ui/gtk/list.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 "../common/context.h"
#include "../common/object.h"
#include "container.h"

#include <cx/array_list.h>
#include <cx/linked_list.h>

#include "list.h"
#include "icon.h"
#include "menu.h"
#include "dnd.h"


void* ui_strmodel_getvalue(void *elm, int column) {
    return column == 0 ? elm : NULL;
}

static void* model_getvalue(UiModel *model, UiList *list, void *elm, int row, int col, UiBool *freeResult) {
    if(model->getvalue2) {
        return model->getvalue2(list, elm, row, col, model->getvalue2data, freeResult);
    } else if(model->getvalue) {
        return model->getvalue(elm, col);
    }
    return NULL;
}

/*
static GtkTargetEntry targetentries[] =
    {
      { "STRING",        0, 0 },
      { "text/plain",    0, 1 },
      { "text/uri-list", 0, 2 },
    };
*/

static void listview_copy_static_elements(UiListView *listview, char **elm, size_t nelm) {
    listview->elements = calloc(nelm, sizeof(char*));
    listview->nelm = nelm;
    for(int i=0;i<nelm;i++) {
        listview->elements[i] = strdup(elm[i]);
    }
}

#if GTK_CHECK_VERSION(4, 10, 0)


/* BEGIN GObject wrapper for generic pointers */

typedef struct _ObjWrapper {
    GObject parent_instance;
    void *data;
    int i;
} ObjWrapper;

typedef struct _ObjWrapperClass {
    GObjectClass parent_class;
} ObjWrapperClass;

G_DEFINE_TYPE(ObjWrapper, obj_wrapper, G_TYPE_OBJECT)

static void obj_wrapper_class_init(ObjWrapperClass *klass) {
    
}

static void obj_wrapper_init(ObjWrapper *self) {
    self->data = NULL;
}

ObjWrapper* obj_wrapper_new(void* data, int i) {
    ObjWrapper *obj = g_object_new(obj_wrapper_get_type(), NULL);
    obj->data = data;
    obj->i = i;
    return obj;
}

/* END GObject wrapper for generic pointers */

static void column_factory_setup(GtkListItemFactory *factory, GtkListItem *item, gpointer userdata) {
    UiColData *col = userdata;
    UiModel *model = col->listview->model;
    UiModelType type = model->types[col->model_column];
    if(type == UI_ICON_TEXT || type == UI_ICON_TEXT_FREE) {
        GtkWidget *hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6);
        GtkWidget *image = gtk_image_new();
        GtkWidget *label = gtk_label_new(NULL);
        BOX_ADD(hbox, image);
        BOX_ADD(hbox, label);
        gtk_list_item_set_child(item, hbox);
        g_object_set_data(G_OBJECT(hbox), "image", image);
        g_object_set_data(G_OBJECT(hbox), "label", label);
    } else if(type == UI_ICON) {
        GtkWidget *image = gtk_image_new();
        gtk_list_item_set_child(item, image);
    } else {
        GtkWidget *label = gtk_label_new(NULL);
        gtk_label_set_xalign(GTK_LABEL(label), 0);
        gtk_list_item_set_child(item, label);
    }
}

static void column_factory_bind( GtkListItemFactory *factory, GtkListItem *item, gpointer userdata) {
    UiColData *col = userdata;
    UiList *list = col->listview->var ? col->listview->var->value : NULL;
    
    ObjWrapper *obj = gtk_list_item_get_item(item);
    UiModel *model = col->listview->model;
    UiModelType type = model->types[col->model_column];
    
    UiBool freevalue = FALSE;
    void *data = model_getvalue(model, list, obj->data, obj->i, col->data_column, &freevalue);
    GtkWidget *child = gtk_list_item_get_child(item);
    
    switch(type) {
        case UI_STRING_FREE: {
            freevalue = TRUE;
        }
        case UI_STRING: {
            gtk_label_set_label(GTK_LABEL(child), data);
            if(freevalue) {
                free(data);
            }
            break;
        }
        case UI_INTEGER: {
            intptr_t intvalue = (intptr_t)data;
            char buf[32];
            snprintf(buf, 32, "%d", (int)intvalue);
            gtk_label_set_label(GTK_LABEL(child), buf);
            break;
        }
        case UI_ICON: {
            UiIcon *icon = data;
            if(icon) {
                gtk_image_set_from_paintable(GTK_IMAGE(child), GDK_PAINTABLE(icon->info));
            }
            break;
        }
        case UI_ICON_TEXT: {
            
        }
        case UI_ICON_TEXT_FREE: {
            void *data2 = model_getvalue(model, list, obj->data, obj->i, col->data_column+1, &freevalue);
            if(type == UI_ICON_TEXT_FREE) {
                freevalue = TRUE;
            }
            GtkWidget *image = g_object_get_data(G_OBJECT(child), "image");
            GtkWidget *label = g_object_get_data(G_OBJECT(child), "label");
            if(data && image) {
                UiIcon *icon = data;
                gtk_image_set_from_paintable(GTK_IMAGE(image), GDK_PAINTABLE(icon->info));
            }
            if(data2 && label) {
                gtk_label_set_label(GTK_LABEL(label), data2);
            }
            if(freevalue) {
                free(data2);
            }
            break;
        }
    }
}

static GtkSelectionModel* create_selection_model(UiListView *listview, GListStore *liststore, bool multiselection) {
    GtkSelectionModel *selection_model;
    if(multiselection) {
        selection_model = GTK_SELECTION_MODEL(gtk_multi_selection_new(G_LIST_MODEL(liststore)));
    } else {
        selection_model = GTK_SELECTION_MODEL(gtk_single_selection_new(G_LIST_MODEL(liststore)));
    }
    g_signal_connect(selection_model, "selection-changed", G_CALLBACK(ui_listview_selection_changed), listview);
    return selection_model;
}

static UiListView* create_listview(UiObject *obj, UiListArgs *args) {
    UiListView *tableview = malloc(sizeof(UiListView));
    memset(tableview, 0, sizeof(UiListView));
    tableview->obj = obj;
    tableview->model = args->model;
    tableview->onactivate = args->onactivate;
    tableview->onactivatedata = args->onactivatedata;
    tableview->onselection = args->onselection;
    tableview->onselectiondata = args->onselectiondata;
    tableview->ondragstart = args->ondragstart;
    tableview->ondragstartdata = args->ondragstartdata;
    tableview->ondragcomplete = args->ondragcomplete;
    tableview->ondragcompletedata = args->ondragcompletedata;
    tableview->ondrop = args->ondrop;
    tableview->ondropdata = args->ondropdata;
    tableview->selection.count = 0;
    tableview->selection.rows = NULL;
    return tableview;
}

UIWIDGET ui_listview_create(UiObject *obj, UiListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
    // to simplify things and share code with ui_table_create, we also
    // use a UiModel for the listview
    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
    if(args->getvalue2) {
        model->getvalue2 = args->getvalue2;
        model->getvalue2data = args->getvalue2data;
    } else if(args->getvalue) {
        model->getvalue = args->getvalue;
    } else {
        model->getvalue = ui_strmodel_getvalue;
    }
    args->model = model;
    
    GListStore *ls = g_list_store_new(G_TYPE_OBJECT);
    UiListView *listview = create_listview(obj, args);
    
    listview->columns = malloc(sizeof(UiColData));
    listview->columns->listview = listview;
    listview->columns->data_column = 0;
    listview->columns->model_column = 0;
    
    GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), listview->columns);
    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), listview->columns);
    
    GtkSelectionModel *selection_model = create_selection_model(listview, ls, args->multiselection);
    GtkWidget *view = gtk_list_view_new(GTK_SELECTION_MODEL(selection_model), factory);
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->list, args->varname, UI_VAR_LIST);
    
    // init listview
    listview->widget = view;
    listview->var = var;
    listview->liststore = ls;
    listview->selectionmodel = selection_model;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                listview);
    
    // bind listview to list
    if(var && var->value) {
        UiList *list = var->value;
        
        list->obj = listview;
        list->update = ui_listview_update2;
        list->getselection = ui_listview_getselection2;
        list->setselection = ui_listview_setselection2;
        
        ui_update_liststore(ls, list);
    } else if (args->static_elements && args->static_nelm > 0) {
        listview_copy_static_elements(listview, args->static_elements, args->static_nelm);
        listview->model->getvalue = ui_strmodel_getvalue; // force strmodel
        ui_update_liststore_static(ls, listview->elements, listview->nelm);
    }
    
