/**
* JavaScript for Special:Upload
* Note that additional code still lives in skins/common/upload.js
*/
( function ( mw, $ ) {
/**
* Add a preview to the upload form
*/
$( function () {
/**
* Is the FileAPI available with sufficient functionality?
*/
function hasFileAPI() {
return window.FileReader !== undefined;
}
/**
* Check if this is a recognizable image type...
* Also excludes files over 10M to avoid going insane on memory usage.
*
* @todo is there a way we can ask the browser what's supported in <img>s?
* @todo put SVG back after working around Firefox 7 bug <https://bugzilla.wikimedia.org/show_bug.cgi?id=31643>
*
* @param {File} file
* @return boolean
*/
function fileIsPreviewable( file ) {
var known = ['image/png', 'image/gif', 'image/jpeg', 'image/svg+xml'],
tooHuge = 10 * 1024 * 1024;
return ( $.inArray( file.type, known ) !== -1 ) && file.size > 0 && file.size < tooHuge;
}
/**
* Show a thumbnail preview of PNG, JPEG, GIF, and SVG files prior to upload
* in browsers supporting HTML5 FileAPI.
*
* As of this writing, known good:
* - Firefox 3.6+
* - Chrome 7.something
*
* @todo check file size limits and warn of likely failures
*
* @param {File} file
*/
function showPreview( file ) {
var $canvas,
ctx,
meta,
previewSize = 180,
thumb = $( '<div id="mw-upload-thumbnail" class="thumb tright">' +
'<div class="thumbinner">' +
'<div class="mw-small-spinner" style="width: 180px; height: 180px"></div>' +
'<div class="thumbcaption"><div class="filename"></div><div class="fileinfo"></div></div>' +
'</div>' +
'</div>' );
thumb.find( '.filename' ).text( file.name ).end()
.find( '.fileinfo' ).text( prettySize( file.size ) ).end();
$canvas = $('<canvas width="' + previewSize + '" height="' + previewSize + '" ></canvas>');
ctx = $canvas[0].getContext( '2d' );
$( '#mw-htmlform-source' ).parent().prepend( thumb );
fetchPreview( file, function ( dataURL ) {
var img = new Image(),
rotation = 0;
if ( meta && meta.tiff && meta.tiff.Orientation ) {
rotation = ( 360 - ( function () {
// See includes/media/Bitmap.php
switch ( meta.tiff.Orientation.value ) {
case 8:
return 90;
case 3:
return 180;
case 6:
return 270;
default:
return 0;
}
}() ) ) % 360;
}
img.onload = function () {
var info, width, height, x, y, dx, dy, logicalWidth, logicalHeight;
// Fit the image within the previewSizexpreviewSize box
if ( img.width > img.height ) {
width = previewSize;
height = img.height / img.width * previewSize;
} else {
height = previewSize;
width = img.width / img.height * previewSize;
}
// Determine the offset required to center the image
dx = (180 - width) / 2;
dy = (180 - height) / 2;
switch ( rotation ) {
// If a rotation is applied, the direction of the axis
// changes as well. You can derive the values below by
// drawing on paper an axis system, rotate it and see
// where the positive axis direction is
case 0:
x = dx;
y = dy;
logicalWidth = img.width;
logicalHeight = img.height;
break;
case 90:
x = dx;
y = dy - previewSize;
logicalWidth = img.height;
logicalHeight = img.width;
break;
case 180:
x = dx - previewSize;
y = dy - previewSize;
logicalWidth = img.width;
logicalHeight = img.height;
break;
case 270:
x = dx - previewSize;
y = dy;
logicalWidth = img.height;
logicalHeight = img.width;
break;
}
ctx.clearRect( 0, 0, 180, 180 );
ctx.rotate( rotation / 180 * Math.PI );
ctx.drawImage( img, x, y, width, height );
thumb.find('.mw-small-spinner').replaceWith($canvas);
// Image size
info = mw.msg( 'widthheight', logicalWidth, logicalHeight ) +
', ' + prettySize( file.size );
$( '#mw-upload-thumbnail .fileinfo' ).text( info );
};
img.src = dataURL;
}, mw.config.get( 'wgFileCanRotate' ) ? function ( data ) {
/*jshint camelcase: false, nomen: false */
try {
meta = mw.libs.jpegmeta( data, file.fileName );
meta._binary_data = null;
} catch ( e ) {
meta = null;
}
} : null );
}
/**
* Start loading a file into memory; when complete, pass it as a
* data URL to the callback function. If the callbackBinary is set it will
* first be read as binary and afterwards as data URL. Useful if you want
* to do preprocessing on the binary data first.
