1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
|
import typing
from qtpy.QtCore import QPoint, QRectF, QSize, QSizeF, Qt
from qtpy.QtGui import QCursor, QPainter
from qtpy.QtWidgets import (QGraphicsDropShadowEffect, QGraphicsItem,
QGraphicsObject, QGraphicsProxyWidget,
QGraphicsSceneContextMenuEvent,
QGraphicsSceneHoverEvent, QGraphicsSceneMouseEvent,
QSizePolicy, QStyleOptionGraphicsItem, QWidget)
from .enums import ConnectionPolicy
from .node_connection_interaction import NodeConnectionInteraction
from .port import PortType
class NodeGraphicsObject(QGraphicsObject):
def __init__(self, scene, node):
super().__init__()
self._scene = scene
self._node = node
self._locked = False
self._proxy_widget = None
self._scene.addItem(self)
self.setFlag(QGraphicsItem.ItemDoesntPropagateOpacityToChildren, True)
self.setFlag(QGraphicsItem.ItemIsMovable, True)
self.setFlag(QGraphicsItem.ItemIsFocusable, True)
self.setFlag(QGraphicsItem.ItemIsSelectable, True)
self.setFlag(QGraphicsItem.ItemSendsScenePositionChanges, True)
self.setCacheMode(QGraphicsItem.DeviceCoordinateCache)
self._style = node.model.style
node_style = self._style.node
effect = QGraphicsDropShadowEffect()
effect.setOffset(4, 4)
effect.setBlurRadius(20)
effect.setColor(node_style.shadow_color)
self.setGraphicsEffect(effect)
self.setOpacity(node_style.opacity)
self.setAcceptHoverEvents(True)
self.setZValue(0)
self.embed_q_widget()
# connect to the move signals to emit the move signals in FlowScene
def on_move():
self._scene.node_moved.emit(self._node, self.pos())
self.xChanged.connect(on_move)
self.yChanged.connect(on_move)
def _cleanup(self):
if self._scene is not None:
self._scene.removeItem(self)
self._scene = None
def setPos(self, pos):
super().setPos(pos)
self.move_connections()
@property
def node(self):
"""
Node
Returns
-------
value : Node
"""
return self._node
def boundingRect(self) -> QRectF:
"""
boundingRect
Returns
-------
value : QRectF
"""
return self._node.geometry.bounding_rect
def set_geometry_changed(self):
self.prepareGeometryChange()
def move_connections(self):
"""
Visits all attached connections and corrects their corresponding end points.
"""
for conn in self._node.state.all_connections:
conn.graphics_object.move()
def lock(self, locked: bool):
"""
Lock
Parameters
----------
locked : bool
"""
self._locked = locked
self.setFlag(QGraphicsItem.ItemIsMovable, not locked)
self.setFlag(QGraphicsItem.ItemIsFocusable, not locked)
self.setFlag(QGraphicsItem.ItemIsSelectable, not locked)
def paint(self, painter: QPainter, option: QStyleOptionGraphicsItem, widget: QWidget):
"""
Paint
Parameters
----------
painter : QPainter
option : QStyleOptionGraphicsItem
widget : QWidget
"""
from .node_painter import NodePainter
# TODO
painter.setClipRect(option.exposedRect)
NodePainter.paint(painter, self._node, self._scene,
node_style=self._style.node,
connection_style=self._style.connection,
)
def itemChange(self, change: QGraphicsItem.GraphicsItemChange, value: typing.Any) -> typing.Any:
"""
itemChange
Parameters
----------
change : QGraphicsItem.GraphicsItemChange
value : any
Returns
-------
value : any
"""
if change == self.ItemPositionChange and self.scene():
self.move_connections()
return super().itemChange(change, value)
def mousePressEvent(self, event: QGraphicsSceneMouseEvent):
"""
mousePressEvent
Parameters
----------
event : QGraphicsSceneMouseEvent
"""
if self._locked:
return
# deselect all other items after self one is selected
if not self.isSelected() and not (event.modifiers() & Qt.ControlModifier):
self._scene.clearSelection()
node_geometry = self._node.geometry
for port_to_check in (PortType.input, PortType.output):
# TODO do not pass sceneTransform
port = node_geometry.check_hit_scene_point(port_to_check,
event.scenePos(),
self.sceneTransform())
if not port:
continue
connections = port.connections
# start dragging existing connection
if connections and port_to_check == PortType.input:
conn, = connections
interaction = NodeConnectionInteraction(self._node, conn, self._scene)
