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import math
from qtpy.QtCore import QPointF, QRectF, Qt
from qtpy.QtGui import QFontMetrics, QLinearGradient, QPainter, QPen
from .base import FlowSceneBase, NodeBase
from .enums import NodeValidationState, PortType
from .node_data import NodeDataModel
from .node_geometry import NodeGeometry
from .node_graphics_object import NodeGraphicsObject
from .node_state import NodeState
from .style import ConnectionStyle, NodeStyle
class NodePainterDelegate:
def paint(self, painter: QPainter, geom: NodeGeometry, model: NodeDataModel):
"""
Paint
Parameters
----------
painter : QPainter
geom : NodeGeometry
model : NodeDataModel
"""
...
class NodePainter:
@staticmethod
def paint(painter: QPainter, node: NodeBase, scene: FlowSceneBase,
node_style: NodeStyle, connection_style: ConnectionStyle):
"""
Paint
Parameters
----------
painter : QPainter
node : Node
scene : FlowScene
node_style : NodeStyle
connection_style : ConnectionStyle
"""
geom = node.geometry
state = node.state
graphics_object = node.graphics_object
geom.recalculate_size(painter.font())
model = node.model
NodePainter.draw_node_rect(painter, geom, model, graphics_object,
node_style)
NodePainter.draw_connection_points(painter, geom, state, model, scene,
node_style, connection_style)
NodePainter.draw_filled_connection_points(painter, geom, state, model,
node_style, connection_style
)
NodePainter.draw_model_name(painter, geom, state, model, node_style)
NodePainter.draw_entry_labels(painter, geom, state, model, node_style)
NodePainter.draw_resize_rect(painter, geom, model)
NodePainter.draw_validation_rect(painter, geom, model, graphics_object,
node_style)
# call custom painter
painter_delegate = model.painter_delegate()
if painter_delegate:
painter_delegate.paint(painter, geom, model)
@staticmethod
def draw_node_rect(painter: QPainter, geom: NodeGeometry,
model: NodeDataModel,
graphics_object: NodeGraphicsObject,
node_style: NodeStyle):
"""
Draw node rect
Parameters
----------
painter : QPainter
geom : NodeGeometry
model : NodeDataModel
graphics_object : NodeGraphicsObject
node_style : NodeStyle
"""
color = (node_style.selected_boundary_color
if graphics_object.isSelected()
else node_style.normal_boundary_color
)
p = QPen(color, (node_style.hovered_pen_width
if geom.hovered
else node_style.pen_width))
painter.setPen(p)
gradient = QLinearGradient(QPointF(0.0, 0.0),
QPointF(2.0, geom.height))
for at_, color in node_style.gradient_colors:
gradient.setColorAt(at_, color)
painter.setBrush(gradient)
diam = node_style.connection_point_diameter
boundary = QRectF(-diam,
-diam,
2.0 * diam + geom.width,
2.0 * diam + geom.height)
radius = 3.0
painter.drawRoundedRect(boundary, radius, radius)
@staticmethod
def draw_model_name(painter: QPainter, geom: NodeGeometry,
state: NodeState,
model: NodeDataModel,
node_style: NodeStyle):
"""
Draw model name
Parameters
----------
painter : QPainter
geom : NodeGeometry
state : NodeState
model : NodeDataModel
"""
if not model.caption_visible:
return
name = model.caption
f = painter.font()
f.setBold(True)
metrics = QFontMetrics(f)
rect = metrics.boundingRect(name)
position = QPointF((geom.width - rect.width()) / 2.0,
(geom.spacing + geom.entry_height) / 3.0)
painter.setFont(f)
painter.setPen(node_style.font_color)
painter.drawText(position, name)
f.setBold(False)
painter.setFont(f)
@staticmethod
def draw_entry_labels(painter: QPainter, geom: NodeGeometry,
state: NodeState, model: NodeDataModel,
node_style: NodeStyle):
"""
Draw entry labels
Parameters
----------
painter : QPainter
geom : NodeGeometry
state : NodeState
model : NodeDataModel
node_style : NodeStyle
"""
metrics = painter.fontMetrics()
for port in state.ports:
scene_pos = port.scene_position
if not port.connections:
painter.setPen(node_style.font_color_faded)
else:
painter.setPen(node_style.font_color)
display_text = port.display_text
rect = metrics.boundingRect(display_text)
scene_pos.setY(scene_pos.y() + rect.height() / 4.0)
if port.port_type == PortType.input:
scene_pos.setX(5.0)
elif port.port_type == PortType.output:
scene_pos.setX(geom.width - 5.0 - rect.width())
