Struct gtk4::DropTargetAsync

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

DropTargetAsync is an event controller to receive Drag-and-Drop operations, asynchronously.

It is the more complete but also more complex method of handling drop operations compared to DropTarget, and you should only use it if DropTarget doesn’t provide all the features you need.

To use a DropTargetAsync to receive drops on a widget, you create a DropTargetAsync object, configure which data formats and actions you support, connect to its signals, and then attach it to the widget with WidgetExt::add_controller().

During a drag operation, the first signal that a DropTargetAsync emits is accept, which is meant to determine whether the target is a possible drop site for the ongoing drop. The default handler for the ::accept signal accepts the drop if it finds a compatible data format and an action that is supported on both sides.

If it is, and the widget becomes a target, you will receive a drag-enter signal, followed by drag-motion signals as the pointer moves, optionally a drop signal when a drop happens, and finally a drag-leave signal when the pointer moves off the widget.

The ::drag-enter and ::drag-motion handler return a gdk::DragAction to update the status of the ongoing operation. The ::drop handler should decide if it ultimately accepts the drop and if it does, it should initiate the data transfer and finish the operation by calling Drop::finish().

Between the ::drag-enter and ::drag-leave signals the widget is a current drop target, and will receive the StateFlags::DROP_ACTIVE state, which can be used by themes to style the widget as a drop target.

Properties

actions

The GdkDragActions that this drop target supports.

Readable | Writeable

formats

The gdk::ContentFormats that determines the supported data formats.

Readable | Writeable

EventController

name

The name for this controller, typically used for debugging purposes.

Readable | Writeable

propagation-limit

The limit for which events this controller will handle.

Readable | Writeable

propagation-phase

The propagation phase at which this controller will handle events.

Readable | Writeable

widget

The widget receiving the GdkEvents that the controller will handle.

Readable

Signals

accept

Emitted on the drop site when a drop operation is about to begin.

If the drop is not accepted, false will be returned and the drop target will ignore the drop. If true is returned, the drop is accepted for now but may be rejected later via a call to DropTargetAsync::reject_drop() or ultimately by returning false from a drop handler.

The default handler for this signal decides whether to accept the drop based on the formats provided by the @drop.

If the decision whether the drop will be accepted or rejected needs further processing, such as inspecting the data, this function should return true and proceed as is @drop was accepted and if it decides to reject the drop later, it should call DropTargetAsync::reject_drop().

drag-enter

Emitted on the drop site when the pointer enters the widget.

It can be used to set up custom highlighting.

drag-leave

Emitted on the drop site when the pointer leaves the widget.

Its main purpose it to undo things done in DropTargetAsync::drag-enter.

drag-motion

Emitted while the pointer is moving over the drop target.

drop

Emitted on the drop site when the user drops the data onto the widget.

The signal handler must determine whether the pointer position is in a drop zone or not. If it is not in a drop zone, it returns false and no further processing is necessary.

Otherwise, the handler returns true. In this case, this handler will accept the drop. The handler must ensure that Drop::finish() is called to let the source know that the drop is done. The call to Drop::finish() must only be done when all data has been received.

To receive the data, use one of the read functions provided by gdk::Drop such as Drop::read_async() or Drop::read_value_async().

Implements

EventControllerExt, glib::ObjectExt

Implementations§

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impl DropTargetAsync

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pub fn new( formats: Option<ContentFormats>, actions: DragAction ) -> DropTargetAsync

Creates a new DropTargetAsync object.

formats

the supported data formats

actions

the supported actions

Returns

the new DropTargetAsync

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pub fn builder() -> DropTargetAsyncBuilder

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

This method returns an instance of DropTargetAsyncBuilder which can be used to create DropTargetAsync objects.

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pub fn actions(&self) -> DragAction

Gets the actions that this drop target supports.

Returns

the actions that this drop target supports

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pub fn formats(&self) -> Option<ContentFormats>

Gets the data formats that this drop target accepts.

If the result is None, all formats are expected to be supported.

Returns

the supported data formats

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pub fn reject_drop(&self, drop: &Drop)

Sets the @drop as not accepted on this drag site.

This function should be used when delaying the decision on whether to accept a drag or not until after reading the data.

drop

the gdk::Drop of an ongoing drag operation

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pub fn set_actions(&self, actions: DragAction)

Sets the actions that this drop target supports.

actions

the supported actions

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pub fn set_formats(&self, formats: Option<&ContentFormats>)

Sets the data formats that this drop target will accept.

formats

the supported data formats or None for any format

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

Emitted on the drop site when a drop operation is about to begin.

If the drop is not accepted, false will be returned and the drop target will ignore the drop. If true is returned, the drop is accepted for now but may be rejected later via a call to reject_drop() or ultimately by returning false from a drop handler.

The default handler for this signal decides whether to accept the drop based on the formats provided by the @drop.

