class Scene(Serializable):
"""Class representing NodeEditor's `Scene`"""
def __init__(self):
"""
:Instance Attributes:
- **nodes** - list of `Nodes` in this `Scene`
- **edges** - list of `Edges` in this `Scene`
- **history** - Instance of :class:`~nodeeditor.node_scene_history.SceneHistory`
- **clipboard** - Instance of :class:`~nodeeditor.node_scene_clipboard.SceneClipboard`
- **scene_width** - width of this `Scene` in pixels
- **scene_height** - height of this `Scene` in pixels
"""
super().__init__()
self.nodes = []
self.edges = []
self.scene_width = 64000
self.scene_height = 64000
self._has_been_modified = False
self._last_selected_items = []
# initialiaze all listeners
self._has_been_modified_listeners = []
self._item_selected_listeners = []
self._items_deselected_listeners = []
# here we can store callback for retrieving the class for Nodes
self.node_class_selector = None
self.initUI()
self.history = SceneHistory(self)
self.clipboard = SceneClipboard(self)
self.grScene.itemSelected.connect(self.onItemSelected)
self.grScene.itemsDeselected.connect(self.onItemsDeselected)
@property
def has_been_modified(self):
"""
Has this `Scene` been modified?
:getter: ``True`` if the `Scene` has been modified
:setter: set new state. Triggers `Has Been Modified` event
:type: ``bool``
"""
return self._has_been_modified
@has_been_modified.setter
def has_been_modified(self, value):
if not self._has_been_modified and value:
# set it now, because we will be reading it soon
self._has_been_modified = value
# call all registered listeners
for callback in self._has_been_modified_listeners:
callback()
self._has_been_modified = value
def initUI(self):
"""Set up Graphics Scene Instance"""
self.grScene = QDMGraphicsScene(self)
self.grScene.setGrScene(self.scene_width, self.scene_height)
def onItemSelected(self):
"""Handle Item selection and trigger event `Item Selected`"""
current_selected_items = self.getSelectedItems()
if current_selected_items != self._last_selected_items:
self._last_selected_items = current_selected_items
self.history.storeHistory("Selection Changed")
for callback in self._item_selected_listeners:
callback()
def onItemsDeselected(self):
"""Handle Items deselection and trigger event `Items Deselected`"""
self.resetLastSelectedStates()
if self._last_selected_items != []:
self._last_selected_items = []
self.history.storeHistory("Deselected Everything")
for callback in self._items_deselected_listeners:
callback()
def isModified(self) -> bool:
"""Is this `Scene` dirty aka `has been modified` ?
:return: ``True`` if `Scene` has been modified
:rtype: ``bool``
"""
return self.has_been_modified
def getSelectedItems(self) -> list:
"""
Returns currently selected Graphics Items
:return: list of ``QGraphicsItems``
:rtype: list[QGraphicsItem]
"""
return self.grScene.selectedItems()
# our helper listener functions
def addHasBeenModifiedListener(self, callback: 'function'):
"""
Register callback for `Has Been Modified` event
:param callback: callback function
"""
self._has_been_modified_listeners.append(callback)
def addItemSelectedListener(self, callback: 'function'):
"""
Register callback for `Item Selected` event
:param callback: callback function
"""
self._item_selected_listeners.append(callback)
def addItemsDeselectedListener(self, callback: 'function'):
"""
Register callback for `Items Deselected` event
:param callback: callback function
"""
self._items_deselected_listeners.append(callback)
def addDragEnterListener(self, callback: 'function'):
"""
Register callback for `Drag Enter` event
:param callback: callback function
"""
self.getView().addDragEnterListener(callback)
def addDropListener(self, callback: 'function'):
"""
Register callback for `Drop` event
:param callback: callback function
"""
self.getView().addDropListener(callback)
