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gtk2/gdk/x11/gdkselection-x11.c
Owen Taylor c117408d9e Update for multihead. 
Tue Apr 30 12:26:31 2002  Owen Taylor  <otaylor@redhat.com>

        * gdk-sections.txt: Update for multihead.

        * multihead.sgml gtk-docs.sgml:	Add overview of
	multihead from	multihead branch.

	* tmpl/gdkdisplay.sgml	tmpl/gdkscreen.sgml: New
        sections from multihead	branch.
2002-04-30 18:07:51 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU 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.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <string.h>
#include "gdkx.h"
#include "gdkproperty.h"
#include "gdkselection.h"
#include "gdkprivate.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
typedef struct _OwnerInfo OwnerInfo;
struct _OwnerInfo
{
GdkAtom selection;
GdkWindow *owner;
gulong serial;
};
static GSList *owner_list;
/* When a window is destroyed we check if it is the owner
* of any selections. This is somewhat inefficient, but
* owner_list is typically short, and it is a low memory,
* low code solution
*/
void
_gdk_selection_window_destroyed (GdkWindow *window)
{
GSList *tmp_list = owner_list;
while (tmp_list)
{
OwnerInfo *info = tmp_list->data;
tmp_list = tmp_list->next;
if (info->owner == window)
{
owner_list = g_slist_remove (owner_list, info);
g_free (info);
}
}
}
/* We only pass through those SelectionClear events that actually
* reflect changes to the selection owner that we didn't make ourself.
*/
gboolean
_gdk_selection_filter_clear_event (XSelectionClearEvent *event)
{
GSList *tmp_list = owner_list;
GdkDisplay *display = gdk_x11_lookup_xdisplay (event->display);
while (tmp_list)
{
OwnerInfo *info = tmp_list->data;
if (gdk_drawable_get_display (info->owner) == display &&
info->selection == gdk_x11_xatom_to_atom_for_display (display, event->selection))
{
if ((GDK_DRAWABLE_XID (info->owner) == event->window &&
event->serial >= info->serial))
{
owner_list = g_slist_remove (owner_list, info);
g_free (info);
return TRUE;
}
else
return FALSE;
}
tmp_list = tmp_list->next;
}
return FALSE;
}
/**
* gdk_selection_owner_set_for_display:
* @display : the #GdkDisplay.
* @owner : a GdkWindow or NULL to indicate that the the owner for
* the given should be unset.
* @selection : an atom identifying a selection.
* @time : timestamp to use when setting the selection.
* If this is older than the timestamp given last time the owner was
* set for the given selection, the request will be ignored.
* @send_event : if TRUE, and the new owner is different from the current
* owner, the current owner will be sent a SelectionClear event.
*
* Sets the #GdkWindow @owner as the current owner of the selection @selection.
*
* Returns : TRUE if the selection owner was succesfully changed to owner,
* otherwise FALSE.
*/
gboolean
gdk_selection_owner_set_for_display (GdkDisplay *display,
GdkWindow *owner,
GdkAtom selection,
guint32 time,
gboolean send_event)
{
Display *xdisplay;
Window xwindow;
Atom xselection;
GSList *tmp_list;
OwnerInfo *info;
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
if (owner)
{
if (GDK_WINDOW_DESTROYED (owner))
return FALSE;
xdisplay = GDK_WINDOW_XDISPLAY (owner);
xwindow = GDK_WINDOW_XID (owner);
}
else
{
xdisplay = GDK_DISPLAY_XDISPLAY (display);
xwindow = None;
}
xselection = gdk_x11_atom_to_xatom_for_display (display, selection);
tmp_list = owner_list;
while (tmp_list)
{
info = tmp_list->data;
if (info->selection == selection)
{
owner_list = g_slist_remove (owner_list, info);
g_free (info);
break;
}
tmp_list = tmp_list->next;
}
if (owner)
{
info = g_new (OwnerInfo, 1);
info->owner = owner;
info->serial = NextRequest (GDK_WINDOW_XDISPLAY (owner));
info->selection = selection;
owner_list = g_slist_prepend (owner_list, info);
}
XSetSelectionOwner (xdisplay, xselection, xwindow, time);
return (XGetSelectionOwner (xdisplay, xselection) == xwindow);
}
gboolean
gdk_selection_owner_set (GdkWindow *owner,
GdkAtom selection,
guint32 time,
gboolean send_event)
{
return gdk_selection_owner_set_for_display (gdk_get_default_display (),
owner, selection,
time, send_event);
}
/**
* gdk_selection_owner_get_for_display :
* @display : a #GdkDisplay.
