From 12b6877aeb0a6bcddab4193b62cd10347b8c328b Mon Sep 17 00:00:00 2001
From: Steve Klebanoff <steve.klebanoff@gmail.com>
Date: Thu, 18 Oct 2018 13:31:11 -0700
Subject: Pulsating holder element showing, even if amount is empty

---
 .../instant/src/components/amount_placeholder.tsx  |  29 ++++++
 .../instant/src/components/animations/pulse.tsx    |  15 +++
 .../instant/src/components/instant_heading.tsx     | 112 ++++++++++-----------
 packages/instant/src/components/ui/container.tsx   |   2 +
 4 files changed, 101 insertions(+), 57 deletions(-)
 create mode 100644 packages/instant/src/components/amount_placeholder.tsx
 create mode 100644 packages/instant/src/components/animations/pulse.tsx

(limited to 'packages/instant')

diff --git a/packages/instant/src/components/amount_placeholder.tsx b/packages/instant/src/components/amount_placeholder.tsx
new file mode 100644
index 000000000..54639effb
--- /dev/null
+++ b/packages/instant/src/components/amount_placeholder.tsx
@@ -0,0 +1,29 @@
+import * as React from 'react';
+
+import { ColorOption } from '../style/theme';
+
+import { Pulse } from './animations/pulse';
+
+import { Text } from './ui';
+
+export interface AmountPlaceholderProps {
+    pulsating: boolean;
+}
+
+const PlainPlaceholder = () => (
+    <Text fontWeight="bold" fontColor={ColorOption.white}>
+        &mdash;
+    </Text>
+);
+
+export const AmountPlaceholder: React.StatelessComponent<AmountPlaceholderProps> = props => {
+    if (props.pulsating) {
+        return (
+            <Pulse>
+                <PlainPlaceholder />
+            </Pulse>
+        );
+    } else {
+        return <PlainPlaceholder />;
+    }
+};
diff --git a/packages/instant/src/components/animations/pulse.tsx b/packages/instant/src/components/animations/pulse.tsx
new file mode 100644
index 000000000..01d6ea070
--- /dev/null
+++ b/packages/instant/src/components/animations/pulse.tsx
@@ -0,0 +1,15 @@
+import { keyframes, styled } from '../../style/theme';
+
+const pulsingKeyframes = keyframes`
+    0%, 100% {
+        opacity: 0.2;
+    }
+    50% {
+        opacity: 100;
+    }
+`;
+export const Pulse = styled.div`
+    animation-name: ${pulsingKeyframes}
+    animation-duration: 2s;
+    animation-iteration-count: infinite;
+`;
diff --git a/packages/instant/src/components/instant_heading.tsx b/packages/instant/src/components/instant_heading.tsx
index 9dd13299c..9ca4ce598 100644
--- a/packages/instant/src/components/instant_heading.tsx
+++ b/packages/instant/src/components/instant_heading.tsx
@@ -7,6 +7,7 @@ import { ColorOption } from '../style/theme';
 import { AsyncProcessState } from '../types';
 import { format } from '../util/format';
 
+import { AmountPlaceholder } from './amount_placeholder';
 import { Container, Flex, Text } from './ui';
 
 export interface InstantHeadingProps {
@@ -16,70 +17,67 @@ export interface InstantHeadingProps {
     quoteRequestState: AsyncProcessState;
 }
 
-const Placeholder = () => (
-    <Text fontWeight="bold" fontColor={ColorOption.white}>
-        &mdash;
-    </Text>
-);
-const displaytotalEthBaseAmount = ({
-    selectedAssetAmount,
-    totalEthBaseAmount,
-}: InstantHeadingProps): React.ReactNode => {
-    if (_.isUndefined(selectedAssetAmount)) {
-        return '0 ETH';
+export class InstantHeading extends React.Component<InstantHeadingProps, {}> {
+    public render(): React.ReactNode {
+        const placeholderAmountToAlwaysShow = this._placeholderAmountToAlwaysShow();
+        return (
+            <Container
+                backgroundColor={ColorOption.primaryColor}
+                padding="20px"
+                width="100%"
+                borderRadius="3px 3px 0px 0px"
+            >
+                <Container marginBottom="5px">
+                    <Text
+                        letterSpacing="1px"
+                        fontColor={ColorOption.white}
+                        opacity={0.7}
+                        fontWeight={500}
+                        textTransform="uppercase"
+                        fontSize="12px"
+                    >
+                        I want to buy
+                    </Text>
+                </Container>
+                <Flex direction="row" justify="space-between">
+                    <SelectedAssetAmountInput fontSize="45px" />
+                    <Flex direction="column" justify="space-between">
+                        <Container marginBottom="5px">{placeholderAmountToAlwaysShow || this._ethAmount()}</Container>
+                        <Container opacity={0.7}>{placeholderAmountToAlwaysShow || this._dollarAmount()}</Container>
+                    </Flex>
+                </Flex>
+            </Container>
+        );
     }
-    return format.ethBaseAmount(totalEthBaseAmount, 4, <Placeholder />);
-};
 