    // event handling
    if(args->onactivate) {
        // columnview and listview can use the same callback function, because
        // the first parameter (which is technically a different pointer type)
        // is ignored
        g_signal_connect(view, "activate", G_CALLBACK(ui_columnview_activate), listview);
    }
    if(args->contextmenu) {
        UIMENU menu = ui_contextmenu_create(args->contextmenu, obj, view);
        ui_widget_set_contextmenu(view, menu);
    }
    
    // add widget to parent
    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, view);
    
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, scroll_area);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    current->container->current = view;
    
    return scroll_area;
}

UIWIDGET ui_combobox_create(UiObject *obj, UiListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
    // to simplify things and share code with ui_tableview_create, we also
    // use a UiModel for the listview
    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
    if(args->getvalue2) {
        model->getvalue2 = args->getvalue2;
        model->getvalue2data = args->getvalue2data;
    } else if(args->getvalue) {
        model->getvalue = args->getvalue;
    } else {
        model->getvalue = ui_strmodel_getvalue;
    }
    args->model = model;
    
    GListStore *ls = g_list_store_new(G_TYPE_OBJECT);
    UiListView *listview = create_listview(obj, args);
    
    listview->columns = malloc(sizeof(UiColData));
    listview->columns->listview = listview;
    listview->columns->data_column = 0;
    listview->columns->model_column = 0;
    
    GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
    g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), listview->columns);
    g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), listview->columns);
    
    GtkWidget *view = gtk_drop_down_new(G_LIST_MODEL(ls), NULL);
    gtk_drop_down_set_factory(GTK_DROP_DOWN(view), factory);
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->list, args->varname, UI_VAR_LIST);
    
    // init listview
    listview->widget = view;
    listview->var = var;
    listview->liststore = ls;
    listview->selectionmodel = NULL;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                listview);
    
    // bind listview to list
    if(var && var->value) {
        UiList *list = var->value;
        
        list->obj = listview;
        list->update = ui_listview_update2;
        list->getselection = ui_combobox_getselection;
        list->setselection = ui_combobox_setselection;
        
        ui_update_liststore(ls, list);
    } else if (args->static_elements && args->static_nelm > 0) {
        listview_copy_static_elements(listview, args->static_elements, args->static_nelm);
        listview->model->getvalue = ui_strmodel_getvalue; // force strmodel
        ui_update_liststore_static(ls, listview->elements, listview->nelm);
    }
    
    // event handling
    if(args->onactivate) {
        g_signal_connect(view, "notify::selected", G_CALLBACK(ui_dropdown_notify), listview);
    }
    
    // add widget to parent 
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, view);
    return view;
}

void ui_listview_select(UIWIDGET listview, int index) {
    GtkSelectionModel *model = gtk_list_view_get_model(GTK_LIST_VIEW(listview));
    gtk_selection_model_select_item(model, index, TRUE);
}
    
void ui_combobox_select(UIWIDGET dropdown, int index) {
    gtk_drop_down_set_selected(GTK_DROP_DOWN(dropdown), index);
}

UIWIDGET ui_table_create(UiObject *obj, UiListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
    GListStore *ls = g_list_store_new(G_TYPE_OBJECT);
    //g_list_store_append(ls, v1);
    
    // create obj to store all relevant data we need for handling events
    // and list updates
    UiListView *tableview = create_listview(obj, args);
    
    GtkSelectionModel *selection_model = create_selection_model(tableview, ls, args->multiselection);
    GtkWidget *view = gtk_column_view_new(GTK_SELECTION_MODEL(selection_model));
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->list, args->varname, UI_VAR_LIST);
    
    // init tableview
    tableview->widget = view;
    tableview->var = var;
    tableview->liststore = ls;
    tableview->selectionmodel = selection_model;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                tableview);
    
    
    // create columns from UiModel
    UiModel *model = args->model;
    int columns = model ? model->columns : 0;
    
    tableview->columns = calloc(columns, sizeof(UiColData));
    
    int addi = 0;
    for(int i=0;i<columns;i++) {
        tableview->columns[i].listview = tableview;
        tableview->columns[i].model_column = i;
        tableview->columns[i].data_column = i+addi;
        
        if(model->types[i] == UI_ICON_TEXT || model->types[i] == UI_ICON_TEXT_FREE) {
            // icon+text has 2 data columns
            addi++;
        }
        
        GtkListItemFactory *factory = gtk_signal_list_item_factory_new();
        UiColData *col = &tableview->columns[i]; 
        g_signal_connect(factory, "setup", G_CALLBACK(column_factory_setup), col);
	g_signal_connect(factory, "bind", G_CALLBACK(column_factory_bind), col);
        
        GtkColumnViewColumn *column = gtk_column_view_column_new(model->titles[i], factory);
        gtk_column_view_column_set_resizable(column, true);
        gtk_column_view_append_column(GTK_COLUMN_VIEW(view), column);
        
        int size = model->columnsize[i];
        if(size > 0) {
            gtk_column_view_column_set_fixed_width(column, size);
        } else if(size < 0) {
            gtk_column_view_column_set_expand(column, TRUE);
        }
    }
    
    // bind listview to list
    if(var && var->value) {
        UiList *list = var->value;
        
        list->obj = tableview;
        list->update = ui_listview_update2;
        list->getselection = ui_listview_getselection2;
        list->setselection = ui_listview_setselection2;
        
        ui_update_liststore(ls, list);
    }
    
    // event handling
    if(args->onactivate) {
        g_signal_connect(view, "activate", G_CALLBACK(ui_columnview_activate), tableview);
    }
    if(args->contextmenu) {
        UIMENU menu = ui_contextmenu_create(args->contextmenu, obj, view);
        ui_widget_set_contextmenu(view, menu);
    }
    
    // add widget to parent
    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, view);
    
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, scroll_area);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    current->container->current = view;
    
    return scroll_area;
}

static UiListSelection selectionmodel_get_selection(GtkSelectionModel *model) {
    UiListSelection sel = { 0, NULL };
    GtkBitset *bitset = gtk_selection_model_get_selection(model);
    int n = gtk_bitset_get_size(bitset);
    printf("bitset %d\n", n);
    
    gtk_bitset_unref(bitset);
    return sel;
}

static void listview_event(ui_callback cb, void *cbdata, UiListView *view) {
    UiEvent event;
    event.obj = view->obj;
    event.document = event.obj->ctx->document;
    event.window = event.obj->window;
    event.intval = view->selection.count;
    event.eventdata = &view->selection;
    event.eventdatatype = UI_EVENT_DATA_LIST_SELECTION;
    event.set = ui_get_setop();
    if(cb) {
        cb(&event, cbdata);
    }
}

static void listview_update_selection(UiListView *view) {
    free(view->selection.rows);
    view->selection.count = 0;
    view->selection.rows = NULL;
    
