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gtk2/gtk/gtkclipboard.c
Emmanuele Bassi 5880d1b990 gtk: Cast static strings assigned to non-const variables 
GtkTargetEntry.target is particularly egregious, and it should really be
constified.
2016-10-17 11:44:10 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2000 Red Hat, Inc.
* Copyright (C) 2004 Nokia Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Global clipboard abstraction.
*/
#include "config.h"
#include <string.h>
#include "gtkclipboard.h"
#include "gtkclipboardprivate.h"
#include "gtkinvisible.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtktextbufferrichtext.h"
#include "gtkintl.h"
#ifdef GDK_WINDOWING_X11
#include "x11/gdkx.h"
#endif
#ifdef GDK_WINDOWING_BROADWAY
#include "broadway/gdkbroadway.h"
#endif
#ifdef GDK_WINDOWING_WIN32
#include "win32/gdkwin32.h"
#endif
/**
* SECTION:gtkclipboard
* @Short_description: Storing data on clipboards
* @Title: Clipboards
* @See_also: #GtkSelectionData
*
* The #GtkClipboard object represents a clipboard of data shared
* between different processes or between different widgets in
* the same process. Each clipboard is identified by a name encoded as a
* #GdkAtom. (Conversion to and from strings can be done with
* gdk_atom_intern() and gdk_atom_name().) The default clipboard
* corresponds to the “CLIPBOARD” atom; another commonly used clipboard
* is the “PRIMARY” clipboard, which, in X, traditionally contains
* the currently selected text.
*
* To support having a number of different formats on the clipboard
* at the same time, the clipboard mechanism allows providing
* callbacks instead of the actual data. When you set the contents
* of the clipboard, you can either supply the data directly (via
* functions like gtk_clipboard_set_text()), or you can supply a
* callback to be called at a later time when the data is needed (via
* gtk_clipboard_set_with_data() or gtk_clipboard_set_with_owner().)
* Providing a callback also avoids having to make copies of the data
* when it is not needed.
*
* gtk_clipboard_set_with_data() and gtk_clipboard_set_with_owner()
* are quite similar; the choice between the two depends mostly on
* which is more convenient in a particular situation.
* The former is most useful when you want to have a blob of data
* with callbacks to convert it into the various data types that you
* advertise. When the @clear_func you provided is called, you
* simply free the data blob. The latter is more useful when the
* contents of clipboard reflect the internal state of a #GObject
* (As an example, for the PRIMARY clipboard, when an entry widget
* provides the clipboard’s contents the contents are simply the
* text within the selected region.) If the contents change, the
* entry widget can call gtk_clipboard_set_with_owner() to update
* the timestamp for clipboard ownership, without having to worry
* about @clear_func being called.
*
* Requesting the data from the clipboard is essentially
* asynchronous. If the contents of the clipboard are provided within
* the same process, then a direct function call will be made to
* retrieve the data, but if they are provided by another process,
* then the data needs to be retrieved from the other process, which
* may take some time. To avoid blocking the user interface, the call
* to request the selection, gtk_clipboard_request_contents() takes a
* callback that will be called when the contents are received (or
* when the request fails.) If you don’t want to deal with providing
* a separate callback, you can also use gtk_clipboard_wait_for_contents().
* What this does is run the GLib main loop recursively waiting for
* the contents. This can simplify the code flow, but you still have
* to be aware that other callbacks in your program can be called
* while this recursive mainloop is running.
*
* Along with the functions to get the clipboard contents as an
* arbitrary data chunk, there are also functions to retrieve
* it as text, gtk_clipboard_request_text() and
* gtk_clipboard_wait_for_text(). These functions take care of
* determining which formats are advertised by the clipboard
* provider, asking for the clipboard in the best available format
* and converting the results into the UTF-8 encoding. (The standard
* form for representing strings in GTK+.)
*/
enum {
OWNER_CHANGE,
LAST_SIGNAL
};
typedef struct _RequestContentsInfo RequestContentsInfo;
typedef struct _RequestTextInfo RequestTextInfo;
typedef struct _RequestRichTextInfo RequestRichTextInfo;
typedef struct _RequestImageInfo RequestImageInfo;
typedef struct _RequestURIInfo RequestURIInfo;
typedef struct _RequestTargetsInfo RequestTargetsInfo;
struct _RequestContentsInfo
{
GtkClipboardReceivedFunc callback;
gpointer user_data;
};
struct _RequestTextInfo
{
GtkClipboardTextReceivedFunc callback;
gpointer user_data;
};
struct _RequestRichTextInfo
{
GtkClipboardRichTextReceivedFunc callback;
GdkAtom *atoms;
gint n_atoms;
gint current_atom;
gpointer user_data;
};
struct _RequestImageInfo
{
GtkClipboardImageReceivedFunc callback;
gpointer user_data;
};
struct _RequestURIInfo
{
GtkClipboardURIReceivedFunc callback;
gpointer user_data;
};
struct _RequestTargetsInfo
{
GtkClipboardTargetsReceivedFunc callback;
gpointer user_data;
};
static void gtk_clipboard_finalize (GObject *object);
static void gtk_clipboard_owner_change (GtkClipboard *clipboard,
GdkEventOwnerChange *event);
static gboolean gtk_clipboard_set_contents (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
guint n_targets,
GtkClipboardGetFunc get_func,
GtkClipboardClearFunc clear_func,
gpointer user_data,
gboolean have_owner);
static void gtk_clipboard_real_clear (GtkClipboard *clipboard);
static void gtk_clipboard_real_request_contents (GtkClipboard *clipboard,
GdkAtom target,
GtkClipboardReceivedFunc callback,
gpointer user_data);
static void gtk_clipboard_real_set_can_store (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
gint n_targets);
static void gtk_clipboard_real_store (GtkClipboard *clipboard);
static void clipboard_unset (GtkClipboard *clipboard);
static void selection_received (GtkWidget *widget,
GtkSelectionData *selection_data,
guint time);
static GtkClipboard *clipboard_peek (GdkDisplay *display,
GdkAtom selection,
gboolean only_if_exists);
static GtkWidget * get_clipboard_widget (GdkDisplay *display);
enum {
TARGET_STRING,
TARGET_TEXT,
TARGET_COMPOUND_TEXT,
TARGET_UTF8_STRING,
TARGET_SAVE_TARGETS
};
static const gchar request_contents_key[] = "gtk-request-contents";
static GQuark request_contents_key_id = 0;
static const gchar clipboards_owned_key[] = "gtk-clipboards-owned";
static GQuark clipboards_owned_key_id = 0;
static guint clipboard_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE (GtkClipboard, gtk_clipboard, G_TYPE_OBJECT)
static void
gtk_clipboard_init (GtkClipboard *object)
{
}
static void
gtk_clipboard_class_init (GtkClipboardClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
gobject_class->finalize = gtk_clipboard_finalize;
class->set_contents = gtk_clipboard_set_contents;
class->clear = gtk_clipboard_real_clear;
class->request_contents = gtk_clipboard_real_request_contents;
class->set_can_store = gtk_clipboard_real_set_can_store;
class->store = gtk_clipboard_real_store;
class->owner_change = gtk_clipboard_owner_change;
/**
* GtkClipboard::owner-change:
* @clipboard: the #GtkClipboard on which the signal is emitted
* @event: (type Gdk.EventOwnerChange): the @GdkEventOwnerChange event
*
* The ::owner-change signal is emitted when GTK+ receives an
* event that indicates that the ownership of the selection
* associated with @clipboard has changed.
