Modify checkboxes so that they can be indeterminate

To add the third state, we create our own checkboxes using font awesome
icons.

scm-ui/ui-components/src/Icon.tsx

@@ -30,6 +30,7 @@ type Props = {
   name: string;
   color: string;
   className?: string;
+  onClick?: () => void;
 };
 
 export default class Icon extends React.Component<Props> {
@@ -39,12 +40,12 @@ export default class Icon extends React.Component<Props> {
   };
 
   render() {
-    const { title, iconStyle, name, color, className } = this.props;
+    const { title, iconStyle, name, color, className, onClick } = this.props;
     if (title) {
       return (
-        <i title={title} className={classNames(iconStyle, "fa-fw", "fa-" + name, `has-text-${color}`, className)} />
+        <i onClick={onClick} title={title} className={classNames(iconStyle, "fa-fw", "fa-" + name, `has-text-${color}`, className)} />
       );
     }
-    return <i className={classNames(iconStyle, "fa-" + name, `has-text-${color}`, className)} />;
+    return <i onClick={onClick} className={classNames(iconStyle, "fa-" + name, `has-text-${color}`, className)} />;
   }
 }

scm-ui/ui-components/src/__snapshots__/storyshots.test.ts.snap

@@ -38182,14 +38182,13 @@ exports[`Storyshots Forms|Checkbox Default 1`] = `
   >
     <div
       className="control"
+      onClick={[Function]}
     >
       <label
         className="checkbox"
       >
-        <input
-          checked={false}
-          onChange={[Function]}
-          type="checkbox"
+        <i
+          className="is-outlined fa-square has-text-black far"
         />
          
         Not checked
@@ -38201,20 +38200,37 @@ exports[`Storyshots Forms|Checkbox Default 1`] = `
   >
     <div
       className="control"
+      onClick={[Function]}
     >
       <label
         className="checkbox"
       >
-        <input
-          checked={true}
-          onChange={[Function]}
-          type="checkbox"
+        <i
+          className="is-outlined fa-check-square has-text-blue fa"
         />
          
         Checked
       </label>
     </div>
   </div>
+  <div
+    className="field"
+  >
+    <div
+      className="control"
+      onClick={[Function]}
+    >
+      <label
+        className="checkbox"
+      >
+        <i
+          className="is-outlined fa-minus-square has-text-blue far"
+        />
+         
+        Indeterminate
+      </label>
+    </div>
+  </div>
 </div>
 `;
 
@@ -38227,16 +38243,14 @@ exports[`Storyshots Forms|Checkbox Disabled 1`] = `
   >
     <div
       className="control"
+      onClick={[Function]}
     >
       <label
         className="checkbox"
         disabled={true}
       >
-        <input
-          checked={true}
-          disabled={true}
-          onChange={[Function]}
-          type="checkbox"
+        <i
+          className="is-outlined fa-check-square has-text-grey-light fa"
         />
          
         Checked but disabled

scm-ui/ui-components/src/forms/Checkbox.stories.tsx

@@ -35,6 +35,7 @@ storiesOf("Forms|Checkbox", module)
     <Spacing>
       <Checkbox label="Not checked" checked={false} />
       <Checkbox label="Checked" checked={true} />
+      <Checkbox label="Indeterminate" checked={true} indeterminate={true} />
     </Spacing>
   ))
   .add("Disabled", () => (

scm-ui/ui-components/src/forms/Checkbox.tsx

@@ -24,11 +24,13 @@
 import React, { ChangeEvent } from "react";
 import { Help } from "../index";
 import LabelWithHelpIcon from "./LabelWithHelpIcon";
+import TriStateCheckbox from "./TriStateCheckbox";
 
 type Props = {
   label?: string;
   onChange?: (value: boolean, name?: string) => void;
   checked: boolean;
+  indeterminate?: boolean;
   name?: string;
   title?: string;
   disabled?: boolean;
@@ -36,9 +38,9 @@ type Props = {
 };
 
 export default class Checkbox extends React.Component<Props> {
-  onCheckboxChange = (event: ChangeEvent<HTMLInputElement>) => {
+  onCheckboxChange = () => {
     if (this.props.onChange) {
-      this.props.onChange(event.target.checked, this.props.name);
+      this.props.onChange(!this.props.checked, this.props.name);
     }
   };
 
@@ -57,18 +59,19 @@ export default class Checkbox extends React.Component<Props> {
   };
 
   render() {
-    const { label, checked, disabled } = this.props;
+    const { label, checked, indeterminate, disabled } = this.props;
     return (
       <div className="field">
         {this.renderLabelWithHelp()}
-        <div className="control">
+        <div className="control" onClick={this.onCheckboxChange}>
           {/*
             we have to ignore the next line,
             because jsx label does not the custom disabled attribute
             but bulma does.
             // @ts-ignore */}
           <label className="checkbox" disabled={disabled}>
-            <input type="checkbox" checked={checked} onChange={this.onCheckboxChange} disabled={disabled} /> {label}
+            <TriStateCheckbox checked={checked} indeterminate={indeterminate} disabled={disabled} />
+            {label}
             {this.renderHelp()}
           </label>
         </div>

scm-ui/ui-components/src/forms/TriStateCheckbox.tsx

@@ -0,0 +1,72 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+import React, { FC } from "react";
+import Icon from "../Icon";
+
+type Props = {
+  onChange?: (value: boolean) => void;
+  checked: boolean;
+  indeterminate?: boolean;
+  disabled?: boolean;
+  label?: string;
+};
+
+const TriStateCheckbox: FC<Props> = ({ onChange, checked, indeterminate, disabled, label }) => {
+  const onCheckboxChange = () => {
+    if (onChange) {
+      console.log("clickediclick");
+      onChange(!checked);
+    }
+  };
+
+  let icon;
+  if (indeterminate) {
+    icon = "minus-square";
+  } else if (checked) {
+    icon = "check-square";
+  } else {
+    icon = "square";
+  }
+
+  let className;
+  if (!checked || indeterminate) {
+    className = "far";
+  } else {
+    className = "fa";
+  }
+
+  let color;
+  if (disabled) {
+    color = "grey-light";
+  } else if (checked || indeterminate) {
+    color = "blue";
+  } else {
+    color = "black";
+  }
+
+  return <><Icon iconStyle={"is-outlined"} name={icon} className={className} color={color} />{" "}
+  {label}</>;
+};
+
+export default TriStateCheckbox;