gui_stuff.c

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/***********************************************************************
 Freeciv - Copyright (C) 1996 - A Kjeldberg, L Gregersen, P Unold
   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, 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.
***********************************************************************/
 
#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif
 
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
 
/* utility */
#include "fcintl.h"
#include "log.h"
#include "mem.h"
#include "support.h"
 
/* client */
#include "options.h"
 
/* client/gui-gtk-3.0 */
#include "colors.h"
#include "gui_main.h"
 
#include "gui_stuff.h"
 
 
static GList *dialog_list;
 
static GtkSizeGroup *gui_action;
 
 
/**********************************************************************/
void gtk_expose_now(GtkWidget *w)
{
  gtk_widget_queue_draw(w);
}
 
/**********************************************************************/
void set_relative_window_position(GtkWindow *ref, GtkWindow *w, int px, int py)
{
  gint x, y, width, height;
 
  gtk_window_get_position(ref, &x, &y);
  gtk_window_get_size(ref, &width, &height);
 
  x += px * width / 100;
  y += py * height / 100;
 
  gtk_window_move(w, x, y);
}
 
/**********************************************************************/
GtkWidget *gtk_stockbutton_new(const gchar *stock, const gchar *label_text)
{
  GtkWidget *button;
  GtkWidget *image;
  
  button = gtk_button_new_with_mnemonic(label_text);
  image = gtk_image_new_from_stock(stock, GTK_ICON_SIZE_BUTTON);
  gtk_button_set_image(GTK_BUTTON(button), image);
 
  return button;
}
 
/**********************************************************************/
void gtk_stockbutton_set_label(GtkWidget *button, const gchar *label_text)
{
  gtk_button_set_label(GTK_BUTTON(button), label_text);
}
 
/**********************************************************************/
void intl_slist(int n, const char **s, bool *done)
{
  int i;
 
  if (!*done) {
    for (i = 0; i < n; i++) {
      s[i] = Q_(s[i]);
    }
 
    *done = TRUE;
  }
}
 
/**********************************************************************/
void itree_begin(GtkTreeModel *model, ITree *it)
{
  it->model = model;
  it->end = !gtk_tree_model_get_iter_first(it->model, &it->it);
}
 
/**********************************************************************/
gboolean itree_end(ITree *it)
{
  return it->end;
}
 
/**********************************************************************/
void itree_next(ITree *it)
{
  it->end = !gtk_tree_model_iter_next(it->model, &it->it);
}
 
/**********************************************************************/
void itree_set(ITree *it, ...)
{
  va_list ap;
 
  va_start(ap, it);
  gtk_tree_store_set_valist(GTK_TREE_STORE(it->model), &it->it, ap);
  va_end(ap);
}
 
/**********************************************************************/
void itree_get(ITree *it, ...)
{
  va_list ap;
 
  va_start(ap, it);
  gtk_tree_model_get_valist(it->model, &it->it, ap);
  va_end(ap);
}
 
/**********************************************************************/
void tstore_append(GtkTreeStore *store, ITree *it, ITree *parent)
{
  it->model = GTK_TREE_MODEL(store);
  if (parent) {
    gtk_tree_store_append(GTK_TREE_STORE(it->model), &it->it, &parent->it);
  } else {
    gtk_tree_store_append(GTK_TREE_STORE(it->model), &it->it, NULL);
  }
  it->end = FALSE;
}
 
/**********************************************************************/
gboolean itree_is_selected(GtkTreeSelection *selection, ITree *it)
{
  return gtk_tree_selection_iter_is_selected(selection, &it->it);
}
 
/**********************************************************************/
void itree_select(GtkTreeSelection *selection, ITree *it)
{
  gtk_tree_selection_select_iter(selection, &it->it);
}
 
/**********************************************************************/
void itree_unselect(GtkTreeSelection *selection, ITree *it)
{
  gtk_tree_selection_unselect_iter(selection, &it->it);
}
 
