stdweb/webapi/
file_list.rs

1use webcore::value::{Value, Reference};
2use webcore::try_from::TryInto;
3use webcore::reference_type::ReferenceType;
4use webapi::file::File;
5
6/// An object of this type is returned by the files property of the HTML `<input>` element;
7/// this lets you access the list of files selected with the `<input type="file">` element.
8/// It's also used for a list of files dropped into web content when using the drag and drop API.
9///
10/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/FileList)
11// https://w3c.github.io/FileAPI/#dfn-filelist
12#[derive(Clone, Debug, PartialEq, Eq, ReferenceType)]
13#[reference(instance_of = "FileList")]
14pub struct FileList( Reference );
15
16impl FileList {
17    /// Returns the number of [File](struct.File.html)s contained in this list.
18    ///
19    /// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/FileList/length)
20    // https://w3c.github.io/FileAPI/#ref-for-dfn-length
21    pub fn len( &self ) -> u32 {
22        js!( return @{self}.length; ).try_into().unwrap()
23    }
24
25    /// Returns an iterator over the list.
26    pub fn iter( &self ) -> FileIter {
27        FileIter {
28            list: self.clone(),
29            index: 0
30        }
31    }
32}
33
34impl IntoIterator for FileList {
35    type Item = File;
36    type IntoIter = FileIter;
37
38    #[inline]
39    fn into_iter( self ) -> Self::IntoIter {
40        FileIter {
41            list: self,
42            index: 0
43        }
44    }
45}
46
47impl< 'a > IntoIterator for &'a FileList {
48    type Item = File;
49    type IntoIter = FileIter;
50
51    #[inline]
52    fn into_iter( self ) -> Self::IntoIter {
53        FileIter {
54            list: self.clone(),
55            index: 0
56        }
57    }
58}
59
60#[derive(Debug)]
61pub struct FileIter {
62    list: FileList,
63    index: i32
64}
65
66impl Iterator for FileIter {
67    type Item = File;
68    fn next( &mut self ) -> Option< Self::Item > {
69        let value = js!(
70            return @{&self.list}[ @{self.index} ];
71        );
72
73        let file = match value {
74            Value::Undefined => return None,
75            Value::Reference( reference ) => unsafe { File::from_reference_unchecked( reference ) },
76            _ => unreachable!()
77        };
78
79        self.index += 1;
80        Some( file )
81    }
82}
stdweb/webapi/file_list.rs

stdweb/webapi/
file_list.rs
