forked from AuroraMiddleware/gtk
390 lines
8.0 KiB
Plaintext
390 lines
8.0 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Selections
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<!-- ##### SECTION Short_Description ##### -->
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Functions for handling inter-process communication via selections
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The selection mechanism provides the basis for different types
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of communication between processes. In particular, drag and drop and
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#GtkClipboard work via selections. You will very seldom or
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never need to use most of the functions in this section directly;
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#GtkClipboard provides a nicer interface to the same functionality.
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</para>
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<para>
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Some of the datatypes defined this section are used in
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the #GtkClipboard and drag-and-drop API's as well. The
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#GtkTargetEntry structure and #GtkTargetList objects represent
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lists of data types that are supported when sending or
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receiving data. The #GtkSelectionData object is used to
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store a chunk of data along with the data type and other
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associated information.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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<variablelist>
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<varlistentry>
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<term>#GtkWidget</term>
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<listitem><para>Much of the operation of selections happens via
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signals for #GtkWidget. In particular, if you are
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using the functions in this section, you may need
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to pay attention to ::selection_get,
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::selection_received, and :selection_clear_event
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signals.</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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<!-- ##### STRUCT GtkTargetEntry ##### -->
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<para>
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A #GtkTargetEntry structure represents a single type of
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data than can be supplied for by a widget for a selection
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or for supplied or received during drag-and-drop. It
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contains a string representing the drag type, a flags
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field (used only for drag and drop - see #GtkTargetFlags),
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and an application assigned integer ID. The integer
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ID will later be passed as a signal parameter for signals
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like "selection_get". It allows the application to identify
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the target type without extensive string compares.
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</para>
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@target:
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@flags:
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@info:
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<!-- ##### STRUCT GtkTargetList ##### -->
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<para>
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A #GtkTargetList structure is a reference counted list
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of #GtkTargetPair. It is used to represent the same
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information as a table of #GtkTargetEntry, but in
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an efficient form. This structure should be treated as
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opaque.
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</para>
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@list:
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@ref_count:
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<!-- ##### STRUCT GtkTargetPair ##### -->
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<para>
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Internally used structure in the drag-and-drop and
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selection handling code.
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</para>
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@target:
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@flags:
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@info:
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<!-- ##### FUNCTION gtk_target_list_new ##### -->
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<para>
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Creates a new #GtkTargetList from an array of #GtkTargetEntry.
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</para>
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@targets: Pointer to an array of #GtkTargetEntry
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@ntargets: number of entries in @targets.
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@Returns: the new #GtkTargetList.
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<!-- ##### FUNCTION gtk_target_list_ref ##### -->
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<para>
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Increases the reference count of a #GtkTargetList by one.
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</para>
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@list: a #GtkTargetList
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<!-- ##### FUNCTION gtk_target_list_unref ##### -->
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<para>
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Decreases the reference count of a #GtkTargetList by one.
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If the resulting reference count is zero, frees the list.
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</para>
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@list: a #GtkTargetList
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<!-- ##### FUNCTION gtk_target_list_add ##### -->
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<para>
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Adds another target to a #GtkTargetList.
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</para>
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@list: a #GtkTargetList
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@target: the interned atom representing the target
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@flags: the flags for this target
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@info: an ID that will be passed back to the application
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<!-- ##### FUNCTION gtk_target_list_add_table ##### -->
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<para>
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Adds a table of #GtkTargetEntry into a target list.
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</para>
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@list: a #GtkTargetList
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@targets: the table of #GtkTargetEntry
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@ntargets: number of targets in the table
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<!-- ##### FUNCTION gtk_target_list_add_text_targets ##### -->
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<para>
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</para>
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@list:
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@info:
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<!-- ##### FUNCTION gtk_target_list_add_image_targets ##### -->
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<para>
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</para>
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@list:
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@info:
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@writable:
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<!-- ##### FUNCTION gtk_target_list_add_uri_targets ##### -->
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<para>
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</para>
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@list:
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@info:
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<!-- ##### FUNCTION gtk_target_list_remove ##### -->
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<para>
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Removes a target from a target list.
