From 6775f44e632bd99b1d1dd8e44a508c9a2990dc0b Mon Sep 17 00:00:00 2001
From: frozenhelium <fren.ankit@gmail.com>
Date: Fri, 13 Nov 2020 14:41:49 +0545
Subject: [PATCH] Add pending animation component

---
 src/components/Backdrop/index.tsx          | 15 ------
 src/components/Loading/index.tsx           | 47 +++++++++++++++++++
 src/components/Loading/styles.css          |  5 ++
 src/components/LoadingAnimation/index.tsx  | 41 ++++++++++++++++
 src/components/LoadingAnimation/styles.css | 54 ++++++++++++++++++++++
 src/components/RawButton/index.tsx         | 11 +++++
 src/components/RawButton/styles.css        |  6 +++
 src/index.tsx                              |  2 +
 src/stories/LoadingAnimation.stories.tsx   | 22 +++++++++
 src/styles.css                             |  8 +++-
 10 files changed, 194 insertions(+), 17 deletions(-)
 create mode 100644 src/components/Loading/index.tsx
 create mode 100644 src/components/Loading/styles.css
 create mode 100644 src/components/LoadingAnimation/index.tsx
 create mode 100644 src/components/LoadingAnimation/styles.css
 create mode 100644 src/stories/LoadingAnimation.stories.tsx

diff --git a/src/components/Backdrop/index.tsx b/src/components/Backdrop/index.tsx
index 9b6c724..8944213 100644
--- a/src/components/Backdrop/index.tsx
+++ b/src/components/Backdrop/index.tsx
@@ -8,7 +8,6 @@ import styles from './styles.css';
 
 export interface BackdropProps {
     className?: string;
-    parentRef?: React.RefObject<HTMLElement>;
     children?: React.ReactNode;
     uiMode?: UiMode;
 }
@@ -16,7 +15,6 @@ export interface BackdropProps {
 function Backdrop(props: BackdropProps) {
     const {
         className,
-        parentRef,
         children,
         uiMode,
     } = props;
@@ -24,19 +22,6 @@ function Backdrop(props: BackdropProps) {
     const ref = React.useRef<HTMLDivElement>(null);
     const themeClassName = useThemeClassName(uiMode, styles.light, styles.dark);
 
