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1 files changed, 459 insertions, 0 deletions

diff --git a/src/eggtreemultidnd.c b/src/eggtreemultidnd.c
new file mode 100644
index 0000000..5bf4698
--- /dev/null
+++ b/src/eggtreemultidnd.c
@@ -0,0 +1,459 @@
+/*
+ * File-Roller
+ *
+ * Copyright (C) 2005 Free Software Foundation, Inc.
+ * Author: Paolo Bacchilega
+ */
+
+/* eggtreemultidnd.c
+ * Copyright (C) 2001  Red Hat, Inc.
+ *
+ * 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 <string.h>
+#include <gtk/gtk.h>
+#include "eggtreemultidnd.h"
+
+#define EGG_TREE_MULTI_DND_STRING "EggTreeMultiDndString"
+
+static GtkTargetEntry target_table[] = {
+        { "XdndDirectSave0", 0, 0 },
+        { "XdndFileRoller0", 0, 1 }
+};
+
+typedef struct
+{
+  guint   pressed_button;
+  gint    x;
+  gint    y;
+  guint   motion_notify_handler;
+  guint   button_release_handler;
+  guint   drag_data_get_handler;
+  GSList *event_list;
+  gboolean pending_event;
+} EggTreeMultiDndData;
+
+
+GType
+egg_tree_multi_drag_source_get_type (void)
+{
+  static GType our_type = 0;
+
+  if (!our_type)
+    {
+      static const GTypeInfo our_info =
+	{
+	  sizeof (EggTreeMultiDragSourceIface), /* class_size */
+	  NULL,		/* base_init */
+	  NULL,		/* base_finalize */
+	  NULL,
+	  NULL,		/* class_finalize */
+	  NULL,		/* class_data */
+	  0,
+	  0,            /* n_preallocs */
+	  NULL
+	};
+
+      our_type = g_type_register_static (G_TYPE_INTERFACE,
+					 "EggTreeMultiDragSource",
+					 &our_info,
+					 0);
+    }
+
+  return our_type;
+}
+
+
+/**
+ * egg_tree_multi_drag_source_row_draggable:
+ * @drag_source: a #EggTreeMultiDragSource
+ * @path: row on which user is initiating a drag
+ *
+ * Asks the #EggTreeMultiDragSource whether a particular row can be used as
+ * the source of a DND operation. If the source doesn't implement
+ * this interface, the row is assumed draggable.
+ *
+ * Return value: %TRUE if the row can be dragged
+ **/
+gboolean
+egg_tree_multi_drag_source_row_draggable (EggTreeMultiDragSource *drag_source,
+					  GList                  *path_list)
+{
+  EggTreeMultiDragSourceIface *iface = EGG_TREE_MULTI_DRAG_SOURCE_GET_IFACE (drag_source);
+
+  g_return_val_if_fail (EGG_IS_TREE_MULTI_DRAG_SOURCE (drag_source), FALSE);
+  g_return_val_if_fail (iface->row_draggable != NULL, FALSE);
+  g_return_val_if_fail (path_list != NULL, FALSE);
+
+  if (iface->row_draggable)
+    return (* iface->row_draggable) (drag_source, path_list);
+  else
+    return TRUE;
+}
+
+
+/**
+ * egg_tree_multi_drag_source_drag_data_delete:
+ * @drag_source: a #EggTreeMultiDragSource
+ * @path: row that was being dragged
+ *
+ * Asks the #EggTreeMultiDragSource to delete the row at @path, because
+ * it was moved somewhere else via drag-and-drop. Returns %FALSE
+ * if the deletion fails because @path no longer exists, or for
+ * some model-specific reason. Should robustly handle a @path no
+ * longer found in the model!
+ *
+ * Return value: %TRUE if the row was successfully deleted
+ **/
+gboolean
+egg_tree_multi_drag_source_drag_data_delete (EggTreeMultiDragSource *drag_source,
+					     GList                  *path_list)
+{
+  EggTreeMultiDragSourceIface *iface = EGG_TREE_MULTI_DRAG_SOURCE_GET_IFACE (drag_source);
+
+  g_return_val_if_fail (EGG_IS_TREE_MULTI_DRAG_SOURCE (drag_source), FALSE);
+  g_return_val_if_fail (iface->drag_data_delete != NULL, FALSE);
+  g_return_val_if_fail (path_list != NULL, FALSE);
+
+  return (* iface->drag_data_delete) (drag_source, path_list);
+}
+
+
+/**
+ * egg_tree_multi_drag_source_drag_data_get:
+ * @drag_source: a #EggTreeMultiDragSource
+ * @path: row that was dragged
+ * @selection_data: a #EggSelectionData to fill with data from the dragged row
+ *
+ * Asks the #EggTreeMultiDragSource to fill in @selection_data with a
+ * representation of the row at @path. @selection_data->target gives
+ * the required type of the data.  Should robustly handle a @path no
+ * longer found in the model!
