class NodeGraph(QtCore.QObject):
"""
base node graph controller.
"""
#: signal emits the node object when a node is created in the node graph.
node_created = QtCore.Signal(NodeObject)
#: signal emits a list of node ids from the deleted nodes.
nodes_deleted = QtCore.Signal(list)
#: signal emits the node object when selected in the node graph.
node_selected = QtCore.Signal(NodeObject)
#: signal triggered when a node is double clicked and emits the node.
node_double_clicked = QtCore.Signal(NodeObject)
#: signal for when a node has been connected emits (source port, target port).
port_connected = QtCore.Signal(Port, Port)
#: signal for when a node has been disconnected emits (source port, target port).
port_disconnected = QtCore.Signal(Port, Port)
#: signal for when a node property has changed emits (node, property name, property value).
property_changed = QtCore.Signal(NodeObject, str, object)
#: signal for when drop data has been added to the graph.
data_dropped = QtCore.Signal(QtCore.QMimeData, QtCore.QPoint)
def __init__(self, parent=None):
super(NodeGraph, self).__init__(parent)
self.setObjectName('NodeGraphQt')
self._model = NodeGraphModel()
self._viewer = NodeViewer(parent)
self._node_factory = NodeFactory()
self._undo_stack = QtWidgets.QUndoStack(self)
tab = QtWidgets.QAction('Search Nodes', self)
tab.setShortcut('tab')
tab.triggered.connect(self._toggle_tab_search)
self._viewer.addAction(tab)
self._wire_signals()
def __repr__(self):
return '<{} object at {}>'.format(self.__class__.__name__,
hex(id(self)))
def _wire_signals(self):
# internal signals.
self._viewer.search_triggered.connect(self._on_search_triggered)
self._viewer.connection_sliced.connect(self._on_connection_sliced)
self._viewer.connection_changed.connect(self._on_connection_changed)
self._viewer.moved_nodes.connect(self._on_nodes_moved)
self._viewer.node_double_clicked.connect(self._on_node_double_clicked)
# pass through signals.
self._viewer.node_selected.connect(self._on_node_selected)
self._viewer.data_dropped.connect(self._on_node_data_dropped)
def _toggle_tab_search(self):
"""
toggle the tab search widget.
"""
self._viewer.tab_search_set_nodes(self._node_factory.names)
self._viewer.tab_search_toggle()
def _on_property_bin_changed(self, node_id, prop_name, prop_value):
"""
called when a property widget has changed in a properties bin.
(emits the node object, property name, property value)
Args:
node_id (str): node id.
prop_name (str): node property name.
prop_value (object): python object.
"""
node = self.get_node_by_id(node_id)
# prevent signals from causing a infinite loop.
if node.get_property(prop_name) != prop_value:
node.set_property(prop_name, prop_value)
def _on_node_double_clicked(self, node_id):
"""
called when a node in the viewer is double click.
(emits the node object when the node is clicked)
Args:
node_id (str): node id emitted by the viewer.
"""
node = self.get_node_by_id(node_id)
self.node_double_clicked.emit(node)
def _on_node_selected(self, node_id):
"""
called when a node in the viewer is selected on left click.
(emits the node object when the node is clicked)
Args:
node_id (str): node id emitted by the viewer.
"""
node = self.get_node_by_id(node_id)
self.node_selected.emit(node)
def _on_node_data_dropped(self, data, pos):
"""
called when data has been dropped on the viewer.
Args:
data (QtCore.QMimeData): mime data.
pos (QtCore.QPoint): scene position relative to the drop.
"""
# don't emit signal for internal widget drops.
if data.hasFormat('text/plain'):
if data.text().startswith('<${}>:'.format(DRAG_DROP_ID)):
node_ids = data.text()[len('<${}>:'.format(DRAG_DROP_ID)):]
x, y = pos.x(), pos.y()
for node_id in node_ids.split(','):
self.create_node(node_id, pos=[x, y])
x += 20
y += 20
return
self.data_dropped.emit(data, pos)
def _on_nodes_moved(self, node_data):
"""
called when selected nodes in the viewer has changed position.
Args:
node_data (dict): {<node_view>: <previous_pos>}
"""
self._undo_stack.beginMacro('move nodes')
for node_view, prev_pos in node_data.items():
node = self._model.nodes[node_view.id]
self._undo_stack.push(NodeMovedCmd(node, node.pos(), prev_pos))
self._undo_stack.endMacro()
def _on_search_triggered(self, node_type, pos):
"""
called when the tab search widget is triggered in the viewer.
Args:
node_type (str): node identifier.
pos (tuple): x,y position for the node.
"""
self.create_node(node_type, pos=pos)
def _on_connection_changed(self, disconnected, connected):
"""
called when a pipe connection has been changed in the viewer.
Args:
disconnected (list[list[widgets.port.PortItem]):
pair list of port view items.
connected (list[list[widgets.port.PortItem]]):
pair list of port view items.
"""
if not (disconnected or connected):
return
label = 'connect node(s)' if connected else 'disconnect node(s)'
ptypes = {'in': 'inputs', 'out': 'outputs'}
self._undo_stack.beginMacro(label)
for p1_view, p2_view in disconnected:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.disconnect_from(port2)
for p1_view, p2_view in connected:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.connect_to(port2)
self._undo_stack.endMacro()
def _on_connection_sliced(self, ports):
"""
slot when connection pipes have been sliced.
Args:
ports (list[list[widgets.port.PortItem]]):
pair list of port connections (in port, out port)
"""
if not ports:
return
ptypes = {'in': 'inputs', 'out': 'outputs'}
self._undo_stack.beginMacro('slice connections')
for p1_view, p2_view in ports:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.disconnect_from(port2)
self._undo_stack.endMacro()
@property
def model(self):
"""
Returns the model used to store the node graph data.