interaction.disconnect(port_to_check)
elif port_to_check == PortType.output:
# initialize new Connection
out_policy = port.connection_policy
if connections and out_policy == ConnectionPolicy.one:
conn, = connections
self._scene.delete_connection(conn)
# TODO_UPSTREAM: add to FlowScene
connection = self._scene.create_connection(port)
connection.graphics_object.grabMouse()
pos = QPoint(event.pos().x(), event.pos().y())
geom = self._node.geometry
state = self._node.state
if self._node.model.resizable() and geom.resize_rect.contains(pos):
state.resizing = True
def mouseMoveEvent(self, event: QGraphicsSceneMouseEvent):
"""
mouseMoveEvent
Parameters
----------
event : QGraphicsSceneMouseEvent
"""
geom = self._node.geometry
state = self._node.state
if state.resizing:
diff = event.pos() - event.lastPos()
w = self._node.model.embedded_widget()
if w:
self.prepareGeometryChange()
old_size = w.size() + QSize(diff.x(), diff.y())
w.setFixedSize(old_size)
old_size_f = QSizeF(old_size)
self._proxy_widget.setMinimumSize(old_size_f)
self._proxy_widget.setMaximumSize(old_size_f)
self._proxy_widget.setPos(geom.widget_position)
geom.recalculate_size()
self.update()
self.move_connections()
event.accept()
else:
super().mouseMoveEvent(event)
if event.lastPos() != event.pos():
self.move_connections()
event.ignore()
bounding = self.mapToScene(self.boundingRect()).boundingRect()
r = self.scene().sceneRect().united(bounding)
self.scene().setSceneRect(r)
def mouseReleaseEvent(self, event: QGraphicsSceneMouseEvent):
"""
mouseReleaseEvent
Parameters
----------
event : QGraphicsSceneMouseEvent
"""
state = self._node.state
state.resizing = False
super().mouseReleaseEvent(event)
# position connections precisely after fast node move
self.move_connections()
def hoverEnterEvent(self, event: QGraphicsSceneHoverEvent):
"""
hoverEnterEvent
Parameters
----------
event : QGraphicsSceneHoverEvent
"""
# void
# bring all the colliding nodes to background
overlap_items = self.collidingItems()
for item in overlap_items:
if item.zValue() > 0.0:
item.setZValue(0.0)
# bring self node forward
self.setZValue(1.0)
self._node.geometry.hovered = True
self.update()
self._scene.node_hovered.emit(self._node, event.screenPos())
event.accept()
def hoverLeaveEvent(self, event: QGraphicsSceneHoverEvent):
"""
hoverLeaveEvent
Parameters
----------
event : QGraphicsSceneHoverEvent
"""
self._node.geometry.hovered = False
self.update()
self._scene.node_hover_left.emit(self._node)
event.accept()
def hoverMoveEvent(self, event: QGraphicsSceneHoverEvent):
"""
hoverMoveEvent
Parameters
----------
q_graphics_scene_hover_event : QGraphicsSceneHoverEvent
"""
pos = event.pos()
geom = self._node.geometry
if (self._node.model.resizable() and
geom.resize_rect.contains(QPoint(pos.x(), pos.y()))):
self.setCursor(QCursor(Qt.SizeFDiagCursor))
else:
self.setCursor(QCursor())
event.accept()
def mouseDoubleClickEvent(self, event: QGraphicsSceneMouseEvent):
"""
mouseDoubleClickEvent
Parameters
----------
event : QGraphicsSceneMouseEvent
"""
super().mouseDoubleClickEvent(event)
self._scene.node_double_clicked.emit(self._node)
def contextMenuEvent(self, event: QGraphicsSceneContextMenuEvent):
"""
contextMenuEvent
Parameters
----------
event : QGraphicsSceneContextMenuEvent
"""
self._scene.node_context_menu.emit(
self._node, event.scenePos(), event.screenPos())
def embed_q_widget(self):
geom = self._node.geometry
widget = self._node.model.embedded_widget()
if widget is None:
return
self._proxy_widget = QGraphicsProxyWidget(self)
self._proxy_widget.setWidget(widget)
self._proxy_widget.setPreferredWidth(5)
geom.recalculate_size()
# If the widget wants to use as much vertical space as possible, set it
# to have the geomtry's equivalent_widget_height.
if widget.sizePolicy().verticalPolicy() & QSizePolicy.ExpandFlag:
self._proxy_widget.setMinimumHeight(geom.equivalent_widget_height())
self._proxy_widget.setPos(geom.widget_position)
self.update()
self._proxy_widget.setOpacity(1.0)
self._proxy_widget.setFlag(QGraphicsItem.ItemIgnoresParentOpacity)
|