+ *
+ * Return value: %TRUE if data of the required type was provided
+ **/
+gboolean
+egg_tree_multi_drag_source_drag_data_get (EggTreeMultiDragSource *drag_source,
+					  GdkDragContext         *context,
+					  GtkSelectionData       *selection_data,
+					  GList                  *path_list)
+{
+  EggTreeMultiDragSourceIface *iface = EGG_TREE_MULTI_DRAG_SOURCE_GET_IFACE (drag_source);
+
+  g_return_val_if_fail (EGG_IS_TREE_MULTI_DRAG_SOURCE (drag_source), FALSE);
+  g_return_val_if_fail (iface->drag_data_get != NULL, FALSE);
+  g_return_val_if_fail (path_list != NULL, FALSE);
+  g_return_val_if_fail (selection_data != NULL, FALSE);
+
+  return (* iface->drag_data_get) (drag_source, context, selection_data, path_list);
+}
+
+
+static void
+stop_drag_check (GtkWidget *widget)
+{
+  EggTreeMultiDndData *priv_data;
+  GSList *l;
+
+  priv_data = g_object_get_data (G_OBJECT (widget), EGG_TREE_MULTI_DND_STRING);
+
+  for (l = priv_data->event_list; l != NULL; l = l->next)
+    gdk_event_free (l->data);
+
+  g_slist_free (priv_data->event_list);
+  priv_data->event_list = NULL;
+  priv_data->pending_event = FALSE;
+
+  if (priv_data->motion_notify_handler) {
+    g_signal_handler_disconnect (widget, priv_data->motion_notify_handler);
+    priv_data->motion_notify_handler = 0;
+  }
+  if (priv_data->button_release_handler) {
+    g_signal_handler_disconnect (widget, priv_data->button_release_handler);
+    priv_data->button_release_handler = 0;
+  }
+}
+
+
+static gboolean
+egg_tree_multi_drag_button_release_event (GtkWidget      *widget,
+					  GdkEventButton *event,
+					  gpointer        data)
+{
+  EggTreeMultiDndData *priv_data;
+  GSList *l;
+
+  priv_data = g_object_get_data (G_OBJECT (widget), EGG_TREE_MULTI_DND_STRING);
+
+  for (l = priv_data->event_list; l != NULL; l = l->next)
+    gtk_propagate_event (widget, l->data);
+
+  stop_drag_check (widget);
+
+  return FALSE;
+}
+
+
+static void
+selection_foreach (GtkTreeModel *model,
+		   GtkTreePath  *path,
+		   GtkTreeIter  *iter,
+		   gpointer      data)
+{
+  GList **list_ptr;
+
+  list_ptr = (GList **) data;
+
+  *list_ptr = g_list_prepend (*list_ptr, gtk_tree_row_reference_new (model, path));
+}
+
+
+static void
+path_list_free (GList *path_list)
+{
+  g_list_foreach (path_list, (GFunc) gtk_tree_row_reference_free, NULL);
+  g_list_free (path_list);
+}
+
+
+static void
+set_context_data (GdkDragContext *context,
+		  GList          *path_list)
+{
+  g_object_set_data_full (G_OBJECT (context),
+                          "egg-tree-view-multi-source-row",
+                          path_list,
+                          (GDestroyNotify) path_list_free);
+}
+
+
+static GList *
+get_context_data (GdkDragContext *context)
+{
+  return g_object_get_data (G_OBJECT (context),
+			    "egg-tree-view-multi-source-row");
+}
+
+
+static gboolean
+egg_tree_multi_drag_drag_data_get (GtkWidget        *widget,
+				   GdkDragContext   *context,
+				   GtkSelectionData *selection_data,
+				   guint             info,
+				   guint             time)
+{
+  GtkTreeView  *tree_view;
+  GtkTreeModel *model;
+  GList        *path_list;
+
+  tree_view = GTK_TREE_VIEW (widget);
+  model = gtk_tree_view_get_model (tree_view);
+  if (model == NULL)
+    return FALSE;
+
+  path_list = get_context_data (context);
+  if (path_list == NULL)
+    return FALSE;
+
+  /* We can implement the GTK_TREE_MODEL_ROW target generically for
+   * any model; for DragSource models there are some other targets
+   * we also support.