*
* Since: 2.6
*/
clipboard_signals[OWNER_CHANGE] =
g_signal_new (I_("owner-change"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkClipboardClass, owner_change),
NULL, NULL,
NULL,
G_TYPE_NONE, 1,
GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
}
static void
gtk_clipboard_finalize (GObject *object)
{
GtkClipboard *clipboard;
GtkWidget *clipboard_widget = NULL;
GSList *clipboards = NULL;
clipboard = GTK_CLIPBOARD (object);
if (clipboard->display)
{
clipboards = g_object_get_data (G_OBJECT (clipboard->display), "gtk-clipboard-list");
if (g_slist_index (clipboards, clipboard) >= 0)
g_warning ("GtkClipboard prematurely finalized");
clipboards = g_slist_remove (clipboards, clipboard);
g_object_set_data (G_OBJECT (clipboard->display), "gtk-clipboard-list",
clipboards);
/* don't use get_clipboard_widget() here because it would create the
* widget if it doesn't exist.
*/
clipboard_widget = g_object_get_data (G_OBJECT (clipboard->display),
"gtk-clipboard-widget");
}
clipboard_unset (clipboard);
if (clipboard->store_loop && g_main_loop_is_running (clipboard->store_loop))
g_main_loop_quit (clipboard->store_loop);
if (clipboard->store_timeout != 0)
g_source_remove (clipboard->store_timeout);
if (clipboard_widget != NULL && clipboard->notify_signal_id != 0)
g_signal_handler_disconnect (clipboard_widget, clipboard->notify_signal_id);
g_free (clipboard->storable_targets);
g_free (clipboard->cached_targets);
G_OBJECT_CLASS (gtk_clipboard_parent_class)->finalize (object);
}
static void
clipboard_display_closed (GdkDisplay *display,
gboolean is_error,
GtkClipboard *clipboard)
{
GSList *clipboards;
clipboards = g_object_get_data (G_OBJECT (display), "gtk-clipboard-list");
g_object_run_dispose (G_OBJECT (clipboard));
clipboards = g_slist_remove (clipboards, clipboard);
g_object_set_data (G_OBJECT (display), I_("gtk-clipboard-list"), clipboards);
g_object_unref (clipboard);
}
/**
* gtk_clipboard_get_for_display:
* @display: the #GdkDisplay for which the clipboard is to be retrieved or created.
* @selection: a #GdkAtom which identifies the clipboard to use.
*
* Returns the clipboard object for the given selection.
* Cut/copy/paste menu items and keyboard shortcuts should use
* the default clipboard, returned by passing %GDK_SELECTION_CLIPBOARD for @selection.
* (%GDK_NONE is supported as a synonym for GDK_SELECTION_CLIPBOARD
* for backwards compatibility reasons.)
* The currently-selected object or text should be provided on the clipboard
* identified by #GDK_SELECTION_PRIMARY. Cut/copy/paste menu items
* conceptually copy the contents of the #GDK_SELECTION_PRIMARY clipboard
* to the default clipboard, i.e. they copy the selection to what the
* user sees as the clipboard.
*
* (Passing #GDK_NONE is the same as using `gdk_atom_intern
* ("CLIPBOARD", FALSE)`.
*
* See the
* [FreeDesktop Clipboard Specification](http://www.freedesktop.org/Standards/clipboards-spec)
* for a detailed discussion of the “CLIPBOARD” vs. “PRIMARY”
* selections under the X window system. On Win32 the
* #GDK_SELECTION_PRIMARY clipboard is essentially ignored.)
*
* It’s possible to have arbitrary named clipboards; if you do invent
* new clipboards, you should prefix the selection name with an
* underscore (because the ICCCM requires that nonstandard atoms are
* underscore-prefixed), and namespace it as well. For example,
* if your application called “Foo” has a special-purpose
* clipboard, you might call it “_FOO_SPECIAL_CLIPBOARD”.
*
* Returns: (transfer none): the appropriate clipboard object. If no
* clipboard already exists, a new one will be created. Once a clipboard
* object has been created, it is persistent and, since it is owned by
* GTK+, must not be freed or unrefd.
*
* Since: 2.2
**/
GtkClipboard *
gtk_clipboard_get_for_display (GdkDisplay *display,
GdkAtom selection)
{
g_return_val_if_fail (display != NULL, NULL); /* See bgo#463773; this is needed because Flash Player sucks */
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
g_return_val_if_fail (!gdk_display_is_closed (display), NULL);
return clipboard_peek (display, selection, FALSE);
}
/**
* gtk_clipboard_get:
* @selection: a #GdkAtom which identifies the clipboard to use
*
* Returns the clipboard object for the given selection.
* See gtk_clipboard_get_for_display() for complete details.
*
* Returns: (transfer none): the appropriate clipboard object. If no clipboard
* already exists, a new one will be created. Once a clipboard
* object has been created, it is persistent and, since it is
* owned by GTK+, must not be freed or unreffed.
*/
GtkClipboard *
gtk_clipboard_get (GdkAtom selection)
{
return gtk_clipboard_get_for_display (gdk_display_get_default (), selection);
}
/**
* gtk_clipboard_get_default:
* @display: the #GdkDisplay for which the clipboard is to be retrieved.
*
* Returns the default clipboard object for use with cut/copy/paste menu items
* and keyboard shortcuts.
*
* Return value: (transfer none): the default clipboard object.
*
* Since: 3.16
**/
GtkClipboard *
gtk_clipboard_get_default (GdkDisplay *display)
{
g_return_val_if_fail (display != NULL, NULL);
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
return gtk_clipboard_get_for_display (display, GDK_SELECTION_CLIPBOARD);
}
static void
selection_get_cb (GtkWidget *widget,
GtkSelectionData *selection_data,
guint info,
guint time)
{
GtkClipboard *clipboard;
clipboard = gtk_widget_get_clipboard (widget,
gtk_selection_data_get_selection (selection_data));
if (clipboard && clipboard->get_func)
clipboard->get_func (clipboard, selection_data, info, clipboard->user_data);
}
static gboolean
selection_clear_event_cb (GtkWidget *widget,
GdkEventSelection *event)
{
GtkClipboard *clipboard = gtk_widget_get_clipboard (widget, event->selection);
if (clipboard)
{
clipboard_unset (clipboard);
return TRUE;
}
return FALSE;
}
static GtkWidget *
make_clipboard_widget (GdkDisplay *display,
gboolean provider)
{
GtkWidget *widget = gtk_invisible_new_for_screen (gdk_display_get_default_screen (display));
g_signal_connect (widget, "selection-received",
G_CALLBACK (selection_received), NULL);
if (provider)
{
/* We need this for gdk_x11_get_server_time() */
gtk_widget_add_events (widget, GDK_PROPERTY_CHANGE_MASK);
g_signal_connect (widget, "selection-get",
G_CALLBACK (selection_get_cb), NULL);
g_signal_connect (widget, "selection-clear-event",
G_CALLBACK (selection_clear_event_cb), NULL);
}
return widget;
}
static GtkWidget *
get_clipboard_widget (GdkDisplay *display)
{
GtkWidget *clip_widget = g_object_get_data (G_OBJECT (display), "gtk-clipboard-widget");
if (!clip_widget)
{
clip_widget = make_clipboard_widget (display, TRUE);
g_object_set_data (G_OBJECT (display), I_("gtk-clipboard-widget"), clip_widget);
}
return clip_widget;
}
/* This function makes a very good guess at what the correct
* timestamp for a selection request should be. If there is
* a currently processed event, it uses the timestamp for that
* event, otherwise it uses the current server time. However,
* if the time resulting from that is older than the time used
* last time, it uses the time used last time instead.
*
* In order implement this correctly, we never use CurrentTime,
* but actually retrieve the actual timestamp from the server.
* This is a little slower but allows us to make the guarantee
* that the times used by this application will always ascend
* and we won’t get selections being rejected just because
* we are using a correct timestamp from an event, but used
* CurrentTime previously.
