#[repr(transparent)]pub struct IMContext { /* private fields */ }
Expand description
IMContext
defines the interface for GTK input methods.
IMContext
is used by GTK text input widgets like Text
to map from key events to Unicode character strings.
An input method may consume multiple key events in sequence before finally
outputting the composed result. This is called preediting, and an input
method may provide feedback about this process by displaying the intermediate
composition states as preedit text. To do so, the IMContext
will emit
preedit-start
, preedit-changed
and preedit-end
signals.
For instance, the built-in GTK input method IMContextSimple
implements the input of arbitrary Unicode code points by holding down the
Control and Shift keys and then typing u
followed by the hexadecimal digits of the code point. When releasing the
Control and Shift keys, preediting ends and the
character is inserted as text. For example,
Ctrl+Shift+u 2 0 A C
results in the € sign.
Additional input methods can be made available for use by GTK widgets as
loadable modules. An input method module is a small shared library which
provides a GIOExtension
for the extension point named “gtk-im-module”.
To connect a widget to the users preferred input method, you should use
IMMulticontext
.
This is an Abstract Base Class, you cannot instantiate it.
Properties
input-hints
Additional hints that allow input methods to fine-tune their behaviour.
Readable | Writeable
input-purpose
The purpose of the text field that the `GtkIMContext is connected to.
This property can be used by on-screen keyboards and other input methods to adjust their behaviour.
Readable | Writeable
Signals
commit
The ::commit signal is emitted when a complete input sequence has been entered by the user.
If the commit comes after a preediting sequence, the ::commit signal is emitted after ::preedit-end.
This can be a single character immediately after a key press or the final result of preediting.
delete-surrounding
The ::delete-surrounding signal is emitted when the input method needs to delete all or part of the context surrounding the cursor.
preedit-changed
The ::preedit-changed signal is emitted whenever the preedit sequence currently being entered has changed.
It is also emitted at the end of a preedit sequence, in which case
IMContextExt::preedit_string()
returns the empty string.
preedit-end
The ::preedit-end signal is emitted when a preediting sequence has been completed or canceled.
preedit-start
The ::preedit-start signal is emitted when a new preediting sequence starts.
retrieve-surrounding
The ::retrieve-surrounding signal is emitted when the input method requires the context surrounding the cursor.
The callback should set the input method surrounding context by
calling the IMContextExt::set_surrounding()
method.
Implements
Implementations§
Trait Implementations§
source§impl HasParamSpec for IMContext
impl HasParamSpec for IMContext
source§impl<T: IMContextImpl> IsSubclassable<T> for IMContext
impl<T: IMContextImpl> IsSubclassable<T> for IMContext
source§fn class_init(class: &mut Class<Self>)
fn class_init(class: &mut Class<Self>)
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
source§impl Ord for IMContext
impl Ord for IMContext
source§impl<OT: ObjectType> PartialEq<OT> for IMContext
impl<OT: ObjectType> PartialEq<OT> for IMContext
source§impl<OT: ObjectType> PartialOrd<OT> for IMContext
impl<OT: ObjectType> PartialOrd<OT> for IMContext
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for IMContext
impl StaticType for IMContext
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for IMContext
impl IsA<IMContext> for IMContextSimple
impl IsA<IMContext> for IMMulticontext
Auto Trait Implementations§
impl RefUnwindSafe for IMContext
impl !Send for IMContext
impl !Sync for IMContext
impl Unpin for IMContext
impl UnwindSafe for IMContext
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