* @selection : an atom indentifying a selection.
*
* Determine the owner of the given selection.
*
* Note that the return value may be owned by a different
* process if a foreign window was previously created for that
* window, but a new foreign window will never be created by this call.
*
* Returns :if there is a selection owner for this window,
* and it is a window known to the current process, the GdkWindow that owns
* the selection, otherwise NULL.
*/
GdkWindow *
gdk_selection_owner_get_for_display (GdkDisplay *display,
GdkAtom selection)
{
Window xwindow;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
xwindow = XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display),
gdk_x11_atom_to_xatom_for_display (display,
selection));
if (xwindow == None)
return NULL;
return gdk_window_lookup_for_display (display, xwindow);
}
GdkWindow*
gdk_selection_owner_get (GdkAtom selection)
{
return gdk_selection_owner_get_for_display (gdk_get_default_display (),
selection);
}
void
gdk_selection_convert (GdkWindow *requestor,
GdkAtom selection,
GdkAtom target,
guint32 time)
{
GdkDisplay *display;
if (GDK_WINDOW_DESTROYED (requestor))
return;
display = GDK_WINDOW_DISPLAY (requestor);
XConvertSelection (GDK_WINDOW_XDISPLAY (requestor),
gdk_x11_atom_to_xatom_for_display (display, selection),
gdk_x11_atom_to_xatom_for_display (display, target),
gdk_x11_atom_to_xatom_for_display (display, _gdk_selection_property),
GDK_WINDOW_XID (requestor), time);
}
gint
gdk_selection_property_get (GdkWindow *requestor,
guchar **data,
GdkAtom *ret_type,
gint *ret_format)
{
gulong nitems;
gulong nbytes;
gulong length;
Atom prop_type;
gint prop_format;
guchar *t = NULL;
GdkDisplay *display;
g_return_val_if_fail (requestor != NULL, 0);
g_return_val_if_fail (GDK_IS_WINDOW (requestor), 0);
display = GDK_WINDOW_DISPLAY (requestor);
/* If retrieved chunks are typically small, (and the ICCCM says the
should be) it would be a win to try first with a buffer of
moderate length, to avoid two round trips to the server */
if (GDK_WINDOW_DESTROYED (requestor))
return 0;
t = NULL;
XGetWindowProperty (GDK_WINDOW_XDISPLAY (requestor),
GDK_WINDOW_XID (requestor),
gdk_x11_atom_to_xatom_for_display (display, _gdk_selection_property),
0, 0, False,
AnyPropertyType, &prop_type,
&prop_format, &nitems, &nbytes, &t);
if (ret_type)
*ret_type = gdk_x11_xatom_to_atom_for_display (display, prop_type);
if (ret_format)
*ret_format = prop_format;
if (prop_type == None)
{
*data = NULL;
return 0;
}
if (t)
{
XFree (t);
t = NULL;
}
/* Add on an extra byte to handle null termination. X guarantees
that t will be 1 longer than nbytes and null terminated */
length = nbytes + 1;
/* We can't delete the selection here, because it might be the INCR
protocol, in which case the client has to make sure they'll be
notified of PropertyChange events _before_ the property is deleted.
Otherwise there's no guarantee we'll win the race ... */
XGetWindowProperty (GDK_DRAWABLE_XDISPLAY (requestor),
GDK_DRAWABLE_XID (requestor),
gdk_x11_atom_to_xatom_for_display (display, _gdk_selection_property),
0, (nbytes + 3) / 4, False,
AnyPropertyType, &prop_type, &prop_format,
&nitems, &nbytes, &t);
if (prop_type != None)
{
*data = g_new (guchar, length);
if (prop_type == XA_ATOM ||
prop_type == gdk_x11_get_xatom_by_name_for_display (display, "ATOM_PAIR"))
{
Atom* atoms = (Atom*) t;
GdkAtom* atoms_dest;
gint num_atom, i;
num_atom = (length - 1) / sizeof (Atom);
length = sizeof (GdkAtom) * num_atom + 1;
*data = g_malloc (length);
(*data)[length - 1] = '\0';
atoms_dest = (GdkAtom *)(*data);
for (i=0; i < num_atom; i++)
atoms_dest[i] = gdk_x11_xatom_to_atom_for_display (display, atoms[i]);
}
else
{
*data = g_memdup (t, length);
}
if (t)
XFree (t);
return length-1;
}
else
{
*data = NULL;
return 0;
}
}
/**
* gdk_selection_send_notify_for_display :
* @display : the #GdkDisplay where @requestor is realized
* @requestor : window to which to deliver response.
