Commit 85b356da authored by Javier Jardón's avatar Javier Jardón

Move documentation to inline comments: GtkClipboard

parent bc647290
......@@ -21,6 +21,7 @@ gtkcellrenderertoggle.sgml
gtkcellview.sgml
gtkcheckbutton.sgml
gtkcheckmenuitem.sgml
gtkclipboard.sgml
gtkcolorbutton.sgml
gtkcolorsel.sgml
gtkcombobox.sgml
......
<!-- ##### SECTION Title ##### -->
Clipboards
<!-- ##### SECTION Short_Description ##### -->
Storing data on clipboards
<!-- ##### SECTION Long_Description ##### -->
<para>
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.
</para>
<para>
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.
</para>
<para>
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.
</para>
<para>
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.
</para>
<para>
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+.)
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
<variablelist>
<varlistentry>
<term>#GtkSelection</term>
<listitem><para>#GtkClipboard provides a high-level wrapper around the
lower level routines that deal with X selections. It is
also possibly to directly manipulate the X selections,
though it is seldom necessary to do so.</para></listitem>
</varlistentry>
</variablelist>
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### SECTION Image ##### -->
<!-- ##### STRUCT GtkClipboard ##### -->
<para>
</para>
<!-- ##### SIGNAL GtkClipboard::owner-change ##### -->
<para>
</para>
@clipboard: the object which received the signal.
@event:
<!-- ##### USER_FUNCTION GtkClipboardReceivedFunc ##### -->
<para>
A function to be called when the results of gtk_clipboard_request_contents()
are received, or when the request fails.
</para>
@clipboard: the #GtkClipboard
@selection_data: a #GtkSelectionData containing the data was received.
If retrieving the data failed, then then length field
of @selection_data will be negative.
@data: the @user_data supplied to gtk_clipboard_request_contents().
<!-- ##### USER_FUNCTION GtkClipboardTextReceivedFunc ##### -->
<para>
A function to be called when the results of gtk_clipboard_request_text()
are received, or when the request fails.
</para>
@clipboard: the #GtkClipboard
@text: the text received, as a UTF-8 encoded string, or %NULL
if retrieving the data failed.
@data: the @user_data supplied to gtk_clipboard_request_text().
<!-- ##### USER_FUNCTION GtkClipboardImageReceivedFunc ##### -->
<para>
A function to be called when the results of gtk_clipboard_request_image()
are received, or when the request fails.
</para>
@clipboard: the #GtkClipboard
@pixbuf: the received image
@data: the @user_data supplied to gtk_clipboard_request_image().
@Since: 2.6
<!-- ##### USER_FUNCTION GtkClipboardTargetsReceivedFunc ##### -->
<para>
A function to be called when the results of gtk_clipboard_request_targets()
are received, or when the request fails.
</para>
@clipboard: the #GtkClipboard
@atoms: the supported targets, as array of #GdkAtom, or %NULL
if retrieving the data failed.
@n_atoms: the length of the @atoms array.
@data: the @user_data supplied to gtk_clipboard_request_targets().
@Since: 2.4
<!-- ##### USER_FUNCTION GtkClipboardRichTextReceivedFunc ##### -->
<para>
</para>
@clipboard:
@format:
@text:
@length:
@data:
<!-- ##### USER_FUNCTION GtkClipboardURIReceivedFunc ##### -->
<para>
</para>
@clipboard:
@uris:
@data:
<!-- ##### USER_FUNCTION GtkClipboardGetFunc ##### -->
<para>
A function that will be called to provide the contents of the selection.
If multiple types of data were advertised, the requested type can
be determined from the @info parameter or by checking the target field
of @selection_data. If the data could successfully be converted into
then it should be stored into the @selection_data object by
calling gtk_selection_data_set() (or related functions such
as gtk_selection_data_set_text()). If no data is set, the requestor
will be informed that the attempt to get the data failed.
</para>
@clipboard: the #GtkClipboard
@selection_data: a #GtkSelectionData argument in which the requested
data should be stored.
@info: the info field corresponding to the requested
target from the #GtkTargetEntry array passed to
gtk_clipboard_set_with_data() or gtk_clipboard_set_with_owner().
@user_data_or_owner: the @user_data argument passed to gtk_clipboard_set_with_data(), or
the @owner argument passed to gtk_clipboard_set_with_owner()
<!-- ##### USER_FUNCTION GtkClipboardClearFunc ##### -->
<para>
A function that will be called when the contents of the clipboard are changed
or cleared. Once this has called, the @user_data_or_owner argument
will not be used again.
