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[geany-mirror.git] / src / notebook.c

/*
 *      notebook.c - this file is part of Geany, a fast and lightweight IDE
 *
 *      Copyright 2006 The Geany contributors
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License along
 *      with this program; if not, write to the Free Software Foundation, Inc.,
 *      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * Notebook tab Drag 'n' Drop reordering and tab management.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "notebook.h"

#include "callbacks.h"
#include "documentprivate.h"
#include "geanyobject.h"
#include "keybindings.h"
#include "main.h"
#include "support.h"
#include "ui_utils.h"
#include "utils.h"

#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>


#define GEANY_DND_NOTEBOOK_TAB_TYPE     "geany_dnd_notebook_tab"

static const GtkTargetEntry drag_targets[] =
{
        {GEANY_DND_NOTEBOOK_TAB_TYPE, GTK_TARGET_SAME_APP | GTK_TARGET_SAME_WIDGET, 0}
};

static GtkTargetEntry files_drop_targets[] = {
        { "STRING",                     0, 0 },
        { "UTF8_STRING",        0, 0 },
        { "text/plain",         0, 0 },
        { "text/uri-list",      0, 0 }
};

static const gsize MAX_MRU_DOCS = 20;
static GQueue *mru_docs = NULL;
static guint mru_pos = 0;

static gboolean switch_in_progress = FALSE;
static GtkWidget *switch_dialog = NULL;
static GtkWidget *switch_dialog_label = NULL;


static void
notebook_page_reordered_cb(GtkNotebook *notebook, GtkWidget *child, guint page_num,
                gpointer user_data);

static void
on_window_drag_data_received(GtkWidget *widget, GdkDragContext *drag_context,
                gint x, gint y, GtkSelectionData *data, guint target_type,
                guint event_time, gpointer user_data);

static void
notebook_tab_close_clicked_cb(GtkButton *button, gpointer user_data);

static void setup_tab_dnd(void);


static void update_mru_docs_head(GeanyDocument *doc)
{
        if (doc)
        {
                g_queue_remove(mru_docs, doc);
                g_queue_push_head(mru_docs, doc);

                if (g_queue_get_length(mru_docs) > MAX_MRU_DOCS)
                        g_queue_pop_tail(mru_docs);
        }
}


/* before the tab changes, add the current document to the MRU list */
static void on_notebook_switch_page(GtkNotebook *notebook,
        gpointer page, guint page_num, gpointer user_data)
{
        GeanyDocument *new;

        new = document_get_from_page(page_num);

        /* insert the very first document (when adding the second document
         * and switching to it) */
        if (g_queue_get_length(mru_docs) == 0 && gtk_notebook_get_n_pages(notebook) == 2)
                update_mru_docs_head(document_get_current());

        if (!switch_in_progress)
                update_mru_docs_head(new);
}


static void on_document_close(GObject *obj, GeanyDocument *doc)
{
        if (! main_status.quitting)
        {
                g_queue_remove(mru_docs, doc);
                /* this prevents the pop up window from showing when there's a single
                 * document */
                if (gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook)) == 2)
                        g_queue_clear(mru_docs);
        }
}


static GtkWidget *ui_minimal_dialog_new(GtkWindow *parent, const gchar *title)
{
        GtkWidget *dialog;

        dialog = gtk_window_new(GTK_WINDOW_POPUP);

        if (parent)
        {
                gtk_window_set_transient_for(GTK_WINDOW(dialog), parent);
                gtk_window_set_destroy_with_parent(GTK_WINDOW(dialog), TRUE);
        }
        gtk_window_set_title(GTK_WINDOW(dialog), title);
        gtk_window_set_type_hint(GTK_WINDOW(dialog), GDK_WINDOW_TYPE_HINT_DIALOG);
        gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER_ON_PARENT);

