFERENT :
			thy type >= UI_LABELLEDTEXT_MIN && thy type <= UI_LABELLEDTEXT_MAX && wcsnequ (thy name, L"right ", 6) &&
			previous -> type >= UI_LABELLEDTEXT_MIN && previous -> type <= UI_LABELLEDTEXT_MAX &&
			wcsnequ (previous -> name, L"left ", 5) ? - textFieldHeight : Gui_VERTICAL_DIALOG_SPACING_SAME;
		thy y = dialogHeight;
		dialogHeight +=
			thy type == UI_BOOLEAN ? Gui_CHECKBUTTON_HEIGHT :
			thy type == UI_RADIO ? thy options -> size * Gui_RADIOBUTTON_HEIGHT +
				(thy options -> size - 1) * Gui_RADIOBUTTON_SPACING :
			thy type == UI_OPTIONMENU ? Gui_OPTIONMENU_HEIGHT :
			thy type == UI_LIST ? LIST_HEIGHT :
			thy type == UI_LABEL && thy stringValue [0] != '\0' && thy stringValue [wcslen (thy stringValue) - 1] != '.' &&
				ifield != my numberOfFields ? textFieldHeight
				#ifdef _WIN32
					- 6 :
				#else
					- 10 :
				#endif
			textFieldHeight;
		#if gtk
			numberOfRows += wcsnequ (thy name, L"left ", 5);
		#endif
	}
	dialogHeight += 2 * Gui_BOTTOM_DIALOG_SPACING + Gui_PUSHBUTTON_HEIGHT;
	my dialog = GuiDialog_create (my parent, DIALOG_X, DIALOG_Y, dialogWidth, dialogHeight, my name, gui_dialog_cb_close, me, 0);

	#if gtk
		form = gtk_table_new (numberOfRows, 3, false);
		gtk_table_set_col_spacing (GTK_TABLE (form), 0, 5);
		gtk_container_add (GTK_CONTAINER (my dialog), form);
		gtk_widget_show (form);
		buttons = GTK_DIALOG (GuiObject_parent (my dialog)) -> action_area;
	#else
		form = my dialog;
		buttons = my dialog;
	#endif