</para>
@clipboard: the #GtkClipboard
@user_data_or_owner: the @user_data argument passed to gtk_clipboard_set_with_data(), or
the @owner argument passed to gtk_clipboard_set_with_owner()
<!-- ##### FUNCTION gtk_clipboard_get ##### -->
<para>
</para>
@selection:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_get_for_display ##### -->
<para>
</para>
@display:
@selection:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_get_display ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_set_with_data ##### -->
<para>
</para>
@clipboard:
@targets:
@n_targets:
@get_func:
@clear_func:
@user_data:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_set_with_owner ##### -->
<para>
</para>
@clipboard:
@targets:
@n_targets:
@get_func:
@clear_func:
@owner:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_get_owner ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_clear ##### -->
<para>
</para>
@clipboard:
<!-- ##### FUNCTION gtk_clipboard_set_text ##### -->
<para>
</para>
@clipboard:
@text:
@len:
<!-- ##### FUNCTION gtk_clipboard_set_image ##### -->
<para>
</para>
@clipboard:
@pixbuf:
<!-- ##### FUNCTION gtk_clipboard_request_contents ##### -->
<para>
</para>
@clipboard:
@target:
@callback:
@user_data:
<!-- ##### FUNCTION gtk_clipboard_request_text ##### -->
<para>
</para>
@clipboard:
@callback:
@user_data:
<!-- ##### FUNCTION gtk_clipboard_request_image ##### -->
<para>
</para>
@clipboard:
@callback:
@user_data:
<!-- ##### FUNCTION gtk_clipboard_request_targets ##### -->
<para>
</para>
@clipboard:
@callback:
@user_data:
<!-- ##### FUNCTION gtk_clipboard_request_rich_text ##### -->
<para>
</para>
@clipboard:
@buffer:
@callback:
@user_data:
<!-- ##### FUNCTION gtk_clipboard_request_uris ##### -->
<para>
</para>
@clipboard:
@callback:
@user_data:
<!-- ##### FUNCTION gtk_clipboard_wait_for_contents ##### -->
<para>
</para>
@clipboard:
@target:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_for_text ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_for_image ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_for_rich_text ##### -->
<para>
</para>
@clipboard:
@buffer:
@format:
@length:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_for_uris ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_is_text_available ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_is_image_available ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_is_rich_text_available ##### -->
<para>
</para>
@clipboard:
@buffer:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_is_uris_available ##### -->
<para>
</para>
@clipboard:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_wait_for_targets ##### -->
<para>
</para>
@clipboard:
@targets:
@n_targets:
@Returns:
<!--
Local variables:
mode: sgml
sgml-parent-document: ("../gtk-docs.sgml" "book" "refsect2" "")
End:
-->
<!-- ##### FUNCTION gtk_clipboard_wait_is_target_available ##### -->
<para>
</para>
@clipboard:
@target:
@Returns:
<!-- ##### FUNCTION gtk_clipboard_set_can_store ##### -->
<para>
</para>
@clipboard:
@targets:
@n_targets:
<!-- ##### FUNCTION gtk_clipboard_store ##### -->
<para>
</para>
@clipboard:
......@@ -42,6 +42,73 @@
#include "win32/gdkwin32.h"
#endif
/**
* SECTION:gtkclipboard
* @Short_description: Storing data on clipboards
* @Title: Clipboards
* @See_also: #GtkSelection
*
* 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
......@@ -180,14 +247,14 @@ gtk_clipboard_class_init (GtkClipboardClass *class)
/**
* GtkClipboard::owner-change:
* @clipboard: the #GtkClipboard on which the signal is emitted
* @event: (type Gdk.EventOwnerChange): the @GdkEventOwnerChange event
* @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
* 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),
......@@ -237,7 +304,7 @@ gtk_clipboard_finalize (GObject *object)
if (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);
......@@ -261,9 +328,8 @@ clipboard_display_closed (GdkDisplay *display,
/**
* 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.
*
* @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.
......@@ -289,13 +355,11 @@ clipboard_display_closed (GdkDisplay *display,
* 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: (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.
* 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
**/
......
