ui/gtk/text.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 "text.h"
#include "container.h"

#include <cx/printf.h>

#include <gdk/gdkkeysyms.h>


#include "../common/types.h"

static void selection_handler(
        GtkTextBuffer *buf,
        GtkTextIter *location,
        GtkTextMark *mark,
        UiTextArea *textview)
{
    const char *mname = gtk_text_mark_get_name(mark);
    if(mname) {
        GtkTextIter begin;
        GtkTextIter end;
        int sel = gtk_text_buffer_get_selection_bounds (buf, &begin, &end);
        if(sel != textview->last_selection_state) {
            if(sel) {
                ui_set_group(textview->ctx, UI_GROUP_SELECTION);
            } else {
                ui_unset_group(textview->ctx, UI_GROUP_SELECTION);
            }
        }
        textview->last_selection_state = sel;
    }
}

static void textarea_set_text_funcs(UiText *value) {
    
}

#if GTK_MAJOR_VERSION == 2
static void textarea_set_undomgr(GtkWidget *text_area, UiText *value) {
    GtkTextBuffer *buf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(text_area));

    if(!value->data2) {
        value->data2 = ui_create_undomgr();
    }

    // register undo manager
    g_signal_connect(
            buf,
            "insert-text",
            G_CALLBACK(ui_textbuf_insert),
            var);
    g_signal_connect(
            buf,
            "delete-range",
            G_CALLBACK(ui_textbuf_delete),
            var); 
    g_signal_connect(
            buf,
            "mark-set",
            G_CALLBACK(selection_handler),
            uitext);
}
#endif

static GtkTextBuffer* create_textbuffer(UiTextArea *textarea) {
    GtkTextBuffer *buf = gtk_text_buffer_new(NULL);
    if(textarea) {
        g_signal_connect(
                buf,
                "changed",
                G_CALLBACK(ui_textbuf_changed),
                textarea);
    } else {
        fprintf(stderr, "Error: create_textbuffer: textarea == NULL\n");
    }
    return buf;
}

UIWIDGET ui_textarea_create(UiObject *obj, UiTextAreaArgs *args) {
    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, args->value, args->varname, UI_VAR_TEXT);
    
    GtkWidget *text_area = gtk_text_view_new();
    ui_set_name_and_style(text_area, args->name, args->style_class);
    ui_set_widget_groups(obj->ctx, text_area, args->groups);
    
    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(text_area), GTK_WRAP_WORD_CHAR);
    g_signal_connect(
            text_area,
            "realize",
            G_CALLBACK(ui_textarea_realize_event),
            NULL);
    
    UiTextArea *uitext = malloc(sizeof(UiTextArea));
    uitext->obj = obj;
    uitext->ctx = obj->ctx;
    uitext->var = var;
    uitext->last_selection_state = 0;
    uitext->onchange = args->onchange;
    uitext->onchangedata = args->onchangedata;
    
    g_object_set_data(G_OBJECT(text_area), "ui_textarea", uitext);
    
    g_signal_connect(
                text_area,
                "destroy",
                G_CALLBACK(ui_textarea_destroy),
                uitext);
    
    GtkWidget *scroll_area = SCROLLEDWINDOW_NEW();
    gtk_scrolled_window_set_policy(
            GTK_SCROLLED_WINDOW(scroll_area),
            GTK_POLICY_AUTOMATIC,
            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
    SCROLLEDWINDOW_SET_CHILD(scroll_area, text_area);
    
    if(args->width > 0 || args->height > 0) {
        int width = args->width;
        int height = args->height;
        if(width == 0) {
            width = -1;
        }
        if(height == 0) {
            height = -1;
        }
        gtk_widget_set_size_request(scroll_area, width, height);
    }
    
    // font and padding
    //PangoFontDescription *font;
    //font = pango_font_description_from_string("Monospace");
    //gtk_widget_modify_font(text_area, font); // TODO
    //pango_font_description_free(font);
    
    gtk_text_view_set_left_margin(GTK_TEXT_VIEW(text_area), 2);
    gtk_text_view_set_right_margin(GTK_TEXT_VIEW(text_area), 2);
    
    // add
    UiContainerPrivate *ct = (UiContainerPrivate*)obj->container_end;
    UiLayout layout = UI_ARGS2LAYOUT(args);
    ct->add(ct, scroll_area, &layout);
    
    // bind value
    if(var) {
        UiText *value = var->value;
        GtkTextBuffer *buf;
        if(value->data1 && value->datatype == UI_TEXT_TYPE_BUFFER) {
            buf = value->data1;
        } else {
            buf = create_textbuffer(uitext);
            if(value->value.ptr) {
                gtk_text_buffer_set_text(buf, value->value.ptr, -1);
                value->value.free(value->value.ptr);
            }
        }
        gtk_text_view_set_buffer(GTK_TEXT_VIEW(text_area), buf);
        value->obj = text_area;
        value->save = ui_textarea_save;
        value->restore = ui_textarea_restore;
        value->destroy = ui_textarea_text_destroy;
        value->get = ui_textarea_get;
        value->set = ui_textarea_set;
        value->getsubstr = ui_textarea_getsubstr;
        value->insert = ui_textarea_insert;
        value->setposition = ui_textarea_setposition;
        value->position = ui_textarea_position;
        value->selection = ui_textarea_selection;
        value->length = ui_textarea_length;
        value->remove = ui_textarea_remove;
        value->data1 = buf;
        value->data2 = NULL;
        value->datatype == UI_TEXT_TYPE_BUFFER;
        value->value.ptr = NULL;
        value->value.free = NULL;
        
