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Diffstat (limited to 'libegg/eggtreemultidnd.c')
| -rw-r--r-- | libegg/eggtreemultidnd.c | 417 |
1 files changed, 417 insertions, 0 deletions
diff --git a/libegg/eggtreemultidnd.c b/libegg/eggtreemultidnd.c new file mode 100644 index 00000000..062bb57e --- /dev/null +++ b/libegg/eggtreemultidnd.c @@ -0,0 +1,417 @@ +/* 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; + 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_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); +} + |