-    React.useLayoutEffect(
-        () => {
-            const {
-                current: el,
-            } = ref;
-            if (parentRef && parentRef.current && el) {
-                const parentBCR = parentRef.current.getBoundingClientRect();
-                el.style.width = `${parentBCR.width}px`;
-            }
-        },
-        [parentRef],
-    );
-
     return (
         <div
             ref={ref}
diff --git a/src/components/Loading/index.tsx b/src/components/Loading/index.tsx
new file mode 100644
index 0000000..90e0d33
--- /dev/null
+++ b/src/components/Loading/index.tsx
@@ -0,0 +1,47 @@
+import React from 'react';
+import { _cs } from '@togglecorp/fujs';
+
+import ThemeContext, { UiMode } from '../ThemeContext';
+
+import Backdrop from '../Backdrop';
+import LoadingAnimation from '../LoadingAnimation';
+
+import styles from './styles.css';
+
+export interface LoadingProps {
+    className?: string;
+    uiMode?: UiMode;
+    compact?: boolean;
+}
+
+const reverseUiMode: {
+    [key in UiMode]: UiMode;
+} = {
+    light: 'dark',
+    dark: 'light',
+};
+
+function Loading(props: LoadingProps) {
+    const { uiMode: defaultUiMode } = React.useContext(ThemeContext);
+    const {
+        className,
+        uiMode = defaultUiMode,
+        compact,
+    } = props;
+
+    // const themeClassName = useThemeClassName(uiMode, styles.light, styles.dark);
+
+    return (
+        <Backdrop
+            uiMode={reverseUiMode[uiMode]}
+            className={_cs(className, styles.loading)}
+        >
+            <LoadingAnimation
+                uiMode={uiMode}
+                compact={compact}
+            />
+        </Backdrop>
+    );
+}
+
+export default Loading;
diff --git a/src/components/Loading/styles.css b/src/components/Loading/styles.css
new file mode 100644
index 0000000..fc99f19
--- /dev/null
+++ b/src/components/Loading/styles.css
@@ -0,0 +1,5 @@
+.loading {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
diff --git a/src/components/LoadingAnimation/index.tsx b/src/components/LoadingAnimation/index.tsx
new file mode 100644
index 0000000..0c512ec
--- /dev/null
+++ b/src/components/LoadingAnimation/index.tsx
@@ -0,0 +1,41 @@
+import React from 'react';
+import { _cs } from '@togglecorp/fujs';
+
+import { UiMode } from '../ThemeContext';
+import { useThemeClassName } from '../../hooks';
+
+import styles from './styles.css';
+
+export interface LoadingAnimationProps {
+    className?: string;
+    uiMode?: UiMode;
+    compact?: boolean;
+}
+
+function LoadingAnimation(props: LoadingAnimationProps) {
+    const {
+        className,
+        uiMode,
+        compact,
+    } = props;
+
+    const themeClassName = useThemeClassName(uiMode, styles.light, styles.dark);
+
+    return (
+        <div className={
+            _cs(
+                className,
+                themeClassName,
+                styles.loadingAnimation,
+                compact && styles.compact,
+            )
+        }
+        >
+            <div className={styles.particle} />
+            <div className={styles.particle} />
+            <div className={styles.particle} />
+        </div>
+    );
+}
+
+export default LoadingAnimation;
diff --git a/src/components/LoadingAnimation/styles.css b/src/components/LoadingAnimation/styles.css
new file mode 100644
index 0000000..da88abb
--- /dev/null
+++ b/src/components/LoadingAnimation/styles.css
@@ -0,0 +1,54 @@
+.loading-animation {
+    --size: 0.4em;
+    --half-size: 0.2em;
+    --gap: 0.1em;
+    --color: transparent;
+    --transition-duration: 1s;
+
+    display: flex;
+    align-items: center;
+
+    &.compact {
+        --size: 0.24em;
+        --half-size: 0.12em;
+        --gap: 0.06em;
+    }
+
+    &.light {
+        --color: var(--tui-color-loading-particle-light);
+    }
+
+    &.dark {
+        --color: var(--tui-color-loading-particle-dark);
+    }
+
+    .particle {
+        flex-shrink: 0;
+        margin: var(--gap);
+        border-radius: 50%;
+        background-color: var(--color);
+        width: var(--size);
+        height: var(--size);
+        animation: wiggle-vertically var(--transition-duration) linear infinite;
+
+        &:nth-child(1) {
+            animation-delay: 0;
+        }
+
+        &:nth-child(2) {
+            animation-delay: calc(var(--transition-duration) / 3);
+        }
+
+        &:nth-child(3) {
+            animation-delay: calc(2 * var(--transition-duration) / 3);
+        }
+    }
+}
+
+@keyframes wiggle-vertically {
+    0% { transform: translateY(0); }
+    25% { transform: translateY(calc(-1 * var(--half-size))); }
+    75% { transform: translateY(calc(-1 * var(--half-size))); }
+    100% { transform: translateY(0); }
+}
+
diff --git a/src/components/RawButton/index.tsx b/src/components/RawButton/index.tsx
index 150c4dd..a72efc0 100644
--- a/src/components/RawButton/index.tsx
+++ b/src/components/RawButton/index.tsx
@@ -4,6 +4,7 @@ import { _cs } from '@togglecorp/fujs';
 import { UiMode } from '../ThemeContext';
 import { useThemeClassName } from '../../hooks';
 import VisualFeedback from '../VisualFeedback';
+import Loading from '../Loading';
 
 import styles from './styles.css';
 