        gtk_widget_set_name(dialog, "GeanyDialog");
        return dialog;
}


static gboolean is_modifier_key(guint keyval)
{
        switch (keyval)
        {
                case GDK_KEY_Shift_L:
                case GDK_KEY_Shift_R:
                case GDK_KEY_Control_L:
                case GDK_KEY_Control_R:
                case GDK_KEY_Meta_L:
                case GDK_KEY_Meta_R:
                case GDK_KEY_Alt_L:
                case GDK_KEY_Alt_R:
                case GDK_KEY_Super_L:
                case GDK_KEY_Super_R:
                case GDK_KEY_Hyper_L:
                case GDK_KEY_Hyper_R:
                        return TRUE;
                default:
                        return FALSE;
        }
}


static gboolean on_key_release_event(GtkWidget *widget, GdkEventKey *ev, gpointer user_data)
{
        /* user may have rebound keybinding to a different modifier than Ctrl, so check all */
        if (switch_in_progress && is_modifier_key(ev->keyval))
        {
                GeanyDocument *doc;

                switch_in_progress = FALSE;

                if (switch_dialog)
                {
                        gtk_widget_destroy(switch_dialog);
                        switch_dialog = NULL;
                }

                doc = document_get_current();
                update_mru_docs_head(doc);
                mru_pos = 0;
                document_check_disk_status(doc, TRUE);
        }
        return FALSE;
}


static GtkWidget *create_switch_dialog(void)
{
        GtkWidget *dialog, *widget, *vbox;

        dialog = ui_minimal_dialog_new(GTK_WINDOW(main_widgets.window), _("Switch to Document"));
        gtk_window_set_decorated(GTK_WINDOW(dialog), FALSE);
        gtk_window_set_default_size(GTK_WINDOW(dialog), 200, -1);

        vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 6);
        gtk_container_set_border_width(GTK_CONTAINER(vbox), 12);
        gtk_container_add(GTK_CONTAINER(dialog), vbox);

        widget = gtk_image_new_from_stock(GTK_STOCK_JUMP_TO, GTK_ICON_SIZE_BUTTON);
        gtk_container_add(GTK_CONTAINER(vbox), widget);

        widget = gtk_label_new(NULL);
        gtk_label_set_justify(GTK_LABEL(widget), GTK_JUSTIFY_CENTER);
        gtk_container_add(GTK_CONTAINER(vbox), widget);
        switch_dialog_label = widget;

        g_signal_connect(dialog, "key-release-event", G_CALLBACK(on_key_release_event), NULL);
        return dialog;
}


static void update_filename_label(void)
{
        guint i;
        gchar *msg = NULL;
        guint queue_length;
        GeanyDocument *doc;

        if (!switch_dialog)
        {
                switch_dialog = create_switch_dialog();
                gtk_widget_show_all(switch_dialog);
        }

        queue_length = g_queue_get_length(mru_docs);
        for (i = mru_pos; (i <= mru_pos + 3) && (doc = g_queue_peek_nth(mru_docs, i % queue_length)); i++)
        {
                gchar *basename;

                basename = g_path_get_basename(DOC_FILENAME(doc));
                if (i == mru_pos)
                        msg = g_markup_printf_escaped ("<b>%s</b>", basename);
                else if (i % queue_length == mru_pos)    /* && i != mru_pos */
                {
                        /* We have wrapped around and got to the starting document again */
                        g_free(basename);
                        break;
                }
                else
                {
                        SETPTR(basename, g_markup_printf_escaped ("\n%s", basename));
                        SETPTR(msg, g_strconcat(msg, basename, NULL));
                }
                g_free(basename);
        }
        gtk_label_set_markup(GTK_LABEL(switch_dialog_label), msg);
        g_free(msg);
}


static gboolean on_switch_timeout(G_GNUC_UNUSED gpointer data)
{
        if (!switch_in_progress || switch_dialog)
        {
                return FALSE;
        }

        update_filename_label();
        return FALSE;
}


void notebook_switch_tablastused(void)
{
        GeanyDocument *last_doc;
        gboolean switch_start = !switch_in_progress;

        mru_pos += 1;
        last_doc = g_queue_peek_nth(mru_docs, mru_pos);

        if (! DOC_VALID(last_doc))
        {
                utils_beep();
                mru_pos = 0;
                last_doc = g_queue_peek_nth(mru_docs, mru_pos);
        }
        if (! DOC_VALID(last_doc))
                return;

        switch_in_progress = TRUE;
        document_show_tab(last_doc);