	for (long ifield = 1; ifield <= size; ifield ++) {
		UiField field = my field [ifield];
		y = field -> y;
		switch (field -> type) {
			case UI_REAL:
			case UI_REAL_OR_UNDEFINED:
			case UI_POSITIVE:
			case UI_INTEGER:
			case UI_NATURAL:
			case UI_WORD:
			case UI_SENTENCE:
			case UI_COLOUR:
			case UI_CHANNEL:
			{
				int ylabel = y;
				#if defined (macintosh)
					ylabel += 3;
				#endif
				if (wcsnequ (field -> name, L"left ", 5)) {
					MelderString_copy (& theFinishBuffer, field -> formLabel + 5);
					appendColon ();
					GuiObject label = GuiLabel_createShown (form, x, x + labelWidth, ylabel, ylabel + textFieldHeight,
						theFinishBuffer.string, GuiLabel_RIGHT);
					#if gtk
						gtk_table_attach_defaults (GTK_TABLE (form), label, 0, 1, row, row + 1);
					#endif
					field -> text = GuiText_createShown (form, fieldX, fieldX + halfFieldWidth, y, Gui_AUTOMATIC, 0);
					#if gtk
						gtk_table_attach_defaults (GTK_TABLE (form), field -> text, 1, 2, row, row + 1);
					#endif
				} else if (wcsnequ (field -> name, L"right ", 6)) {
					field -> text = GuiText_createShown (form, fieldX + halfFieldWidth + 12, fieldX + fieldWidth,
						y, Gui_AUTOMATIC, 0);
					#if gtk
						gtk_table_attach_defaults (GTK_TABLE (form), field -> text, 2, 3, row, row + 1);
						row += 1;
					#endif
				} else {
					MelderString_copy (& theFinishBuffer, field -> formLabel);
					appendColon ();
					GuiObject label = GuiLabel_createShown (form, x, x + labelWidth,
						ylabel, ylabel + textFieldHeight,
						theFinishBuffer.string, GuiLabel_RIGHT);
					#if gtk
						gtk_table_attach_defaults (GTK_TABLE (form), label, 0, 1, row, row + 1);
					#endif
					field -> text = GuiText_createShown (form, fieldX, fieldX + fieldWidth, // or once the dialog is a Form: - Gui_RIGHT_DIALOG_SPACING,
						y, Gui_AUTOMATIC, 0);
					#if gtk
						gtk_table_attach_defaults (GTK_TABLE (form), field -> text, 1, 3, row, row + 1);
						row += 1;
					#endif
				}
			} break;
			case UI_TEXT:
			{
				field -> text = GuiText_createShown (form, x, x + dialogWidth - Gui_LEFT_DIALOG_SPACING - Gui_RIGHT_DIALOG_SPACING,
					y, Gui_AUTOMATIC, 0);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), field -> text, 0, 3, row, row + 1);
					row += 1;
				#endif
			} break;
			case UI_LABEL:
			{
				MelderString_copy (& theFinishBuffer, field -> stringValue);
				field -> text = GuiLabel_createShown (form,
					x, dialogWidth /* allow to extend into the margin */, y + 5, y + 5 + textFieldHeight,
					theFinishBuffer.string, 0);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), field -> text, 0, 3, row, row + 1);
					row += 1;
				#endif
			} break;
			case UI_RADIO:
			{
				int ylabel = y;
				#if gtk
					 void *group = NULL;
				#endif
				#if defined (macintosh)
					ylabel += 1;
				#endif
				MelderString_copy (& theFinishBuffer, field -> formLabel);
				appendColon ();
				GuiObject label = GuiLabel_createShown (form, x, x + labelWidth, ylabel, ylabel + Gui_RADIOBUTTON_HEIGHT,
					theFinishBuffer.string, GuiLabel_RIGHT);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), label, 0, 1, row, row + 1);
				#endif
				for (long ibutton = 1; ibutton <= field -> options -> size; ibutton ++) {
					UiOption button = static_cast <UiOption> (field -> options -> item [ibutton]);
					MelderString_copy (& theFinishBuffer, button -> name);
					button -> toggle = GuiRadioButton_createShown (form,
						fieldX, dialogWidth /* allow to extend into the margin */,
						y + (ibutton - 1) * (Gui_RADIOBUTTON_HEIGHT + Gui_RADIOBUTTON_SPACING), Gui_AUTOMATIC,
						theFinishBuffer.string, gui_radiobutton_cb_toggled, field, 0);
					#if gtk
						if (group != NULL) {
							GuiRadioButton_setGroup (button -> toggle, group);
						} 
						group = GuiRadioButton_getGroup (button -> toggle);
						gtk_table_attach_defaults (GTK_TABLE (form), button -> toggle, 1, 3, row, row + 1);
						row += 1;
					#endif
				}
			} break; 
			case UI_OPTIONMENU:
			{
				int ylabel = y;
				#if defined (macintosh)
					ylabel += 2;
				#endif
				GuiObject bar, box;
				MelderString_copy (& theFinishBuffer, field -> formLabel);
				appendColon ();
				GuiObject label = GuiLabel_createShown (form, x, x + labelWidth, ylabel, ylabel + Gui_OPTIONMENU_HEIGHT,
					theFinishBuffer.string, GuiLabel_RIGHT);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), label, 0, 1, row, row + 1);
				#endif

