mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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5b291073b0
* gdk-pixbuf/porting-from-imlib.sgml: GDK instead of Gdk.
* gdk-pixbuf/tmpl/gdk-pixbuf-xlib-init.sgml: Replace references to
deprecated functions.
* gdk/tmpl/event_structs.sgml, gdk/tmpl/gcs.sgml,
gdk/tmpl/images.sgml: Replace references to deprecated functions.
* gdk/tmpl/properties.sgml, gdk/tmpl/selections.sgml: Additions.
* gdk/x11/gdkproperty-x11.c, gdk/x11/gdkselection-x11.c:
Minor documentation tweaks.
479 lines
18 KiB
Plaintext
479 lines
18 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Event Structures
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<!-- ##### SECTION Short_Description ##### -->
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data structures specific to each type of event.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The event structs contain data specific to each type of event in GDK.
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</para>
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<note>
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<para>
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A common mistake is to forget to set the event mask of a widget so that the
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required events are received. See gtk_widget_set_events().
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</para>
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</note>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### UNION GdkEvent ##### -->
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<para>
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The #GdkEvent struct contains a union of all of the event structs,
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and allows access to the data fields in a number of ways.
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</para>
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<para>
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The event type is always the first field in all of the event structs, and
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can always be accessed with the following code, no matter what type of event
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it is:
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<informalexample>
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<programlisting>
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GdkEvent *event;
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GdkEventType type;
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type = event->type;
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</programlisting>
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</informalexample>
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</para>
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<para>
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To access other fields of the event structs, the pointer to the event can be
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cast to the appropriate event struct pointer, or the union member name can be
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used. For example if the event type is %GDK_BUTTON_PRESS then the x coordinate
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of the button press can be accessed with:
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<informalexample>
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<programlisting>
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GdkEvent *event;
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gdouble x;
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x = ((GdkEventButton*)event)->x;
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</programlisting>
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</informalexample>
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or:
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<informalexample>
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<programlisting>
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GdkEvent *event;
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gdouble x;
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x = event->button.x;
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</programlisting>
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</informalexample>
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</para>
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<!-- ##### STRUCT GdkEventAny ##### -->
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<para>
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Contains the fields which are common to all event structs.
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Any event pointer can safely be cast to a pointer to a #GdkEventAny to access
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these fields.
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</para>
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@type: the type of the event.
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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<!-- ##### STRUCT GdkEventKey ##### -->
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<para>
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Describes a key press or key release event.
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</para>
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@type: the type of the event (%GDK_KEY_PRESS or %GDK_KEY_RELEASE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@time: the time of the event in milliseconds.
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@state: a bit-mask representing the state of the modifier keys (e.g. Control,
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Shift and Alt) and the pointer buttons. See #GdkModifierType.
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@keyval: the key that was pressed or released. See the <filename><gdk/gdkkeysym.h></filename>
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header file for a complete list of GDK key codes.
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@length: the length of @string.
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@string: a nul-terminated multi-byte string containing the composed characters
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resulting from the key press. When text is being input, in a #GtkEntry for
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example, it is these characters which should be added to the input buffer.
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When using <link linkend="gdk-Input-Methods">Input Methods</link> to support
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internationalized text input, the composed characters appear here after the
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pre-editing has been completed.
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@hardware_keycode: the raw code of the key that was pressed or released.
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@group: the keyboard group.
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<!-- ##### STRUCT GdkEventButton ##### -->
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<para>
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Used for button press and button release events. The
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<structfield>type</structfield> field will be one of %GDK_BUTTON_PRESS,
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%GDK_2BUTTON_PRESS, %GDK_3BUTTON_PRESS, and %GDK_BUTTON_RELEASE.
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</para>
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<para>
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Double and triple-clicks result in a sequence of events being received.
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For double-clicks the order of events will be:
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<orderedlist>
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<listitem><para>%GDK_BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_BUTTON_RELEASE</para></listitem>
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<listitem><para>%GDK_BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_2BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_BUTTON_RELEASE</para></listitem>
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</orderedlist>
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Note that the first click is received just like a normal
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button press, while the second click results in a %GDK_2BUTTON_PRESS being
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received just after the %GDK_BUTTON_PRESS.
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</para>
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<para>
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Triple-clicks are very similar to double-clicks, except that %GDK_3BUTTON_PRESS
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is inserted after the third click. The order of the events is:
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<orderedlist>
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<listitem><para>%GDK_BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_BUTTON_RELEASE</para></listitem>
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<listitem><para>%GDK_BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_2BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_BUTTON_RELEASE</para></listitem>
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<listitem><para>%GDK_BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_3BUTTON_PRESS</para></listitem>
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<listitem><para>%GDK_BUTTON_RELEASE</para></listitem>
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</orderedlist>
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</para>
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<para>
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For a double click to occur, the second button press must occur within 1/4 of
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a second of the first. For a triple click to occur, the third button press
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must also occur within 1/2 second of the first button press.