        /* if there's a modifier key, we can switch back in MRU order each time unless
         * the key is released */
        if (switch_start)
                g_timeout_add(600, on_switch_timeout, NULL);
        else
                update_filename_label();
}


gboolean notebook_switch_in_progress(void)
{
        return switch_in_progress;
}


static gboolean focus_sci(GtkWidget *widget, GdkEventButton *event, gpointer user_data)
{
        GeanyDocument *doc = document_get_current();

        if (doc != NULL && event->button == 1)
                gtk_widget_grab_focus(GTK_WIDGET(doc->editor->sci));

        return FALSE;
}


static gboolean gtk_notebook_show_arrows(GtkNotebook *notebook)
{
        return gtk_notebook_get_scrollable(notebook);
#if 0
        /* To get this working we would need to define at least the first two fields of
         * GtkNotebookPage since it is a private field. The better way would be to
         * subclass GtkNotebook.
struct _FakeGtkNotebookPage
{
        GtkWidget *child;
        GtkWidget *tab_label;
};
 */
        gboolean show_arrow = FALSE;
        GList *children;

        if (! notebook->scrollable)
                return FALSE;

        children = notebook->children;
        while (children)
        {
                struct _FakeGtkNotebookPage *page = children->data;

                if (page->tab_label && ! gtk_widget_get_child_visible(page->tab_label))
                        show_arrow = TRUE;

                children = children->next;
        }
        return show_arrow;
#endif
}


static gboolean is_position_on_tab_bar(GtkNotebook *notebook, GdkEventButton *event)
{
        GtkWidget *page;
        GtkWidget *tab;
        GtkWidget *nb;
        GtkPositionType tab_pos;
        gint scroll_arrow_hlength, scroll_arrow_vlength;
        gdouble x, y;

        page = gtk_notebook_get_nth_page(notebook, 0);
        g_return_val_if_fail(page != NULL, FALSE);

        tab = gtk_notebook_get_tab_label(notebook, page);
        g_return_val_if_fail(tab != NULL, FALSE);

        tab_pos = gtk_notebook_get_tab_pos(notebook);
        nb = GTK_WIDGET(notebook);

        gtk_widget_style_get(GTK_WIDGET(notebook), "scroll-arrow-hlength", &scroll_arrow_hlength,
                "scroll-arrow-vlength", &scroll_arrow_vlength, NULL);

        if (! gdk_event_get_coords((GdkEvent*) event, &x, &y))
        {
                x = event->x;
                y = event->y;
        }

        switch (tab_pos)
        {
                case GTK_POS_TOP:
                case GTK_POS_BOTTOM:
                {
                        if (event->y >= 0 && event->y <= gtk_widget_get_allocated_height(tab))
                        {
                                if (! gtk_notebook_show_arrows(notebook) || (
                                        x > scroll_arrow_hlength &&
                                        x < gtk_widget_get_allocated_width(nb) - scroll_arrow_hlength))
                                        return TRUE;
                        }
                        break;
                }
                case GTK_POS_LEFT:
                case GTK_POS_RIGHT:
                {
                        if (event->x >= 0 && event->x <= gtk_widget_get_allocated_width(tab))
                        {
                                if (! gtk_notebook_show_arrows(notebook) || (
                                        y > scroll_arrow_vlength &&
                                        y < gtk_widget_get_allocated_height(nb) - scroll_arrow_vlength))
                                        return TRUE;
                        }
                }
        }

        return FALSE;
}


static void tab_bar_menu_activate_cb(GtkMenuItem *menuitem, gpointer data)
{
        GeanyDocument *doc = data;

        if (! DOC_VALID(doc))
                return;

        document_show_tab(doc);
}


static void on_open_in_new_window_activate(GtkMenuItem *menuitem, gpointer user_data)
{
        GeanyDocument *doc = user_data;
        gchar *doc_path;