/**********************************************************************/
gint gtk_tree_selection_get_row(GtkTreeSelection *selection)
{
  GtkTreeModel *model;
  GtkTreeIter it;
  gint row = -1;
 
  if (gtk_tree_selection_get_selected(selection, &model, &it)) {
    GtkTreePath *path;
    gint *idx;
 
    path = gtk_tree_model_get_path(model, &it);
    idx = gtk_tree_path_get_indices(path);
    row = idx[0];
    gtk_tree_path_free(path);
  }
  return row;
}
 
/**********************************************************************/
void gtk_tree_view_focus(GtkTreeView *view)
{
  GtkTreeModel *model;
  GtkTreePath *path;
  GtkTreeIter iter;
 
  if ((model = gtk_tree_view_get_model(view))
      && gtk_tree_model_get_iter_first(model, &iter)
      && (path = gtk_tree_model_get_path(model, &iter))) {
    gtk_tree_view_set_cursor(view, path, NULL, FALSE);
    gtk_tree_path_free(path);
    gtk_widget_grab_focus(GTK_WIDGET(view));
  }
}
 
/**********************************************************************/
GtkWidget *gtk_aux_menu_bar_new(void)
{
  GtkWidget *menubar = gtk_menu_bar_new();
 
  /*
   * Ubuntu Linux's Ayatana/Unity desktop environment likes to steal the
   * application's main menu bar from its window and put it at the top of
   * the screen. It needs a hint in order not to steal menu bars other
   * than the main one. Gory details at
   * https://bugs.launchpad.net/ubuntu/+source/freeciv/+bug/743265
   */
  if (g_object_class_find_property(
        G_OBJECT_CLASS(GTK_MENU_BAR_GET_CLASS(menubar)), "ubuntu-local")) {
    g_object_set(G_OBJECT(menubar), "ubuntu-local", TRUE, NULL);
  }
 
  return menubar;
}
 
/**********************************************************************/
static void close_callback(GtkDialog *dialog, gpointer data)
{
  gtk_widget_destroy(GTK_WIDGET(dialog));
}
 
/**********************************************************************/
void setup_dialog(GtkWidget *shell, GtkWidget *parent)
{
  if (GUI_GTK_OPTION(dialogs_on_top) || GUI_GTK_OPTION(fullscreen)) {
    gtk_window_set_transient_for(GTK_WINDOW(shell),
                                 GTK_WINDOW(parent));
    gtk_window_set_type_hint(GTK_WINDOW(shell),
                             GDK_WINDOW_TYPE_HINT_DIALOG);
  } else {
    gtk_window_set_type_hint(GTK_WINDOW(shell),
                             GDK_WINDOW_TYPE_HINT_NORMAL);
  }
 
  /* Close dialog window on Escape keypress. */
  if (GTK_IS_DIALOG(shell)) {
    g_signal_connect_after(shell, "close", G_CALLBACK(close_callback), shell);
  }
}
 
/**********************************************************************/
static void gui_dialog_response(struct gui_dialog *dlg, int response)
{
  if (dlg->response_callback) {
    (*dlg->response_callback)(dlg, response, dlg->user_data);
  }
}
 
/**********************************************************************/
static void gui_dialog_destroyed(struct gui_dialog *dlg, int response,
                                 gpointer data)
{
  gui_dialog_destroy(dlg);
}
 
/**********************************************************************/
static void gui_dialog_destroy_handler(GtkWidget *w, struct gui_dialog *dlg)
{
  if (dlg->type == GUI_DIALOG_TAB) {
    GtkWidget *notebook = dlg->v.tab.notebook;
    gulong handler_id = dlg->v.tab.handler_id;
 
    g_signal_handler_disconnect(notebook, handler_id);
  }
 
  g_object_unref(dlg->gui_button);
 
  if (*(dlg->source)) {
    *(dlg->source) = NULL;
  }
 
  dialog_list = g_list_remove(dialog_list, dlg);
  
