a984622cd1
MetaSelectionSource represents a primary/clipboard/dnd selection owner, it is an abstract type so wayland/x11/etc implementations can be provided. These 3 selections are managed by the MetaSelection object, the current selection owners will be set there, and signals will be emitted so the previous selection owner can clean itself up. The actual data transfer is done through the meta_selection_transfer_async() call, which will take a GOutputStream and create a corresponding GInputStream from the MetaSelectionSource in order to splice them. https://gitlab.gnome.org/GNOME/mutter/merge_requests/320
297 lines
8.5 KiB
C
297 lines
8.5 KiB
C
/*
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* Copyright (C) 2018 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* Author: Carlos Garnacho <carlosg@gnome.org>
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*/
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#include "config.h"
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#include "core/meta-selection.h"
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typedef struct TransferRequest TransferRequest;
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struct _MetaSelection
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{
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GObject parent_instance;
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MetaDisplay *display;
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MetaSelectionSource *owners[META_N_SELECTION_TYPES];
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};
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struct TransferRequest
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{
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MetaSelectionType selection_type;
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GInputStream *istream;
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GOutputStream *ostream;
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gssize len;
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};
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enum
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{
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OWNER_CHANGED,
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N_SIGNALS
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};
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static guint signals[N_SIGNALS] = { 0 };
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G_DEFINE_TYPE (MetaSelection, meta_selection, G_TYPE_OBJECT)
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static void
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meta_selection_class_init (MetaSelectionClass *klass)
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{
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signals[OWNER_CHANGED] =
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g_signal_new ("owner-changed",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL, NULL,
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G_TYPE_NONE, 2,
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G_TYPE_UINT,
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META_TYPE_SELECTION_SOURCE);
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}
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static void
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meta_selection_init (MetaSelection *selection)
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{
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}
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MetaSelection *
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meta_selection_new (MetaDisplay *display)
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{
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return g_object_new (META_TYPE_SELECTION,
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NULL);
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}
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void
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meta_selection_set_owner (MetaSelection *selection,
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MetaSelectionType selection_type,
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MetaSelectionSource *owner)
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{
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g_return_if_fail (META_IS_SELECTION (selection));
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g_return_if_fail (selection_type < META_N_SELECTION_TYPES);
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if (selection->owners[selection_type] == owner)
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return;
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if (selection->owners[selection_type])
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g_signal_emit_by_name (selection->owners[selection_type], "deactivated");
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g_set_object (&selection->owners[selection_type], owner);
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g_signal_emit_by_name (owner, "activated");
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g_signal_emit (selection, signals[OWNER_CHANGED], 0, selection_type, owner);
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}
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void
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meta_selection_unset_owner (MetaSelection *selection,
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MetaSelectionType selection_type,
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MetaSelectionSource *owner)
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{
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g_return_if_fail (META_IS_SELECTION (selection));
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g_return_if_fail (selection_type < META_N_SELECTION_TYPES);
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if (selection->owners[selection_type] == owner)
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{
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g_signal_emit_by_name (owner, "deactivated");
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g_clear_object (&selection->owners[selection_type]);
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g_signal_emit (selection, signals[OWNER_CHANGED], 0,
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selection_type, NULL);
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}
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}
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GList *
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meta_selection_get_mimetypes (MetaSelection *selection,
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MetaSelectionType selection_type)
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{
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g_return_val_if_fail (META_IS_SELECTION (selection), NULL);
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g_return_val_if_fail (selection_type < META_N_SELECTION_TYPES, NULL);
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if (!selection->owners[selection_type])
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return NULL;
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return meta_selection_source_get_mimetypes (selection->owners[selection_type]);
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}
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static TransferRequest *
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transfer_request_new (GOutputStream *ostream,
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MetaSelectionType selection_type,
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gssize len)
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{
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TransferRequest *request;
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request = g_new0 (TransferRequest, 1);
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request->ostream = g_object_ref (ostream);
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request->selection_type = selection_type;
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request->len = len;
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return request;
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}
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static void
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transfer_request_free (TransferRequest *request)
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{
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g_clear_object (&request->istream);
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g_clear_object (&request->ostream);
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g_free (request);
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}
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static void
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splice_cb (GOutputStream *stream,
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GAsyncResult *result,