*/
static guint32
clipboard_get_timestamp (GtkClipboard *clipboard)
{
GtkWidget *clipboard_widget = get_clipboard_widget (clipboard->display);
guint32 timestamp = gtk_get_current_event_time ();
GdkWindow *window;
if (timestamp == GDK_CURRENT_TIME)
{
window = gtk_widget_get_window (clipboard_widget);
#ifdef GDK_WINDOWING_X11
if (GDK_IS_X11_WINDOW (window))
{
timestamp = gdk_x11_get_server_time (gtk_widget_get_window (clipboard_widget));
}
else
#endif
#if defined GDK_WINDOWING_WIN32
if (GDK_IS_WIN32_WINDOW (window))
{
timestamp = GetMessageTime ();
}
else
#endif
#if defined GDK_WINDOWING_BROADWAY
if (GDK_IS_BROADWAY_WINDOW (window))
{
timestamp = gdk_broadway_get_last_seen_time (window);
}
else
#endif
{
/* No implementation */
}
}
else
{
if (clipboard->timestamp != GDK_CURRENT_TIME)
{
/* Check to see if clipboard->timestamp is newer than
* timestamp, accounting for wraparound.
*/
guint32 max = timestamp + 0x80000000;
if ((max > timestamp &&
(clipboard->timestamp > timestamp &&
clipboard->timestamp <= max)) ||
(max <= timestamp &&
(clipboard->timestamp > timestamp ||
clipboard->timestamp <= max)))
{
timestamp = clipboard->timestamp;
}
}
}
clipboard->timestamp = timestamp;
return timestamp;
}
static void
clipboard_owner_destroyed (gpointer data)
{
GSList *clipboards = data;
GSList *tmp_list;
tmp_list = clipboards;
while (tmp_list)
{
GtkClipboard *clipboard = tmp_list->data;
clipboard->get_func = NULL;
clipboard->clear_func = NULL;
clipboard->user_data = NULL;
clipboard->have_owner = FALSE;
gtk_clipboard_clear (clipboard);
tmp_list = tmp_list->next;
}
g_slist_free (clipboards);
}
static void
clipboard_add_owner_notify (GtkClipboard *clipboard)
{
if (!clipboards_owned_key_id)
clipboards_owned_key_id = g_quark_from_static_string (clipboards_owned_key);
if (clipboard->have_owner)
g_object_set_qdata_full (clipboard->user_data, clipboards_owned_key_id,
g_slist_prepend (g_object_steal_qdata (clipboard->user_data,
clipboards_owned_key_id),
clipboard),
clipboard_owner_destroyed);
}
static void
clipboard_remove_owner_notify (GtkClipboard *clipboard)
{
if (clipboard->have_owner)
g_object_set_qdata_full (clipboard->user_data, clipboards_owned_key_id,
g_slist_remove (g_object_steal_qdata (clipboard->user_data,
clipboards_owned_key_id),
clipboard),
clipboard_owner_destroyed);
}
static gboolean
gtk_clipboard_set_contents (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
guint n_targets,
GtkClipboardGetFunc get_func,
GtkClipboardClearFunc clear_func,
gpointer user_data,
gboolean have_owner)
{
GtkWidget *clipboard_widget = get_clipboard_widget (clipboard->display);
if (gtk_selection_owner_set_for_display (clipboard->display,
clipboard_widget,
clipboard->selection,
clipboard_get_timestamp (clipboard)))
{
clipboard->have_selection = TRUE;
if (clipboard->n_cached_targets != -1)
{
g_free (clipboard->cached_targets);
clipboard->cached_targets = NULL;
clipboard->n_cached_targets = -1;
}
if (!(clipboard->have_owner && have_owner) ||
clipboard->user_data != user_data)
{
clipboard_unset (clipboard);
clipboard->user_data = user_data;
clipboard->have_owner = have_owner;
if (have_owner)
clipboard_add_owner_notify (clipboard);
}
clipboard->get_func = get_func;
clipboard->clear_func = clear_func;
gtk_selection_clear_targets (clipboard_widget, clipboard->selection);
gtk_selection_add_targets (clipboard_widget, clipboard->selection,
targets, n_targets);
return TRUE;
}
else
return FALSE;
}
/**
* gtk_clipboard_set_with_data: (skip)
* @clipboard: a #GtkClipboard
* @targets: (array length=n_targets): array containing information
* about the available forms for the clipboard data
* @n_targets: number of elements in @targets
* @get_func: (scope async): function to call to get the actual clipboard data
* @clear_func: (scope async): when the clipboard contents are set again,
* this function will be called, and @get_func will not be subsequently
* called.
* @user_data: user data to pass to @get_func and @clear_func.
*
* Virtually sets the contents of the specified clipboard by providing
* a list of supported formats for the clipboard data and a function
* to call to get the actual data when it is requested.
*
* Returns: %TRUE if setting the clipboard data succeeded.
* If setting the clipboard data failed the provided callback
* functions will be ignored.
**/
gboolean
gtk_clipboard_set_with_data (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
guint n_targets,
GtkClipboardGetFunc get_func,
GtkClipboardClearFunc clear_func,
gpointer user_data)
{
g_return_val_if_fail (clipboard != NULL, FALSE);
g_return_val_if_fail (targets != NULL, FALSE);
g_return_val_if_fail (get_func != NULL, FALSE);
return GTK_CLIPBOARD_GET_CLASS (clipboard)->set_contents (clipboard,
targets,
n_targets,
get_func,
clear_func,
user_data,
FALSE);
}
/**
* gtk_clipboard_set_with_owner: (skip)
* @clipboard: a #GtkClipboard
* @targets: (array length=n_targets): array containing information
* about the available forms for the clipboard data
* @n_targets: number of elements in @targets
* @get_func: (scope async): function to call to get the actual clipboard data
* @clear_func: (scope async): when the clipboard contents are set again,
* this function will be called, and @get_func will not be subsequently
* called
* @owner: an object that “owns” the data. This object will be passed
* to the callbacks when called
*
* Virtually sets the contents of the specified clipboard by providing
* a list of supported formats for the clipboard data and a function
* to call to get the actual data when it is requested.
*
* The difference between this function and gtk_clipboard_set_with_data()
* is that instead of an generic @user_data pointer, a #GObject is passed
* in.
*
* Returns: %TRUE if setting the clipboard data succeeded.
* If setting the clipboard data failed the provided callback
* functions will be ignored.
**/
gboolean
gtk_clipboard_set_with_owner (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
guint n_targets,
GtkClipboardGetFunc get_func,
GtkClipboardClearFunc clear_func,
GObject *owner)
{
g_return_val_if_fail (clipboard != NULL, FALSE);
g_return_val_if_fail (targets != NULL, FALSE);
g_return_val_if_fail (get_func != NULL, FALSE);
g_return_val_if_fail (G_IS_OBJECT (owner), FALSE);
return GTK_CLIPBOARD_GET_CLASS (clipboard)->set_contents (clipboard,
targets,
n_targets,
get_func,
clear_func,
owner,
TRUE);
}
/**
* gtk_clipboard_get_owner:
* @clipboard: a #GtkClipboard
*
* If the clipboard contents callbacks were set with
* gtk_clipboard_set_with_owner(), and the gtk_clipboard_set_with_data() or
* gtk_clipboard_clear() has not subsequently called, returns the owner set
* by gtk_clipboard_set_with_owner().
*
* Returns: (nullable) (transfer none): the owner of the clipboard, if any;
* otherwise %NULL.
