source: Dev/trunk/src/client/dijit/_editor/plugins/Print.js

define([
        "dojo/_base/declare", // declare
        "dojo/i18n", // i18n.getLocalization
        "dojo/_base/lang", // lang.hitch
        "dojo/sniff", // has("chrome") has("opera")
        "../../focus", // focus.focus()
        "../_Plugin",
        "../../form/Button",
        "dojo/i18n!../nls/commands"
], function(declare, i18n, lang, has, focus, _Plugin, Button){

        // module:
        //              dijit/_editor/plugins/Print

        var Print = declare("dijit._editor.plugins.Print", _Plugin, {
                // summary:
                //              This plugin provides Print capability to the editor.  When
                //              clicked, the document in the editor frame will be printed.

                _initButton: function(){
                        // summary:
                        //              Over-ride for creation of the Print button.
                        var strings = i18n.getLocalization("dijit._editor", "commands"),
                                editor = this.editor;
                        this.button = new Button({
                                label: strings["print"],
                                ownerDocument: editor.ownerDocument,
                                dir: editor.dir,
                                lang: editor.lang,
                                showLabel: false,
                                iconClass: this.iconClassPrefix + " " + this.iconClassPrefix + "Print",
                                tabIndex: "-1",
                                onClick: lang.hitch(this, "_print")
                        });
                },

                setEditor: function(/*dijit/Editor*/ editor){
                        // summary:
                        //              Tell the plugin which Editor it is associated with.
                        // editor: Object
                        //              The editor object to attach the print capability to.
                        this.editor = editor;
                        this._initButton();

                        // Set up a check that we have a print function
                        // and disable button if we do not.
                        this.editor.onLoadDeferred.then(
                                lang.hitch(this, function(){
                                        if(!this.editor.iframe.contentWindow["print"]){
                                                this.button.set("disabled", true);
                                        }
                                })
                        );
                },

                updateState: function(){
                        // summary:
                        //              Over-ride for button state control for disabled to work.
                        var disabled = this.get("disabled");
                        if(!this.editor.iframe.contentWindow["print"]){
                                disabled = true;
                        }
                        this.button.set("disabled", disabled);
                },

                _print: function(){
                        // summary:
                        //              Function to trigger printing of the editor document
                        // tags:
                        //              private
                        var edFrame = this.editor.iframe;
                        if(edFrame.contentWindow["print"]){
                                // IE requires the frame to be focused for
                                // print to work, but since this is okay for all
                                // no special casing.
                                if(!has("opera") && !has("chrome")){
                                        focus.focus(edFrame);
                                        edFrame.contentWindow.print();
                                }else{
                                        // Neither Opera nor Chrome 3 et you print single frames.
                                        // So, open a new 'window', print it, and close it.
                                        // Also, can't use size 0x0, have to use 1x1
                                        var edDoc = this.editor.document;
                                        var content = this.editor.get("value");
                                        content = "<html><head><meta http-equiv='Content-Type' " +
                                                "content='text/html; charset='UTF-8'></head><body>" +
                                                content + "</body></html>";
                                        var win = window.open("javascript: ''",
                                                "",
                                                "status=0,menubar=0,location=0,toolbar=0," +
                                                        "width=1,height=1,resizable=0,scrollbars=0");
                                        win.document.open();
                                        win.document.write(content);
                                        win.document.close();

                                        var styleNodes = edDoc.getElementsByTagName("style");
                                        if(styleNodes){
                                                // Clone over any editor view styles, since we can't print the iframe
                                                // directly.
                                                var i;
                                                for(i = 0; i < styleNodes.length; i++){
                                                        var style = styleNodes[i].innerHTML;
                                                        var sNode = win.document.createElement("style");
                                                        sNode.appendChild(win.document.createTextNode(style));
                                                        win.document.getElementsByTagName("head")[0].appendChild(sNode);
                                                }
                                        }
                                        win.print();
                                        win.close();
                                }
                        }
                }
        });

        // Register this plugin.
        _Plugin.registry["print"] = function(){
                return new Print({command: "print"});
        };

        return Print;
});