Struct gtk4::DropTargetAsync
source · #[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
Implementations§
source§impl DropTargetAsync
impl DropTargetAsync
sourcepub fn new(
formats: Option<ContentFormats>,
actions: DragAction
) -> DropTargetAsync
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
sourcepub fn builder() -> DropTargetAsyncBuilder
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.
sourcepub fn actions(&self) -> DragAction
pub fn actions(&self) -> DragAction
sourcepub fn formats(&self) -> Option<ContentFormats>
pub fn formats(&self) -> Option<ContentFormats>
sourcepub fn reject_drop(&self, drop: &Drop)
pub fn reject_drop(&self, drop: &Drop)
sourcepub fn set_actions(&self, actions: DragAction)
pub fn set_actions(&self, actions: DragAction)
sourcepub fn set_formats(&self, formats: Option<&ContentFormats>)
pub fn set_formats(&self, formats: Option<&ContentFormats>)
sourcepub fn connect_accept<F: Fn(&Self, &Drop) -> bool + 'static>(
&self,
f: F
) -> SignalHandlerId
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
sourcepub fn connect_drag_enter<F: Fn(&Self, &Drop, f64, f64) -> DragAction + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_drag_enter<F: Fn(&Self, &Drop, f64, f64) -> DragAction + 'static>( &self, f: F ) -> SignalHandlerId
sourcepub fn connect_drag_leave<F: Fn(&Self, &Drop) + 'static>(
&self,
f: F
) -> SignalHandlerId
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
sourcepub fn connect_drag_motion<F: Fn(&Self, &Drop, f64, f64) -> DragAction + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_drag_motion<F: Fn(&Self, &Drop, f64, f64) -> DragAction + 'static>( &self, f: F ) -> SignalHandlerId
sourcepub fn connect_drop<F: Fn(&Self, &Drop, f64, f64) -> bool + 'static>(
&self,
f: F
) -> SignalHandlerId
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
pub fn connect_actions_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
pub fn connect_formats_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Trait Implementations§
source§impl Clone for DropTargetAsync
impl Clone for DropTargetAsync
source§impl Debug for DropTargetAsync
impl Debug for DropTargetAsync
source§impl Default for DropTargetAsync
impl Default for DropTargetAsync
source§impl Display for DropTargetAsync
impl Display for DropTargetAsync
source§impl HasParamSpec for DropTargetAsync
impl HasParamSpec for DropTargetAsync
type ParamSpec = ParamSpecObject
§type SetValue = DropTargetAsync
type SetValue = DropTargetAsync
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, DropTargetAsync>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for DropTargetAsync
impl Hash for DropTargetAsync
source§impl Ord for DropTargetAsync
impl Ord for DropTargetAsync
source§impl ParentClassIs for DropTargetAsync
impl ParentClassIs for DropTargetAsync
type Parent = EventController
source§impl<OT: ObjectType> PartialEq<OT> for DropTargetAsync
impl<OT: ObjectType> PartialEq<OT> for DropTargetAsync
source§impl<OT: ObjectType> PartialOrd<OT> for DropTargetAsync
impl<OT: ObjectType> PartialOrd<OT> for DropTargetAsync
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 DropTargetAsync
impl StaticType for DropTargetAsync
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for DropTargetAsync
impl IsA<EventController> for DropTargetAsync
Auto Trait Implementations§
impl RefUnwindSafe for DropTargetAsync
impl !Send for DropTargetAsync
impl !Sync for DropTargetAsync
impl Unpin for DropTargetAsync
impl UnwindSafe for DropTargetAsync
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when using Rust closures.source§fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
Self::emit
but takes Value
for the arguments.source§fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Option<Value>
source§fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Option<Value>
source§fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> Rwhere R: TryFromClosureReturnValue,
source§fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Option<Value>
source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + 'static,
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more