1 files changed, 101 insertions, 0 deletions
diff --git a/packages/instant/src/components/timed_progress_bar.tsx b/packages/instant/src/components/timed_progress_bar.tsx
new file mode 100644
index 000000000..7fdfe1a25
--- /dev/null
+++ b/packages/instant/src/components/timed_progress_bar.tsx
@@ -0,0 +1,101 @@
+import * as _ from 'lodash';
+import * as React from 'react';
+import { Keyframes } from 'styled-components';
+
+import { PROGRESS_FINISH_ANIMATION_TIME_MS, PROGRESS_STALL_AT_PERCENTAGE } from '../constants';
+import { ColorOption, keyframes, styled } from '../style/theme';
+import { timeUtil } from '../util/time';
+
+import { Container } from './ui/container';
+import { Flex } from './ui/flex';
+import { Text } from './ui/text';
+
+export interface TimedProgressBarProps {
+    expectedTimeMs: number;
+    ended: boolean;
+}
+
+interface TimedProgressBarState {
+    animationTimeMs: number;
+    animationStartingWidth: string;
+    maxWidthPercent: number;
+}
+
+export const beginningState = (props: TimedProgressBarProps): TimedProgressBarState => {
+    return {
+        animationTimeMs: props.expectedTimeMs,
+        animationStartingWidth: '0%',
+        maxWidthPercent: PROGRESS_STALL_AT_PERCENTAGE,
+    };
+};
+
+export class TimedProgressBar extends React.Component<TimedProgressBarProps, TimedProgressBarState> {
+    private readonly _barRef = React.createRef<HTMLDivElement>();
+
+    public constructor(props: TimedProgressBarProps) {
+        super(props);
+        this.state = beginningState(props);
+    }
+
+    public componentDidUpdate(prevProps: TimedProgressBarProps, prevState: TimedProgressBarState): void {
+        if (prevProps.ended === false && this.props.ended === true) {
+            // Show nice animation going to end
+            // barRef current should always exist, but checking for typesafety
+            if (this._barRef.current) {
+                const curProgressWidth = this._barRef.current.offsetWidth;
+                this.setState({
+                    animationTimeMs: PROGRESS_FINISH_ANIMATION_TIME_MS,
+                    animationStartingWidth: `${curProgressWidth}px`,
+                    maxWidthPercent: 100,
+                });
+            }
+            return;
+        }
+
+        if (prevProps.expectedTimeMs !== this.props.expectedTimeMs || prevProps.ended !== this.props.ended) {
+            // things changed, get fresh state
+            this.setState(beginningState(this.props));
+        }
+    }
+
+    public render(): React.ReactNode {
+        return (
+            <Container width="100%" backgroundColor={ColorOption.lightGrey} borderRadius="6px">
+                <TimedProgress
+                    fromWidth={this.state.animationStartingWidth}
+                    timeMs={this.state.animationTimeMs}
+                    maxWidthPercent={this.state.maxWidthPercent}
+                    ref={this._barRef as any}
+                />
+            </Container>
+        );
+    }
+}
+
+const expandingWidthKeyframes = (fromWidth: string, maxWidthPercent: number) => {
+    return keyframes`
+          from {
+              width: ${fromWidth}
+          }
+          to {
+              width: ${maxWidthPercent}%;
+          }
+      `;
+};
+
+interface TimedProgressProps {
+    timeMs: number;
+    fromWidth: string;
+    maxWidthPercent: number;
+}
+// TODO use PrimaryColor instead of black
+export const TimedProgress =
+    styled.div <
+    TimedProgressProps >
+    `
+    background-color: black;
+    border-radius: 6px;
+    height: 6px;
+    animation: ${props => expandingWidthKeyframes(props.fromWidth, props.maxWidthPercent)}
+      ${props => props.timeMs}ms linear 1 forwards;
+  `;