/* * gdkscreen.c * * Copyright 2001 Sun Microsystems Inc. * * Erwann Chenede * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library. If not, see . */ #include "config.h" #include "gdkinternals.h" #include "gdkscreenprivate.h" #include "gdkrectangle.h" #include "gdkwindow.h" #include "gdkintl.h" /** * SECTION:gdkscreen * @Short_description: Object representing a physical screen * @Title: GdkScreen * * #GdkScreen objects are the GDK representation of the screen on * which windows can be displayed and on which the pointer moves. * X originally identified screens with physical screens, but * nowadays it is more common to have a single #GdkScreen which * combines several physical monitors (see gdk_screen_get_n_monitors()). * * GdkScreen is used throughout GDK and GTK+ to specify which screen * the top level windows are to be displayed on. it is also used to * query the screen specification and default settings such as * the default visual (gdk_screen_get_system_visual()), the dimensions * of the physical monitors (gdk_screen_get_monitor_geometry()), etc. */ static void gdk_screen_finalize (GObject *object); static void gdk_screen_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gdk_screen_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); enum { PROP_0, PROP_FONT_OPTIONS, PROP_RESOLUTION }; enum { SIZE_CHANGED, COMPOSITED_CHANGED, MONITORS_CHANGED, LAST_SIGNAL }; static guint signals[LAST_SIGNAL] = { 0 }; G_DEFINE_TYPE (GdkScreen, gdk_screen, G_TYPE_OBJECT) static void gdk_screen_class_init (GdkScreenClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); object_class->finalize = gdk_screen_finalize; object_class->set_property = gdk_screen_set_property; object_class->get_property = gdk_screen_get_property; g_object_class_install_property (object_class, PROP_FONT_OPTIONS, g_param_spec_pointer ("font-options", P_("Font options"), P_("The default font options for the screen"), G_PARAM_READWRITE|G_PARAM_STATIC_NAME| G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB)); g_object_class_install_property (object_class, PROP_RESOLUTION, g_param_spec_double ("resolution", P_("Font resolution"), P_("The resolution for fonts on the screen"), -G_MAXDOUBLE, G_MAXDOUBLE, -1.0, G_PARAM_READWRITE|G_PARAM_STATIC_NAME| G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB)); /** * GdkScreen::size-changed: * @screen: the object on which the signal is emitted * * The ::size-changed signal is emitted when the pixel width or * height of a screen changes. * * Since: 2.2 */ signals[SIZE_CHANGED] = g_signal_new (g_intern_static_string ("size-changed"), G_OBJECT_CLASS_TYPE (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkScreenClass, size_changed), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); /** * GdkScreen::composited-changed: * @screen: the object on which the signal is emitted * * The ::composited-changed signal is emitted when the composited * status of the screen changes * * Since: 2.10 */ signals[COMPOSITED_CHANGED] = g_signal_new (g_intern_static_string ("composited-changed"), G_OBJECT_CLASS_TYPE (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkScreenClass, composited_changed), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); /** * GdkScreen::monitors-changed: * @screen: the object on which the signal is emitted * * 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 */ signals[MONITORS_CHANGED] = g_signal_new (g_intern_static_string ("monitors-changed"), G_OBJECT_CLASS_TYPE (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkScreenClass, monitors_changed), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); } static void gdk_screen_init (GdkScreen *screen) { screen->resolution = -1.; } static void gdk_screen_finalize (GObject *object) { GdkScreen *screen = GDK_SCREEN (object); if (screen->font_options) cairo_font_options_destroy (screen->font_options); G_OBJECT_CLASS (gdk_screen_parent_class)->finalize (object); } void _gdk_screen_close (GdkScreen *screen) { g_return_if_fail (GDK_IS_SCREEN (screen)); if (!screen->closed) { screen->closed = TRUE; g_object_run_dispose (G_OBJECT (screen)); } } /* Fallback used when the monitor "at" a point or window * doesn’t exist. */ static gint get_nearest_monitor (GdkScreen *screen, gint x, gint y) { gint num_monitors, i; gint nearest_dist = G_MAXINT; gint nearest_monitor = 0; g_return_val_if_fail (GDK_IS_SCREEN (screen), -1); num_monitors = gdk_screen_get_n_monitors (screen); for (i = 0; i < num_monitors; i++) { GdkRectangle monitor; gint dist_x, dist_y, dist; gdk_screen_get_monitor_geometry (screen, i, &monitor); if (x < monitor.x) dist_x = monitor.x - x; else if (x >= monitor.x + monitor.width) dist_x = x - (monitor.x + monitor.width) + 1; else dist_x = 0; if (y < monitor.y) dist_y = monitor.y - y; else if (y >= monitor.y + monitor.height) dist_y = y - (monitor.y + monitor.height) + 1; else dist_y = 0; dist = dist_x + dist_y; if (dist < nearest_dist) { nearest_dist = dist; nearest_monitor = i; } } return nearest_monitor; } /** * gdk_screen_get_monitor_at_point: * @screen: a #GdkScreen. * @x: the x coordinate in the virtual screen. * @y: the y coordinate in the virtual screen. * * Returns the monitor number in which the point (@x,@y) is located. * * Returns: the monitor number in which the point (@x,@y) lies, or * a monitor close to (@x,@y) if the point is not in any monitor. * * Since: 2.2 **/ gint gdk_screen_get_monitor_at_point (GdkScreen *screen, gint x, gint y) { gint num_monitors, i; g_return_val_if_fail (GDK_IS_SCREEN (screen), -1); num_monitors = gdk_screen_get_n_monitors (screen); for (i=0;i= monitor.x && x < monitor.x + monitor.width && y >= monitor.y && y < (monitor.y + monitor.height)) return i; } return get_nearest_monitor (screen, x, y); } /** * gdk_screen_get_monitor_at_window: * @screen: a #GdkScreen. * @window: a #GdkWindow * * Returns the number of the monitor in which the largest area of the * bounding rectangle of @window resides. * * Returns: the monitor number in which most of @window is located, * or if @window does not intersect any monitors, a monitor, * close to @window. * * Since: 2.2 **/ gint gdk_screen_get_monitor_at_window (GdkScreen *screen, GdkWindow *window) { gint num_monitors, i, area = 0, screen_num = -1; GdkRectangle win_rect; g_return_val_if_fail (GDK_IS_SCREEN (screen), -1); gdk_window_get_geometry (window, &win_rect.x, &win_rect.y, &win_rect.width, &win_rect.height); gdk_window_get_origin (window, &win_rect.x, &win_rect.y); num_monitors = gdk_screen_get_n_monitors (screen); for (i=0;i area) { area = intersect.width * intersect.height; screen_num = i; } } if (screen_num >= 0) return screen_num; else return get_nearest_monitor (screen, win_rect.x + win_rect.width / 2, win_rect.y + win_rect.height / 2); } /** * gdk_screen_width: * * Returns the width of the default screen in pixels. * * Returns: the width of the default screen in pixels. **/ gint gdk_screen_width (void) { return gdk_screen_get_width (gdk_screen_get_default ()); } /** * gdk_screen_height: * * Returns the height of the default screen in pixels. * * Returns: the height of the default screen in pixels. **/ gint gdk_screen_height (void) { return gdk_screen_get_height (gdk_screen_get_default ()); } /** * gdk_screen_width_mm: * * Returns the width of the default screen in millimeters. * Note that on many X servers this value will not be correct. * * Returns: the width of the default screen in millimeters, * though it is not always correct. **/ gint gdk_screen_width_mm (void) { return gdk_screen_get_width_mm (gdk_screen_get_default ()); } /** * gdk_screen_height_mm: * * Returns the height of the default screen in millimeters. * Note that on many X servers this value will not be correct. * * Returns: the height of the default screen in millimeters, * though it is not always correct. **/ gint gdk_screen_height_mm (void) { return gdk_screen_get_height_mm (gdk_screen_get_default ()); } /** * gdk_screen_set_font_options: * @screen: a #GdkScreen * @options: (allow-none): a #cairo_font_options_t, or %NULL to unset any * previously set default font 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 **/ void gdk_screen_set_font_options (GdkScreen *screen, const cairo_font_options_t *options) { g_return_if_fail (GDK_IS_SCREEN (screen)); if (screen->font_options != options) { if (screen->font_options) cairo_font_options_destroy (screen->font_options); if (options) screen->font_options = cairo_font_options_copy (options); else screen->font_options = NULL; g_object_notify (G_OBJECT (screen), "font-options"); } } /** * gdk_screen_get_font_options: * @screen: a #GdkScreen * * Gets any options previously set with gdk_screen_set_font_options(). * * Returns: (nullable): the current font options, or %NULL if no * default font options have been set. * * Since: 2.10 **/ const cairo_font_options_t * gdk_screen_get_font_options (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return screen->font_options; } /** * gdk_screen_set_resolution: * @screen: a #GdkScreen * @dpi: the resolution in “dots per inch”. (Physical inches aren’t actually * involved; the terminology is conventional.) * 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 **/ void gdk_screen_set_resolution (GdkScreen *screen, gdouble dpi) { g_return_if_fail (GDK_IS_SCREEN (screen)); if (dpi < 0) dpi = -1.0; if (screen->resolution != dpi) { screen->resolution = dpi; g_object_notify (G_OBJECT (screen), "resolution"); } } /** * gdk_screen_get_resolution: * @screen: a #GdkScreen * * Gets the resolution for font handling on the screen; see * gdk_screen_set_resolution() for full details. * * Returns: the current resolution, or -1 if no resolution * has been set. * * Since: 2.10 **/ gdouble gdk_screen_get_resolution (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), -1.0); return screen->resolution; } static void gdk_screen_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GdkScreen *screen = GDK_SCREEN (object); switch (prop_id) { case PROP_FONT_OPTIONS: g_value_set_pointer (value, (gpointer) gdk_screen_get_font_options (screen)); break; case PROP_RESOLUTION: g_value_set_double (value, gdk_screen_get_resolution (screen)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gdk_screen_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GdkScreen *screen = GDK_SCREEN (object); switch (prop_id) { case PROP_FONT_OPTIONS: gdk_screen_set_font_options (screen, g_value_get_pointer (value)); break; case PROP_RESOLUTION: gdk_screen_set_resolution (screen, g_value_get_double (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /** * gdk_screen_get_display: * @screen: a #GdkScreen * * Gets the display to which the @screen belongs. * * Returns: (transfer none): the display to which @screen belongs * * Since: 2.2 **/ GdkDisplay * gdk_screen_get_display (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_display (screen); } /** * gdk_screen_get_width: * @screen: a #GdkScreen * * Gets the width of @screen in pixels * * Returns: the width of @screen in pixels. * * Since: 2.2 **/ gint gdk_screen_get_width (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_width (screen); } /** * gdk_screen_get_height: * @screen: a #GdkScreen * * Gets the height of @screen in pixels * * Returns: the height of @screen in pixels. * * Since: 2.2 **/ gint gdk_screen_get_height (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_height (screen); } /** * gdk_screen_get_width_mm: * @screen: a #GdkScreen * * Gets the width of @screen in millimeters. * Note that on some X servers this value will not be correct. * * Returns: the width of @screen in millimeters. * * Since: 2.2 **/ gint gdk_screen_get_width_mm (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_width_mm (screen); } /** * gdk_screen_get_height_mm: * @screen: a #GdkScreen * * Returns the height of @screen in millimeters. * Note that on some X servers this value will not be correct. * * Returns: the heigth of @screen in millimeters. * * Since: 2.2 **/ gint gdk_screen_get_height_mm (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_height_mm (screen); } /** * gdk_screen_get_number: * @screen: a #GdkScreen * * Gets the index of @screen among the screens in the display * to which it belongs. (See gdk_screen_get_display()) * * Returns: the index * * Since: 2.2 **/ gint gdk_screen_get_number (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_number (screen); } /** * gdk_screen_get_root_window: * @screen: a #GdkScreen * * Gets the root window of @screen. * * Returns: (transfer none): the root window * * Since: 2.2 **/ GdkWindow * gdk_screen_get_root_window (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_root_window (screen); } /** * gdk_screen_get_n_monitors: * @screen: a #GdkScreen * * Returns the number of monitors which @screen consists of. * * Returns: number of monitors which @screen consists of * * Since: 2.2 */ gint gdk_screen_get_n_monitors (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_n_monitors (screen); } /** * gdk_screen_get_primary_monitor: * @screen: a #GdkScreen. * * 