gojs/extensionsJSM/TextEditorSelectBox.js

Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams

/*
*  Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved.
*/
/*
* This is an extension and not part of the main GoJS library.
* Note that the API for this class may change with any version, even point releases.
* If you intend to use an extension in production, you should copy the code to your own source directory.
* Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
*/
import * as go from '../release/go-module.js';
// HTML + JavaScript text editor using an HTML Select Element and HTMLInfo.
// This file exposes one instance of HTMLInfo, window.TextEditorSelectBox
// see /samples/customTextEditingTool.html
// see also textEditorRadioButton.js for another custom editor
// see also textEditor.html for a re-implementation of the default text editor
((window) => {
    const customEditor = new go.HTMLInfo();
    const customSelectBox = document.createElement('select');
    customEditor.show = (textBlock, diagram, tool) => {
        if (!(textBlock instanceof go.TextBlock))
            return;
        // Populate the select box:
        customSelectBox.innerHTML = '';
        let list = textBlock.choices;
        // Perhaps give some default choices if textBlock.choices is null
        if (list === null)
            list = ['Default A', 'Default B', 'Default C'];
        const l = list.length;
        for (let i = 0; i < l; i++) {
            const op = document.createElement('option');
            op.text = list[i];
            op.value = list[i];
            customSelectBox.add(op);
            // consider also adding the current value, if it is not in the choices list
        }
        // After the list is populated, set the value:
        customSelectBox.value = textBlock.text;
        // Do a few different things when a user presses a key
        customSelectBox.addEventListener('keydown', (e) => {
            const keynum = e.which;
            if (keynum === 13) { // Accept on Enter
                tool.acceptText(go.TextEditingTool.Enter);
                return;
            }
            else if (keynum === 9) { // Accept on Tab
                tool.acceptText(go.TextEditingTool.Tab);
                e.preventDefault();
                return false;
            }
            else if (keynum === 27) { // Cancel on Esc
                tool.doCancel();
                if (tool.diagram)
                    tool.diagram.focus();
            }
        }, false);
        const loc = textBlock.getDocumentPoint(go.Spot.TopLeft);
        const pos = diagram.transformDocToView(loc);
        customSelectBox.style.left = pos.x + 'px';
        customSelectBox.style.top = pos.y + 'px';
        customSelectBox.style.position = 'absolute';
        customSelectBox.style.zIndex = (100).toString(); // place it in front of the Diagram
        if (diagram.div !== null)
            diagram.div.appendChild(customSelectBox);
    };
    customEditor.hide = (diagram, tool) => {
        if (diagram.div !== null)
            diagram.div.removeChild(customSelectBox);
    };
    customEditor.valueFunction = () => customSelectBox.value;
    window.TextEditorSelectBox = customEditor;
})(window);