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Sourcecode: nautilus version File versions

nautilus-entry.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* NautilusEntry: one-line text editing widget. This consists of bug fixes
 * and other improvements to GtkEntry, and all the changes could be rolled
 * into GtkEntry some day.
 *
 * Copyright (C) 2000 Eazel, Inc.
 *
 * Author: John Sullivan <sullivan@eazel.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <config.h>
#include "nautilus-entry.h"

#include <string.h>
#include "nautilus-global-preferences.h"
#include "nautilus-undo-signal-handlers.h"
#include <eel/eel-gdk-extensions.h>
#include <eel/eel-gtk-macros.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>

struct NautilusEntryDetails {
      gboolean user_edit;
      gboolean special_tab_handling;

      guint select_idle_id;
};

enum {
      USER_CHANGED,
      SELECTION_CHANGED,
      LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];

static void nautilus_entry_editable_init (GtkEditableClass *iface);

G_DEFINE_TYPE_WITH_CODE (NautilusEntry, nautilus_entry, GTK_TYPE_ENTRY,
                   G_IMPLEMENT_INTERFACE (GTK_TYPE_EDITABLE,
                                    nautilus_entry_editable_init));

static GtkEditableClass *parent_editable_interface = NULL;

static void
nautilus_entry_init (NautilusEntry *entry)
{
      GtkWidget *widget;

      widget = GTK_WIDGET (entry);
      entry->details = g_new0 (NautilusEntryDetails, 1);
      
      entry->details->user_edit = TRUE;

      nautilus_undo_set_up_nautilus_entry_for_undo (entry);
}

GtkWidget *
nautilus_entry_new (void)
{
      return gtk_widget_new (NAUTILUS_TYPE_ENTRY, NULL);
}

GtkWidget *
nautilus_entry_new_with_max_length (guint16 max)
{
      GtkWidget *widget;

      widget = gtk_widget_new (NAUTILUS_TYPE_ENTRY, NULL);
      GTK_ENTRY (widget)->text_max_length = max;

      return widget;
}

static void
nautilus_entry_finalize (GObject *object)
{
      NautilusEntry *entry;

      entry = NAUTILUS_ENTRY (object);

      if (entry->details->select_idle_id != 0) {
            g_source_remove (entry->details->select_idle_id);
      }
      
      g_free (entry->details);

      G_OBJECT_CLASS (nautilus_entry_parent_class)->finalize (object);
}

static gboolean
nautilus_entry_key_press (GtkWidget *widget, GdkEventKey *event)
{
      NautilusEntry *entry;
      GtkEditable *editable;
      int position;
      gboolean old_has, new_has;
      gboolean result;
      
      entry = NAUTILUS_ENTRY (widget);
      editable = GTK_EDITABLE (widget);
      
      if (!gtk_editable_get_editable (editable)) {
            return FALSE;
      }

      switch (event->keyval) {
      case GDK_Tab:
            /* The location bar entry wants TAB to work kind of
             * like it does in the shell for command completion,
             * so if we get a tab and there's a selection, we
             * should position the insertion point at the end of
             * the selection.
             */
            if (entry->details->special_tab_handling && gtk_editable_get_selection_bounds (editable, NULL, NULL)) {
                  position = strlen (gtk_entry_get_text (GTK_ENTRY (editable)));
                  gtk_editable_select_region (editable, position, position);
                  return TRUE;
            }
            break;

      default:
            break;
      }
      
      old_has = gtk_editable_get_selection_bounds (editable, NULL, NULL);

      result = GTK_WIDGET_CLASS (nautilus_entry_parent_class)->key_press_event (widget, event);

      /* Pressing a key usually changes the selection if there is a selection.
       * If there is not selection, we can save work by not emitting a signal.
       */
      if (result) {
            new_has = gtk_editable_get_selection_bounds (editable, NULL, NULL);
            if (old_has || new_has) {
                  g_signal_emit (widget, signals[SELECTION_CHANGED], 0);
            }
      }

      return result;
      