......@@ -34,23 +34,73 @@ G_BEGIN_DECLS
#define GTK_CLIPBOARD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_CLIPBOARD, GtkClipboard))
#define GTK_IS_CLIPBOARD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_CLIPBOARD))
/**
* GtkClipboardReceivedFunc:
* @clipboard: the #GtkClipboard
* @selection_data: a #GtkSelectionData containing the data was received.
* If retrieving the data failed, then then length field
* of @selection_data will be negative.
* @data: the @user_data supplied to gtk_clipboard_request_contents().
*
* A function to be called when the results of gtk_clipboard_request_contents()
* are received, or when the request fails.
*/
typedef void (* GtkClipboardReceivedFunc) (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
gpointer data);
/**
* GtkClipboardTextReceivedFunc:
* @clipboard: the #GtkClipboard
* @text: the text received, as a UTF-8 encoded string, or %NULL
* if retrieving the data failed.
* @data: the @user_data supplied to gtk_clipboard_request_text().
*
* A function to be called when the results of gtk_clipboard_request_text()
* are received, or when the request fails.
*/
typedef void (* GtkClipboardTextReceivedFunc) (GtkClipboard *clipboard,
const gchar *text,
gpointer data);
typedef void (* GtkClipboardRichTextReceivedFunc) (GtkClipboard *clipboard,
GdkAtom format,
const guint8 *text,
gsize length,
gpointer data);
/**
* GtkClipboardImageReceivedFunc:
* @clipboard: the #GtkClipboard
* @pixbuf: the received image
* @data: the @user_data supplied to gtk_clipboard_request_image().
*
* A function to be called when the results of gtk_clipboard_request_image()
* are received, or when the request fails.
*
* Since: 2.6
*/
typedef void (* GtkClipboardImageReceivedFunc) (GtkClipboard *clipboard,
GdkPixbuf *pixbuf,
gpointer data);
typedef void (* GtkClipboardURIReceivedFunc) (GtkClipboard *clipboard,
gchar **uris,
gpointer data);
/**
* GtkClipboardTargetsReceivedFunc:
* @clipboard: the #GtkClipboard
* @atoms: the supported targets, as array of #GdkAtom, or %NULL
* if retrieving the data failed.
* @n_atoms: the length of the @atoms array.
* @data: the @user_data supplied to gtk_clipboard_request_targets().
*
* A function to be called when the results of gtk_clipboard_request_targets()
* are received, or when the request fails.
*
* Since: 2.4
*/
typedef void (* GtkClipboardTargetsReceivedFunc) (GtkClipboard *clipboard,
GdkAtom *atoms,
gint n_atoms,
......@@ -60,10 +110,42 @@ typedef void (* GtkClipboardTargetsReceivedFunc) (GtkClipboard *clipboard,
* right now for ClearFunc, you may have trouble determining _which_ clipboard
* was cleared, if you reuse your ClearFunc for multiple clipboards.
*/
/**
* GtkClipboardGetFunc:
* @clipboard: the #GtkClipboard
* @selection_data: a #GtkSelectionData argument in which the requested
* data should be stored.
* @info: the info field corresponding to the requested target from the
* #GtkTargetEntry array passed to gtk_clipboard_set_with_data() or
* gtk_clipboard_set_with_owner().
* @user_data_or_owner: the @user_data argument passed to
* gtk_clipboard_set_with_data(), or the @owner argument passed to
* gtk_clipboard_set_with_owner()
*
* A function that will be called to provide the contents of the selection.
* If multiple types of data were advertised, the requested type can
* be determined from the @info parameter or by checking the target field
* of @selection_data. If the data could successfully be converted into
* then it should be stored into the @selection_data object by
* calling gtk_selection_data_set() (or related functions such
* as gtk_selection_data_set_text()). If no data is set, the requestor
* will be informed that the attempt to get the data failed.
*/
typedef void (* GtkClipboardGetFunc) (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
guint info,
gpointer user_data_or_owner);
/**
* GtkClipboardClearFunc:
* @clipboard: the #GtkClipboard
* @user_data_or_owner: the @user_data argument passed to gtk_clipboard_set_with_data(),
* or the @owner argument passed to gtk_clipboard_set_with_owner()
*
* A function that will be called when the contents of the clipboard are changed
* or cleared. Once this has called, the @user_data_or_owner argument
* will not be used again.
*/
typedef void (* GtkClipboardClearFunc) (GtkClipboard *clipboard,
gpointer user_data_or_owner);
......
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