**/
GObject *
gtk_clipboard_get_owner (GtkClipboard *clipboard)
{
g_return_val_if_fail (clipboard != NULL, NULL);
if (clipboard->have_owner)
return clipboard->user_data;
else
return NULL;
}
static void
clipboard_unset (GtkClipboard *clipboard)
{
GtkClipboardClearFunc old_clear_func;
gpointer old_data;
gboolean old_have_owner;
gint old_n_storable_targets;
old_clear_func = clipboard->clear_func;
old_data = clipboard->user_data;
old_have_owner = clipboard->have_owner;
old_n_storable_targets = clipboard->n_storable_targets;
if (old_have_owner)
{
clipboard_remove_owner_notify (clipboard);
clipboard->have_owner = FALSE;
}
clipboard->n_storable_targets = -1;
g_free (clipboard->storable_targets);
clipboard->storable_targets = NULL;
clipboard->get_func = NULL;
clipboard->clear_func = NULL;
clipboard->user_data = NULL;
if (old_clear_func)
old_clear_func (clipboard, old_data);
/* If we've transferred the clipboard data to the manager,
* unref the owner
*/
if (old_have_owner &&
old_n_storable_targets != -1)
g_object_unref (old_data);
}
/**
* gtk_clipboard_clear:
* @clipboard: a #GtkClipboard
*
* Clears the contents of the clipboard. Generally this should only
* be called between the time you call gtk_clipboard_set_with_owner()
* or gtk_clipboard_set_with_data(),
* and when the @clear_func you supplied is called. Otherwise, the
* clipboard may be owned by someone else.
**/
void
gtk_clipboard_clear (GtkClipboard *clipboard)
{
g_return_if_fail (clipboard != NULL);
GTK_CLIPBOARD_GET_CLASS (clipboard)->clear (clipboard);
}
static void
gtk_clipboard_real_clear (GtkClipboard *clipboard)
{
if (clipboard->have_selection)
gtk_selection_owner_set_for_display (clipboard->display,
NULL,
clipboard->selection,
clipboard_get_timestamp (clipboard));
}
static void
text_get_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
guint info,
gpointer data)
{
gtk_selection_data_set_text (selection_data, data, -1);
}
static void
text_clear_func (GtkClipboard *clipboard,
gpointer data)
{
g_free (data);
}
/**
* gtk_clipboard_set_text:
* @clipboard: a #GtkClipboard object
* @text: a UTF-8 string.
* @len: length of @text, in bytes, or -1, in which case
* the length will be determined with strlen().
*
* Sets the contents of the clipboard to the given UTF-8 string. GTK+ will
* make a copy of the text and take responsibility for responding
* for requests for the text, and for converting the text into
* the requested format.
**/
void
gtk_clipboard_set_text (GtkClipboard *clipboard,
const gchar *text,
gint len)
{
GtkTargetList *list;
GtkTargetEntry *targets;
gint n_targets;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (text != NULL);
list = gtk_target_list_new (NULL, 0);
gtk_target_list_add_text_targets (list, 0);
targets = gtk_target_table_new_from_list (list, &n_targets);
if (len < 0)
len = strlen (text);
gtk_clipboard_set_with_data (clipboard,
targets, n_targets,
text_get_func, text_clear_func,
g_strndup (text, len));
gtk_clipboard_set_can_store (clipboard, NULL, 0);
gtk_target_table_free (targets, n_targets);
gtk_target_list_unref (list);
}
static void
pixbuf_get_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
guint info,
gpointer data)
{
gtk_selection_data_set_pixbuf (selection_data, data);
}
static void
pixbuf_clear_func (GtkClipboard *clipboard,
gpointer data)
{
g_object_unref (data);
}
/**
* gtk_clipboard_set_image:
* @clipboard: a #GtkClipboard object
* @pixbuf: a #GdkPixbuf
*
* Sets the contents of the clipboard to the given #GdkPixbuf.
* GTK+ will take responsibility for responding for requests
* for the image, and for converting the image into the
* requested format.
*
* Since: 2.6
**/
void
gtk_clipboard_set_image (GtkClipboard *clipboard,
GdkPixbuf *pixbuf)
{
GtkTargetList *list;
GtkTargetEntry *targets;
gint n_targets;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
list = gtk_target_list_new (NULL, 0);
gtk_target_list_add_image_targets (list, 0, TRUE);
targets = gtk_target_table_new_from_list (list, &n_targets);
gtk_clipboard_set_with_data (clipboard,
targets, n_targets,
pixbuf_get_func, pixbuf_clear_func,
g_object_ref (pixbuf));
gtk_clipboard_set_can_store (clipboard, NULL, 0);
gtk_target_table_free (targets, n_targets);
gtk_target_list_unref (list);
}
static void
set_request_contents_info (GtkWidget *widget,
RequestContentsInfo *info)
{
if (!request_contents_key_id)
request_contents_key_id = g_quark_from_static_string (request_contents_key);
g_object_set_qdata (G_OBJECT (widget), request_contents_key_id, info);
}
static RequestContentsInfo *
get_request_contents_info (GtkWidget *widget)
{
if (!request_contents_key_id)
return NULL;
else
return g_object_get_qdata (G_OBJECT (widget), request_contents_key_id);
}
static void
selection_received (GtkWidget *widget,
GtkSelectionData *selection_data,
guint time)
{
RequestContentsInfo *request_info = get_request_contents_info (widget);
set_request_contents_info (widget, NULL);
request_info->callback (gtk_widget_get_clipboard (widget, gtk_selection_data_get_selection (selection_data)),
selection_data,
request_info->user_data);
g_free (request_info);
if (widget != get_clipboard_widget (gtk_widget_get_display (widget)))
gtk_widget_destroy (widget);
}
/**
* gtk_clipboard_request_contents:
* @clipboard: a #GtkClipboard
* @target: an atom representing the form into which the clipboard
* owner should convert the selection.
* @callback: (scope async): A function to call when the results are received
* (or the retrieval fails). If the retrieval fails the length field of
* @selection_data will be negative.
* @user_data: user data to pass to @callback
*
* Requests the contents of clipboard as the given target.
* When the results of the result are later received the supplied callback
* will be called.
**/
void
gtk_clipboard_request_contents (GtkClipboard *clipboard,
GdkAtom target,
GtkClipboardReceivedFunc callback,
gpointer user_data)
{
g_return_if_fail (clipboard != NULL);
g_return_if_fail (target != GDK_NONE);
g_return_if_fail (callback != NULL);
GTK_CLIPBOARD_GET_CLASS (clipboard)->request_contents (clipboard,
target,
callback,
user_data);
}
static void
gtk_clipboard_real_request_contents (GtkClipboard *clipboard,
GdkAtom target,
GtkClipboardReceivedFunc callback,
gpointer user_data)
{
RequestContentsInfo *info;
GtkWidget *widget;
GtkWidget *clipboard_widget;
clipboard_widget = get_clipboard_widget (clipboard->display);
if (get_request_contents_info (clipboard_widget))
widget = make_clipboard_widget (clipboard->display, FALSE);
else
widget = clipboard_widget;
info = g_new (RequestContentsInfo, 1);
info->callback = callback;
info->user_data = user_data;
set_request_contents_info (widget, info);
gtk_selection_convert (widget, clipboard->selection, target,
clipboard_get_timestamp (clipboard));
}
static void
request_text_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
RequestTextInfo *info = data;
gchar *result = NULL;
result = (gchar *) gtk_selection_data_get_text (selection_data);
if (!result)
{
/* If we asked for UTF8 and didn't get it, try compound_text;
* if we asked for compound_text and didn't get it, try string;
* If we asked for anything else and didn't get it, give up.
*/
GdkAtom target = gtk_selection_data_get_target (selection_data);
if (target == gdk_atom_intern_static_string ("UTF8_STRING"))
{
gtk_clipboard_request_contents (clipboard,
gdk_atom_intern_static_string ("COMPOUND_TEXT"),
request_text_received_func, info);
return;
}
else if (target == gdk_atom_intern_static_string ("COMPOUND_TEXT"))
{
gtk_clipboard_request_contents (clipboard,
GDK_TARGET_STRING,
request_text_received_func, info);
return;
}
}
info->callback (clipboard, result, info->user_data);
g_free (info);
g_free (result);
}
/**
* gtk_clipboard_request_text:
* @clipboard: a #GtkClipboard
* @callback: (scope async): a function to call when the text is received,
* or the retrieval fails. (It will always be called one way or the other.)
