#[repr(transparent)]
pub struct Screen { /* private fields */ }
Expand description

Screen 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 Screen 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 (system_visual()), the dimensions of the physical monitors (gdk_screen_get_monitor_geometry()), etc.

Implementations

Gets the display to which the self belongs.

Returns

the display to which self belongs

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

Returns

the current resolution, or -1 if no resolution has been set.

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 None will be returned. Even if a non-None 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 Window::set_opacity().

Returns

a visual to use for windows with an alpha channel or None if the capability is not available.

Gets the root window of self.

Returns

the root window

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

Returns

the system visual

Obtains a list of all toplevel windows known to GDK on the screen self. 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.

Returns

list of toplevel windows, free with g_list_free()

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 None.

On other platforms, this function may return None, 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

a list of GdkWindows for the current window stack, or None.

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 self.

Returns

Whether windows with RGBA visuals can reasonably be expected to have their alpha channels drawn correctly on the screen.

Lists the available visuals for the specified self. 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

a list of visuals; the list must be freed, but not its contents

Sets the default font options for the screen. These options will be set on any pango::Context’s newly created with pango_context_get_for_screen(). Changing the default set of font options does not affect contexts that have already been created.

options

a cairo::FontOptions, or None to unset any previously set default font options.

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).

dpi

the resolution in “dots per inch”. (Physical inches aren’t actually involved; the terminology is conventional.)

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

Returns

a Screen, or None if there is no default display.

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

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.

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

Gets any options previously set with set_font_options().

Returns

the current font options, or None if no default font options have been set.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
Returns the type identifier of Self.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
Upcasts an object to a superclass or interface T. Read more
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Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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Sets the property property_name of the object to value value. Read more
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Freeze all property notifications until the return guard object is dropped. Read more
Set arbitrary data on this object with the given key. Read more
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Retrieve previously set arbitrary data of this object with the given key. Read more
Set arbitrary data on this object with the given key. Read more
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Retrieve previously set arbitrary data of this object with the given key. Read more
Block a given signal handler. Read more
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Stop emission of the currently emitted signal.
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Connect to the signal signal_name on this object. Read more
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Connect a closure to the signal signal_name on this object. Read more
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Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures. Read more
Emit signal by signal id. Read more
Same as Self::emit but takes Value for the arguments.
Emit signal by its name. Read more
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Emit signal by signal id with details. Read more
Disconnect a previously connected signal handler.
Connect to the notify signal of the object. Read more
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