GdkScreen

typedef struct _GdkScreen GdkScreen;

This is a currently just a placeholder typedef for the first argument of the window_at_pointer function in GdkPointerHooks. It will be used when GDK gets multihead support.

Since 2.2

gdk_screen_get_default ()

GdkScreen *         gdk_screen_get_default              (void);

Gets the default screen for the default display. (See gdk_display_get_default()).

Since 2.2

gdk_screen_get_default_colormap ()

GdkColormap *       gdk_screen_get_default_colormap     (GdkScreen *screen);

Gets the default colormap for screen.

Since 2.2

gdk_screen_set_default_colormap ()

void                gdk_screen_set_default_colormap     (GdkScreen *screen,
                                                         GdkColormap *colormap);

Sets the default colormap for screen.

Since 2.2

gdk_screen_get_system_colormap ()

GdkColormap *       gdk_screen_get_system_colormap      (GdkScreen *screen);

Gets the system's default colormap for screen

Since 2.2

gdk_screen_get_system_visual ()

GdkVisual *         gdk_screen_get_system_visual        (GdkScreen *screen);

Get the system's default visual for screen. This is the visual for the root window of the display. The return value should not be freed.

Since 2.2

gdk_screen_get_rgb_colormap ()

GdkColormap *       gdk_screen_get_rgb_colormap         (GdkScreen *screen);

Gets the preferred colormap for rendering image data on screen. Not a very useful function; historically, GDK could only render RGB image data to one colormap and visual, but in the current version it can render to any colormap and visual. So there's no need to call this function.

Since 2.2

gdk_screen_get_rgb_visual ()

GdkVisual *         gdk_screen_get_rgb_visual           (GdkScreen *screen);

Gets a "preferred visual" chosen by GdkRGB for rendering image data on screen. In previous versions of GDK, this was the only visual GdkRGB could use for rendering. In current versions, it's simply the visual GdkRGB would have chosen as the optimal one in those previous versions. GdkRGB can now render to drawables with any visual.

Since 2.2

gdk_screen_get_rgba_colormap ()

GdkColormap *       gdk_screen_get_rgba_colormap        (GdkScreen *screen);

Gets a colormap to use for creating windows or pixmaps with an alpha channel. The windowing system on which GTK+ is running may not support this capability, in which case NULL will be returned. Even if a non-NULL value is returned, its possible that the window's alpha channel won't be honored when displaying the window on the screen: in particular, for X an appropriate windowing manager and compositing manager must be running to provide appropriate display.

This functionality is not implemented in the Windows backend.

For setting an overall opacity for a top-level window, see gdk_window_set_opacity().

Since 2.8

gdk_screen_get_rgba_visual ()

GdkVisual *         gdk_screen_get_rgba_visual          (GdkScreen *screen);

Gets a visual to use for creating windows or pixmaps with an alpha channel. See the docs for gdk_screen_get_rgba_colormap() for caveats.

Since 2.8

gdk_screen_is_composited ()

gboolean            gdk_screen_is_composited            (GdkScreen *screen);

Returns whether windows with an RGBA visual can reasonably be expected to have their alpha channel drawn correctly on the screen.

On X11 this function returns whether a compositing manager is compositing screen.

Since 2.10

gdk_screen_get_root_window ()

GdkWindow *         gdk_screen_get_root_window          (GdkScreen *screen);

Gets the root window of screen.

Since 2.2

gdk_screen_get_display ()

GdkDisplay *        gdk_screen_get_display              (GdkScreen *screen);

Gets the display to which the screen belongs.

Since 2.2

gdk_screen_get_number ()

gint                gdk_screen_get_number               (GdkScreen *screen);

Gets the index of screen among the screens in the display to which it belongs. (See gdk_screen_get_display())

Since 2.2

gdk_screen_get_width ()

gint                gdk_screen_get_width                (GdkScreen *screen);

Gets the width of screen in pixels

Since 2.2

gdk_screen_get_height ()

gint                gdk_screen_get_height               (GdkScreen *screen);

Gets the height of screen in pixels

Since 2.2

gdk_screen_get_width_mm ()

gint                gdk_screen_get_width_mm             (GdkScreen *screen);

Gets the width of screen in millimeters. Note that on some X servers this value will not be correct.

Since 2.2

gdk_screen_get_height_mm ()

gint                gdk_screen_get_height_mm            (GdkScreen *screen);

Returns the height of screen in millimeters. Note that on some X servers this value will not be correct.