Returns:
NodeGraphQt.base.model.NodeGraphModel: node graph model.
"""
return self._model
def show(self):
"""
Show node graph viewer widget this is just a convenience
function to :meth:`NodeGraph.viewer().show()`.
"""
self._viewer.show()
def close(self):
"""
Close node graph NodeViewer widget this is just a convenience
function to :meth:`NodeGraph.viewer().close()`.
"""
self._viewer.close()
def viewer(self):
"""
Return the node graph viewer widget.
Returns:
NodeGraphQt.widgets.viewer.NodeViewer: viewer widget.
"""
return self._viewer
def scene(self):
"""
Return the scene object.
Returns:
NodeGraphQt.widgets.scene.NodeScene: node scene.
"""
return self._viewer.scene()
def background_color(self):
"""
Return the node graph background color.
Returns:
tuple: r, g ,b
"""
return self.scene().background_color
def set_background_color(self, r, g, b):
"""
Set node graph background color.
Args:
r (int): red value.
g (int): green value.
b (int): blue value.
"""
self.scene().background_color = (r, g, b)
def grid_color(self):
"""
Return the node graph grid color.
Returns:
tuple: r, g ,b
"""
return self.scene().grid_color
def set_grid_color(self, r, g, b):
"""
Set node graph grid color.
Args:
r (int): red value.
g (int): green value.
b (int): blue value.
"""
self.scene().grid_color = (r, g, b)
def display_grid(self, display=True):
"""
Display node graph background grid.
Args:
display: False to not draw the background grid.
"""
self.scene().grid = display
def add_properties_bin(self, prop_bin):
"""
Wire up a properties bin widget to the node graph.
Args:
prop_bin (NodeGraphQt.PropertiesBinWidget): properties widget.
"""
prop_bin.property_changed.connect(self._on_property_bin_changed)
def undo_stack(self):
"""
Returns the undo stack used in the node graph
Returns:
QtWidgets.QUndoStack: undo stack.
"""
return self._undo_stack
def clear_undo_stack(self):
"""
Clears the undo stack.
(convenience function to :meth:`NodeGraph.undo_stack().clear`)
"""
self._undo_stack.clear()
def begin_undo(self, name):
"""
Start of an undo block followed by a
:meth:`NodeGraph.end_undo()`.
Args:
name (str): name for the undo block.
"""
self._undo_stack.beginMacro(name)
def end_undo(self):
"""
End of an undo block started by
:meth:`NodeGraph.begin_undo()`.
"""
self._undo_stack.endMacro()
def context_menu(self):
"""
Returns the node graph root context menu object.
Returns:
Menu: context menu object.
"""
return Menu(self._viewer, self._viewer.context_menu())
def disable_context_menu(self, disabled=True):
"""
Disable/Enable node graph context menu.
Args:
disabled (bool): true to enable context menu.
"""
menu = self._viewer.context_menu()
menu.setDisabled(disabled)
menu.setVisible(not disabled)
def acyclic(self):
"""
Returns true if the current node graph is acyclic.
Returns:
bool: true if acyclic (default: True).
"""
return self._model.acyclic
def set_acyclic(self, mode=False):
"""
Enable the node graph to be a acyclic graph. (default=False)
Args:
mode (bool): true to enable acyclic.
"""
self._model.acyclic = mode
self._viewer.acyclic = mode
def set_pipe_style(self, style=None):
"""
Set node graph pipes to be drawn straight or curved by default
all pipes are set curved. (default=0)
``NodeGraphQt.constants.PIPE_LAYOUT_CURVED`` = 0
``NodeGraphQt.constants.PIPE_LAYOUT_STRAIGHT`` = 1
Args:
style (int): pipe style.
"""
pipe_default = max([PIPE_LAYOUT_CURVED, PIPE_LAYOUT_STRAIGHT])
style = PIPE_LAYOUT_STRAIGHT if style > pipe_default else style
self._viewer.set_pipe_layout(style)
def fit_to_selection(self):
"""
Sets the zoom level to fit selected nodes.
If no nodes are selected then all nodes in the graph will be framed.
"""
nodes = self.selected_nodes() or self.all_nodes()
if not nodes:
return
self._viewer.zoom_to_nodes([n.view for n in nodes])
def reset_zoom(self):
"""
Reset the zoom level
"""
self._viewer.reset_zoom()
def set_zoom(self, zoom=0):
"""
Set the zoom factor of the Node Graph the default is 0.0
Args:
zoom (float): zoom factor (max zoom out -0.9 / max zoom in 2.0)
"""
self._viewer.set_zoom(zoom)
def get_zoom(self):
"""
Get the current zoom level of the node graph.
Returns:
float: the current zoom level.
"""
return self._viewer.get_zoom()
def center_on(self, nodes=None):
"""
Center the node graph on the given nodes or all nodes by default.
Args:
nodes (list[NodeGraphQt.BaseNode]): a list of nodes.
"""
self._viewer.center_selection(nodes)
def center_selection(self):
"""
Centers on the current selected nodes.
"""
nodes = self._viewer.selected_nodes()
self._viewer.center_selection(nodes)
def registered_nodes(self):
"""
Return a list of all node types that have been registered.
To register a node see :meth:`NodeGraph.register_node`
Returns:
list[str]: list of node type identifiers.
"""
return sorted(self._node_factory.nodes.keys())
def register_node(self, node, alias=None):
"""
Register the node to the node graph vendor.
Args:
node (NodeGraphQt.NodeObject): node.
alias (str): custom alias name for the node type.
"""
self._node_factory.register_node(node, alias)
def create_node(self,
node_type,
name=None,
selected=True,
color=None,
text_color=None,
pos=None):
"""
Create a new node in the node graph.
