GI.Gtk.Objects.Fixed

The Fixed widget is a container which can place child widgets at fixed positions and with fixed sizes, given in pixels. Fixed performs no automatic layout management.

For most applications, you should not use this container! It keeps you from having to learn about the other GTK+ containers, but it results in broken applications. With Fixed, the following things will result in truncated text, overlapping widgets, and other display bugs:

• Themes, which may change widget sizes.
• Fonts other than the one you used to write the app will of course change the size of widgets containing text; keep in mind that users may use a larger font because of difficulty reading the default, or they may be using a different OS that provides different fonts.
• Translation of text into other languages changes its size. Also, display of non-English text will use a different font in many cases.

In addition, Fixed does not pay attention to text direction and thus may produce unwanted results if your app is run under right-to-left languages such as Hebrew or Arabic. That is: normally GTK+ will order containers appropriately for the text direction, e.g. to put labels to the right of the thing they label when using an RTL language, but it can’t do that with Fixed. So if you need to reorder widgets depending on the text direction, you would need to manually detect it and adjust child positions accordingly.

Finally, fixed positioning makes it kind of annoying to add/remove GUI elements, since you have to reposition all the other elements. This is a long-term maintenance problem for your application.

If you know none of these things are an issue for your application, and prefer the simplicity of Fixed, by all means use the widget. But you should be aware of the tradeoffs.

See also Layout, which shares the ability to perform fixed positioning of child widgets and additionally adds custom drawing and scrollability.

Exported types

newtype Fixed

Memory-managed wrapper type.

Constructors

Fixed (ManagedPtr Fixed)

Instances

GObject Fixed

Defined in GI.Gtk.Objects.Fixed

Methods

gobjectType :: Fixed -> IO GType

IsImplementorIface Fixed

Defined in GI.Gtk.Objects.Fixed

IsObject Fixed

Defined in GI.Gtk.Objects.Fixed

IsBuildable Fixed

Defined in GI.Gtk.Objects.Fixed

IsContainer Fixed

Defined in GI.Gtk.Objects.Fixed

IsWidget Fixed

Defined in GI.Gtk.Objects.Fixed

IsFixed Fixed

Defined in GI.Gtk.Objects.Fixed

class GObject o => IsFixed o

Type class for types which can be safely cast to Fixed, for instance with toFixed.

Instances

(GObject a, (UnknownAncestorError Fixed a :: Constraint)) => IsFixed a

Defined in GI.Gtk.Objects.Fixed

IsFixed Fixed

Defined in GI.Gtk.Objects.Fixed

toFixed :: (MonadIO m, IsFixed o) => o -> m Fixed

Cast to Fixed, for types for which this is known to be safe. For general casts, use castTo.

noFixed :: Maybe Fixed

A convenience alias for Nothing :: Maybe Fixed.

Methods

move

fixedMove

Arguments

:: (HasCallStack, MonadIO m, IsFixed a, IsWidget b)

=> a

fixed: a Fixed.

-> b

widget: the child widget.

-> Int32

x: the horizontal position to move the widget to.

-> Int32

y: the vertical position to move the widget to.

-> m ()

Moves a child of a Fixed container to the given position.

new

fixedNew

Arguments

:: (HasCallStack, MonadIO m)

=> m Fixed

Returns: a new Fixed.

Creates a new Fixed.

put

fixedPut

Arguments

:: (HasCallStack, MonadIO m, IsFixed a, IsWidget b)

=> a

fixed: a Fixed.

-> b

widget: the widget to add.

-> Int32

x: the horizontal position to place the widget at.

-> Int32

y: the vertical position to place the widget at.

-> m ()

Adds a widget to a Fixed container at the given position.