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. * * Returns: An integer index for the primary monitor, or 0 if none is configured. * * Since: 2.20 */ gint gdk_screen_get_primary_monitor (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), 0); return GDK_SCREEN_GET_CLASS (screen)->get_primary_monitor (screen); } /** * gdk_screen_get_monitor_width_mm: * @screen: a #GdkScreen * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen) * * Gets the width in millimeters of the specified monitor, if available. * * Returns: the width of the monitor, or -1 if not available * * Since: 2.14 */ gint gdk_screen_get_monitor_width_mm (GdkScreen *screen, gint monitor_num) { g_return_val_if_fail (GDK_IS_SCREEN (screen), -1); g_return_val_if_fail (monitor_num >= 0, -1); g_return_val_if_fail (monitor_num < gdk_screen_get_n_monitors (screen), -1); return GDK_SCREEN_GET_CLASS (screen)->get_monitor_width_mm (screen, monitor_num); } /** * gdk_screen_get_monitor_height_mm: * @screen: a #GdkScreen * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen) * * Gets the height in millimeters of the specified monitor. * * Returns: the height of the monitor, or -1 if not available * * Since: 2.14 */ gint gdk_screen_get_monitor_height_mm (GdkScreen *screen, gint monitor_num) { g_return_val_if_fail (GDK_IS_SCREEN (screen), -1); g_return_val_if_fail (monitor_num >= 0, -1); g_return_val_if_fail (monitor_num < gdk_screen_get_n_monitors (screen), -1); return GDK_SCREEN_GET_CLASS (screen)->get_monitor_height_mm (screen, monitor_num); } /** * gdk_screen_get_monitor_plug_name: * @screen: a #GdkScreen * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen) * * Returns the output name of the specified monitor. * Usually something like VGA, DVI, or TV, not the actual * product name of the display device. * * Returns: (nullable): a newly-allocated string containing the name * of the monitor, or %NULL if the name cannot be determined * * Since: 2.14 */ gchar * gdk_screen_get_monitor_plug_name (GdkScreen *screen, gint monitor_num) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); g_return_val_if_fail (monitor_num >= 0, NULL); g_return_val_if_fail (monitor_num < gdk_screen_get_n_monitors (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_monitor_plug_name (screen, monitor_num); } /** * gdk_screen_get_monitor_geometry: * @screen: a #GdkScreen * @monitor_num: the monitor number * @dest: (out) (allow-none): a #GdkRectangle to be filled with * the monitor geometry * * Retrieves the #GdkRectangle representing the size and position of * the individual monitor within the entire screen area. * * Monitor numbers start at 0. To obtain the number of monitors of * @screen, use gdk_screen_get_n_monitors(). * * 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 */ void gdk_screen_get_monitor_geometry (GdkScreen *screen, gint monitor_num, GdkRectangle *dest) { g_return_if_fail (GDK_IS_SCREEN (screen)); g_return_if_fail (monitor_num >= 0); g_return_if_fail (monitor_num < gdk_screen_get_n_monitors (screen)); GDK_SCREEN_GET_CLASS(screen)->get_monitor_geometry (screen, monitor_num, dest); } /** * gdk_screen_get_monitor_workarea: * @screen: a #GdkScreen * @monitor_num: the monitor number * @dest: (out) (allow-none): a #GdkRectangle to be filled with * the monitor workarea * * Retrieves the #GdkRectangle representing the size and position of * the “work area” on a monitor within the entire screen area. * * The work area should be considered when positioning menus and * similar popups, to avoid placing them below panels, docks or other * desktop components. * * Monitor numbers start at 0. To obtain the number of monitors of * @screen, use gdk_screen_get_n_monitors(). * * Since: 3.4 */ void gdk_screen_get_monitor_workarea (GdkScreen *screen, gint monitor_num, GdkRectangle *dest) { g_return_if_fail (GDK_IS_SCREEN (screen)); g_return_if_fail (monitor_num >= 0); g_return_if_fail (monitor_num < gdk_screen_get_n_monitors (screen)); GDK_SCREEN_GET_CLASS (screen)->get_monitor_workarea (screen, monitor_num, dest); } /** * gdk_screen_list_visuals: * @screen: the relevant #GdkScreen. * * 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. * * Returns: (transfer container) (element-type GdkVisual): * a list of visuals; the list must be freed, but not its contents * * Since: 2.2 **/ GList * gdk_screen_list_visuals (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->list_visuals (screen); } /** * gdk_screen_get_system_visual: * @screen: a #GdkScreen. * * 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. * * Returns: (transfer none): the system visual * * Since: 2.2 **/ GdkVisual * gdk_screen_get_system_visual (GdkScreen * screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_system_visual (screen); } /** * gdk_screen_get_rgba_visual: * @screen: a #GdkScreen * * Gets a visual to use for creating windows 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(). * * Returns: (nullable) (transfer none): a visual to use for windows * with an alpha channel or %NULL if the capability is not * available. * * Since: 2.8 **/ GdkVisual * gdk_screen_get_rgba_visual (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_rgba_visual (screen); } /** * gdk_screen_is_composited: * @screen: a #GdkScreen * * 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. * * Returns: Whether windows with RGBA visuals can reasonably be * expected to have their alpha channels drawn correctly on the screen. * * Since: 2.10 **/ gboolean gdk_screen_is_composited (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE); return GDK_SCREEN_GET_CLASS (screen)->is_composited (screen); } /** * gdk_screen_make_display_name: * @screen: a #GdkScreen * * Determines the name to pass to gdk_display_open() to get * a #GdkDisplay with this screen as the default screen. * * Returns: a newly allocated string, free with g_free() * * Since: 2.2 **/ gchar * gdk_screen_make_display_name (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->make_display_name (screen); } /** * gdk_screen_get_active_window: * @screen: a #GdkScreen * * 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](http://www.freedesktop.org/Standards/wm-spec). * 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. * * Returns: (nullable) (transfer full): the currently active window, * or %NULL. * * Since: 2.10 **/ GdkWindow * gdk_screen_get_active_window (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_active_window (screen); } /** * gdk_screen_get_window_stack: * @screen: a #GdkScreen * * 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](http://www.freedesktop.org/Standards/wm-spec). * 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. * * Returns: (nullable) (transfer full) (element-type GdkWindow): a * list of #GdkWindows for the current window stack, or %NULL. * * Since: 2.10 **/ GList * gdk_screen_get_window_stack (GdkScreen *screen) { g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL); return GDK_SCREEN_GET_CLASS (screen)->get_window_stack (screen); } /** * gdk_screen_get_setting: * @screen: the #GdkScreen where the setting is located * @name: the name of the setting * @value: location to store the value of the setting * * 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. * * Returns: %TRUE if the setting existed and a value was stored * in @value, %FALSE otherwise. * * Since: 2.2 **/ gboolean gdk_screen_get_setting (GdkScreen *screen, const gchar *name, GValue *value) { g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE); g_return_val_if_fail (name != NULL, FALSE); g_return_val_if_fail (value != NULL, FALSE); return GDK_SCREEN_GET_CLASS (screen)->get_setting (screen, name, value); } /** * gdk_screen_get_monitor_scale_factor: * @screen: screen to get scale factor for * @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen) * * Returns the internal scale factor that maps from monitor coordiantes * to the actual device pixels. On traditional systems this is 1, but * on very high density outputs this can be a higher value (often 2). * * This can be used if you want to create pixel based data for a * particula monitor, but most of the time you’re drawing to a window * where it is better to use gdk_window_get_scale_factor() instead. * * Since: 3.10 * Returns: the scale factor */ gint gdk_screen_get_monitor_scale_factor (GdkScreen *screen, gint monitor_num) { GdkScreenClass *screen_class; g_return_val_if_fail (GDK_IS_SCREEN (screen), 1); g_return_val_if_fail (monitor_num >= 0, 1); g_return_val_if_fail (monitor_num < gdk_screen_get_n_monitors (screen), 1); screen_class = GDK_SCREEN_GET_CLASS (screen); if (screen_class->get_monitor_scale_factor) return screen_class->get_monitor_scale_factor (screen, monitor_num); return 1; }