    CX_ARRAY_DECLARE(int, newselection);
    cx_array_initialize(newselection, 8);
     
    size_t nitems = g_list_model_get_n_items(G_LIST_MODEL(view->liststore));
    
    for(size_t i=0;i<nitems;i++) {
        if(gtk_selection_model_is_selected(view->selectionmodel, i)) {
            int s = (int)i;
            cx_array_simple_add(newselection, s);
        }
    }
    
    if(newselection_size > 0) {
        view->selection.count = newselection_size;
        view->selection.rows = newselection;
    } else {
        free(newselection);
    }
}

void ui_dropdown_notify(GtkWidget *dropdown, GObject *pspec, gpointer userdata) {
    UiListView *view = userdata;
    guint index = gtk_drop_down_get_selected(GTK_DROP_DOWN(dropdown));
    GObject *item = gtk_drop_down_get_selected_item(GTK_DROP_DOWN(dropdown));
    if(item && view->onactivate) {
        ObjWrapper *eventdata = (ObjWrapper*)item;
        UiEvent event;
        event.obj = view->obj;
        event.document = event.obj->ctx->document;
        event.window = event.obj->window;
        event.intval = index;
        event.eventdata = eventdata->data;
        event.eventdatatype = UI_EVENT_DATA_LIST_ELM;
        event.set = ui_get_setop();
        view->onactivate(&event, view->onactivatedata);
    }
}
    
    
void ui_columnview_activate(void *ignore, guint position, gpointer userdata) {
    UiListView *view = userdata;
    if(view->selection.count == 0) {
        listview_update_selection(view);
    }
    listview_event(view->onactivate, view->onactivatedata, view);
}

void ui_listview_selection_changed(GtkSelectionModel* self, guint position, guint n_items, gpointer userdata) {
    UiListView *view = userdata;
    listview_update_selection(view);
    listview_event(view->onselection, view->onselectiondata, view);
}

void ui_dropdown_activate(GtkDropDown* self, gpointer userdata) {
    UiListView *view = userdata;
    guint selection = gtk_drop_down_get_selected(GTK_DROP_DOWN(view->widget));
    UiListSelection sel = { 0, NULL };
    int sel2 = (int)selection;
    if(selection != GTK_INVALID_LIST_POSITION) {
        sel.count = 1;
        sel.rows = &sel2;
    }
    
    if(view->onactivate) {
        UiEvent event;
        event.obj = view->obj;
        event.document = event.obj->ctx->document;
        event.window = event.obj->window;
        event.intval = view->selection.count;
        event.eventdata = &view->selection;
        event.eventdatatype = UI_EVENT_DATA_LIST_SELECTION;
        event.set = ui_get_setop();
        view->onactivate(&event, view->onactivatedata);
    }
}

void ui_update_liststore(GListStore *liststore, UiList *list) {
    g_list_store_remove_all(liststore);
    int i = 0;
    void *elm = list->first(list);
    while(elm) {
        ObjWrapper *obj = obj_wrapper_new(elm, i++);
        g_list_store_append(liststore, obj);
        elm = list->next(list);
    }
}

void ui_update_liststore_static(GListStore *liststore, char **elm, size_t nelm) {
    g_list_store_remove_all(liststore);
    for(int i=0;i<nelm;i++) {
        ObjWrapper *obj = obj_wrapper_new(elm[i], i);
        g_list_store_append(liststore, obj);
    }
}

void ui_listview_update2(UiList *list, int i) {
    UiListView *view = list->obj;
    if(i < 0) {
        ui_update_liststore(view->liststore, list);
    } else {
        void *value = list->get(list, i);
        if(value) {
            ObjWrapper *obj = obj_wrapper_new(value, i);
            // TODO: if index i is selected, the selection is lost
            // is it possible to update the item without removing it?
            int count = g_list_model_get_n_items(G_LIST_MODEL(view->liststore));
            if(count <= i) {
                g_list_store_splice(view->liststore, i, 0, (void **)&obj, 1);
            } else {
                g_list_store_splice(view->liststore, i, 1, (void **)&obj, 1);
            }
        }
    }
}

UiListSelection ui_listview_getselection2(UiList *list) {
    UiListView *view = list->obj;
    UiListSelection selection;
    selection.count = view->selection.count;
    selection.rows = calloc(selection.count, sizeof(int));
    memcpy(selection.rows, view->selection.rows, selection.count*sizeof(int));
    return selection;
}

void ui_listview_setselection2(UiList *list, UiListSelection selection) {
    ui_setop_enable(TRUE);
    UiListView *view = list->obj;
    UiListSelection newselection;
    newselection.count = view->selection.count;
    if(selection.count > 0) {
        newselection.rows = calloc(newselection.count, sizeof(int));
        memcpy(newselection.rows, selection.rows, selection.count*sizeof(int));
    } else {
        newselection.rows = NULL;
    }
    free(view->selection.rows);
    view->selection = newselection;
    
    gtk_selection_model_unselect_all(view->selectionmodel);
    if(selection.count > 0) {
        for(int i=0;i<selection.count;i++) {
            gtk_selection_model_select_item(view->selectionmodel, selection.rows[i], FALSE);
        }
    }
    ui_setop_enable(FALSE);
}

UiListSelection ui_combobox_getselection(UiList *list) {
    UiListView *view = list->obj;
    guint selection = gtk_drop_down_get_selected(GTK_DROP_DOWN(view->widget));
    UiListSelection sel = { 0, NULL };
    if(selection != GTK_INVALID_LIST_POSITION) {
        sel.count = 1;
        sel.rows = malloc(sizeof(int));
        sel.rows[0] = (int)selection;
    }
    return sel;
}

void ui_combobox_setselection(UiList *list, UiListSelection selection) {
    ui_setop_enable(TRUE);
    UiListView *view = list->obj;
    if(selection.count > 0) {
        gtk_drop_down_set_selected(GTK_DROP_DOWN(view->widget), selection.rows[0]);
    } else {
        gtk_drop_down_set_selected(GTK_DROP_DOWN(view->widget), GTK_INVALID_LIST_POSITION);
    }
    ui_setop_enable(FALSE);
}

#else

static void update_list_row(GtkListStore *store, GtkTreeIter *iter, UiModel *model, UiList *list, void *elm, int row) {
    // set column values
    int c = 0;
    for(int i=0;i<model->columns;i++,c++) {
        UiBool freevalue = FALSE;
        void *data = model_getvalue(model, list, elm, row, c, &freevalue);

        GValue value = G_VALUE_INIT;
        switch(model->types[i]) {
            case UI_STRING_FREE: {
                freevalue = TRUE;
            } 
            case UI_STRING: {
                g_value_init(&value, G_TYPE_STRING);
                g_value_set_string(&value, data);
                if(freevalue) {
                    free(data);
                }
                break;
            }
            case UI_INTEGER: {
                g_value_init(&value, G_TYPE_INT);
                intptr_t intptr = (intptr_t)data;
                g_value_set_int(&value, (int)intptr);
                break;
            }
            case UI_ICON: {
                g_value_init(&value, G_TYPE_OBJECT);
                UiIcon *icon = data;
#if GTK_MAJOR_VERSION >= 4
                g_value_set_object(&value, icon->info); // TODO: does this work?
#else
                if(!icon->pixbuf && icon->info) {
                    GError *error = NULL;
                    GdkPixbuf *pixbuf = gtk_icon_info_load_icon(icon->info, &error);
                    icon->pixbuf = pixbuf;
                }

                if(icon->pixbuf) {
                    g_value_set_object(&value, icon->pixbuf);
                }
#endif
                break;
            }
            case UI_ICON_TEXT:
            case UI_ICON_TEXT_FREE: {
                UiIcon *icon = data;
#if GTK_MAJOR_VERSION >= 4
                if(icon) {
                    GValue iconvalue = G_VALUE_INIT;
                    g_value_init(&iconvalue, G_TYPE_OBJECT);
                    g_value_set_object(&iconvalue, ui_icon_pixbuf(icon));
                    gtk_list_store_set_value(store, &iter, c, &iconvalue);
                }
#else
                GValue pixbufvalue = G_VALUE_INIT;
                if(icon) {
                    if(!icon->pixbuf && icon->info) {
                        GError *error = NULL;
                        GdkPixbuf *pixbuf = gtk_icon_info_load_icon(icon->info, &error);
                        icon->pixbuf = pixbuf;
                    }
                    g_value_init(&pixbufvalue, G_TYPE_OBJECT);
                    g_value_set_object(&pixbufvalue, icon->pixbuf);
                    gtk_list_store_set_value(store, iter, c, &pixbufvalue);
                }
#endif
                c++;
                
                freevalue = FALSE;
                char *str = model_getvalue(model, list, elm, row, c, &freevalue);
                g_value_init(&value, G_TYPE_STRING);
                g_value_set_string(&value, str);
                if(model->types[i] == UI_ICON_TEXT_FREE || freevalue) {
                    free(str);
                }
                break;
            }
        }

        gtk_list_store_set_value(store, iter, c, &value);
    }
}

static GtkListStore* create_list_store(UiList *list, UiModel *model) {
    int columns = model->columns;
    GType types[2*columns];
    int c = 0;
    for(int i=0;i<columns;i++,c++) {
        switch(model->types[i]) {
            case UI_STRING: 
            case UI_STRING_FREE: types[c] = G_TYPE_STRING; break;
            case UI_INTEGER: types[c] = G_TYPE_INT; break;
            case UI_ICON: types[c] = G_TYPE_OBJECT; break;
            case UI_ICON_TEXT: 
            case UI_ICON_TEXT_FREE: {
                types[c] = G_TYPE_OBJECT;
                types[++c] = G_TYPE_STRING;
            }
        }
    }
    
