listbox.c

/* This goofed-up box whacked into shape by Elliot Lee <sopwith@cuc.edu>
   (from the original listbox by Erik Troan <ewt@redhat.com>)
   and contributed to newt for use under the LGPL license.
   Copyright (C) 1996, 1997 Elliot Lee */

#include <slang.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "newt.h"
#include "newt_pr.h"


/* Linked list of items in the listbox */
struct items {
    char * text;
    const void *data;
    unsigned char isSelected;
    struct items *next;
};

/* Holds all the relevant information for this listbox */
struct listbox {
    newtComponent sb;   /* Scrollbar on right side of listbox */
    int curWidth;	/* size of text w/o scrollbar or border*/
    int curHeight;	/* size of text w/o border */
    int sbAdjust;
    int bdxAdjust, bdyAdjust;
    int numItems, numSelected;
    int userHasSetWidth;
    int currItem, startShowItem; /* startShowItem is the first item displayed
				   on the screen */
    int isActive; /* If we handle key events all the time, it seems
		     to do things even when they are supposed to be for
		     another button/whatever */
    struct items *boxItems;
    int grow;
    int flags; /* flags for this listbox, right now just
		  NEWT_FLAG_RETURNEXIT */
};

static void listboxDraw(newtComponent co);
static void listboxDestroy(newtComponent co);
static struct eventResult listboxEvent(newtComponent co, struct event ev);
static void newtListboxRealSetCurrent(newtComponent co);
static void listboxPlace(newtComponent co, int newLeft, int newTop);
static inline void updateWidth(newtComponent co, struct listbox * li,
				int maxField);
static void listboxMapped(newtComponent co, int isMapped);

static struct componentOps listboxOps = {
    listboxDraw,
    listboxEvent,
    listboxDestroy,
    listboxPlace,
    listboxMapped,
};

static void listboxMapped(newtComponent co, int isMapped) {
    struct listbox * li = co->data;

    co->isMapped = isMapped;
    if (li->sb)
	li->sb->ops->mapped(li->sb, isMapped);
}

static void listboxPlace(newtComponent co, int newLeft, int newTop) {
    struct listbox * li = co->data;

    co->top = newTop;
    co->left = newLeft;

    if (li->sb)
	li->sb->ops->place(li->sb, co->left + co->width - li->bdxAdjust - 1,
			   co->top + li->bdyAdjust);
}

newtComponent newtListbox(int left, int top, int height, int flags) {
    newtComponent co, sb;
    struct listbox * li;

    if (!(co = malloc(sizeof(*co))))
	return NULL;

    if (!(li = malloc(sizeof(struct listbox)))) {
	free(co);
	return NULL;
    }

    li->boxItems = NULL;
    li->numItems = 0;
    li->currItem = 0;
    li->numSelected = 0;
    li->isActive = 0;
    li->userHasSetWidth = 0;
    li->startShowItem = 0;
    li->sbAdjust = 0;
    li->bdxAdjust = 0;
    li->bdyAdjust = 0;
    li->flags = flags & (NEWT_FLAG_RETURNEXIT | NEWT_FLAG_BORDER |
			 NEWT_FLAG_MULTIPLE | NEWT_FLAG_SHOWCURSOR);

    if (li->flags & NEWT_FLAG_BORDER) {
	li->bdxAdjust = 2;
	li->bdyAdjust = 1;
    }

    co->height = height;
    li->curHeight = co->height - (2 * li->bdyAdjust);

    if (height) {
	li->grow = 0;
	if (flags & NEWT_FLAG_SCROLL) {
	    sb = newtVerticalScrollbar(left, top + li->bdyAdjust,
					li->curHeight,
					COLORSET_LISTBOX, COLORSET_ACTLISTBOX);
	    li->sbAdjust = 3;
	} else {
	    sb = NULL;
	}
    } else {
	li->grow = 1;
	sb = NULL;
    }