  /* Raise the return dialog set by gui_dialog_set_return_dialog() */
  if (dlg->return_dialog_id != -1) {
    GList *it;
 
    for (it = dialog_list; it; it = g_list_next(it)) {
      struct gui_dialog * adialog = (struct gui_dialog *)it->data;
 
      if (adialog->id == dlg->return_dialog_id) {
        gui_dialog_raise(adialog);
        break;
      }
    }
  }
  
  if (dlg->title) {
    free(dlg->title);
  }
  
  free(dlg);
}
 
/**********************************************************************/
static gint gui_dialog_delete_handler(GtkWidget *widget,
                                      GdkEventAny *ev, gpointer data)
{
  struct gui_dialog *dlg = data;
 
  /* emit response signal. */
  gui_dialog_response(dlg, GTK_RESPONSE_DELETE_EVENT);
                                                                               
  /* do the destroy by default. */
  return FALSE;
}
 
/**********************************************************************/
static gint gui_dialog_delete_tab_handler(struct gui_dialog* dlg)
{
  GtkWidget* notebook;
  int n;
  
  notebook = dlg->v.tab.notebook;
  n = gtk_notebook_get_current_page(GTK_NOTEBOOK(notebook));
  if (gtk_notebook_get_nth_page(GTK_NOTEBOOK(notebook), n)
      != dlg->v.tab.child) {
    gui_dialog_set_return_dialog(dlg, NULL);
  }                                                       
  
  /* emit response signal. */
  gui_dialog_response(dlg, GTK_RESPONSE_DELETE_EVENT);
                                                                               
  /* do the destroy by default. */
  return FALSE;
}
 
/**********************************************************************/
static gboolean gui_dialog_key_press_handler(GtkWidget *w, GdkEventKey *ev,
                                             gpointer data)
{
  struct gui_dialog *dlg = data;
 
  if (ev->keyval == GDK_KEY_Escape
        || ((ev->state & GDK_CONTROL_MASK) && ev->keyval == GDK_KEY_w)) {
    /* emit response signal. */
    gui_dialog_response(dlg, GTK_RESPONSE_DELETE_EVENT);
  }
 
  /* propagate event further. */
  return FALSE;
}
 
/**********************************************************************/
static void gui_dialog_switch_page_handler(GtkNotebook *notebook,
                                           GtkWidget *page,
                                           guint num,
                                           struct gui_dialog *dlg)
{
  gint n;
 
  n = gtk_notebook_page_num(GTK_NOTEBOOK(dlg->v.tab.notebook), dlg->vbox);
 
  if (n == num) {
    gtk_widget_override_color(dlg->v.tab.label, GTK_STATE_FLAG_NORMAL, NULL);
  }
}
 
/**********************************************************************/
static void gui_dialog_detach(struct gui_dialog* dlg)
{
  gint n;
  GtkWidget *window, *notebook;
  gulong handler_id;
 
  if (dlg->type != GUI_DIALOG_TAB) {
    return;
  }
  dlg->type = GUI_DIALOG_WINDOW;
  
  /* Create a new reference to the main widget, so it won't be 
   * destroyed in gtk_notebook_remove_page() */
  g_object_ref(dlg->vbox);
 
  /* Remove widget from the notebook */
  notebook = dlg->v.tab.notebook;
  handler_id = dlg->v.tab.handler_id;
  g_signal_handler_disconnect(notebook, handler_id);
 
  n = gtk_notebook_page_num(GTK_NOTEBOOK(dlg->v.tab.notebook), dlg->vbox);
  gtk_notebook_remove_page(GTK_NOTEBOOK(dlg->v.tab.notebook), n);
 
 
  /* Create window and put the widget inside */
  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title(GTK_WINDOW(window), dlg->title);
  setup_dialog(window, toplevel);
 
  gtk_container_add(GTK_CONTAINER(window), dlg->vbox);
  dlg->v.window = window;
  g_signal_connect(window, "delete_event",
    G_CALLBACK(gui_dialog_delete_handler), dlg);
        
  gtk_window_set_default_size(GTK_WINDOW(dlg->v.window),
                              dlg->default_width,
                              dlg->default_height);    
  gtk_widget_show_all(window);
}
 