    GtkListStore *store = gtk_list_store_newv(c, types);
    
    if(list) {
        void *elm = list->first(list);
        int i = 0;
	while(elm) {
            // insert new row
            GtkTreeIter iter;
            gtk_list_store_insert (store, &iter, -1);
            
            update_list_row(store, &iter, model, list, elm, i++);
            
            // next row
            elm = list->next(list);
        }
    }
    
    return store;
}


UIWIDGET ui_listview_create(UiObject *obj, UiListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
    // create treeview
    GtkWidget *view = gtk_tree_view_new();
    ui_set_name_and_style(view, args->name, args->style_class);
    ui_set_widget_groups(obj->ctx, view, args->groups);
    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
    GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(NULL, renderer, "text", 0, NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
    
    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
#ifdef UI_GTK3
#if GTK_MINOR_VERSION >= 8
    //gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
#else
    // TODO: implement for older gtk3
#endif
#else
    // TODO: implement for gtk2
#endif
    
    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
    if(args->getvalue2) {
        model->getvalue2 = args->getvalue2;
        model->getvalue2data = args->getvalue2data;
    } else if(args->getvalue) {
        model->getvalue = args->getvalue;
    } else {
        model->getvalue = ui_strmodel_getvalue;
    }
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->list, args->varname, UI_VAR_LIST);
    
    UiList *list = var ? var->value : NULL;
    GtkListStore *listmodel = create_list_store(list, model);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(listmodel));
    g_object_unref(listmodel);
    
    UiListView *listview = malloc(sizeof(UiListView));
    memset(listview, 0, sizeof(UiListView));
    listview->obj = obj;
    listview->widget = view;
    listview->var = var;
    listview->model = model;
    listview->selection.count = 0;
    listview->selection.rows = NULL;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                listview);
    
    // bind var
    list->update = ui_listview_update;
    list->getselection = ui_listview_getselection;
    list->setselection = ui_listview_setselection;
    list->obj = listview;
    
    // add callback
    UiTreeEventData *event = malloc(sizeof(UiTreeEventData));
    event->obj = obj;
    event->activate = args->onactivate;
    event->activatedata = args->onactivatedata;
    event->selection = args->onselection;
    event->selectiondata = args->onselectiondata;
    g_signal_connect(
            view,
            "destroy",
            G_CALLBACK(ui_destroy_userdata),
            event);
    
    if(args->onactivate) {
        g_signal_connect(
                view,
                "row-activated",
                G_CALLBACK(ui_listview_activate_event),
                event);
    }
    if(args->onselection) {
        GtkTreeSelection *selection = gtk_tree_view_get_selection(
                GTK_TREE_VIEW(view));
        g_signal_connect(
                selection,
                "changed",
                G_CALLBACK(ui_listview_selection_event),
                event);
    }
    if(args->contextmenu) {
        UIMENU menu = ui_contextmenu_create(args->contextmenu, obj, view);
        ui_widget_set_contextmenu(view, menu);
    }
    
    
    // add widget to the current container
    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, view);
    
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, scroll_area, FALSE);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    current->container->current = view;
    
    return scroll_area;
}

void ui_listview_select(UIWIDGET listview, int index) {
    GtkTreeSelection *sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(listview));
    GtkTreePath *path = gtk_tree_path_new_from_indicesv(&index, 1);
    gtk_tree_selection_select_path(sel, path);
    //g_object_unref(path);
}
    
void ui_combobox_select(UIWIDGET dropdown, int index) {
    gtk_combo_box_set_active(GTK_COMBO_BOX(dropdown), index);
}

UIWIDGET ui_table_create(UiObject *obj, UiListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
    // create treeview
    GtkWidget *view = gtk_tree_view_new();
    
    UiModel *model = args->model;
    int columns = model ? model->columns : 0;
    
    int addi = 0;
    for(int i=0;i<columns;i++) {
        GtkTreeViewColumn *column = NULL;
        if(model->types[i] == UI_ICON_TEXT) {
            column = gtk_tree_view_column_new();
            gtk_tree_view_column_set_title(column, model->titles[i]);
            
            GtkCellRenderer *iconrenderer = gtk_cell_renderer_pixbuf_new();
            GtkCellRenderer *textrenderer = gtk_cell_renderer_text_new();
            
            gtk_tree_view_column_pack_end(column, textrenderer, TRUE);
            gtk_tree_view_column_pack_start(column, iconrenderer, FALSE);
            
            
            gtk_tree_view_column_add_attribute(column, iconrenderer, "pixbuf", i);
            gtk_tree_view_column_add_attribute(column, textrenderer, "text", i+1);
            
            addi++;
        } else if (model->types[i] == UI_ICON) {
            GtkCellRenderer *iconrenderer = gtk_cell_renderer_pixbuf_new();
            column = gtk_tree_view_column_new_with_attributes(
                model->titles[i],
                iconrenderer,
                "pixbuf",
                i + addi,
                NULL);
        } else {
            GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
            column = gtk_tree_view_column_new_with_attributes(
                model->titles[i],
                renderer,
                "text",
                i + addi,
                NULL);
        }
        
        int colsz = model->columnsize[i];
        if(colsz > 0) {
            gtk_tree_view_column_set_fixed_width(column, colsz);
        } else if(colsz < 0) {
            gtk_tree_view_column_set_expand(column, TRUE);
        }
        
        gtk_tree_view_column_set_resizable(column, TRUE);
        gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
    }
    
    //gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
#ifdef UI_GTK3
    //gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
#else
    
#endif
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->list, args->varname, UI_VAR_LIST);
    
    UiList *list = var ? var->value : NULL;
    GtkListStore *listmodel = create_list_store(list, model);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(listmodel));
    g_object_unref(listmodel);
    
    //g_signal_connect(view, "drag-begin", G_CALLBACK(drag_begin), NULL);
    //g_signal_connect(view, "drag-end", G_CALLBACK(drag_end), NULL);
       
    // add TreeView as observer to the UiList to update the TreeView if the
    // data changes
    UiListView *tableview = malloc(sizeof(UiListView));
    memset(tableview, 0, sizeof(UiListView));
    tableview->obj = obj;
    tableview->widget = view;
    tableview->var = var;
    tableview->model = model;
    tableview->ondragstart = args->ondragstart;
    tableview->ondragstartdata = args->ondragstartdata;
    tableview->ondragcomplete = args->ondragcomplete;
    tableview->ondragcompletedata = args->ondragcompletedata;
    tableview->ondrop = args->ondrop;
    tableview->ondropdata = args->ondropdata;
    tableview->selection.count = 0;
    tableview->selection.rows = NULL;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                tableview);
    
    // bind var
    list->update = ui_listview_update;
    list->getselection = ui_listview_getselection;
    list->setselection = ui_listview_setselection;
    list->obj = tableview;
    
    // add callback
    UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
    event->obj = obj;
    event->activate = args->onactivate;
    event->selection = args->onselection;
    event->activatedata = args->onactivatedata;
    event->selectiondata = args->onselectiondata;
    if(args->onactivate) {
        g_signal_connect(
                view,
                "row-activated",
                G_CALLBACK(ui_listview_activate_event),
                event);
    }
    if(args->onselection) {
        GtkTreeSelection *selection = gtk_tree_view_get_selection(
                GTK_TREE_VIEW(view));
        g_signal_connect(
                selection,
                "changed",
                G_CALLBACK(ui_listview_selection_event),
                event);
    }
    // TODO: destroy callback
    
    
    if(args->ondragstart) {
        ui_listview_add_dnd(tableview, args);
    }
    if(args->ondrop) {
        ui_listview_enable_drop(tableview, args);
    }
      
    GtkTreeSelection *selection = gtk_tree_view_get_selection (GTK_TREE_VIEW(view));
    if(args->multiselection) {
        gtk_tree_selection_set_mode(selection, GTK_SELECTION_MULTIPLE);
    }
    
