/* 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"
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;
} EggTreeMultiDndData;
/* CUT-N-PASTE from gtktreeview.c */
typedef struct _TreeViewDragInfo TreeViewDragInfo;
struct _TreeViewDragInfo
{
GdkModifierType start_button_mask;
GtkTargetList *source_target_list;
GdkDragAction source_actions;
GtkTargetList *dest_target_list;
guint source_set : 1;
guint dest_set : 1;
};
GType
egg_tree_multi_drag_source_get_type (void)
{
static GType our_type = 0;
if (!our_type)
{
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,
GList *path_list,
GtkSelectionData *selection_data)
{
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, path_list, selection_data);
}
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;
g_signal_handler_disconnect (widget, priv_data->motion_notify_handler);
g_signal_handler_disconnect (widget, priv_data->button_release_handler);
}
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");
}
/* CUT-N-PASTE from gtktreeview.c */
static TreeViewDragInfo*
get_info (GtkTreeView *tree_view)
{
return g_object_get_data (G_OBJECT (tree_view), "gtk-tree-view-drag-info");
}
static void
egg_tree_multi_drag_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time)
{
GtkTreeView *tree_view;
GtkTreeModel *model;
TreeViewDragInfo *di;
GList *path_list;
tree_view = GTK_TREE_VIEW (widget);
model = gtk_tree_view_get_model (tree_view);
if (model == NULL)
return;
di = get_info (GTK_TREE_VIEW (widget));
if (di == NULL)
return;
path_list = get_context_data (context);
if (path_list == NULL)
return;
/* 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))
{
egg_tree_multi_drag_source_drag_data_get (EGG_TREE_MULTI_DRAG_SOURCE (model),
path_list,
selection_data);
}
}
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;
TreeViewDragInfo *di;
di = get_info (GTK_TREE_VIEW (widget));
if (di == NULL)
return FALSE;
selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (widget));
stop_drag_check (widget);
gtk_tree_selection_selected_foreach (selection, selection_foreach, &path_list);
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))
{
context = gtk_drag_begin (widget,
di->source_target_list,
di->source_actions,
priv_data->pressed_button,
(GdkEvent*)event);
set_context_data (context, path_list);
gtk_drag_set_icon_default (context);
}
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;
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);
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->event_list)
{
/* 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 && 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->event_list = g_slist_append (priv_data->event_list, gdk_event_copy ((GdkEvent*)event));
priv_data->motion_notify_handler =
g_signal_connect (G_OBJECT (tree_view), "motion_notify_event", G_CALLBACK (egg_tree_multi_drag_motion_event), NULL);
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);
return TRUE;
}
if (path)
{
gtk_tree_path_free (path);
}
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);
}
