Add TypedText component and use it on landing page

2 files changed, 77 insertions, 0 deletions

diff --git a/packages/website/ts/components/ui/text.tsx b/packages/website/ts/components/ui/text.tsx
index 734483564..cd8f290e3 100644
--- a/packages/website/ts/components/ui/text.tsx
+++ b/packages/website/ts/components/ui/text.tsx
@@ -20,6 +20,7 @@ export interface TextProps {
     onClick?: (event: React.MouseEvent<HTMLElement>) => void;
     hoverColor?: string;
     noWrap?: boolean;
+    display?: string;
 }
 
 const PlainText: React.StatelessComponent<TextProps> = ({ children, className, onClick, Tag }) => (
@@ -41,6 +42,7 @@ export const Text = styled(PlainText)`
     ${props => (props.onClick ? 'cursor: pointer' : '')};
     transition: color 0.5s ease;
     ${props => (props.noWrap ? 'white-space: nowrap' : '')};
+    ${props => (props.display ? `display: ${props.display}` : '')};
     &:hover {
         ${props => (props.onClick ? `color: ${props.hoverColor || darken(0.3, props.fontColor)}` : '')};
     }
diff --git a/packages/website/ts/components/ui/typed_text.tsx b/packages/website/ts/components/ui/typed_text.tsx
new file mode 100644
index 000000000..a59309139
--- /dev/null
+++ b/packages/website/ts/components/ui/typed_text.tsx
@@ -0,0 +1,75 @@
+import * as _ from 'lodash';
+import { darken } from 'polished';
+import * as React from 'react';
+import Typist from 'react-typist';
+
+import { Text, TextProps } from 'ts/components/ui/text';
+
+import 'react-typist/dist/Typist.css';
+
+export interface TypedTextProps extends TextProps {
+    textList: string[];
+    shouldRepeat?: boolean;
+    wordDelayMs?: number;
+    avgKeystrokeDelayMs?: number;
+    stdKeystrokeDelay?: number;
+}
+
+export interface TypedTextState {
+    cycleCount: number;
+}
+
+export class TypedText extends React.Component<TypedTextProps, TypedTextState> {
+    public static defaultProps = {
+        shouldRepeat: false,
+        avgKeystrokeDelayMs: 90,
+        wordDelayMs: 1000,
+    };
+    public state = {
+        cycleCount: 0,
+    };
+    public render(): React.ReactNode {
+        const {
+            textList,
+            shouldRepeat,
+            wordDelayMs,
+            avgKeystrokeDelayMs,
+            stdKeystrokeDelay,
+            ...textProps
+        } = this.props;
+        const { cycleCount } = this.state;
+        if (_.isEmpty(textList)) {
+            return null;
+        }
+        const typistChildren: React.ReactNode[] = [];
+        _.forEach(textList, text => {
+            typistChildren.push(
+                <Text key={`text-${text}-${cycleCount}`} {...textProps}>
+                    {text}
+                </Text>,
+            );
+            if (wordDelayMs) {
+                typistChildren.push(<Typist.Delay key={`delay-${text}-${cycleCount}`} ms={wordDelayMs} />);
+            }
+            typistChildren.push(<Typist.Backspace key={`backspace-${text}-${cycleCount}`} count={text.length} />);
+        });
+        return (
+            <Typist
+                avgTypingDelay={avgKeystrokeDelayMs}
+                stdTypingDelay={stdKeystrokeDelay}
+                className="inline"
+                key={`typist-key-${cycleCount}`}
+                onTypingDone={this._onTypingDone.bind(this)}
+            >
+                {typistChildren}
+            </Typist>
+        );
+    }
+    private _onTypingDone(): void {
+        if (this.props.shouldRepeat) {
+            this.setState({
+                cycleCount: this.state.cycleCount + 1,
+            });
+        }
+    }
+}