* @selection : selection that was requested.
* @target : target that was selected.
* @property : property in which the selection owner stored the data,
* or GDK_NONE to indicate that the request was rejected.
* @time : timestamp.
*
* Send a response to SelectionRequest event.
**/
void
gdk_selection_send_notify_for_display (GdkDisplay *display,
guint32 requestor,
GdkAtom selection,
GdkAtom target,
GdkAtom property,
guint32 time)
{
XSelectionEvent xevent;
g_return_if_fail (GDK_IS_DISPLAY (display));
xevent.type = SelectionNotify;
xevent.serial = 0;
xevent.send_event = True;
xevent.requestor = requestor;
xevent.selection = gdk_x11_atom_to_xatom_for_display (display, selection);
xevent.target = gdk_x11_atom_to_xatom_for_display (display, target);
xevent.property = gdk_x11_atom_to_xatom_for_display (display, property);
xevent.time = time;
_gdk_send_xevent (display, requestor, False, NoEventMask, (XEvent*) & xevent);
}
void
gdk_selection_send_notify (guint32 requestor,
GdkAtom selection,
GdkAtom target,
GdkAtom property,
guint32 time)
{
gdk_selection_send_notify_for_display (gdk_get_default_display (),
requestor, selection,
target, property, time);
}
/**
* gdk_text_property_to_text_list_for_display:
* @display: The #GdkDisplay where the encoding is defined.
* @encoding: an atom representing the encoding. The most
* common values for this are STRING, or COMPOUND_TEXT.
* This is value used as the type for the property.
* @format: the format of the property.
* @text: The text data.
* @length: The number of items to transform.
* @list: location to store a terminated array of strings in
* the encoding of the current locale. This array should be
* freed using gdk_free_text_list().
*
* Convert a text string from the encoding as it is stored
* in a property into an array of strings in the encoding of
* the current local. (The elements of the array represent the
* null-separated elements of the original text string.)
*
* Returns : he number of strings stored in list, or 0,
* if the conversion failed.
*/
gint
gdk_text_property_to_text_list_for_display (GdkDisplay *display,
GdkAtom encoding,
gint format,
const guchar *text,
gint length,
gchar ***list)
{
XTextProperty property;
gint count = 0;
gint res;
gchar **local_list;
g_return_val_if_fail (GDK_IS_DISPLAY (display), 0);
property.value = (guchar *)text;
property.encoding = gdk_x11_atom_to_xatom_for_display (display, encoding);
property.format = format;
property.nitems = length;
res = XmbTextPropertyToTextList (GDK_DISPLAY_XDISPLAY (display), &property,
&local_list, &count);
if (res == XNoMemory || res == XLocaleNotSupported ||
res == XConverterNotFound)
{
if (list)
*list = NULL;
return 0;
}
else
{
if (list)
*list = local_list;
else
XFreeStringList (local_list);
return count;
}
}
gint
gdk_text_property_to_text_list (GdkAtom encoding,
gint format,
const guchar *text,
gint length,
gchar ***list)
{
return gdk_text_property_to_text_list_for_display (gdk_get_default_display (),
encoding, format, text, length, list);
}
void
gdk_free_text_list (gchar **list)
{
g_return_if_fail (list != NULL);
XFreeStringList (list);
}
static gint
make_list (const gchar *text,
gint length,
gboolean latin1,
gchar ***list)
{
GSList *strings = NULL;
gint n_strings = 0;
gint i;
const gchar *p = text;
const gchar *q;
GSList *tmp_list;
GError *error = NULL;
while (p < text + length)
{
gchar *str;
q = p;
while (*q && q < text + length)
q++;
if (latin1)
{
str = g_convert (p, q - p,
"UTF-8", "ISO-8859-1",
NULL, NULL, &error);
if (!str)
{
g_warning ("Error converting selection from STRING: %s",
error->message);
g_error_free (error);
}
}
else
str = g_strndup (p, q - p);
if (str)
{
strings = g_slist_prepend (strings, str);
n_strings++;
}
p = q + 1;
}
if (list)
*list = g_new (gchar *, n_strings + 1);
(*list)[n_strings] = NULL;
i = n_strings;
tmp_list = strings;
while (tmp_list)
{
if (list)
(*list)[--i] = tmp_list->data;
else
g_free (tmp_list->data);
tmp_list = tmp_list->next;
}
g_slist_free (strings);
return n_strings;
}
/**
* gdk_text_property_to_utf8_list_for_display:
* @display: a #GdkDisplay
* @encoding: an atom representing the encoding of the text
* @format: the format of the property
* @text: the text to convert
* @length: the length of @text, in bytes
* @list: location to store the list of strings or %NULL. The
* list should be freed with g_strfreev().
