#[repr(transparent)]pub struct Geometry { /* private fields */ }
Expand description
The Geometry
struct gives the window manager information about
a window’s geometry constraints. Normally you would set these on
the GTK+ level using gtk_window_set_geometry_hints()
. GtkWindow
then sets the hints on the Window
it creates.
Window::set_geometry_hints()
expects the hints to be fully valid already
and simply passes them to the window manager; in contrast,
gtk_window_set_geometry_hints()
performs some interpretation. For example,
GtkWindow
will apply the hints to the geometry widget instead of the
toplevel window, if you set a geometry widget. Also, the
min_width
/min_height
/max_width
/max_height
fields may be set to -1, and
GtkWindow
will substitute the size request of the window or geometry widget.
If the minimum size hint is not provided, GtkWindow
will use its requisition
as the minimum size. If the minimum size is provided and a geometry widget is
set, GtkWindow
will take the minimum size as the minimum size of the
geometry widget rather than the entire window. The base size is treated
similarly.
The canonical use-case for gtk_window_set_geometry_hints()
is to get a
terminal widget to resize properly. Here, the terminal text area should be
the geometry widget; GtkWindow
will then automatically set the base size to
the size of other widgets in the terminal window, such as the menubar and
scrollbar. Then, the width_inc
and height_inc
fields should be set to the
size of one character in the terminal. Finally, the base size should be set
to the size of one character. The net effect is that the minimum size of the
terminal will have a 1x1 character terminal area, and only terminal sizes on
the “character grid” will be allowed.
Here’s an example of how the terminal example would be implemented, assuming a terminal area widget called “terminal” and a toplevel window “toplevel”:
⚠️ The following code is in C ⚠️
GdkGeometry hints;
hints.base_width = terminal->char_width;
hints.base_height = terminal->char_height;
hints.min_width = terminal->char_width;
hints.min_height = terminal->char_height;
hints.width_inc = terminal->char_width;
hints.height_inc = terminal->char_height;
gtk_window_set_geometry_hints (GTK_WINDOW (toplevel),
GTK_WIDGET (terminal),
&hints,
GDK_HINT_RESIZE_INC |
GDK_HINT_MIN_SIZE |
GDK_HINT_BASE_SIZE);
The other useful fields are the min_aspect
and max_aspect
fields; these
contain a width/height ratio as a floating point number. If a geometry widget
is set, the aspect applies to the geometry widget rather than the entire
window. The most common use of these hints is probably to set min_aspect
and
max_aspect
to the same value, thus forcing the window to keep a constant
aspect ratio.
Implementations
sourceimpl Geometry
impl Geometry
pub fn new(
min_width: i32,
min_height: i32,
max_width: i32,
max_height: i32,
base_width: i32,
base_height: i32,
width_inc: i32,
height_inc: i32,
min_aspect: f64,
max_aspect: f64,
win_gravity: Gravity
) -> Self
pub fn min_width(&self) -> i32
pub fn min_height(&self) -> i32
pub fn max_width(&self) -> i32
pub fn max_height(&self) -> i32
pub fn base_width(&self) -> i32
pub fn base_height(&self) -> i32
pub fn width_inc(&self) -> i32
pub fn height_inc(&self) -> i32
pub fn min_aspect(&self) -> f64
pub fn max_aspect(&self) -> f64
pub fn win_gravity(&self) -> Gravity
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for Geometry
impl Send for Geometry
impl Sync for Geometry
impl Unpin for Geometry
impl UnwindSafe for Geometry
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more