/**********************************************************************/
static gboolean click_on_tab_callback(GtkWidget* w,
                                     GdkEventButton* button,
                                     gpointer data)
{
  if (button->type != GDK_2BUTTON_PRESS) {
    return FALSE;
  }
  if (button->button != 1) {
    return FALSE;
  }
  gui_dialog_detach((struct gui_dialog*) data);
  return TRUE;
}
 
 
/**********************************************************************/
void gui_dialog_new(struct gui_dialog **pdlg, GtkNotebook *notebook,
                    gpointer user_data, bool check_top)
{
  struct gui_dialog *dlg;
  GtkWidget *vbox, *action_area;
  static int dialog_id_counter;
 
  dlg = fc_malloc(sizeof(*dlg));
  dialog_list = g_list_prepend(dialog_list, dlg);
 
  dlg->source = pdlg;
  *pdlg = dlg;
  dlg->user_data = user_data;
  dlg->title = NULL;
  
  dlg->default_width = 200;
  dlg->default_height = 300;
 
  if (GUI_GTK_OPTION(enable_tabs)) {
    dlg->type = GUI_DIALOG_TAB;
  } else {
    dlg->type = GUI_DIALOG_WINDOW;
  }
 
  if (!gui_action) {
    gui_action = gtk_size_group_new(GTK_SIZE_GROUP_VERTICAL);
  }
  dlg->gui_button = gtk_size_group_new(GTK_SIZE_GROUP_BOTH);
 
  vbox = gtk_grid_new();
  action_area = gtk_grid_new();
  gtk_grid_set_row_spacing(GTK_GRID(action_area), 4);
  gtk_grid_set_column_spacing(GTK_GRID(action_area), 4);
  if (GUI_GTK_OPTION(enable_tabs)
      && (check_top && notebook != GTK_NOTEBOOK(top_notebook))
      && !GUI_GTK_OPTION(small_display_layout)) {
    /* We expect this to be short (as opposed to tall); maximise usable
     * height by putting buttons down the right hand side */
    gtk_orientable_set_orientation(GTK_ORIENTABLE(action_area),
                                   GTK_ORIENTATION_VERTICAL);
  } else {
    /* We expect this to be reasonably tall; maximise usable width by
     * putting buttons along the bottom */
    gtk_orientable_set_orientation(GTK_ORIENTABLE(vbox),
                                   GTK_ORIENTATION_VERTICAL);
  }
 
  gtk_widget_show(vbox);
  gtk_container_add(GTK_CONTAINER(vbox), action_area);
  gtk_widget_show(action_area);
 
  gtk_container_set_border_width(GTK_CONTAINER(vbox), 2);
  gtk_container_set_border_width(GTK_CONTAINER(action_area), 2);
 
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    {
      GtkWidget *window;
 
      window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
      gtk_widget_set_name(window, "Freeciv");
      gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_MOUSE);
      setup_dialog(window, toplevel);
 
      gtk_container_add(GTK_CONTAINER(window), vbox);
      dlg->v.window = window;
      g_signal_connect(window, "delete_event",
        G_CALLBACK(gui_dialog_delete_handler), dlg);
 
    }
    break;
  case GUI_DIALOG_TAB:
    {
      GtkWidget *hbox, *label, *image, *button, *event_box;
      gchar *buf;
 
      hbox = gtk_grid_new();
 
      label = gtk_label_new(NULL);
      gtk_widget_set_halign(label, GTK_ALIGN_START);
      gtk_widget_set_valign(label, GTK_ALIGN_CENTER);
      gtk_widget_set_margin_left(label, 4);
      gtk_widget_set_margin_right(label, 4);
      gtk_widget_set_margin_top(label, 0);
      gtk_widget_set_margin_bottom(label, 0);
      gtk_container_add(GTK_CONTAINER(hbox), label);
 