(To list all node types see :meth:`NodeGraph.registered_nodes`)
Args:
node_type (str): node instance type.
name (str): set name of the node.
selected (bool): set created node to be selected.
color (tuple or str): node color (255, 255, 255) or '#FFFFFF'.
text_color (tuple or str): node text color (255, 255, 255) or '#FFFFFF'.
pos (list[int, int]): initial x, y position for the node (default: (0, 0)).
Returns:
NodeGraphQt.BaseNode: the created instance of the node.
"""
NodeCls = self._node_factory.create_node_instance(node_type)
if NodeCls:
node = NodeCls()
node._graph = self
node.model._graph_model = self.model
wid_types = node.model.__dict__.pop('_TEMP_property_widget_types')
prop_attrs = node.model.__dict__.pop('_TEMP_property_attrs')
if self.model.get_node_common_properties(node.type_) is None:
node_attrs = {
node.type_:
{n: {
'widget_type': wt
}
for n, wt in wid_types.items()}
}
for pname, pattrs in prop_attrs.items():
node_attrs[node.type_][pname].update(pattrs)
self.model.set_node_common_properties(node_attrs)
node.NODE_NAME = self.get_unique_name(name or node.NODE_NAME)
node.model.name = node.NODE_NAME
node.model.selected = selected
def format_color(clr):
if isinstance(clr, str):
clr = clr.strip('#')
return tuple(int(clr[i:i + 2], 16) for i in (0, 2, 4))
return clr
if color:
node.model.color = format_color(color)
if text_color:
node.model.text_color = format_color(text_color)
if pos:
node.model.pos = [float(pos[0]), float(pos[1])]
node.update()
undo_cmd = NodeAddedCmd(self, node, node.model.pos)
undo_cmd.setText('create node: "{}"'.format(node.NODE_NAME))
self._undo_stack.push(undo_cmd)
self.node_created.emit(node)
return node
raise Exception('\n\n>> Cannot find node:\t"{}"\n'.format(node_type))
def add_node(self, node, pos=None):
"""
Add a node into the node graph.
Args:
node (NodeGraphQt.BaseNode): node object.
pos (list[float]): node x,y position. (optional)
"""
assert isinstance(node, NodeObject), 'node must be a Node instance.'
wid_types = node.model.__dict__.pop('_TEMP_property_widget_types')
prop_attrs = node.model.__dict__.pop('_TEMP_property_attrs')
if self.model.get_node_common_properties(node.type_) is None:
node_attrs = {
node.type_:
{n: {
'widget_type': wt
}
for n, wt in wid_types.items()}
}
for pname, pattrs in prop_attrs.items():
node_attrs[node.type_][pname].update(pattrs)
self.model.set_node_common_properties(node_attrs)
node._graph = self
node.NODE_NAME = self.get_unique_name(node.NODE_NAME)
node.model._graph_model = self.model
node.model.name = node.NODE_NAME
node.update()
self._undo_stack.push(NodeAddedCmd(self, node, pos))
def delete_node(self, node):
"""
Remove the node from the node graph.
Args:
node (NodeGraphQt.BaseNode): node object.
"""
assert isinstance(node, NodeObject), \
'node must be a instance of a NodeObject.'
self.nodes_deleted.emit([node.id])
self._undo_stack.push(NodeRemovedCmd(self, node))
def delete_nodes(self, nodes):
"""
Remove a list of specified nodes from the node graph.
Args:
nodes (list[NodeGraphQt.BaseNode]): list of node instances.
"""
self.nodes_deleted.emit([n.id for n in nodes])
self._undo_stack.beginMacro('delete nodes')
[self._undo_stack.push(NodeRemovedCmd(self, n)) for n in nodes]
self._undo_stack.endMacro()
def all_nodes(self):
"""
Return all nodes in the node graph.
Returns:
list[NodeGraphQt.BaseNode]: list of nodes.
"""
return list(self._model.nodes.values())
def selected_nodes(self):
"""
Return all selected nodes that are in the node graph.
Returns:
list[NodeGraphQt.BaseNode]: list of nodes.
"""
nodes = []
for item in self._viewer.selected_nodes():
node = self._model.nodes[item.id]
nodes.append(node)
return nodes
def select_all(self):
"""
Select all nodes in the node graph.
"""
self._undo_stack.beginMacro('select all')
for node in self.all_nodes():
node.set_selected(True)
self._undo_stack.endMacro()
def clear_selection(self):
"""
Clears the selection in the node graph.
"""
self._undo_stack.beginMacro('clear selection')
for node in self.all_nodes():
node.set_selected(False)
self._undo_stack.endMacro()
def get_node_by_id(self, node_id=None):
"""
Returns the node from the node id string.
Args:
node_id (str): node id (:meth:`NodeObject.id`)
Returns:
NodeGraphQt.NodeObject: node object.
"""
return self._model.nodes.get(node_id)
def get_node_by_name(self, name):
"""
Returns node that matches the name.
Args:
name (str): name of the node.
Returns:
NodeGraphQt.NodeObject: node object.
"""
for node_id, node in self._model.nodes.items():
if node.name() == name:
return node
def get_unique_name(self, name):
"""
Creates a unique node name to avoid having nodes with the same name.
Args:
name (str): node name.
Returns:
str: unique node name.
"""
name = ' '.join(name.split())
node_names = [n.name() for n in self.all_nodes()]
if name not in node_names:
return name
regex = re.compile('[\w ]+(?: )*(\d+)')
search = regex.search(name)
if not search:
for x in range(1, len(node_names) + 1):
new_name = '{} {}'.format(name, x)
if new_name not in node_names:
return new_name
version = search.group(1)
name = name[:len(version) * -1].strip()
for x in range(1, len(node_names) + 1):
new_name = '{} {}'.format(name, x)
if new_name not in node_names:
return new_name
def current_session(self):
"""
Returns the file path to the currently loaded session.