				#if motif
					bar = XmCreateMenuBar (form, "UiOptionMenu", NULL, 0);
					XtVaSetValues (bar, XmNx, fieldX - 4, XmNy, y - 4
						#if defined (macintosh)
							- 1
						#endif
						, XmNwidth, fieldWidth + 8, XmNheight, Gui_OPTIONMENU_HEIGHT + 8, NULL);
				#endif
				// TODO: dit wil natuurlijk heel graag in GuiComboBox.c ;)
				#if gtk
					field -> cascadeButton = gtk_combo_box_new_text ();
					gtk_combo_box_set_focus_on_click (GTK_COMBO_BOX (field -> cascadeButton), false);
					GTK_WIDGET_UNSET_FLAGS (field -> cascadeButton, GTK_CAN_DEFAULT);
					gtk_table_attach_defaults (GTK_TABLE (form), field -> cascadeButton, 1, 3, row, row + 1);
					row += 1;
				#elif motif
					box = GuiMenuBar_addMenu2 (bar, L"choice", 0, & field -> cascadeButton);
					XtVaSetValues (bar, XmNwidth, fieldWidth + 8, NULL);
					XtVaSetValues (field -> cascadeButton, XmNx, 4, XmNy, 4, XmNwidth, fieldWidth, XmNheight, Gui_OPTIONMENU_HEIGHT, NULL);
				#endif
				for (long ibutton = 1; ibutton <= field -> options -> size; ibutton ++) {
					UiOption button = static_cast <UiOption> (field -> options -> item [ibutton]);
					MelderString_copy (& theFinishBuffer, button -> name);
					#if gtk
						gtk_combo_box_append_text (GTK_COMBO_BOX (field -> cascadeButton), Melder_peekWcsToUtf8 (theFinishBuffer.string));
					#elif motif
						button -> toggle = XtVaCreateManagedWidget (Melder_peekWcsToUtf8 (theFinishBuffer.string), xmToggleButtonWidgetClass, box, NULL);
						XtAddCallback (button -> toggle, XmNvalueChangedCallback, cb_optionChanged, (XtPointer) field);
					#endif
				}
				#if gtk
					GuiObject_show (field -> cascadeButton);
				#elif motif
					GuiObject_show (bar);
				#endif
			} break;
			case UI_BOOLEAN:
			{
				MelderString_copy (& theFinishBuffer, field -> formLabel);
				/*GuiLabel_createShown (form, x, x + labelWidth, y, y + Gui_CHECKBUTTON_HEIGHT,
					theFinishBuffer.string, GuiLabel_RIGHT); */
				field -> toggle = GuiCheckButton_createShown (form,
					fieldX, dialogWidth /* allow to extend into the margin */, y, Gui_AUTOMATIC,
					theFinishBuffer.string, NULL, NULL, 0);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), field -> toggle, 1, 3, row, row + 1);
					row += 1;
				#endif
			} break;
			case UI_LIST:
			{
				int listWidth = my numberOfFields == 1 ? dialogWidth - fieldX : fieldWidth;
				MelderString_copy (& theFinishBuffer, field -> formLabel);
				appendColon ();
				GuiObject label = GuiLabel_createShown (form, x, x + labelWidth, y + 1, y + 21,
					theFinishBuffer.string, GuiLabel_RIGHT);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), label, 0, 1, row, row + 1);
				#endif
				field -> list = GuiList_create (form, fieldX, fieldX + listWidth, y, y + LIST_HEIGHT, false, theFinishBuffer.string);
				for (long i = 1; i <= field -> numberOfStrings; i ++) {
					GuiList_insertItem (field -> list, field -> strings [i], 0);
				}
				GuiObject_show (field -> list);
				#if gtk
					gtk_table_attach_defaults (GTK_TABLE (form), gtk_widget_get_parent (field -> list), 1, 3, row, row + 1);
					row += 1;
				#endif
			} break;
		}
	}
	for (long ifield = 1; ifield <= my numberOfFields; ifield ++)
		UiField_setDefault (my field [ifield]);
