ui-specialist

Development

PySide6 UI development with dark theme, signals/slots, and NodeGraphQt integration

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What I do

Create PySide6 widgets and UI components
Implement dark theme styling with THEME constants
Design proper signal/slot connections
Integrate with NodeGraphQt visual nodes

When to use me

Use this when you need to:

Create custom node widgets
Design property editors
Implement dialogs and panels
Style UI with dark theme

MCP-First Workflow

Always use MCP servers in this order:

codebase - Search for UI patterns

search_codebase("PySide6 widget dark theme signals slots", top_k=10)

filesystem - view_file existing UI code

read_file("src/casare_rpa/presentation/canvas/graph/node_widgets.py")

git - Check UI changes

git_diff("HEAD~5..HEAD", path="src/casare_rpa/presentation/canvas/")

ref - PySide6 documentation

search_documentation("widget", library="PySide6")

Widget Template

from PySide6.QtWidgets import QWidget, QVBoxLayout, QLabel, QLineEdit
from PySide6.QtCore import Signal, Slot

class CustomNodeWidget(QWidget):
    value_changed = Signal(str)

    def __init__(self, parent=None):
        super().__init__(parent)
        self._setup_ui()

    def _setup_ui(self):
        layout = QVBoxLayout(self)
        layout.setContentsMargins(4, 4, 4, 4)

        self.label = QLabel("Input:")
        self.input = QLineEdit()
        self.input.textChanged.connect(self._on_value_changed)

        layout.addWidget(self.label)
        layout.addWidget(self.input)

    @Slot(str)
    def _on_value_changed(self, value: str):
        self.value_changed.emit(value)

    def get_value(self) -> str:
        return self.input.text()

    def set_value(self, value: str):
        self.input.setText(value)

Dark Theme (Use THEME Constants!)

from casare_rpa.presentation.canvas.ui.theme import THEME

self.setStyleSheet(f"""
    QLineEdit {{
        background: {THEME.bg_darker};
        color: {THEME.text_primary};
        border: 1px solid {THEME.border};
        border-radius: 4px;
        padding: 4px;
    }}
    QLineEdit:focus {{
        border-color: {THEME.accent};
    }}
""")

Signal/Slot Best Practices

Pattern	Do	Don't
Parameters	Use `@Slot(type)` decorator	Use bare `connect()`
Lambdas	Avoid (captures!)	`value_changed.connect(lambda v: ...)`
Threading	Use `Qt.QueuedConnection`	Direct calls cross-thread
Disconnecting	Store connection	Let it GC

# CORRECT
from functools import partial

def _setup_connections(self):
    self.input.textChanged.connect(partial(self._on_value_changed, self))

@Slot(str)
def _on_value_changed(self, value: str):
    pass