Returns:
str: path to the currently loaded session
"""
return self._model.session
def clear_session(self):
"""
Clears the current node graph session.
"""
for n in self.all_nodes():
self._undo_stack.push(NodeRemovedCmd(self, n))
self._undo_stack.clear()
self._model.session = None
def _serialize(self, nodes):
"""
serialize nodes to a dict.
(used internally by the node graph)
Args:
nodes (list[NodeGraphQt.Nodes]): list of node instances.
Returns:
dict: serialized data.
"""
serial_data = {'nodes': {}, 'connections': []}
nodes_data = {}
for n in nodes:
# update the node model.
n.update_model()
nodes_data.update(n.model.to_dict)
for n_id, n_data in nodes_data.items():
serial_data['nodes'][n_id] = n_data
inputs = n_data.pop('inputs') if n_data.get('inputs') else {}
outputs = n_data.pop('outputs') if n_data.get('outputs') else {}
for pname, conn_data in inputs.items():
for conn_id, prt_names in conn_data.items():
for conn_prt in prt_names:
pipe = {
'in': [n_id, pname],
'out': [conn_id, conn_prt]
}
if pipe not in serial_data['connections']:
serial_data['connections'].append(pipe)
for pname, conn_data in outputs.items():
for conn_id, prt_names in conn_data.items():
for conn_prt in prt_names:
pipe = {
'out': [n_id, pname],
'in': [conn_id, conn_prt]
}
if pipe not in serial_data['connections']:
serial_data['connections'].append(pipe)
if not serial_data['connections']:
serial_data.pop('connections')
return serial_data
def _deserialize(self, data, relative_pos=False, pos=None):
"""
deserialize node data.
(used internally by the node graph)
Args:
data (dict): node data.
relative_pos (bool): position node relative to the cursor.
Returns:
list[NodeGraphQt.Nodes]: list of node instances.
"""
nodes = {}
# build the nodes.
for n_id, n_data in data.get('nodes', {}).items():
identifier = n_data['type_']
NodeCls = self._node_factory.create_node_instance(identifier)
if NodeCls:
node = NodeCls()
node.NODE_NAME = n_data.get('name', node.NODE_NAME)
# set properties.
for prop in node.model.properties.keys():
if prop in n_data.keys():
node.model.set_property(prop, n_data[prop])
# set custom properties.
for prop, val in n_data.get('custom', {}).items():
node.model.set_property(prop, val)
nodes[n_id] = node
self.add_node(node, n_data.get('pos'))
# build the connections.
for connection in data.get('connections', []):
nid, pname = connection.get('in', ('', ''))
in_node = nodes.get(nid)
if not in_node:
continue
in_port = in_node.inputs().get(pname) if in_node else None
nid, pname = connection.get('out', ('', ''))
out_node = nodes.get(nid)
if not out_node:
continue
out_port = out_node.outputs().get(pname) if out_node else None
if in_port and out_port:
self._undo_stack.push(PortConnectedCmd(in_port, out_port))
node_objs = list(nodes.values())
if relative_pos:
self._viewer.move_nodes([n.view for n in node_objs])
[setattr(n.model, 'pos', n.view.xy_pos) for n in node_objs]
elif pos:
self._viewer.move_nodes([n.view for n in node_objs], pos=pos)
[setattr(n.model, 'pos', n.view.xy_pos) for n in node_objs]
return node_objs
def serialize_session(self):
"""
Serializes the current node graph layout to a dictionary.
Returns:
dict: serialized session of the current node layout.
"""
return self._serialize(self.all_nodes())
def deserialize_session(self, layout_data):
"""
Load node graph session from a dictionary object.
Args:
layout_data (dict): dictionary object containing a node session.
"""
self.clear_session()
self._deserialize(layout_data)
self._undo_stack.clear()
def save_session(self, file_path):
"""
Saves the current node graph session layout to a `JSON` formatted file.
Args:
file_path (str): path to the saved node layout.
"""
serliazed_data = self._serialize(self.all_nodes())
file_path = file_path.strip()
with open(file_path, 'w') as file_out:
json.dump(serliazed_data,
file_out,
indent=2,
separators=(',', ':'))
def load_session(self, file_path):
"""
Load node graph session layout file.
Args:
file_path (str): path to the serialized layout file.
"""
file_path = file_path.strip()
if not os.path.isfile(file_path):
raise IOError('file does not exist.')
self.clear_session()
try:
with open(file_path) as data_file:
layout_data = json.load(data_file)
except Exception as e:
layout_data = None
print('Cannot read data from file.\n{}'.format(e))
if not layout_data:
return
self._deserialize(layout_data)
self._undo_stack.clear()
self._model.session = file_path
def copy_nodes(self, nodes=None):
"""
Copy nodes to the clipboard.
Args:
nodes (list[NodeGraphQt.BaseNode]): list of nodes (default: selected nodes).
"""
nodes = nodes or self.selected_nodes()
if not nodes:
return False
clipboard = QtWidgets.QApplication.clipboard()
serial_data = self._serialize(nodes)
serial_str = json.dumps(serial_data)
if serial_str:
clipboard.setText(serial_str)
return True
return False
def paste_nodes(self):
"""
Pastes nodes copied from the clipboard.
"""
clipboard = QtWidgets.QApplication.clipboard()
cb_text = clipboard.text()
if not cb_text:
return
self._undo_stack.beginMacro('pasted nodes')
serial_data = json.loads(cb_text)
self.clear_selection()
nodes = self._deserialize(serial_data, relative_pos=True)
[n.set_selected(True) for n in nodes]
self._undo_stack.endMacro()
def duplicate_nodes(self, nodes):
"""
Create duplicate copy from the list of nodes.
Args:
nodes (list[NodeGraphQt.BaseNode]): list of nodes.