    li->sb = sb;
    co->data = li;
    co->isMapped = 0;
    co->left = left;
    co->top = top;
    co->ops = &listboxOps;
    co->takesFocus = 1;
    co->callback = NULL;
    co->destroyCallback = NULL;

    updateWidth(co, li, 5);

    return co;
}

static inline void updateWidth(newtComponent co, struct listbox * li,
				int maxField) {
    li->curWidth = maxField;
    co->width = li->curWidth + li->sbAdjust + 2 * li->bdxAdjust;

    if (li->sb)
	li->sb->left = co->left + co->width - li->bdxAdjust - 1;
}

void newtListboxSetCurrentByKey(newtComponent co, void * key) {
    struct listbox * li = co->data;
    struct items * item;
    int i;

    item = li->boxItems, i = 0;
    while (item && item->data != key)
	item = item->next, i++;

    if (item)
	newtListboxSetCurrent(co, i);
}

void newtListboxSetCurrent(newtComponent co, int num)
{
    struct listbox * li = co->data;

    if (num >= li->numItems)
	li->currItem = li->numItems - 1;
    else if (num < 0)
	li->currItem = 0;
    else
	li->currItem = num;

    if (li->currItem < li->startShowItem)
	li->startShowItem = li->currItem;
    else if (li->currItem - li->startShowItem > li->curHeight - 1)
	li->startShowItem = li->currItem - li->curHeight + 1;
    if (li->startShowItem + li->curHeight > li->numItems)
	li->startShowItem = li->numItems - li->curHeight;
    if(li->startShowItem < 0)
	li->startShowItem = 0;

    newtListboxRealSetCurrent(co);
}

static void newtListboxRealSetCurrent(newtComponent co)
{
    struct listbox * li = co->data;

    if(li->sb)
	newtScrollbarSet(li->sb, li->currItem + 1, li->numItems);
    listboxDraw(co);
    if(co->callback) co->callback(co, co->callbackData);
}

void newtListboxSetWidth(newtComponent co, int width) {
    struct listbox * li = co->data;

    co->width = width;
    li->curWidth = co->width - li->sbAdjust - 2 * li->bdxAdjust;
    li->userHasSetWidth = 1;
    if (li->sb)
	li->sb->left = co->left + co->width - li->bdxAdjust - 1;
    listboxDraw(co);
}

void * newtListboxGetCurrent(newtComponent co) {
    struct listbox * li = co->data;
    int i;
    struct items *item;

    for(i = 0, item = li->boxItems; item != NULL && i < li->currItem;
	i++, item = item->next);

    if (item)
	return (void *)item->data;
    else
	return NULL;
}

void newtListboxSelectItem(newtComponent co, const void * key,
	enum newtFlagsSense sense)
{
    struct listbox * li = co->data;
    int i;
    struct items * item;

    item = li->boxItems, i = 0;
    while (item && item->data != key)
	item = item->next, i++;

    if (!item) return;

    if (item->isSelected)
	li->numSelected--;

    switch(sense) {
	case NEWT_FLAGS_RESET:
		item->isSelected = 0; break;
	case NEWT_FLAGS_SET:
		item->isSelected = 1; break;
	case NEWT_FLAGS_TOGGLE:
		item->isSelected = !item->isSelected;
    }

    if (item->isSelected)
	li->numSelected++;

    listboxDraw(co);
}

void newtListboxClearSelection(newtComponent co)
{
    struct items *item;
    struct listbox * li = co->data;

    for(item = li->boxItems; item != NULL;
	item = item->next)
	item->isSelected = 0;
    li->numSelected = 0;
    listboxDraw(co);
}