*
* @param {File} file
* @param {function} callback
* @param {function} callbackBinary
*/
function fetchPreview( file, callback, callbackBinary ) {
var reader = new FileReader();
if ( callbackBinary && 'readAsBinaryString' in reader ) {
// To fetch JPEG metadata we need a binary string; start there.
// todo:
reader.onload = function() {
callbackBinary( reader.result );
// Now run back through the regular code path.
fetchPreview( file, callback );
};
reader.readAsBinaryString( file );
} else if ( callbackBinary && 'readAsArrayBuffer' in reader ) {
// readAsArrayBuffer replaces readAsBinaryString
// However, our JPEG metadata library wants a string.
// So, this is going to be an ugly conversion.
reader.onload = function() {
var i,
buffer = new Uint8Array( reader.result ),
string = '';
for ( i = 0; i < buffer.byteLength; i++ ) {
string += String.fromCharCode( buffer[i] );
}
callbackBinary( string );
// Now run back through the regular code path.
fetchPreview( file, callback );
};
reader.readAsArrayBuffer( file );
} else if ( 'URL' in window && 'createObjectURL' in window.URL ) {
// Supported in Firefox 4.0 and above <https://developer.mozilla.org/en/DOM/window.URL.createObjectURL>
// WebKit has it in a namespace for now but that's ok. ;)
//
// Lifetime of this URL is until document close, which is fine
// for Special:Upload -- if this code gets used on longer-running
// pages, add a revokeObjectURL() when it's no longer needed.
//
// Prefer this over readAsDataURL for Firefox 7 due to bug reading
// some SVG files from data URIs <https://bugzilla.mozilla.org/show_bug.cgi?id=694165>
callback( window.URL.createObjectURL( file ) );
} else {
// This ends up decoding the file to base-64 and back again, which
// feels horribly inefficient.
reader.onload = function () {
callback( reader.result );
};
reader.readAsDataURL( file );
}
}
/**
* Format a file size attractively.
* @todo match numeric formatting
*
* @param {number} s
* @return string
*/
function prettySize( s ) {
var sizeMsgs = ['size-bytes', 'size-kilobytes', 'size-megabytes', 'size-gigabytes'];
while ( s >= 1024 && sizeMsgs.length > 1 ) {
s /= 1024;
sizeMsgs = sizeMsgs.slice( 1 );
}
return mw.msg( sizeMsgs[0], Math.round( s ) );
}
/**
* Clear the file upload preview area.
*/
function clearPreview() {
$( '#mw-upload-thumbnail' ).remove();
}
/**
* Check if the file does not exceed the maximum size
*/
function checkMaxUploadSize( file ) {
var maxSize, $error;
function getMaxUploadSize( type ) {
var sizes = mw.config.get( 'wgMaxUploadSize' );
if ( sizes[type] !== undefined ) {
return sizes[type];
}
return sizes['*'];
}
$( '.mw-upload-source-error' ).remove();
maxSize = getMaxUploadSize( 'file' );
if ( file.size > maxSize ) {
$error = $( '<p class="error mw-upload-source-error" id="wpSourceTypeFile-error">' +
mw.message( 'largefileserver', file.size, maxSize ).escaped() + '</p>' );
$( '#wpUploadFile' ).after( $error );
return false;
}
return true;
}
/**
* Initialization
*/
if ( hasFileAPI() ) {
// Update thumbnail when the file selection control is updated.
$( '#wpUploadFile' ).change( function () {
clearPreview();
if ( this.files && this.files.length ) {
// Note: would need to be updated to handle multiple files.
var file = this.files[0];
if ( !checkMaxUploadSize( file ) ) {
return;
}
if ( fileIsPreviewable( file ) ) {
showPreview( file );
}
}
} );
}
} );
/**
* Disable all upload source fields except the selected one
*/
$( function () {
var i, $row,
$rows = $( '.mw-htmlform-field-UploadSourceField' );
function createHandler( $currentRow ) {
/**
* @param {jQuery.Event}
*/
return function () {
$( '.mw-upload-source-error' ).remove();
if ( this.checked ) {
// Disable all inputs
$rows.find( 'input[name!="wpSourceType"]' ).prop( 'disabled', true );
// Re-enable the current one
$currentRow.find( 'input' ).prop( 'disabled', false );
}
};
}
for ( i = $rows.length; i; i-- ) {
$row = $rows.eq(i - 1);
$row
.find( 'input[name="wpSourceType"]' )
.change( createHandler( $row ) );
}
} );
}( mediaWiki, jQuery ) );