#if GTK_MAJOR_VERSION == 2
        textarea_set_undomgr(text_area, value);
#endif
    }
    
    return scroll_area;
}

void ui_textarea_destroy(GtkWidget *object, UiTextArea *textarea) {
    if(textarea->var) {
        ui_destroy_boundvar(textarea->ctx, textarea->var);
    }
    free(textarea);
}

UIWIDGET ui_textarea_gettextwidget(UIWIDGET textarea) {
    return SCROLLEDWINDOW_GET_CHILD(textarea);
}

void ui_textarea_save(UiText *text) {
    // NOOP
}

void ui_textarea_restore(UiText *text) {
    GtkWidget *textarea = text->obj;
    if(!text->data1) {
        text->data1 = create_textbuffer(g_object_get_data(G_OBJECT(textarea), "ui_textarea"));
        text->datatype = UI_TEXT_TYPE_BUFFER;
    }
    gtk_text_view_set_buffer(GTK_TEXT_VIEW(textarea), text->data1);
}

void ui_textarea_text_destroy(UiText *text) {
    GtkTextBuffer *buf = text->data1;
    g_object_unref(buf);
}

char* ui_textarea_get(UiText *text) {
    if(text->value.ptr) {
        text->value.free(text->value.ptr);
    }
    GtkTextBuffer *buf = text->data1;
    GtkTextIter start;
    GtkTextIter end;
    gtk_text_buffer_get_bounds(buf, &start, &end);
    char *str = gtk_text_buffer_get_text(buf, &start, &end, FALSE);
    text->value.ptr = g_strdup(str);
    text->value.free = (ui_freefunc)g_free;
    return str;
}

void ui_textarea_set(UiText *text, const char *str) {
    gtk_text_buffer_set_text((GtkTextBuffer*)text->data1, str, -1);
    if(text->value.ptr) {
        text->value.free(text->value.ptr);
    }
    text->value.ptr = NULL;
    text->value.free = NULL;
}

char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
    if(text->value.ptr) {
        text->value.free(text->value.ptr);
    }
    GtkTextBuffer *buf = text->data1;
    GtkTextIter ib;
    GtkTextIter ie;
    gtk_text_buffer_get_iter_at_offset(text->data1, &ib, begin);
    gtk_text_buffer_get_iter_at_offset(text->data1, &ie, end);
    char *str = gtk_text_buffer_get_text(buf, &ib, &ie, FALSE);
    text->value.ptr = g_strdup(str);
    text->value.free = (ui_freefunc)g_free;
    return str;
}

void ui_textarea_insert(UiText *text, int pos, char *str) {
    GtkTextIter offset;
    gtk_text_buffer_get_iter_at_offset(text->data1, &offset, pos);
    gtk_text_buffer_insert(text->data1, &offset, str, -1);
    if(text->value.ptr) {
        text->value.free(text->value.ptr);
    }
    text->value.ptr = NULL;
    text->value.free = NULL;
}

void ui_textarea_setposition(UiText *text, int pos) {
    GtkTextIter iter;
    gtk_text_buffer_get_iter_at_offset(text->data1, &iter, pos);
    gtk_text_buffer_place_cursor(text->data1, &iter);
}

int ui_textarea_position(UiText *text) {
    GtkTextIter begin;
    GtkTextIter end;
    gtk_text_buffer_get_selection_bounds(text->data1, &begin, &end);
    text->pos = gtk_text_iter_get_offset(&begin);
    return text->pos;
}

void ui_textarea_selection(UiText *text, int *begin, int *end) {
    GtkTextIter b;
    GtkTextIter e;
    gtk_text_buffer_get_selection_bounds(text->data1, &b, &e);
    *begin = gtk_text_iter_get_offset(&b);
    *end = gtk_text_iter_get_offset(&e);
}

int ui_textarea_length(UiText *text) {
    GtkTextBuffer *buf = text->data1;
    GtkTextIter start;
    GtkTextIter end;
    gtk_text_buffer_get_bounds(buf, &start, &end);
    return gtk_text_iter_get_offset(&end);
}

void ui_textarea_remove(UiText *text, int begin, int end) {
    GtkTextBuffer *buf = text->data1;
    GtkTextIter ib;
    GtkTextIter ie;
    gtk_text_buffer_get_iter_at_offset(buf, &ib, begin);
    gtk_text_buffer_get_iter_at_offset(buf, &ie, end);
    gtk_text_buffer_delete(buf, &ib, &ie);
}

void ui_textarea_realize_event(GtkWidget *widget, gpointer data) {
    gtk_widget_grab_focus(widget);
}


void ui_textbuf_changed(GtkTextBuffer *textbuffer, UiTextArea *textarea) {
    UiText *value = textarea->var->value;
    
