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gtk2/gtk/gtkclipboard.c
Matthias Clasen 14ee65b66a Data constness fixes. (#75754)
2002-12-10 21:39:53 +00:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2000 Red Hat, Inc.
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Global clipboard abstraction.
*/
#include <string.h>
#include "gtkclipboard.h"
#include "gtkinvisible.h"
#include "gtkmain.h"
#ifdef GDK_WINDOWING_X11
#include "x11/gdkx.h"
#endif
#ifdef GDK_WINDOWING_WIN32
#include "win32/gdkwin32.h"
#endif
typedef struct _GtkClipboardClass GtkClipboardClass;
typedef struct _RequestContentsInfo RequestContentsInfo;
typedef struct _RequestTextInfo RequestTextInfo;
struct _GtkClipboard
{
GObject parent_instance;
GdkAtom selection;
GtkClipboardGetFunc get_func;
GtkClipboardClearFunc clear_func;
gpointer user_data;
gboolean have_owner;
guint32 timestamp;
gboolean have_selection;
GdkDisplay *display;
};
struct _GtkClipboardClass
{
GObjectClass parent_class;
};
struct _RequestContentsInfo
{
GtkClipboardReceivedFunc callback;
gpointer user_data;
};
struct _RequestTextInfo
{
GtkClipboardTextReceivedFunc callback;
gpointer user_data;
};
static void gtk_clipboard_class_init (GtkClipboardClass *class);
static void gtk_clipboard_finalize (GObject *object);
static void clipboard_unset (GtkClipboard *clipboard);
static void selection_received (GtkWidget *widget,
GtkSelectionData *selection_data,
guint time);
enum {
TARGET_STRING,
TARGET_TEXT,
TARGET_COMPOUND_TEXT,
TARGET_UTF8_STRING
};
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 GObjectClass *parent_class;
GType
gtk_clipboard_get_type (void)
{
static GType clipboard_type = 0;
if (!clipboard_type)
{
static const GTypeInfo clipboard_info =
{
sizeof (GtkClipboardClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gtk_clipboard_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkClipboard),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
};
clipboard_type = g_type_register_static (G_TYPE_OBJECT, "GtkClipboard",
&clipboard_info, 0);
}
return clipboard_type;
}
static void
gtk_clipboard_class_init (GtkClipboardClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
parent_class = g_type_class_peek_parent (class);
gobject_class->finalize = gtk_clipboard_finalize;
}
static void
gtk_clipboard_finalize (GObject *object)
{
clipboard_unset (GTK_CLIPBOARD (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));
g_object_unref (clipboard);
clipboards = g_slist_remove (clipboards, clipboard);
g_object_set_data (G_OBJECT (display), "gtk-clipboard-list", clipboards);
}
/**
* gtk_clipboard_get_for_display:
* @display: the display 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 <literal>gdk_atom_intern
* ("CLIPBOARD", FALSE)</literal>. See
* <ulink url="http://www.freedesktop.org/standards/clipboards.txt">
* http://www.freedesktop.org/standards/clipboards.txt</ulink>
* 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".
*
* Return value: 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 for all time and
* cannot be freed.
*
* Since: 2.2
**/
GtkClipboard *
gtk_clipboard_get_for_display (GdkDisplay *display, GdkAtom selection)
{
GtkClipboard *clipboard = NULL;
GSList *clipboards;
GSList *tmp_list;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
g_return_val_if_fail (!display->closed, NULL);
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)
{
clipboard = g_object_new (GTK_TYPE_CLIPBOARD, NULL);
clipboard->selection = selection;
clipboard->display = display;
clipboards = g_slist_prepend (clipboards, clipboard);
g_object_set_data (G_OBJECT (display), "gtk-clipboard-list", clipboards);
g_signal_connect (display, "closed",
G_CALLBACK (clipboard_display_closed), clipboard);
}
return clipboard;
}
/**
* 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.
*
* Return value: 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 for all time and
* cannot be freed.