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</para>
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@type: the type of the event (%GDK_BUTTON_PRESS, %GDK_2BUTTON_PRESS,
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%GDK_3BUTTON_PRESS or %GDK_BUTTON_RELEASE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@time: the time of the event in milliseconds.
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@x: the x coordinate of the pointer relative to the window.
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@y: the y coordinate of the pointer relative to the window.
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@axes: @x, @y translated to the axes of @device, or %NULL if @device is
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the mouse.
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@state: a bit-mask representing the state of the modifier keys (e.g. Control,
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Shift and Alt) and the pointer buttons. See #GdkModifierType.
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@button: the button which was pressed or released, numbered from 1 to 5.
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Normally button 1 is the left mouse button, 2 is the middle button,
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and 3 is the right button. On 2-button mice, the middle button can often
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be simulated by pressing both mouse buttons together.
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@device: the device where the event originated.
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@x_root: the x coordinate of the pointer relative to the root of the screen.
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@y_root: the y coordinate of the pointer relative to the root of the screen.
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<!-- ##### STRUCT GdkEventScroll ##### -->
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<para>
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Generated from button presses for the buttons 4 to 7. Wheel mice are
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usually configured to generate button press events for buttons 4 and 5
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when the wheel is turned.
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</para>
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@type: the type of the event (%GDK_SCROLL).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@time: the time of the event in milliseconds.
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@x: the x coordinate of the pointer relative to the window.
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@y: the y coordinate of the pointer relative to the window.
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@state: a bit-mask representing the state of the modifier keys (e.g. Control,
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Shift and Alt) and the pointer buttons. See #GdkModifierType.
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@direction: the direction to scroll to (one of %GDK_SCROLL_UP,
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%GDK_SCROLL_DOWN, %GDK_SCROLL_LEFT and %GDK_SCROLL_RIGHT).
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@device: the device where the event originated.
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@x_root: the x coordinate of the pointer relative to the root of the screen.
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@y_root: the y coordinate of the pointer relative to the root of the screen.
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<!-- ##### STRUCT GdkEventMotion ##### -->
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<para>
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Generated when the pointer moves.
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</para>
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@type: the type of the event.
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@time: the time of the event in milliseconds.
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@x: the x coordinate of the pointer relative to the window.
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@y: the y coordinate of the pointer relative to the window.
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@axes: @x, @y translated to the axes of @device, or %NULL if @device is
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the mouse.
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@state: a bit-mask representing the state of the modifier keys (e.g. Control,
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Shift and Alt) and the pointer buttons. See #GdkModifierType.
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@is_hint:
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@device: the device where the event originated.
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@x_root: the x coordinate of the pointer relative to the root of the screen.
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@y_root: the y coordinate of the pointer relative to the root of the screen.
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<!-- ##### STRUCT GdkEventExpose ##### -->
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<para>
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Generated when all or part of a window becomes visible and needs to be
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redrawn.
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</para>
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@type: the type of the event (%GDK_EXPOSE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@area: bounding box of @region.
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@region: the region that needs to be redrawn.
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@count: the number of contiguous %GDK_EXPOSE events following this one.
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The only use for this is "exposure compression", i.e. handling all contiguous
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%GDK_EXPOSE events in one go, though GDK performs some exposure compression
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so this is not normally needed.
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<!-- ##### STRUCT GdkEventVisibility ##### -->
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<para>
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Generated when the window visibility status has changed.
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</para>
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@type: the type of the event (%GDK_VISIBILITY_NOTIFY).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@state: the new visibility state (%GDK_VISIBILITY_FULLY_OBSCURED,
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%GDK_VISIBILITY_PARTIAL or %GDK_VISIBILITY_UNOBSCURED).
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<!-- ##### STRUCT GdkEventCrossing ##### -->
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<para>
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Generated when the pointer enters or leaves a window.
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</para>
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@type: the type of the event (%GDK_ENTER_NOTIFY or %GDK_LEAVE_NOTIFY).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using
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<function>XSendEvent</function>).
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@subwindow: the window that was entered or left.
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@time: the time of the event in milliseconds.
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@x: the x coordinate of the pointer relative to the window.
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@y: the y coordinate of the pointer relative to the window.
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@x_root: the x coordinate of the pointer relative to the root of the screen.
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@y_root: the y coordinate of the pointer relative to the root of the screen.
