ui/common/types.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

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

#include <cx/list.h>
#include <cx/array_list.h>
#include "../ui/list.h"
#include "types.h"
#include "context.h"
#include "../ui/image.h"

static ui_list_init_func default_list_init;
static void *default_list_init_userdata;
static ui_list_destroy_func default_list_destroy;
static void *default_list_destroy_userdata;

UiObserver* ui_observer_new(ui_callback f, void *data) {
    UiObserver *observer = malloc(sizeof(UiObserver));
    observer->callback = f;
    observer->data = data;
    observer->next = NULL;
    return observer;
}

UiObserver* ui_obsvlist_add(UiObserver *list, UiObserver *observer) {
    if(!list) {
        return observer;
    } else {
        UiObserver *l = list;
        while(l->next) {
            l = l->next;
        }
        l->next = observer;
        return list;
    }
}

UiObserver* ui_add_observer(UiObserver *list, ui_callback f, void *data) {
    UiObserver *observer = ui_observer_new(f, data);
    return ui_obsvlist_add(list, observer);
}

void ui_notify(UiObserver *observer, void *data) {
    ui_notify_except(observer, NULL, data);
}

void ui_notify_except(UiObserver *observer, UiObserver *exc, void *data) {
    UiEvent evt;
    evt.obj = NULL;
    evt.window = NULL;
    evt.document = NULL;
    evt.eventdata = data;
    evt.eventdatatype = UI_EVENT_DATA_POINTER;
    evt.intval = 0;
    
    while(observer) {
        if(observer != exc) { 
            observer->callback(&evt, observer->data);
        }
        observer = observer->next;
    }
}

void ui_notify_evt(UiObserver *observer, UiEvent *event) {
    while(observer) {
        observer->callback(event, observer->data);
        observer = observer->next;
    }
}

/* --------------------------- UiList --------------------------- */

void uic_ucx_list_init(UiContext *ctx, UiList *list, void *unused) {
    const CxAllocator *a = ctx ? ctx->allocator : cxDefaultAllocator;
    list->destroy = uic_ucx_list_destroy;
    list->data = cxArrayListCreate(a, CX_STORE_POINTERS, 32);
    list->first = ui_list_first;
    list->next = ui_list_next;
    list->get = ui_list_get;
    list->count = ui_list_count;
}

void uic_ucx_list_destroy(UiContext *ctx, UiList *list, void *unused) {
    cxListFree(list->data);
}

UiList* ui_list_new(UiContext *ctx, const char *name) {
    return ui_list_new2(ctx, name, default_list_init ? default_list_init : uic_ucx_list_init, default_list_init_userdata);
}

UiList* ui_list_new2(UiContext *ctx, const char *name, ui_list_init_func listinit, void *userdata) {
    UiList *list = ui_malloc(ctx, sizeof(UiList));
    memset(list, 0, sizeof(UiList));
    listinit(ctx, list, userdata);
    list->save_selection = TRUE;
    
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_LIST, list);
    }
    
    return list;
}

void ui_list_free(UiContext *ctx, UiList *list) {
    if(list->destroy) {
        list->destroy(ctx, list, NULL);
    } else if(!default_list_destroy) {
        uic_ucx_list_destroy(ctx, list, NULL);
    } else {
        default_list_destroy(ctx, list, default_list_destroy_userdata);
    }
    ui_list_selection_free(list->saved_selection);
    ui_free(ctx, list);
}

void* ui_list_first(UiList *list) {
    list->iter = (void*)(intptr_t)0;
    return cxListAt(list->data, 0);
}

void* ui_list_next(UiList *list) {
    intptr_t iter = (intptr_t)list->iter;
    iter++;
    void *elm = cxListAt(list->data, iter);
    if(elm) {
        list->iter = (void*)iter;
    }
    return elm;
}

void* ui_list_get(UiList *list, int i) {
    return i >= 0 ? cxListAt(list->data, i) : NULL;
}