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</para>
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@list: a #GtkTargetList
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@target: the interned atom representing the target
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<!-- ##### FUNCTION gtk_target_list_find ##### -->
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<para>
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Looks up a given target in a #GtkTargetList.
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</para>
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@list: a #GtkTargetList
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@target: an interned atom representing the target to search for
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@info: a pointer to the location to store application info for target
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@Returns: %TRUE if the target was found, otherwise %FALSE
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<!-- ##### FUNCTION gtk_selection_owner_set ##### -->
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<para>
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</para>
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@widget:
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@selection:
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@time_:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_owner_set_for_display ##### -->
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<para>
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</para>
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@display:
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@widget:
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@selection:
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@time_:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_add_target ##### -->
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<para>
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Adds specified target to the list of supported targets for a
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given widget and selection.
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</para>
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@widget: a #GtkTarget
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@selection: the selection
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@target: target to add.
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@info: A unsigned integer which will be passed back to the application.
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<!-- ##### FUNCTION gtk_selection_add_targets ##### -->
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<para>
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Adds a table of targets to the list of supported targets
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for a given widget and selection.
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</para>
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@widget: a #GtkWidget
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@selection: the selection
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@targets: a table of targets to add
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@ntargets: number of entries in @targets
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<!-- ##### FUNCTION gtk_selection_clear_targets ##### -->
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<para>
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</para>
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@widget:
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@selection:
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<!-- ##### FUNCTION gtk_selection_convert ##### -->
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<para>
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Requests the contents of a selection. When received,
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a "selection_received" signal will be generated.
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</para>
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@widget: The widget which acts as requestor
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@selection: Which selection to get
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@target: Form of information desired (e.g., STRING)
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@time_: Time of request (usually of triggering event)
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In emergency, you could use #GDK_CURRENT_TIME
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@Returns: %TRUE if requested succeeded. %FALSE if we could not process
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request. (e.g., there was already a request in process for
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this widget).
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<!-- ##### FUNCTION gtk_selection_data_set ##### -->
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<para>
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Stores new data into a #GtkSelectionData object. Should
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<emphasis>only</emphasis> be called from a selection handler callback.
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Zero-terminates the stored data.
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</para>
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@selection_data:
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@type: the type of selection data
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@format: format (number of bits in a unit)
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@data: pointer to the data (will be copied)
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@length: length of the data
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<!-- ##### FUNCTION gtk_selection_data_set_text ##### -->
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<para>
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</para>
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@selection_data:
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@str:
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@len:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_get_text ##### -->
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<para>
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</para>
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@selection_data:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_set_pixbuf ##### -->
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<para>
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</para>
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@selection_data:
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@pixbuf:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_get_pixbuf ##### -->
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<para>
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</para>
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@selection_data:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_set_uris ##### -->
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<para>
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</para>
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@selection_data:
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@uris:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_get_uris ##### -->
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<para>
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</para>
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@selection_data:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_get_targets ##### -->
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<para>
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</para>
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@selection_data:
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@targets:
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@n_atoms:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_targets_include_image ##### -->
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<para>
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</para>
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@selection_data:
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@writable:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_targets_include_text ##### -->
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<para>
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</para>
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@selection_data:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_remove_all ##### -->
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<para>
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Removes all handlers and unsets ownership of all
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selections for a widget. Called when widget is being
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destroyed. This function will not generally be
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called by applications.
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</para>
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@widget: a #GtkWidget
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<!-- ##### FUNCTION gtk_selection_clear ##### -->
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<para>
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</para>
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@widget:
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@event:
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@Returns:
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<!-- ##### FUNCTION gtk_selection_data_copy ##### -->
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<para>
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Makes a copy of a #GtkSelectionData structure and its data.
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</para>
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@data: a pointer to a #GtkSelectionData structure.
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@Returns: a pointer to a copy of @data.
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<!-- ##### FUNCTION gtk_selection_data_free ##### -->
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<para>
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Frees a #GtkSelectionData structure returned from
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gtk_selection_data_copy().
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</para>
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@data: a pointer to a #GtkSelectionData structure.
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