Refactor: CSS handling (#2344)

* refactor(css): only load base styles, add css task, cleanup exports
* style(base): add edge label bg
* refactor(css): use css-utils
* feat(core): add Panel component
* refactor(background): cleanup
* refactor(css-handling): cleanup

packages/core/src/styles/base.ts

@@ -0,0 +1,226 @@
+const style = `
+.react-flow__container {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  top: 0;
+  left: 0;
+}
+
+.react-flow__pane {
+  z-index: 1;
+}
+
+.react-flow__viewport {
+  transform-origin: 0 0;
+  z-index: 2;
+  pointer-events: none;
+}
+
+.react-flow__renderer {
+  z-index: 4;
+}
+
+.react-flow__selectionpane {
+  z-index: 5;
+}
+
+.react-flow__nodesselection-rect,
+.react-flow__selection {
+  background: rgba(150, 150, 180, 0.1);
+  border: 1px dotted rgba(155, 155, 155, 0.8);
+}
+
+.react-flow__nodesselection-rect:focus,
+.react-flow__nodesselection-rect:focus-visible {
+  outline: none;
+}
+
+.react-flow .react-flow__edges {
+  pointer-events: none;
+  overflow: visible;
+}
+
+.react-flow__connection {
+  pointer-events: none;
+}
+
+.react-flow__connection.animated {
+  stroke-dasharray: 5;
+  animation: dashdraw 0.5s linear infinite;
+}
+
+.react-flow .react-flow__connectionline {
+  z-index: 1001;
+}
+
+.react-flow__connectionline path, .react-flow__edge path {
+  fill: none;
+}
+
+.react-flow__edge-path, .react-flow__connection-path {
+  stroke: #b1b1b7;
+  stroke-width: 1;
+}
+
+.react-flow__edge {
+  pointer-events: visibleStroke;
+}
+
+.react-flow__edge.animated path {
+  stroke-dasharray: 5;
+  animation: dashdraw 0.5s linear infinite;
+}
+
+.react-flow__edge.inactive {
+  pointer-events: none;
+}
+
+.react-flow__edge.selected, .react-flow__edge:focus, .react-flow__edge:focus-visible {
+  outline: none;
+}
+
+.react-flow__edge.selected .react-flow__edge-path,
+.react-flow__edge:focus .react-flow__edge-path,
+.react-flow__edge:focus-visible .react-flow__edge-path {
+  stroke: #555;
+}
+
+@keyframes dashdraw {
+  from {
+    stroke-dashoffset: 10;
+  }
+}
+
+.react-flow__edge-textwrapper {
+  pointer-events: all;
+}
+
+.react-flow__edge-text {
+  pointer-events: none;
+  user-select: none;
+}
+
+.react-flow__edge-textbg {
+  fill: white;
+}
+
+.react-flow__nodes {
+  pointer-events: none;
+  transform-origin: 0 0;
+}
+
+.react-flow__node {
+  position: absolute;
+  user-select: none;
+  pointer-events: all;
+  transform-origin: 0 0;
+  box-sizing: border-box;
+  background-color: white;
+  cursor: grab;
+  border: 1px solid #bbb;
+}
+
+.react-flow__node.selected,
+.react-flow__node:focus,
+.react-flow__node:focus-visible  {
+  outline: none;
+  border: 1px solid #555;
+}
+
+.react-flow__nodesselection {
+  z-index: 3;
+  transform-origin: left top;
+  pointer-events: none;
+}
+
+.react-flow__nodesselection-rect {
+  position: absolute;
+  pointer-events: all;
+  cursor: grab;
+}
+
+.react-flow__handle {
+  position: absolute;
+  pointer-events: none;
+  min-width: 5px;
+  min-height: 5px;
+  background-color: #333;
+}
+
+.react-flow__handle.connectable {
+  pointer-events: all;
+}
+
+.react-flow__handle-bottom {
+  top: auto;
+  left: 50%;
+  bottom: -4px;
+  transform: translate(-50%, 0);
+}
+
+.react-flow__handle-top {
+  left: 50%;
+  top: -4px;
+  transform: translate(-50%, 0);
+}
+
+.react-flow__handle-left {
+  top: 50%;
+  left: -4px;
+  transform: translate(0, -50%);
+}
+
+.react-flow__handle-right {
+  right: -4px;
+  top: 50%;
+  transform: translate(0, -50%);
+}
+
+.react-flow__edgeupdater {
+  cursor: move;
+  pointer-events: all;
+}
+
+.react-flow__panel {
+  position: absolute;
+  z-index: 1000;
+  margin: 15px;
+}
+
+.react-flow__panel.top {
+  top: 0;
+}
+
+.react-flow__panel.bottom {
+  bottom: 0;
+}
+
+.react-flow__panel.left {
+  left: 0;
+}
+
+.react-flow__panel.right {
+  right: 0;
+}
+
+.react-flow__panel.center {
+  left: 50%;
+  transform: translateX(-50%);
+}
+
+.react-flow__attribution {
+  font-size: 10px;
+  background: rgba(255, 255, 255, 0.5);
+  padding: 2px 3px;
+  color: #999;
+  margin: 0;
+}
+
+.react-flow__attribution a {
+  color: #555;
+  text-decoration: none;
+}
+`;
+
+export default style;

packages/core/src/styles/index.ts

@@ -0,0 +1,9 @@
+import { CSSProperties } from 'react';
+
+export const containerStyle: CSSProperties = {
+  position: 'absolute',
+  width: '100%',
+  height: '100%',
+  top: 0,
+  left: 0,
+};

packages/core/src/styles/theme-default.css

@@ -0,0 +1,83 @@
+.react-flow__edge {
+  &.updating {
+    .react-flow__edge-path {
+      stroke: #777;
+    }
+  }
+}
+
+.react-flow__edge-text {
+  font-size: 10px;
+}
+
+.react-flow__node-default,
+.react-flow__node-input,
+.react-flow__node-output,
+.react-flow__node-group {
+  padding: 10px;
+  border-radius: 3px;
+  width: 150px;
+  font-size: 12px;
+  color: #222;
+  text-align: center;
+  border-width: 1px;
+  border-style: solid;
+  border-color: #1a192b;
+
+  &.selected,
+  &:focus,
+  &:focus-visible {
+    border: none;
+    box-shadow: 0 0 0 0.5px #1a192b;
+    outline: none;
+  }
+
+  .react-flow__handle {
+    background: #1a192b;
+  }
+}
+
+.react-flow__node-default.selectable,
+.react-flow__node-input.selectable,
+.react-flow__node-output.selectable,
+.react-flow__node-group.selectable {
+  &:hover {
+    box-shadow: 0 1px 4px 1px rgba(0, 0, 0, 0.08);
+  }
+
+  &.selected,
+  &:focus,
+  &:focus-visible {
+    border: none;
+    box-shadow: 0 0 0 0.5px #1a192b;
+    outline: none;
+  }
+}
+
+.react-flow__node-group {
+  background: rgba(240, 240, 240, 0.25);
+  border-color: #1a192b;
+}
+
+.react-flow__nodesselection-rect,
+.react-flow__selection {
+  background: rgba(0, 89, 220, 0.08);
+  border: 1px dotted rgba(0, 89, 220, 0.8);
+
+  &:focus,
+  &:focus-visible {
+    outline: none;
+  }
+}
+
+.react-flow__handle {
+  width: 6px;
+  height: 6px;
+  background: #555;
+  border: 1px solid white;
+  border-radius: 100%;
+
+  &.connectable {
+    cursor: crosshair;
+  }
+}