moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 345 insertions, 0 deletions

diff --git a/libcaja-private/caja-undo-signal-handlers.c b/libcaja-private/caja-undo-signal-handlers.c
new file mode 100644
index 00000000..04d5360e
--- /dev/null
+++ b/libcaja-private/caja-undo-signal-handlers.c
@@ -0,0 +1,345 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+
+/* Signal handlers to enable undo in Gtk Widgets.
+ *
+ * Copyright (C) 2000 Eazel, Inc.
+ *
+ * Author: Gene Z. Ragan <[email protected]>
+ *
+ * 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 <gtk/gtk.h>
+
+#include <glib/gi18n.h>
+#include <libcaja-private/caja-undo.h>
+
+#include <eel/eel-gtk-macros.h>
+#include <string.h>
+
+#include "caja-undo-signal-handlers.h"
+
+
+typedef struct
+{
+    char *undo_text;
+    gint position;
+    guint selection_start;
+    guint selection_end;
+} EditableUndoData;
+
+typedef struct
+{
+    gboolean undo_registered;
+} EditableUndoObjectData;
+
+
+static void restore_editable_from_undo_snapshot_callback (GObject 	*target,
+        gpointer 	callback_data);
+static void editable_register_edit_undo 		 (GtkEditable 	*editable);
+static void free_editable_object_data 			 (gpointer 	data);
+
+/* caja_undo_set_up_caja_entry_for_undo
+ *
+ * Functions and callback methods to handle undo
+ * in a CajaEntry
+ */
+
+static void
+caja_entry_user_changed_callback (CajaEntry *entry)
+{
+    /* Register undo transaction */
+    editable_register_edit_undo (GTK_EDITABLE (entry));
+}
+
+void
+caja_undo_set_up_caja_entry_for_undo (CajaEntry *entry)
+{
+    EditableUndoObjectData *data;
+
+    if (!CAJA_IS_ENTRY (entry) )
+    {
+        return;
+    }
+
+    data = g_new(EditableUndoObjectData, 1);
+    data->undo_registered = FALSE;
+    g_object_set_data_full (G_OBJECT (entry), "undo_registered",
+                            data, free_editable_object_data);
+
+    /* Connect to entry signals */
+    g_signal_connect (entry, "user_changed",
+                      G_CALLBACK (caja_entry_user_changed_callback),
+                      NULL);
+}
+
+void
+caja_undo_tear_down_caja_entry_for_undo (CajaEntry *entry)
+{
+    if (!CAJA_IS_ENTRY (entry) )
+    {
+        return;
+    }
+
+    /* Disconnect from entry signals */
+    g_signal_handlers_disconnect_by_func
+    (entry, G_CALLBACK (caja_entry_user_changed_callback), NULL);
+
+}
+
+/* caja_undo_set_up_caja_entry_for_undo
+ *
+ * Functions and callback methods to handle undo
+ * in a CajaEntry
+ */
+
+static void
+free_editable_undo_data (gpointer data)
+{
+    EditableUndoData *undo_data;
+
+    undo_data = (EditableUndoData *) data;
+
+    g_free (undo_data->undo_text);
+    g_free (undo_data);
+}
+
+static void
+free_editable_object_data (gpointer data)
+{
+    g_free (data);
+}
+
+
+static void
+editable_insert_text_callback (GtkEditable *editable)
+{
+    /* Register undo transaction */
+    editable_register_edit_undo (editable);
+}
+
+static void
+editable_delete_text_callback (GtkEditable *editable)
+{
+    /* Register undo transaction */
+    editable_register_edit_undo (editable);
+}
+
+static void
+editable_register_edit_undo (GtkEditable *editable)
+{
+    EditableUndoData *undo_data;
+    EditableUndoObjectData *undo_info;
+    gpointer data;
+
+    if (!GTK_IS_EDITABLE (editable) )
+    {
+        return;
+    }
+
+    /* Check our undo registered flag */
+    data = g_object_get_data (G_OBJECT (editable), "undo_registered");
+    if (data == NULL)
+    {
+        g_warning ("Undo data is NULL");
+        return;
+    }
+
+    undo_info = (EditableUndoObjectData *)data;
+    if (undo_info->undo_registered)
+    {
+        return;
+    }
+
+    undo_data = g_new0 (EditableUndoData, 1);
+    undo_data->undo_text = gtk_editable_get_chars (editable, 0, -1);
+    undo_data->position = gtk_editable_get_position (editable);
+    gtk_editable_get_selection_bounds (editable,
+                                       &undo_data->selection_start,
+                                       &undo_data->selection_end);
+
+    caja_undo_register
+    (G_OBJECT (editable),
+     restore_editable_from_undo_snapshot_callback,
+     undo_data,
+     (GDestroyNotify) free_editable_undo_data,
+     _("Edit"),
+     _("Undo Edit"),
+     _("Undo the edit"),
+     _("Redo Edit"),
+     _("Redo the edit"));
+
+    undo_info->undo_registered = TRUE;
+}
+
+void
+caja_undo_set_up_editable_for_undo (GtkEditable *editable)
+{
+    EditableUndoObjectData *data;
+
+    if (!GTK_IS_EDITABLE (editable) )
+    {
+        return;
+    }
+
+    /* Connect to editable signals */
+    g_signal_connect (editable, "insert_text",
+                      G_CALLBACK (editable_insert_text_callback), NULL);
+    g_signal_connect (editable, "delete_text",
+                      G_CALLBACK (editable_delete_text_callback), NULL);
+
+
+    data = g_new (EditableUndoObjectData, 1);
+    data->undo_registered = FALSE;
+    g_object_set_data_full (G_OBJECT (editable), "undo_registered",
+                            data, free_editable_object_data);
+}
+
+void
+caja_undo_tear_down_editable_for_undo (GtkEditable *editable)
+{
+    if (!GTK_IS_EDITABLE (editable) )
+    {
+        return;
+    }
+
+    /* Disconnect from entry signals */
+    g_signal_handlers_disconnect_by_func
+    (editable, G_CALLBACK (editable_insert_text_callback), NULL);
+    g_signal_handlers_disconnect_by_func
+    (editable, G_CALLBACK (editable_delete_text_callback), NULL);
+}
+
+/* restore_editable_from_undo_snapshot_callback
+ *
+ * Restore edited text.