If the decision whether the drop will be accepted or rejected needs further processing, such as inspecting the data, this function should return true and proceed as is @drop was accepted and if it decides to reject the drop later, it should call reject_drop().

drop

the gdk::Drop

Returns

true if @drop is accepted

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pub fn connect_drag_enter<F: Fn(&Self, &Drop, f64, f64) -> DragAction + 'static>( &self, f: F ) -> SignalHandlerId

Emitted on the drop site when the pointer enters the widget.

It can be used to set up custom highlighting.

drop

the gdk::Drop

x

the x coordinate of the current pointer position

y

the y coordinate of the current pointer position

Returns

Preferred action for this drag operation.

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

Emitted on the drop site when the pointer leaves the widget.

Its main purpose it to undo things done in DropTargetAsync::drag-enter.

drop

the gdk::Drop

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pub fn connect_drag_motion<F: Fn(&Self, &Drop, f64, f64) -> DragAction + 'static>( &self, f: F ) -> SignalHandlerId

Emitted while the pointer is moving over the drop target.

drop

the gdk::Drop

x

the x coordinate of the current pointer position

y

the y coordinate of the current pointer position

Returns

Preferred action for this drag operation.

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pub fn connect_drop<F: Fn(&Self, &Drop, f64, f64) -> bool + 'static>( &self, f: F ) -> SignalHandlerId

Emitted on the drop site when the user drops the data onto the widget.

The signal handler must determine whether the pointer position is in a drop zone or not. If it is not in a drop zone, it returns false and no further processing is necessary.

Otherwise, the handler returns true. In this case, this handler will accept the drop. The handler must ensure that Drop::finish() is called to let the source know that the drop is done. The call to Drop::finish() must only be done when all data has been received.

To receive the data, use one of the read functions provided by gdk::Drop such as Drop::read_async() or Drop::read_value_async().

drop

the gdk::Drop

x

the x coordinate of the current pointer position

y

the y coordinate of the current pointer position

Returns

whether the drop is accepted at the given pointer position

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

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

Trait Implementations§

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impl Clone for DropTargetAsync

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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 DropTargetAsync

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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 DropTargetAsync

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fn default() -> Self

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

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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 HasParamSpec for DropTargetAsync

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type ParamSpec = ParamSpecObject

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type SetValue = DropTargetAsync

Preferred value to be used as setter for the associated ParamSpec.
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type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, DropTargetAsync>

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fn param_spec_builder() -> Self::BuilderFn

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impl Hash for DropTargetAsync

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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 DropTargetAsync

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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 DropTargetAsync

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

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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 DropTargetAsync

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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 DropTargetAsync

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for DropTargetAsync

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impl IsA<EventController> for DropTargetAsync

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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unsafe fn from_glib_full_as_vec(ptr: *mut GList) -> Vec<T, Global>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere T: GlibPtrDefault + FromGlibPtrNone<<T as GlibPtrDefault>::GlibType> + FromGlibPtrFull<<T as GlibPtrDefault>::GlibType>,

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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
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Sets the property property_name of the object to value value. Read more
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Sets multiple properties of the object at once. Read more
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Sets multiple properties of the object at once. Read more
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Get the type of the property property_name of this object. Read more
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Get the ParamSpec of the property property_name of this object.
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Return all ParamSpec of the properties of this object.
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fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

Freeze all property notifications until the return guard object is dropped. Read more
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unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where QD: 'static,

Set arbitrary data on this object with the given key. Read more
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Return previously set arbitrary data of this object with the given key. Read more
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Retrieve previously set arbitrary data of this object with the given key. Read more
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Block a given signal handler. Read more
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Unblock a given signal handler.
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Stop emission of the currently emitted signal.
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Stop emission of the currently emitted signal by the (possibly detailed) signal name.
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Connect to the signal signal_id on this object. Read more
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Connect 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.
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Emit signal by its name with details. Read more
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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 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 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 add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + Send + 'static,

Add a callback to be notified when the Object is disposed.
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fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>where F: FnOnce() + 'static,

Add a callback to be notified when the Object is disposed. Read more
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fn bind_property<'f, 't, O, 'a>( &'a self, source_property: &'a str, target: &'a O, target_property: &'a str ) -> BindingBuilder<'a, 'f, 't>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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unsafe fn run_dispose(&self)

Runs the dispose mechanism of the object. Read more
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impl<T> Property for Twhere T: HasParamSpec,

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type Value = T

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impl<T> PropertyGet for Twhere T: HasParamSpec,

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type Value = T

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fn get<R, F>(&self, f: F) -> Rwhere F: Fn(&<T as PropertyGet>::Value) -> R,

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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> 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> TransparentType for Twhere T: TransparentPtrType,

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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.
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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.
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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, E> FromValueOptional<'a> for Twhere T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + 'static,