/* Free the returned array after use, but NOT the values in the array */
void ** newtListboxGetSelection(newtComponent co, int *numitems)
{
    struct listbox * li;
    int i;
    void **retval;
    struct items *item;

    if(!co || !numitems) return NULL;

    li = co->data;
    if(!li || !li->numSelected) return NULL;

    retval = malloc(li->numSelected * sizeof(void *));
    for(i = 0, item = li->boxItems; item != NULL;
	item = item->next)
	if(item->isSelected)
	    retval[i++] = (void *)item->data;
    *numitems = li->numSelected;
    return retval;
}

void newtListboxSetEntry(newtComponent co, int num, const char * text) {
    struct listbox * li = co->data;
    int i;
    struct items *item;

    for(i = 0, item = li->boxItems; item != NULL && i < num;
	i++, item = item->next);

    if(!item)
	return;
    else {
	free(item->text);
	item->text = strdup(text);
    }
    if (li->userHasSetWidth == 0 && wstrlen(text,-1) > li->curWidth) {
	updateWidth(co, li, wstrlen(text,-1));
    }

    if (num >= li->startShowItem && num <= li->startShowItem + co->height)
	listboxDraw(co);
}

void newtListboxSetData(newtComponent co, int num, void * data) {
    struct listbox * li = co->data;
    int i;
    struct items *item;

    for(i = 0, item = li->boxItems; item != NULL && i < num;
	i++, item = item->next);

    if (item)
	item->data = data;
}

int newtListboxAppendEntry(newtComponent co, const char * text,
	                const void * data) {
    struct listbox * li = co->data;
    struct items *item;

    if(li->boxItems) {
	for (item = li->boxItems; item->next != NULL; item = item->next);

	item = item->next = malloc(sizeof(struct items));
    } else {
	item = li->boxItems = malloc(sizeof(struct items));
    }

    if (!li->userHasSetWidth && text && (wstrlen(text,-1) > li->curWidth))
	updateWidth(co, li, wstrlen(text,-1));

    item->text = strdup(text); item->data = data; item->next = NULL;
    item->isSelected = 0;

    if (li->grow)
	co->height++, li->curHeight++;
    li->numItems++;

    return 0;
}

int newtListboxInsertEntry(newtComponent co, const char * text,
	                   const void * data, void * key) {
    struct listbox * li = co->data;
    struct items *item, *t;

    if (li->boxItems) {
	if (key) {
	    item = li->boxItems;
	    while (item && item->data != key) item = item->next;

	    if (!item) return 1;

	    t = item->next;
	    item = item->next = malloc(sizeof(struct items));
	    item->next = t;
	} else {
	    t = li->boxItems;
	    item = li->boxItems = malloc(sizeof(struct items));
	    item->next = t;
	}
    } else if (key) {
	return 1;
    } else {
	item = li->boxItems = malloc(sizeof(struct items));
	item->next = NULL;
    }

    if (!li->userHasSetWidth && text && (wstrlen(text,-1) > li->curWidth))
	updateWidth(co, li, wstrlen(text,-1));

    item->text = strdup(text?text:"(null)"); item->data = data;
    item->isSelected = 0;

    if (li->sb)
	li->sb->left = co->left + co->width - li->bdxAdjust - 1;
    li->numItems++;

    listboxDraw(co);

    return 0;
}

int newtListboxDeleteEntry(newtComponent co, void * key) {
    struct listbox * li = co->data;
    int widest = 0, t;
    struct items *item, *item2 = NULL;
    int num;

    if (li->boxItems == NULL || li->numItems <= 0)
	return 0;

    num = 0;

    item2 = NULL, item = li->boxItems;
    while (item && item->data != key) {
	item2 = item;
	item = item->next;
	num++;
    }

    if (!item)
	return -1;

    if (item2)
	item2->next = item->next;
    else
	li->boxItems = item->next;

    free(item->text);
    free(item);
    li->numItems--;

    if (!li->userHasSetWidth) {
	widest = 0;
	for (item = li->boxItems; item != NULL; item = item->next)
	    if ((t = wstrlen(item->text,-1)) > widest) widest = t;
    }

    if (li->currItem >= num)
	li->currItem--;