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@mode: the crossing mode (%GDK_CROSSING_NORMAL, %GDK_CROSSING_GRAB or
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%GDK_CROSSING_UNGRAB).
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@detail: the kind of crossing that happened (%GDK_NOTIFY_INFERIOR,
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%GDK_NOTIFY_ANCESTOR, %GDK_NOTIFY_VIRTUAL, %GDK_NOTIFY_NONLINEAR or
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%GDK_NOTIFY_NONLINEAR_VIRTUAL).
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@focus: %TRUE if @window is the focus window or an inferior.
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@state: a bit-mask representing the state of the modifier keys (e.g. Control,
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Shift and Alt) and the pointer buttons. See #GdkModifierType.
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<!-- ##### STRUCT GdkEventFocus ##### -->
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<para>
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Describes a change of keyboard focus.
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</para>
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@type: the type of the event (%GDK_FOCUS_CHANGE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@in: %TRUE if the window has gained the keyboard focus, %FALSE if it has lost
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the focus.
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<!-- ##### STRUCT GdkEventConfigure ##### -->
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<para>
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Generated when a window size or position has changed.
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</para>
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@type: the type of the event (%GDK_CONFIGURE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@x: the new x coordinate of the window, relative to its parent.
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@y: the new y coordinate of the window, relative to its parent.
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@width: the new width of the window.
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@height: the new height of the window.
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<!-- ##### STRUCT GdkEventProperty ##### -->
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<para>
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Describes a property change on a window.
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</para>
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@type: the type of the event (%GDK_PROPERTY_NOTIFY).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@atom: the property that was changed.
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@time: the time of the event in milliseconds.
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@state: whether the property was changed (%GDK_PROPERTY_NEW_VALUE) or
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deleted (%GDK_PROPERTY_DELETE).
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<!-- ##### STRUCT GdkEventSelection ##### -->
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<para>
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Generated when a selection is requested or ownership of a selection
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is taken over by another client application.
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</para>
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@type: the type of the event (%GDK_SELECTION_CLEAR, %GDK_SELECTION_NOTIFY or
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%GDK_SELECTION_REQUEST).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@selection: the selection.
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@target: the target to which the selection should be converted.
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@property: the property in which to place the result of the conversion.
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@time: the time of the event in milliseconds.
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@requestor: the native window on which to place @property.
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<!-- ##### TYPEDEF GdkNativeWindow ##### -->
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<para>
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Used to represent native windows (<type>Window</type>s for the X11 backend,
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<type>HWND</type>s for Win32).
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</para>
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<!-- ##### STRUCT GdkEventDND ##### -->
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<para>
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Generated during DND operations.
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</para>
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@type: the type of the event (%GDK_DRAG_ENTER, %GDK_DRAG_LEAVE,
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%GDK_DRAG_MOTION, %GDK_DRAG_STATUS, %GDK_DROP_START or %GDK_DROP_FINISHED).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@context: the #GdkDragContext for the current DND operation.
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@time: the time of the event in milliseconds.
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@x_root: the x coordinate of the pointer relative to the root of the screen,
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only set for %GDK_DRAG_MOTION and %GDK_DROP_START.
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@y_root: the y coordinate of the pointer relative to the root of the screen,
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only set for %GDK_DRAG_MOTION and %GDK_DROP_START.
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<!-- ##### STRUCT GdkEventProximity ##### -->
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<para>
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Proximity events are generated when using GDK's wrapper for the
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XInput extension. The XInput extension is an add-on for standard X
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that allows you to use nonstandard devices such as graphics tablets.
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A proximity event indicates that the stylus has moved in or out of
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contact with the tablet, or perhaps that the user's finger has moved
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in or out of contact with a touch screen.
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</para>
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@type: the type of the event (%GDK_PROXIMITY_IN or %GDK_PROXIMITY_OUT).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@time: the time of the event in milliseconds.
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@device: the device where the event originated.
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<!-- ##### STRUCT GdkEventClient ##### -->
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<para>
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An event sent by another client application.
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</para>
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@type: the type of the event (%GDK_CLIENT_EVENT).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@message_type: the type of the message, which can be defined by the
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application.
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@data_format: the format of the data, given as the number of bits in each
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data element, i.e. 8, 16, or 32. 8-bit data uses the b array of the data
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union, 16-bit data uses the s array, and 32-bit data uses the l array.
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<!-- ##### STRUCT GdkEventNoExpose ##### -->
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<para>
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Generated when the area of a #GdkDrawable being copied, with gdk_draw_drawable()
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or gdk_window_copy_area(), was completely available.
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</para>
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<para>
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FIXME: add more here.