-const displayUsdAmount = ({
-    totalEthBaseAmount,
-    selectedAssetAmount,
-    ethUsdPrice,
-}: InstantHeadingProps): React.ReactNode => {
-    if (_.isUndefined(selectedAssetAmount)) {
-        return '$0.00';
+    private _placeholderAmountToAlwaysShow(): React.ReactNode | undefined {
+        if (this.props.quoteRequestState === AsyncProcessState.PENDING) {
+            return <AmountPlaceholder pulsating={true} />;
+        }
+        if (_.isUndefined(this.props.selectedAssetAmount)) {
+            return <AmountPlaceholder pulsating={false} />;
+        }
+        return undefined;
     }
-    return format.ethBaseAmountInUsd(totalEthBaseAmount, ethUsdPrice, 2, <Placeholder />);
-};
 
-const loadingOrAmount = (quoteRequestState: AsyncProcessState, amount: React.ReactNode): React.ReactNode => {
-    if (quoteRequestState === AsyncProcessState.PENDING) {
+    private _ethAmount(): React.ReactNode {
         return (
-            <Text fontWeight="bold" fontColor={ColorOption.white}>
-                &hellip;loading
+            <Text fontSize="16px" fontColor={ColorOption.white} fontWeight={500}>
+                {format.ethBaseAmount(this.props.totalEthBaseAmount, 4, <AmountPlaceholder pulsating={false} />)}
             </Text>
         );
-    } else {
-        return amount;
     }
-};
 
-export const InstantHeading: React.StatelessComponent<InstantHeadingProps> = props => (
-    <Container backgroundColor={ColorOption.primaryColor} padding="20px" width="100%" borderRadius="3px 3px 0px 0px">
-        <Container marginBottom="5px">
-            <Text
-                letterSpacing="1px"
-                fontColor={ColorOption.white}
-                opacity={0.7}
-                fontWeight={500}
-                textTransform="uppercase"
-                fontSize="12px"
-            >
-                I want to buy
+    private _dollarAmount(): React.ReactNode {
+        return (
+            <Text fontSize="16px" fontColor={ColorOption.white}>
+                {format.ethBaseAmountInUsd(
+                    this.props.totalEthBaseAmount,
+                    this.props.ethUsdPrice,
+                    2,
+                    <AmountPlaceholder pulsating={false} />,
+                )}
             </Text>
-        </Container>
-        <Flex direction="row" justify="space-between">
-            <SelectedAssetAmountInput fontSize="45px" />
-            <Flex direction="column" justify="space-between">
-                <Container marginBottom="5px">
-                    <Text fontSize="16px" fontColor={ColorOption.white} fontWeight={500}>
-                        {loadingOrAmount(props.quoteRequestState, displaytotalEthBaseAmount(props))}
-                    </Text>
-                </Container>
-                <Text fontSize="16px" fontColor={ColorOption.white} opacity={0.7}>
-                    {loadingOrAmount(props.quoteRequestState, displayUsdAmount(props))}
-                </Text>
-            </Flex>
-        </Flex>
-    </Container>
-);
+        );
+    }
+}
diff --git a/packages/instant/src/components/ui/container.tsx b/packages/instant/src/components/ui/container.tsx
index 02b16e39f..5e2218c68 100644
--- a/packages/instant/src/components/ui/container.tsx
+++ b/packages/instant/src/components/ui/container.tsx
@@ -27,6 +27,7 @@ export interface ContainerProps {
     backgroundColor?: ColorOption;
     hasBoxShadow?: boolean;
     zIndex?: number;
+    opacity?: number;
 }
 
 const PlainContainer: React.StatelessComponent<ContainerProps> = ({ children, className }) => (
@@ -54,6 +55,7 @@ export const Container = styled(PlainContainer)`
     ${props => cssRuleIfExists(props, 'border-top')}
     ${props => cssRuleIfExists(props, 'border-bottom')}
     ${props => cssRuleIfExists(props, 'z-index')}
+    ${props => cssRuleIfExists(props, 'opacity')}
     ${props => (props.hasBoxShadow ? `box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1)` : '')};
     background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
     border-color: ${props => (props.borderColor ? props.theme[props.borderColor] : 'none')};
-- 
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