        g_return_if_fail(doc->is_valid);

        doc_path = utils_get_locale_from_utf8(doc->file_name);
        utils_start_new_geany_instance(doc_path);
        g_free(doc_path);
}


static gboolean has_tabs_on_right(GeanyDocument *doc)
{
        GtkNotebook *nb = GTK_NOTEBOOK(main_widgets.notebook);
        gint total_pages = gtk_notebook_get_n_pages(nb);
        gint doc_page = document_get_notebook_page(doc);
        return total_pages > (doc_page + 1);
}


static void on_close_documents_right_activate(GtkMenuItem *menuitem, GeanyDocument *doc)
{
        g_return_if_fail(has_tabs_on_right(doc));
        GtkNotebook *nb = GTK_NOTEBOOK(main_widgets.notebook);
        gint current_page = gtk_notebook_get_current_page(nb);
        gint doc_page = document_get_notebook_page(doc);
        for (gint i = doc_page + 1; i < gtk_notebook_get_n_pages(nb); )
        {
                if (! document_close(document_get_from_page(i)))
                        i++; // only increment if tab wasn't closed
        }
        /* keep the current tab to the original one unless it has been closed, in
         * which case use the activated one */
        gtk_notebook_set_current_page(nb, MIN(current_page, doc_page));
}


static void show_tab_bar_popup_menu(GdkEventButton *event, GeanyDocument *doc)
{
        GtkWidget *menu_item;
        static GtkWidget *menu = NULL;

        if (menu == NULL)
                menu = gtk_menu_new();

        /* clear the old menu items */
        gtk_container_foreach(GTK_CONTAINER(menu), (GtkCallback) gtk_widget_destroy, NULL);

        ui_menu_add_document_items(GTK_MENU(menu), document_get_current(),
                G_CALLBACK(tab_bar_menu_activate_cb));

        menu_item = gtk_separator_menu_item_new();
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);

        menu_item = ui_image_menu_item_new(GTK_STOCK_OPEN, _("Open in New _Window"));
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);
        g_signal_connect(menu_item, "activate",
                G_CALLBACK(on_open_in_new_window_activate), doc);
        /* disable if not on disk */
        if (doc == NULL || !doc->real_path)
                gtk_widget_set_sensitive(menu_item, FALSE);

        menu_item = gtk_separator_menu_item_new();
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);

        menu_item = gtk_image_menu_item_new_from_stock(GTK_STOCK_CLOSE, NULL);
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);
        g_signal_connect(menu_item, "activate", G_CALLBACK(notebook_tab_close_clicked_cb), doc);
        gtk_widget_set_sensitive(GTK_WIDGET(menu_item), (doc != NULL));

        menu_item = ui_image_menu_item_new(GTK_STOCK_CLOSE, _("Close Ot_her Documents"));
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);
        g_signal_connect(menu_item, "activate", G_CALLBACK(on_close_other_documents1_activate), doc);
        gtk_widget_set_sensitive(GTK_WIDGET(menu_item), (doc != NULL));

        menu_item = ui_image_menu_item_new(GTK_STOCK_CLOSE, _("Close Documents to the _Right"));
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);
        g_signal_connect(menu_item, "activate", G_CALLBACK(on_close_documents_right_activate), doc);
        gtk_widget_set_sensitive(GTK_WIDGET(menu_item), doc != NULL && has_tabs_on_right(doc));

        menu_item = ui_image_menu_item_new(GTK_STOCK_CLOSE, _("C_lose All"));
        gtk_widget_show(menu_item);
        gtk_container_add(GTK_CONTAINER(menu), menu_item);
        g_signal_connect(menu_item, "activate", G_CALLBACK(on_close_all1_activate), NULL);

        ui_menu_popup(GTK_MENU(menu), NULL, NULL, event->button, event->time);
}


static gboolean notebook_tab_bar_click_cb(GtkWidget *widget, GdkEventButton *event,
                                                                                  gpointer user_data)
{
        if (event->type == GDK_2BUTTON_PRESS)
        {
                GtkNotebook *notebook = GTK_NOTEBOOK(widget);
                GtkWidget *event_widget = gtk_get_event_widget((GdkEvent *) event);
                GtkWidget *child = gtk_notebook_get_nth_page(notebook, gtk_notebook_get_current_page(notebook));

