Struct glib::SignalGroup

source ·
#[repr(transparent)]
pub struct SignalGroup { /* private fields */ }
Available on crate feature v2_74 only.
Expand description

SignalGroup manages to simplify the process of connecting many signals to a Object as a group. As such there is no API to disconnect a signal from the group.

In particular, this allows you to:

  • Change the target instance, which automatically causes disconnection of the signals from the old instance and connecting to the new instance.
  • Block and unblock signals as a group
  • Ensuring that blocked state transfers across target instances.

One place you might want to use such a structure is with GtkTextView and GtkTextBuffer. Often times, you’ll need to connect to many signals on GtkTextBuffer from a GtkTextView subclass. This allows you to create a signal group during instance construction, simply bind the GtkTextView:buffer property to property::SignalGroup::target and connect all the signals you need. When the GtkTextView:buffer property changes all of the signals will be transitioned correctly.

Implements

ObjectExt

Implementations§

Creates a new SignalGroup for target instances of target_type.

target_type

the GType of the target instance.

Returns

a new SignalGroup

Blocks all signal handlers managed by self so they will not be called during any signal emissions. Must be unblocked exactly the same number of times it has been blocked to become active again.

This blocked state will be kept across changes of the target instance.

Gets the target instance used when connecting signals.

Returns

The target instance

Sets the target instance used when connecting signals. Any signal that has been registered with g_signal_group_connect_object() or similar functions will be connected to this object.

If the target instance was previously set, signals will be disconnected from that object prior to connecting to target.

target

The target instance used when connecting signals.

Unblocks all signal handlers managed by self so they will be called again during any signal emissions unless it is blocked again. Must be unblocked exactly the same number of times it has been blocked to become active again.

Available on crate feature v2_72 only.

The GType of the target property.

Connects closure to the signal detailed_signal on property::SignalGroup::target.

You cannot connect a signal handler after property::SignalGroup::target has been set.

detailed_signal

a string of the form signal-name with optional ::signal-detail

closure

the closure to connect.

after

whether the handler should be called before or after the default handler of the signal.

Connects c_handler to the signal detailed_signal on the target instance of self.

You cannot connect a signal handler after property::SignalGroup::target has been set.

detailed_signal

a string of the form “signal-name::detail”

c_handler

the GCallback to connect

Like Self::connect but doesn’t require a Send+Sync closure. Signal emission will panic if the signal on the current target is emitted from a different thread from the thread that connected the signal.

This signal is emitted when property::SignalGroup::target is set to a new value other than None. It is similar to signal::Object::notify on target except it will not emit when property::SignalGroup::target is None and also allows for receiving the Object without a data-race.

instance

a Object containing the new value for property::SignalGroup::target

Like Self::connect_bind but doesn’t require a Send+Sync closure. Signal emission will panic if the signal is emitted from a different thread from the thread that connected the signal.

This signal is emitted when the target instance of self_ is set to a new Object.

This signal will only be emitted if the previous target of self_ is non-None.

Like Self::connect_unbind but doesn’t require a Send+Sync closure. Signal emission will panic if the signal is emitted from a different thread from the thread that connected the signal.

Trait Implementations§

Returns a copy of the value. Read more
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Formats the value using the given formatter. Read more
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This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
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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
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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
Sets the property property_name of the object to value value. Read more
Sets multiple properties of the object at once. Read more
Sets multiple properties of the object at once. Read more
Gets the property property_name of the object and cast it to the type V. Read more
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Check if the object has a property property_name of the given type_. Read more
Get the type of the property property_name of this object. Read more
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Return all ParamSpec of the properties of this object.
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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Set arbitrary data on this object with the given key. Read more
Return previously set arbitrary data of this object with the given key. Read more
Retrieve previously set arbitrary data of this object with the given key. Read more
Block a given signal handler. Read more
Unblock a given signal handler.
Stop emission of the currently emitted signal.
Stop emission of the currently emitted signal by the (possibly detailed) signal name.
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect to the signal signal_name on this object. Read more
Connect to the signal signal_id on this object. Read more
Connect a closure to the signal signal_name on this object. Read more
Connect a closure to the signal signal_id on this object. Read more
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
Emit signal by its name. Read more
Emit signal by its name with details. Read more
Emit signal by its name with details. Read more
Emit signal by signal id with details. Read more
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
Connect to the notify signal of the object. Read more
Connect to the notify signal of the object. Read more
Notify that the given property has changed its value. Read more
Notify that the given property has changed its value. Read more
Downgrade this object to a weak reference.
Add a callback to be notified when the Object is disposed.
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