    if (!li->userHasSetWidth) {
	updateWidth(co, li, widest);
    }

    listboxDraw(co);

    return 0;
}

void newtListboxClear(newtComponent co)
{
    struct listbox * li;
    struct items *anitem, *nextitem;
    if(co == NULL || (li = co->data) == NULL)
	return;
    for(anitem = li->boxItems; anitem != NULL; anitem = nextitem) {
	nextitem = anitem->next;
	free(anitem->text);
	free(anitem);
    }
    li->numItems = li->numSelected = li->currItem = li->startShowItem = 0;
    li->boxItems = NULL;
    if (!li->userHasSetWidth)
	updateWidth(co, li, 5);
}

int newtListboxItemCount(newtComponent co)
{
    struct listbox *li = co->data;
    return li->numItems;
}

/* If you don't want to get back the text, pass in NULL for the ptr-ptr. Same
   goes for the data. */
void newtListboxGetEntry(newtComponent co, int num, char **text, void **data) {
    struct listbox * li = co->data;
    int i;
    struct items *item;

    if (!li->boxItems || num >= li->numItems) {
	if(text)
	    *text = NULL;
	if(data)
	    *data = NULL;
	return;
    }

    i = 0;
    item = li->boxItems;
    while (item && i < num) {
	i++, item = item->next;
    }

    if (item) {
	if (text)
	    *text = item->text;
	if (data)
	    *data = (void *)item->data;
    }
}

static void listboxDraw(newtComponent co)
{
    struct listbox * li = co->data;
    struct items *item;
    int i, j;

    if (!co->isMapped) return ;

    newtTrashScreen();
    
    if(li->flags & NEWT_FLAG_BORDER) {
      if(li->isActive)
	  SLsmg_set_color(NEWT_COLORSET_ACTLISTBOX);
      else
          SLsmg_set_color(NEWT_COLORSET_LISTBOX);

      newtDrawBox(co->left, co->top, co->width, co->height, 0);
    }

    if(li->sb)
	li->sb->ops->draw(li->sb);

    SLsmg_set_color(NEWT_COLORSET_LISTBOX);

    for(i = 0, item = li->boxItems; item != NULL && i < li->startShowItem;
	i++, item = item->next);

    j = i;

    for (i = 0; item != NULL && i < li->curHeight; i++, item = item->next) {
	if (!item->text) continue;

	newtGotorc(co->top + i + li->bdyAdjust, co->left + li->bdxAdjust);
	if(j + i == li->currItem) {
	    if(li->isActive)
		SLsmg_set_color(NEWT_COLORSET_ACTSELLISTBOX);
	    else
		SLsmg_set_color(NEWT_COLORSET_ACTLISTBOX);
	} else if(item->isSelected)
	    SLsmg_set_color(NEWT_COLORSET_SELLISTBOX);
	else
	    SLsmg_set_color(NEWT_COLORSET_LISTBOX);

	SLsmg_write_nstring(item->text, li->curWidth);

	if (li->flags & NEWT_FLAG_MULTIPLE) {
	    newtGotorc(co->top + i + li->bdyAdjust, co->left + li->bdxAdjust);
	    SLsmg_set_color(item->isSelected ?
		    NEWT_COLORSET_SELLISTBOX : NEWT_COLORSET_LISTBOX);
	    SLsmg_write_nstring(item->text, 1);
	}
    }
    newtGotorc(co->top + (li->currItem - li->startShowItem) + li->bdyAdjust,
               co->left + li->bdxAdjust);
}

static struct eventResult listboxEvent(newtComponent co, struct event ev) {
    struct eventResult er;
    struct listbox * li = co->data;
    struct items *item;
    int i;
    
    er.result = ER_IGNORED;

    if(ev.when == EV_EARLY || ev.when == EV_LATE) {
	return er;
    }

    switch(ev.event) {
      case EV_KEYPRESS:
	if (!li->isActive) break;