int ui_list_count(UiList *list) {
    return cxListSize(list->data);
}

void ui_list_append(UiList *list, void *data) {
    cxListAdd(list->data, data);
}

void ui_list_prepend(UiList *list, void *data) {
    cxListInsert(list->data, 0, data);
}

void ui_list_insert(UiList *list, int index, void *data) {
    cxListInsert(list->data, (size_t)index, data);
}

void ui_list_remove(UiList *list, int i) {
    if(i >= 0) {
        cxListRemove(list->data, i);
    }
}

void ui_list_clear(UiList *list) {
    cxListClear(list->data);
}

void ui_list_update(UiList *list) {
    if(list->update) {
        list->update(list, -1);
    }
}

void ui_list_update_row(UiList *list, int row) {
    if(list->update) {
        list->update(list, row);
    }
}

UiListSelection ui_list_get_selection(UiList *list) {
    if(list->getselection) {
        return list->getselection(list);
    } else {
        return (UiListSelection){0, NULL};
    }
}

UIEXPORT void ui_list_set_selection(UiList *list, UiListSelection sel) {
    if(list->setselection) {
        list->setselection(list, sel);
    }
}

void ui_list_addobsv(UiList *list, ui_callback f, void *data) {
    list->observers = ui_add_observer(list->observers, f, data);
}

void ui_list_notify(UiList *list) {
    ui_notify(list->observers, list);
}

void ui_list_clear_saved_selection(UiList *list) {
    ui_list_selection_free(list->saved_selection);
    list->saved_selection = NULL;
}


typedef struct {
    int  type;
    char *name;
} UiColumn;

UiModel* ui_model(UiContext *ctx, ...) {
    UiModel *info = ui_calloc(ctx, 1, sizeof(UiModel));
    info->ctx = ctx;
    info->ref = 1;
    
    va_list ap;
    va_start(ap, ctx);
    
    CxList *cols = cxArrayListCreate(cxDefaultAllocator, sizeof(UiColumn), 32);
    int type;
    while((type = va_arg(ap, int)) != -1) {
        char *name = va_arg(ap, char*);
        
        UiColumn column;
        column.type = type;
        column.name = name;
        
        cxListAdd(cols, &column);
    }
    
    va_end(ap);
    
    size_t len = cxListSize(cols);
    info->alloc = len;
    info->columns = len;
    info->types = ui_calloc(ctx, len, sizeof(UiModelType));
    info->titles = ui_calloc(ctx, len, sizeof(char*));
    info->columnsize = ui_calloc(ctx, len, sizeof(int));
    
    int i = 0;
    CxIterator iter = cxListIterator(cols);
    cx_foreach(UiColumn*, c, iter) {
        info->types[i] = c->type;
        info->titles[i] = ui_strdup(ctx, c->name);
        i++;
    }
    cxListFree(cols);
    
    return info;
}

#define UI_MODEL_DEFAULT_ALLOC_SIZE 16


static void model_notify_observer(UiModel *model, int insert, int delete) {
    UiModelChangeObserver *obs = model->observer;
    while(obs) {
        obs->update(model, obs->userdata, insert, delete);
        obs = obs->next;
    }
}

UiModel* ui_model_new(UiContext *ctx) {
    UiModel *info = ui_calloc(ctx, 1, sizeof(UiModel));
    info->ctx = ctx;
    info->ref = 1;
    info->alloc = UI_MODEL_DEFAULT_ALLOC_SIZE;
    info->types = ui_calloc(ctx, UI_MODEL_DEFAULT_ALLOC_SIZE, sizeof(UiModelType));
    info->titles = ui_calloc(ctx, UI_MODEL_DEFAULT_ALLOC_SIZE, sizeof(char*));
    info->columnsize = ui_calloc(ctx, UI_MODEL_DEFAULT_ALLOC_SIZE, sizeof(int));
    return info;
}