	/*separator = XmCreateSeparatorGadget (column, "separator", NULL, 0);*/
	y = dialogHeight - Gui_BOTTOM_DIALOG_SPACING - Gui_PUSHBUTTON_HEIGHT;
	if (my helpTitle) {
		my helpButton = GuiButton_createShown (buttons, HELP_BUTTON_X, HELP_BUTTON_X + HELP_BUTTON_WIDTH, y, Gui_AUTOMATIC,
			L"Help", gui_button_cb_help, me, 0);
		#if gtk
			gtk_button_box_set_child_secondary(GTK_BUTTON_BOX(buttons), my helpButton, TRUE);
		#endif
	}
	if (my numberOfFields > 1 || (my numberOfFields > 0 && my field [1] -> type != UI_LABEL)) {
		if (my isPauseForm) {
			my revertButton = GuiButton_createShown (buttons,
				HELP_BUTTON_X, HELP_BUTTON_X + REVERT_BUTTON_WIDTH,
				y, Gui_AUTOMATIC, L"Revert", gui_button_cb_revert, me, 0);
		} else {
			my revertButton = GuiButton_createShown (buttons,
				HELP_BUTTON_X + HELP_BUTTON_WIDTH + Gui_HORIZONTAL_DIALOG_SPACING,
				HELP_BUTTON_X + HELP_BUTTON_WIDTH + Gui_HORIZONTAL_DIALOG_SPACING + STANDARDS_BUTTON_WIDTH,
				y, Gui_AUTOMATIC, L"Standards", gui_button_cb_revert, me, 0);
		}
		#if gtk
			gtk_button_box_set_child_secondary (GTK_BUTTON_BOX (buttons), my revertButton, TRUE);
		#endif
	}
	if (my isPauseForm) {
		x = HELP_BUTTON_X + REVERT_BUTTON_WIDTH + Gui_HORIZONTAL_DIALOG_SPACING;
		if (my cancelContinueButton == 0) {
			my cancelButton = GuiButton_createShown (buttons, x, x + STOP_BUTTON_WIDTH, y, Gui_AUTOMATIC,
				L"Stop", gui_button_cb_cancel, me, GuiButton_CANCEL);
			x += STOP_BUTTON_WIDTH + 7;
		} else {
			x += 30;
		}
		int room = dialogWidth - Gui_RIGHT_DIALOG_SPACING - x;
		int roomPerContinueButton = room / my numberOfContinueButtons;
		int horizontalSpacing = my numberOfContinueButtons > 7 ? Gui_HORIZONTAL_DIALOG_SPACING - 2 * (my numberOfContinueButtons - 7) : Gui_HORIZONTAL_DIALOG_SPACING;
		int continueButtonWidth = roomPerContinueButton - horizontalSpacing;
		for (int i = 1; i <= my numberOfContinueButtons; i ++) {
			x = dialogWidth - Gui_RIGHT_DIALOG_SPACING - roomPerContinueButton * (my numberOfContinueButtons - i + 1) + horizontalSpacing;
			my continueButtons [i] = GuiButton_createShown (buttons, x, x + continueButtonWidth, y, Gui_AUTOMATIC,
				my continueTexts [i], gui_button_cb_ok, me, i == my defaultContinueButton ? GuiButton_DEFAULT : 0);
		}
	} else {
		x = dialogWidth - Gui_RIGHT_DIALOG_SPACING - Gui_OK_BUTTON_WIDTH - 2 * Gui_HORIZONTAL_DIALOG_SPACING
			 - Gui_APPLY_BUTTON_WIDTH - Gui_CANCEL_BUTTON_WIDTH;
		my cancelButton = GuiButton_createShown (buttons, x, x + Gui_CANCEL_BUTTON_WIDTH, y, Gui_AUTOMATIC,
			L"Cancel", gui_button_cb_cancel, me, GuiButton_CANCEL);
		x = dialogWidth - Gui_RIGHT_DIALOG_SPACING - Gui_OK_BUTTON_WIDTH - Gui_HORIZONTAL_DIALOG_SPACING - Gui_APPLY_BUTTON_WIDTH;
		if (my numberOfFields > 1 || my field [1] -> type != UI_LABEL) {
			my applyButton = GuiButton_createShown (buttons, x, x + Gui_APPLY_BUTTON_WIDTH, y, Gui_AUTOMATIC,
				L"Apply", gui_button_cb_apply, me, 0);
		}
		x = dialogWidth - Gui_RIGHT_DIALOG_SPACING - Gui_OK_BUTTON_WIDTH;
		my okButton = GuiButton_createShown (buttons, x, x + Gui_OK_BUTTON_WIDTH, y, Gui_AUTOMATIC,
			my isPauseForm ? L"Continue" : L"OK", gui_button_cb_ok, me, GuiButton_DEFAULT);
	}
	/*GuiObject_show (separator);*/
}