    // add widget to the current container
    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, view);
    
    if(args->contextmenu) {
        UIMENU menu = ui_contextmenu_create(args->contextmenu, obj, scroll_area);
#if GTK_MAJOR_VERSION >= 4
        ui_widget_set_contextmenu(scroll_area, menu);
#else
        ui_widget_set_contextmenu(view, menu);
#endif
    }
    
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, scroll_area, FALSE);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    current->container->current = view;
    
    return scroll_area;
}


void ui_listview_update(UiList *list, int i) {
    UiListView *view = list->obj;
    if(i < 0) {
        GtkListStore *store = create_list_store(list, view->model);
        gtk_tree_view_set_model(GTK_TREE_VIEW(view->widget), GTK_TREE_MODEL(store));
        g_object_unref(G_OBJECT(store));
    } else {
        void *elm = list->get(list, i);
        GtkTreeModel *store = gtk_tree_view_get_model(GTK_TREE_VIEW(view->widget));
        GtkTreeIter iter;
        if(gtk_tree_model_iter_nth_child(store, &iter, NULL, i)) {
            update_list_row(GTK_LIST_STORE(store), &iter, view->model, list, elm, i);
        }
    }
}

UiListSelection ui_listview_getselection(UiList *list) {
    UiListView *view = list->obj;
    UiListSelection selection = ui_listview_selection(
            gtk_tree_view_get_selection(GTK_TREE_VIEW(view->widget)),
            NULL);
    return selection;
}

void ui_listview_setselection(UiList *list, UiListSelection selection) {
    ui_setop_enable(TRUE);
    UiListView *view = list->obj;
    GtkTreeSelection *sel = gtk_tree_view_get_selection(GTK_TREE_VIEW(view->widget));
    GtkTreePath *path = gtk_tree_path_new_from_indicesv(selection.rows, selection.count);
    gtk_tree_selection_select_path(sel, path);
    //g_object_unref(path);
    ui_setop_enable(FALSE);
}


/* --------------------------- ComboBox ---------------------------  */

UIWIDGET ui_combobox_create(UiObject *obj, UiListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
    if(args->getvalue2) {
        model->getvalue2 = args->getvalue2;
        model->getvalue2data = args->getvalue2data;
    } else if(args->getvalue) {
        model->getvalue = args->getvalue;
    } else {
        model->getvalue = ui_strmodel_getvalue;
    }
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->list, args->varname, UI_VAR_LIST);
    
    GtkWidget *combobox = ui_create_combobox(obj, model, var, args->static_elements, args->static_nelm, args->onactivate, args->onactivatedata);
    ui_set_name_and_style(combobox, args->name, args->style_class);
    ui_set_widget_groups(obj->ctx, combobox, args->groups);
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, combobox, FALSE);
    current->container->current = combobox;
    return combobox;
}

GtkWidget* ui_create_combobox(UiObject *obj, UiModel *model, UiVar *var, char **elm, size_t nelm, ui_callback f, void *udata) {
    GtkWidget *combobox = gtk_combo_box_new();
       
    UiListView *uicbox = malloc(sizeof(UiListView));
    memset(uicbox, 0, sizeof(UiListView));
    uicbox->obj = obj;
    uicbox->widget = combobox;
    
    UiList *list = var ? var->value : NULL;
    GtkListStore *listmodel = create_list_store(list, model);
    
    if(!list && elm && nelm > 0) {
        listview_copy_static_elements(uicbox, elm, nelm);
        for(int i=0;i<nelm;i++) {
            GtkTreeIter iter;
            GValue value = G_VALUE_INIT;
            gtk_list_store_insert(listmodel, &iter, -1);
            g_value_init(&value, G_TYPE_STRING);
            g_value_set_string(&value, uicbox->elements[i]);
            gtk_list_store_set_value(listmodel, &iter, 0, &value);
        }
    }
    
    if(listmodel) {
        gtk_combo_box_set_model(GTK_COMBO_BOX(combobox), GTK_TREE_MODEL(listmodel));
        g_object_unref(listmodel);
    }
    
    uicbox->var = var;
    uicbox->model = model;
    
    g_signal_connect(
                combobox,
                "destroy",
                G_CALLBACK(ui_combobox_destroy),
                uicbox);
    
    // bind var
    if(list) {
        list->update = ui_combobox_modelupdate;
        list->getselection = ui_combobox_getselection;
        list->setselection = ui_combobox_setselection;
        list->obj = uicbox;
    }
    
    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
    gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combobox), renderer, TRUE);
    gtk_cell_layout_set_attributes(
            GTK_CELL_LAYOUT(combobox),
            renderer,
            "text",
            0,
            NULL);
    gtk_combo_box_set_active(GTK_COMBO_BOX(combobox), 0);
    
    // add callback
    if(f) {
        UiEventData *event = ui_malloc(obj->ctx, sizeof(UiEventData));
        event->obj = obj;
        event->userdata = udata;
        event->callback = f;
        event->value = 0;
        event->customdata = uicbox;

        g_signal_connect(
                combobox,
                "changed",
                G_CALLBACK(ui_combobox_change_event),
                event);
    }
    
    return combobox;
}

void ui_combobox_change_event(GtkComboBox *widget, UiEventData *e) {
    int index = gtk_combo_box_get_active(widget);
    UiListView *listview = e->customdata;
    void *eventdata = NULL;
    if(listview->var && listview->var->value) {
        UiList *list = listview->var->value;
        eventdata = ui_list_get(list, index);
    } else if(listview->elements && listview->nelm > index) {
        eventdata = listview->elements[index];
    } 
    
    UiEvent event;
    event.obj = e->obj;
    event.window = event.obj->window;
    event.document = event.obj->ctx->document;
    event.eventdata = eventdata;
    event.intval = index;
    event.set = ui_get_setop();
    e->callback(&event, e->userdata);
}

void ui_combobox_modelupdate(UiList *list, int i) {
    UiListView *view = list->obj;
    GtkListStore *store = create_list_store(view->var->value, view->model);
    gtk_combo_box_set_model(GTK_COMBO_BOX(view->widget), GTK_TREE_MODEL(store));
    g_object_unref(store);
}

UiListSelection ui_combobox_getselection(UiList *list) {
    UiListView *combobox = list->obj;
    UiListSelection ret;
    ret.rows = malloc(sizeof(int*));
    ret.count = 1;
    ret.rows[0] = gtk_combo_box_get_active(GTK_COMBO_BOX(combobox->widget));
    return ret;
}

void ui_combobox_setselection(UiList *list, UiListSelection selection) {
    ui_setop_enable(TRUE);
    UiListView *combobox = list->obj;
    if(selection.count > 0) {
        gtk_combo_box_set_active(GTK_COMBO_BOX(combobox->widget), selection.rows[0]);
    }
    ui_setop_enable(FALSE);
}


void ui_listview_activate_event(
        GtkTreeView *treeview,
        GtkTreePath *path,
        GtkTreeViewColumn *column,
        UiTreeEventData *event)
{
    UiListSelection selection = ui_listview_selection(
            gtk_tree_view_get_selection(treeview),
            event);
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = &selection;
    e.intval = selection.count > 0 ? selection.rows[0] : -1;
    e.set = ui_get_setop();
    event->activate(&e, event->activatedata);
    
    if(selection.count > 0) {
        free(selection.rows);
    }
}

void ui_listview_selection_event(
        GtkTreeSelection *treeselection,
        UiTreeEventData *event)
{
    UiListSelection selection = ui_listview_selection(treeselection, event);
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = &selection;
    e.intval = selection.count > 0 ? selection.rows[0] : -1;
    e.set = ui_get_setop();
    event->selection(&e, event->selectiondata);
    
    if(selection.count > 0) {
        free(selection.rows);
    }
}

UiListSelection ui_listview_selection(
        GtkTreeSelection *selection,
        UiTreeEventData *event)
{
    GList *rows = gtk_tree_selection_get_selected_rows(selection, NULL);
    