void ui_model_add_column(UiModel *model, UiModelType type, const char *title, int width) {
    UiContext *ctx = model->ctx;
    if(model->columns >= model->alloc) {
        model->alloc += UI_MODEL_DEFAULT_ALLOC_SIZE;
        model->types = ui_realloc(ctx, model->types, model->alloc * sizeof(UiModelType));
        model->titles = ui_realloc(ctx, model->titles, model->alloc * sizeof(char*));
        model->columnsize = ui_realloc(ctx, model->columnsize, model->alloc * sizeof(int));
    }
    int index = model->columns;
    model->types[index] = type;
    model->titles[index] = ui_strdup(ctx, title);
    model->columnsize[index] = width;
    
    model_notify_observer(model, index, -1);
    
    model->columns++;
}

UiModel* ui_model_copy(UiContext *ctx, UiModel* model) {
    const CxAllocator* a = ctx ? ctx->allocator : cxDefaultAllocator;

    UiModel* newmodel = cxMalloc(a, sizeof(UiModel));
    newmodel->ctx = ctx;
    *newmodel = *model;

    newmodel->types = cxCalloc(a, model->columns, sizeof(UiModelType));
    memcpy(newmodel->types, model->types, model->columns);

    newmodel->titles = cxCalloc(a, model->columns, sizeof(char*));
    for (int i = 0; i < model->columns; i++) {
        newmodel->titles[i] = model->titles[i] ? cx_strdup_a(a, cx_str(model->titles[i])).ptr : NULL;
    }
    newmodel->columnsize = cxCalloc(a, model->columns, sizeof(int));
    memcpy(newmodel->columnsize, model->columnsize, model->columns*sizeof(int));

    return newmodel;
}

void ui_model_ref(UiModel *model) {
    model->ref++;
}

void ui_model_unref(UiModel *model) { 
    if(--model->ref == 0) {
        ui_model_free(model);
    }
}

void ui_model_add_observer(UiModel *model, ui_model_update_func update, void *data) {
    UiModelChangeObserver *observer = ui_malloc(model->ctx, sizeof(UiModelChangeObserver));
    observer->update = update;
    observer->userdata = data;
    observer->next = NULL;
    
    if(model->observer) {
        UiModelChangeObserver *last = model->observer;
        while(last->next) {
            last = last->next;
        }
        last->next = observer;
    } else {
        model->observer = observer;
    }
}

void ui_model_remove_observer(UiModel *model, void *data) {
    if(model->observer) {
        UiModelChangeObserver *obs = model->observer;
        UiModelChangeObserver *prev = NULL;
        while(obs) {
            if(obs->userdata == data) {
                // remove
                if(prev) {
                    prev->next = obs->next;
                } else {
                    model->observer = obs->next;
                }
                // free
                ui_free(model->ctx, obs);
                break;
            }
            prev = obs;
            obs = obs->next;
        }
    }
}

void ui_model_free(UiModel *mi) {
    UiContext *ctx = mi->ctx;
    const CxAllocator* a = ctx ? ctx->allocator : cxDefaultAllocator;
    for(int i=0;i<mi->columns;i++) {
        ui_free(ctx, mi->titles[i]);
    }
    UiModelChangeObserver *obs = mi->observer;
    while(obs) {
        UiModelChangeObserver *n = obs->next;
        cxFree(a, obs);
        obs = n;
    }
    cxFree(a, mi->types);
    cxFree(a, mi->titles);
    cxFree(a, mi->columnsize);
    cxFree(a, mi);
}

// types

// public functions
UiInteger* ui_int_new(UiContext *ctx, const char *name) {
    UiInteger *i = ui_malloc(ctx, sizeof(UiInteger));
    memset(i, 0, sizeof(UiInteger));
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_INTEGER, i);
    }
    return i;
}

UiDouble* ui_double_new(UiContext *ctx, const char *name) {
    UiDouble *d = ui_malloc(ctx, sizeof(UiDouble));
    memset(d, 0, sizeof(UiDouble));
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_DOUBLE, d);
    }
    return d;
}

static void string_destroy(UiString *s) {
    if(s->value.free && s->value.ptr) {
        s->value.free(s->value.ptr);
    }
}