* @user_data: user data to pass to @callback.
*
* Requests the contents of the clipboard as text. When the text is
* later received, it will be converted to UTF-8 if necessary, and
* @callback will be called.
*
* The @text parameter to @callback will contain the resulting text if
* the request succeeded, or %NULL if it failed. This could happen for
* various reasons, in particular if the clipboard was empty or if the
* contents of the clipboard could not be converted into text form.
**/
void
gtk_clipboard_request_text (GtkClipboard *clipboard,
GtkClipboardTextReceivedFunc callback,
gpointer user_data)
{
RequestTextInfo *info;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (callback != NULL);
info = g_new (RequestTextInfo, 1);
info->callback = callback;
info->user_data = user_data;
gtk_clipboard_request_contents (clipboard, gdk_atom_intern_static_string ("UTF8_STRING"),
request_text_received_func,
info);
}
static void
request_rich_text_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
RequestRichTextInfo *info = data;
guint8 *result = NULL;
gsize length = 0;
result = (guint8 *) gtk_selection_data_get_data (selection_data);
length = gtk_selection_data_get_length (selection_data);
info->current_atom++;
if ((!result || length < 1) && (info->current_atom < info->n_atoms))
{
gtk_clipboard_request_contents (clipboard, info->atoms[info->current_atom],
request_rich_text_received_func,
info);
return;
}
info->callback (clipboard, gtk_selection_data_get_target (selection_data),
result, length,
info->user_data);
g_free (info->atoms);
g_free (info);
}
/**
* gtk_clipboard_request_rich_text:
* @clipboard: a #GtkClipboard
* @buffer: a #GtkTextBuffer
* @callback: (scope async): a function to call when the text is received,
* or the retrieval fails. (It will always be called one way or the other.)
* @user_data: user data to pass to @callback.
*
* Requests the contents of the clipboard as rich text. When the rich
* text is later received, @callback will be called.
*
* The @text parameter to @callback will contain the resulting rich
* text if the request succeeded, or %NULL if it failed. The @length
* parameter will contain @text’s length. This function can fail for
* various reasons, in particular if the clipboard was empty or if the
* contents of the clipboard could not be converted into rich text form.
*
* Since: 2.10
**/
void
gtk_clipboard_request_rich_text (GtkClipboard *clipboard,
GtkTextBuffer *buffer,
GtkClipboardRichTextReceivedFunc callback,
gpointer user_data)
{
RequestRichTextInfo *info;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
g_return_if_fail (callback != NULL);
info = g_new (RequestRichTextInfo, 1);
info->callback = callback;
info->atoms = NULL;
info->n_atoms = 0;
info->current_atom = 0;
info->user_data = user_data;
info->atoms = gtk_text_buffer_get_deserialize_formats (buffer, &info->n_atoms);
gtk_clipboard_request_contents (clipboard, info->atoms[info->current_atom],
request_rich_text_received_func,
info);
}
static void
request_image_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
RequestImageInfo *info = data;
GdkPixbuf *result = NULL;
result = gtk_selection_data_get_pixbuf (selection_data);
if (!result)
{
/* If we asked for image/png and didn't get it, try image/jpeg;
* if we asked for image/jpeg and didn't get it, try image/gif;
* if we asked for image/gif and didn't get it, try image/bmp;
* If we asked for anything else and didn't get it, give up.
*/
GdkAtom target = gtk_selection_data_get_target (selection_data);
if (target == gdk_atom_intern_static_string ("image/png"))
{
gtk_clipboard_request_contents (clipboard,
gdk_atom_intern_static_string ("image/jpeg"),
request_image_received_func, info);
return;
}
else if (target == gdk_atom_intern_static_string ("image/jpeg"))
{
gtk_clipboard_request_contents (clipboard,
gdk_atom_intern_static_string ("image/gif"),
request_image_received_func, info);
return;
}
else if (target == gdk_atom_intern_static_string ("image/gif"))
{
gtk_clipboard_request_contents (clipboard,
gdk_atom_intern_static_string ("image/bmp"),
request_image_received_func, info);
return;
}
}
info->callback (clipboard, result, info->user_data);
g_free (info);
if (result)
g_object_unref (result);
}
/**
* gtk_clipboard_request_image:
* @clipboard: a #GtkClipboard
* @callback: (scope async): a function to call when the image is received,
* or the retrieval fails. (It will always be called one way or the other.)
* @user_data: user data to pass to @callback.
*
* Requests the contents of the clipboard as image. When the image is
* later received, it will be converted to a #GdkPixbuf, and
* @callback will be called.
*
* The @pixbuf parameter to @callback will contain the resulting
* #GdkPixbuf if the request succeeded, or %NULL if it failed. This
* could happen for various reasons, in particular if the clipboard
* was empty or if the contents of the clipboard could not be
* converted into an image.
*
* Since: 2.6
**/
void
gtk_clipboard_request_image (GtkClipboard *clipboard,
GtkClipboardImageReceivedFunc callback,
gpointer user_data)
{
RequestImageInfo *info;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (callback != NULL);
info = g_new (RequestImageInfo, 1);
info->callback = callback;
info->user_data = user_data;
gtk_clipboard_request_contents (clipboard,
gdk_atom_intern_static_string ("image/png"),
request_image_received_func,
info);
}
static void
request_uris_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
RequestURIInfo *info = data;
gchar **uris;
uris = gtk_selection_data_get_uris (selection_data);
info->callback (clipboard, uris, info->user_data);
g_strfreev (uris);
g_slice_free (RequestURIInfo, info);
}
/**
* gtk_clipboard_request_uris:
* @clipboard: a #GtkClipboard
* @callback: (scope async): a function to call when the URIs are received,
* or the retrieval fails. (It will always be called one way or the other.)
* @user_data: user data to pass to @callback.
*
* Requests the contents of the clipboard as URIs. When the URIs are
* later received @callback will be called.
*
* The @uris parameter to @callback will contain the resulting array of
* URIs if the request succeeded, or %NULL if it failed. This could happen
* for various reasons, in particular if the clipboard was empty or if the
* contents of the clipboard could not be converted into URI form.
*
* Since: 2.14
**/
void
gtk_clipboard_request_uris (GtkClipboard *clipboard,
GtkClipboardURIReceivedFunc callback,
gpointer user_data)
{
RequestURIInfo *info;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (callback != NULL);
info = g_slice_new (RequestURIInfo);
info->callback = callback;
info->user_data = user_data;
gtk_clipboard_request_contents (clipboard, gdk_atom_intern_static_string ("text/uri-list"),
request_uris_received_func,
info);
}
static void
request_targets_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
RequestTargetsInfo *info = data;
GdkAtom *targets = NULL;
gint n_targets = 0;
gtk_selection_data_get_targets (selection_data, &targets, &n_targets);
info->callback (clipboard, targets, n_targets, info->user_data);
g_free (info);
g_free (targets);
}
/**
* gtk_clipboard_request_targets:
* @clipboard: a #GtkClipboard
* @callback: (scope async): a function to call when the targets are
* received, or the retrieval fails. (It will always be called
* one way or the other.)
* @user_data: user data to pass to @callback.
*
* Requests the contents of the clipboard as list of supported targets.
* When the list is later received, @callback will be called.
*
* The @targets parameter to @callback will contain the resulting targets if
* the request succeeded, or %NULL if it failed.
