Implement `DataTransfer` and related interfaces (#34205)

* add datatransfer interfaces

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* implement DataTransfer interface

implemented Constructor, setter and getter for drop_effect and effect_allowed, Items and SetDragImage

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* implement DataTransferItem interface

Implemented Kind, Type, GetAsString, GetAsFile.
Marked DataTransfer as weakReferenceable to access its field
inside DataTransferItemList and DataTransferItem.
Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* implement DataTransferItemList interface

implemented Lenght, Getter, Add, Remove, Clear
Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* added DataTransfer's old interface

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* DataTransfer: implemented GetData, SetData, SetData

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* set Weakref to DataTransfer in DataTransferItemList and DataTransferItem

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* DataTransfer: implemented Types and Files

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* cleanup get_data, set_data, clear_data

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* fix clippy warning

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* add drag data store

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* fix DataTransfer's Types() behaviour

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* DataTransferItem: use the underlying drag data store

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* fix DataTransferItemList's getter and remove

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* fix clippy warnings

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

* update test expectations

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

---------

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/components/script/dom/datatransferitem.rs b/components/script/dom/datatransferitem.rs
new file mode 100644
index 00000000000..2144666421d
--- /dev/null
+++ b/components/script/dom/datatransferitem.rs
@@ -0,0 +1,66 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use std::rc::Rc;
+
+use dom_struct::dom_struct;
+
+use crate::dom::bindings::callback::ExceptionHandling;
+use crate::dom::bindings::codegen::Bindings::DataTransferItemBinding::{
+    DataTransferItemMethods, FunctionStringCallback,
+};
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::file::File;
+use crate::dom::globalscope::GlobalScope;
+use crate::drag_data_store::Kind;
+
+#[dom_struct]
+pub struct DataTransferItem {
+    reflector_: Reflector,
+    #[ignore_malloc_size_of = "TODO"]
+    #[no_trace]
+    item: Kind,
+}
+
+impl DataTransferItem {
+    fn new_inherited(item: Kind) -> DataTransferItem {
+        DataTransferItem {
+            reflector_: Reflector::new(),
+            item,
+        }
+    }
+
+    pub fn new(global: &GlobalScope, item: Kind) -> DomRoot<DataTransferItem> {
+        reflect_dom_object(Box::new(DataTransferItem::new_inherited(item)), global)
+    }
+}
+
+impl DataTransferItemMethods<crate::DomTypeHolder> for DataTransferItem {
+    /// <https://html.spec.whatwg.org/multipage/#dom-datatransferitem-kind>
+    fn Kind(&self) -> DOMString {
+        match self.item {
+            Kind::Text(_) => DOMString::from("string"),
+            Kind::File(_) => DOMString::from("file"),
+        }
+    }
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-datatransferitem-type>
+    fn Type(&self) -> DOMString {
+        self.item.type_()
+    }
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-datatransferitem-getasstring>
+    fn GetAsString(&self, callback: Option<Rc<FunctionStringCallback>>) {
+        if let (Some(callback), Some(data)) = (callback, self.item.as_string()) {
+            let _ = callback.Call__(data, ExceptionHandling::Report);
+        }
+    }
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-datatransferitem-getasfile>
+    fn GetAsFile(&self) -> Option<DomRoot<File>> {
+        self.item.as_file(&self.global())
+    }
+}