UiString* ui_string_new(UiContext *ctx, const char *name) {
    UiString *s = ui_malloc(ctx, sizeof(UiString));
    memset(s, 0, sizeof(UiString));
    ui_set_destructor(s, (ui_destructor_func)string_destroy);
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_STRING, s);
    }
    return s;
}

static void text_destroy(UiText *t) {
    if(t->destroy) {
        t->destroy(t);
    }
}

UiText* ui_text_new(UiContext *ctx, const char *name) {
    UiText *t = ui_malloc(ctx, sizeof(UiText));
    memset(t, 0, sizeof(UiText));
    ui_set_destructor(t, (ui_destructor_func)text_destroy);
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_TEXT, t);
    }
    return t;
}

UiRange* ui_range_new(UiContext *ctx, const char *name) {
    UiRange *r = ui_malloc(ctx, sizeof(UiRange));
    memset(r, 0, sizeof(UiRange));
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_RANGE, r);
    }
    return r;
}

static void generic_destroy(UiGeneric *g) {
    if(g->destroy) {
        g->destroy(g);
    }
}

UiGeneric* ui_generic_new(UiContext *ctx, const char *name) {
    UiGeneric *g = ui_malloc(ctx, sizeof(UiGeneric));
    memset(g, 0, sizeof(UiGeneric));
    if(ctx) {
        ui_set_destructor(g, (ui_destructor_func)generic_destroy);
    }
    if(name && ctx) {
        uic_reg_var(ctx, name, UI_VAR_GENERIC, g);
    }
    return g;
}


void ui_int_set(UiInteger* i, int64_t value) {
    if (i) {
        if (i->set) {
            ui_setop_enable(TRUE);
            i->set(i, value);
            ui_setop_enable(FALSE);
        } else {
            i->value = value;
        }
    }
}

int64_t ui_int_get(UiInteger* i) {
    if (i) {
        return i->get ? i->get(i) : i->value;
    } else {
        return 0;
    }
}

void ui_double_set(UiDouble* d, double value) {
    if (d) {
        if (d->set) {
            ui_setop_enable(TRUE);
            d->set(d, value);
            ui_setop_enable(FALSE);
        } else {
            d->value = value;
        }
    }
}

double ui_double_get(UiDouble* d) {
    if (d) {
        return d->get ? d->get(d) : d->value;
    }
    else {
        return 0;
    }
}

void ui_string_set(UiString* s, const char* value) {
    if (s) {
        if (s->set) {
            ui_setop_enable(TRUE);
            s->set(s, value ? value : "");
            ui_setop_enable(FALSE);
        } else {
            if(s->value.free) {
                s->value.free(s->value.ptr);
            }
            if (value) {
                s->value.ptr = strdup(value);
                s->value.free = free;
            } else {
                s->value.ptr = NULL;
                s->value.free = NULL;
            }
        }
    }
}

char* ui_string_get(UiString* s) {
    if (s) {
        return s->get ? s->get(s) : s->value.ptr;
    }
    else {
        return NULL;
    }
}

void ui_text_set(UiText* s, const char* value) {
    if (s) {
        if (s->set) {
            ui_setop_enable(TRUE);
            s->set(s, value ? value : "");
            ui_setop_enable(FALSE);
        } else {
            if(s->value.free) {
                s->value.free(s->value.ptr);
            }
            if (value) {
                s->value.ptr = strdup(value);
                s->value.free = free;
            } else {
                s->value.ptr = NULL;
                s->value.free = NULL;
            }
        }
    }
}

char* ui_text_get(UiText* s) {
    if (s) {
        return s->get ? s->get(s) : s->value.ptr;
    }
    else {
        return NULL;
    }
}

void ui_range_set(UiRange *r, double value) {
    if (r) {
        if (r->set) {
            r->set(r, value);
        } else {
            r->value = value;
        }
    }
}

void ui_range_set_range(UiRange *r, double min, double max) {
    if (r) {
        if (r->setrange) {
            r->setrange(r, min, max);
        } else {
            r->min = min;
            r->max = max;
        }
    }
}