+   */
+
+  if (! EGG_IS_TREE_MULTI_DRAG_SOURCE (model))
+    return FALSE;
+
+  return egg_tree_multi_drag_source_drag_data_get (EGG_TREE_MULTI_DRAG_SOURCE (model),
+      						   context,
+						   selection_data,
+						   path_list);
+}
+
+
+static gboolean
+egg_tree_multi_drag_motion_event (GtkWidget      *widget,
+				  GdkEventMotion *event,
+				  gpointer        data)
+{
+  EggTreeMultiDndData *priv_data;
+
+  priv_data = g_object_get_data (G_OBJECT (widget), EGG_TREE_MULTI_DND_STRING);
+
+  if (gtk_drag_check_threshold (widget,
+				priv_data->x,
+				priv_data->y,
+				event->x,
+				event->y))
+    {
+      GList            *path_list = NULL;
+      GtkTreeSelection *selection;
+      GtkTreeModel     *model;
+      GdkDragContext   *context;
+
+      stop_drag_check (widget);
+
+      selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (widget));
+      gtk_tree_selection_selected_foreach (selection, selection_foreach, &path_list);
+      if (path_list == NULL)
+	      return FALSE;
+
+      path_list = g_list_reverse (path_list);
+
+      model = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));
+      if (egg_tree_multi_drag_source_row_draggable (EGG_TREE_MULTI_DRAG_SOURCE (model), path_list))
+	{
+	  GtkTargetList *target_list = gtk_target_list_new (target_table,
+							    G_N_ELEMENTS (target_table));
+
+	  context = gtk_drag_begin (widget,
+				    target_list,
+				    GDK_ACTION_COPY,
+				    priv_data->pressed_button,
+				    (GdkEvent*)event);
+	  set_context_data (context, path_list);
+	  gtk_drag_set_icon_default (context);
+
+	  gtk_target_list_unref (target_list);
+	}
+      else
+	{
+	  path_list_free (path_list);
+	}
+    }
+
+  return TRUE;
+}
+
+
+static gboolean
+egg_tree_multi_drag_button_press_event (GtkWidget      *widget,
+					GdkEventButton *event,
+					gpointer        data)
+{
+  GtkTreeView         *tree_view;
+  GtkTreePath         *path = NULL;
+  GtkTreeViewColumn   *column = NULL;
+  gint                 cell_x, cell_y;
+  GtkTreeSelection    *selection;
+  EggTreeMultiDndData *priv_data;
+
+  if (event->window != gtk_tree_view_get_bin_window (GTK_TREE_VIEW (widget)))
+    return FALSE;
+
+  if (event->button == 3)
+    return FALSE;
+
+  tree_view = GTK_TREE_VIEW (widget);
+  priv_data = g_object_get_data (G_OBJECT (tree_view), EGG_TREE_MULTI_DND_STRING);
+  if (priv_data == NULL)
+    {
+      priv_data = g_new0 (EggTreeMultiDndData, 1);
+      priv_data->pending_event = FALSE;
+      g_object_set_data (G_OBJECT (tree_view),
+			 EGG_TREE_MULTI_DND_STRING,
+			 priv_data);
+    }
+
+  if (g_slist_find (priv_data->event_list, event))
+    return FALSE;
+
+  if (priv_data->pending_event)
+    {
+      /* save the event to be propagated in order */
+      priv_data->event_list = g_slist_append (priv_data->event_list,
+					      gdk_event_copy ((GdkEvent*)event));
+      return TRUE;
+    }
+
+  if (event->type == GDK_2BUTTON_PRESS)
+    return FALSE;
+
+  gtk_tree_view_get_path_at_pos (tree_view,
+				 event->x, event->y,
+				 &path, &column,
+				 &cell_x, &cell_y);
+
+  selection = gtk_tree_view_get_selection (tree_view);
+
+  if (path)
+    {
+      gboolean call_parent = (event->state & (GDK_CONTROL_MASK | GDK_SHIFT_MASK) ||
+			      !gtk_tree_selection_path_is_selected (selection, path) ||
+			      event->button != 1);
+
+      if (call_parent)
+	(GTK_WIDGET_GET_CLASS (tree_view))->button_press_event (widget, event);
+
+      if (gtk_tree_selection_path_is_selected (selection, path))
+    {
+      priv_data->pressed_button = event->button;
+      priv_data->x = event->x;
+      priv_data->y = event->y;
+
+      priv_data->pending_event = TRUE;
+      if (!call_parent)
+	priv_data->event_list = g_slist_append (priv_data->event_list,
+						gdk_event_copy ((GdkEvent*)event));
+
+      if (priv_data->motion_notify_handler == 0)
+        {
+          priv_data->motion_notify_handler =
+	    g_signal_connect (G_OBJECT (tree_view),
+	  		      "motion_notify_event",
+			      G_CALLBACK (egg_tree_multi_drag_motion_event),
+			      NULL);
+        }
+
+      if (priv_data->button_release_handler == 0)
+        {
+          priv_data->button_release_handler =
+	    g_signal_connect (G_OBJECT (tree_view),
+	 		      "button_release_event",
+			      G_CALLBACK (egg_tree_multi_drag_button_release_event),
+			      NULL);
+        }
+
+      if (priv_data->drag_data_get_handler == 0)
+	{
+	  priv_data->drag_data_get_handler =
+	    g_signal_connect (G_OBJECT (tree_view),
+			      "drag_data_get",
+			      G_CALLBACK (egg_tree_multi_drag_drag_data_get),
+			      NULL);
+	}
+    }
+
+      gtk_tree_path_free (path);
+      /* We called the default handler so we don't let the default handler run */
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+
+void
+egg_tree_multi_drag_add_drag_support (GtkTreeView *tree_view)
+{
+  g_return_if_fail (GTK_IS_TREE_VIEW (tree_view));
+  g_signal_connect (G_OBJECT (tree_view),
+		    "button_press_event",
+		    G_CALLBACK (egg_tree_multi_drag_button_press_event),
+		    NULL);
+}
+