443 lines
15 KiB
JavaScript
443 lines
15 KiB
JavaScript
entry_titles = {} // map from entry title to the open editor for that entry
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function Editor( id, entry_text, insert_after_iframe_id, read_write, startup, highlight, focus ) {
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this.initial_text = entry_text;
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this.id = id;
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this.read_write = read_write;
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this.startup = startup || false; // whether this Editor is for a startup entry
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this.init_highlight = highlight || false;
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this.init_focus = focus || false;
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var iframe_id = "entry_" + id;
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var self = this;
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this.document = null;
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this.iframe = createDOM( "iframe", {
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"src": "/notebooks/blank_entry/" + id,
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"frameBorder": "0",
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"scrolling": "no",
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"id": iframe_id,
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"name": iframe_id,
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"class": "entry_frame"
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} );
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this.iframe.editor = this;
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this.title = null;
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if ( read_write ) {
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this.delete_button = createDOM( "input", {
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"type": "button",
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"class": "entry_button",
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"id": "delete_" + iframe_id,
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"value": "delete",
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"title": "delete entry [ctrl-d]"
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} );
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connect( this.delete_button, "onclick", function ( event ) { signal( self, "delete_clicked", event ); } );
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this.options_button = createDOM( "input", {
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"type": "button",
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"class": "entry_button",
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"id": "options_" + iframe_id,
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"value": "options",
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"title": "entry options"
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} );
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connect( this.options_button, "onclick", function ( event ) { signal( self, "options_clicked", event ); } );
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}
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if ( read_write || !startup ) {
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this.hide_button = createDOM( "input", {
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"type": "button",
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"class": "entry_button",
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"id": "hide_" + iframe_id,
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"value": "hide",
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"title": "hide entry [ctrl-h]"
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} );
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connect( this.hide_button, "onclick", function ( event ) { signal( self, "hide_clicked", event ); } );
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}
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this.entry_controls = createDOM( "span", { "class": "entry_controls" },
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this.delete_button ? this.delete_button : null,
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this.delete_button ? " " : null,
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this.options_button ? this.options_button : null,
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this.options_button ? " " : null,
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this.hide_button ? this.hide_button : null
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);
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// if an iframe has been given to insert this new editor after, then insert the new editor's
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// iframe. otherwise just append the iframe for the new editor
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if ( insert_after_iframe_id ) {
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insertSiblingNodesAfter( insert_after_iframe_id, this.entry_controls );
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insertSiblingNodesAfter( this.entry_controls, this.iframe );
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} else {
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appendChildNodes( "entries", this.entry_controls );
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appendChildNodes( "entries", this.iframe );
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}
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}
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// second stage of construction, invoked by the iframe's body onload handler. do not call directly.
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// four-stage construction is only necessary because IE is such a piece of shit
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function editor_loaded( id ) {
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var iframe = getElement( "entry_" + id );
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setTimeout( function () { iframe.editor.init_document(); }, 1 );
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}
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// third stage of construction, invoked by the editor_loaded() function. do not call directly
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Editor.prototype.init_document = function () {
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var self = this; // necessary so that the member functions of this editor object are used
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if ( this.iframe.contentDocument ) { // browsers such as Firefox
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this.document = this.iframe.contentDocument;
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if ( this.read_write ) {
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this.document.designMode = "On";
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}
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setTimeout( function () { self.finish_init(); }, 1 );
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} else { // browsers such as IE
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this.document = this.iframe.contentWindow.document;
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if ( this.read_write ) {
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this.document.designMode = "On";
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// work-around for IE bug: reget the document after designMode is turned on
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this.document = this.iframe.contentWindow.document;
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}
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setTimeout( function () { self.finish_init(); }, 100 );
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}
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}
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// fourth and final stage of construction, invoked by init_document(). do not call directly
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Editor.prototype.finish_init = function () {
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if ( !this.initial_text )
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this.initial_text = "<h3>";
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this.insert_html( this.initial_text );
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var self = this; // necessary so that the member functions of this editor object are used
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if ( this.read_write ) {
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connect( this.document, "onkeydown", function ( event ) { self.key_pressed( event ); } );
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connect( this.document, "onkeyup", function ( event ) { self.key_released( event ); } );
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}
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connect( this.document, "onclick", function ( event ) { self.mouse_clicked( event ); } );
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connect( this.document, "onblur", function ( event ) { self.blurred( event ); } );
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connect( this.document, "onfocus", function ( event ) { self.focused( event ); } );
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connect( this.document.body, "onblur", function ( event ) { self.blurred( event ); } );
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connect( this.document.body, "onfocus", function ( event ) { self.focused( event ); } );
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// special-case: connect any submit buttons within the contents of this entry
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var signup_button = withDocument( this.document, function () { return getElement( "signup_button" ); } );
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if ( signup_button ) {
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var signup_form = withDocument( this.document, function () { return getElement( "signup_form" ); } );
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connect( signup_button, "onclick", function ( event ) {
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signal( self, "submit_form", "/users/signup", signup_form ); event.stop();
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} );
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}
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var login_button = withDocument( this.document, function () { return getElement( "login_button" ); } );
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if ( login_button ) {
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var login_form = withDocument( this.document, function () { return getElement( "login_form" ); } );
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connect( login_button, "onclick", function ( event ) {