	switch(ev.u.key) {
	  case ' ':
	    if(!(li->flags & NEWT_FLAG_MULTIPLE)) break;
	    newtListboxSelectItem(co, newtListboxGetCurrent(co),
				  NEWT_FLAGS_TOGGLE);
	    er.result = ER_SWALLOWED;
	    /* We don't break here, because it is cool to be able to
	       hold space to select a bunch of items in a list at once */

	  case NEWT_KEY_DOWN:
	    if(li->numItems <= 0) break;
	    if(li->currItem < li->numItems - 1) {
		li->currItem++;
		if(li->currItem > (li->startShowItem + li->curHeight - 1)) {
		    li->startShowItem = li->currItem - li->curHeight + 1;
		    if(li->startShowItem + li->curHeight > li->numItems)
			li->startShowItem = li->numItems - li->curHeight;
		}
		if(li->sb)
		    newtScrollbarSet(li->sb, li->currItem + 1, li->numItems);
		listboxDraw(co);
	    }
	    if(co->callback) co->callback(co, co->callbackData);
	    er.result = ER_SWALLOWED;
	    break;

	  case NEWT_KEY_ENTER:
	    if(li->numItems <= 0) break;
	    if(li->flags & NEWT_FLAG_RETURNEXIT)
		er.result = ER_EXITFORM;
	    break;

	  case NEWT_KEY_UP:
	    if(li->numItems <= 0) break;
	    if(li->currItem > 0) {
		li->currItem--;
		if(li->currItem < li->startShowItem)
		    li->startShowItem = li->currItem;
		if(li->sb)
		    newtScrollbarSet(li->sb, li->currItem + 1, li->numItems);
		listboxDraw(co);
	    }
	    if(co->callback) co->callback(co, co->callbackData);
	    er.result = ER_SWALLOWED;
	    break;

	  case NEWT_KEY_PGUP:
	    if(li->numItems <= 0) break;
	    li->startShowItem -= li->curHeight - 1;
	    if(li->startShowItem < 0)
		li->startShowItem = 0;
	    li->currItem -= li->curHeight - 1;
	    if(li->currItem < 0)
		li->currItem = 0;
	    newtListboxRealSetCurrent(co);
	    er.result = ER_SWALLOWED;
	    break;

	  case NEWT_KEY_PGDN:
	    if(li->numItems <= 0) break;
	    li->startShowItem += li->curHeight;
	    if(li->startShowItem > (li->numItems - li->curHeight)) {
		li->startShowItem = li->numItems - li->curHeight;
	    }
	    li->currItem += li->curHeight;
	    if(li->currItem >= li->numItems) {
		li->currItem = li->numItems - 1;
	    }
	    newtListboxRealSetCurrent(co);
	    er.result = ER_SWALLOWED;
	    break;

	  case NEWT_KEY_HOME:
	    if(li->numItems <= 0) break;
	    newtListboxSetCurrent(co, 0);
	    er.result = ER_SWALLOWED;
	    break;

	  case NEWT_KEY_END:
	    if(li->numItems <= 0) break;
	    li->startShowItem = li->numItems - li->curHeight;
	    if(li->startShowItem < 0)
		li->startShowItem = 0;
	    li->currItem = li->numItems - 1;
	    newtListboxRealSetCurrent(co);
	    er.result = ER_SWALLOWED;
	    break;
	  default:
	      if (li->numItems <= 0) break;
              if (ev.u.key < NEWT_KEY_EXTRA_BASE && isalpha(ev.u.key)) {
		  for(i = 0, item = li->boxItems; item != NULL &&
			  i < li->currItem; i++, item = item->next);