    UiEvent e;
    e.obj = textarea->obj;
    e.window = e.obj->window;
    e.document = textarea->ctx->document;
    e.eventdata = value;
    e.eventdatatype = UI_EVENT_DATA_TEXT_VALUE;
    e.intval = 0;
    e.set = ui_get_setop();
    
    if(textarea->onchange) {
        textarea->onchange(&e, textarea->onchangedata);
    }
    
    if(value->observers) {
        ui_notify_evt(value->observers, &e);
    }
}

// undo manager functions

void ui_textbuf_insert(
        GtkTextBuffer *textbuffer,
        GtkTextIter *location,
        char *text,
        int length,
        void *data)
{
    UiVar *var = data;
    UiText *value = var->value;
    if(!value->data2) {
        value->data2 = ui_create_undomgr();
    }
    UiUndoMgr *mgr = value->data2;
    if(!mgr->event) {
        return;
    }
    
    if(mgr->cur) {
        UiTextBufOp *elm = mgr->cur->next;
        if(elm) {
            mgr->cur->next = NULL;
            mgr->end = mgr->cur;
            while(elm) {
                elm->prev = NULL;   
                UiTextBufOp *next = elm->next;
                ui_free_textbuf_op(elm);
                elm = next;
            }
        }
        
        UiTextBufOp *last_op = mgr->cur;
        if(
            last_op->type == UI_TEXTBUF_INSERT &&
            ui_check_insertstr(last_op->text, last_op->len, text, length) == 0)
        {
            // append text to last op       
            int ln = last_op->len;
            char *newtext = malloc(ln + length + 1);
            memcpy(newtext, last_op->text, ln);
            memcpy(newtext+ln, text, length);
            newtext[ln+length] = '\0';
            
            last_op->text = newtext;
            last_op->len = ln + length;
            last_op->end += length;
            
            return;
        }
    }
    
    char *dpstr = malloc(length + 1);
    memcpy(dpstr, text, length);
    dpstr[length] = 0;
    
    UiTextBufOp *op = malloc(sizeof(UiTextBufOp));
    op->prev = NULL;
    op->next = NULL;
    op->type = UI_TEXTBUF_INSERT;
    op->start = gtk_text_iter_get_offset(location);
    op->end = op->start+length;
    op->len = length;
    op->text = dpstr;
    
    cx_linked_list_add(
            (void**)&mgr->begin,
            (void**)&mgr->end,
            offsetof(UiTextBufOp, prev),
            offsetof(UiTextBufOp, next),
            op);
    
    mgr->cur = op;
}

void ui_textbuf_delete(
        GtkTextBuffer *textbuffer,
        GtkTextIter *start,
        GtkTextIter *end,
        void *data)
{
    UiVar *var = data;
    UiText *value = var->value;
    if(!value->data2) {
        value->data2 = ui_create_undomgr();
    }
    UiUndoMgr *mgr = value->data2;
    if(!mgr->event) {
        return;
    }
    
    if(mgr->cur) {
        UiTextBufOp *elm = mgr->cur->next;
        if(elm) {
            mgr->cur->next = NULL;
            mgr->end = mgr->cur;
            while(elm) {
                elm->prev = NULL;   
                UiTextBufOp *next = elm->next;
                ui_free_textbuf_op(elm);
                elm = next;
            }
        }
    }
    
    char *text = gtk_text_buffer_get_text(value->obj, start, end, FALSE);
    
    UiTextBufOp *op = malloc(sizeof(UiTextBufOp));
    op->prev = NULL;
    op->next = NULL;
    op->type = UI_TEXTBUF_DELETE;
    op->start = gtk_text_iter_get_offset(start);
    op->end = gtk_text_iter_get_offset(end);
    op->len = op->end - op->start;
    
    char *dpstr = malloc(op->len + 1);
    memcpy(dpstr, text, op->len);
    dpstr[op->len] = 0;
    op->text = dpstr;
    
    cx_linked_list_add(
            (void**)&mgr->begin,
            (void**)&mgr->end,
            offsetof(UiTextBufOp, prev),
            offsetof(UiTextBufOp, next),
            op);
    
    mgr->cur = op;
}

UiUndoMgr* ui_create_undomgr() {
    UiUndoMgr *mgr = malloc(sizeof(UiUndoMgr));
    mgr->begin = NULL;
    mgr->end = NULL;
    mgr->cur = NULL;
    mgr->length = 0;
    mgr->event = 1;
    return mgr;
}

void ui_destroy_undomgr(UiUndoMgr *mgr) {
    UiTextBufOp *op = mgr->begin;
    while(op) {
        UiTextBufOp *nextOp = op->next;
        if(op->text) {
            free(op->text);
        }
        free(op);
        op = nextOp;
    }
    free(mgr);
}