void UiForm_destroyWhenUnmanaged (I) {
	iam (UiForm);
	my destroyWhenUnmanaged = true;
}

void UiForm_do (I, bool modified) {
	iam (UiForm);
	my allowExecutionHook = theAllowExecutionHookHint;
	my allowExecutionClosure = theAllowExecutionClosureHint;
	/* Prevent double callbacks: */
	/*XtRemoveCallback (my okButton, XmNactivateCallback, UiForm_ok, (XtPointer) me);*/
	/* This is the only place where this callback is installed. Moved from UiForm_close ppgb950613. */
	/*XtAddCallback (my okButton, XmNactivateCallback, UiForm_ok, (XtPointer) me);*/
	GuiObject_show (my dialog);
	if (modified)
		UiForm_okOrApply (me, NULL, true);
}

int UiForm_parseString (I, const wchar_t *arguments, Interpreter interpreter) {
	iam (UiForm);
	int size = my numberOfFields;
	while (size >= 1 && my field [size] -> type == UI_LABEL)
		size --;   /* Ignore trailing fields without a value. */
	for (int i = 1; i < size; i ++) {
		static wchar_t stringValue [3000];
		int ichar = 0;
		if (my field [i] -> type == UI_LABEL)
			continue;   /* Ignore non-trailing fields without a value. */
		/*
		 * Skip spaces until next argument.
		 */
		while (*arguments == ' ' || *arguments == '\t') arguments ++;
		/*
		 * The argument is everything up to the next space, or, if that starts with a double quote,
		 * everything between this quote and the matching double quote;
		 * in this case, the argument can represent a double quote by a sequence of two double quotes.
		 * Example: the string
		 *     "I said ""hello"""
		 * will be passed to the dialog as a single argument containing the text
		 *     I said "hello"
		 */
		if (*arguments == '\"') {
			arguments ++;   /* Do not include leading double quote. */
			for (;;) {
				if (*arguments == '\0') return Melder_error1 (L"Missing matching quote.");
				if (*arguments == '\"' && * ++ arguments != '\"') break;   /* Remember second quote. */
				stringValue [ichar ++] = *arguments ++;
			}
		} else {
			while (*arguments != ' ' && *arguments != '\t' && *arguments != '\0')
				stringValue [ichar ++] = *arguments ++;
		}
		stringValue [ichar] = '\0';   /* Trailing null byte. */
		if (! UiField_stringToValue (my field [i], stringValue, interpreter))
			return Melder_error3 (L"Don't understand contents of field \"", my field [i] -> name, L"\".");
	}
	/* The last item is handled separately, because it consists of the rest of the line.
	 * Leading spaces are skipped, but trailing spaces are included.
	 */
	if (size > 0) {
		while (*arguments == ' ' || *arguments == '\t') arguments ++;
		if (! UiField_stringToValue (my field [size], arguments, interpreter))
			return Melder_error3 (L"Don't understand contents of field \"", my field [size] -> name, L"\".");
	}
	return my okCallback (me, NULL, interpreter, NULL, false, my buttonClosure);
}

int UiForm_parseStringE (EditorCommand cmd, const wchar_t *arguments, Interpreter interpreter) {
	return UiForm_parseString (cmd -> dialog, arguments, interpreter);
}