		  if (item && item->text && (toupper(*item->text) == toupper(ev.u.key))) {
		      item = item->next;
		      i++;
		  } else { 
		      item = li->boxItems;
		      i = 0;
		  }
		  while (item && item->text &&
			 toupper(*item->text) != toupper(ev.u.key)) {
		      item = item->next;
		      i++;
		  }
		  if (item) {
		      li->currItem = i;
		      if(li->currItem < li->startShowItem ||
			 li->currItem > li->startShowItem)
			  li->startShowItem =
			      li->currItem > li->numItems - li->curHeight ?
			      li->numItems - li->curHeight :
			      li->currItem;
		      if(li->sb)
			  newtScrollbarSet(li->sb, li->currItem + 1, li->numItems);
		      newtListboxRealSetCurrent(co);
		      er.result = ER_SWALLOWED;
		  }
	      }
	}
	break;

      case EV_FOCUS:
	li->isActive = 1;
	listboxDraw(co);
	if(li->flags & NEWT_FLAG_SHOWCURSOR)
	  newtCursorOn();
	er.result = ER_SWALLOWED;
	break;

      case EV_UNFOCUS:
	li->isActive = 0;
	listboxDraw(co);
	if(li->flags & NEWT_FLAG_SHOWCURSOR)
	  newtCursorOff();
	er.result = ER_SWALLOWED;
	break;

      case EV_MOUSE:
	  /* if this mouse click was within the listbox, make the current
	     item the item clicked on. */
	/* Up scroll arrow */
	if (li->sb &&
	    ev.u.mouse.x == co->left + co->width - li->bdxAdjust - 1 &&
	    ev.u.mouse.y == co->top + li->bdyAdjust) {
	    if(li->numItems <= 0) break;
	    if(li->currItem > 0) {
		li->currItem--;
		if(li->currItem < li->startShowItem)
		    li->startShowItem = li->currItem;
		if(li->sb)
		    newtScrollbarSet(li->sb, li->currItem + 1, li->numItems);
		listboxDraw(co);
	    }
	    if(co->callback) co->callback(co, co->callbackData);
	    er.result = ER_SWALLOWED;
	    break;
	}
	/* Down scroll arrow */
	if (li->sb &&
	    ev.u.mouse.x == co->left + co->width - li->bdxAdjust - 1 &&
	    ev.u.mouse.y == co->top + co->height - li->bdyAdjust - 1) {
	    if(li->numItems <= 0) break;
	    if(li->currItem < li->numItems - 1) {
		li->currItem++;
		if(li->currItem > (li->startShowItem + li->curHeight - 1)) {
		    li->startShowItem = li->currItem - li->curHeight + 1;
		    if(li->startShowItem + li->curHeight > li->numItems)
			li->startShowItem = li->numItems - li->curHeight;
		}
		if(li->sb)
		    newtScrollbarSet(li->sb, li->currItem + 1, li->numItems);
		listboxDraw(co);
	    }
	    if(co->callback) co->callback(co, co->callbackData);
	    er.result = ER_SWALLOWED;
	    break;
	}
	if ((ev.u.mouse.y >= co->top + li->bdyAdjust) &&
	    (ev.u.mouse.y <= co->top + co->height - (li->bdyAdjust * 2)) &&
	    (ev.u.mouse.x >= co->left + li->bdxAdjust) &&
	    (ev.u.mouse.x <= co->left + co->width + (li->bdxAdjust * 2))) {
	    li->currItem = li->startShowItem +
		(ev.u.mouse.y - li->bdyAdjust - co->top);
	    newtListboxRealSetCurrent(co);
	    listboxDraw(co);
	    if(co->callback) co->callback(co, co->callbackData);
	    er.result = ER_SWALLOWED;
	    break;
	}
    }

    return er;
}

static void listboxDestroy(newtComponent co) {
    struct listbox * li = co->data;
    struct items * item, * nextitem;

    item = li->boxItems;

    while (item != NULL) {
	nextitem = item->next;
	free(item->text);
	free(item);
	item = nextitem;
    }

    if (li->sb) li->sb->ops->destroy(li->sb);

    free(li);
    free(co);
}