/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * 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. */ /* This file implements most of the work of the ICCM selection protocol. * The code was written after an intensive study of the equivalent part * of John Ousterhout's Tk toolkit, and does many things in much the * same way. * * The one thing in the ICCM that isn't fully supported here (or in Tk) * is side effects targets. For these to be handled properly, MULTIPLE * targets need to be done in the order specified. This cannot be * guaranteed with the way we do things, since if we are doing INCR * transfers, the order will depend on the timing of the requestor. * * By Owen Taylor 8/16/97 */ /* Terminology note: when not otherwise specified, the term "incr" below * refers to the _sending_ part of the INCR protocol. The receiving * portion is referred to just as "retrieval". (Terminology borrowed * from Tk, because there is no good opposite to "retrieval" in English. * "send" can't be made into a noun gracefully and we're already using * "emission" for something else ....) */ /* The MOTIF entry widget seems to ask for the TARGETS target, then (regardless of the reply) ask for the TEXT target. It's slightly possible though that it somehow thinks we are responding negatively to the TARGETS request, though I don't really think so ... */ #include #include #include /* we need this for gdk_window_lookup() */ #include "gtkmain.h" #include "gtkselection.h" #include "gtksignal.h" /* #define DEBUG_SELECTION */ /* Maximum size of a sent chunk, in bytes. Also the default size of our buffers */ #define GTK_SELECTION_MAX_SIZE 4000 enum { INCR, MULTIPLE, TARGETS, TIMESTAMP, LAST_ATOM }; typedef struct _GtkSelectionInfo GtkSelectionInfo; typedef struct _GtkIncrConversion GtkIncrConversion; typedef struct _GtkIncrInfo GtkIncrInfo; typedef struct _GtkRetrievalInfo GtkRetrievalInfo; typedef struct _GtkSelectionHandler GtkSelectionHandler; struct _GtkSelectionInfo { GdkAtom selection; GtkWidget *widget; /* widget that owns selection */ guint32 time; /* time used to acquire selection */ }; struct _GtkIncrConversion { GdkAtom target; /* Requested target */ GdkAtom property; /* Property to store in */ GtkSelectionData data; /* The data being supplied */ gint offset; /* Current offset in sent selection. * -1 => All done * -2 => Only the final (empty) portion * left to send */ }; struct _GtkIncrInfo { GtkWidget *widget; /* Selection owner */ GdkWindow *requestor; /* Requestor window - we create a GdkWindow so we can receive events */ GdkAtom selection; /* Selection we're sending */ GtkIncrConversion *conversions; /* Information about requested conversions - * With MULTIPLE requests (benighted 1980's * hardware idea), there can be more than * one */ gint num_conversions; gint num_incrs; /* number of remaining INCR style transactions */ guint32 idle_time; }; struct _GtkRetrievalInfo { GtkWidget *widget; GdkAtom selection; /* Selection being retrieved. */ GdkAtom target; /* Form of selection that we requested */ guint32 idle_time; /* Number of seconds since we last heard from selection owner */ guchar *buffer; /* Buffer in which to accumulate results */ gint offset; /* Current offset in buffer, -1 indicates not yet started */ }; struct _GtkSelectionHandler { GdkAtom selection; /* selection thats handled */ GdkAtom target; /* target thats handled */ GtkSelectionFunction function; /* callback function */ GtkCallbackMarshal marshal; /* Marshalling function */ gpointer data; /* callback data */ GtkDestroyNotify destroy; /* called when callback is removed */ }; /* Local Functions */ static void gtk_selection_init (void); static gint gtk_selection_incr_timeout (GtkIncrInfo *info); static gint gtk_selection_retrieval_timeout (GtkRetrievalInfo *info); static void gtk_selection_retrieval_report (GtkRetrievalInfo *info, GdkAtom type, gint format, guchar *buffer, gint length); static void gtk_selection_invoke_handler (GtkWidget *widget, GtkSelectionData *data); static void gtk_selection_default_handler (GtkWidget *widget, GtkSelectionData *data); /* Local Data */ static gint initialize = TRUE; static GList *current_retrievals = NULL; static GList *current_incrs = NULL; static GList *current_selections = NULL; static GdkAtom gtk_selection_atoms[LAST_ATOM]; static const char *gtk_selection_handler_key = "gtk-selection-handlers"; /************************************************************* * gtk_selection_owner_set: * Claim ownership of a selection. * arguments: * widget: new selection owner * selection: which selection * time: time (use GDK_CURRENT_TIME only if necessary) * * results: *************************************************************/ gint gtk_selection_owner_set (GtkWidget *widget, GdkAtom selection, guint32 time) { GList *tmp_list; GtkWidget *old_owner; GtkSelectionInfo *selection_info; GdkWindow *window; if (widget == NULL) window = NULL; else { if (!GTK_WIDGET_REALIZED (widget)) gtk_widget_realize (widget); window = widget->window; } tmp_list = current_selections; while (tmp_list) { selection_info = (GtkSelectionInfo *)tmp_list->data; if (selection_info->selection == selection) break; tmp_list = tmp_list->next; } if (tmp_list == NULL) selection_info = NULL; else if (selection_info->widget == widget) return TRUE; if (gdk_selection_owner_set (window, selection, time, TRUE)) { old_owner = NULL; if (widget == NULL) { if (selection_info) { old_owner = selection_info->widget; current_selections = g_list_remove_link (current_selections, tmp_list); g_list_free (tmp_list); g_free (selection_info); } } else { if (selection_info == NULL) { selection_info = g_new (GtkSelectionInfo, 1); selection_info->selection = selection; selection_info->widget = widget; selection_info->time = time; current_selections = g_list_append (current_selections, selection_info); } else { old_owner = selection_info->widget; selection_info->widget = widget; selection_info->time = time; } } /* If another widget in the application lost the selection, * send it a GDK_SELECTION_CLEAR event, unless we're setting * the owner to None, in which case an event will be sent */ if (old_owner && (widget != NULL)) { GdkEventSelection event; event.type = GDK_SELECTION_CLEAR; event.window = old_owner->window; event.selection = selection; event.time = time; gtk_widget_event (old_owner, (GdkEvent *) &event); } return TRUE; } else return FALSE; } /************************************************************* * gtk_selection_add_handler_full: * Add a handler for a specified selection/target pair * * arguments: * widget: The widget the handler applies to * selection: * target: * format: Format in which this handler will return data * function: Callback function (can be NULL) * marshal: Callback marshal function * data: User data for callback * destroy: Called when handler removed * * results: *************************************************************/ void gtk_selection_add_handler (GtkWidget *widget, GdkAtom selection, GdkAtom target, GtkSelectionFunction function, gpointer data) { gtk_selection_add_handler_full (widget, selection, target, function, NULL, data, NULL); } void gtk_selection_add_handler_full (GtkWidget *widget, GdkAtom selection, GdkAtom target, GtkSelectionFunction function, GtkCallbackMarshal marshal, gpointer data, GtkDestroyNotify destroy) { GList *selection_handlers; GList *tmp_list; GtkSelectionHandler *handler; g_return_if_fail (widget != NULL); if (initialize) gtk_selection_init (); selection_handlers = gtk_object_get_data (GTK_OBJECT (widget), gtk_selection_handler_key); /* Reuse old handler structure, if present */ tmp_list = selection_handlers; while (tmp_list) { handler = (GtkSelectionHandler *)tmp_list->data; if ((handler->selection == selection) && (handler->target == target)) { if (handler->destroy) (*handler->destroy)(handler->data); if (function) { handler->function = function; handler->marshal = marshal; handler->data = data; handler->destroy = destroy; } else { selection_handlers = g_list_remove_link (selection_handlers, tmp_list); g_list_free (tmp_list); g_free (handler); } return; } tmp_list = tmp_list->next; } if (tmp_list == NULL && function) { handler = g_new (GtkSelectionHandler, 1); handler->selection = selection; handler->target = target; handler->function = function; handler->marshal = marshal; handler->data = data; handler->destroy = destroy; selection_handlers = g_list_append (selection_handlers, handler); } gtk_object_set_data (GTK_OBJECT (widget), gtk_selection_handler_key, selection_handlers); } /************************************************************* * gtk_selection_remove_all: * Removes all handlers and unsets ownership of all * selections for a widget. Called when widget is being * destroyed * * arguments: * widget: The widget * results: *************************************************************/ void gtk_selection_remove_all (GtkWidget *widget) { GList *tmp_list; GList *next; GtkSelectionInfo *selection_info; GList *selection_handlers; GtkSelectionHandler *handler; /* Remove pending requests/incrs for this widget */ tmp_list = current_incrs; while (tmp_list) { next = tmp_list->next; if (((GtkIncrInfo *)tmp_list->data)->widget == widget) { current_incrs = g_list_remove_link (current_incrs, tmp_list); /* structure will be freed in timeout */ g_list_free (tmp_list); } tmp_list = next; } tmp_list = current_retrievals; while (tmp_list) { next = tmp_list->next; if (((GtkRetrievalInfo *)tmp_list->data)->widget == widget) { current_retrievals = g_list_remove_link (current_retrievals, tmp_list); /* structure will be freed in timeout */ g_list_free (tmp_list); } tmp_list = next; } /* Disclaim ownership of any selections */ tmp_list = current_selections; while (tmp_list) { next = tmp_list->next; selection_info = (GtkSelectionInfo *)tmp_list->data; if (selection_info->widget == widget) { gdk_selection_owner_set (NULL, selection_info->selection, GDK_CURRENT_TIME, FALSE); current_selections = g_list_remove_link (current_selections, tmp_list); g_list_free (tmp_list); g_free (selection_info); } tmp_list = next; } /* Now remove all handlers */ selection_handlers = gtk_object_get_data (GTK_OBJECT (widget), gtk_selection_handler_key); gtk_object_remove_data (GTK_OBJECT (widget), gtk_selection_handler_key); tmp_list = selection_handlers; while (tmp_list) { next = tmp_list->next; handler = (GtkSelectionHandler *)tmp_list->data; if (handler->destroy) (*handler->destroy)(handler->data); g_free (handler); tmp_list = next; } g_list_free (selection_handlers); } /************************************************************* * gtk_selection_convert: * Request the contents of a selection. When received, * a "selection_received" signal will be generated. * * arguments: * widget: The widget which acts as requestor * selection: Which selection to get * target: Form of information desired (e.g., STRING) * time: Time of request (usually of triggering event) * In emergency, you could use GDK_CURRENT_TIME * * results: * TRUE if requested succeeded. FALSE if we could not process * request. (e.g., there was already a request in process for * this widget). *************************************************************/ gint gtk_selection_convert (GtkWidget *widget, GdkAtom selection, GdkAtom target, guint32 time) { GtkRetrievalInfo *info; GList *tmp_list; GdkWindow *owner_window; g_return_val_if_fail (widget != NULL, FALSE); if (initialize) gtk_selection_init (); if (!GTK_WIDGET_REALIZED (widget)) gtk_widget_realize (widget); /* Check to see if there are already any retrievals in progress for this widget. If we changed GDK to use the selection for the window property in which to store the retrieved information, then we could support multiple retrievals for different selections. This might be useful for DND. */ tmp_list = current_retrievals; while (tmp_list) { info = (GtkRetrievalInfo *)tmp_list->data; if (info->widget == widget) return FALSE; tmp_list = tmp_list->next; } info = g_new (GtkRetrievalInfo, 1); info->widget = widget; info->selection = selection; info->target = target; info->buffer = NULL; info->offset = -1; /* Check if this process has current owner. If so, call handler procedure directly to avoid deadlocks with INCR. */ owner_window = gdk_selection_owner_get (selection); if (owner_window != NULL) { GtkWidget *owner_widget; GtkSelectionData selection_data; selection_data.selection = selection; selection_data.target = target; selection_data.data = NULL; selection_data.length = -1; gdk_window_get_user_data (owner_window, (gpointer *)&owner_widget); if (owner_widget != NULL) { gtk_selection_invoke_handler (owner_widget, &selection_data); gtk_selection_retrieval_report (info, selection_data.type, selection_data.format, selection_data.data, selection_data.length); g_free (selection_data.data); g_free (info); return TRUE; } } /* Otherwise, we need to go through X */ current_retrievals = g_list_append (current_retrievals, info); gdk_selection_convert (widget->window, selection, target, time); gtk_timeout_add (1000, (GtkFunction) gtk_selection_retrieval_timeout, info); return TRUE; } /************************************************************* * gtk_selection_data_set: * Store new data into a GtkSelectionData object. Should * _only_ by called from a selection handler callback. * Null terminates the stored data. * arguments: * type: the type of selection data * format: format (number of bits in a unit) * data: pointer to the data (will be copied) * length: length of the data * results: *************************************************************/ void gtk_selection_data_set (GtkSelectionData *selection_data, GdkAtom type, gint format, guchar *data, gint length) { if (selection_data->data) g_free (selection_data->data); selection_data->type = type; selection_data->format = format; if (data) { selection_data->data = g_new (guchar, length+1); memcpy (selection_data->data, data, length); selection_data->data[length] = 0; } else selection_data->data = NULL; selection_data->length = length; } /************************************************************* * gtk_selection_init: * Initialize local variables * arguments: * * results: *************************************************************/ static void gtk_selection_init (void) { gtk_selection_atoms[INCR] = gdk_atom_intern ("INCR", FALSE); gtk_selection_atoms[MULTIPLE] = gdk_atom_intern ("MULTIPLE", FALSE); gtk_selection_atoms[TIMESTAMP] = gdk_atom_intern ("TIMESTAMP", FALSE); gtk_selection_atoms[TARGETS] = gdk_atom_intern ("TARGETS", FALSE); } /************************************************************* * gtk_selection_clear: * Handler for "selection_clear_event" * arguments: * widget: * event: * results: *************************************************************/ gint gtk_selection_clear (GtkWidget *widget, GdkEventSelection *event) { /* FIXME: there can be a problem if we change the selection via gtk_selection_owner_set after another client claims the selection, but before we get the notification event. Tk filters based on serial #'s, which aren't retained by GTK. Filtering based on time's will be inherently somewhat unreliable. */ GList *tmp_list; GtkSelectionInfo *selection_info; tmp_list = current_selections; while (tmp_list) { selection_info = (GtkSelectionInfo *)tmp_list->data; if ((selection_info->selection == event->selection) && (selection_info->widget == widget)) break; tmp_list = tmp_list->next; } if (tmp_list) { if (selection_info->time > event->time) return FALSE; /* return FALSE to indicate that * the selection was out of date, * and this clear should be ignored */ else { current_selections = g_list_remove_link (current_selections, tmp_list); g_list_free (tmp_list); g_free (selection_info); } } return TRUE; } /************************************************************* * gtk_selection_request: * Handler for "selection_request_event" * arguments: * widget: * event: * results: *************************************************************/ gint gtk_selection_request (GtkWidget *widget, GdkEventSelection *event) { GtkIncrInfo *info; GList *tmp_list; guchar *mult_atoms; int i; /* Check if we own selection */ tmp_list = current_selections; while (tmp_list) { GtkSelectionInfo *selection_info = (GtkSelectionInfo *)tmp_list->data; if ((selection_info->selection == event->selection) && (selection_info->widget == widget)) break; tmp_list = tmp_list->next; } if (tmp_list == NULL) return FALSE; info = g_new(GtkIncrInfo, 1); info->widget = widget; info->selection = event->selection; info->num_incrs = 0; /* Create GdkWindow structure for the requestor */ info->requestor = gdk_window_lookup (event->requestor); if (!info->requestor) info->requestor = gdk_window_foreign_new (event->requestor); /* Determine conversions we need to perform */ if (event->target == gtk_selection_atoms[MULTIPLE]) { GdkAtom type; gint format; gint length; mult_atoms = NULL; if (!gdk_property_get (info->requestor, event->property, GDK_SELECTION_TYPE_ATOM, 0, GTK_SELECTION_MAX_SIZE, FALSE, &type, &format, &length, &mult_atoms) || type != GDK_SELECTION_TYPE_ATOM || format != 8*sizeof(GdkAtom)) { gdk_selection_send_notify (event->requestor, event->selection, event->target, GDK_NONE, event->time); g_free (mult_atoms); g_free (info); return TRUE; } info->num_conversions = length / (2*sizeof (GdkAtom)); info->conversions = g_new (GtkIncrConversion, info->num_conversions); for (i=0; inum_conversions; i++) { info->conversions[i].target = ((GdkAtom *)mult_atoms)[2*i]; info->conversions[i].property = ((GdkAtom *)mult_atoms)[2*i+1]; } } else /* only a single conversion */ { info->conversions = g_new (GtkIncrConversion, 1); info->num_conversions = 1; info->conversions[0].target = event->target; info->conversions[0].property = event->property; mult_atoms = (guchar *)info->conversions; } /* Loop through conversions and determine which of these are big enough to require doing them via INCR */ for (i=0; inum_conversions; i++) { GtkSelectionData data; gint items; data.selection = event->selection; data.target = info->conversions[i].target; data.data = NULL; data.length = -1; #ifdef DEBUG_SELECTION g_message ("Selection %ld, target %ld (%s) requested by 0x%x (property = %ld)", event->selection, info->conversions[i].target, gdk_atom_name(info->conversions[i].target), event->requestor, event->property); #endif gtk_selection_invoke_handler (widget, &data); if (data.length < 0) { ((GdkAtom *)mult_atoms)[2*i+1] = GDK_NONE; info->conversions[i].property = GDK_NONE; continue; } g_return_val_if_fail ((data.format >= 8) && (data.format % 8 == 0), FALSE); items = (data.length + data.format/8 - 1) / (data.format/8); if (data.length > GTK_SELECTION_MAX_SIZE) { /* Sending via INCR */ info->conversions[i].offset = 0; info->conversions[i].data = data; info->num_incrs++; gdk_property_change (info->requestor, info->conversions[i].property, gtk_selection_atoms[INCR], 8*sizeof (GdkAtom), GDK_PROP_MODE_REPLACE, (guchar *)&items, 1); } else { info->conversions[i].offset = -1; gdk_property_change (info->requestor, info->conversions[i].property, data.type, data.format, GDK_PROP_MODE_REPLACE, data.data, items); g_free (data.data); } } /* If we have some INCR's, we need to send the rest of the data in a callback */ if (info->num_incrs > 0) { /* FIXME: this could be dangerous if window doesn't still exist */ #ifdef DEBUG_SELECTION g_message ("Starting INCR..."); #endif gdk_window_set_events (info->requestor, gdk_window_get_events (info->requestor) | GDK_PROPERTY_CHANGE_MASK); current_incrs = g_list_append (current_incrs, info); gtk_timeout_add (1000, (GtkFunction)gtk_selection_incr_timeout, info); } /* If it was a MULTIPLE request, set the property to indicate which conversions succeeded */ if (event->target == gtk_selection_atoms[MULTIPLE]) { gdk_property_change (info->requestor, event->property, GDK_SELECTION_TYPE_ATOM, 8*sizeof(GdkAtom), GDK_PROP_MODE_REPLACE, mult_atoms, info->num_conversions); g_free (mult_atoms); } gdk_selection_send_notify (event->requestor, event->selection, event->target, event->property, event->time); if (info->num_incrs == 0) { g_free (info->conversions); g_free (info); } return TRUE; } /************************************************************* * gtk_selection_incr_event: * Called whenever an PropertyNotify event occurs for an * GdkWindow with user_data == NULL. These will be notifications * that a window we are sending the selection to via the * INCR protocol has deleted a property and is ready for * more data. * * arguments: * window: the requestor window * event: the property event structure * * results: *************************************************************/ gint gtk_selection_incr_event (GdkWindow *window, GdkEventProperty *event) { GList *tmp_list; GtkIncrInfo *info; gint num_bytes; guchar *buffer; int i; if (event->state != GDK_PROPERTY_DELETE) return FALSE; #ifdef DEBUG_SELECTION g_message ("PropertyDelete, property %ld", event->atom); #endif /* Now find the appropriate ongoing INCR */ tmp_list = current_incrs; while (tmp_list) { info = (GtkIncrInfo *)tmp_list->data; if (info->requestor == event->window) break; tmp_list = tmp_list->next; } if (tmp_list == NULL) return FALSE; /* Find out which target this is for */ for (i=0; inum_conversions; i++) { if (info->conversions[i].property == event->atom && info->conversions[i].offset != -1) { info->idle_time = 0; if (info->conversions[i].offset == -2) /* only the last 0-length piece*/ { num_bytes = 0; buffer = NULL; } else { num_bytes = info->conversions[i].data.length - info->conversions[i].offset; buffer = info->conversions[i].data.data + info->conversions[i].offset; if (num_bytes > GTK_SELECTION_MAX_SIZE) { num_bytes = GTK_SELECTION_MAX_SIZE; info->conversions[i].offset += GTK_SELECTION_MAX_SIZE; } else info->conversions[i].offset = -2; } #ifdef DEBUG_SELECTION g_message ("INCR: put %d bytes (offset = %d) into window 0x%lx , property %ld", num_bytes, info->conversions[i].offset, GDK_WINDOW_XWINDOW(info->requestor), event->atom); #endif gdk_property_change (info->requestor, event->atom, info->conversions[i].data.type, info->conversions[i].data.format, GDK_PROP_MODE_REPLACE, buffer, (num_bytes + info->conversions[i].data.format/8 - 1) / (info->conversions[i].data.format/8)); if (info->conversions[i].offset == -2) { g_free (info->conversions[i].data.data); info->conversions[i].data.data = NULL; } if (num_bytes == 0) { info->num_incrs--; info->conversions[i].offset = -1; } } break; } /* Check if we're finished with all the targets */ if (info->num_incrs == 0) { current_incrs = g_list_remove_link (current_incrs, tmp_list); g_list_free (tmp_list); /* Let the timeout free it */ } return TRUE; } /************************************************************* * gtk_selection_incr_timeout: * Timeout callback for the sending portion of the INCR * protocol * arguments: * info: Information about this incr * results: *************************************************************/ static gint gtk_selection_incr_timeout (GtkIncrInfo *info) { GList *tmp_list; /* Determine if retrieval has finished by checking if it still in list of pending retrievals */ tmp_list = current_incrs; while (tmp_list) { if (info == (GtkIncrInfo *)tmp_list->data) break; tmp_list = tmp_list->next; } /* If retrieval is finished */ if (!tmp_list || info->idle_time >= 5) { if (tmp_list && info->idle_time >= 5) { current_incrs = g_list_remove_link (current_incrs, tmp_list); g_list_free (tmp_list); } g_free (info->conversions); /* FIXME: we should check if requestor window is still in use, and if not, remove it? */ g_free (info); return FALSE; /* remove timeout */ } else { info->idle_time++; return TRUE; /* timeout will happen again */ } } /************************************************************* * gtk_selection_notify: * Handler for "selection_notify_event" signals on windows * where a retrieval is currently in process. The selection * owner has responded to our conversion request. * arguments: * widget: Widget getting signal * event: Selection event structure * info: Information about this retrieval * results: * was event handled? *************************************************************/ gint gtk_selection_notify (GtkWidget *widget, GdkEventSelection *event) { GList *tmp_list; GtkRetrievalInfo *info; guchar *buffer; gint length; GdkAtom type; gint format; #ifdef DEBUG_SELECTION g_message ("Initial receipt of selection %ld, target %ld (property = %ld)", event->selection, event->target, event->property); #endif tmp_list = current_retrievals; while (tmp_list) { info = (GtkRetrievalInfo *)tmp_list->data; if (info->widget == widget && info->selection == event->selection) break; tmp_list = tmp_list->next; } if (!tmp_list) /* no retrieval in progress */ return FALSE; if (event->property == GDK_NONE) { current_retrievals = g_list_remove_link (current_retrievals, tmp_list); g_list_free (tmp_list); /* structure will be freed in timeout */ gtk_selection_retrieval_report (info, GDK_NONE, 0, NULL, -1); return TRUE; } length = gdk_selection_property_get (widget->window, &buffer, &type, &format); if (type == gtk_selection_atoms[INCR]) { /* The remainder of the selection will come through PropertyNotify events */ info->idle_time = 0; info->offset = 0; /* Mark as OK to proceed */ gdk_window_set_events (widget->window, gdk_window_get_events (widget->window) | GDK_PROPERTY_CHANGE_MASK); } else { /* We don't delete the info structure - that will happen in timeout */ current_retrievals = g_list_remove_link (current_retrievals, tmp_list); g_list_free (tmp_list); info->offset = length; gtk_selection_retrieval_report (info, type, format, buffer, length); } gdk_property_delete (widget->window, event->property); g_free (buffer); return TRUE; } /************************************************************* * gtk_selection_property_notify: * Handler for "property_notify_event" signals on windows * where a retrieval is currently in process. The selection * owner has added more data. * arguments: * widget: Widget getting signal * event: Property event structure * info: Information about this retrieval * results: * was event handled? *************************************************************/ gint gtk_selection_property_notify (GtkWidget *widget, GdkEventProperty *event) { GList *tmp_list; GtkRetrievalInfo *info; guchar *new_buffer; int length; GdkAtom type; gint format; if ((event->state != GDK_PROPERTY_NEW_VALUE) || /* property was deleted */ (event->atom != gdk_selection_property)) /* not the right property */ return FALSE; #ifdef DEBUG_SELECTION g_message ("PropertyNewValue, property %ld", event->atom); #endif tmp_list = current_retrievals; while (tmp_list) { info = (GtkRetrievalInfo *)tmp_list->data; if (info->widget == widget) break; tmp_list = tmp_list->next; } if (!tmp_list) /* No retrieval in progress */ return FALSE; if (info->offset < 0) /* We haven't got the SelectionNotify for this retrieval yet */ return FALSE; info->idle_time = 0; length = gdk_selection_property_get (widget->window, &new_buffer, &type, &format); gdk_property_delete (widget->window, event->atom); /* We could do a lot better efficiency-wise by paying attention to what length was sent in the initial INCR transaction, instead of doing memory allocation at every step. But its only guaranteed to be a _lower bound_ (pretty useless!) */ if (length == 0 || type == GDK_NONE) /* final zero length portion */ { /* Info structure will be freed in timeout */ current_retrievals = g_list_remove_link (current_retrievals, tmp_list); g_list_free (tmp_list); gtk_selection_retrieval_report (info, type, format, (type == GDK_NONE) ? NULL : info->buffer, (type == GDK_NONE) ? -1 : info->offset); } else /* append on newly arrived data */ { if (!info->buffer) { #ifdef DEBUG_SELECTION g_message ("Start - Adding %d bytes at offset 0", length); #endif info->buffer = new_buffer; info->offset = length; } else { #ifdef DEBUG_SELECTION g_message ("Appending %d bytes at offset %d", length,info->offset); #endif /* We copy length+1 bytes to preserve guaranteed null termination */ info->buffer = g_realloc (info->buffer, info->offset+length+1); memcpy (info->buffer + info->offset, new_buffer, length+1); info->offset += length; g_free (new_buffer); } } return TRUE; } /************************************************************* * gtk_selection_retrieval_timeout: * Timeout callback while receiving a selection. * arguments: * info: Information about this retrieval * results: *************************************************************/ static gint gtk_selection_retrieval_timeout (GtkRetrievalInfo *info) { GList *tmp_list; /* Determine if retrieval has finished by checking if it still in list of pending retrievals */ tmp_list = current_retrievals; while (tmp_list) { if (info == (GtkRetrievalInfo *)tmp_list->data) break; tmp_list = tmp_list->next; } /* If retrieval is finished */ if (!tmp_list || info->idle_time >= 5) { if (tmp_list && info->idle_time >= 5) { current_retrievals = g_list_remove_link (current_retrievals, tmp_list); g_list_free (tmp_list); gtk_selection_retrieval_report (info, GDK_NONE, 0, NULL, -1); } g_free (info->buffer); g_free (info); return FALSE; /* remove timeout */ } else { info->idle_time++; return TRUE; /* timeout will happen again */ } } /************************************************************* * gtk_selection_retrieval_report: * Emits a "selection_received" signal. * arguments: * info: information about the retrieval that completed * buffer: buffer containing data (NULL => errror) * results: *************************************************************/ static void gtk_selection_retrieval_report (GtkRetrievalInfo *info, GdkAtom type, gint format, guchar *buffer, gint length) { GtkSelectionData data; data.selection = info->selection; data.target = info->target; data.type = type; data.format = format; data.length = length; data.data = buffer; gtk_signal_emit_by_name (GTK_OBJECT(info->widget), "selection_received", &data); } /************************************************************* * gtk_selection_invoke_handler: * Finds and invokes handler for specified * widget/selection/target combination, calls * gtk_selection_default_handler if none exists. * * arguments: * widget: selection owner * data: selection data [INOUT] * * results: * Number of bytes written to buffer, -1 if error *************************************************************/ static void gtk_selection_invoke_handler (GtkWidget *widget, GtkSelectionData *data) { GList *tmp_list; GtkSelectionHandler *handler; g_return_if_fail (widget != NULL); tmp_list = gtk_object_get_data (GTK_OBJECT (widget), gtk_selection_handler_key); while (tmp_list) { handler = (GtkSelectionHandler *)tmp_list->data; if ((handler->selection == data->selection) && (handler->target == data->target)) break; tmp_list = tmp_list->next; } if (tmp_list == NULL) gtk_selection_default_handler (widget, data); else { if (handler->marshal) { GtkArg args[2]; args[0].type = GTK_TYPE_BOXED; args[0].name = NULL; GTK_VALUE_BOXED(args[0]) = data; args[1].type = GTK_TYPE_NONE; args[1].name = NULL; handler->marshal (GTK_OBJECT(widget), handler->data, 1, args); } else if (handler->function) handler->function (widget, data, handler->data); } } /************************************************************* * gtk_selection_default_handler: * Handles some default targets that exist for any widget * If it can't fit results into buffer, returns -1. This * won't happen in any conceivable case, since it would * require 1000 selection targets! * * arguments: * widget: selection owner * data: selection data [INOUT] * *************************************************************/ static void gtk_selection_default_handler (GtkWidget *widget, GtkSelectionData *data) { if (data->target == gtk_selection_atoms[TIMESTAMP]) { /* Time which was used to obtain selection */ GList *tmp_list; GtkSelectionInfo *selection_info; tmp_list = current_selections; while (tmp_list) { selection_info = (GtkSelectionInfo *)tmp_list->data; if ((selection_info->widget == widget) && (selection_info->selection == data->selection)) { gtk_selection_data_set (data, GDK_SELECTION_TYPE_INTEGER, sizeof (guint32)*8, (guchar *)&selection_info->time, sizeof (guint32)); return; } tmp_list = tmp_list->next; } data->length = -1; } else if (data->target == gtk_selection_atoms[TARGETS]) { /* List of all targets supported for this widget/selection pair */ GdkAtom *p; gint count; GList *tmp_list; GtkSelectionHandler *handler; count = 3; tmp_list = gtk_object_get_data (GTK_OBJECT(widget), gtk_selection_handler_key); while (tmp_list) { handler = (GtkSelectionHandler *)tmp_list->data; if (handler->selection == data->selection) count++; tmp_list = tmp_list->next; } data->type = GDK_SELECTION_TYPE_ATOM; data->format = 8*sizeof (GdkAtom); data->length = count*sizeof (GdkAtom); p = g_new (GdkAtom, count); data->data = (guchar *)p; *p++ = gtk_selection_atoms[TIMESTAMP]; *p++ = gtk_selection_atoms[TARGETS]; *p++ = gtk_selection_atoms[MULTIPLE]; tmp_list = gtk_object_get_data (GTK_OBJECT(widget), gtk_selection_handler_key); while (tmp_list) { handler = (GtkSelectionHandler *)tmp_list->data; if (handler->selection == data->selection) *p++ = handler->target; tmp_list = tmp_list->next; } } else { data->length = -1; } } GtkSelectioData* gtk_selection_data_copy (GtkSelectionData *data) { GtkSelectionData *new_data; g_return_val_if_fail (data != NULL, NULL); new_data = g_new (GtkSelectionData, 1); *new_data = *data; return new_data; } void gtk_selection_data_free (GtkSelectionData *data) { g_return_if_fail (data != NULL); g_free (data); }