Returns:
list[NodeGraphQt.BaseNode]: list of duplicated node instances.
"""
if not nodes:
return
self._undo_stack.beginMacro('duplicate nodes')
self.clear_selection()
serial = self._serialize(nodes)
new_nodes = self._deserialize(serial)
offset = 50
for n in new_nodes:
x, y = n.pos()
n.set_pos(x + offset, y + offset)
n.set_property('selected', True)
self._undo_stack.endMacro()
return new_nodes
def disable_nodes(self, nodes, mode=None):
"""
Set weather to Disable or Enable specified nodes.
see: :meth:`NodeObject.set_disabled`
Args:
nodes (list[NodeGraphQt.BaseNode]): list of node instances.
mode (bool): (optional) disable state of the nodes.
"""
if not nodes:
return
if mode is None:
mode = not nodes[0].disabled()
if len(nodes) > 1:
text = {False: 'enable', True: 'disable'}[mode]
text = '{} ({}) nodes'.format(text, len(nodes))
self._undo_stack.beginMacro(text)
[n.set_disabled(mode) for n in nodes]
self._undo_stack.endMacro()
return
nodes[0].set_disabled(mode)
def question_dialog(self, text, title='Node Graph'):
"""
Prompts a question open dialog with "Yes" and "No" buttons in
the node graph.
(convenience function to :meth:`NodeGraph.viewer().question_dialog`)
Args:
text (str): question text.
title (str): dialog window title.
Returns:
bool: true if user clicked yes.
"""
self._viewer.question_dialog(text, title)
def message_dialog(self, text, title='Node Graph'):
"""
Prompts a file open dialog in the node graph.
(convenience function to :meth:`NodeGraph.viewer().message_dialog`)
Args:
text (str): message text.
title (str): dialog window title.
"""
self._viewer.message_dialog(text, title)
def load_dialog(self, current_dir=None, ext=None):
"""
Prompts a file open dialog in the node graph.
(convenience function to :meth:`NodeGraph.viewer().load_dialog`)
Args:
current_dir (str): path to a directory.
ext (str): custom file type extension (default: json)
Returns:
str: selected file path.
"""
return self._viewer.load_dialog(current_dir, ext)
def save_dialog(self, current_dir=None, ext=None):
"""
Prompts a file save dialog in the node graph.
(convenience function to :meth:`NodeGraph.viewer().save_dialog`)
Args:
current_dir (str): path to a directory.
ext (str): custom file type extension (default: json)
Returns:
str: selected file path.
"""
return self._viewer.save_dialog(current_dir, ext)
class NodeGraph(QtCore.QObject):
def __init__(self, parent=None):
super(NodeGraph, self).__init__(parent)
self._model = NodeGraphModel()
self._viewer = NodeViewer()
self._undo_stack = QUndoStack(self)
self._init_actions()
self._wire_signals()
def _wire_signals(self):
self._viewer.moved_nodes.connect(self._on_nodes_moved)
self._viewer.search_triggered.connect(self._on_search_triggered)
self._viewer.connection_changed.connect(self._on_connection_changed)
def _init_actions(self):
# setup tab search shortcut.
tab = QAction('Search Nodes', self)
tab.setShortcut('tab')
tab.triggered.connect(self._toggle_tab_search)
self._viewer.addAction(tab)
setup_actions(self)
def _toggle_tab_search(self):
"""
toggle the tab search widget.
"""
self._viewer.tab_search_set_nodes(NodeVendor.names)
self._viewer.tab_search_toggle()
def _on_nodes_moved(self, node_data):
"""
called when selected nodes in the viewer has changed position.
Args:
node_data (dict): {<node_view>: <previous_pos>}
"""
self._undo_stack.beginMacro('moved nodes')
for node_view, prev_pos in node_data.items():
node = self._model.nodes[node_view.id]
self._undo_stack.push(NodeMovedCmd(node, node.pos(), prev_pos))
self._undo_stack.endMacro()
def _on_search_triggered(self, node_type, pos):
"""
called when the tab search widget is triggered in the viewer.
Args:
node_type (str): node identifier.
pos (tuple): x,y position for the node.
"""
self.create_node(node_type, pos=pos)
def _on_connection_changed(self, disconnected, connected):
"""
called when a pipe connection has been changed in the viewer.
Args:
disconnected (list[list[widgets.port.PortItem]):
pair list of port view items.
connected (list[list[widgets.port.PortItem]]):
pair list of port view items.
"""
if not (disconnected or connected):
return
label = 'connected node(s)' if connected else 'disconnected node(s)'
ptypes = {'in': 'inputs', 'out': 'outputs'}
self._undo_stack.beginMacro(label)
for p1_view, p2_view in disconnected:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.disconnect_from(port2)
for p1_view, p2_view in connected:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.connect_to(port2)
self._undo_stack.endMacro()
@property
def model(self):
"""
Return the node graph model.
Returns:
NodeGraphModel: model object.
"""
return self._model
def show(self):
"""
Show node graph viewer widget.
"""
self._viewer.show()
def hide(self):
"""
Hide node graph viewer widget.
"""
self._viewer.hide()
def close(self):
"""
Close node graph viewer widget.
"""
self._viewer.close()
def viewer(self):
"""
Return the node graph viewer widget object.
Returns:
NodeGraphQt.widgets.viewer.NodeViewer: viewer widget.
"""
return self._viewer
def scene(self):
"""
Return the scene object.
Returns:
NodeGraphQt.widgets.scene.NodeScene: node scene.
"""
return self._viewer.scene()
def undo_stack(self):
"""
Returns the undo stack used in the node graph
Returns:
QUndoStack: undo stack.
"""
return self._undo_stack
def begin_undo(self, name='undo'):
"""
Start of an undo block followed by a end_undo().
Args:
name (str): name for the undo block.