Since 2.2

gdk_screen_list_visuals ()

GList *             gdk_screen_list_visuals             (GdkScreen *screen);

Lists the available visuals for the specified screen. A visual describes a hardware image data format. For example, a visual might support 24-bit color, or 8-bit color, and might expect pixels to be in a certain format.

Call g_list_free() on the return value when you're finished with it.

Since 2.2

gdk_screen_get_toplevel_windows ()

GList *             gdk_screen_get_toplevel_windows     (GdkScreen *screen);

Obtains a list of all toplevel windows known to GDK on the screen screen. A toplevel window is a child of the root window (see gdk_get_default_root_window()).

The returned list should be freed with g_list_free(), but its elements need not be freed.

Since 2.2

gdk_screen_make_display_name ()

gchar *             gdk_screen_make_display_name        (GdkScreen *screen);

Determines the name to pass to gdk_display_open() to get a GdkDisplay with this screen as the default screen.

Since 2.2

gdk_screen_get_n_monitors ()

gint                gdk_screen_get_n_monitors           (GdkScreen *screen);

Returns the number of monitors which screen consists of.

Since 2.2

gdk_screen_get_primary_monitor ()

gint                gdk_screen_get_primary_monitor      (GdkScreen *screen);

Gets the primary monitor for screen. The primary monitor is considered the monitor where the 'main desktop' lives. While normal application windows typically allow the window manager to place the windows, specialized desktop applications such as panels should place themselves on the primary monitor.

If no primary monitor is configured by the user, the return value will be 0, defaulting to the first monitor.

Since 2.20

gdk_screen_get_monitor_geometry ()

void                gdk_screen_get_monitor_geometry     (GdkScreen *screen,
                                                         gint monitor_num,
                                                         GdkRectangle *dest);

Retrieves the GdkRectangle representing the size and position of the individual monitor within the entire screen area.

Note that the size of the entire screen area can be retrieved via gdk_screen_get_width() and gdk_screen_get_height().

Since 2.2

gdk_screen_get_monitor_at_point ()

gint                gdk_screen_get_monitor_at_point     (GdkScreen *screen,
                                                         gint x,
                                                         gint y);

Returns the monitor number in which the point (x,y) is located.

Since 2.2

gdk_screen_get_monitor_at_window ()

gint                gdk_screen_get_monitor_at_window    (GdkScreen *screen,
                                                         GdkWindow *window);

Returns the number of the monitor in which the largest area of the bounding rectangle of window resides.

Since 2.2

gdk_screen_get_monitor_height_mm ()

gint                gdk_screen_get_monitor_height_mm    (GdkScreen *screen,
                                                         gint monitor_num);

Gets the height in millimeters of the specified monitor.

Since 2.14

gdk_screen_get_monitor_width_mm ()

gint                gdk_screen_get_monitor_width_mm     (GdkScreen *screen,
                                                         gint monitor_num);

Gets the width in millimeters of the specified monitor, if available.

Since 2.14

gdk_screen_get_monitor_plug_name ()

gchar *             gdk_screen_get_monitor_plug_name    (GdkScreen *screen,
                                                         gint monitor_num);

Returns the output name of the specified monitor. Usually something like VGA, DVI, or TV, not the actual product name of the display device.

Since 2.14

gdk_screen_broadcast_client_message ()

void                gdk_screen_broadcast_client_message (GdkScreen *screen,
                                                         GdkEvent *event);

On X11, sends an X ClientMessage event to all toplevel windows on screen.

Toplevel windows are determined by checking for the WM_STATE property, as described in the Inter-Client Communication Conventions Manual (ICCCM). If no windows are found with the WM_STATE property set, the message is sent to all children of the root window.

On Windows, broadcasts a message registered with the name GDK_WIN32_CLIENT_MESSAGE to all top-level windows. The amount of data is limited to one long, i.e. four bytes.

Since 2.2

gdk_screen_get_setting ()

gboolean            gdk_screen_get_setting              (GdkScreen *screen,
                                                         const gchar *name,
                                                         GValue *value);

Retrieves a desktop-wide setting such as double-click time for the GdkScreen screen.

FIXME needs a list of valid settings here, or a link to more information.

Since 2.2

gdk_screen_get_font_options ()

const cairo_font_options_t * gdk_screen_get_font_options
                                                        (GdkScreen *screen);

Gets any options previously set with gdk_screen_set_font_options().

Since 2.10

gdk_screen_set_font_options ()

void                gdk_screen_set_font_options         (GdkScreen *screen,
                                                         const cairo_font_options_t *options);

Sets the default font options for the screen. These options will be set on any PangoContext's newly created with gdk_pango_context_get_for_screen(). Changing the default set of font options does not affect contexts that have already been created.