void ui_free_textbuf_op(UiTextBufOp *op) {
    if(op->text) {
        free(op->text);
    }
    free(op);
}

int ui_check_insertstr(char *oldstr, int oldlen, char *newstr, int newlen) {
    // return 1 if oldstr + newstr are one word
    
    int has_space = 0;
    for(int i=0;i<oldlen;i++) {
        if(oldstr[i] < 33) {
            has_space = 1;
            break;
        }
    }
    
    for(int i=0;i<newlen;i++) {
        if(has_space && newstr[i] > 32) {
            return 1;
        }
    }
    
    return 0;
}

void ui_text_undo(UiText *value) {
    UiUndoMgr *mgr = value->data2;
    
    if(mgr->cur) {
        UiTextBufOp *op = mgr->cur;
        mgr->event = 0;
        switch(op->type) {
            case UI_TEXTBUF_INSERT: {
                GtkTextIter begin;
                GtkTextIter end;
                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
                gtk_text_buffer_delete(value->obj, &begin, &end);
                break;
            }
            case UI_TEXTBUF_DELETE: {
                GtkTextIter begin;
                GtkTextIter end;
                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
                gtk_text_buffer_insert(value->obj, &begin, op->text, op->len);
                break;
            }
        }
        mgr->event = 1;
        mgr->cur = mgr->cur->prev;
    }
}

void ui_text_redo(UiText *value) {
    UiUndoMgr *mgr = value->data2;
    
    UiTextBufOp *elm = NULL;
    if(mgr->cur) {
        if(mgr->cur->next) {
            elm = mgr->cur->next;
        }
    } else if(mgr->begin) {
        elm = mgr->begin;
    }
    
    if(elm) {
        UiTextBufOp *op = elm;
        mgr->event = 0;
        switch(op->type) {
            case UI_TEXTBUF_INSERT: {
                GtkTextIter begin;
                GtkTextIter end;
                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
                gtk_text_buffer_insert(value->obj, &begin, op->text, op->len);
                break;
            }
            case UI_TEXTBUF_DELETE: {
                GtkTextIter begin;
                GtkTextIter end;
                gtk_text_buffer_get_iter_at_offset(value->obj, &begin, op->start);
                gtk_text_buffer_get_iter_at_offset(value->obj, &end, op->end);
                gtk_text_buffer_delete(value->obj, &begin, &end);
                break;
            }
        }
        mgr->event = 1;
        mgr->cur = elm;
    }
}


static UIWIDGET create_textfield(UiObject *obj, UiBool frameless, UiBool password, UiTextFieldArgs *args) {
    GtkWidget *textfield = gtk_entry_new();
    ui_set_name_and_style(textfield, args->name, args->style_class);
    ui_set_widget_groups(obj->ctx, textfield, args->groups);
    
    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, args->value, args->varname, UI_VAR_STRING);
    
    UiTextField *uitext = malloc(sizeof(UiTextField));
    uitext->obj = obj;
    uitext->var = var;
    uitext->onchange = args->onchange;
    uitext->onchangedata = args->onchangedata;
    uitext->onactivate = args->onactivate;
    uitext->onactivatedata = args->onactivatedata;
    
    g_signal_connect(
                textfield,
                "destroy",
                G_CALLBACK(ui_textfield_destroy),
                uitext);
    
    if(args->width > 0) {
        // An early implementation used gtk_entry_set_width_chars,
        // but that is not available on gtk4 and other toolkits
        // also don't have this. Setting the width in pixels can
        // be implemented on all platforms
        gtk_widget_set_size_request(textfield, args->width, -1);
    }
    if(frameless) {
        // TODO: gtk2legacy workaroud
        gtk_entry_set_has_frame(GTK_ENTRY(textfield), FALSE);
    }
    if(password) {
        gtk_entry_set_visibility(GTK_ENTRY(textfield), FALSE);
    }
    
    UiContainerPrivate *ct = (UiContainerPrivate*)obj->container_end;
    UiLayout layout = UI_ARGS2LAYOUT(args);
    ct->add(ct, textfield, &layout);
    
    if(var) {
        UiString *value = var->value;
        if(value->value.ptr) {
            ENTRY_SET_TEXT(textfield, value->value.ptr);
            value->value.free(value->value.ptr);
            value->value.ptr = NULL;
            value->value.free = NULL;
        }
        
        value->get = ui_textfield_get;
        value->set = ui_textfield_set;
        value->value.ptr = NULL;
        value->value.free = NULL;
        value->obj = GTK_ENTRY(textfield);
    }
    
    if(args->onchange || var) {
        g_signal_connect(
                textfield,
                "changed",
                G_CALLBACK(ui_textfield_changed),
                uitext);
    }
    
    if(args->onactivate) {
        g_signal_connect(
                textfield,
                "activate",
                G_CALLBACK(ui_textfield_activate),
                uitext);
    }
    
    return textfield;
}

UIWIDGET ui_textfield_create(UiObject *obj, UiTextFieldArgs *args) {
    return create_textfield(obj, FALSE, FALSE, args);
}