painter.drawText(scene_pos, display_text)
@staticmethod
def draw_connection_points(painter: QPainter, geom: NodeGeometry,
state: NodeState, model: NodeDataModel,
scene: FlowSceneBase, node_style: NodeStyle,
connection_style: ConnectionStyle
):
"""
Draw connection points
Parameters
----------
painter : QPainter
geom : NodeGeometry
state : NodeState
model : NodeDataModel
scene : FlowScene
connection_style : ConnectionStyle
"""
diameter = node_style.connection_point_diameter
reduced_diameter = diameter * 0.6
for port in state.ports:
scene_pos = port.scene_position
can_connect = port.can_connect
port_type = port.port_type
data_type = port.data_type
r = 1.0
if state.is_reacting and can_connect and port_type == state.reacting_port_type:
diff = geom.dragging_pos - scene_pos
dist = math.sqrt(QPointF.dotProduct(diff, diff))
registry = scene.registry
dtype1, dtype2 = state.reacting_data_type, data_type
if port_type != PortType.input:
dtype2, dtype1 = dtype1, dtype2
type_convertable = registry.get_type_converter(dtype1, dtype2) is not None
if dtype1.id == dtype2.id or type_convertable:
thres = 40.0
r = ((2.0 - dist / thres)
if dist < thres
else 1.0)
else:
thres = 80.0
r = ((dist / thres)
if dist < thres
else 1.0)
if connection_style.use_data_defined_colors:
brush = connection_style.get_normal_color(data_type.id)
else:
brush = node_style.connection_point_color
painter.setBrush(brush)
painter.drawEllipse(scene_pos, reduced_diameter * r, reduced_diameter * r)
@staticmethod
def draw_filled_connection_points(painter: QPainter, geom: NodeGeometry,
state: NodeState, model: NodeDataModel,
node_style: NodeStyle,
connection_style: ConnectionStyle
):
"""
Draw filled connection points
Parameters
----------
painter : QPainter
geom : NodeGeometry
state : NodeState
model : NodeDataModel
node_style : NodeStyle
connection_style : ConnectionStyle
"""
diameter = node_style.connection_point_diameter
for port in state.ports:
if not port.connections:
continue
scene_pos = port.scene_position
if connection_style.use_data_defined_colors:
c = connection_style.get_normal_color(port.data_type.id)
else:
c = node_style.filled_connection_point_color
painter.setPen(c)
painter.setBrush(c)
painter.drawEllipse(scene_pos, diameter * 0.4, diameter * 0.4)
@staticmethod
def draw_resize_rect(painter: QPainter, geom: NodeGeometry, model: NodeDataModel):
"""
Draw resize rect
Parameters
----------
painter : QPainter
geom : NodeGeometry
model : NodeDataModel
"""
if model.resizable():
painter.setBrush(Qt.gray)
painter.drawEllipse(geom.resize_rect)
@staticmethod
def draw_validation_rect(painter: QPainter, geom: NodeGeometry,
model: NodeDataModel,
graphics_object: NodeGraphicsObject,
node_style: NodeStyle):
"""
Draw validation rect
Parameters
----------
painter : QPainter
geom : NodeGeometry
model : NodeDataModel
graphics_object : NodeGraphicsObject
node_style : NodeStyle
"""
model_validation_state = model.validation_state()
if model_validation_state == NodeValidationState.valid:
return
color = (node_style.selected_boundary_color
if graphics_object.isSelected()
else node_style.normal_boundary_color)
if geom.hovered:
p = QPen(color, node_style.hovered_pen_width)
else:
p = QPen(color, node_style.pen_width)
painter.setPen(p)
# Drawing the validation message background
if model_validation_state == NodeValidationState.error:
painter.setBrush(node_style.error_color)
else:
painter.setBrush(node_style.warning_color)
radius = 3.0
diam = node_style.connection_point_diameter
boundary = QRectF(
-diam,
-diam + geom.height - geom.validation_height,
2.0 * diam + geom.width,
2.0 * diam + geom.validation_height,
)
painter.drawRoundedRect(boundary, radius, radius)
painter.setBrush(Qt.gray)
# Drawing the validation message itself
error_msg = model.validation_message()
f = painter.font()
metrics = QFontMetrics(f)
rect = metrics.boundingRect(error_msg)
position = QPointF(
(geom.width - rect.width()) / 2.0,
geom.height - (geom.validation_height - diam) / 2.0
)
painter.setFont(f)
painter.setPen(node_style.font_color)
painter.drawText(position, error_msg)
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