*
* Since: 2.4
**/
void
gtk_clipboard_request_targets (GtkClipboard *clipboard,
GtkClipboardTargetsReceivedFunc callback,
gpointer user_data)
{
RequestTargetsInfo *info;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (callback != NULL);
/* If the display supports change notification we cache targets */
if (gdk_display_supports_selection_notification (gtk_clipboard_get_display (clipboard)) &&
clipboard->n_cached_targets != -1)
{
(* callback) (clipboard, clipboard->cached_targets, clipboard->n_cached_targets, user_data);
return;
}
info = g_new (RequestTargetsInfo, 1);
info->callback = callback;
info->user_data = user_data;
gtk_clipboard_request_contents (clipboard, gdk_atom_intern_static_string ("TARGETS"),
request_targets_received_func,
info);
}
typedef struct
{
GMainLoop *loop;
gpointer data;
GdkAtom format; /* used by rich text */
gsize length; /* used by rich text */
} WaitResults;
static void
clipboard_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
WaitResults *results = data;
if (gtk_selection_data_get_length (selection_data) >= 0)
results->data = gtk_selection_data_copy (selection_data);
g_main_loop_quit (results->loop);
}
/**
* gtk_clipboard_wait_for_contents:
* @clipboard: a #GtkClipboard
* @target: an atom representing the form into which the clipboard
* owner should convert the selection.
*
* Requests the contents of the clipboard using the given target.
* This function waits for the data to be received using the main
* loop, so events, timeouts, etc, may be dispatched during the wait.
*
* Returns: (nullable): a newly-allocated #GtkSelectionData object or %NULL
* if retrieving the given target failed. If non-%NULL,
* this value must be freed with gtk_selection_data_free()
* when you are finished with it.
**/
GtkSelectionData *
gtk_clipboard_wait_for_contents (GtkClipboard *clipboard,
GdkAtom target)
{
WaitResults results;
g_return_val_if_fail (clipboard != NULL, NULL);
g_return_val_if_fail (target != GDK_NONE, NULL);
results.data = NULL;
results.loop = g_main_loop_new (NULL, TRUE);
gtk_clipboard_request_contents (clipboard, target,
clipboard_received_func,
&results);
if (g_main_loop_is_running (results.loop))
{
gdk_threads_leave ();
g_main_loop_run (results.loop);
gdk_threads_enter ();
}
g_main_loop_unref (results.loop);
return results.data;
}
static void
clipboard_text_received_func (GtkClipboard *clipboard,
const gchar *text,
gpointer data)
{
WaitResults *results = data;
results->data = g_strdup (text);
g_main_loop_quit (results->loop);
}
/**
* gtk_clipboard_wait_for_text:
* @clipboard: a #GtkClipboard
*
* Requests the contents of the clipboard as text and converts
* the result to UTF-8 if necessary. This function waits for
* the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* Returns: (nullable): a newly-allocated UTF-8 string which must
* be freed with g_free(), or %NULL if retrieving
* the selection data failed. (This could happen
* for various reasons, in particular if the
* clipboard was empty or if the contents of the
* clipboard could not be converted into text form.)
**/
gchar *
gtk_clipboard_wait_for_text (GtkClipboard *clipboard)
{
WaitResults results;
g_return_val_if_fail (clipboard != NULL, NULL);
results.data = NULL;
results.loop = g_main_loop_new (NULL, TRUE);
gtk_clipboard_request_text (clipboard,
clipboard_text_received_func,
&results);
if (g_main_loop_is_running (results.loop))
{
gdk_threads_leave ();
g_main_loop_run (results.loop);
gdk_threads_enter ();
}
g_main_loop_unref (results.loop);
return results.data;
}
static void
clipboard_rich_text_received_func (GtkClipboard *clipboard,
GdkAtom format,
const guint8 *text,
gsize length,
gpointer data)
{
WaitResults *results = data;
results->data = g_memdup (text, length);
results->format = format;
results->length = length;
g_main_loop_quit (results->loop);
}
/**
* gtk_clipboard_wait_for_rich_text:
* @clipboard: a #GtkClipboard
* @buffer: a #GtkTextBuffer
* @format: (out): return location for the format of the returned data
* @length: (out): return location for the length of the returned data
*
* Requests the contents of the clipboard as rich text. This function
* waits for the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* Returns: (nullable) (array length=length) (transfer full): a
* newly-allocated binary block of data which must be
* freed with g_free(), or %NULL if retrieving the
* selection data failed. (This could happen for various
* reasons, in particular if the clipboard was empty or
* if the contents of the clipboard could not be
* converted into text form.)
*
* Since: 2.10
**/
guint8 *
gtk_clipboard_wait_for_rich_text (GtkClipboard *clipboard,
GtkTextBuffer *buffer,
GdkAtom *format,
gsize *length)
{
WaitResults results;
g_return_val_if_fail (clipboard != NULL, NULL);
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
g_return_val_if_fail (format != NULL, NULL);
g_return_val_if_fail (length != NULL, NULL);
results.data = NULL;
results.loop = g_main_loop_new (NULL, TRUE);
gtk_clipboard_request_rich_text (clipboard, buffer,
clipboard_rich_text_received_func,
&results);
if (g_main_loop_is_running (results.loop))
{
gdk_threads_leave ();
g_main_loop_run (results.loop);
gdk_threads_enter ();
}
g_main_loop_unref (results.loop);
*format = results.format;
*length = results.length;
return results.data;
}
static void
clipboard_image_received_func (GtkClipboard *clipboard,
GdkPixbuf *pixbuf,
gpointer data)
{
WaitResults *results = data;
if (pixbuf)
results->data = g_object_ref (pixbuf);
g_main_loop_quit (results->loop);
}
/**
* gtk_clipboard_wait_for_image:
* @clipboard: a #GtkClipboard
*
* Requests the contents of the clipboard as image and converts
* the result to a #GdkPixbuf. This function waits for
* the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* Returns: (nullable) (transfer full): a newly-allocated #GdkPixbuf
* object which must be disposed with g_object_unref(), or
* %NULL if retrieving the selection data failed. (This could
* happen for various reasons, in particular if the clipboard
* was empty or if the contents of the clipboard could not be
* converted into an image.)
*
* Since: 2.6
**/
GdkPixbuf *
gtk_clipboard_wait_for_image (GtkClipboard *clipboard)
{
WaitResults results;
g_return_val_if_fail (clipboard != NULL, NULL);
results.data = NULL;
results.loop = g_main_loop_new (NULL, TRUE);
gtk_clipboard_request_image (clipboard,
clipboard_image_received_func,
&results);
if (g_main_loop_is_running (results.loop))
{
gdk_threads_leave ();
g_main_loop_run (results.loop);
gdk_threads_enter ();
}
g_main_loop_unref (results.loop);
return results.data;
}
static void
clipboard_uris_received_func (GtkClipboard *clipboard,
gchar **uris,
gpointer data)
{
WaitResults *results = data;
results->data = g_strdupv (uris);
g_main_loop_quit (results->loop);
}
/**
* gtk_clipboard_wait_for_uris:
* @clipboard: a #GtkClipboard
*
* Requests the contents of the clipboard as URIs. This function waits
* for the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* Returns: (nullable) (array zero-terminated=1) (element-type utf8) (transfer full):
* a newly-allocated %NULL-terminated array of strings which must
* be freed with g_strfreev(), or %NULL if retrieving the
* selection data failed. (This could happen for various reasons,
* in particular if the clipboard was empty or if the contents of
* the clipboard could not be converted into URI form.)
