Struct gtk4::DragSource

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

DragSource is an event controller to initiate Drag-And-Drop operations.

DragSource can be set up with the necessary ingredients for a DND operation ahead of time. This includes the source for the data that is being transferred, in the form of a gdk::ContentProvider, the desired action, and the icon to use during the drag operation. After setting it up, the drag source must be added to a widget as an event controller, using WidgetExt::add_controller().

⚠️ The following code is in c ⚠️

static void
my_widget_init (MyWidget *self)
{
  GtkDragSource *drag_source = gtk_drag_source_new ();

  g_signal_connect (drag_source, "prepare", G_CALLBACK (on_drag_prepare), self);
  g_signal_connect (drag_source, "drag-begin", G_CALLBACK (on_drag_begin), self);

  gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (drag_source));
}

Setting up the content provider and icon ahead of time only makes sense when the data does not change. More commonly, you will want to set them up just in time. To do so, DragSource has signal::DragSource::prepare and signal::DragSource::drag-begin signals.

The ::prepare signal is emitted before a drag is started, and can be used to set the content provider and actions that the drag should be started with.

⚠️ The following code is in c ⚠️

static GdkContentProvider *
on_drag_prepare (GtkDragSource *source,
                 double         x,
                 double         y,
                 MyWidget      *self)
{
  // This widget supports two types of content: GFile objects
  // and GdkPixbuf objects; GTK will handle the serialization
  // of these types automatically
  GFile *file = my_widget_get_file (self);
  GdkPixbuf *pixbuf = my_widget_get_pixbuf (self);

  return gdk_content_provider_new_union ((GdkContentProvider *[2]) {
      gdk_content_provider_new_typed (G_TYPE_FILE, file),
      gdk_content_provider_new_typed (GDK_TYPE_PIXBUF, pixbuf),
    }, 2);
}

The ::drag-begin signal is emitted after the gdk::Drag object has been created, and can be used to set up the drag icon.

⚠️ The following code is in c ⚠️

static void
on_drag_begin (GtkDragSource *source,
               GdkDrag       *drag,
               MyWidget      *self)
{
  // Set the widget as the drag icon
  GdkPaintable *paintable = gtk_widget_paintable_new (GTK_WIDGET (self));
  gtk_drag_source_set_icon (source, paintable, 0, 0);
  g_object_unref (paintable);
}

During the DND operation, DragSource emits signals that can be used to obtain updates about the status of the operation, but it is not normally necessary to connect to any signals, except for one case: when the supported actions include gdk::DragAction::MOVE, you need to listen for the signal::DragSource::drag-end signal and delete the data after it has been transferred.

Implements

GestureSingleExt, GestureExt, EventControllerExt, glib::ObjectExt

Implementations§

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impl DragSource

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pub fn new() -> DragSource

Creates a new DragSource object.

Returns

the new DragSource

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pub fn builder() -> DragSourceBuilder

Creates a new builder-pattern struct instance to construct DragSource objects.

This method returns an instance of DragSourceBuilder which can be used to create DragSource objects.

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pub fn drag_cancel(&self)

Cancels a currently ongoing drag operation.

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pub fn actions(&self) -> DragAction

Gets the actions that are currently set on the DragSource.

Returns

the actions set on @self

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pub fn content(&self) -> Option<ContentProvider>

Gets the current content provider of a DragSource.

Returns

the gdk::ContentProvider of @self

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pub fn drag(&self) -> Option<Drag>

Returns the underlying gdk::Drag object for an ongoing drag.

Returns

the gdk::Drag of the current drag operation

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pub fn set_actions(&self, actions: DragAction)

Sets the actions on the DragSource.

During a DND operation, the actions are offered to potential drop targets. If @actions include gdk::DragAction::MOVE, you need to listen to the signal::DragSource::drag-end signal and handle @delete_data being true.

This function can be called before a drag is started, or in a handler for the signal::DragSource::prepare signal.

actions

the actions to offer

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pub fn set_content(&self, content: Option<&impl IsA<ContentProvider>>)

Sets a content provider on a DragSource.

When the data is requested in the cause of a DND operation, it will be obtained from the content provider.

This function can be called before a drag is started, or in a handler for the signal::DragSource::prepare signal.

You may consider setting the content provider back to None in a signal::DragSource::drag-end signal handler.

content

a gdk::ContentProvider

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pub fn set_icon( &self, paintable: Option<&impl IsA<Paintable>>, hot_x: i32, hot_y: i32 )

Sets a paintable to use as icon during DND operations.

The hotspot coordinates determine the point on the icon that gets aligned with the hotspot of the cursor.

If @paintable is None, a default icon is used.

This function can be called before a drag is started, or in a signal::DragSource::prepare or signal::DragSource::drag-begin signal handler.

paintable

the gdk::Paintable to use as icon

hot_x

the hotspot X coordinate on the icon

hot_y

the hotspot Y coordinate on the icon

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pub fn connect_drag_begin<F: Fn(&Self, &Drag) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted on the drag source when a drag is started.

It can be used to e.g. set a custom drag icon with set_icon().

drag

the gdk::Drag object

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pub fn connect_drag_cancel<F: Fn(&Self, &Drag, DragCancelReason) -> bool + 'static>( &self, f: F ) -> SignalHandlerId

Emitted on the drag source when a drag has failed.