**/
GtkClipboard *
gtk_clipboard_get (GdkAtom selection)
{
return gtk_clipboard_get_for_display (gdk_display_get_default (), selection);
}
static void
selection_get_cb (GtkWidget *widget,
GtkSelectionData *selection_data,
guint info,
guint time)
{
GtkClipboard *clipboard = gtk_widget_get_clipboard (widget, selection_data->selection);
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), "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 ();
if (timestamp == GDK_CURRENT_TIME)
{
#ifdef GDK_WINDOWING_X11
timestamp = gdk_x11_get_server_time (clipboard_widget->window);
#elif defined GDK_WINDOWING_WIN32
timestamp = GetMessageTime ();
#endif
}
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->have_owner && have_owner) ||
clipboard->user_data != user_data)
{
clipboard_unset (clipboard);
if (clipboard->get_func)
{
/* Calling unset() caused the clipboard contents to be reset!
* Avoid leaking and return
*/
if (!(clipboard->have_owner && have_owner) ||
clipboard->user_data != user_data)
{
(*clear_func) (clipboard, user_data);
return FALSE;
}
else
return TRUE;
}
else
{
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:
* @clipboard: a #GtkClipboard
* @targets: array containing information about the available forms for the
* clipboard data
* @n_targets: number of elements in @targets
* @get_func: function to call to get the actual clipboard data
* @clear_func: 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.
*
* Return value: %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_set_contents (clipboard, targets, n_targets,
get_func, clear_func, user_data,
FALSE);
}
/**
* gtk_clipboard_set_with_owner:
* @clipboard: a #GtkClipboard
* @targets: array containing information about the available forms for the
* clipboard data
* @n_targets: number of elements in @targets
* @get_func: function to call to get the actual clipboard data
* @clear_func: 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.
*
* Return value: %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_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().
*
* Return value: 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;
old_clear_func = clipboard->clear_func;
old_data = clipboard->user_data;
if (clipboard->have_owner)
{
clipboard_remove_owner_notify (clipboard);
clipboard->have_owner = FALSE;
}
clipboard->get_func = NULL;
clipboard->clear_func = NULL;
clipboard->user_data = NULL;
if (old_clear_func)
old_clear_func (clipboard, 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);
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 <function>strlen()</function>.
*
* 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)
{
static const GtkTargetEntry targets[] = {
{ "STRING", 0, TARGET_STRING },
{ "TEXT", 0, TARGET_TEXT },
{ "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
{ "UTF8_STRING", 0, TARGET_UTF8_STRING }
};
g_return_if_fail (clipboard != NULL);
g_return_if_fail (text != NULL);
if (len < 0)
len = strlen (text);
gtk_clipboard_set_with_data (clipboard,
targets, G_N_ELEMENTS (targets),
text_get_func, text_clear_func,
g_strndup (text, len));
}
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, selection_data->selection),
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: 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)
{
RequestContentsInfo *info;
GtkWidget *widget;
GtkWidget *clipboard_widget;
g_return_if_fail (clipboard != NULL);
g_return_if_fail (target != GDK_NONE);
g_return_if_fail (callback != NULL);
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 = 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.
*/
if (selection_data->target == gdk_atom_intern ("UTF8_STRING", FALSE))
{
gtk_clipboard_request_contents (clipboard,
gdk_atom_intern ("COMPOUND_TEXT", FALSE),
request_text_received_func, info);
return;
}
else if (selection_data->target == gdk_atom_intern ("COMPOUND_TEXT", FALSE))
{
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: 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 ("UTF8_STRING", FALSE),
request_text_received_func,
info);
}
typedef struct
{
GMainLoop *loop;
gpointer data;
} WaitResults;
static void
clipboard_received_func (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data)
{
WaitResults *results = data;
if (selection_data->length >= 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.
*
* Return value: 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.
*
* Return value: 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);
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;
}
/**
* gtk_clipboard_get_display:
* @clipboard: a #GtkClipboard
*
* Gets the #GdkDisplay associated with @clipboard
*
* Return value: 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 names: STRING, TEXT, COMPOUND_TEXT,
* UTF8_STRING. 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.
*
* Return value: %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 ("TARGETS", FALSE));
if (data)
{
result = gtk_selection_data_targets_include_text (data);
gtk_selection_data_free (data);
}
return result;
}
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