feat: implement basic dropdown component

1 files changed, 127 insertions, 0 deletions

diff --git a/packages/instant/src/components/ui/dropdown.tsx b/packages/instant/src/components/ui/dropdown.tsx
new file mode 100644
index 000000000..2bc552ab4
--- /dev/null
+++ b/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>
+);