feat: implement basic dropdown component

packages/instant/src/components/erc20_asset_amount_input.tsx

@@ -113,7 +113,7 @@ export class ERC20AssetAmountInput extends React.Component<ERC20AssetAmountInput
         }
         return (
             <Container marginLeft="5px">
-                <Icon icon="chevron" width={12} onClick={this._handleSelectAssetClick} />
+                <Icon icon="chevron" width={12} stroke={ColorOption.white} onClick={this._handleSelectAssetClick} />
             </Container>
         );
     };

packages/instant/src/components/payment_method.tsx

@@ -0,0 +1,31 @@
+import * as _ from 'lodash';
+import * as React from 'react';
+
+import { ColorOption } from '../style/theme';
+
+import { Container } from './ui/container';
+import { Dropdown } from './ui/dropdown';
+import { Text } from './ui/text';
+
+export interface PaymentMethodProps {}
+
+export class PaymentMethod extends React.Component<PaymentMethodProps> {
+    public render(): React.ReactNode {
+        return (
+            <Container padding="20px" width="100%">
+                <Container marginBottom="10px">
+                    <Text
+                        letterSpacing="1px"
+                        fontColor={ColorOption.primaryColor}
+                        fontWeight={600}
+                        textTransform="uppercase"
+                        fontSize="14px"
+                    >
+                        Payment Method
+                    </Text>
+                </Container>
+                <Dropdown value="0x00000000000000" label="25.33 ETH" />
+            </Container>
+        );
+    }
+}

packages/instant/src/components/ui/dropdown.tsx

@@ -0,0 +1,127 @@
+import * as _ from 'lodash';
+import * as React from 'react';
+
+import { ColorOption } from '../../style/theme';
+import { zIndex } from '../../style/z_index';
+
+import { Container } from './container';
+import { Flex } from './flex';
+import { Icon } from './icon';
+import { Text } from './text';
+
+export interface DropdownItemConfig {
+    text: string;
+    onClick?: () => void;
+}
+
+export interface DropdownProps {
+    value: string;
+    label: string;
+    items: DropdownItemConfig[];
+}
+
+export interface DropdownState {
+    isOpen: boolean;
+}
+
+export class Dropdown extends React.Component<DropdownProps, DropdownState> {
+    public static defaultProps = {
+        items: [
+            {
+                text: 'Item 1',
+            },
+            {
+                text: 'Item 2',
+            },
+        ],
+    };
+    public state: DropdownState = {
+        isOpen: false,
+    };
+    public render(): React.ReactNode {
+        const { value, label, items } = this.props;
+        const { isOpen } = this.state;
+        const hasItems = !_.isEmpty(items);
+        const borderRadius = isOpen ? '4px 4px 0px 0px' : '4px';
+        return (
+            <Container position="relative">
+                <Container
+                    cursor={hasItems ? 'pointer' : undefined}
+                    onClick={this._handleDropdownClick}
+                    hasBoxShadow={true}
+                    borderRadius={borderRadius}
+                    border="1px solid"
+                    borderColor={ColorOption.feintGrey}
+                    padding="0.8em"
+                    borderBottom="1px solid"
+                >
+                    <Flex justify="space-between">
+                        <Text fontSize="16px" lineHeight="19px" fontColor={ColorOption.darkGrey}>
+                            {value}
+                        </Text>
+                        <Container>
+                            <Text fontSize="16px" lineHeight="17px" fontColor={ColorOption.lightGrey}>
+                                {label}
+                            </Text>
+                            {hasItems && (
+                                <Container marginLeft="5px" display="inline-block" position="relative" bottom="2px">
+                                    <Icon padding="3px" icon="chevron" width={12} stroke={ColorOption.grey} />
+                                </Container>
+                            )}
+                        </Container>
+                    </Flex>
+                </Container>
+                {isOpen && (
+                    <Container
+                        width="100%"
+                        position="absolute"
+                        onClick={this._closeDropdown}
+                        backgroundColor={ColorOption.white}
+                        hasBoxShadow={true}
+                        zIndex={zIndex.dropdownItems}
+                    >
+                        {_.map(items, (item, index) => (
+                            <DropdownItem key={item.text} {...item} isLast={index === items.length - 1} />
+                        ))}
+                    </Container>
+                )}
+            </Container>
+        );
+    }
+    private readonly _handleDropdownClick = (): void => {
+        if (_.isEmpty(this.props.items)) {
+            return;
+        }
+        this.setState({
+            isOpen: !this.state.isOpen,
+        });
+    };
+    private readonly _closeDropdown = (): void => {
+        this.setState({
+            isOpen: false,
+        });
+    };
+}
+
+export interface DropdownItemProps extends DropdownItemConfig {
+    text: string;
+    onClick?: () => void;
+    isLast: boolean;
+}
+
+export const DropdownItem: React.StatelessComponent<DropdownItemProps> = ({ text, onClick, isLast }) => (
+    <Container
+        onClick={onClick}
+        cursor="pointer"
+        darkenOnHover={true}
+        backgroundColor={ColorOption.white}
+        padding="0.8em"
+        borderTop="0"
+        border="1px solid"
+        borderRadius={isLast ? '0px 0px 4px 4px' : undefined}
+        width="100%"
+        borderColor={ColorOption.feintGrey}
+    >
+        <Text>{text}</Text>
+    </Container>
+);