static UiField findField (UiForm me, const wchar_t *fieldName) {
	for (int ifield = 1; ifield <= my numberOfFields; ifield ++)
		if (wcsequ (fieldName, my field [ifield] -> name)) return my field [ifield];
	return NULL;
}

static void fatalField (UiForm dia) {
	Melder_fatal ("Wrong field in dialog \"%s\".", Melder_peekWcsToUtf8 (dia -> name));
}

void UiForm_setReal (I, const wchar_t *fieldName, double value) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_setReal:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	switch (field -> type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
			if (value == Melder_atof (field -> stringDefaultValue)) {
				GuiText_setString (field -> text, field -> stringDefaultValue);
			} else {
				wchar_t s [40];
				wcscpy (s, Melder_double (value));
				/*
				 * If the default is overtly real, the shown value must be as well.
				 */
				if ((wcschr (field -> stringDefaultValue, '.') || wcschr (field -> stringDefaultValue, 'e')) &&
					! (wcschr (s, '.') || wcschr (s, 'e')))
				{
					wcscat (s, L".0");
				}
				GuiText_setString (field -> text, s);
			}
		} break; case UI_COLOUR: {
			GuiText_setString (field -> text, Melder_double (value));   // some grey value
		} break; default: {
			Melder_fatal ("Wrong field in dialog \"%s\".", Melder_peekWcsToUtf8 (my name));
		}
	}
}

void UiForm_setInteger (I, const wchar_t *fieldName, long value) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_setInteger:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	switch (field -> type) {
		case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: {
			if (value == wcstol (field -> stringDefaultValue, NULL, 10)) {
				GuiText_setString (field -> text, field -> stringDefaultValue);
			} else {
				GuiText_setString (field -> text, Melder_integer (value));
			}
		} break; case UI_BOOLEAN: {
			GuiCheckButton_setValue (field -> toggle, value);
		} break; case UI_RADIO: {
			if (value < 1 || value > field -> options -> size) value = 1;   /* Guard against incorrect prefs file. */
			for (int i = 1; i <= field -> options -> size; i ++) {
				UiOption b = static_cast <UiOption> (field -> options -> item [i]);
				GuiRadioButton_setValue (b -> toggle, i == value);
			}
		} break; case UI_OPTIONMENU: {
			if (value < 1 || value > field -> options -> size) value = 1;   /* Guard against incorrect prefs file. */
			for (int i = 1; i <= field -> options -> size; i ++) {
				UiOption b = static_cast <UiOption> (field -> options -> item [i]);
				#if motif
				XmToggleButtonSetState (b -> toggle, i == value, False);
				if (i == value) {
					XtVaSetValues (field -> cascadeButton, motif_argXmString (XmNlabelString, Melder_peekWcsToUtf8 (b -> name)), NULL);
				}
				#endif
			}
		} break; case UI_LIST: {
			if (value < 1 || value > field -> numberOfStrings) value = 1;   /* Guard against incorrect prefs file. */
			GuiList_selectItem (field -> list, value);
		} break; default: {
			fatalField (me);
		}
	}
}

