How to use the pilot/event.getDocumentX function in pilot

this.onMouseDown = function(e) {
        // if this click caused the editor to be focused ignore the click
        // for selection and cursor placement
        if (
            !this.browserFocus.isFocused()
            || new Date().getTime() - this.browserFocus.lastFocus < 20
            || !this.editor.isFocused()
        )
            return;
        
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);
        var pos = this.$getEventPosition(e);
        var editor = this.editor;
        var self = this;
        var selectionRange = editor.getSelectionRange();
        var selectionEmpty = selectionRange.isEmpty();
        var state = STATE_UNKNOWN;
        var inSelection = false;

        var button = event.getButton(e);
        if (button !== 0) {
            if (selectionEmpty) {
                editor.moveCursorToPosition(pos);
            }
            if(button == 2) {
                editor.textInput.onContextMenu({x: pageX, y: pageY}, selectionEmpty);

this.onMouseDown = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);
        
        var pos = this.$getEventPosition(e);
        
        var editor = this.editor;
        var self = this;
        var selectionRange = editor.getSelectionRange();
        var selectionEmpty = selectionRange.isEmpty();
        var inSelection = !editor.getReadOnly()
            && !selectionEmpty
            && selectionRange.contains(pos.row, pos.column);
        
        var state = STATE_UNKNOWN;
        
        // if this click caused the editor to be focused should not clear the
        // selection

var onMouseSelection = function(e) {
            mousePageX = event.getDocumentX(e);
            mousePageY = event.getDocumentY(e);
        };

this.onMouseDown = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);
        var pos = this.$getEventPosition(e);
        var editor = this.editor;
        var self = this;
        var selectionRange = editor.getSelectionRange();
        var selectionEmpty = selectionRange.isEmpty();
        var state = STATE_UNKNOWN;
        var inSelection = false;
    
        var button = event.getButton(e);
        if (button !== 0) {
            if (selectionEmpty) {
                editor.moveCursorToPosition(pos);
            }
            if(button == 2) {
                editor.textInput.onContextMenu({x: pageX, y: pageY}, selectionEmpty);

this.$getEventPosition = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);
        var pos = this.editor.renderer.screenToTextCoordinates(pageX, pageY);
        pos.row = Math.max(0, Math.min(pos.row, this.editor.session.getLength()-1));
        return pos;
    };

var onMouseSelection = function(e) {
            mousePageX = event.getDocumentX(e);
            mousePageY = event.getDocumentY(e);
        };

this.$onGutterClick = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);

        this._dispatchEvent("gutter" + e.type, {
            row: this.screenToTextCoordinates(pageX, pageY).row,
            htmlEvent: e
        });
    };

this.$onGutterClick = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);

        this._dispatchEvent("gutter" + e.type, {
            row: this.screenToTextCoordinates(pageX, pageY).row,
            htmlEvent: e
        });
    };

this.$onGutterClick = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);

        this._dispatchEvent("gutter" + e.type, {
            row: this.screenToTextCoordinates(pageX, pageY).row,
            htmlEvent: e
        });
    };

this.$getEventPosition = function(e) {
        var pageX = event.getDocumentX(e);
        var pageY = event.getDocumentY(e);
        var pos = this.editor.renderer.screenToTextCoordinates(pageX, pageY);
        pos.row = Math.max(0, Math.min(pos.row, this.editor.session.getLength()-1));
        return pos;
    };