}

static gboolean
nautilus_entry_motion_notify (GtkWidget *widget, GdkEventMotion *event)
{
      int result;
      gboolean old_had, new_had;
      int old_start, old_end, new_start, new_end;
      NautilusEntry *entry;
      GtkEditable *editable;

      entry = NAUTILUS_ENTRY (widget);
      editable = GTK_EDITABLE (widget);

      old_had = gtk_editable_get_selection_bounds (editable, &old_start, &old_end);

      result = GTK_WIDGET_CLASS (nautilus_entry_parent_class)->motion_notify_event (widget, event);

      /* Send a signal if dragging the mouse caused the selection to change. */
      if (result) {
            new_had = gtk_editable_get_selection_bounds (editable, &new_start, &new_end);
            if (old_had != new_had || (old_had && (old_start != new_start || old_end != new_end))) {
                  g_signal_emit (widget, signals[SELECTION_CHANGED], 0);
            }
      }
      
      return result;
}

/**
 * nautilus_entry_select_all
 *
 * Select all text, leaving the text cursor position at the end.
 * 
 * @entry: A NautilusEntry
 **/
void
nautilus_entry_select_all (NautilusEntry *entry)
{
      g_return_if_fail (NAUTILUS_IS_ENTRY (entry));

      gtk_editable_set_position (GTK_EDITABLE (entry), -1);
      gtk_editable_select_region (GTK_EDITABLE (entry), 0, -1);
}

static gboolean
select_all_at_idle (gpointer callback_data)
{
      NautilusEntry *entry;

      entry = NAUTILUS_ENTRY (callback_data);

      nautilus_entry_select_all (entry);

      entry->details->select_idle_id = 0;
      
      return FALSE;
}

/**
 * nautilus_entry_select_all_at_idle
 *
 * Select all text at the next idle, not immediately.
 * This is useful when reacting to a key press, because
 * changing the selection and the text cursor position doesn't
 * work in a key_press signal handler.
 * 
 * @entry: A NautilusEntry
 **/
void
nautilus_entry_select_all_at_idle (NautilusEntry *entry)
{
      g_return_if_fail (NAUTILUS_IS_ENTRY (entry));

      /* If the text cursor position changes in this routine
       * then gtk_entry_key_press will unselect (and we want
       * to move the text cursor position to the end).
       */

      if (entry->details->select_idle_id == 0) {
            entry->details->select_idle_id = g_idle_add (select_all_at_idle, entry);
      }
}

/**
 * nautilus_entry_set_text
 *
 * This function wraps gtk_entry_set_text.  It sets undo_registered
 * to TRUE and preserves the old value for a later restore.  This is
 * done so the programmatic changes to the entry do not register
 * with the undo manager.
 *  
 * @entry: A NautilusEntry
 * @test: The text to set
 **/

void
nautilus_entry_set_text (NautilusEntry *entry, const gchar *text)
{
      g_return_if_fail (NAUTILUS_IS_ENTRY (entry));

      entry->details->user_edit = FALSE;
      gtk_entry_set_text (GTK_ENTRY (entry), text);
      entry->details->user_edit = TRUE;
      
      g_signal_emit (entry, signals[SELECTION_CHANGED], 0);
}

static void
nautilus_entry_set_selection_bounds (GtkEditable *editable,
                             int start_pos,
                             int end_pos)
{
      parent_editable_interface->set_selection_bounds (editable, start_pos, end_pos);

      g_signal_emit (editable, signals[SELECTION_CHANGED], 0);
}

static gboolean
nautilus_entry_button_press (GtkWidget *widget,
                       GdkEventButton *event)
{
      gboolean result;

      result = GTK_WIDGET_CLASS (nautilus_entry_parent_class)->button_press_event (widget, event);

      if (result) {
            g_signal_emit (widget, signals[SELECTION_CHANGED], 0);
      }

      return result;
}

static gboolean
nautilus_entry_button_release (GtkWidget *widget,
                         GdkEventButton *event)
{
      gboolean result;

      result = GTK_WIDGET_CLASS (nautilus_entry_parent_class)->button_release_event (widget, event);

      if (result) {
            g_signal_emit (widget, signals[SELECTION_CHANGED], 0);
      }

      return result;
}

static void
nautilus_entry_insert_text (GtkEditable *editable, const gchar *text,
                      int length, int *position)
{
      NautilusEntry *entry;

      entry = NAUTILUS_ENTRY(editable);

