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diff --git a/ui/gtk/filter_dlg.h b/ui/gtk/filter_dlg.h
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+/* filter_dlg.h
+ * Definitions for dialog boxes for filter editing
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef __FILTER_DLG_H__
+#define __FILTER_DLG_H__
+
+/** @file
+ * "Capture Filter" / "Display Filter" / "Add expression" dialog boxes.
+ * (This used to be a notebook page under "Preferences", hence the
+ * "prefs" in the file name.)
+ * @ingroup dialog_group
+ */
+
+/**
+ * Structure giving properties of the filter editing dialog box to be
+ * created.
+ */
+typedef struct {
+    const gchar    *title;          /**< title of dialog box */
+    gboolean wants_apply_button;    /**< dialog should have an Apply button */
+    gboolean activate_on_ok;        /**< if parent text widget should be
+                                        activated on "Ok" or "Apply" */
+    gboolean modal_and_transient;   /**< dialog is modal and transient to the
+                                        parent window (e.g. to gtk_file_chooser) */
+} construct_args_t;
+
+/** Create a "Capture Filter" dialog box caused by a button click.
+ *
+ * @param widget parent widget
+ * @param user_data unused
+ */
+void capture_filter_construct_cb(GtkWidget *widget, gpointer user_data);
+
+/** Create a "Display Filter" dialog box caused by a button click.
+ *
+ * @param widget parent widget
+ * @param construct_args_ptr parameters to construct the dialog (construct_args_t)
+ */
+void display_filter_construct_cb(GtkWidget *widget, gpointer construct_args_ptr);
+
+/** Should be called when the widget (usually a button) that creates filters
+ *  is destroyed. It destroys any filter dialog created by that widget.
+ *
+ * @param widget parent widget
+ * @param user_data unused
+ */
+void filter_button_destroy_cb(GtkWidget *widget, gpointer user_data);
+
+/** User requested the "Capture Filter" dialog box by menu or toolbar.
+ *
+ * @param widget parent widget
+ */
+void cfilter_dialog_cb(GtkWidget *widget);
+
+/** User requested the "Display Filter" dialog box by menu or toolbar.
+ *
+ * @param widget parent widget
+ */
+void dfilter_dialog_cb(GtkWidget *widget);
+
+/** Create an "Add expression" dialog box caused by a button click.
+ *
+ * @param widget unused
+ * @param main_w_arg parent widget
+ */
+void filter_add_expr_bt_cb(GtkWidget *widget, gpointer main_w_arg);
+
+/** Colorize a text entry as empty.
+ *
+ * @param widget the text entry to colorize
+ */
+void colorize_filter_te_as_empty(GtkWidget *widget);
+
+/** Colorize a text entry as a invalid.
+ *
+ * @param widget the text entry to colorize
+ */
+void colorize_filter_te_as_invalid(GtkWidget *widget);
+
+/** Colorize a text entry as a valid.
+ *
+ * @param widget the text entry to colorize
+ */
+void colorize_filter_te_as_valid(GtkWidget *widget);
+
+/** Colorize a filter text entry depending on "validity".
+ *
+ * @param widget the text entry to colorize
+ * @param user_data Callback User Data pointer (unused)
+ */
+void filter_te_syntax_check_cb(GtkWidget *widget, gpointer user_data _U_);
+
+/** The filter button of the top_level window. */
+#define E_FILT_BT_PTR_KEY	    "filter_bt_ptr"
+
+/** The filter text entry. */
+#define E_FILT_TE_PTR_KEY	    "filter_te_ptr"
+
+/** The filter text entry.
+ *  @todo Check the usage of all the text entry keys.
+ */
+#define E_FILT_FILTER_TE_KEY    "filter_filter_te"
+
+/** Only validate a single field entry. */
+#define E_FILT_FIELD_NAME_ONLY_KEY  "filter_field_name_only"
+
+/** Update statusbar when changing the filter entry. */
+#define E_FILT_FIELD_USE_STATUSBAR_KEY "filter_field_use_statusbar"
+
+#endif /* filter_dlg.h */