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Added automatic image resizing functionality.
Greatly improved the browser responsiveness when loading the preview images.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| /* | ||
| * jQuery File Upload Image Processing Plugin 1.0 | ||
| * https://github.com/blueimp/jQuery-File-Upload | ||
| * | ||
| * Copyright 2012, Sebastian Tschan | ||
| * https://blueimp.net | ||
| * | ||
| * Licensed under the MIT license: | ||
| * http://www.opensource.org/licenses/MIT | ||
| */ | ||
|
|
||
| /*jslint nomen: true, unparam: true, regexp: true */ | ||
| /*global define, window, document */ | ||
|
|
||
| (function (factory) { | ||
| 'use strict'; | ||
| if (typeof define === 'function' && define.amd) { | ||
| // Register as an anonymous AMD module: | ||
| define([ | ||
| 'jquery', | ||
| './load-image.js', | ||
| './canvas-to-blob.js', | ||
| './jquery.fileupload.js' | ||
| ], factory); | ||
| } else { | ||
| // Browser globals: | ||
| factory( | ||
| window.jQuery, | ||
| window.loadImage, | ||
| window.canvasToBlob | ||
| ); | ||
| } | ||
| }(function ($, loadImage, canvasToBlob) { | ||
| 'use strict'; | ||
|
|
||
| // The File Upload IP version extends the basic fileupload widget | ||
| // with image processing functionality: | ||
| $.widget('blueimpIP.fileupload', $.blueimp.fileupload, { | ||
|
|
||
| options: { | ||
| // The regular expression to define which image files are to be | ||
| // resized, given that the browser supports the operation: | ||
| resizeSourceFileTypes: /^image\/(gif|jpeg|png)$/, | ||
| // The maximum file size of images that are to be resized: | ||
| resizeSourceMaxFileSize: 20000000, // 20MB | ||
| // The maximum width of the resized images: | ||
| resizeMaxWidth: undefined, | ||
| // The maximum height of the resized images: | ||
| resizeMaxHeight: undefined, | ||
| // The minimum width of the resized images: | ||
| resizeMinWidth: undefined, | ||
| // The minimum height of the resized images: | ||
| resizeMinHeight: undefined, | ||
|
|
||
| // The add callback is invoked as soon as files are added to the fileupload | ||
| // widget (via file input selection, drag & drop or add API call). | ||
| // See the basic file upload widget for more information: | ||
| add: function (e, data) { | ||
| $(this).fileupload('resize', data).done(function () { | ||
| data.submit(); | ||
| }); | ||
| } | ||
| }, | ||
|
|
||
| // Resizes the image file at the given index and stores the created blob | ||
| // at the original position of the files list, returns a Promise object: | ||
| _resizeImage: function (files, index) { | ||
| var that = this, | ||
| options = this.options, | ||
| file = files[index], | ||
| deferred = $.Deferred(), | ||
| canvas, | ||
| blob; | ||
| loadImage( | ||
| file, | ||
| function (img) { | ||
| var width = img.width, | ||
| height = img.height; | ||
| canvas = loadImage.scale(img, { | ||
| maxWidth: options.resizeMaxWidth, | ||
| maxHeight: options.resizeMaxHeight, | ||
| minWidth: options.resizeMinWidth, | ||
| minHeight: options.resizeMinHeight, | ||
| canvas: true | ||
| }); | ||
| if (width !== canvas.width || height !== canvas.height) { | ||
| canvasToBlob(canvas, function (blob) { | ||
| if (!blob.name) { | ||
| if (file.type === blob.type) { | ||
| blob.name = file.name; | ||
| } else if (file.name) { | ||
| blob.name = file.name.replace( | ||
| /\..+$/, | ||
| '.' + blob.type.substr(6) | ||
| ); | ||
| } | ||
| } | ||
| files[index] = blob; | ||
| deferred.resolve(); | ||
| }, file); | ||
| } else { | ||
| deferred.resolve(); | ||
| } | ||
| } | ||
| ); | ||
| return deferred.promise(); | ||
| }, | ||
|
|
||
| // Resizes the images given as files property of the data parameter, | ||
| // returns a Promise object that allows to bind a done handler, which | ||
| // will be invoked after processing all images is done: | ||
| resize: function (data) { | ||
| var that = this, | ||
| options = $.extend({}, this.options, data), | ||
| resizeAll = $.type(options.resizeSourceMaxFileSize) !== 'number'; | ||
| $.each(data.files, function (index, file) { | ||
| if (that._resizeSupport && | ||
| (options.resizeMaxWidth || options.resizeMaxHeight || | ||
| options.resizeMinWidth || options.resizeMinHeight) && | ||
| (resizeAll || file.size < options.resizeSourceMaxFileSize) && | ||
| options.resizeSourceFileTypes.test(file.type)) { | ||
| that._processing += 1; | ||
| if (that._processing === 1) { | ||
| that.element.addClass('fileupload-processing'); | ||
| } | ||
| that._processingQueue = that._processingQueue.pipe(function () { | ||
| var deferred = $.Deferred(); | ||
| that._resizeImage( | ||
| data.files, | ||
| index | ||
| ).done(function () { | ||
| that._processing -= 1; | ||
| if (that._processing === 0) { | ||
| that.element | ||
| .removeClass('fileupload-processing'); | ||
| } | ||
| deferred.resolve(); | ||
| }); | ||
| return deferred.promise(); | ||
| }); | ||
| } | ||
| }); | ||
| return this._processingQueue; | ||
| }, | ||
|
|
||
| _create: function () { | ||
| $.blueimp.fileupload.prototype._create.call(this); | ||
| this._processing = 0; | ||
| this._processingQueue = $.Deferred().resolveWith(this).promise(); | ||
| this._resizeSupport = canvasToBlob( | ||
| document.createElement('canvas'), | ||
| $.noop | ||
| ); | ||
| } | ||
|
|
||
| }); | ||
|
|
||
| })); |
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