@@ -23,6 +24,10 @@ export interface RawButtonProps<N extends number | string | undefined> extends O
     uiMode?: UiMode;
     name: N;
     elementRef?: React.Ref<HTMLButtonElement>;
+    /**
+     * Shows the loading animation
+     */
+    pending?: boolean;
 }
 
 /**
@@ -37,6 +42,7 @@ function RawButton<N extends number | string | undefined>(props: RawButtonProps<
         disabled,
         elementRef,
         name,
+        pending,
         ...otherProps
     } = props;
 
@@ -61,6 +67,11 @@ function RawButton<N extends number | string | undefined>(props: RawButtonProps<
             // eslint-disable-next-line react/jsx-props-no-spreading
             {...otherProps}
         >
+            {pending && (
+                <Loading
+                    uiMode={uiMode}
+                />
+            )}
             <VisualFeedback
                 disabled={disabled}
                 uiMode={uiMode}
diff --git a/src/components/RawButton/styles.css b/src/components/RawButton/styles.css
index c219455..3261a96 100644
--- a/src/components/RawButton/styles.css
+++ b/src/components/RawButton/styles.css
@@ -20,4 +20,10 @@
             outline-color: var(--tui-color-outline-dark);
         }
     }
+
+    &.loading-container {
+        position: absolute;
+        top: 0;
+        left: 0;
+    }
 }
diff --git a/src/index.tsx b/src/index.tsx
index 3441e0b..e2e04b9 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -26,6 +26,8 @@ export type { DateTimeInputProps } from './components/DateTimeInput';
 export { default as DateTimeInput } from './components/DateTimeInput';
 export type { ListProps } from './components/List';
 export { default as List } from './components/List';
+export type { LoadingAnimationProps } from './components/LoadingAnimation';
+export { default as LoadingAnimation } from './components/LoadingAnimation';
 export type { ModalProps } from './components/Modal';
 export { default as Modal } from './components/Modal';
 export type { MultiSelectInputProps } from './components/MultiSelectInput';
diff --git a/src/stories/LoadingAnimation.stories.tsx b/src/stories/LoadingAnimation.stories.tsx
new file mode 100644
index 0000000..33354a4
--- /dev/null
+++ b/src/stories/LoadingAnimation.stories.tsx
@@ -0,0 +1,22 @@
+import React from 'react';
+import { Story } from '@storybook/react/types-6-0';
+import LoadingAnimation, { LoadingAnimationProps } from '#components/LoadingAnimation';
+
+export default {
+    title: 'View/LoadingAnimation',
+    component: LoadingAnimation,
+    argTypes: {},
+};
+
+const Template: Story<LoadingAnimationProps> = (props) => (
+    <LoadingAnimation {...props} />
+);
+
+export const Default = Template.bind({});
+Default.args = {
+};
+
+export const Compact = Template.bind({});
+Compact.args = {
+    compact: true,
+};
diff --git a/src/styles.css b/src/styles.css
index c136693..8b08b12 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -107,8 +107,8 @@
 
     --tui-color-shadow: rgba(0, 0, 0, .5);
 
-    --tui-color-backdrop-light: rgba(0, 0, 0, .5);
-    --tui-color-backdrop-dark: rgba(255, 255, 255, .5);
+    --tui-color-backdrop-light: rgba(0, 0, 0, .6);
+    --tui-color-backdrop-dark: rgba(255, 255, 255, .7);
 
     --tui-color-background-switch-icon-light: rgba(0, 0, 0, .4);
     --tui-color-background-switch-icon-dark: rgba(255, 255, 255, .4);
@@ -129,4 +129,8 @@
     --tui-height-max-modal: 96vh;
     --tui-width-max-modal: 96vw;
     --tui-width-min-modal: 360px;
+
+
+    --tui-color-loading-particle-light: rgba(0, 0, 0, 1);
+    --tui-color-loading-particle-dark: rgba(255, 255, 255, 1);
 }