Since 2.10

gdk_screen_get_resolution ()

gdouble             gdk_screen_get_resolution           (GdkScreen *screen);

Gets the resolution for font handling on the screen; see gdk_screen_set_resolution() for full details.

Since 2.10

gdk_screen_set_resolution ()

void                gdk_screen_set_resolution           (GdkScreen *screen,
                                                         gdouble dpi);

Sets the resolution for font handling on the screen. This is a scale factor between points specified in a PangoFontDescription and cairo units. The default value is 96, meaning that a 10 point font will be 13 units high. (10 * 96. / 72. = 13.3).

Since 2.10

gdk_screen_get_active_window ()

GdkWindow *         gdk_screen_get_active_window        (GdkScreen *screen);

Returns the screen's currently active window.

On X11, this is done by inspecting the _NET_ACTIVE_WINDOW property on the root window, as described in the Extended Window Manager Hints. If there is no currently currently active window, or the window manager does not support the _NET_ACTIVE_WINDOW hint, this function returns NULL.

On other platforms, this function may return NULL, depending on whether it is implementable on that platform.

The returned window should be unrefed using g_object_unref() when no longer needed.

Since 2.10

gdk_screen_get_window_stack ()

GList *             gdk_screen_get_window_stack         (GdkScreen *screen);

Returns a GList of GdkWindows representing the current window stack.

On X11, this is done by inspecting the _NET_CLIENT_LIST_STACKING property on the root window, as described in the Extended Window Manager Hints. If the window manager does not support the _NET_CLIENT_LIST_STACKING hint, this function returns NULL.

On other platforms, this function may return NULL, depending on whether it is implementable on that platform.

The returned list is newly allocated and owns references to the windows it contains, so it should be freed using g_list_free() and its windows unrefed using g_object_unref() when no longer needed.

Since 2.10

gdk_spawn_on_screen ()

gboolean            gdk_spawn_on_screen                 (GdkScreen *screen,
                                                         const gchar *working_directory,
                                                         gchar **argv,
                                                         gchar **envp,
                                                         GSpawnFlags flags,
                                                         GSpawnChildSetupFunc child_setup,
                                                         gpointer user_data,
                                                         gint *child_pid,
                                                         GError **error);

Like g_spawn_async(), except the child process is spawned in such an environment that on calling gdk_display_open() it would be returned a GdkDisplay with screen as the default screen.

This is useful for applications which wish to launch an application on a specific screen.

Since 2.4

gdk_spawn_on_screen_with_pipes ()

gboolean            gdk_spawn_on_screen_with_pipes      (GdkScreen *screen,
                                                         const gchar *working_directory,
                                                         gchar **argv,
                                                         gchar **envp,
                                                         GSpawnFlags flags,
                                                         GSpawnChildSetupFunc child_setup,
                                                         gpointer user_data,
                                                         gint *child_pid,
                                                         gint *standard_input,
                                                         gint *standard_output,
                                                         gint *standard_error,
                                                         GError **error);

Like g_spawn_async_with_pipes(), except the child process is spawned in such an environment that on calling gdk_display_open() it would be returned a GdkDisplay with screen as the default screen.

This is useful for applications which wish to launch an application on a specific screen.

Since 2.4

gdk_spawn_command_line_on_screen ()

gboolean            gdk_spawn_command_line_on_screen    (GdkScreen *screen,
                                                         const gchar *command_line,
                                                         GError **error);

Like g_spawn_command_line_async(), except the child process is spawned in such an environment that on calling gdk_display_open() it would be returned a GdkDisplay with screen as the default screen.

This is useful for applications which wish to launch an application on a specific screen.

Since 2.4

The "font-options" property

  "font-options"             gpointer              : Read / Write

The default font options for the screen.

The "resolution" property

  "resolution"               gdouble               : Read / Write

The resolution for fonts on the screen.

Default value: -1

The "composited-changed" signal

void                user_function                      (GdkScreen *screen,
                                                        gpointer   user_data)      : Run Last

The ::composited-changed signal is emitted when the composited status of the screen changes

Since 2.10

The "monitors-changed" signal

void                user_function                      (GdkScreen *screen,
                                                        gpointer   user_data)      : Run Last

The ::monitors-changed signal is emitted when the number, size or position of the monitors attached to the screen change.

Only for X11 and OS X for now. A future implementation for Win32 may be a possibility.

Since 2.14

The "size-changed" signal

void                user_function                      (GdkScreen *screen,
                                                        gpointer   user_data)      : Run Last

The ::size-changed signal is emitted when the pixel width or height of a screen changes.

Since 2.2