void UiForm_setString (I, const wchar_t *fieldName, const wchar_t *value) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_setString:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	if (value == NULL) value = L"";   /* Accept NULL strings. */
	switch (field -> type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: case UI_INTEGER: case UI_NATURAL:
			case UI_WORD: case UI_SENTENCE: case UI_COLOUR: case UI_CHANNEL: case UI_TEXT:
		{
			GuiText_setString (field -> text, value);
		} break; case UI_LABEL: {
			GuiLabel_setString (field -> text, value);
		} break; case UI_RADIO: {
			bool found = false;
			for (int i = 1; i <= field -> options -> size; i ++) {
				UiOption b = static_cast <UiOption> (field -> options -> item [i]);
				if (wcsequ (value, b -> name)) {
					GuiRadioButton_setValue (b -> toggle, true);
					found = true;
				} else {
					GuiRadioButton_setValue (b -> toggle, false);
				}
			}
			/* If not found: do nothing (guard against incorrect prefs file). */
		} break; case UI_OPTIONMENU: {
			bool found = false;
			for (int i = 1; i <= field -> options -> size; i ++) {
				UiOption b = static_cast <UiOption> (field -> options -> item [i]);
				if (wcsequ (value, b -> name)) {
					#if motif
					XmToggleButtonSetState (b -> toggle, True, False);
					#endif
					found = true;
					if (field -> type == UI_OPTIONMENU) {
						#if motif
						XtVaSetValues (field -> cascadeButton, motif_argXmString (XmNlabelString, Melder_peekWcsToUtf8 (value)), NULL);
						#endif
					}
				} else {
					#if motif
						XmToggleButtonSetState (b -> toggle, False, False);
					#endif
				}
			}
			/* If not found: do nothing (guard against incorrect prefs file). */
		} break; case UI_LIST: {
			long i;
			for (i = 1; i <= field -> numberOfStrings; i ++)
				if (wcsequ (value, field -> strings [i])) break;
			if (i > field -> numberOfStrings) i = 1;   /* Guard against incorrect prefs file. */
			GuiList_selectItem (field -> list, i);
		} break; default: {
			fatalField (me);
		}
	}
}

static UiField findField_check (UiForm me, const wchar_t *fieldName) {
	UiField result = findField (me, fieldName);
	if (result == NULL) {
		Melder_error3 (L"Cannot find field \"", fieldName, L"\" in form.\n"
			"The script may have changed while the form was open.\n"
			"Please click Cancel in the form and try again.");
	}
	return result;
}

double UiForm_getReal (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_getReal:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	switch (field -> type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
			return field -> realValue;
		} break; default: {
			fatalField (me);
		}
	}
	return 0.0;
}

double UiForm_getReal_check (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField_check (me, fieldName); cherror
	switch (field -> type) {
		case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
			return field -> realValue;
		} break; default: {
			Melder_error3 (L"Cannot find a real value in field \"", fieldName, L"\" in the form.\n"
				"The script may have changed while the form was open.\n"
				"Please click Cancel in the form and try again.");
		}
	}
end:
	return 0.0;
}

long UiForm_getInteger (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_getInteger:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	switch (field -> type) {
		case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: case UI_BOOLEAN: case UI_RADIO:
			case UI_OPTIONMENU: case UI_LIST:
		{
			return field -> integerValue;
		} break; default: {
			fatalField (me);
		}
	}
	return 0L;
}

long UiForm_getInteger_check (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField_check (me, fieldName); cherror
	switch (field -> type) {
		case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: case UI_BOOLEAN: case UI_RADIO:
			case UI_OPTIONMENU: case UI_LIST:
		{
			return field -> integerValue;
		} break; default: {
			Melder_error3 (L"Cannot find an integer value in field \"", fieldName, L"\" in the form.\n"
				"The script may have changed while the form was open.\n"
				"Please click Cancel in the form and try again.");
		}
	}
end:
	return 0L;
}

wchar_t * UiForm_getString (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_getString:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	switch (field -> type) {
		case UI_WORD: case UI_SENTENCE: case UI_TEXT: {
			return field -> stringValue;
		} break; case UI_RADIO: case UI_OPTIONMENU: {
			UiOption b = static_cast <UiOption> (field -> options -> item [field -> integerValue]);
			return b -> name;
		} break; case UI_LIST: {
			return (wchar_t *) field -> strings [field -> integerValue];
		} break; default: {
			fatalField (me);
		}
	}
	return NULL;
}

wchar_t * UiForm_getString_check (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField_check (me, fieldName); cherror
	switch (field -> type) {
		case UI_WORD: case UI_SENTENCE: case UI_TEXT: {
			return field -> stringValue;
		} break; case UI_RADIO: case UI_OPTIONMENU: {
			UiOption b = static_cast <UiOption> (field -> options -> item [field -> integerValue]);
			return b -> name;
		} break; case UI_LIST: {
			return (wchar_t *) field -> strings [field -> integerValue];
		} break; default: {
			Melder_error3 (L"Cannot find a string in field \"", fieldName, L"\" in the form.\n"
				"The script may have changed while the form was open.\n"
				"Please click Cancel in the form and try again.");
		}
	}
end:
	return NULL;
}