+ */
+static void
+restore_editable_from_undo_snapshot_callback (GObject *target, gpointer callback_data)
+{
+    GtkEditable *editable;
+    GtkWindow *window;
+    EditableUndoData *undo_data;
+    EditableUndoObjectData *data;
+    gint position;
+
+    editable = GTK_EDITABLE (target);
+    undo_data = (EditableUndoData *) callback_data;
+
+    /* Check our undo registered flag */
+    data = g_object_get_data (target, "undo_registered");
+    if (data == NULL)
+    {
+        g_warning ("Undo regisetred flag not found");
+        return;
+    }
+
+    /* Reset the registered flag so we get a new item for future editing. */
+    data->undo_registered = FALSE;
+
+    /* Register a new undo transaction for redo. */
+    editable_register_edit_undo (editable);
+
+    /* Restore the text. */
+    position = 0;
+    gtk_editable_delete_text (editable, 0, -1);
+    gtk_editable_insert_text (editable, undo_data->undo_text,
+                              strlen (undo_data->undo_text), &position);
+
+    /* Set focus to widget */
+    window = GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (target)));
+    gtk_window_set_focus (window, GTK_WIDGET (editable));
+
+    /* We have to do this call, because the previous call selects all text */
+    gtk_editable_select_region (editable, 0, 0);
+
+    /* Restore selection */
+    gtk_editable_select_region (editable, undo_data->selection_start,
+                                undo_data->selection_end);
+
+    /* Set the i-beam to the saved position */
+    gtk_editable_set_position (editable, undo_data->position);
+
+    /* Reset the registered flag so we get a new item for future editing. */
+    data->undo_registered = FALSE;
+}
+
+
+/* editable_set_undo_key
+ *
+ * Allow the use of ctrl-z from within widget.
+ */
+
+/* Undo is disabled until we have a better implementation.
+ * Both here and in caja-shell-ui.xml.
+ */
+
+/* FIXME bugzilla.gnome.org 43515: Undo doesn't work */
+#ifdef UNDO_ENABLED
+
+static gboolean
+editable_key_press_event (GtkEditable *editable, GdkEventKey *event, gpointer user_data)
+{
+    switch (event->keyval)
+    {
+        /* Undo */
+    case 'z':
+        if ((event->state & GDK_CONTROL_MASK) != 0)
+        {
+            caja_undo (GTK_OBJECT (editable));
+            return TRUE;
+        }
+        break;
+
+    default:
+        break;
+    }
+
+    return FALSE;
+}
+
+#endif
+
+/* editable_set_undo_key
+ *
+ * Allow the use of ctrl-z from within widget.  This should only be
+ * set if there is no menu bar to use to undo the widget.
+ */
+
+void
+caja_undo_editable_set_undo_key (GtkEditable *editable, gboolean value)
+{
+    /* FIXME bugzilla.gnome.org 43515: Undo doesn't work */
+#ifdef UNDO_ENABLED
+    if (value)
+    {
+        /* Connect to entry signals */
+        g_signal_connect (editable, "key_press_event",
+                          G_CALLBACK (editable_key_press_event), NULL);
+    }
+    else
+    {
+        /* FIXME bugzilla.gnome.org 45092: Warns if the handler
+         * is not already connected. We could use object data
+         * to prevent that little problem.
+         */
+        g_signal_disconnect_by_func (editable,
+                                     G_CALLBACK (editable_key_press_event), NULL);
+    }
+#endif
+}