void ui_range_set_extent(UiRange *r, double extent) {
    if (r) {
        if (r->setextent) {
            r->setextent(r, extent);
        } else {
            r->extent = extent;
        }
    }
}

double ui_range_get(UiRange *r) {
    if (r) {
        return r->get ? r->get(r) : r->value;
    } else {
        return 0;
    }
}

double ui_range_get_min(UiRange *r) {
    if (r) {
        return r->min;
    } else {
        return 0;
    }
}

double ui_range_get_max(UiRange *r) {
    if (r) {
        return r->max;
    } else {
        return 0;
    }
}

double ui_range_get_extent(UiRange *r) {
    if (r) {
        return r->extent;
    } else {
        return 0;
    }
}

void ui_generic_set_image(UiGeneric *g, void *img) {
    if(g->set) {
        g->set(g, img, UI_IMAGE_OBJECT_TYPE);
    } else {
        if(g->value) {
            ui_image_unref(g->value);
        }
        ui_image_ref(img);
        g->value = img;
        g->type = UI_IMAGE_OBJECT_TYPE;
    }
}

void* ui_generic_get_image(UiGeneric *g) {
    if(g->type) {
        if(!strcmp(g->type, UI_IMAGE_OBJECT_TYPE)) {
            return g->value;
        } else {
            return NULL;
        }
    }
    return g->value;
}


// private functions
void uic_int_copy(UiInteger *from, UiInteger *to) {
    to->get = from->get;
    to->set = from->set;
    to->obj = from->obj;
}

void uic_double_copy(UiDouble *from, UiDouble *to) {
    to->get = from->get;
    to->set = from->set;
    to->obj = from->obj;
}

void uic_string_copy(UiString *from, UiString *to) {
    to->get = from->get;
    to->set = from->set;
    to->obj = from->obj;
}

void uic_text_copy(UiText *from, UiText *to) {
    to->get = from->get;
    to->set = from->set;
    to->getsubstr = from->getsubstr;
    to->insert = from->insert;
    to->replace = from->replace;
    to->setposition = from->setposition;
    to->position = from->position;
    to->showposition = from->showposition;
    to->setselection = from->setselection;
    to->selection = from->selection;
    to->length = from->length;
    to->remove = from->remove;
    to->restore = from->restore;
    to->save = from->save;
    to->destroy = from->destroy;
    
    to->obj = from->obj;
    // do not copy the undo manager, data1, data2
}

void uic_range_copy(UiRange *from, UiRange *to) {
    to->get = from->get;
    to->set = from->set;
    to->setrange = from->setrange;
    to->setextent = from->setextent;
    to->obj = from->obj;
}

void uic_list_copy(UiList *from, UiList *to) {
    to->update = from->update;
    to->getselection = from->getselection;
    to->setselection = from->setselection;
    to->obj = from->obj;
}

void uic_generic_copy(UiGeneric *from, UiGeneric *to) {
    to->get = from->get;
    to->get_type = from->get_type;
    to->set = from->set;
    to->obj = from->obj;
}

void uic_int_save(UiInteger *i) {
    if(!i->obj) return;
    i->value = i->get(i);
}

void uic_double_save(UiDouble *d) {
    if(!d->obj) return;
    d->value = d->get(d);
}

void uic_string_save(UiString *s) {
    if(!s->obj) return;
    s->get(s);
}

void uic_text_save(UiText *t) {
    if(!t->obj) return;
    t->save(t);
    t->position(t);
}

void uic_range_save(UiRange *r) {
    if(!r->obj) return;
    r->get(r);
}

void uic_generic_save(UiGeneric *g) {
    if(!g->obj) return;
    // TODO: this leaks memory
    // we can't just use get on Generic and ignore the result
    // probably a separate save method is required
    g->get(g);
}


void uic_int_unbind(UiInteger *i) {
    i->get = NULL;
    i->set = NULL;
    i->obj = NULL;
}