      button = gtk_button_new();
      gtk_button_set_relief(GTK_BUTTON(button), GTK_RELIEF_NONE);
      g_signal_connect_swapped(button, "clicked",
                               G_CALLBACK(gui_dialog_delete_tab_handler), dlg);
 
      buf = g_strdup_printf(_("Close Tab:\n%s"), _("Ctrl+W"));
      gtk_widget_set_tooltip_text(button, buf);
      g_free(buf);
 
      image = gtk_image_new_from_stock(GTK_STOCK_CLOSE, GTK_ICON_SIZE_MENU);
      gtk_widget_set_margin_left(image, 0);
      gtk_widget_set_margin_right(image, 0);
      gtk_widget_set_margin_top(image, 0);
      gtk_widget_set_margin_bottom(image, 0);
      gtk_button_set_image(GTK_BUTTON(button), image);
 
      gtk_container_add(GTK_CONTAINER(hbox), button);
 
      gtk_widget_show_all(hbox);
 
      event_box = gtk_event_box_new();
      gtk_event_box_set_visible_window(GTK_EVENT_BOX(event_box), FALSE);
      gtk_container_add(GTK_CONTAINER(event_box), hbox);
 
      gtk_notebook_append_page(GTK_NOTEBOOK(notebook), vbox, event_box);
      dlg->v.tab.handler_id =
        g_signal_connect(notebook, "switch-page",
                         G_CALLBACK(gui_dialog_switch_page_handler), dlg);
      dlg->v.tab.child = vbox;
 
      dlg->v.tab.label = label;
      dlg->v.tab.notebook = GTK_WIDGET(notebook);
 
      gtk_widget_add_events(event_box, GDK_BUTTON2_MOTION_MASK);
      g_signal_connect(event_box, "button-press-event",
                       G_CALLBACK(click_on_tab_callback), dlg);
    }
    break;
  }
 
  dlg->vbox = vbox;
  dlg->action_area = action_area;
 
  dlg->response_callback = gui_dialog_destroyed;
  
  dlg->id = dialog_id_counter;
  dialog_id_counter++;
  dlg->return_dialog_id = -1;
 
  g_signal_connect(vbox, "destroy",
      G_CALLBACK(gui_dialog_destroy_handler), dlg);
  g_signal_connect(vbox, "key_press_event",
      G_CALLBACK(gui_dialog_key_press_handler), dlg);
 
  g_object_set_data(G_OBJECT(vbox), "gui-dialog-data", dlg);
}
 
/**********************************************************************/
static void action_widget_activated(GtkWidget *button, GtkWidget *vbox)
{
  struct gui_dialog *dlg =
    g_object_get_data(G_OBJECT(vbox), "gui-dialog-data");
  gpointer arg2 =
    g_object_get_data(G_OBJECT(button), "gui-dialog-response-data");
 
  gui_dialog_response(dlg, GPOINTER_TO_INT(arg2));
}
 
/**********************************************************************/
static void gui_dialog_pack_button(struct gui_dialog *dlg, GtkWidget *button,
                                   int response)
{
  gint signal_id;
 
  fc_assert_ret(GTK_IS_BUTTON(button));
 
  g_object_set_data(G_OBJECT(button), "gui-dialog-response-data",
      GINT_TO_POINTER(response));
 
  if ((signal_id = g_signal_lookup("clicked", GTK_TYPE_BUTTON))) {
    GClosure *closure;
 
    closure = g_cclosure_new_object(G_CALLBACK(action_widget_activated),
        G_OBJECT(dlg->vbox));
    g_signal_connect_closure_by_id(button, signal_id, 0, closure, FALSE);
  }
 
  gtk_container_add(GTK_CONTAINER(dlg->action_area), button);
  gtk_size_group_add_widget(gui_action, button);
  gtk_size_group_add_widget(dlg->gui_button, button);
}
 