*
* Converts a text property in the giving encoding to
* a list of UTF-8 strings.
*
* Return value: the number of strings in the resulting
* list.
**/
gint
gdk_text_property_to_utf8_list_for_display (GdkDisplay *display,
GdkAtom encoding,
gint format,
const guchar *text,
gint length,
gchar ***list)
{
g_return_val_if_fail (text != NULL, 0);
g_return_val_if_fail (length >= 0, 0);
g_return_val_if_fail (GDK_IS_DISPLAY (display), 0);
if (encoding == GDK_TARGET_STRING)
{
return make_list ((gchar *)text, length, TRUE, list);
}
else if (encoding == gdk_atom_intern ("UTF8_STRING", FALSE))
{
return make_list ((gchar *)text, length, FALSE, list);
}
else
{
gchar **local_list;
gint local_count;
gint i;
const gchar *charset = NULL;
gboolean need_conversion = !g_get_charset (&charset);
gint count = 0;
GError *error = NULL;
/* Probably COMPOUND text, we fall back to Xlib routines
*/
local_count = gdk_text_property_to_text_list_for_display (display,
encoding,
format,
text,
length,
&local_list);
if (list)
*list = g_new (gchar *, local_count + 1);
for (i=0; i<local_count; i++)
{
/* list contains stuff in our default encoding
*/
if (need_conversion)
{
gchar *utf = g_convert (local_list[i], -1,
"UTF-8", charset,
NULL, NULL, &error);
if (utf)
{
if (list)
(*list)[count++] = utf;
else
g_free (utf);
}
else
{
g_warning ("Error converting to UTF-8 from '%s': %s",
charset, error->message);
g_error_free (error);
error = NULL;
}
}
else
{
if (list)
(*list)[count++] = g_strdup (local_list[i]);
}
}
if (local_count)
gdk_free_text_list (local_list);
(*list)[count] = NULL;
return count;
}
}
/**
* gdk_text_property_to_utf8_list:
* @encoding: an atom representing the encoding of the text
* @format: the format of the property
* @text: the text to convert
* @length: the length of @text, in bytes
* @list: location to store the list of strings or %NULL. The
* list should be freed with g_strfreev().
*
* Convert a text property in the giving encoding to
* a list of UTF-8 strings.
*
* Return value: the number of strings in the resulting
* list.
**/
gint
gdk_text_property_to_utf8_list (GdkAtom encoding,
gint format,
const guchar *text,
gint length,
gchar ***list)
{
return gdk_text_property_to_utf8_list_for_display (gdk_get_default_display (),
encoding, format, text, length, list);
}
/**
* gdk_string_to_compound_text_for_display:
* @display : the #GdkDisplay where the encoding is defined.
* @str : a null-terminated string.
* @encoding: location to store the encoding atom
* (to be used as the type for the property).
* @format: location to store the format of the property
* @ctext: location to store newly allocated data for the property.
* @length: the length of @text, in bytes
*
* Convert a string from the encoding of the current
* locale into a form suitable for storing in a window property.
*
* Returns : 0 upon sucess, non-zero upon failure.
**/
gint
gdk_string_to_compound_text_for_display (GdkDisplay *display,
const gchar *str,
GdkAtom *encoding,
gint *format,
guchar **ctext,
gint *length)
{
gint res;
XTextProperty property;
g_return_val_if_fail (GDK_IS_DISPLAY (display), 0);
res = XmbTextListToTextProperty (GDK_DISPLAY_XDISPLAY (display),
(char **)&str, 1, XCompoundTextStyle,
&property);
if (res != Success)
{
property.encoding = None;
property.format = None;
property.value = NULL;
property.nitems = 0;
}
if (encoding)
*encoding = gdk_x11_xatom_to_atom_for_display (display, property.encoding);
if (format)
*format = property.format;
if (ctext)
*ctext = property.value;
if (length)
*length = property.nitems;
return res;
}
gint
gdk_string_to_compound_text (const gchar *str,
GdkAtom *encoding,
gint *format,
guchar **ctext,
gint *length)
{
return gdk_string_to_compound_text_for_display (gdk_get_default_display (),
str, encoding, format,
ctext, length);
}
/* The specifications for COMPOUND_TEXT and STRING specify that C0 and
* C1 are not allowed except for \n and \t, however the X conversions
* routines for COMPOUND_TEXT only enforce this in one direction,
* causing cut-and-paste of \r and \r\n separated text to fail.
