Struct gdk4::Drop [−][src]
pub struct Drop(_);Expand description
The Drop object represents the target of an ongoing DND operation.
Possible drop sites get informed about the status of the ongoing drag
operation with events of type EventType::DragEnter, EventType::DragLeave,
EventType::DragMotion and EventType::DropStart. The Drop object can be obtained
from these Event types using DNDEvent::drop().
The actual data transfer is initiated from the target side via an async
read, using one of the Drop methods for this purpose:
read_async() or read_value_async().
GTK provides a higher level abstraction based on top of these functions, and so they are not normally needed in GTK applications. See the “Drag and Drop” section of the GTK documentation for more information.
This is an Abstract Base Class, you cannot instantiate it.
Implementations
Returns the possible actions for this Drop.
If this value contains multiple actions - i.e.
DragAction::is_unique() returns false for the result -
finish() must choose the action to use when
accepting the drop. This will only happen if you passed
DragAction::ASK as one of the possible actions in
status(). DragAction::ASK itself will not
be included in the actions returned by this function.
This value may change over the lifetime of the Drop
both as a response to source side actions as well as to calls to
status() or finish(). The source
side will not change this value anymore once a drop has started.
Returns
The possible GdkDragActions
Returns the ContentFormats that the drop offers the data
to be read in.
Returns
The possible ContentFormats
Selects all actions that are potentially supported by the destination.
When calling this function, do not restrict the passed in actions to
the ones provided by actions(). Those actions may
change in the future, even depending on the actions you provide here.
The preferred action is a hint to the drag-and-drop mechanism about which
action to use when multiple actions are possible.
This function should be called by drag destinations in response to
EventType::DragEnter or EventType::DragMotion events. If the destination does
not yet know the exact actions it supports, it should set any possible
actions first and then later call this function again.
actions
Supported actions of the destination, or 0 to indicate that a drop will not be accepted
preferred
A unique action that’s a member of actions indicating the
preferred action
Asynchronously read the dropped data from a Drop
in a format that complies with one of the mime types.
mime_types
pointer to an array of mime types
io_priority
the I/O priority for the read operation
cancellable
optional GCancellable object
callback
a GAsyncReadyCallback to call when
the request is satisfied
pub fn read_async_future(
&self,
mime_types: &[&str],
io_priority: Priority
) -> Pin<Box<dyn Future<Output = Result<(InputStream, GString), Error>> + 'static>>
Asynchronously request the drag operation’s contents converted
to the given type_.
When the operation is finished callback will be called. You must
then call Gdk::Drop::read_value_finish()`` to get the resulting
GValue.
For local drag-and-drop operations that are available in the given
GType, the value will be copied directly. Otherwise, GDK will
try to use content_deserialize_async() to convert the data.
type_
a GType to read
io_priority
the I/O priority of the request.
cancellable
optional GCancellable object, None to ignore.
callback
callback to call when the request is satisfied
Trait Implementations
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
Returns the type identifier of Self.
Auto Trait Implementations
impl RefUnwindSafe for Drop
impl UnwindSafe for Drop
Blanket Implementations
Mutably borrows from an owned value. Read more
Upcasts an object to a superclass or interface T. Read more
Upcasts an object to a reference of its superclass or interface T. Read more
Tries to downcast to a subclass or interface implementor T. Read more
Tries to downcast to a reference of its subclass or interface implementor T. Read more
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 true if the object is an instance of (can be cast to) T.
pub fn set_property<'a, N, V>(
&self,
property_name: N,
value: V
) -> Result<(), BoolError> where
N: Into<&'a str>,
V: ToValue,
pub fn set_property_from_value<'a, N>(
&self,
property_name: N,
value: &Value
) -> Result<(), BoolError> where
N: Into<&'a str>,
pub fn set_properties_from_value(
&self,
property_values: &[(&str, Value)]
) -> Result<(), BoolError>
pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where
N: Into<&'a str>,
pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where
N: Into<&'a str>,
Safety Read more
Safety Read more
Safety Read more
Safety Read more
pub fn connect<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: 'static + Fn(&[Value]) -> Option<Value> + Send + Sync,
Same as connect but takes a SignalId instead of a signal name.
pub fn connect_local<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: 'static + Fn(&[Value]) -> Option<Value>,
Same as connect_local but takes a SignalId instead of a signal name.
pub unsafe fn connect_unsafe<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: Fn(&[Value]) -> Option<Value>,
Same as connect_unsafe but takes a SignalId instead of a signal name.
Emit signal by signal id.
Same as emit but takes Value for the arguments.
Emit signal by its name.
Same as emit_by_name but takes Value for the arguments.
Emit signal with details by signal id.
Same as emit_with_details but takes Value for the arguments.
pub fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId where
F: 'static + Fn(&T, &ParamSpec) + Send + Sync,
pub fn connect_notify_local<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerId where
F: 'static + Fn(&T, &ParamSpec),
pub unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerId where
F: Fn(&T, &ParamSpec),
pub fn bind_property<'a, O, N, M>(
&'a self,
source_property: N,
target: &'a O,
target_property: M
) -> BindingBuilder<'a> where
O: ObjectType,
N: Into<&'a str>,
M: Into<&'a str>,
Returns a SendValue clone of self.