                /* ignore events from the content of the page (impl. stolen from GTK2 tab scrolling)
                 * TODO: we should also ignore notebook's action widgets, but that's more work and
                 * we don't have any of them yet anyway -- and GTK 2.16 don't have those actions. */
                if (event_widget == NULL || event_widget == child || gtk_widget_is_ancestor(event_widget, child))
                        return FALSE;

                if (is_position_on_tab_bar(notebook, event))
                {
                        document_new_file(NULL, NULL, NULL);
                        return TRUE;
                }
        }
        /* right-click is also handled here if it happened on the notebook tab bar but not
         * on a tab directly */
        else if (event->button == 3)
        {
                show_tab_bar_popup_menu(event, NULL);
                return TRUE;
        }
        return FALSE;
}


static gboolean notebook_tab_bar_scroll_cb(GtkWidget *widget, GdkEventScroll *event)
{
        GtkNotebook *notebook = GTK_NOTEBOOK(widget);
        GtkWidget *child;

        child = gtk_notebook_get_nth_page(notebook, gtk_notebook_get_current_page(notebook));
        if (child == NULL)
                return FALSE;

        switch (event->direction)
        {
                case GDK_SCROLL_RIGHT:
                case GDK_SCROLL_DOWN:
                        gtk_notebook_next_page(notebook);
                        break;
                case GDK_SCROLL_LEFT:
                case GDK_SCROLL_UP:
                        gtk_notebook_prev_page(notebook);
                        break;
                default:
                        break;
        }

        return TRUE;
}


void notebook_init(void)
{
        g_signal_connect_after(main_widgets.notebook, "button-press-event",
                G_CALLBACK(notebook_tab_bar_click_cb), NULL);

        g_signal_connect(main_widgets.notebook, "drag-data-received",
                G_CALLBACK(on_window_drag_data_received), NULL);

        mru_docs = g_queue_new();
        g_signal_connect(main_widgets.notebook, "switch-page",
                G_CALLBACK(on_notebook_switch_page), NULL);
        g_signal_connect(geany_object, "document-close",
                G_CALLBACK(on_document_close), NULL);

        gtk_widget_add_events(main_widgets.notebook, GDK_SCROLL_MASK);
        g_signal_connect(main_widgets.notebook, "scroll-event", G_CALLBACK(notebook_tab_bar_scroll_cb), NULL);

        /* in case the switch dialog misses an event while drawing the dialog */
        g_signal_connect(main_widgets.window, "key-release-event", G_CALLBACK(on_key_release_event), NULL);

        setup_tab_dnd();
}


void notebook_free(void)
{
        g_queue_free(mru_docs);
}


static void setup_tab_dnd(void)
{
        GtkWidget *notebook = main_widgets.notebook;

        g_signal_connect(notebook, "page-reordered", G_CALLBACK(notebook_page_reordered_cb), NULL);
}


static void
notebook_page_reordered_cb(GtkNotebook *notebook, GtkWidget *child, guint page_num,
        gpointer user_data)
{
        /* Not necessary to update open files treeview if it's sorted.
         * Note: if enabled, it's best to move the item instead of recreating all items. */
        /*sidebar_openfiles_update_all();*/
}


/* call this after the number of tabs in main_widgets.notebook changes. */
static void tab_count_changed(void)
{
        switch (gtk_notebook_get_n_pages(GTK_NOTEBOOK(main_widgets.notebook)))
        {
                case 0:
                /* Enables DnD for dropping files into the empty notebook widget */
                gtk_drag_dest_set(main_widgets.notebook, GTK_DEST_DEFAULT_ALL,
                        files_drop_targets,     G_N_ELEMENTS(files_drop_targets),
                        GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK | GDK_ACTION_ASK);
                break;

                case 1:
                /* Disables DnD for dropping files into the notebook widget and enables the DnD for moving file
                 * tabs. Files can still be dropped into the notebook widget because it will be handled by the
                 * active Scintilla Widget (only dropping to the tab bar is not possible but it should be ok) */
                gtk_drag_dest_set(main_widgets.notebook, GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_DROP,
                        drag_targets, G_N_ELEMENTS(drag_targets), GDK_ACTION_MOVE);
                break;
        }
}


static gboolean notebook_tab_click(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
        guint state;
        GeanyDocument *doc = (GeanyDocument *) data;