UIWIDGET ui_frameless_textfield_create(UiObject* obj, UiTextFieldArgs *args) {
    return create_textfield(obj, TRUE, FALSE, args);
}

UIWIDGET ui_passwordfield_create(UiObject* obj, UiTextFieldArgs *args) {
    return create_textfield(obj, FALSE, TRUE, args);
}


void ui_textfield_destroy(GtkWidget *object, UiTextField *textfield) {
    free(textfield);
}

void ui_textfield_changed(GtkEditable *editable, UiTextField *textfield) {
    UiString *value = textfield->var->value;
    
    UiEvent e;
    e.obj = textfield->obj;
    e.window = e.obj->window;
    e.document = textfield->obj->ctx->document;
    e.eventdata = value;
    e.eventdatatype = UI_EVENT_DATA_TEXT_VALUE;
    e.intval = 0;
    e.set = ui_get_setop();
    
    if(textfield->onchange) {
        textfield->onchange(&e, textfield->onchangedata);
    }
    
    if(textfield->var) {
        ui_notify_evt(value->observers, &e);
    }
}

void ui_textfield_activate(GtkEntry* self, UiTextField *textfield) {
    if(textfield->onactivate) {
        UiEvent e;
        e.obj = textfield->obj;
        e.window = e.obj->window;
        e.document = textfield->obj->ctx->document;
        e.eventdata = NULL;
        e.eventdatatype = 0;
        e.intval = 0;
        e.set = ui_get_setop();
        textfield->onactivate(&e, textfield->onactivatedata);
    }
}

char* ui_textfield_get(UiString *str) {
    if(str->value.ptr) {
        str->value.free(str->value.ptr);
    }
    str->value.ptr = g_strdup(ENTRY_GET_TEXT(str->obj));
    str->value.free = (ui_freefunc)g_free;
    return str->value.ptr;
}

void ui_textfield_set(UiString *str, const char *value) {
    ENTRY_SET_TEXT(str->obj, value);
    if(str->value.ptr) {
        str->value.free(str->value.ptr);
        str->value.ptr = NULL;
        str->value.free = NULL;
    }
}

// ----------------------- path textfield -----------------------

// TODO: move to common
static UiPathElm* default_pathelm_func(const char* full_path, size_t len, size_t* ret_nelm, void* data) {
    cxstring *pathelms;
    size_t nelm = cx_strsplit_a(cxDefaultAllocator, cx_strn(full_path, len), CX_STR("/"), 4096, &pathelms);

    if (nelm == 0) {
        *ret_nelm = 0;
        return NULL;
    }

    UiPathElm* elms = (UiPathElm*)calloc(nelm, sizeof(UiPathElm));
    size_t n = nelm;
    int j = 0;
    for (int i = 0; i < nelm; i++) {
        cxstring c = pathelms[i];
        if (c.length == 0) {
            if (i == 0) {
                c.length = 1;
            }
            else {
                n--;
                continue;
            }
        }

        cxmutstr m = cx_strdup(c);
        elms[j].name = m.ptr;
        elms[j].name_len = m.length;
        
        size_t elm_path_len = c.ptr + c.length - full_path;
        cxmutstr elm_path = cx_strdup(cx_strn(full_path, elm_path_len));
        elms[j].path = elm_path.ptr;
        elms[j].path_len = elm_path.length;

        j++;
    }
    *ret_nelm = n;

    return elms;
}

static void ui_pathelm_destroy(UiPathElm *elms, size_t nelm) {
    for(int i=0;i<nelm;i++) {
        free(elms[i].name);
        free(elms[i].path);
    }
    free(elms);
}

static void ui_path_textfield_destroy(GtkWidget *object, UiPathTextField *pathtf) {
    g_object_unref(pathtf->entry);
    free(pathtf);
}

void ui_path_button_clicked(GtkWidget *widget, UiEventDataExt *event) {
    UiPathTextField *pathtf = event->customdata1;
    for(int i=0;i<event->value1;i++) {
        if(i <= event->value0) {
            WIDGET_REMOVE_CSS_CLASS(pathtf->current_path_buttons[i], "pathbar-button-inactive");
        } else {
            WIDGET_ADD_CSS_CLASS(pathtf->current_path_buttons[i], "pathbar-button-inactive");
        }
    }
    