"""
self._undo_stack.beginMacro(name)
def end_undo(self):
"""
End of an undo block started by begin_undo().
"""
self._undo_stack.endMacro()
def context_menu(self):
"""
Returns a node graph context menu object.
Returns:
ContextMenu: node graph context menu object instance.
"""
return self._viewer.context_menu()
def acyclic(self):
"""
Returns true if the current node graph is acyclic.
Returns:
bool: true if acyclic.
"""
return self._model.acyclic
def set_acyclic(self, mode=True):
"""
Set the node graph to be acyclic or not. (default=True)
Args:
mode (bool): false to disable acyclic.
"""
self._model.acyclic = mode
self._viewer.acyclic = mode
def set_pipe_layout(self, layout='curved'):
"""
Set node graph pipes to be drawn straight or curved by default
all pipes are set curved. (default='curved')
Args:
layout (str): 'straight' or 'curved'
"""
self._viewer.set_pipe_layout(layout)
def fit_to_selection(self):
"""
Sets the zoom level to fit selected nodes.
If no nodes are selected then all nodes in the graph will be framed.
"""
nodes = self.selected_nodes() or self.all_nodes()
if not nodes:
return
self._viewer.zoom_to_nodes([n.view for n in nodes])
def reset_zoom(self):
"""
Reset the zoom level
"""
self._viewer.reset_zoom()
def set_zoom(self, zoom=0):
"""
Set the zoom factor of the Node Graph the default is 0.0
Args:
zoom (float): zoom factor max zoom out -0.9 max zoom in 2.0
"""
self._viewer.set_zoom(zoom)
def get_zoom(self):
"""
Get the current zoom level of the node graph.
Returns:
float: the current zoom level.
"""
return self._viewer.get_zoom()
def center_on(self, nodes=None):
"""
Center the node graph on the given nodes or all nodes by default.
Args:
nodes (list[NodeGraphQt.Node]): a list of nodes.
"""
self._viewer.center_selection(nodes)
def center_selection(self):
"""
Center the node graph on the current selected nodes.
"""
nodes = self._viewer.selected_nodes()
self._viewer.center_selection(nodes)
def registered_nodes(self):
"""
Return a list of all node types that have been registered.
To register a node see "NodeGraphWidget.register_node()"
Returns:
list[str]: node types.
"""
return sorted(NodeVendor.nodes.keys())
def register_node(self, node, alias=None):
"""
Register a node.
Args:
node (NodeGraphQt.Node): node object.
alias (str): custom alias name for the node type.
"""
NodeVendor.register_node(node, alias)
def create_node(self,
node_type,
name=None,
selected=True,
color=None,
pos=None):
"""
Create a new node in the node graph.
To list all node types see "NodeGraphWidget.registered_nodes()"
Args:
node_type (str): node instance type.
name (str): set name of the node.
selected (bool): set created node to be selected.
color (tuple or str): node color (255, 255, 255) or '#FFFFFF'.
pos (tuple): set position of the node (x, y).
Returns:
NodeGraphQt.Node: created instance of a node.
"""
NodeInstance = NodeVendor.create_node_instance(node_type)
if NodeInstance:
node = NodeInstance()
node._graph = self
node.update()
self._undo_stack.beginMacro('created node')
self._undo_stack.push(NodeAddedCmd(self, node, pos))
if name:
node.set_name(name)
else:
node.set_name(node.NODE_NAME)
if color:
if isinstance(color, str):
color = color[1:] if color[0] is '#' else color
color = tuple(int(color[i:i + 2], 16) for i in (0, 2, 4))
node.set_color(*color)
node.set_selected(selected)
self._undo_stack.endMacro()
return node
raise Exception('\n\n>> Cannot find node:\t"{}"\n'.format(node_type))
def add_node(self, node):
"""
Add a node into the node graph.
Args:
node (NodeGraphQt.Node): node object.
"""
assert isinstance(node, NodeObject), 'node must be a Node instance.'
node._graph = self
node.NODE_NAME = self.get_unique_name(node.NODE_NAME)
node.model.name = node.NODE_NAME
node.update()
self._undo_stack.push(NodeAddedCmd(self, node))
def delete_node(self, node):
"""
Remove the node from the node graph.
Args:
node (NodeGraphQt.Node): node object.
"""
assert isinstance(node, NodeObject), \
'node must be a instance of a NodeObject.'
self._undo_stack.push(NodeRemovedCmd(self, node))
def delete_nodes(self, nodes):
"""
Remove a list of nodes from the node graph.
Args:
nodes (list[NodeGraphQt.Node]): list of node instances.
"""
self._undo_stack.beginMacro('deleted nodes')
[self.delete_node(n) for n in nodes]
self._undo_stack.endMacro()
def all_nodes(self):
"""
Return all nodes in the node graph.
Returns:
list[NodeGraphQt.Node]: list of nodes.
"""
return list(self._model.nodes.values())
def selected_nodes(self):
"""
Return all selected nodes that are in the node graph.
Returns:
list[NodeGraphQt.Node]: list of nodes.
"""
nodes = []
for item in self._viewer.selected_nodes():
node = self._model.nodes[item.id]
nodes.append(node)
return nodes
def select_all(self):
"""
Select all nodes in the current node graph.
"""
self._undo_stack.beginMacro('select all')
for node in self.all_nodes():
node.set_selected(True)
self._undo_stack.endMacro()
def clear_selection(self):
"""
Clears the selection in the node graph.
"""
self._undo_stack.beginMacro('deselected nodes')
for node in self.all_nodes():
node.set_selected(False)
self._undo_stack.endMacro()
def get_node_by_id(self, node_id=None):
"""
Get the node object by it's id.
Args:
node_id (str): node id
Returns:
NodeGraphQt.NodeObject: node object.