    UiListSelection ls;
    ls.count = g_list_length(rows);
    ls.rows = calloc(ls.count, sizeof(int));
    GList *r = rows;
    int i = 0;
    while(r) {
        GtkTreePath *path = r->data;
        ls.rows[i] = ui_tree_path_list_index(path);
        r = r->next;
        i++;
    }
    return ls;
}

int ui_tree_path_list_index(GtkTreePath *path) {
    int depth = gtk_tree_path_get_depth(path);
    if(depth == 0) {
        fprintf(stderr, "UiError: treeview selection: depth == 0\n");
        return -1;
    }
    int *indices = gtk_tree_path_get_indices(path);
    return indices[depth - 1];
}


#endif


#if GTK_MAJOR_VERSION >= 4

static GdkContentProvider *ui_listview_dnd_prepare(GtkDragSource *source, double x, double y, void *data) {
    //printf("drag prepare\n");
    UiListView *listview = data;
    
    UiDnD *dnd = ui_create_dnd();
    GdkContentProvider *provider = NULL;
    
    
    if(listview->ondragstart) {
        UiEvent event;
        event.obj = listview->obj;
        event.window = event.obj->window;
        event.document = event.obj->ctx->document;
        event.eventdata = dnd;
        event.eventdatatype = UI_EVENT_DATA_DND;
        event.intval = 0;
        event.set = ui_get_setop();
        listview->ondragstart(&event, listview->ondragstartdata);
    }
    
    size_t numproviders = cxListSize(dnd->providers);
    if(numproviders > 0) {
        GdkContentProvider **providers = (GdkContentProvider**)cxListAt(dnd->providers, 0);
        provider = gdk_content_provider_new_union(providers, numproviders);
    }
    ui_dnd_free(dnd);
    
    return provider;
}

static void ui_listview_drag_begin(GtkDragSource *self, GdkDrag *drag, gpointer userdata) {
    //printf("drag begin\n");
}

static void ui_listview_drag_end(GtkDragSource *self, GdkDrag *drag, gboolean delete_data, gpointer user_data) {
    //printf("drag end\n");
    UiListView *listview = user_data;
    if(listview->ondragcomplete) {
        UiDnD dnd;
        dnd.target = NULL;
        dnd.value = NULL;
        dnd.providers = NULL;
        dnd.selected_action = gdk_drag_get_selected_action(drag);
        dnd.delete = delete_data;
        dnd.accept = FALSE;
        
        UiEvent event;
        event.obj = listview->obj;
        event.window = event.obj->window;
        event.document = event.obj->ctx->document;
        event.eventdata = &dnd;
        event.eventdatatype = UI_EVENT_DATA_DND;
        event.intval = 0;
        event.set = ui_get_setop();
        listview->ondragcomplete(&event, listview->ondragcompletedata);
    }
}

static gboolean ui_listview_drop(
        GtkDropTarget *target,
        const GValue* value,
        gdouble x,
        gdouble y,
        gpointer user_data)
{
    UiListView *listview = user_data;
    UiDnD dnd;
    dnd.providers = NULL;
    dnd.target = target;
    dnd.value = value;
    dnd.selected_action = 0;
    dnd.delete = FALSE;
    dnd.accept = FALSE;
    
    if(listview->ondrop) {
        dnd.accept = TRUE;
        UiEvent event;
        event.obj = listview->obj;
        event.window = event.obj->window;
        event.document = event.obj->ctx->document;
        event.eventdata = &dnd;
        event.eventdatatype = UI_EVENT_DATA_DND;
        event.intval = 0;
        event.set = ui_get_setop();
        listview->ondrop(&event, listview->ondropdata);
    }
    
    return dnd.accept;
}

void ui_listview_add_dnd(UiListView *listview, UiListArgs *args) {
    GtkDragSource *dragsource = gtk_drag_source_new();
    gtk_widget_add_controller(listview->widget, GTK_EVENT_CONTROLLER(dragsource));
    g_signal_connect (dragsource, "prepare", G_CALLBACK (ui_listview_dnd_prepare), listview);
    g_signal_connect(
            dragsource,
            "drag-begin",
            G_CALLBACK(ui_listview_drag_begin),
            listview);
    g_signal_connect(
            dragsource,
            "drag-end",
            G_CALLBACK(ui_listview_drag_end),
            listview);
}

void ui_listview_enable_drop(UiListView *listview, UiListArgs *args) {
    GtkDropTarget *target = gtk_drop_target_new(G_TYPE_INVALID, GDK_ACTION_COPY);
    gtk_widget_add_controller(listview->widget, GTK_EVENT_CONTROLLER(target));
    GType default_types[2] = { GDK_TYPE_FILE_LIST, G_TYPE_STRING };
    gtk_drop_target_set_gtypes(target, default_types, 2);
    g_signal_connect(target, "drop", G_CALLBACK(ui_listview_drop), listview);
}

#else

static GtkTargetEntry targetentries[] =
{
    { "STRING",        0, 0 },
    { "text/plain",    0, 1 },
    { "text/uri-list", 0, 2 },
};

static void ui_listview_drag_getdata(
        GtkWidget* self,
        GdkDragContext* context,
        GtkSelectionData* data,
        guint info,
        guint time,
        gpointer user_data)
{
    UiListView *listview = user_data;
    UiDnD dnd;
    dnd.context = context;
    dnd.data = data;
    dnd.selected_action = 0;
    dnd.delete = FALSE;
    dnd.accept = FALSE;
    
    if(listview->ondragstart) {
        UiEvent event;
        event.obj = listview->obj;
        event.window = event.obj->window;
        event.document = event.obj->ctx->document;
        event.eventdata = &dnd;
        event.intval = 0;
        event.set = ui_get_setop();
        listview->ondragstart(&event, listview->ondragstartdata);
    }
}

static void ui_listview_drag_end(
        GtkWidget *widget,
        GdkDragContext *context,
        guint time,
        gpointer user_data)
{
    UiListView *listview = user_data;
    UiDnD dnd;
    dnd.context = context;
    dnd.data = NULL;
    dnd.selected_action = gdk_drag_context_get_selected_action(context);
    dnd.delete = dnd.selected_action == UI_DND_ACTION_MOVE ? TRUE : FALSE;
    dnd.accept = FALSE;
    if(listview->ondragcomplete) {
        UiEvent event;
        event.obj = listview->obj;
        event.window = event.obj->window;
        event.document = event.obj->ctx->document;
        event.eventdata = &dnd;
        event.intval = 0;
        event.set = ui_get_setop();
        listview->ondragcomplete(&event, listview->ondragcompletedata);
    }
}

void ui_listview_add_dnd(UiListView *listview, UiListArgs *args) {
    gtk_tree_view_enable_model_drag_source(
            GTK_TREE_VIEW(listview->widget),
            GDK_BUTTON1_MASK,
            targetentries,
            2,
            GDK_ACTION_COPY);
    
    g_signal_connect(listview->widget, "drag-data-get", G_CALLBACK(ui_listview_drag_getdata), listview);
    g_signal_connect(listview->widget, "drag-end", G_CALLBACK(ui_listview_drag_end), listview);
}


static void ui_listview_drag_data_received(
        GtkWidget *self,
        GdkDragContext *context,
        gint x,
        gint y,
        GtkSelectionData *data,
        guint info,
        guint time,
        gpointer user_data)
{
    UiListView *listview = user_data;
    UiDnD dnd;
    dnd.context = context;
    dnd.data = data;
    dnd.selected_action = 0;
    dnd.delete = FALSE;
    dnd.accept = FALSE;
    
    if(listview->ondrop) {
        dnd.accept = TRUE;
        UiEvent event;
        event.obj = listview->obj;
        event.window = event.obj->window;
        event.document = event.obj->ctx->document;
        event.eventdata = &dnd;
        event.intval = 0;
        event.set = ui_get_setop();
        listview->ondrop(&event, listview->ondropdata);
    }
}

void ui_listview_enable_drop(UiListView *listview, UiListArgs *args) {
    gtk_tree_view_enable_model_drag_dest(
            GTK_TREE_VIEW(listview->widget),
            targetentries,
            3,
            GDK_ACTION_COPY);
    if(listview->ondrop) {
        g_signal_connect(listview->widget, "drag_data_received", G_CALLBACK(ui_listview_drag_data_received), listview);
    }
}