        /* toggle additional widgets on double click */
        if (event->type == GDK_2BUTTON_PRESS)
        {
                if (interface_prefs.notebook_double_click_hides_widgets)
                        on_menu_toggle_all_additional_widgets1_activate(NULL, NULL);

                return TRUE; /* stop other handlers like notebook_tab_bar_click_cb() */
        }
        /* close tab on middle click */
        if (event->button == 2)
        {
                document_close(doc);
                return TRUE; /* stop other handlers like notebook_tab_bar_click_cb() */
        }
        /* switch last used tab on ctrl-click */
        state = keybindings_get_modifiers(event->state);
        if (event->button == 1 && state == GEANY_PRIMARY_MOD_MASK)
        {
                keybindings_send_command(GEANY_KEY_GROUP_NOTEBOOK,
                        GEANY_KEYS_NOTEBOOK_SWITCHTABLASTUSED);
                return TRUE;
        }
        /* right-click is first handled here if it happened on a notebook tab */
        if (event->button == 3)
        {
                show_tab_bar_popup_menu(event, doc);
                return TRUE;
        }

        return FALSE;
}


static void notebook_tab_close_button_style_set(GtkWidget *btn, GtkRcStyle *prev_style,
                                                                                                gpointer data)
{
        gint w, h;

        gtk_icon_size_lookup_for_settings(gtk_widget_get_settings(btn), GTK_ICON_SIZE_MENU, &w, &h);
        gtk_widget_set_size_request(btn, w + 2, h + 2);
}


/* Returns page number of notebook page, or -1 on error
 *
 * Note: the widget added to the notebook is *not* shown by this function, so you have to call
 * something like `gtk_widget_show(document_get_notebook_child(doc))` when finished setting up the
 * document.  This is necessary because when the notebook tab is added, the document isn't ready
 * yet, and we  need the notebook to emit ::switch-page after it actually is.  Actually this
 * doesn't prevent the signal to me emitted straight when we insert the page (this looks like a
 * GTK bug), but it emits it again when showing the child, and it's all we need. */
gint notebook_new_tab(GeanyDocument *this)
{
        GtkWidget *hbox, *ebox, *vbox;
        gint tabnum;
        GtkWidget *page;
        gint cur_page;

        g_return_val_if_fail(this != NULL, -1);

        /* page is packed into a vbox so we can stack infobars above it */
        vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
        page = GTK_WIDGET(this->editor->sci);
        gtk_box_pack_start(GTK_BOX(vbox), page, TRUE, TRUE, 0);

        this->priv->tab_label = gtk_label_new(NULL);

        /* get button press events for the tab label and the space between it and
         * the close button, if any */
        ebox = gtk_event_box_new();
        gtk_widget_set_has_window(ebox, FALSE);
        g_signal_connect(ebox, "button-press-event", G_CALLBACK(notebook_tab_click), this);
        /* focus the current document after clicking on a tab */
        g_signal_connect_after(ebox, "button-release-event",
                G_CALLBACK(focus_sci), NULL);