"""
return self._model.nodes.get(node_id)
def get_node_by_name(self, name):
"""
Returns node object that matches the name.
Args:
name (str): name of the node.
Returns:
NodeGraphQt.Node: node object.
"""
for node_id, node in self._model.nodes.items():
if node.name() == name:
return node
def get_unique_name(self, name):
"""
return a unique node name for the node.
Args:
name (str): node name.
Returns:
str: unique node name.
"""
name = ' '.join(name.split())
node_names = [n.name() for n in self.all_nodes()]
if name not in node_names:
return name
regex = re.compile('[\w ]+(?: )*(\d+)')
search = regex.search(name)
if not search:
for x in range(1, len(node_names) + 1):
new_name = '{} {}'.format(name, x)
if new_name not in node_names:
return new_name
version = search.group(1)
name = name[:len(version) * -1].strip()
for x in range(1, len(node_names) + 1):
new_name = '{} {}'.format(name, x)
if new_name not in node_names:
return new_name
def current_session(self):
"""
returns the file path to the currently loaded session.
Returns:
str: path to the currently loaded session
"""
return self._model.session
def clear_session(self):
"""
clear the loaded node layout session.
"""
for n in self.all_nodes():
self.delete_node(n)
self._undo_stack.clear()
self._model.session = None
def _serialize(self, nodes):
"""
serialize nodes to a dict.
Args:
nodes (list[NodeGraphQt.Nodes]): list of node instances.
Returns:
dict: serialized data.
"""
serial_data = {'nodes': {}, 'connections': []}
nodes_data = {}
for n in nodes:
# update the node model.
n.update_model()
nodes_data.update(n.model.to_dict)
for n_id, n_data in nodes_data.items():
serial_data['nodes'][n_id] = n_data
inputs = n_data.pop('inputs') if n_data.get('inputs') else {}
outputs = n_data.pop('outputs') if n_data.get('outputs') else {}
for pname, conn_data in inputs.items():
for conn_id, prt_names in conn_data.items():
for conn_prt in prt_names:
pipe = {
'in': [n_id, pname],
'out': [conn_id, conn_prt]
}
if pipe not in serial_data['connections']:
serial_data['connections'].append(pipe)
for pname, conn_data in outputs.items():
for conn_id, prt_names in conn_data.items():
for conn_prt in prt_names:
pipe = {
'out': [n_id, pname],
'in': [conn_id, conn_prt]
}
if pipe not in serial_data['connections']:
serial_data['connections'].append(pipe)
if not serial_data['connections']:
serial_data.pop('connections')
return serial_data
def _deserialize(self, data, relative_pos=False, pos=None):
"""
deserialize node data.
Args:
data (dict): node data.
relative_pos (bool): position node relative to the cursor.
Returns:
list[NodeGraphQt.Nodes]: list of node instances.
"""
nodes = {}
# build the nodes.
for n_id, n_data in data.get('nodes', {}).items():
identifier = n_data['type']
NodeInstance = NodeVendor.create_node_instance(identifier)
if NodeInstance:
node = NodeInstance()
node._graph = self
name = self.get_unique_name(n_data.get('name', node.NODE_NAME))
n_data['name'] = name
# set properties.
for prop, val in node.model.properties.items():
if prop in n_data.keys():
setattr(node.model, prop, n_data[prop])
# set custom properties.
for prop, val in n_data.get('custom', {}).items():
if prop in node.model.custom_properties.keys():
node.model.custom_properties[prop] = val
node.update()
self._undo_stack.push(
NodeAddedCmd(self, node, n_data.get('pos')))
nodes[n_id] = node
# build the connections.
for connection in data.get('connections', []):
nid, pname = connection.get('in', ('', ''))
in_node = nodes.get(nid)
if not in_node:
continue
in_port = in_node.inputs().get(pname) if in_node else None
nid, pname = connection.get('out', ('', ''))
out_node = nodes.get(nid)
if not out_node:
continue
out_port = out_node.outputs().get(pname) if out_node else None
if in_port and out_port:
self._undo_stack.push(PortConnectedCmd(in_port, out_port))
node_objs = list(nodes.values())
if relative_pos:
self._viewer.move_nodes([n.view for n in node_objs])
[setattr(n.model, 'pos', n.view.pos) for n in node_objs]
elif pos:
self._viewer.move_nodes([n.view for n in node_objs], pos=pos)
return node_objs
def save_session(self, file_path):
"""
Saves the current node graph session layout to a JSON formatted file.
Args:
file_path (str): path to the saved node layout.
"""
serliazed_data = self._serialize(self.selected_nodes())
file_path = file_path.strip()
with open(file_path, 'w') as file_out:
json.dump(serliazed_data,
file_out,
indent=2,
separators=(',', ':'))
def load_session(self, file_path):
"""
Load node graph session layout file.
Args:
file_path (str): path to the serialized layout file.
"""
file_path = file_path.strip()
if not os.path.isfile(file_path):
raise IOError('file does not exist.')
self.clear_session()
try:
with open(file_path) as data_file:
layout_data = json.load(data_file)
except Exception as e:
layout_data = None
print('Cannot read data from file.\n{}'.format(e))
if not layout_data:
return
self._deserialize(layout_data)
self._undo_stack.clear()
self._model.session = file_path
def copy_nodes(self, nodes=None):
"""
copy nodes to the clipboard by default this method copies
the selected nodes from the node graph.
Args:
nodes (list[NodeGraphQt.Node]): list of node instances.
"""
nodes = nodes or self.selected_nodes()
if not nodes:
return False
clipboard = QClipboard()
serial_data = self._serialize(nodes)
serial_str = json.dumps(serial_data)
if serial_str:
clipboard.setText(serial_str)
return True
return False
def paste_nodes(self):
"""
Pastes nodes from the clipboard.