    UiPathElm *elm = event->customdata0;
    cxmutstr path = cx_strdup(cx_strn(elm->path, elm->path_len));
    UiEvent evt;
    evt.obj = event->obj;
    evt.window = evt.obj->window;
    evt.document = evt.obj->ctx->document;
    evt.eventdata = elm->path;
    evt.eventdatatype = UI_EVENT_DATA_STRING;
    evt.intval = event->value0;
    evt.set = ui_get_setop();
    event->callback(&evt, event->userdata);
    free(path.ptr);
}

int ui_pathtextfield_update(UiPathTextField* pathtf, const char *full_path) {
    size_t full_path_len = strlen(full_path);
    if(full_path_len == 0) {
        return 1;
    }
    
    size_t nelm = 0;
    UiPathElm* path_elm = pathtf->getpathelm(full_path, full_path_len, &nelm, pathtf->getpathelmdata);
    if (!path_elm) {
        return 1;
    }
    
    free(pathtf->current_path);
    pathtf->current_path = strdup(full_path);
    
    ui_pathelm_destroy(pathtf->current_pathelms, pathtf->current_nelm);
    free(pathtf->current_path_buttons);
    pathtf->current_path_buttons = calloc(nelm, sizeof(GtkWidget*));
    pathtf->current_pathelms = path_elm;
    pathtf->current_nelm = nelm;
    
    return ui_pathtextfield_update_widget(pathtf);
}

static GtkWidget* ui_path_elm_button(UiPathTextField *pathtf, UiPathElm *elm, int i) {
    cxmutstr name = cx_strdup(cx_strn(elm->name, elm->name_len));
    GtkWidget *button = gtk_button_new_with_label(name.ptr);
    pathtf->current_path_buttons[i] = button;
    free(name.ptr);

    if(pathtf->onactivate) {
        UiEventDataExt *eventdata = malloc(sizeof(UiEventDataExt));
        memset(eventdata, 0, sizeof(UiEventDataExt));
        eventdata->callback = pathtf->onactivate;
        eventdata->userdata = pathtf->onactivatedata;
        eventdata->obj = pathtf->obj;
        eventdata->customdata0 = elm;
        eventdata->customdata1 = pathtf;
        eventdata->value0 = i;
        eventdata->value1 = pathtf->current_nelm;        

        g_signal_connect(
                button,
                "clicked",
                G_CALLBACK(ui_path_button_clicked),
                eventdata);

        g_signal_connect(
                button,
                "destroy",
                G_CALLBACK(ui_destroy_userdata),
                eventdata);
    }
    
    return button;
}

static void ui_path_textfield_activate(GtkWidget *entry, UiPathTextField *pathtf) {
    const gchar *text = ENTRY_GET_TEXT(pathtf->entry);
    if(strlen(text) == 0) {
        return;
    }
    
    UiObject *obj = pathtf->obj;
    
    if(ui_pathtextfield_update(pathtf, text)) {
        return;
    }
    
    if(pathtf->onactivate) {
        UiEvent evt;
        evt.obj = obj;
        evt.window = obj->window;
        evt.document = obj->ctx->document;
        evt.eventdata = (char*)text;
        evt.eventdatatype = UI_EVENT_DATA_STRING;
        evt.intval = -1;
        pathtf->onactivate(&evt, pathtf->onactivatedata);
    }
}

#if GTK_MAJOR_VERSION >= 4

static void pathbar_show_hbox(GtkWidget *widget, UiPathTextField *pathtf) {
    if(pathtf->current_path) {
        gtk_stack_set_visible_child(GTK_STACK(pathtf->stack), pathtf->hbox);
        ENTRY_SET_TEXT(pathtf->entry, pathtf->current_path);
    }
}

static gboolean ui_path_textfield_key_controller(
        GtkEventControllerKey* self,
        guint keyval,
        guint keycode,
        GdkModifierType state,
        UiPathTextField *pathtf)
{
    if(keyval == GDK_KEY_Escape) {
        pathbar_show_hbox(NULL, pathtf);
    }
    return FALSE;
}

UIWIDGET ui_path_textfield_create(UiObject* obj, UiPathTextFieldArgs *args) {
    UiPathTextField *pathtf = malloc(sizeof(UiPathTextField));
    memset(pathtf, 0, sizeof(UiPathTextField));
    pathtf->obj = obj;
    pathtf->getpathelm = args->getpathelm;
    pathtf->getpathelmdata = args->getpathelmdata;
    pathtf->onactivate = args->onactivate;
    pathtf->onactivatedata = args->onactivatedata;
    pathtf->ondragcomplete = args->ondragcomplete;
    pathtf->ondragcompletedata = args->ondragcompletedata;
    pathtf->ondragstart = args->ondragstart;
    pathtf->ondragstartdata = args->ondragstartdata;
    pathtf->ondrop = args->ondrop;
    pathtf->ondropdata = args->ondropsdata;
    
    if(!pathtf->getpathelm) {
        pathtf->getpathelm = default_pathelm_func;
        pathtf->getpathelmdata = NULL;
    }
    
    pathtf->stack = gtk_stack_new();
    gtk_widget_set_name(pathtf->stack, "path-textfield-box");
    
    UiContainerPrivate *ct = (UiContainerPrivate*)obj->container_end;
    UiLayout layout = UI_ARGS2LAYOUT(args);
    ct->add(ct, pathtf->stack, &layout);
    
    pathtf->entry_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
    pathtf->entry = gtk_entry_new();
    gtk_box_append(GTK_BOX(pathtf->entry_box), pathtf->entry);
    gtk_widget_set_hexpand(pathtf->entry, TRUE);
    