#endif


GtkWidget* ui_get_tree_widget(UIWIDGET widget) {
    return SCROLLEDWINDOW_GET_CHILD(widget);
}

static char** targets2array(char *target0, va_list ap, int *nelm) {
    int al = 16;
    char **targets = calloc(16, sizeof(char*));
    targets[0] = target0;
    
    int i = 1;
    char *target;
    while((target = va_arg(ap, char*)) != NULL) {
        if(i >= al) {
            al *= 2;
            targets = realloc(targets, al*sizeof(char*));
        }
        targets[i] = target;
        i++;
    }
    
    *nelm = i;
    return targets;
}

/*
static GtkTargetEntry* targetstr2gtktargets(char **str, int nelm) {
    GtkTargetEntry *targets = calloc(nelm, sizeof(GtkTargetEntry));
    for(int i=0;i<nelm;i++) {
        targets[i].target = str[i];
    }
    return targets;
}
*/

void ui_table_dragsource(UIWIDGET tablewidget, int actions, char *target0, ...) { 
    va_list ap;
    va_start(ap, target0);
    int nelm;
    char **targets = targets2array(target0, ap, &nelm);
    va_end(ap);
    
    // disabled
    //ui_table_dragsource_a(tablewidget, actions, targets, nelm);
    
    free(targets);
}

/*
void ui_table_dragsource_a(UIWIDGET tablewidget, int actions, char **targets, int nelm) {
    GtkTargetEntry* t = targetstr2gtktargets(targets, nelm);
    gtk_tree_view_enable_model_drag_source(
            GTK_TREE_VIEW(ui_get_tree_widget(tablewidget)),
            GDK_BUTTON1_MASK,
            t,
            nelm,
            GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_LINK);
    free(t);
}


void ui_table_dragdest(UIWIDGET tablewidget, int actions, char *target0, ...) {
    va_list ap;
    va_start(ap, target0);
    int nelm;
    char **targets = targets2array(target0, ap, &nelm);
    va_end(ap);
    ui_table_dragdest_a(tablewidget, actions, targets, nelm);
    free(targets);
}

void ui_table_dragdest_a(UIWIDGET tablewidget, int actions, char **targets, int nelm) {
    GtkTargetEntry* t = targetstr2gtktargets(targets, nelm);
    gtk_tree_view_enable_model_drag_dest(
            GTK_TREE_VIEW(ui_get_tree_widget(tablewidget)),
            t,
            nelm,
            GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_LINK);
    free(t);
}
*/

void ui_listview_destroy(GtkWidget *w, UiListView *v) {
    //gtk_tree_view_set_model(GTK_TREE_VIEW(w), NULL);
    if(v->var) {
        ui_destroy_boundvar(v->obj->ctx, v->var);
    }
    if(v->elements) {
        for(int i=0;i<v->nelm;i++) {
            free(v->elements[i]);
        }
        free(v->elements);
    }
#if GTK_CHECK_VERSION(4, 10, 0)
    free(v->columns);
#endif
    free(v->selection.rows);
    free(v);
}

void ui_combobox_destroy(GtkWidget *w, UiListView *v) {
    if(v->var) {
        ui_destroy_boundvar(v->obj->ctx, v->var);
    }
    if(v->elements) {
        for(int i=0;i<v->nelm;i++) {
            free(v->elements[i]);
        }
        free(v->elements);
    }
    free(v);
}


/* ------------------------------ Source List ------------------------------ */

static void ui_destroy_sourcelist(GtkWidget *w, UiListBox *v) {
    cxListFree(v->sublists);
    free(v);
}

static void sublist_destroy(UiObject *obj, UiListBoxSubList *sublist) {
    free(sublist->header);
    ui_destroy_boundvar(obj->ctx, sublist->var);
    cxListFree(sublist->widgets);
}

static void listbox_create_header(GtkListBoxRow* row, GtkListBoxRow* before, gpointer user_data) {
    // first rows in sublists have the ui_listbox property
    UiListBox *listbox = g_object_get_data(G_OBJECT(row), "ui_listbox");
    if(!listbox) {
        return;
    }
    
    UiListBoxSubList *sublist = g_object_get_data(G_OBJECT(row), "ui_listbox_sublist");
    if(!sublist) {
        return;
    }
    
    if(sublist->separator) {
        GtkWidget *separator = gtk_separator_new(GTK_ORIENTATION_HORIZONTAL);
        gtk_list_box_row_set_header(row, separator);
    } else if(sublist->header) {
        GtkWidget *header = gtk_label_new(sublist->header);
        gtk_widget_set_halign(header, GTK_ALIGN_START);
        if(row == listbox->first_row) {
            WIDGET_ADD_CSS_CLASS(header, "ui-listbox-header-first");
        } else {
            WIDGET_ADD_CSS_CLASS(header, "ui-listbox-header");
        }
        gtk_list_box_row_set_header(row, header);
    }
} 

#ifdef UI_GTK3
typedef struct _UiSidebarListBoxClass {
    GtkListBoxClass parent_class; 
} UiSidebarListBoxClass;

typedef struct _UiSidebarListBox {
    GtkListBox parent_instance;
} UiSidebarListBox;

G_DEFINE_TYPE(UiSidebarListBox, ui_sidebar_list_box, GTK_TYPE_LIST_BOX)

/* Initialize the instance */
static void ui_sidebar_list_box_class_init(UiSidebarListBoxClass *klass) {
    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
    gtk_widget_class_set_css_name (widget_class, "placessidebar");
}

static void ui_sidebar_list_box_init(UiSidebarListBox *self) {
    
}
#endif


static void add_sublist(UiListBox *uilistbox, CxList *sublists, UiSubList *sublist) {
    UiListBoxSubList uisublist;
    uisublist.var = uic_widget_var(
            uilistbox->obj->ctx,
            uilistbox->obj->ctx,
            sublist->value,
            sublist->varname,
            UI_VAR_LIST);
    uisublist.numitems = 0;
    uisublist.header = sublist->header ? strdup(sublist->header) : NULL;
    uisublist.separator = sublist->separator;
    uisublist.widgets = cxLinkedListCreateSimple(CX_STORE_POINTERS);
    uisublist.listbox = uilistbox;
    uisublist.userdata = sublist->userdata;
    uisublist.index = cxListSize(sublists);

    // bind UiList
    UiListBoxSubList *sublist_ptr = cxListAt(uilistbox->sublists, cxListSize(sublists)-1);
    UiList *list = uisublist.var->value;
    if(list) {
        list->obj = sublist_ptr;
        list->update = ui_listbox_list_update;
    }

    cxListAdd(sublists, &uisublist);
}

UIEXPORT UIWIDGET ui_sourcelist_create(UiObject *obj, UiSourceListArgs *args) {
    UiObject* current = uic_current_obj(obj);
    
#ifdef UI_GTK3
    GtkWidget *listbox = g_object_new(ui_sidebar_list_box_get_type(), NULL);
#else
    GtkWidget *listbox = gtk_list_box_new();
#endif
    if(!args->style_class) {
#if GTK_MAJOR_VERSION >= 4
        WIDGET_ADD_CSS_CLASS(listbox, "navigation-sidebar");
#else
        WIDGET_ADD_CSS_CLASS(listbox, "sidebar");
#endif
    }
    gtk_list_box_set_header_func(GTK_LIST_BOX(listbox), listbox_create_header, NULL, NULL);
    GtkWidget *scroll_area = SCROLLEDWINDOW_NEW();
    SCROLLEDWINDOW_SET_CHILD(scroll_area, listbox);
    
    ui_set_name_and_style(listbox, args->name, args->style_class);
    ui_set_widget_groups(obj->ctx, listbox, args->groups);
    UI_APPLY_LAYOUT2(current, args);
    current->container->add(current->container, scroll_area);
    