      /* Fire off user changed signals */
      if (entry->details->user_edit) {
            g_signal_emit (editable, signals[USER_CHANGED], 0);
      }

      parent_editable_interface->insert_text (editable, text, length, position);

      g_signal_emit (editable, signals[SELECTION_CHANGED], 0);
}
                                   
static void 
nautilus_entry_delete_text (GtkEditable *editable, int start_pos, int end_pos)
{
      NautilusEntry *entry;
      
      entry = NAUTILUS_ENTRY (editable);

      /* Fire off user changed signals */
      if (entry->details->user_edit) {
            g_signal_emit (editable, signals[USER_CHANGED], 0);
      }

      parent_editable_interface->delete_text (editable, start_pos, end_pos);

      g_signal_emit (editable, signals[SELECTION_CHANGED], 0);
}

/* Overridden to work around GTK bug. The selection_clear_event is queued
 * when the selection changes. Changing the selection to NULL and then
 * back to the original selection owner still sends the event, so the
 * selection owner then gets the selection ripped away from it. We ran into
 * this with type-completion behavior in NautilusLocationBar (see bug 5313).
 * There's a FIXME comment that seems to be about this same issue in
 * gtk+/gtkselection.c, gtk_selection_clear.
 */
static gboolean
nautilus_entry_selection_clear (GtkWidget *widget,
                          GdkEventSelection *event)
{
      g_assert (NAUTILUS_IS_ENTRY (widget));
      
      if (gdk_selection_owner_get (event->selection) == widget->window) {
            return FALSE;
      }
      
      return GTK_WIDGET_CLASS (nautilus_entry_parent_class)->selection_clear_event (widget, event);
}

static void
nautilus_entry_editable_init (GtkEditableClass *iface)
{
      parent_editable_interface = g_type_interface_peek_parent (iface);

      iface->insert_text = nautilus_entry_insert_text;
      iface->delete_text = nautilus_entry_delete_text;
      iface->set_selection_bounds = nautilus_entry_set_selection_bounds;

      /* Otherwise we might need some memcpy loving */
      g_assert (iface->do_insert_text != NULL);
      g_assert (iface->get_position != NULL);
      g_assert (iface->get_chars != NULL);
}

static void
nautilus_entry_class_init (NautilusEntryClass *class)
{
      GtkWidgetClass *widget_class;
      GtkObjectClass *object_class;
      GObjectClass *gobject_class;

      widget_class = GTK_WIDGET_CLASS (class);
      gobject_class = G_OBJECT_CLASS (class);
      object_class = GTK_OBJECT_CLASS (class);
            
      widget_class->button_press_event = nautilus_entry_button_press;
      widget_class->button_release_event = nautilus_entry_button_release;
      widget_class->key_press_event = nautilus_entry_key_press;
      widget_class->motion_notify_event = nautilus_entry_motion_notify;
      widget_class->selection_clear_event = nautilus_entry_selection_clear;
      
      gobject_class->finalize = nautilus_entry_finalize;

      /* Set up signals */
      signals[USER_CHANGED] = g_signal_new
            ("user_changed",
             G_TYPE_FROM_CLASS (object_class),
             G_SIGNAL_RUN_LAST,
             G_STRUCT_OFFSET (NautilusEntryClass,
                            user_changed),
             NULL, NULL,
             g_cclosure_marshal_VOID__VOID,
             G_TYPE_NONE, 0);
      signals[SELECTION_CHANGED] = g_signal_new
            ("selection_changed",
             G_TYPE_FROM_CLASS (object_class),
             G_SIGNAL_RUN_LAST,
             G_STRUCT_OFFSET (NautilusEntryClass,
                            selection_changed),
             NULL, NULL,
             g_cclosure_marshal_VOID__VOID,
             G_TYPE_NONE, 0);
}

void
nautilus_entry_set_special_tab_handling (NautilusEntry *entry,
                               gboolean special_tab_handling)
{
      g_return_if_fail (NAUTILUS_IS_ENTRY (entry));

      entry->details->special_tab_handling = special_tab_handling;
}



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