"""
clipboard = QClipboard()
cb_string = clipboard.text()
if not cb_string:
return
self._undo_stack.beginMacro('pasted nodes')
serial_data = json.loads(cb_string)
self.clear_selection()
nodes = self._deserialize(serial_data, True)
[n.set_selected(True) for n in nodes]
self._undo_stack.endMacro()
def duplicate_nodes(self, nodes):
"""
Create duplicates nodes.
Args:
nodes (list[NodeGraphQt.Node]): list of node objects.
Returns:
list[NodeGraphQt.Node]: list of duplicated node instances.
"""
if not nodes:
return
self._undo_stack.beginMacro('duplicated nodes')
self.clear_selection()
serial = self._serialize(nodes)
new_nodes = self._deserialize(serial)
offset = 50
for n in new_nodes:
x, y = n.pos()
n.set_pos(x + offset, y + offset)
n.set_property('selected', True)
self._undo_stack.endMacro()
return new_nodes
def disable_nodes(self, nodes, mode=None):
"""
Disable/Enable specified nodes.
Args:
nodes (list[NodeGraphQt.Node]): list of node instances.
mode (bool): (optional) disable state of the nodes.
"""
if not nodes:
return
if mode is None:
mode = not nodes[0].disabled()
if len(nodes) > 1:
text = {False: 'enabled', True: 'disabled'}[mode]
text = '{} ({}) nodes'.format(text, len(nodes))
self._undo_stack.beginMacro(text)
[n.set_disabled(mode) for n in nodes]
self._undo_stack.endMacro()
return
nodes[0].set_disabled(mode)
class NodeGraph(QtCore.QObject):
node_selected = QtCore.Signal(list)
def __init__(self, parent=None):
super(NodeGraph, self).__init__(parent)
self._model = NodeGraphModel()
self._viewer = NodeViewer()
self._undo_stack = QUndoStack(self)
self._init_actions()
self._wire_signals()
self.patch_context_menu()
def _wire_signals(self):
self._viewer.moved_nodes.connect(self._on_nodes_moved)
self._viewer.search_triggered.connect(self._on_search_triggered)
self._viewer.connection_changed.connect(self._on_connection_changed)
self._viewer.node_selected.connect(self._on_node_selected)
def _init_actions(self):
# setup tab search shortcut.
tab = QAction('Search Nodes', self)
tab.setShortcut('tab')
tab.triggered.connect(self._toggle_tab_search)
self._viewer.addAction(tab)
setup_actions(self)
def _toggle_tab_search(self):
"""
toggle the tab search widget.
"""
self._viewer.tab_search_set_nodes(NodeVendor.names)
self._viewer.tab_search_toggle()
def _on_nodes_moved(self, node_data):
"""
called when selected nodes in the viewer has changed position.
Args:
node_data (dict): {<node_view>: <previous_pos>}
"""
self._undo_stack.beginMacro('moved nodes')
for node_view, prev_pos in node_data.items():
node = self._model.nodes[node_view.id]
self._undo_stack.push(NodeMovedCmd(node, node.pos(), prev_pos))
self._undo_stack.endMacro()
def _on_nodes_moved(self, node_data):
"""
called when a node in the viewer is selected on left click.
"""
nodes = self.selected_nodes()
self.node_selected.emit(nodes)
def _on_search_triggered(self, node_type, pos):
"""
called when the tab search widget is triggered in the viewer.
Args:
node_type (str): node identifier.
pos (tuple): x,y position for the node.
"""
self.create_node(node_type, pos=pos)
def _on_connection_changed(self, disconnected, connected):
"""
called when a pipe connection has been changed in the viewer.
Args:
disconnected (list[list[widgets.port.PortItem]):
pair list of port view items.
connected (list[list[widgets.port.PortItem]]):
pair list of port view items.
"""
if not (disconnected or connected):
return
label = 'connected node(s)' if connected else 'disconnected node(s)'
ptypes = {'in': 'inputs', 'out': 'outputs'}
self._undo_stack.beginMacro(label)
for p1_view, p2_view in disconnected:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.disconnect_from(port2)
for p1_view, p2_view in connected:
node1 = self._model.nodes[p1_view.node.id]
node2 = self._model.nodes[p2_view.node.id]
port1 = getattr(node1, ptypes[p1_view.port_type])()[p1_view.name]
port2 = getattr(node2, ptypes[p2_view.port_type])()[p2_view.name]
port1.connect_to(port2)
self._undo_stack.endMacro()
@property
def model(self):
"""
Return the node graph model.
Returns:
NodeGraphModel: model object.
"""
return self._model
def show(self):
"""
Show node graph viewer widget.
"""
self._viewer.show()
def hide(self):
"""
Hide node graph viewer widget.
"""
self._viewer.hide()
def close(self):
"""
Close node graph viewer widget.
"""
self._viewer.close()
def viewer(self):
"""
Return the node graph viewer widget object.
Returns:
NodeGraphQt.widgets.viewer.NodeViewer: viewer widget.
"""
return self._viewer
def scene(self):
"""
Return the scene object.
Returns:
NodeGraphQt.widgets.scene.NodeScene: node scene.
"""
return self._viewer.scene()
def undo_stack(self):
"""
Returns the undo stack used in the node graph
Returns:
QUndoStack: undo stack.
"""
return self._undo_stack
def begin_undo(self, name='undo'):
"""
Start of an undo block followed by a end_undo().
Args:
name (str): name for the undo block.
"""
self._undo_stack.beginMacro(name)
def end_undo(self):
"""
End of an undo block started by begin_undo().
"""
self._undo_stack.endMacro()
def context_menu(self):
"""
Returns a node graph context menu object.
Returns:
ContextMenu: node graph context menu object instance.
"""
return self._viewer.context_menu()
@staticmethod
def modify_context_menu(viewer):