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signal( self, "submit_form", "/users/login", login_form ); event.stop();
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} );
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}
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if ( this.iframe.contentDocument ) { // browsers such as Firefox
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if ( this.read_write ) this.exec_command( "styleWithCSS", false );
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this.resize();
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if ( this.init_highlight ) self.highlight();
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} else { // browsers such as IE, which won't resize correctly if done too soon
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setTimeout( function () {
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self.resize();
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if ( self.init_highlight ) self.highlight();
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}, 50 );
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}
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this.scrape_title();
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if ( this.init_focus )
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this.focus();
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signal( this, "state_changed", this );
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}
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Editor.prototype.highlight = function ( scroll ) {
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if ( scroll == undefined )
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scroll = true;
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if ( /Opera/.test( navigator.userAgent ) ) { // MochiKit's Highlight is broken in Opera
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if ( scroll ) ScrollTo( this.iframe );
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pulsate( this.iframe, options = { "pulses": 1, "duration": 0.5 } );
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} else if ( this.iframe.contentDocument ) { // browsers such as Firefox
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if ( scroll ) ScrollTo( this.iframe );
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Highlight( this.iframe, options = { "queue": { "scope": "highlight", "limit": 1 } } );
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} else { // browsers such as IE
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if ( scroll ) ScrollTo( this.iframe );
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if ( this.document && this.document.body )
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Highlight( this.document.body, options = { "queue": { "scope": "highlight", "limit": 1 } } );
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}
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}
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Editor.prototype.exec_command = function ( command, parameter ) {
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command = command.toLowerCase();
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if ( command == "h3" ) {
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if ( this.state_enabled( "h3" ) )
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this.document.execCommand( "formatblock", false, "normal" );
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else
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this.document.execCommand( "formatblock", false, "<h3>" );
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return;
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}
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this.document.execCommand( command, false, parameter );
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}
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Editor.prototype.insert_html = function ( html ) {
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if ( html.length == 0 ) return;
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if ( !this.read_write ) {
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this.document.body.innerHTML = html;
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return;
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}
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try { // browsers supporting insertHTML command, such as Firefox
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this.document.execCommand( "insertHTML", false, html );
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// for some reason, appending an empty span improves formatting
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spans = getElementsByTagAndClassName( "span", null, parent = this.document );
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if ( spans.length == 0 ) {
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var span = this.document.createElement( "span" );
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this.document.body.appendChild( span );
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}
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} catch ( e ) { // browsers that don't support insertHTML, such as IE
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this.document.body.innerHTML = html;
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}
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}
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// resize the editor's frame to fit the dimensions of its content
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Editor.prototype.resize = function () {
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var dimensions;
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// TODO: find a better way to determine which dimensions to use than just checking for contentDocument
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if ( this.iframe.contentDocument ) // Firefox
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dimensions = { "h": elementDimensions( this.document.documentElement ).h };
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else // IE
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dimensions = { "h": this.document.body.scrollHeight };
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setElementDimensions( this.iframe, dimensions );
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}
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Editor.prototype.key_pressed = function ( event ) {
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signal( this, "key_pressed", this, event );
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this.resize();
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}
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Editor.prototype.key_released = function ( event ) {
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this.resize();
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// if non-alphabetic (a-z), non-ctrl keys are released, issue a state changed event
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var code = event.key().code;
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if ( ( code >= 65 && code <= 90 ) || event.modifier().ctrl )
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return;
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signal( this, "state_changed", this );
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}
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Editor.prototype.mouse_clicked = function ( event ) {
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event.stop();
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signal( this, "state_changed", this );
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// search through the tree of elements containing the clicked target. if a link isn't found, bail
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var link = event.target()
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while ( link.nodeName != "A" ) {
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link = link.parentNode;
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if ( !link )
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return;
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}
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if ( !link.href )
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return;
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// in case the link is to ourself, first grab the most recent version of our title
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this.scrape_title();
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var id;
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var link_title = scrapeText( link );
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var editor = entry_titles[ link_title ];
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var href_leaf = link.href.split( "/" ).pop();
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// if the link's title corresponds to an open entry id, set that as the link's destination
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if ( editor ) {
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id = editor.id;
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link.href = "/entries/" + id;
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// if this is a new link, get a new entry id and set it for the link's destination
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} else if ( href_leaf == "new" ) {
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signal( this, "load_editor_by_title", link_title, this.iframe.id );
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return;
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// otherwise, use the id from link's current destination
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} else {
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// the last part of the current link's href is the entry id
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id = href_leaf;
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}
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// find the entry corresponding to the linked id, or create a new entry
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var iframe = getElement( "entry_" + id );
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if ( iframe ) {
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iframe.editor.highlight();
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return;
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}
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signal( this, "load_editor", link_title, this.iframe.id, id );
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}
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Editor.prototype.scrape_title = function () {
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// scrape the entry title out of the editor
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var heading = getFirstElementByTagAndClassName( "h3", null, this.document );
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if ( !heading ) return;
