ui/src/assets/widgets/nodegraph.scss

// Copyright (C) 2025 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

.pf-canvas {
  height: 100%;
  overflow: hidden;
  background: linear-gradient(
      0deg,
      var(--pf-color-border-secondary) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      var(--pf-color-border-secondary) 1px,
      transparent 1px
    );
  background-size: 20px 20px;
  background-color: var(--pf-color-background);
  position: relative;
  user-select: none;
  font-family: var(--pf-font-compact);
  cursor: grab;
}

.pf-canvas-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}

.pf-nodegraph-controls {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 100;
  pointer-events: auto;
  display: flex;
  gap: 8px;
}

.pf-node {
  position: absolute;
  background: var(--pf-color-background-secondary);
  border: 2px solid var(--pf-color-border);
  border-radius: 8px;
  min-width: 180px;
  box-shadow: 0 4px 12px var(--pf-color-box-shadow);
  cursor: move;
  pointer-events: auto;
  padding-block: 12px;
}

// Wrapper for dock chains - uses flexbox to make children same width
.pf-dock-chain {
  position: absolute;
  display: flex;
  flex-direction: column;
  pointer-events: auto;
  box-shadow: 0 4px 12px var(--pf-color-box-shadow);

  // All nodes in chain stretch to same width (determined by widest node)
  .pf-node {
    width: 100%;
    position: relative !important;
    left: auto !important;
    top: auto !important;
    box-shadow: none; // No box shadow for docked nodes
  }
}

.pf-node.pf-selected {
  border-color: var(--pf-color-accent);
  box-shadow: 0 0 0 2px
    color-mix(in srgb, var(--pf-color-accent) 30%, transparent);
  z-index: 1; // Make sure box shadow appears above other nodes
}

// Docked child: flush top edge with no rounded corners or border
.pf-node.pf-docked-child {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  margin-top: -2px; // Overlap border with parent
}

// Parent with docked child: flush bottom edge with no rounded corners
.pf-node.pf-has-docked-child {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

// Dock target highlight with pulsing animation
.pf-node.pf-dock-target {
  box-shadow: 0 4px 0 3px var(--pf-color-accent);
  animation: pulse-dock 0.6s ease-in-out infinite;
}

@keyframes pulse-dock {
  0%,
  100% {
    box-shadow: 0 4px 0 3px var(--pf-color-accent);
  }
  50% {
    box-shadow: 0 6px 0 5px var(--pf-color-accent);
    opacity: 0.95;
  }
}

.pf-node-header {
  background: var(--pf-color-background);
  padding: 8px 12px;
  border-radius: 6px 6px 0 0;
  color: var(--pf-color-text);
  font-weight: bold;
  font-size: 14px;
  border-bottom: 1px solid var(--pf-color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.pf-node-title {
  flex: 1;
}

.pf-node-content {
  padding-inline: 12px;
}

.pf-port-row {
  position: relative;
  margin: 8px 0;
  color: var(--pf-color-text-muted);
  font-size: 13px;
  padding: 4px 16px;

  .pf-port {
    transform: translateY(-50%);
  }
}

.pf-port-input {
  text-align: left;
}

.pf-port-output {
  text-align: right;
}

.pf-port {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--pf-color-border);
  border: 2px solid var(--pf-color-border-secondary);
  cursor: crosshair;
  position: absolute;
  top: 50%;
  z-index: 10;
}

.pf-output:hover {
  background: var(--pf-color-accent);
  border-color: var(--pf-color-accent);
}

.pf-port.pf-connected {
  background: var(--pf-color-accent);
  border-color: var(--pf-color-accent);
}

.pf-port.pf-input {
  left: -8px;
}

.pf-port.pf-port-top {
  top: 0;
  left: 50%;
  transform: translateY(-50%);
}

.pf-port.pf-port-bottom {
  top: unset;
  bottom: 0;
  left: 50%;
  transform: translateY(50%);
}

.pf-port.pf-output {
  right: -8px;
}

svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: visible;
}

.pf-connection {
  stroke: var(--pf-color-accent);
  stroke-width: 2;
  fill: none;
  filter: drop-shadow(
    0 0 4px color-mix(in srgb, var(--pf-color-accent) 50%, transparent)
  );
  transition:
    stroke-width 0.2s,
    stroke 0.2s;
}

.pf-connection:hover {
  stroke: var(--pf-color-danger);
  stroke-width: 3;
  filter: drop-shadow(
    0 0 6px color-mix(in srgb, var(--pf-color-danger) 80%, transparent)
  );
}

.pf-temp-connection {
  stroke: var(--pf-color-text-muted);
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 5, 5;
}

.pf-connecting {
  cursor: crosshair;

  .pf-input:hover {
    background: var(--pf-color-accent);
    border-color: var(--pf-color-accent);
    cursor: copy;
  }
  .pf-output:hover {
    background: var(--pf-color-border);
    border-color: var(--pf-color-border-secondary);
    cursor: not-allowed;
  }
}

.pf-output.pf-active,
.pf-output.pf-active:hover {
  background: var(--pf-color-accent);
  border-color: var(--pf-color-accent);
  cursor: crosshair;
}

.pf-panning {
  cursor: grabbing;
}