packages/instant/src/components/ui/icon.tsx

@@ -9,7 +9,6 @@ interface IconInfo {
     path: string;
     fillRule?: svgRule;
     clipRule?: svgRule;
-    stroke?: string;
     strokeOpacity?: number;
     strokeWidth?: number;
     strokeLinecap?: 'butt' | 'round' | 'square' | 'inherit';
@@ -47,7 +46,6 @@ const ICONS: IconInfoMapping = {
     chevron: {
         viewBox: '0 0 12 7',
         path: 'M11 1L6 6L1 1',
-        stroke: 'white',
         strokeOpacity: 0.5,
         strokeWidth: 1.5,
         strokeLinecap: 'round',
@@ -67,6 +65,7 @@ export interface IconProps {
     width: number;
     height?: number;
     color?: ColorOption;
+    stroke?: ColorOption;
     icon: keyof IconInfoMapping;
     onClick?: (event: React.MouseEvent<HTMLElement>) => void;
     padding?: string;
@@ -75,6 +74,7 @@ export interface IconProps {
 const PlainIcon: React.StatelessComponent<IconProps> = props => {
     const iconInfo = ICONS[props.icon];
     const colorValue = _.isUndefined(props.color) ? undefined : props.theme[props.color];
+    const strokeValue = _.isUndefined(props.stroke) ? undefined : props.theme[props.stroke];
     return (
         <div onClick={props.onClick} className={props.className}>
             <svg
@@ -89,7 +89,7 @@ const PlainIcon: React.StatelessComponent<IconProps> = props => {
                     fill={colorValue}
                     fillRule={iconInfo.fillRule || 'nonzero'}
                     clipRule={iconInfo.clipRule || 'nonzero'}
-                    stroke={iconInfo.stroke}
+                    stroke={strokeValue}
                     strokeOpacity={iconInfo.strokeOpacity}
                     strokeWidth={iconInfo.strokeWidth}
                     strokeLinecap={iconInfo.strokeLinecap}
@@ -101,7 +101,8 @@ const PlainIcon: React.StatelessComponent<IconProps> = props => {
 };
 
 export const Icon = withTheme(styled(PlainIcon)`
-    cursor: ${props => (!_.isUndefined(props.onClick) ? 'pointer' : 'default')};
+    display: inline-block;
+    ${props => (!_.isUndefined(props.onClick) ? 'cursor: pointer' : '')};
     transition: opacity 0.5s ease;
     padding: ${props => props.padding};
     opacity: ${props => (!_.isUndefined(props.onClick) ? 0.7 : 1)};

packages/instant/src/components/zero_ex_instant_container.tsx

@@ -3,15 +3,15 @@ import * as React from 'react';
 import { AvailableERC20TokenSelector } from '../containers/available_erc20_token_selector';
 import { LatestBuyQuoteOrderDetails } from '../containers/latest_buy_quote_order_details';
 import { LatestError } from '../containers/latest_error';
+import { SelectedAssetBuyOrderProgress } from '../containers/selected_asset_buy_order_progress';
 import { SelectedAssetBuyOrderStateButtons } from '../containers/selected_asset_buy_order_state_buttons';
 import { SelectedAssetInstantHeading } from '../containers/selected_asset_instant_heading';
 
-import { SelectedAssetBuyOrderProgress } from '../containers/selected_asset_buy_order_progress';
-
 import { ColorOption } from '../style/theme';
 import { zIndex } from '../style/z_index';
 
 import { SlideAnimationState } from './animations/slide_animation';
+import { PaymentMethod } from './payment_method';
 import { SlidingPanel } from './sliding_panel';
 import { Container } from './ui/container';
 import { Flex } from './ui/flex';
@@ -41,6 +41,7 @@ export class ZeroExInstantContainer extends React.Component<ZeroExInstantContain
                 >
                     <Flex direction="column" justify="flex-start">
                         <SelectedAssetInstantHeading onSelectAssetClick={this._handleSymbolClick} />
+                        <PaymentMethod />
                         <SelectedAssetBuyOrderProgress />
                         <LatestBuyQuoteOrderDetails />
                         <Container padding="20px" width="100%">

packages/instant/src/style/z_index.ts

@@ -1,5 +1,6 @@
 export const zIndex = {
     errorPopup: 1,
     mainContainer: 2,
-    panel: 3,
+    dropdownItems: 3,
+    panel: 4,
 };