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use webcore::value::{Value, Reference};
use webcore::try_from::TryInto;
use webcore::reference_type::ReferenceType;
use webapi::file::File;
/// An object of this type is returned by the files property of the HTML `<input>` element;
/// this lets you access the list of files selected with the `<input type="file">` element.
/// It's also used for a list of files dropped into web content when using the drag and drop API.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/FileList)
// https://w3c.github.io/FileAPI/#dfn-filelist
#[derive(Clone, Debug, PartialEq, Eq, ReferenceType)]
#[reference(instance_of = "FileList")]
pub struct FileList( Reference );
impl FileList {
/// Returns the number of [File](struct.File.html)s contained in this list.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/FileList/length)
// https://w3c.github.io/FileAPI/#ref-for-dfn-length
pub fn len( &self ) -> u32 {
js!( return @{self}.length; ).try_into().unwrap()
}
/// Returns an iterator over the list.
pub fn iter( &self ) -> FileIter {
FileIter {
list: self.clone(),
index: 0
}
}
}
impl IntoIterator for FileList {
type Item = File;
type IntoIter = FileIter;
#[inline]
fn into_iter( self ) -> Self::IntoIter {
FileIter {
list: self,
index: 0
}
}
}
impl< 'a > IntoIterator for &'a FileList {
type Item = File;
type IntoIter = FileIter;
#[inline]
fn into_iter( self ) -> Self::IntoIter {
FileIter {
list: self.clone(),
index: 0
}
}
}
#[derive(Debug)]
pub struct FileIter {
list: FileList,
index: i32
}
impl Iterator for FileIter {
type Item = File;
fn next( &mut self ) -> Option< Self::Item > {
let value = js!(
return @{&self.list}[ @{self.index} ];
);
let file = match value {
Value::Undefined => return None,
Value::Reference( reference ) => unsafe { File::from_reference_unchecked( reference ) },
_ => unreachable!()
};
self.index += 1;
Some( file )
}
}