*
* Since: 2.14
**/
gchar **
gtk_clipboard_wait_for_uris (GtkClipboard *clipboard)
{
WaitResults results;
g_return_val_if_fail (clipboard != NULL, NULL);
results.data = NULL;
results.loop = g_main_loop_new (NULL, TRUE);
gtk_clipboard_request_uris (clipboard,
clipboard_uris_received_func,
&results);
if (g_main_loop_is_running (results.loop))
{
gdk_threads_leave ();
g_main_loop_run (results.loop);
gdk_threads_enter ();
}
g_main_loop_unref (results.loop);
return results.data;
}
/**
* gtk_clipboard_get_display:
* @clipboard: a #GtkClipboard
*
* Gets the #GdkDisplay associated with @clipboard
*
* Returns: (transfer none): the #GdkDisplay associated with @clipboard
*
* Since: 2.2
**/
GdkDisplay *
gtk_clipboard_get_display (GtkClipboard *clipboard)
{
g_return_val_if_fail (clipboard != NULL, NULL);
return clipboard->display;
}
/**
* gtk_clipboard_wait_is_text_available:
* @clipboard: a #GtkClipboard
*
* Test to see if there is text available to be pasted
* This is done by requesting the TARGETS atom and checking
* if it contains any of the supported text targets. This function
* waits for the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* This function is a little faster than calling
* gtk_clipboard_wait_for_text() since it doesn’t need to retrieve
* the actual text.
*
* Returns: %TRUE is there is text available, %FALSE otherwise.
**/
gboolean
gtk_clipboard_wait_is_text_available (GtkClipboard *clipboard)
{
GtkSelectionData *data;
gboolean result = FALSE;
data = gtk_clipboard_wait_for_contents (clipboard, gdk_atom_intern_static_string ("TARGETS"));
if (data)
{
result = gtk_selection_data_targets_include_text (data);
gtk_selection_data_free (data);
}
return result;
}
/**
* gtk_clipboard_wait_is_rich_text_available:
* @clipboard: a #GtkClipboard
* @buffer: a #GtkTextBuffer
*
* Test to see if there is rich text available to be pasted
* This is done by requesting the TARGETS atom and checking
* if it contains any of the supported rich text targets. This function
* waits for the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* This function is a little faster than calling
* gtk_clipboard_wait_for_rich_text() since it doesn’t need to retrieve
* the actual text.
*
* Returns: %TRUE is there is rich text available, %FALSE otherwise.
*
* Since: 2.10
**/
gboolean
gtk_clipboard_wait_is_rich_text_available (GtkClipboard *clipboard,
GtkTextBuffer *buffer)
{
GtkSelectionData *data;
gboolean result = FALSE;
g_return_val_if_fail (GTK_IS_CLIPBOARD (clipboard), FALSE);
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), FALSE);
data = gtk_clipboard_wait_for_contents (clipboard, gdk_atom_intern_static_string ("TARGETS"));
if (data)
{
result = gtk_selection_data_targets_include_rich_text (data, buffer);
gtk_selection_data_free (data);
}
return result;
}
/**
* gtk_clipboard_wait_is_image_available:
* @clipboard: a #GtkClipboard
*
* Test to see if there is an image available to be pasted
* This is done by requesting the TARGETS atom and checking
* if it contains any of the supported image targets. This function
* waits for the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* This function is a little faster than calling
* gtk_clipboard_wait_for_image() since it doesn’t need to retrieve
* the actual image data.
*
* Returns: %TRUE is there is an image available, %FALSE otherwise.
*
* Since: 2.6
**/
gboolean
gtk_clipboard_wait_is_image_available (GtkClipboard *clipboard)
{
GtkSelectionData *data;
gboolean result = FALSE;
data = gtk_clipboard_wait_for_contents (clipboard,
gdk_atom_intern_static_string ("TARGETS"));
if (data)
{
result = gtk_selection_data_targets_include_image (data, FALSE);
gtk_selection_data_free (data);
}
return result;
}
/**
* gtk_clipboard_wait_is_uris_available:
* @clipboard: a #GtkClipboard
*
* Test to see if there is a list of URIs available to be pasted
* This is done by requesting the TARGETS atom and checking
* if it contains the URI targets. This function
* waits for the data to be received using the main loop, so events,
* timeouts, etc, may be dispatched during the wait.
*
* This function is a little faster than calling
* gtk_clipboard_wait_for_uris() since it doesn’t need to retrieve
* the actual URI data.
*
* Returns: %TRUE is there is an URI list available, %FALSE otherwise.
*
* Since: 2.14
**/
gboolean
gtk_clipboard_wait_is_uris_available (GtkClipboard *clipboard)
{
GtkSelectionData *data;
gboolean result = FALSE;
data = gtk_clipboard_wait_for_contents (clipboard,
gdk_atom_intern_static_string ("TARGETS"));
if (data)
{
result = gtk_selection_data_targets_include_uri (data);
gtk_selection_data_free (data);
}
return result;
}
/**
* gtk_clipboard_wait_for_targets:
* @clipboard: a #GtkClipboard
* @targets: (out) (array length=n_targets) (transfer container): location
* to store an array of targets. The result stored here must
* be freed with g_free().
* @n_targets: (out): location to store number of items in @targets.
*
* Returns a list of targets that are present on the clipboard, or %NULL
* if there aren’t any targets available. The returned list must be
* freed with g_free().
* This function waits for the data to be received using the main
* loop, so events, timeouts, etc, may be dispatched during the wait.
*
* Returns: %TRUE if any targets are present on the clipboard,
* otherwise %FALSE.
*
* Since: 2.4
*/
gboolean
gtk_clipboard_wait_for_targets (GtkClipboard *clipboard,
GdkAtom **targets,
gint *n_targets)
{
GtkSelectionData *data;
gboolean result = FALSE;
g_return_val_if_fail (clipboard != NULL, FALSE);
/* If the display supports change notification we cache targets */
if (gdk_display_supports_selection_notification (gtk_clipboard_get_display (clipboard)) &&
clipboard->n_cached_targets != -1)
{
if (n_targets)
*n_targets = clipboard->n_cached_targets;
if (targets)
*targets = g_memdup (clipboard->cached_targets,
clipboard->n_cached_targets * sizeof (GdkAtom));
return TRUE;
}
if (n_targets)
*n_targets = 0;
if (targets)
*targets = NULL;
data = gtk_clipboard_wait_for_contents (clipboard, gdk_atom_intern_static_string ("TARGETS"));
if (data)
{
GdkAtom *tmp_targets;
gint tmp_n_targets;
result = gtk_selection_data_get_targets (data, &tmp_targets, &tmp_n_targets);
if (gdk_display_supports_selection_notification (gtk_clipboard_get_display (clipboard)))
{
clipboard->n_cached_targets = tmp_n_targets;
clipboard->cached_targets = g_memdup (tmp_targets,
tmp_n_targets * sizeof (GdkAtom));
}
if (n_targets)
*n_targets = tmp_n_targets;
if (targets)
*targets = tmp_targets;
else
g_free (tmp_targets);
gtk_selection_data_free (data);
}
return result;
}
static GtkClipboard *
clipboard_peek (GdkDisplay *display,
GdkAtom selection,
gboolean only_if_exists)
{
GtkClipboard *clipboard = NULL;
GSList *clipboards;
GSList *tmp_list;
if (selection == GDK_NONE)
selection = GDK_SELECTION_CLIPBOARD;
clipboards = g_object_get_data (G_OBJECT (display), "gtk-clipboard-list");
tmp_list = clipboards;
while (tmp_list)
{
clipboard = tmp_list->data;
if (clipboard->selection == selection)
break;
tmp_list = tmp_list->next;
}
if (!tmp_list && !only_if_exists)
{
clipboard = g_object_new (GTK_TYPE_CLIPBOARD, NULL);
clipboard->selection = selection;
clipboard->display = display;
clipboard->n_cached_targets = -1;
clipboard->n_storable_targets = -1;
clipboards = g_slist_prepend (clipboards, clipboard);
g_object_set_data (G_OBJECT (display), I_("gtk-clipboard-list"), clipboards);
g_signal_connect (display, "closed",
G_CALLBACK (clipboard_display_closed), clipboard);
gdk_display_request_selection_notification (display, selection);
}
return clipboard;
}
static void
gtk_clipboard_owner_change (GtkClipboard *clipboard,
GdkEventOwnerChange *event)
{
if (clipboard->n_cached_targets != -1)
{
g_free (clipboard->cached_targets);
clipboard->cached_targets = NULL;
clipboard->n_cached_targets = -1;
}
}
/**
* gtk_clipboard_wait_is_target_available:
* @clipboard: a #GtkClipboard
* @target: A #GdkAtom indicating which target to look for.
