Struct gtk4::Editable

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

Editable is an interface for text editing widgets.

Typical examples of editable widgets are Entry and SpinButton. It contains functions for generically manipulating an editable widget, a large number of action signals used for key bindings, and several signals that an application can connect to modify the behavior of a widget.

As an example of the latter usage, by connecting the following handler to signal::Editable::insert-text, an application can convert all entry into a widget into uppercase.

Forcing entry to uppercase.

⚠️ The following code is in c ⚠️

#include <ctype.h>

void
insert_text_handler (GtkEditable *editable,
                     const char  *text,
                     int          length,
                     int         *position,
                     gpointer     data)
{
  char *result = g_utf8_strup (text, length);

  g_signal_handlers_block_by_func (editable,
                               (gpointer) insert_text_handler, data);
  gtk_editable_insert_text (editable, result, length, position);
  g_signal_handlers_unblock_by_func (editable,
                                     (gpointer) insert_text_handler, data);

  g_signal_stop_emission_by_name (editable, "insert_text");

  g_free (result);
}

Implementing GtkEditable

The most likely scenario for implementing Editable on your own widget is that you will embed a Text inside a complex widget, and want to delegate the editable functionality to that text widget. Editable provides some utility functions to make this easy.

In your class_init function, call [install_properties()][Self::install_properties()], passing the first available property ID:

⚠️ The following code is in c ⚠️

static void
my_class_init (MyClass *class)
{
  ...
  g_object_class_install_properties (object_class, NUM_PROPERTIES, props);
  gtk_editable_install_properties (object_clas, NUM_PROPERTIES);
  ...
}

In your interface_init function for the Editable interface, provide an implementation for the get_delegate vfunc that returns your text widget:

⚠️ The following code is in c ⚠️

GtkEditable *
get_editable_delegate (GtkEditable *editable)
{
  return GTK_EDITABLE (MY_WIDGET (editable)->text_widget);
}

static void
my_editable_init (GtkEditableInterface *iface)
{
  iface->get_delegate = get_editable_delegate;
}

You don’t need to provide any other vfuncs. The default implementations work by forwarding to the delegate that the GtkEditableInterface.get_delegate() vfunc returns.

In your instance_init function, create your text widget, and then call EditableExt::init_delegate():

⚠️ The following code is in c ⚠️

static void
my_widget_init (MyWidget *self)
{
  ...
  self->text_widget = gtk_text_new ();
  gtk_editable_init_delegate (GTK_EDITABLE (self));
  ...
}

In your dispose function, call EditableExt::finish_delegate() before destroying your text widget:

⚠️ The following code is in c ⚠️

static void
my_widget_dispose (GObject *object)
{
  ...
  gtk_editable_finish_delegate (GTK_EDITABLE (self));
  g_clear_pointer (&self->text_widget, gtk_widget_unparent);
  ...
}

Finally, use [delegate_set_property()][Self::delegate_set_property()] in your set_property function (and similar for get_property), to set the editable properties:

⚠️ The following code is in c ⚠️

  ...
  if (gtk_editable_delegate_set_property (object, prop_id, value, pspec))
    return;

  switch (prop_id)
  ...

It is important to note that if you create a Editable that uses a delegate, the low level signal::Editable::insert-text and signal::Editable::delete-text signals will be propagated from the “wrapper” editable to the delegate, but they will not be propagated from the delegate to the “wrapper” editable, as they would cause an infinite recursion. If you wish to connect to the signal::Editable::insert-text and signal::Editable::delete-text signals, you will need to connect to them on the delegate obtained via EditableExt::delegate().

Implements

EditableExt, WidgetExt, glib::ObjectExt, AccessibleExt, BuildableExt, ConstraintTargetExt, EditableExtManual, WidgetExtManual, AccessibleExtManual

Implementations§

Trait Implementations§

Returns a copy of the value. Read more
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Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
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Feeds a slice of this type into the given Hasher. Read more
Override the virtual methods of this interface for the given subclass and do other interface initialization. Read more
Instance specific initialization. Read more
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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Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==.
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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.
source§

impl IsA<Editable> for Entry

Auto Trait Implementations§

Blanket Implementations§

Updates an array of accessible properties. Read more
Updates an array of accessible relations. Read more
Updates an array of accessible states. Read more
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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Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
Casts to T unconditionally. Read more
Casts to &T unconditionally. Read more

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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Returns the interface T of the object. Read more
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
Gets the property property_name of the object. Read more
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
Get the ParamSpec of the property property_name of this object.
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
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
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
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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.
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
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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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Runs the dispose mechanism of the object. Read more
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The resulting type after obtaining ownership.
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