    UiListBox *uilistbox = malloc(sizeof(UiListBox));
    uilistbox->obj = obj;
    uilistbox->listbox = GTK_LIST_BOX(listbox);
    uilistbox->getvalue = args->getvalue;
    uilistbox->getvaluedata = args->getvaluedata;
    uilistbox->onactivate = args->onactivate;
    uilistbox->onactivatedata = args->onactivatedata;
    uilistbox->onbuttonclick = args->onbuttonclick;
    uilistbox->onbuttonclickdata = args->onbuttonclickdata;
    uilistbox->sublists = cxArrayListCreateSimple(sizeof(UiListBoxSubList), 4);
    uilistbox->sublists->collection.advanced_destructor = (cx_destructor_func2)sublist_destroy;
    uilistbox->sublists->collection.destructor_data = obj;
    uilistbox->first_row = NULL;
    
    if(args->sublists) {
        // static sublist initalization
        if(args->numsublists == 0 && args->sublists) {
            args->numsublists = INT_MAX;
        }
        for(int i=0;i<args->numsublists;i++) {
            UiSubList sublist = args->sublists[i];
            if(!sublist.varname && !sublist.value) {
                break;
            }
            
            add_sublist(uilistbox, uilistbox->sublists, &sublist);
        }
        
        // fill items
        ui_listbox_update(uilistbox, 0, cxListSize(uilistbox->sublists));
    } else {
        UiVar* var = uic_widget_var(obj->ctx, current->ctx, args->dynamic_sublist, args->varname, UI_VAR_LIST);
        if(var) {
            UiList *list = var->value;
            list->obj = uilistbox;
            list->update = ui_listbox_dynamic_update;
            
            ui_listbox_dynamic_update(list, -1);
        }
    }
    
    // register uilistbox for both widgets, so it doesn't matter which
    // widget is used later
    g_object_set_data(G_OBJECT(scroll_area), "ui_listbox", uilistbox);
    g_object_set_data(G_OBJECT(listbox), "ui_listbox", uilistbox);
    
    // signals
    g_signal_connect(
                listbox,
                "destroy",
                G_CALLBACK(ui_destroy_sourcelist),
                uilistbox);
    
    if(args->onactivate) {
        g_signal_connect(
                listbox,
                "row-activated",
                G_CALLBACK(ui_listbox_row_activate),
                NULL);
    }
    
    return scroll_area;
}

void ui_listbox_dynamic_update(UiList *list, int x) {
    UiListBox *uilistbox = list->obj;
    
    // unbind/free previous list vars
    CxIterator i = cxListIterator(uilistbox->sublists);
    cx_foreach(UiListBoxSubList *, s, i) {
        // TODO: "unbind/free previous list vars" will also remove
        //       the widget list. This makes the widget optimization 
        //       in ui_listbox_update_sublist pointless
        //       Is it actually possible to not recreate the whole list?
        CxIterator r = cxListIterator(s->widgets);
        cx_foreach(GtkWidget*, widget, r) {
            LISTBOX_REMOVE(uilistbox->listbox, widget);
        }
        
        if(s->var) {
            UiList *sl = s->var->value;
            sl->obj = NULL;
            sl->update = NULL;
            if(s->var->type == UI_VAR_SPECIAL) {
                ui_free(s->var->from_ctx, s->var);
            }
        }
    }
    
    cxListFree(uilistbox->sublists);
    CxList *new_sublists = cxArrayListCreateSimple(sizeof(UiListBoxSubList), list->count(list));
    uilistbox->sublists = new_sublists;
    
    UiSubList *sublist = list->first(list);
    while(sublist) {
        add_sublist(uilistbox, new_sublists, sublist);
        sublist = list->next(list);
    }
    
    ui_listbox_update(uilistbox, 0, cxListSize(uilistbox->sublists));
}

void ui_listbox_update(UiListBox *listbox, int from, int to) {
    CxIterator i = cxListIterator(listbox->sublists);
    size_t pos = 0;
    cx_foreach(UiListBoxSubList *, sublist, i) {
        if(i.index < from) {
            pos += sublist->numitems;
            continue;
        }
        if(i.index > to) {
            break;
        }
        
        // reload sublist
        ui_listbox_update_sublist(listbox, sublist, pos);
        pos += sublist->numitems;
    }
}

static GtkWidget* create_listbox_row(UiListBox *listbox, UiListBoxSubList *sublist, UiSubListItem *item, int index) {
    GtkWidget *hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 10);
    if(item->icon) {
        GtkWidget *icon = ICON_IMAGE(item->icon);
        BOX_ADD(hbox, icon);
    }
    GtkWidget *label = gtk_label_new(item->label);
    gtk_widget_set_halign(label, GTK_ALIGN_START);
    BOX_ADD_EXPAND(hbox, label);
    // TODO: badge, button
    GtkWidget *row = gtk_list_box_row_new();
    LISTBOX_ROW_SET_CHILD(row, hbox);
    
    // signals 
    UiEventDataExt *event = malloc(sizeof(UiEventDataExt));
    memset(event, 0, sizeof(UiEventDataExt));
    event->obj = listbox->obj;
    event->customdata0 = sublist;
    event->customdata1 = sublist->var;
    event->customdata2 = item->eventdata;
    event->callback = listbox->onactivate;
    event->userdata = listbox->onactivatedata;
    event->callback2 = listbox->onbuttonclick;
    event->userdata2 = listbox->onbuttonclickdata;
    event->value0 = index;
    
    g_signal_connect(
            row,
            "destroy",
            G_CALLBACK(ui_destroy_userdata),
            event);
    
    g_object_set_data(G_OBJECT(row), "ui-listbox-row-eventdata", event);
    
    return row;
}

void ui_listbox_update_sublist(UiListBox *listbox, UiListBoxSubList *sublist, size_t listbox_insert_index) {
    // clear sublist
    CxIterator r = cxListIterator(sublist->widgets);
    cx_foreach(GtkWidget*, widget, r) {
        LISTBOX_REMOVE(listbox->listbox, widget);
    }
    cxListClear(sublist->widgets);
    
    sublist->numitems = 0;
    
    // create items for each UiList element
    UiList *list = sublist->var->value;
    if(!list) {
        return;
    }
    
    size_t index = 0;
    void *elm = list->first(list);
    while(elm) {
        UiSubListItem item = { NULL, NULL, NULL, NULL, NULL, NULL };
        if(listbox->getvalue) {
            listbox->getvalue(list, sublist->userdata, elm, index, &item, listbox->getvaluedata);
        } else {
            item.label = strdup(elm);
        }
        
        // create listbox item
        GtkWidget *row = create_listbox_row(listbox, sublist, &item, (int)index);
        if(index == 0) {
            // first row in the sublist, set ui_listbox data to the row
            // which is then used by the headerfunc
            g_object_set_data(G_OBJECT(row), "ui_listbox", listbox);
            g_object_set_data(G_OBJECT(row), "ui_listbox_sublist", sublist);
            
            if(listbox_insert_index == 0) {
                // first row in the GtkListBox
                listbox->first_row = GTK_LIST_BOX_ROW(row);
            }
        }
        intptr_t rowindex = listbox_insert_index + index;
        g_object_set_data(G_OBJECT(row), "ui_listbox_row_index", (gpointer)rowindex);
        gtk_list_box_insert(listbox->listbox, row, listbox_insert_index + index);
        cxListAdd(sublist->widgets, row);
        
        // cleanup
        free(item.label);
        free(item.icon);
        free(item.button_label);
        free(item.button_icon);
        free(item.badge);
        
        // next row
        elm = list->next(list);
        index++;
    }
    
    sublist->numitems = cxListSize(sublist->widgets);
}

void ui_listbox_list_update(UiList *list, int i) {
    UiListBoxSubList *sublist = list->obj;
}

void ui_listbox_row_activate(GtkListBox *self, GtkListBoxRow *row, gpointer user_data) {
    UiEventDataExt *data = g_object_get_data(G_OBJECT(row), "ui-listbox-row-eventdata");
    if(!data) {
        return;
    }
    UiListBoxSubList *sublist = data->customdata0;
    
    UiSubListEventData eventdata;
    eventdata.list = sublist->var->value;
    eventdata.sublist_index = sublist->index;
    eventdata.row_index = data->value0;
    eventdata.sublist_userdata = sublist->userdata;
    eventdata.row_data = eventdata.list->get(eventdata.list, eventdata.row_index);
    eventdata.event_data = data->customdata2;
    
    UiEvent event;
    event.obj = data->obj;
    event.window = event.obj->window;
    event.document = event.obj->ctx->document;
    event.eventdata = &eventdata;
    event.eventdatatype = UI_EVENT_DATA_SUBLIST;
    event.intval = data->value0;
    event.set = ui_get_setop();
    
    if(data->callback) {
        data->callback(&event, data->userdata);
    }
}