    /* switch tab by scrolling - GTK2 behaviour for GTK3 */
        gtk_widget_add_events(GTK_WIDGET(ebox), GDK_SCROLL_MASK);
        gtk_widget_add_events(GTK_WIDGET(this->priv->tab_label), GDK_SCROLL_MASK);

        hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 2);
        gtk_box_pack_start(GTK_BOX(hbox), this->priv->tab_label, FALSE, FALSE, 0);
        gtk_container_add(GTK_CONTAINER(ebox), hbox);

        if (file_prefs.show_tab_cross)
        {
                GtkWidget *image, *btn, *align;

                btn = gtk_button_new();
                gtk_button_set_relief(GTK_BUTTON(btn), GTK_RELIEF_NONE);
                gtk_button_set_focus_on_click(GTK_BUTTON(btn), FALSE);
                gtk_widget_set_name(btn, "geany-close-tab-button");

                image = gtk_image_new_from_stock(GTK_STOCK_CLOSE, GTK_ICON_SIZE_MENU);
                gtk_container_add(GTK_CONTAINER(btn), image);

                align = gtk_alignment_new(1.0, 0.5, 0.0, 0.0);
                gtk_container_add(GTK_CONTAINER(align), btn);
                gtk_box_pack_start(GTK_BOX(hbox), align, TRUE, TRUE, 0);

                g_signal_connect(btn, "clicked", G_CALLBACK(notebook_tab_close_clicked_cb), this);
                /* button overrides event box, so make middle click on button also close tab */
                g_signal_connect(btn, "button-press-event", G_CALLBACK(notebook_tab_click), this);
                /* handle style modification to keep button small as possible even when theme change */
                g_signal_connect(btn, "style-set", G_CALLBACK(notebook_tab_close_button_style_set), NULL);
        }

        gtk_widget_show_all(ebox);

        document_update_tab_label(this);

        if (file_prefs.tab_order_beside)
                cur_page = gtk_notebook_get_current_page(GTK_NOTEBOOK(main_widgets.notebook));
        else
                cur_page = file_prefs.tab_order_ltr ? -2 /* hack: -2 + 1 = -1, last page */ : 0;
        if (file_prefs.tab_order_ltr)
                tabnum = gtk_notebook_insert_page_menu(GTK_NOTEBOOK(main_widgets.notebook), vbox,
                        ebox, NULL, cur_page + 1);
        else
                tabnum = gtk_notebook_insert_page_menu(GTK_NOTEBOOK(main_widgets.notebook), vbox,
                        ebox, NULL, cur_page);

        tab_count_changed();

        /* enable tab DnD */
        gtk_notebook_set_tab_reorderable(GTK_NOTEBOOK(main_widgets.notebook), vbox, TRUE);

        return tabnum;
}


static void
notebook_tab_close_clicked_cb(GtkButton *button, gpointer data)
{
        GeanyDocument *doc = (GeanyDocument *) data;

        document_close(doc);
}


/* Always use this instead of gtk_notebook_remove_page(). */
void notebook_remove_page(gint page_num)
{
        gint page = gtk_notebook_get_current_page(GTK_NOTEBOOK(main_widgets.notebook));

        if (page_num == page)
        {
                if (file_prefs.tab_order_ltr)
                        page += 1;
                else if (page > 0) /* never go negative, it would select the last page */
                        page -= 1;

                if (file_prefs.tab_close_switch_to_mru)
                {
                        GeanyDocument *last_doc;

                        last_doc = g_queue_peek_nth(mru_docs, 0);
                        if (DOC_VALID(last_doc))
                                page = document_get_notebook_page(last_doc);
                }

                gtk_notebook_set_current_page(GTK_NOTEBOOK(main_widgets.notebook), page);
        }

        /* now remove the page (so we don't temporarily switch to the previous page) */
        gtk_notebook_remove_page(GTK_NOTEBOOK(main_widgets.notebook), page_num);

        tab_count_changed();
}


static void
on_window_drag_data_received(GtkWidget *widget, GdkDragContext *drag_context,
                gint x, gint y, GtkSelectionData *data, guint target_type,
                guint event_time, gpointer user_data)
{
        gboolean success = FALSE;
        gint length = gtk_selection_data_get_length(data);

        if (length > 0 && gtk_selection_data_get_format(data) == 8)
        {
                document_open_file_list((const gchar *)gtk_selection_data_get_data(data), length);

                success = TRUE;
        }
        gtk_drag_finish(drag_context, success, FALSE, event_time);
}