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var title = scrapeText( heading );
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// delete the previous title (if any) from the entry_titles map
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if ( this.title )
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delete entry_titles[ this.title ];
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// record the new title in entry_titles
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this.title = title;
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entry_titles[ this.title ] = this;
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}
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Editor.prototype.focused = function () {
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signal( this, "focused", this );
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}
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Editor.prototype.blurred = function () {
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this.scrape_title();
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}
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Editor.prototype.empty = function () {
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if ( !this.document.body )
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return false; // we don't know yet whether it's empty
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return ( scrapeText( this.document.body ).length == 0 );
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}
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Editor.prototype.start_link = function () {
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// get the current selection, which is the link title
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if ( this.iframe.contentWindow && this.iframe.contentWindow.getSelection ) { // browsers such as Firefox
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var selection = this.iframe.contentWindow.getSelection();
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// if no text is selected, then insert a link with a placeholder nbsp as the link title, and
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// then immediately remove the link title once the link is created
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if ( selection.toString().length == 0 ) {
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this.insert_html( " " );
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var range = selection.getRangeAt( 0 );
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var container = range.startContainer;
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range.setStart( container, range.startOffset - 1 );
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this.exec_command( "createLink", "/entries/new" );
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container.nodeValue = "";
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selection.collapse( container, 0 );
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// otherwise, just create a link with the selected text as the link title
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} else {
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this.exec_command( "createLink", "/entries/new" );
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}
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} else if ( this.document.selection ) { // browsers such as IE
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var range = this.document.selection.createRange();
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// if no text is selected, then insert a link with a placeholder space as the link title, and
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// then select it
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if ( range.text.length == 0 ) {
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range.text = " ";
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range.moveStart( "character", -1 );
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range.select();
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}
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this.exec_command( "createLink", "/entries/new" );
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}
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}
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Editor.prototype.end_link = function () {
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if ( this.iframe.contentWindow && this.iframe.contentWindow.getSelection ) { // browsers such as Firefox
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this.exec_command( "unlink" );
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} else if ( this.document.selection ) { // browsers such as IE
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// if some text is already selected, unlink it and bail
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var range = this.document.selection.createRange();
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if ( range.text.length > 0 ) {
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this.exec_command( "unlink" );
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return;
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}
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// since execCommand() with "unlink" removes the entire link instead of just ending it, fake it
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// by appending a temporary span, selecting it, and then immediately removing it
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var span = this.document.createElement( "span" );
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span.innerHTML = " ";
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range.parentElement().parentNode.appendChild( span );
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range.moveToElementText( span );
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range.select();
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range.pasteHTML( "" );
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}
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}
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Editor.prototype.focus = function () {
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if ( /Opera/.test( navigator.userAgent ) )
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this.iframe.focus();
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else
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this.iframe.contentWindow.focus();
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}
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// return true if the specified state is enabled
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Editor.prototype.state_enabled = function ( state_name ) {
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state_name = state_name.toLowerCase();
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var format_block = this.document.queryCommandValue( "formatblock" ).toLowerCase();
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var heading = ( format_block == "h3" || format_block == "heading 3" );
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if ( state_name == "h3" )
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return heading;
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if ( state_name == "bold" && heading )
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return false;
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// to determine if we're within a link, see whether the current selection is contained (directly
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// or indirectly) by an "A" node
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if ( state_name == "createlink" ) {
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var link;
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if ( window.getSelection ) { // browsers such as Firefox
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var selection = this.iframe.contentWindow.getSelection();
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var range = selection.getRangeAt( 0 );
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link = range.endContainer;
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} else if ( this.document.selection ) { // browsers such as IE
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var range = this.document.selection.createRange();
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link = range.parentElement();
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}
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while ( link.nodeName != "A" ) {
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link = link.parentNode;
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if ( !link )
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return false;
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}
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if ( !link.href )
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return false;
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return true;
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}
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return this.document.queryCommandState( state_name )
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}
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Editor.prototype.contents = function () {
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return this.document.body.innerHTML;
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}
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Editor.prototype.shutdown = function( event ) {
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if ( this.title )
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delete entry_titles[ this.title ];
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var iframe = this.iframe;
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var entry_controls = this.entry_controls;
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disconnectAll( this );
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disconnectAll( this.delete_button );
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disconnectAll( this.options_button );
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disconnectAll( this.hide_button );
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disconnectAll( iframe );
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disconnectAll( this.document.body );
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disconnectAll( this.document );
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blindUp( iframe, options = { "duration": 0.5, afterFinish: function () {
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try {
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removeElement( entry_controls );
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removeElement( iframe );
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} catch ( e ) { }
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} } );
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}
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