The signal handler may handle a failed drag operation based on the type of error. It should return true if the failure has been handled and the default “drag operation failed” animation should not be shown.

drag

the gdk::Drag object

reason

information on why the drag failed

Returns

true if the failed drag operation has been already handled

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pub fn connect_drag_end<F: Fn(&Self, &Drag, bool) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted on the drag source when a drag is finished.

A typical reason to connect to this signal is to undo things done in signal::DragSource::prepare or signal::DragSource::drag-begin handlers.

drag

the gdk::Drag object

delete_data

true if the drag was performing gdk::DragAction::MOVE, and the data should be deleted

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pub fn connect_prepare<F: Fn(&Self, f64, f64) -> Option<ContentProvider> + 'static>( &self, f: F ) -> SignalHandlerId

Emitted when a drag is about to be initiated.

It returns the gdk::ContentProvider to use for the drag that is about to start. The default handler for this signal returns the value of the property::DragSource::content property, so if you set up that property ahead of time, you don’t need to connect to this signal.

x

the X coordinate of the drag starting point

y

the Y coordinate fo the drag starting point

Returns

a gdk::ContentProvider

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pub fn connect_actions_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId

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pub fn connect_content_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId

Trait Implementations§

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impl Clone for DragSource

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for DragSource

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for DragSource

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Display for DragSource

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Hash for DragSource

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fn hash<H>(&self, state: &mut H)where H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for DragSource

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fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl ParentClassIs for DragSource

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impl<OT: ObjectType> PartialEq<OT> for DragSource

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fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<OT: ObjectType> PartialOrd<OT> for DragSource

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fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl StaticType for DragSource

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for DragSource

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impl IsA<EventController> for DragSource

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impl IsA<Gesture> for DragSource

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impl IsA<GestureSingle> for DragSource

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Connect to the signal signal_name on this object. Read more
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unsafe fn try_connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> Result<SignalHandlerId, BoolError>where F: Fn(&[Value]) -> Option<Value>,

Similar to Self::connect_unsafe_id but fails instead of panicking.
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fn try_connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure ) -> Result<SignalHandlerId, BoolError>

Similar to Self::connect_closure but fails instead of panicking.
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fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure ) -> SignalHandlerId

Connect a closure to the signal signal_name on this object. Read more
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fn try_connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> Result<SignalHandlerId, BoolError>

Similar to Self::connect_closure_id but fails instead of panicking.
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fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> SignalHandlerId

Connect a closure to the signal signal_id on this object. Read more
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fn watch_closure(&self, closure: &impl AsRef<Closure>)

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 Closure::invoke.
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unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value>,

Connect to the signal signal_id on this object. Read more
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fn try_emit<R>( &self, signal_id: SignalId, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,

Similar to Self::emit but fails instead of panicking.
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fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by signal id. Read more
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fn try_emit_with_values( &self, signal_id: SignalId, args: &[Value] ) -> Result<Option<Value>, BoolError>

Similar to Self::emit_with_values but fails instead of panicking.
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fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>

Same as Self::emit but takes Value for the arguments.
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fn try_emit_by_name<R>( &self, signal_name: &str, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,

Similar to Self::emit_by_name but fails instead of panicking.
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fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by its name. Read more
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fn try_emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Result<Option<Value>, BoolError>

Similar to Self::emit_by_name_with_values but fails instead of panicking.
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fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Option<Value>

Emit signal by its name. Read more
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fn try_emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,

Similar to Self::emit_by_name_with_details but fails instead of panicking.
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fn emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by its name with details. Read more
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fn try_emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Result<Option<Value>, BoolError>

Similar to Self::emit_by_name_with_details_and_values but fails instead of panicking.
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fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by its name with details. Read more
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fn try_emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Result<R, BoolError>where R: TryFromClosureReturnValue,

Similar to Self::emit_with_details but fails instead of panicking.
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fn emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,

Emit signal by signal id with details. Read more
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fn try_emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Result<Option<Value>, BoolError>

Similar to Self::emit_with_details_and_values but fails instead of panicking.
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fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by signal id with details. Read more
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fn disconnect(&self, handler_id: SignalHandlerId)

Disconnect a previously connected signal handler.
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fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,

Connect to the notify signal of the object. Read more
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fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,

Connect to the notify signal of the object. Read more
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unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),

Connect to the notify signal of the object. Read more
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fn notify(&self, property_name: &str)

Notify that the given property has changed its value. Read more
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fn notify_by_pspec(&self, pspec: &ParamSpec)

Notify that the given property has changed its value. Read more
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fn downgrade(&self) -> WeakRef<T>

Downgrade this object to a weak reference.
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fn bind_property<O, 'a>( &'a self, source_property: &'a str, target: &'a O, target_property: &'a str ) -> BindingBuilder<'a>where O: ObjectType,

Bind property source_property on this object to the target_property on the target object. Read more
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fn ref_count(&self) -> u32

Returns the strong reference count of this object.
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impl<T> StaticTypeExt for Twhere T: StaticType,

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fn ensure_type()

Ensures that the type has been registered with the type system.
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impl<T> ToClosureReturnValue for Twhere T: ToValue,

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T> TryFromClosureReturnValue for Twhere T: for<'a> FromValue<'a> + StaticType + 'static,

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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Super, Sub> CanDowncast<Sub> for Superwhere Super: IsA<Super>, Sub: IsA<Super>,

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impl<'a, T, C> FromValueOptional<'a> for Twhere T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError>,