notebook.c

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/*
 *      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);
 
    gtk_menu_popup(GTK_MENU(menu), NULL, NULL, 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;
}
 
 
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);
 
    /* 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);
 
    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);
}