/**********************************************************************/
GtkWidget *gui_dialog_add_stockbutton(struct gui_dialog *dlg,
                                      const char *stock,
                                      const char *text, int response)
{
  GtkWidget *button;
 
  button = gtk_stockbutton_new(stock, text);
  gtk_widget_set_can_default(button, TRUE);
  gui_dialog_pack_button(dlg, button, response);
 
  return button;
}
 
/**********************************************************************/
GtkWidget *gui_dialog_add_button(struct gui_dialog *dlg,
                                 const char *text, int response)
{
  GtkWidget *button;
 
  button = gtk_button_new_from_stock(text);
  gtk_widget_set_can_default(button, TRUE);
  gui_dialog_pack_button(dlg, button, response);
 
  return button;
}
 
/**********************************************************************/
GtkWidget *gui_dialog_add_widget(struct gui_dialog *dlg,
                                 GtkWidget *widget)
{
  gtk_container_add(GTK_CONTAINER(dlg->action_area), widget);
  gtk_size_group_add_widget(gui_action, widget);
 
  return widget;
}
 
/**********************************************************************/
void gui_dialog_set_default_response(struct gui_dialog *dlg, int response)
{
  GList *children;
  GList *list;
 
  children = gtk_container_get_children(GTK_CONTAINER(dlg->action_area));
 
  for (list = children; list; list = g_list_next(list)) {
    GtkWidget *button = list->data;
 
    if (GTK_IS_BUTTON(button)) {
      gpointer data = g_object_get_data(G_OBJECT(button),
          "gui-dialog-response-data");
 
      if (response == GPOINTER_TO_INT(data)) {
        gtk_widget_grab_default(button);
      }
    }
  }
 
  g_list_free(children);
}
 
/**********************************************************************/
void gui_dialog_set_response_sensitive(struct gui_dialog *dlg,
                                       int response, bool setting)
{
  GList *children;
  GList *list;
 
  children = gtk_container_get_children(GTK_CONTAINER(dlg->action_area));
 
  for (list = children; list; list = g_list_next(list)) {
    GtkWidget *button = list->data;
 
    if (GTK_IS_BUTTON(button)) {
      gpointer data = g_object_get_data(G_OBJECT(button),
          "gui-dialog-response-data");
 
      if (response == GPOINTER_TO_INT(data)) {
        gtk_widget_set_sensitive(button, setting);
      }
    }
  }
 
  g_list_free(children);
}
 
/**********************************************************************/
GtkWidget *gui_dialog_get_toplevel(struct gui_dialog *dlg)
{
  return gtk_widget_get_toplevel(dlg->vbox);
}
 
/**********************************************************************/
void gui_dialog_show_all(struct gui_dialog *dlg)
{
  gtk_widget_show_all(dlg->vbox);
 
  if (dlg->type == GUI_DIALOG_TAB) {
    GList *children;
    GList *list;
    gint num_visible = 0;
 
    children = gtk_container_get_children(GTK_CONTAINER(dlg->action_area));
 
    for (list = children; list; list = g_list_next(list)) {
      GtkWidget *button = list->data;
 
      if (!GTK_IS_BUTTON(button)) {
        num_visible++;
      } else {
        gpointer data = g_object_get_data(G_OBJECT(button),
            "gui-dialog-response-data");
        int response = GPOINTER_TO_INT(data);
 
        if (response != GTK_RESPONSE_CLOSE
            && response != GTK_RESPONSE_CANCEL) {
          num_visible++;
        } else {
          gtk_widget_hide(button);
        }
      }
    }
    g_list_free(children);
 
    if (num_visible == 0) {
      gtk_widget_hide(dlg->action_area);
    }
  }
}
 
/**********************************************************************/
void gui_dialog_present(struct gui_dialog *dlg)
{
  fc_assert_ret(NULL != dlg);
 