*
* Checks if a clipboard supports pasting data of a given type. This
* function can be used to determine if a “Paste” menu item should be
* insensitive or not.
*
* If you want to see if there’s text available on the clipboard, use
* gtk_clipboard_wait_is_text_available () instead.
*
* Returns: %TRUE if the target is available, %FALSE otherwise.
*
* Since: 2.6
*/
gboolean
gtk_clipboard_wait_is_target_available (GtkClipboard *clipboard,
GdkAtom target)
{
GdkAtom *targets;
gint i, n_targets;
gboolean retval = FALSE;
if (!gtk_clipboard_wait_for_targets (clipboard, &targets, &n_targets))
return FALSE;
for (i = 0; i < n_targets; i++)
{
if (targets[i] == target)
{
retval = TRUE;
break;
}
}
g_free (targets);
return retval;
}
/**
* _gtk_clipboard_handle_event:
* @event: a owner change event
*
* Emits the #GtkClipboard::owner-change signal on the appropriate @clipboard.
*
* Since: 2.6
**/
void
_gtk_clipboard_handle_event (GdkEventOwnerChange *event)
{
GdkDisplay *display;
GtkClipboard *clipboard;
display = gdk_window_get_display (event->window);
clipboard = clipboard_peek (display, event->selection, TRUE);
if (clipboard)
g_signal_emit (clipboard,
clipboard_signals[OWNER_CHANGE], 0, event, NULL);
}
static gboolean
gtk_clipboard_store_timeout (GtkClipboard *clipboard)
{
g_main_loop_quit (clipboard->store_loop);
return G_SOURCE_REMOVE;
}
/**
* gtk_clipboard_set_can_store:
* @clipboard: a #GtkClipboard
* @targets: (allow-none) (array length=n_targets): array containing
* information about which forms should be stored or %NULL
* to indicate that all forms should be stored.
* @n_targets: number of elements in @targets
*
* Hints that the clipboard data should be stored somewhere when the
* application exits or when gtk_clipboard_store () is called.
*
* This value is reset when the clipboard owner changes.
* Where the clipboard data is stored is platform dependent,
* see gdk_display_store_clipboard () for more information.
*
* Since: 2.6
*/
void
gtk_clipboard_set_can_store (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
gint n_targets)
{
g_return_if_fail (GTK_IS_CLIPBOARD (clipboard));
g_return_if_fail (n_targets >= 0);
GTK_CLIPBOARD_GET_CLASS (clipboard)->set_can_store (clipboard,
targets,
n_targets);
}
static void
gtk_clipboard_real_set_can_store (GtkClipboard *clipboard,
const GtkTargetEntry *targets,
gint n_targets)
{
GtkWidget *clipboard_widget;
int i;
static const GtkTargetEntry save_targets[] = {
{ (char *) "SAVE_TARGETS", 0, TARGET_SAVE_TARGETS }
};
if (clipboard->selection != GDK_SELECTION_CLIPBOARD)
return;
g_free (clipboard->storable_targets);
clipboard_widget = get_clipboard_widget (clipboard->display);
/* n_storable_targets being -1 means that
* gtk_clipboard_set_can_store hasn't been called since the
* clipboard owner changed. We only want to add SAVE_TARGETS and
* ref the owner once , so we do that here
*/
if (clipboard->n_storable_targets == -1)
{
gtk_selection_add_targets (clipboard_widget, clipboard->selection,
save_targets, 1);
/* Ref the owner so it won't go away */
if (clipboard->have_owner)
g_object_ref (clipboard->user_data);
}
clipboard->n_storable_targets = n_targets;
clipboard->storable_targets = g_new (GdkAtom, n_targets);
for (i = 0; i < n_targets; i++)
clipboard->storable_targets[i] = gdk_atom_intern (targets[i].target, FALSE);
}
static gboolean
gtk_clipboard_selection_notify (GtkWidget *widget,
GdkEventSelection *event,
GtkClipboard *clipboard)
{
if (event->selection == gdk_atom_intern_static_string ("CLIPBOARD_MANAGER") &&
clipboard->storing_selection)
g_main_loop_quit (clipboard->store_loop);
return FALSE;
}
/**
* gtk_clipboard_store:
* @clipboard: a #GtkClipboard
*
* Stores the current clipboard data somewhere so that it will stay
* around after the application has quit.
*
* Since: 2.6
*/
void
gtk_clipboard_store (GtkClipboard *clipboard)
{
g_return_if_fail (GTK_IS_CLIPBOARD (clipboard));
GTK_CLIPBOARD_GET_CLASS (clipboard)->store (clipboard);
}
static void
gtk_clipboard_real_store (GtkClipboard *clipboard)
{
GtkWidget *clipboard_widget;
if (clipboard->n_storable_targets < 0)
return;
if (!gdk_display_supports_clipboard_persistence (clipboard->display))
return;
g_object_ref (clipboard);
clipboard_widget = get_clipboard_widget (clipboard->display);
clipboard->notify_signal_id = g_signal_connect (clipboard_widget,
"selection-notify-event",
G_CALLBACK (gtk_clipboard_selection_notify),
clipboard);
gdk_display_store_clipboard (clipboard->display,
gtk_widget_get_window (clipboard_widget),
clipboard_get_timestamp (clipboard),
clipboard->storable_targets,
clipboard->n_storable_targets);
clipboard->storing_selection = TRUE;
clipboard->store_loop = g_main_loop_new (NULL, TRUE);
clipboard->store_timeout = g_timeout_add_seconds (10, (GSourceFunc) gtk_clipboard_store_timeout, clipboard);
g_source_set_name_by_id (clipboard->store_timeout, "[gtk+] gtk_clipboard_store_timeout");
if (g_main_loop_is_running (clipboard->store_loop))
{
gdk_threads_leave ();
g_main_loop_run (clipboard->store_loop);
gdk_threads_enter ();
}
g_main_loop_unref (clipboard->store_loop);
clipboard->store_loop = NULL;
g_source_remove (clipboard->store_timeout);
clipboard->store_timeout = 0;
g_signal_handler_disconnect (clipboard_widget, clipboard->notify_signal_id);
clipboard->notify_signal_id = 0;
clipboard->storing_selection = FALSE;
g_object_unref (clipboard);
}
/* Stores all clipboard selections on all displays, called from
* gtk_main_quit ().
*/
void
_gtk_clipboard_store_all (void)
{
GtkClipboard *clipboard;
GSList *displays, *list;
displays = gdk_display_manager_list_displays (gdk_display_manager_get ());
list = displays;
while (list)
{
GdkDisplay *display = list->data;
clipboard = clipboard_peek (display, GDK_SELECTION_CLIPBOARD, TRUE);
if (clipboard)
gtk_clipboard_store (clipboard);
list = list->next;
}
g_slist_free (displays);
}
/**
* gtk_clipboard_get_selection:
* @clipboard: a #GtkClipboard
*
* Gets the selection that this clipboard is for.
*
* Returns: the selection
*
* Since: 3.22
*/
GdkAtom
gtk_clipboard_get_selection (GtkClipboard *clipboard)
{
g_return_val_if_fail (GTK_IS_CLIPBOARD (clipboard), GDK_NONE);
return clipboard->selection;
}
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