void uic_double_unbind(UiDouble *d) {
    d->get = NULL;
    d->set = NULL;
    d->obj = NULL;
}

void uic_string_unbind(UiString *s) {
    s->get = NULL;
    s->set = NULL;
    s->obj = NULL;
}

void uic_text_unbind(UiText *t) {
    t->obj = NULL;
    if(t->data1 && t->datatype == UI_TEXT_TYPE_BUFFER) {
        // the binding functions all work with t->data1, not t->obj
        // and we don't want to NULL them, because they will be still
        // functional even without a widget binding
        return;
    }
    
    t->set = NULL;
    t->get = NULL;
    t->getsubstr = NULL;
    t->insert = NULL;
    t->replace = NULL;
    t->setposition = NULL;
    t->position = NULL;
    t->selection = NULL;
    t->setselection = NULL;
    t->length = NULL;
    t->remove = NULL;
}

void uic_range_unbind(UiRange *r) {
    r->get = NULL;
    r->set = NULL;
    r->setextent = NULL;
    r->setrange = NULL;
    r->obj = NULL;
}

void uic_list_unbind(UiList *l) {
    l->update = NULL;
    l->getselection = NULL;
    l->setselection = NULL;
    l->obj = NULL;
}

void uic_generic_unbind(UiGeneric *g) {
    g->get = NULL;
    g->get_type = NULL;
    g->set = NULL;
    g->obj = NULL;
}


UiListSelection* ui_list_get_selection_allocated(UiList *list) {
    UiListSelection *sel = malloc(sizeof(UiListSelection));
    *sel = ui_list_get_selection(list);
    return sel;
    
}

void ui_list_selection_free(UiListSelection *sel) {
    if(!sel) {
        return;
    }
    ui_listselection_free(*sel);
    free(sel);
}


UIEXPORT int ui_list_getselection(UiList *list) {
    int selection = -1;
    if (list->getselection) {
        UiListSelection sel = list->getselection(list);
        if(sel.count > 0) {
            selection = sel.rows[0];
        }
        ui_listselection_free(sel);
    }
    return selection;
}

UIEXPORT void ui_list_setselection(UiList *list, int index) {
    ui_list_setselection2(list, index, TRUE);
}

UIEXPORT void ui_list_setselection2(UiList *list, int index, UiBool selection_event) {
    if (list->setselection) {
        UiListSelection sel = { 0, NULL };
        if(index >= 0) {
            sel.count = 1;
            sel.rows = &index;
        }
        UiBool events = ui_selection_events_is_enabled();
        if(!selection_event) {
            ui_selection_events_enable(FALSE);
        }
        list->setselection(list, sel);
        ui_selection_events_enable(events);
    }
}

UIEXPORT void ui_listselection_free(UiListSelection selection) {
    free(selection.rows);
}

UIEXPORT UiStr ui_str(char *cstr) {
    return (UiStr) { cstr, NULL };
}

UIEXPORT UiStr ui_str_free(char *str, void (*freefunc)(void *v)) {
    return (UiStr) { str, freefunc };
}


UIEXPORT UiFileList ui_filelist_copy(UiFileList list) {
    char **newlist = calloc(sizeof(char*), list.nfiles);
    for (int i = 0; i < list.nfiles; i++) {
        newlist[i] = strdup(list.files[i]);
    }
    return (UiFileList) { newlist, list.nfiles };
}