    GtkWidget *cancel_button = gtk_button_new_from_icon_name("window-close-symbolic");
    gtk_widget_add_css_class(cancel_button, "flat");
    gtk_widget_add_css_class(cancel_button, "pathbar-extra-button");
    gtk_box_append(GTK_BOX(pathtf->entry_box), cancel_button);
    g_signal_connect(
                cancel_button,
                "clicked",
                G_CALLBACK(pathbar_show_hbox),
                pathtf);
    
    gtk_stack_add_child(GTK_STACK(pathtf->stack), pathtf->entry_box);
    g_object_ref(pathtf->entry); // for compatibility with older pathbar version
    g_signal_connect(
            pathtf->entry,
            "activate",
            G_CALLBACK(ui_path_textfield_activate),
            pathtf);
    
    GtkEventController *entry_cancel = gtk_event_controller_key_new();
    gtk_widget_add_controller(pathtf->entry, entry_cancel);
    g_signal_connect(entry_cancel, "key-pressed", G_CALLBACK(ui_path_textfield_key_controller), pathtf);
    
    gtk_stack_set_visible_child(GTK_STACK(pathtf->stack), pathtf->entry_box);
    
    
    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, args->value, args->varname, UI_VAR_STRING);
    if (var) {
        UiString* value = (UiString*)var->value;
        value->obj = pathtf;
        value->get = ui_path_textfield_get;
        value->set = ui_path_textfield_set;
        
        if(value->value.ptr) {
            char *str = strdup(value->value.ptr);
            ui_string_set(value, str);
            free(str);
        }
    }
    
    return pathtf->stack;    
}

static void pathbar_pressed(
        GtkGestureClick* self,
        gint n_press,
        gdouble x,
        gdouble y,
        UiPathTextField *pathtf)
{
    gtk_stack_set_visible_child(GTK_STACK(pathtf->stack), pathtf->entry_box);
    gtk_widget_grab_focus(pathtf->entry);
}

int ui_pathtextfield_update_widget(UiPathTextField* pathtf) {
    // recreate button hbox
    if(pathtf->hbox) {
        gtk_stack_remove(GTK_STACK(pathtf->stack), pathtf->hbox);
    }
    pathtf->hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
    gtk_box_set_homogeneous(GTK_BOX(pathtf->hbox), FALSE);
    gtk_stack_add_child(GTK_STACK(pathtf->stack), pathtf->hbox);
    gtk_widget_set_name(pathtf->hbox, "pathbar");
    
    // add buttons for path elements
    for (int i=0;i<pathtf->current_nelm;i++) {
        UiPathElm *elm = &pathtf->current_pathelms[i];
        
        GtkWidget *button = ui_path_elm_button(pathtf, elm, i);
        gtk_widget_add_css_class(button, "flat");
        
        gtk_box_append(GTK_BOX(pathtf->hbox), button);
        
        if(i+1 < pathtf->current_nelm && cx_strcmp(cx_strn(elm->name, elm->name_len), CX_STR("/"))) {
            GtkWidget *path_separator = gtk_label_new("/");
            gtk_widget_add_css_class(path_separator, "pathbar-button-inactive");
            gtk_box_append(GTK_BOX(pathtf->hbox), path_separator);
        }
    }
    gtk_stack_set_visible_child(GTK_STACK(pathtf->stack), pathtf->hbox);
    
    // create a widget for receiving button press events
    GtkWidget *event_area = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
    GtkGesture *handler = gtk_gesture_click_new();
    gtk_widget_add_controller(event_area, GTK_EVENT_CONTROLLER(handler));
    g_signal_connect(
                handler,
                "pressed",
                G_CALLBACK(pathbar_pressed),
                pathtf);
    gtk_widget_set_hexpand(event_area, TRUE);
    gtk_widget_set_vexpand(event_area, TRUE);
    gtk_box_append(GTK_BOX(pathtf->hbox), event_area);
    
    return 0;
}

#else

static gboolean path_textfield_btn_pressed(GtkWidget *widget, GdkEventButton *event, UiPathTextField *pathtf) {
    gtk_box_pack_start(GTK_BOX(pathtf->hbox), pathtf->entry, TRUE, TRUE, 0);
    gtk_container_remove(GTK_CONTAINER(pathtf->hbox), pathtf->buttonbox);
    pathtf->buttonbox = NULL;
    
    gtk_widget_show(pathtf->entry);
    gtk_widget_grab_focus(pathtf->entry);    
    
    return TRUE;
}

static gboolean ui_path_textfield_key_press(GtkWidget *self, GdkEventKey *event, UiPathTextField *pathtf) {
    if (event->keyval == GDK_KEY_Escape) {
        // reset GtkEntry value
        gtk_entry_set_text(GTK_ENTRY(self), pathtf->current_path);
        const gchar *text = gtk_entry_get_text(GTK_ENTRY(self));
        ui_pathtextfield_update(pathtf, text);
        return TRUE;
    }
    return FALSE;
}

static GtkWidget* create_path_button_box() {
    GtkWidget *bb = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
    gtk_button_box_set_layout(GTK_BUTTON_BOX(bb), GTK_BUTTONBOX_EXPAND); // linked style
    gtk_box_set_homogeneous(GTK_BOX(bb), FALSE);
    gtk_box_set_spacing(GTK_BOX(bb), 0);
    return bb;
}

