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+import { ComponentChildren, h, VNode } from "preact";
+import { css } from "@linaria/core";
+import { theme, ripple } from "./style";
+import { alpha } from "./colors/manipulation";
+
+interface Props {
+ children?: ComponentChildren;
+ disabled?: boolean;
+ disableElevation?: boolean;
+ disableFocusRipple?: boolean;
+ endIcon?: VNode;
+ fullWidth?: boolean;
+ href?: string;
+ size?: "small" | "medium" | "large";
+ startIcon?: VNode;
+ variant?: "contained" | "outlined" | "text";
+ color?: "primary" | "secondary" | "success" | "error" | "info" | "warning";
+}
+
+const baseStyle = css`
+ display: inline-flex;
+ align-items: center;
+ justify-content: center;
+ position: relative;
+ box-sizing: border-box;
+ background-color: transparent;
+ outline: 0;
+ border: 0;
+ margin: 0;
+ border-radius: 0;
+ padding: 0;
+ cursor: pointer;
+ user-select: none;
+ vertical-align: middle;
+ text-decoration: none;
+ color: inherit;
+`;
+
+const button = css`
+ min-width: 64px;
+ &:hover {
+ text-decoration: none;
+ background-color: var(--text-primary-alpha-opacity);
+ @media (hover: none) {
+ background-color: transparent;
+ }
+ }
+ &:disabled {
+ color: ${theme.palette.action.disabled};
+ }
+`;
+
+const colorVariant = {
+ outlined: css`
+ color: var(--color-main);
+ border: 1px solid var(--color-main-alpha-half);
+ &:hover {
+ border: 1px solid var(--color-main);
+ background-color: var(--color-main-alpha-opacity);
+ }
+ &:disabled {
+ border: 1px solid ${theme.palette.action.disabledBackground};
+ }
+ `,
+ contained: css`
+ color: var(--color-contrastText);
+ background-color: var(--color-main);
+ box-shadow: ${theme.shadows[2]};
+ &:hover {
+ background-color: var(--color-dark);
+ }
+ &:active {
+ box-shadow: ${theme.shadows[8]};
+ }
+ &:focus-visible {
+ box-shadow: ${theme.shadows[6]};
+ }
+ &:disabled {
+ color: ${theme.palette.action.disabled};
+ box-shadow: ${theme.shadows[0]};
+ background-color: ${theme.palette.action.disabledBackground};
+ }
+ `,
+ text: css`
+ color: var(--color-main);
+ &:hover {
+ background-color: var(--color-main-alpha-opacity);
+ }
+ `,
+};
+
+const sizeVariant = {
+ outlined: {
+ small: css`
+ padding: 3px 9px;
+ font-size: ${theme.pxToRem(13)};
+ `,
+ medium: css`
+ padding: 5px 15px;
+ `,
+ large: css`
+ padding: 7px 21px;
+ font-size: ${theme.pxToRem(15)};
+ `,
+ },
+ contained: {
+ small: css`
+ padding: 4px 10px;
+ font-size: ${theme.pxToRem(13)};
+ `,
+ medium: css`
+ padding: 6px 16px;
+ `,
+ large: css`
+ padding: 8px 22px;
+ font-size: ${theme.pxToRem(15)};
+ `,
+ },
+ text: {
+ small: css`
+ padding: 4px 5px;
+ font-size: ${theme.pxToRem(13)};
+ `,
+ medium: css`
+ padding: 6px 8px;
+ `,
+ large: css`
+ padding: 8px 11px;
+ font-size: ${theme.pxToRem(15)};
+ `,
+ },
+};
+
+export function Button({
+ children,
+ disabled,
+ startIcon: sip,
+ endIcon: eip,
+ variant = "text",
+ size = "medium",
+ color = "primary",
+}: Props): VNode {
+ const style = css`
+ user-select: none;
+ width: 1em;
+ height: 1em;
+ display: inline-block;
+ fill: currentColor;
+ flex-shrink: 0;
+ transition: fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;
+
+ & > svg {
+ font-size: 20;
+ }
+ `;
+
+ const startIcon = sip && (
+ <span
+ class={[
+ css`
+ margin-right: 8px;
+ margin-left: -4px;
+ `,
+ style,
+ ].join(" ")}
+ >
+ {sip}
+ </span>
+ );
+ const endIcon = eip && (
+ <span
+ class={[
+ css`
+ margin-right: -4px;
+ margin-left: 8px;
+ `,
+ style,
+ ].join(" ")}
+ >
+ {eip}
+ </span>
+ );
+ return (
+ <button
+ disabled={disabled}
+ class={[
+ theme.typography.button,
+ theme.shape.borderRadius,
+ ripple,
+ baseStyle,
+ button,
+ colorVariant[variant],
+ sizeVariant[variant][size],
+ ].join(" ")}
+ style={{
+ "--color-main": theme.palette[color].main,
+ "--color-main-alpha-half": alpha(theme.palette[color].main, 0.5),
+ "--color-contrastText": theme.palette[color].contrastText,
+ "--color-dark": theme.palette[color].dark,
+ "--color-main-alpha-opacity": alpha(
+ theme.palette[color].main,
+ theme.palette.action.hoverOpacity,
+ ),
+ "--text-primary-alpha-opacity": alpha(
+ theme.palette.text.primary,
+ theme.palette.action.hoverOpacity,
+ ),
+ }}
+ >
+ {startIcon}
+ {children}
+ {endIcon}
+ </button>
+ );
+}