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</para>
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@type: the type of the event (%GDK_NO_EXPOSE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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<!-- ##### STRUCT GdkEventWindowState ##### -->
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<para>
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Generated when the state of a toplevel window changes.
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</para>
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@type: the type of the event (%GDK_WINDOW_STATE).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@changed_mask: mask specifying what flags have changed.
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@new_window_state: the new window state, a combination of #GdkWindowState bits.
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<!-- ##### STRUCT GdkEventSetting ##### -->
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<para>
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Generated when a setting is modified.
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</para>
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@type: the type of the event (%GDK_SETTING).
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@window: the window which received the event.
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@send_event: %TRUE if the event was sent explicitly (e.g. using <function>XSendEvent</function>).
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@action: what happened to the setting (%GDK_SETTING_ACTION_NEW,
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%GDK_SETTING_ACTION_CHANGED or %GDK_SETTING_ACTION_DELETED).
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@name: the name of the setting.
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<!-- ##### ENUM GdkScrollDirection ##### -->
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<para>
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Specifies the direction for #GdkEventScroll.
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</para>
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@GDK_SCROLL_UP: the window is scrolled up.
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@GDK_SCROLL_DOWN: the window is scrolled down.
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@GDK_SCROLL_LEFT: the window is scrolled to the left.
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@GDK_SCROLL_RIGHT: the window is scrolled to the right.
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<!-- ##### ENUM GdkVisibilityState ##### -->
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<para>
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Specifies the visiblity status of a window for a #GdkEventVisibility.
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</para>
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@GDK_VISIBILITY_UNOBSCURED: the window is completely visible.
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@GDK_VISIBILITY_PARTIAL: the window is partially visible.
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@GDK_VISIBILITY_FULLY_OBSCURED: the window is not visible at all.
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<!-- ##### ENUM GdkCrossingMode ##### -->
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<para>
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Specifies the crossing mode for #GdkEventCrossing.
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</para>
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@GDK_CROSSING_NORMAL: crossing because of pointer motion.
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@GDK_CROSSING_GRAB: crossing because a grab is activated.
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|
@GDK_CROSSING_UNGRAB: crossing because a grab is deactivated.
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|
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|
<!-- ##### ENUM GdkNotifyType ##### -->
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|
<para>
|
|
Specifies the kind of crossing for #GdkEventCrossing.
|
|
</para>
|
|
<para>
|
|
See the X11 protocol specification of <type>LeaveNotify</type> for
|
|
full details of crossing event generation.
|
|
</para>
|
|
|
|
@GDK_NOTIFY_ANCESTOR: the window is entered from an ancestor or
|
|
left towards an ancestor.
|
|
@GDK_NOTIFY_VIRTUAL: the pointer moves between an ancestor and an
|
|
inferior of the window.
|
|
@GDK_NOTIFY_INFERIOR: the window is entered from an inferior or
|
|
left towards an inferior.
|
|
@GDK_NOTIFY_NONLINEAR: the window is entered from or left towards
|
|
a window which is neither an ancestor nor an inferior.
|
|
@GDK_NOTIFY_NONLINEAR_VIRTUAL: the pointer moves between two windows
|
|
which are not ancestors of each other and the window is part of
|
|
the ancestor chain between one of these windows and their least
|
|
common ancestor.
|
|
@GDK_NOTIFY_UNKNOWN:
|
|
|
|
<!-- ##### ENUM GdkPropertyState ##### -->
|
|
<para>
|
|
Specifies the type of a property change for a #GdkEventProperty.
|
|
</para>
|
|
|
|
@GDK_PROPERTY_NEW_VALUE: the property value was changed.
|
|
@GDK_PROPERTY_DELETE: the property was deleted.
|
|
|
|
<!-- ##### ENUM GdkWindowState ##### -->
|
|
<para>
|
|
Specifies the state of a toplevel window.
|
|
</para>
|
|
|
|
@GDK_WINDOW_STATE_WITHDRAWN: the window is not shown.
|
|
@GDK_WINDOW_STATE_ICONIFIED: the window is minimized.
|
|
@GDK_WINDOW_STATE_MAXIMIZED: the window is maximized.
|
|
@GDK_WINDOW_STATE_STICKY: the window is sticky.
|
|
|
|
<!-- ##### ENUM GdkSettingAction ##### -->
|
|
<para>
|
|
Specifies the kind of modification applied to a setting in a #GdkEventSetting.
|
|
</para>
|
|
|
|
@GDK_SETTING_ACTION_NEW: a setting was added.
|
|
@GDK_SETTING_ACTION_CHANGED: a setting was changed.
|
|
@GDK_SETTING_ACTION_DELETED: a setting was deleted.
|
|
|