UIWIDGET ui_path_textfield_create(UiObject* obj, UiPathTextFieldArgs *args) {
    UiPathTextField *pathtf = malloc(sizeof(UiPathTextField));
    memset(pathtf, 0, sizeof(UiPathTextField));
    pathtf->obj = obj;
    pathtf->getpathelm = args->getpathelm;
    pathtf->getpathelmdata = args->getpathelmdata;
    pathtf->onactivate = args->onactivate;
    pathtf->onactivatedata = args->onactivatedata;
    pathtf->ondragcomplete = args->ondragcomplete;
    pathtf->ondragcompletedata = args->ondragcompletedata;
    pathtf->ondragstart = args->ondragstart;
    pathtf->ondragstartdata = args->ondragstartdata;
    pathtf->ondrop = args->ondrop;
    pathtf->ondropdata = args->ondropsdata;
    
    if(!pathtf->getpathelm) {
        pathtf->getpathelm = default_pathelm_func;
        pathtf->getpathelmdata = NULL;
    }
    
    // top level container for the path textfield is a GtkEventBox
    // the event box is needed to handle background button presses
    GtkWidget *eventbox = gtk_event_box_new();
    g_signal_connect(
            eventbox,
            "button-press-event",
            G_CALLBACK(path_textfield_btn_pressed),
            pathtf);
    g_signal_connect(
            eventbox,
            "destroy",
            G_CALLBACK(ui_path_textfield_destroy),
            pathtf);
    
    UiContainerPrivate *ct = (UiContainerPrivate*)obj->container_end;
    UiLayout layout = UI_ARGS2LAYOUT(args);
    ct->add(ct, eventbox, &layout);
    
    // hbox as parent for the GtkEntry and GtkButtonBox
    GtkWidget *hbox = ui_gtk_hbox_new(0);
    pathtf->hbox = hbox;
    gtk_container_add(GTK_CONTAINER(eventbox), hbox);
    gtk_widget_set_name(hbox, "path-textfield-box");
    
    // create GtkEntry, that is also visible by default (with input yet)
    pathtf->entry = gtk_entry_new();
    g_object_ref(G_OBJECT(pathtf->entry));
    gtk_box_pack_start(GTK_BOX(hbox), pathtf->entry, TRUE, TRUE, 0);
    
    g_signal_connect(
            pathtf->entry,
            "activate",
            G_CALLBACK(ui_path_textfield_activate),
            pathtf);
    g_signal_connect(
            pathtf->entry,
            "key-press-event",
            G_CALLBACK(ui_path_textfield_key_press),
            pathtf);
    
    UiVar* var = uic_widget_var(obj->ctx, obj->ctx, args->value, args->varname, UI_VAR_STRING);
    if (var) {
        UiString* value = (UiString*)var->value;
        value->obj = pathtf;
        value->get = ui_path_textfield_get;
        value->set = ui_path_textfield_set;
        
        if(value->value.ptr) {
            char *str = strdup(value->value.ptr);
            ui_string_set(value, str);
            free(str);
        }
    }
    
    return hbox;
}

int ui_pathtextfield_update_widget(UiPathTextField* pathtf) {
    GtkWidget *buttonbox = create_path_button_box();
    
    // switch from entry to buttonbox or remove current buttonbox
    if(pathtf->buttonbox) {
        gtk_container_remove(GTK_CONTAINER(pathtf->hbox), pathtf->buttonbox);
    } else {
        gtk_container_remove(GTK_CONTAINER(pathtf->hbox), pathtf->entry);
    }
    gtk_box_pack_start(GTK_BOX(pathtf->hbox), buttonbox, FALSE, FALSE, 0);
    pathtf->buttonbox = buttonbox;
    
    for (int i=0;i<pathtf->current_nelm;i++) {
        UiPathElm *elm = &pathtf->current_pathelms[i];
        GtkWidget *button = ui_path_elm_button(pathtf, elm, i);
        gtk_box_pack_start(GTK_BOX(buttonbox), button, FALSE, FALSE, 0);
    }
    
    gtk_widget_show_all(buttonbox);
    
    return 0;
}

#endif

char* ui_path_textfield_get(UiString *str) {
    if(str->value.ptr) {
        str->value.free(str->value.ptr);
    }
    UiPathTextField *tf = str->obj;
    str->value.ptr = g_strdup(ENTRY_GET_TEXT(tf->entry));
    str->value.free = (ui_freefunc)g_free;
    return str->value.ptr;
}

void ui_path_textfield_set(UiString *str, const char *value) {
    UiPathTextField *tf = str->obj;
    ENTRY_SET_TEXT(tf->entry, value);
    ui_pathtextfield_update(tf, value);
    if(str->value.ptr) {
        str->value.free(str->value.ptr);
        str->value.ptr = NULL;
        str->value.free = NULL;
    }
}