gojs/extensionsJSM/TextEditorRadioButtons.ts

/*
*  Copyright (C) 1998-2021 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 menu, using HTML radio inputs and HTMLInfo.
// This file exposes one instance of HTMLInfo, window.TextEditorRadioButtons
// see /samples/customTextEditingTool.html
// see also textEditorSelectBox.js for another custom editor
// see also textEditor.html for a re-implementation of the default text editor
((window: any) => {
  // Use the following HTML:
  const customText = document.createElement('div');
  customText.id = 'customTextEditor';
  customText.style.cssText = 'border: 1px solid black; background-color: white;';
  customText.innerHTML =
    '  <label for="One">One</label> <input type="radio" name="group1" id="One" value="One"> <br/>' +
    '  <label for="Two">Two</label> <input type="radio" name="group1" id="Two" value="Two"> <br/>' +
    '  <label for="Three">Three</label> <input type="radio" name="group1" id="Three" value="Three"> <br/>' +
    '  <label for="Four">Four</label> <input type="radio" name="group1" id="Four" value="Four">';

  const customEditor = new go.HTMLInfo();

  customEditor.show = (textBlock, diagram, tool) => {
    if (!(textBlock instanceof go.TextBlock)) return;
    const startingValue = textBlock.text;

    // Populate the select box:
    customText.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'];
    let l = list.length;
    for (let i = 0; i < l; i++) {
      const value = list[i];
      const label = document.createElement('label');
      const input = document.createElement('input');
      label.htmlFor = value;
      label.textContent = value;
      input.type = 'radio';
      input.name = 'group1';
      input.id = value;
      input.value = value;
      customText.appendChild(label);
      customText.appendChild(input);
      if (i !== l - 1) customText.appendChild(document.createElement('br'));
    }

    // consider also adding the current value, if it is not in the choices list

    const children = customText.children;
    l = children.length;
    for (let i = 0; i < l; i++) {
      const child = children[i];
      if (!(child instanceof HTMLInputElement)) continue;
      // Make sure the radio button that equals the text is checked
      if (child.value === startingValue) {
        child.checked = true;
      }

      // Finish immediately when a radio button is pressed
      customText.addEventListener('change', (e) => {
        (tool as any).acceptText(go.TextEditingTool.Tab);
      }, false);

    }

    // Do a few different things when a user presses a key
    customText.addEventListener('keydown', (e) => {
      const key = e.key;
      if (key === "Enter") { // Accept on Enter
        (tool as any).acceptText(go.TextEditingTool.Enter);
        return;
      } else if (key === "Tab") { // Accept on Tab
        (tool as any).acceptText(go.TextEditingTool.Tab);
        e.preventDefault();
        return false;
      } else if (key === "Escape") { // Cancel on Esc
        tool.doCancel();
        if (tool.diagram) tool.diagram.focus();
      }
    }, false);

    const loc = textBlock.getDocumentPoint(go.Spot.TopLeft);
    const pos = diagram.transformDocToView(loc);
    customText.style.left = pos.x + 'px';
    customText.style.top = pos.y + 'px';
    customText.style.position = 'absolute';
    customText.style.zIndex = (100).toString(); // place it in front of the Diagram
    if (diagram.div !== null) diagram.div.appendChild(customText);
  };

  customEditor.hide = (diagram, tool) => {
    if (diagram.div !== null) diagram.div.removeChild(customText);
  };

  // customText is a div and doesn't have a "value" field
  // So we will make value into a function that will return
  // the "value" of the checked radio button
  customEditor.valueFunction = () => {
    const children = customText.children;
    const l = children.length;
    for (let i = 0; i < l; i++) {
      const child = children[i];
      if (!(child instanceof HTMLInputElement)) continue;
      if (child.checked) {
        return child.value;
      }
    }
    return '';
  };

  window.TextEditorRadioButtons = customEditor;
})(window);