Graphics_Colour UiForm_getColour (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField (me, fieldName);
	if (field == NULL) Melder_fatal ("(UiForm_getColour:) No field \"%s\" in dialog \"%s\".",
		Melder_peekWcsToUtf8 (fieldName), Melder_peekWcsToUtf8 (my name));
	switch (field -> type) {
		case UI_COLOUR: {
			return field -> colourValue;
		} break; default: {
			fatalField (me);
		}
	}
	return Graphics_BLACK;
}

Graphics_Colour UiForm_getColour_check (I, const wchar_t *fieldName) {
	iam (UiForm);
	UiField field = findField_check (me, fieldName); cherror
	switch (field -> type) {
		case UI_COLOUR: {
			return field -> colourValue;
		} break; default: {
			Melder_error3 (L"Cannot find a real value in field \"", fieldName, L"\" in the form.\n"
				"The script may have changed while the form was open.\n"
				"Please click Cancel in the form and try again.");
		}
	}
end:
	return Graphics_BLACK;
}

int UiForm_Interpreter_addVariables (I, Interpreter interpreter) {
	iam (UiForm);
	static MelderString lowerCaseFieldName = { 0 };
	for (int ifield = 1; ifield <= my numberOfFields; ifield ++) {
		UiField field = my field [ifield];
		MelderString_copy (& lowerCaseFieldName, field -> name);
		/*
		 * Change e.g. "Number of people" to "number_of_people".
		 */
		lowerCaseFieldName.string [0] = towlower (lowerCaseFieldName.string [0]);
		for (wchar_t *p = & lowerCaseFieldName.string [0]; *p != '\0'; p ++) {
			if (*p == ' ') *p = '_';
		}
		switch (field -> type) {
			case UI_INTEGER: case UI_NATURAL: case UI_CHANNEL: case UI_BOOLEAN: {
				InterpreterVariable var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				var -> numericValue = field -> integerValue;
			} break; case UI_REAL: case UI_REAL_OR_UNDEFINED: case UI_POSITIVE: {
				InterpreterVariable var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				var -> numericValue = field -> realValue;
			} break; case UI_RADIO: case UI_OPTIONMENU: {
				InterpreterVariable var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				var -> numericValue = field -> integerValue;
				MelderString_appendCharacter (& lowerCaseFieldName, '$');
				var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				Melder_free (var -> stringValue);
				UiOption b = static_cast <UiOption> (field -> options -> item [field -> integerValue]);
				var -> stringValue = Melder_wcsdup_f (b -> name);
			} break; case UI_LIST: {
				InterpreterVariable var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				var -> numericValue = field -> integerValue;
				MelderString_appendCharacter (& lowerCaseFieldName, '$');
				var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				Melder_free (var -> stringValue);
				var -> stringValue = Melder_wcsdup_f ((wchar_t *) field -> strings [field -> integerValue]);
			} break; case UI_WORD: case UI_SENTENCE: case UI_TEXT: {
				MelderString_appendCharacter (& lowerCaseFieldName, '$');
				InterpreterVariable var = Interpreter_lookUpVariable (interpreter, lowerCaseFieldName.string); cherror
				Melder_free (var -> stringValue);
				var -> stringValue = Melder_wcsdup_f (field -> stringValue);
			} break; case UI_COLOUR: {
				// to be implemented
			} break; default: {
			}
		}
	}
end:
	iferror return 0;
	return 1;
}

int UiForm_getClickedContinueButton (UiForm me) {
	return my clickedContinueButton;
}

/* End of file Ui.cpp */