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GTask *task)
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{
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GError *error = NULL;
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g_output_stream_splice_finish (stream, result, &error);
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if (error)
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{
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g_task_return_error (task, error);
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g_object_unref (task);
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return;
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}
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g_task_return_boolean (task, TRUE);
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g_object_unref (task);
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}
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static void
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write_cb (GOutputStream *stream,
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GAsyncResult *result,
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GTask *task)
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{
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GError *error = NULL;
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g_output_stream_write_bytes_finish (stream, result, &error);
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if (error)
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{
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g_task_return_error (task, error);
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g_object_unref (task);
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return;
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}
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g_task_return_boolean (task, TRUE);
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g_object_unref (task);
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}
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static void
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read_cb (GInputStream *stream,
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GAsyncResult *result,
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GTask *task)
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{
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TransferRequest *request;
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GError *error = NULL;
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GBytes *bytes;
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bytes = g_input_stream_read_bytes_finish (stream, result, &error);
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if (error)
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{
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g_task_return_error (task, error);
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g_object_unref (task);
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return;
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}
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request = g_task_get_task_data (task);
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g_output_stream_write_bytes_async (request->ostream,
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bytes,
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G_PRIORITY_DEFAULT,
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g_task_get_cancellable (task),
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(GAsyncReadyCallback) write_cb,
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task);
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g_bytes_unref (bytes);
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}
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static void
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source_read_cb (MetaSelectionSource *source,
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GAsyncResult *result,
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GTask *task)
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{
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TransferRequest *request;
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GInputStream *stream;
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GError *error = NULL;
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stream = meta_selection_source_read_finish (source, result, &error);
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if (!stream)
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{
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g_task_return_error (task, error);
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return;
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}
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request = g_task_get_task_data (task);
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request->istream = stream;
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if (request->len < 0)
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{
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g_output_stream_splice_async (request->ostream,
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request->istream,
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G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE |
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G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
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G_PRIORITY_DEFAULT,
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g_task_get_cancellable (task),
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(GAsyncReadyCallback) splice_cb,
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task);
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}
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else
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{
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g_input_stream_read_bytes_async (request->istream,
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(gsize) request->len,
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G_PRIORITY_DEFAULT,
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g_task_get_cancellable (task),
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(GAsyncReadyCallback) read_cb,
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task);
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}
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}
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void
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meta_selection_transfer_async (MetaSelection *selection,
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MetaSelectionType selection_type,
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const char *mimetype,
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gssize size,
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GOutputStream *output,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GTask *task;
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g_return_if_fail (META_IS_SELECTION (selection));
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g_return_if_fail (selection_type < META_N_SELECTION_TYPES);
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g_return_if_fail (G_IS_OUTPUT_STREAM (output));
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g_return_if_fail (mimetype != NULL);
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task = g_task_new (selection, cancellable, callback, user_data);
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g_task_set_source_tag (task, meta_selection_transfer_async);
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g_task_set_task_data (task,
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transfer_request_new (output, selection_type, size),
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(GDestroyNotify) transfer_request_free);
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meta_selection_source_read_async (selection->owners[selection_type],
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mimetype,
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cancellable,
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(GAsyncReadyCallback) source_read_cb,
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task);
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}
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gboolean
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meta_selection_transfer_finish (MetaSelection *selection,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (g_task_is_valid (result, selection), FALSE);
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g_return_val_if_fail (g_task_get_source_tag (G_TASK (result)) ==
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meta_selection_transfer_async, FALSE);
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return g_task_propagate_boolean (G_TASK (result), error);
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}
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