initial commit file-selector.js

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diff --git a/js/file-selector.js b/js/file-selector.js
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+/*
+ * file-selector.js - Add support for drag and drop file selection, and paste from clipbboard on supported browsers.
+ *
+ * Usage:
+ *   $config['additional_javascript'][] = 'js/jquery.min.js';
+ *   $config['additional_javascript'][] = 'js/file-selector.js';
+ */
+
+onready(function () {
+
+// add options panel item
+$(document).ready(function () {
+	if (window.Options && Options.get_tab('general')) {
+		Options.extend_tab('general', '<label id="file-drag-drop"><input type="checkbox">' + _('Drag and drop file selection') + '</label>');
+
+		$('#file-drag-drop>input').on('click', function() {
+			if ($('#file-drag-drop>input').is(':checked')) {
+				localStorage.file_dragdrop = 'true';
+			} else {
+				localStorage.file_dragdrop = 'false';
+			}
+		});
+
+		if (localStorage.file_dragdrop === 'undefined') localStorage.file_dragdrop = 'true';
+		if (localStorage.file_dragdrop === 'true') $('#file-drag-drop>input').prop('checked', true);
+	}
+});
+
+// disabled by user, or incompatible browser.
+// fallback to old
+if (localStorage.file_dragdrop == 'false' || !(window.FileReader || window.File)) {
+	$('.dropzone-wrap').remove();
+	$('#upload_file').show();
+
+	return;
+}
+
+// multipost not enabled
+if (typeof max_images == 'undefined') {
+	var max_images = 1;
+}
+
+var files = [];
+
+function addFile(file) {
+	if (files.length == max_images)
+		return;
+
+	files.push(file);
+	addThumb(file);
+}
+
+function removeFile(file) {
+	files.splice(files.indexOf(file), 1);
+}
+
+function getThumbElement(file) {
+	return $('.tmb-container').filter(function(){return($(this).data('file-ref')==file);});
+}
+
+function addThumb(file) {
+
+	var fileName = (file.name.length < 24) ? file.name : file.name.substr(0, 22) + '…';
+	var fileType = file.type.split('/')[0];
+	var fileExt = file.type.split('/')[1];
+	var $fileThumb;
+
+	$('.file-thumbs').append($('<div>')
+		.addClass('tmb-container')
+		.data('file-ref', file)
+		.append(
+			$('<div>').addClass('remove-btn').html('✖'),
+			$('<div>').addClass('file-tmb'),
+			$('<div>').addClass('tmb-filename').html(fileName)
+		)
+	);
+
+	if (fileType == 'image') {
+		// if image file, generate thumbnail
+		var reader = new FileReader();
+
+		reader.onloadend = function () {
+			var dataURL = reader.result;
+			var $fileThumb = getThumbElement(file).find('.file-tmb');
+			$fileThumb.css('background-image', 'url('+ dataURL +')');
+		};
+
+		reader.readAsDataURL(file);
+	} else {
+		$fileThumb = getThumbElement(file).find('.file-tmb');
+		$fileThumb.html('<span>' + fileExt.toUpperCase() + '</span>');
+	}
+}
+
+$(document).on('ajax_before_post', function (e, formData) {
+	var i;
+
+	for (i=0; i<max_images; i++) {
+		var key = 'file';
+		if (i > 0) key += i + 1;
+		formData.append(key, files[i]);
+	}
+
+	// clear file queue and UI
+	files = [];
+	$('.file-thumbs').empty();
+});
+
+var dragCounter = 0;
+var dropHandlers = {
+	dragenter: function (e) {
+		e.stopPropagation();
+		e.preventDefault();
+
+		if (dragCounter === 0) $(this).addClass('dragover');
+		dragCounter++;
+	},
+	dragover: function (e) {
+		// needed for webkit to work
+		e.stopPropagation();
+		e.preventDefault();
+	},
+	dragleave: function (e) {
+		e.stopPropagation();
+		e.preventDefault();
+
+		dragCounter--;
+		if (dragCounter === 0) $(this).removeClass('dragover');
+	},
+	drop: function (e) {
+		e.stopPropagation();
+		e.preventDefault();
+
+		$(this).removeClass('dragover');
+		dragCounter = 0;
+
+		var fileList = e.originalEvent.dataTransfer.files;
+		for (var i=0; i<fileList.length; i++) {
+			addFile(fileList[i]);
+		}
+	}
+};
+
+$('.dropzone').css('user-select', 'none')  // let jquery add browser specific prefix
+
+// attach handlers
+$(document).on(dropHandlers, '.dropzone');
+
+$(document).on('click', '.dropzone .remove-btn', function (e) {
+	var file = $(e.target).parent().data('file-ref');
+
+	removeFile(file);
+	$(e.target).parent().remove();
+});
+
+$(document).on('click', '.dropzone .file-hint', function (e) {
+	var $fileSelector = $('<input type="file" multiple>');
+
+	$fileSelector.on('change', function (e) {
+		if (this.files.length > 0) {
+			for (var i=0; i<this.files.length; i++) {
+				addFile(this.files[i]);
+			}
+		}
+		$(this).remove();
+	});
+
+	$fileSelector.click();
+});
+
+$(document).on('paste', function (e) {
+	var clipboard = e.originalEvent.clipboardData;
+	if (typeof clipboard.items != 'undefined' && clipboard.items.length != 0) {
+		
+		//Webkit
+		for (var i=0; i<clipboard.items.length; i++) {
+			if (clipboard.items[i].kind != 'file')
+				continue;
+
+			//convert blob to file
+			var file = new File([clipboard.items[i].getAsFile()], 'ClipboardImage.png', {type: 'image/png'});
+			addFile(file);
+		}
+	}
+});
+
+});