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-rw-r--r--libegg/eggtreemultidnd.c417
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diff --git a/libegg/eggtreemultidnd.c b/libegg/eggtreemultidnd.c
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--- a/libegg/eggtreemultidnd.c
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-/* 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., 51 Franklin St, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#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;
- 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))
- {
- GdkDragContext *context;
-
- context = gtk_drag_begin_with_coordinates (widget,
- gtk_drag_source_get_target_list (widget),
- di->source_actions,
- priv_data->pressed_button,
- (GdkEvent*)event,
- event->x,
- event->y);
- 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);
-}
-
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