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wp-content/plugins/file-manager-advanced/application/library/js/commands/copy.js

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+/**
+ * @class elFinder command "copy".
+ * Put files in filemanager clipboard.
+ *
+ * @type  elFinder.command
+ * @author  Dmitry (dio) Levashov
+ */
+elFinder.prototype.commands.copy = function() {
+	"use strict";
+	this.shortcuts = [{
+		pattern     : 'ctrl+c ctrl+insert'
+	}];
+	
+	this.getstate = function(select) {
+		var sel = this.files(select),
+			cnt = sel.length,
+			filter = function(files) {
+				var fres = true;
+				return $.grep(files, function(f) {
+					fres = fres && f.read ? true : false;
+					return fres;
+				});
+			};
+
+		return cnt && filter(sel).length == cnt ? 0 : -1;
+	};
+	
+	this.exec = function(hashes) {
+		var fm   = this.fm,
+			dfrd = $.Deferred()
+				.fail(function(error) {
+					fm.error(error);
+				});
+
+		$.each(this.files(hashes), function(i, file) {
+			if (! file.read) {
+				return !dfrd.reject(['errCopy', file.name, 'errPerm']);
+			}
+		});
+		
+		return dfrd.state() == 'rejected' ? dfrd : dfrd.resolve(fm.clipboard(this.hashes(hashes)));
+	};
+
+};