* This routine strips out all non-allowed C0 and C1 characters
* from the input string and also canonicalizes \r, and \r\n to \n
*/
static gchar *
sanitize_utf8 (const gchar *src)
{
gint len = strlen (src);
GString *result = g_string_sized_new (len);
const gchar *p = src;
while (*p)
{
if (*p == '\r')
{
p++;
if (*p == '\n')
p++;
g_string_append_c (result, '\n');
}
else
{
gunichar ch = g_utf8_get_char (p);
char buf[7];
gint buflen;
if (!((ch < 0x20 && ch != '\t' && ch != '\n') || (ch >= 0x7f && ch < 0xa0)))
{
buflen = g_unichar_to_utf8 (ch, buf);
g_string_append_len (result, buf, buflen);
}
p = g_utf8_next_char (p);
}
}
return g_string_free (result, FALSE);
}
/**
* gdk_utf8_to_string_target:
* @str: a UTF-8 string
*
* Converts an UTF-8 string into the best possible representation
* as a STRING. The representation of characters not in STRING
* is not specified; it may be as pseudo-escape sequences
* \x{ABCD}, or it may be in some other form of approximation.
*
* Return value: the newly-allocated string, or %NULL if the
* conversion failed. (It should not fail for
* any properly formed UTF-8 string unless system
* limits like memory or file descriptors are exceeded.)
**/
gchar *
gdk_utf8_to_string_target (const gchar *str)
{
GError *error = NULL;
gchar *tmp_str = sanitize_utf8 (str);
gchar *result = g_convert_with_fallback (tmp_str, -1,
"ISO-8859-1", "UTF-8",
NULL, NULL, NULL, &error);
if (!result)
{
g_warning ("Error converting from UTF-8 to STRING: %s",
error->message);
g_error_free (error);
}
g_free (tmp_str);
return result;
}
/**
* gdk_utf8_to_compound_text_for_display:
* @display: a #GdkDisplay
* @str: a UTF-8 string
* @encoding: location to store resulting encoding
* @format: location to store format of the result
* @ctext: location to store the data of the result
* @length: location to store the length of the data
* stored in @ctext
*
* Converts from UTF-8 to compound text.
*
* Return value: %TRUE if the conversion succeeded, otherwise
* %FALSE.
**/
gboolean
gdk_utf8_to_compound_text_for_display (GdkDisplay *display,
const gchar *str,
GdkAtom *encoding,
gint *format,
guchar **ctext,
gint *length)
{
gboolean need_conversion;
const gchar *charset;
gchar *locale_str, *tmp_str;
GError *error = NULL;
gboolean result;
g_return_val_if_fail (str != NULL, FALSE);
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
need_conversion = !g_get_charset (&charset);
tmp_str = sanitize_utf8 (str);
if (need_conversion)
{
locale_str = g_convert_with_fallback (tmp_str, -1,
charset, "UTF-8",
NULL, NULL, NULL, &error);
g_free (tmp_str);
if (!locale_str)
{
g_warning ("Error converting from UTF-8 to '%s': %s",
charset, error->message);
g_error_free (error);
if (encoding)
*encoding = None;
if (format)
*format = None;
if (ctext)
*ctext = NULL;
if (length)
*length = 0;
return FALSE;
}
}
else
locale_str = tmp_str;
result = gdk_string_to_compound_text_for_display (display, locale_str,
encoding, format,
ctext, length);
result = (result == Success? TRUE : FALSE);
g_free (locale_str);
return result;
}
/**
* gdk_utf8_to_compound_text:
* @str: a UTF-8 string
* @encoding: location to store resulting encoding
* @format: location to store format of the result
* @ctext: location to store the data of the result
* @length: location to store the length of the data
* stored in @ctext
*
* Convert from UTF-8 to compound text.
*
* Return value: %TRUE if the conversion succeeded, otherwise
* false.
**/
gboolean
gdk_utf8_to_compound_text (const gchar *str,
GdkAtom *encoding,
gint *format,
guchar **ctext,
gint *length)
{
return gdk_utf8_to_compound_text_for_display (gdk_get_default_display (),
str, encoding, format,
ctext, length);
}
void gdk_free_compound_text (guchar *ctext)
{
if (ctext)
XFree (ctext);
}
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