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    gtk_widget_show(dlg->v.window);
    break;
  case GUI_DIALOG_TAB:
    {
      GtkNotebook *notebook = GTK_NOTEBOOK(dlg->v.tab.notebook);
      gint current, n;
 
      current = gtk_notebook_get_current_page(notebook);
      n = gtk_notebook_page_num(notebook, dlg->vbox);
 
      if (current != n) {
        GtkWidget *label = dlg->v.tab.label;
        GdkRGBA color = {.red = 1.0, .green = 0, .blue = 0, .alpha = 1.0};
 
        gtk_widget_override_color(label, GTK_STATE_FLAG_NORMAL, &color);
      }
    }
    break;
  }
}
 
/**********************************************************************/
void gui_dialog_raise(struct gui_dialog *dlg)
{
  fc_assert_ret(NULL != dlg);
 
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    gtk_window_present(GTK_WINDOW(dlg->v.window));
    break;
  case GUI_DIALOG_TAB:
    {
      GtkNotebook *notebook = GTK_NOTEBOOK(dlg->v.tab.notebook);
      gint n;
 
      n = gtk_notebook_page_num(notebook, dlg->vbox);
      gtk_notebook_set_current_page(notebook, n);
    }
    break;
  }
}
 
/**********************************************************************/
void gui_dialog_alert(struct gui_dialog *dlg)
{
  fc_assert_ret(NULL != dlg);
 
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    break;
  case GUI_DIALOG_TAB:
    {
      GtkNotebook *notebook = GTK_NOTEBOOK(dlg->v.tab.notebook);
      gint current, n;
 
      current = gtk_notebook_get_current_page(notebook);
      n = gtk_notebook_page_num(notebook, dlg->vbox);
 
      if (current != n) {
        GtkWidget *label = dlg->v.tab.label;
        GdkRGBA color = {.red = 0, .green = 0, .blue =1.0, .alpha = 1.0};
 
        gtk_widget_override_color(label, GTK_STATE_FLAG_NORMAL, &color);
      }
    }
    break;
  }
}
 
/**********************************************************************/
void gui_dialog_set_default_size(struct gui_dialog *dlg, int width, int height)
{
  dlg->default_width = width;
  dlg->default_height = height;
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    gtk_window_set_default_size(GTK_WINDOW(dlg->v.window), width, height);
    break;
  case GUI_DIALOG_TAB:
    break;
  }
}
 
/**********************************************************************/
void gui_dialog_set_title(struct gui_dialog *dlg, const char *title)
{
  if (dlg->title) {
    free(dlg->title);
  }
  dlg->title = fc_strdup(title);
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    gtk_window_set_title(GTK_WINDOW(dlg->v.window), title);
    break;
  case GUI_DIALOG_TAB:
    gtk_label_set_text_with_mnemonic(GTK_LABEL(dlg->v.tab.label), title);
    break;
  }
}
 
/**********************************************************************/
void gui_dialog_destroy(struct gui_dialog *dlg)
{
  switch (dlg->type) {
  case GUI_DIALOG_WINDOW:
    gtk_widget_destroy(dlg->v.window);
    break;
  case GUI_DIALOG_TAB:
    {
      gint n;
 
      n = gtk_notebook_page_num(GTK_NOTEBOOK(dlg->v.tab.notebook), dlg->vbox);
      gtk_notebook_remove_page(GTK_NOTEBOOK(dlg->v.tab.notebook), n);
    }
    break;
  }
}
 
/**********************************************************************/
void gui_dialog_destroy_all(void)
{
  GList *it, *it_next;
 
  for (it = dialog_list; it; it = it_next) {
    it_next = g_list_next(it);
 
    gui_dialog_destroy((struct gui_dialog *)it->data);
  }
}
 
/**********************************************************************/
void gui_dialog_response_set_callback(struct gui_dialog *dlg,
    GUI_DIALOG_RESPONSE_FUN fun)
{
  dlg->response_callback = fun;
}
 
/**********************************************************************/
void gui_dialog_set_return_dialog(struct gui_dialog *dlg,
                                  struct gui_dialog *return_dialog)
{
  if (return_dialog == NULL) {
    dlg->return_dialog_id = -1;
  } else {
    dlg->return_dialog_id = return_dialog->id;
  }
}
 