UIEXPORT void ui_filelist_free(UiFileList list) {
    for (int i = 0; i < list.nfiles; i++) {
        free(list.files[i]);
    }
    free(list.files);
}


typedef struct UiObserverDestructor {
    UiList *list;
    UiObserver *observer;
} UiObserverDestructor;

static void observer_destructor(UiObserverDestructor *destr) {
    UiObserver *remove_obs = destr->observer;
    UiObserver *obs = destr->list->observers;
    UiObserver *prev = NULL;
    while(obs) {
        if(obs == remove_obs) {
            if(prev) {
                prev->next = obs->next;
            } else {
                destr->list->observers = obs->next;
            }
            break;
        }
        prev = obs;
        obs = obs->next;
    }
    free(remove_obs);
}

void uic_list_register_observer_destructor(UiContext *ctx, UiList *list, UiObserver *observer) {
    CxMempool *mp = ctx->mp;
    UiObserverDestructor *destr = cxMalloc(mp->allocator, sizeof(UiObserverDestructor));
    destr->list = list;
    destr->observer = observer;
    cxMempoolSetDestructor(destr, (cx_destructor_func)observer_destructor);
}

static int ui_set_op = 0;
static int ui_onchange_events_enabled = TRUE;
static int ui_selection_events_enabled = TRUE;

void ui_setop_enable(int set) {
    ui_set_op = set;
}

int ui_get_setop(void) {
    return ui_set_op;
}

void ui_onchange_events_enable(UiBool enable) {
    ui_onchange_events_enabled = enable;
}

UiBool ui_onchange_events_is_enabled(void) {
    return ui_onchange_events_enabled;
}

void ui_selection_events_enable(UiBool enable) {
    ui_selection_events_enabled = enable;
}

UiBool ui_selection_events_is_enabled(void) {
    return ui_selection_events_enabled;
}

/* ---------------- List initializers and wrapper functions ---------------- */

void ui_global_list_initializer(ui_list_init_func func, void *userdata) {
    default_list_init = func;
    default_list_init_userdata = userdata;
}

void ui_global_list_destructor(ui_list_destroy_func func, void *userdata) {
    default_list_destroy = func;
    default_list_destroy_userdata = userdata;
}

UIEXPORT void ui_list_class_set_destructor(UiList *list, ui_list_destroy_func destroy) {
    list->destroy = destroy;
}

void ui_list_class_set_first(UiList *list, void*(*first)(UiList *list)) {
    list->first = first;
}

void ui_list_class_set_next(UiList *list, void*(*next)(UiList *list)) {
    list->next = next;
}

void ui_list_class_set_get(UiList *list, void*(*get)(UiList *list, int i)) {
    list->get = get;
}

void ui_list_class_set_count(UiList *list, int(*count)(UiList *list)) {
    list->count = count;
}

void ui_list_class_set_data(UiList *list, void *data) {
    list->data = data;
}

void ui_list_class_set_iter(UiList *list, void *iter) {
    list->iter = iter;
}

/* ---------------- Text functions ---------------- */

char* ui_text_getsubstr(UiText *text, int begin, int end) {
    if(text->getsubstr) {
        return text->getsubstr(text, begin, end);
    } else {
        return NULL;
    }
}

void  ui_text_insert(UiText *text, int pos, const char *str) {
    if(text->insert) {
        text->insert(text, pos, str);
    }
}

void  ui_text_replace(UiText *text, int begin, int end, const char *str) {
    if(text->replace) {
        text->replace(text, begin, end, str);
    }
}

void  ui_text_setposition(UiText *text, int pos) {
    if(text->setposition) {
        text->setposition(text, pos);
    }
}

int   ui_text_position(UiText *text) {
    if(text->position) {
        return text->position(text);
    } else {
        return 0;
    }
}

void  ui_text_showposition(UiText *text, int pos) {
    if(text->showposition) {
        text->showposition(text, pos);
    }
}

void  ui_text_setselection(UiText *text, int begin, int end) {
    if(text->setselection) {
        text->setselection(text, begin, end);
    }
}

void  ui_text_selection(UiText *text, int *begin, int *end) {
    if(text->selection) {
        text->selection(text, begin, end);
    } else {
        if(begin) {
            *begin = 0;
        }
        if(end) {
            *end = 0;
        }
    }
}

int   ui_text_length(UiText *text) {
    if(text->length) {
        return text->length(text);
    } else {
        return 0;
    }
}
void  ui_text_remove(UiText *text, int begin, int end) {
    if(text->remove) {
        text->remove(text, begin, end);
    }
}