/**********************************************************************/
void gui_update_font(const char *font_name, const char *font_value)
{
  char *str;
  GtkCssProvider *provider;
  PangoFontDescription *desc;
  int size;
  const char *fam;
  const char *style;
  const char *weight;
 
  desc = pango_font_description_from_string(font_value);
 
  if (desc == NULL) {
    return;
  }
 
  fam = pango_font_description_get_family(desc);
 
  if (fam == NULL) {
    return;
  }
 
  if (pango_font_description_get_style(desc) == PANGO_STYLE_ITALIC) {
    style = "\n font-style: italic;";
  } else {
    style = "";
  }
 
  if (pango_font_description_get_weight(desc) >= 700) {
    weight = "\n font-weight: bold;";
  } else {
    weight = "";
  }
 
  size = pango_font_description_get_size(desc);
 
  if (size != 0) {
    if (pango_font_description_get_size_is_absolute(desc)) {
      str = g_strdup_printf("#Freeciv #%s { font-family: %s; font-size: %dpx;%s%s}",
                            font_name, fam, size / PANGO_SCALE, style, weight);
    } else {
      str = g_strdup_printf("#Freeciv #%s { font-family: %s; font-size: %dpt;%s%s}",
                            font_name, fam, size / PANGO_SCALE, style, weight);
    }
  } else {
    str = g_strdup_printf("#Freeciv #%s { font-family: %s;%s%s}",
                          font_name, fam, style, weight);
  }
 
  pango_font_description_free(desc);
 
  provider = gtk_css_provider_new();
  gtk_css_provider_load_from_data(GTK_CSS_PROVIDER(provider),
    str, -1, NULL);
  gtk_style_context_add_provider_for_screen(
    gtk_widget_get_screen(toplevel), GTK_STYLE_PROVIDER(provider),
    GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
  g_free(str);
}
 
/**********************************************************************/
void gui_update_font_full(const char *font_name, const char *font_value,
                          PangoFontDescription **font_desc)
{
  PangoFontDescription *f_desc;
 
  gui_update_font(font_name, font_value);
 
  f_desc = pango_font_description_from_string(font_value);
  pango_font_description_free(*font_desc);
 
  *font_desc = f_desc;
}
 
/**********************************************************************/
void disable_gobject_callback(GObject *obj, GCallback cb)
{
  gulong hid;
 
  if (!obj || !cb) {
    return;
  }
 
  hid = g_signal_handler_find(obj, G_SIGNAL_MATCH_FUNC,
                              0, 0, NULL, cb, NULL);
  g_signal_handler_block(obj, hid);
}
 
/**********************************************************************/
void enable_gobject_callback(GObject *obj, GCallback cb)
{
  gulong hid;
 
  if (!obj || !cb) {
    return;
  }
 
  hid = g_signal_handler_find(obj, G_SIGNAL_MATCH_FUNC,
                              0, 0, NULL, cb, NULL);
  g_signal_handler_unblock(obj, hid);
}
 
/**********************************************************************/
GtkTreeViewColumn *add_treeview_column(GtkWidget *view, const char *title,
                                       GType gtype, int model_index)
{
  GtkTreeViewColumn *col;
  GtkCellRenderer *rend;
  const char *attr;
 
  fc_assert_ret_val(view != NULL, NULL);
  fc_assert_ret_val(GTK_IS_TREE_VIEW(view), NULL);
  fc_assert_ret_val(title != NULL, NULL);
 
  if (gtype == G_TYPE_BOOLEAN) {
    rend = gtk_cell_renderer_toggle_new();
    attr = "active";
  } else if (gtype == GDK_TYPE_PIXBUF) {
    rend = gtk_cell_renderer_pixbuf_new();
    attr = "pixbuf";
  } else {
    rend = gtk_cell_renderer_text_new();
    attr = "text";
  }
 
  col = gtk_tree_view_column_new_with_attributes(title, rend, attr,
                                                 model_index, NULL);
  gtk_tree_view_append_column(GTK_TREE_VIEW(view), col);
  return col;
}