# custom flag to detect node or edge has been selected....
def resetLastSelectedStates(self):
"""Resets internal `selected flags` in all `Nodes` and `Edges` in the `Scene`"""
for node in self.nodes:
node.grNode._last_selected_state = False
for edge in self.edges:
edge.grEdge._last_selected_state = False
def getView(self) -> 'QGraphicsView':
"""Shortcut for returning `Scene` ``QGraphicsView``
:return: ``QGraphicsView`` attached to the `Scene`
:rtype: ``QGraphicsView``
"""
return self.grScene.views()[0]
def getItemAt(self, pos: 'QPointF'):
"""Shortcut for retrieving item at provided `Scene` position
:param pos: scene position
:type pos: ``QPointF``
:return: Qt Graphics Item at scene position
:rtype: ``QGraphicsItem``
"""
return self.getView().itemAt(pos)
def addNode(self, node: Node):
"""Add :class:`~nodeeditor.node_node.Node` to this `Scene`
:param node: :class:`~nodeeditor.node_node.Node` to be added to this `Scene`
:type node: :class:`~nodeeditor.node_node.Node`
"""
self.nodes.append(node)
def addEdge(self, edge: Edge):
"""Add :class:`~nodeeditor.node_edge.Edge` to this `Scene`
:param edge: :class:`~nodeeditor.node_edge.Edge` to be added to this `Scene`
:return: :class:`~nodeeditor.node_edge.Edge`
"""
self.edges.append(edge)
def removeNode(self, node: Node):
"""Remove :class:`~nodeeditor.node_node.Node` from this `Scene`
:param node: :class:`~nodeeditor.node_node.Node` to be removed from this `Scene`
:type node: :class:`~nodeeditor.node_node.Node`
"""
if node in self.nodes: self.nodes.remove(node)
else:
print("!W:", "Scene::removeNode", "wanna remove node", node,
"from self.nodes but it's not in the list!")
def removeEdge(self, edge: Edge):
"""Remove :class:`~nodeeditor.node_edge.Edge` from this `Scene`
:param edge: :class:`~nodeeditor.node_edge.Edge` to be remove from this `Scene`
:return: :class:`~nodeeditor.node_edge.Edge`
"""
if edge in self.edges: self.edges.remove(edge)
else:
print("!W:", "Scene::removeEdge", "wanna remove edge", edge,
"from self.edges but it's not in the list!")
def clear(self):
"""Remove all `Nodes` from this `Scene`. This causes also to remove all `Edges`"""
while len(self.nodes) > 0:
self.nodes[0].remove()
self.has_been_modified = False
def saveToFile(self, filename: str):
"""
Save this `Scene` to the file on disk.
:param filename: where to save this scene
:type filename: ``str``
"""
with open(filename, "w") as file:
file.write(json.dumps(self.serialize(), indent=4))
print("saving to", filename, "was successfull.")
self.has_been_modified = False
def loadFromFile(self, filename: str):
"""
Load `Scene` from a file on disk
:param filename: from what file to load the `Scene`
:type filename: ``str``
:raises: :class:`~nodeeditor.node_scene.InvalidFile` if there was an error decoding JSON file
"""
with open(filename, "r") as file:
raw_data = file.read()
try:
data = json.loads(raw_data, encoding='utf-8')
self.deserialize(data)
self.has_been_modified = False
except json.JSONDecodeError:
raise InvalidFile("%s is not a valid JSON file" %
os.path.basename(filename))
except Exception as e:
dumpException(e)
def setNodeClassSelector(
self, class_selecting_function: 'functon') -> 'Node class type':
"""
Set the function which decides what `Node` class to instantiate when deserializating `Scene`.
If not set, we will always instantiate :class:`~nodeeditor.node_node.Node` for each `Node` in the `Scene`
:param class_selecting_function: function which returns `Node` class type (not instance) from `Node` serialized ``dict`` data
:type class_selecting_function: ``function``
:return: Class Type of `Node` to be instantiated during deserialization
:rtype: `Node` class type
"""
self.node_class_selector = class_selecting_function
def getNodeClassFromData(self, data: dict) -> 'Node class instance':
"""
Takes `Node` serialized data and determines which `Node Class` to instantiate according the description
in the serialized Node
:param data: serialized `Node` object data
:type data: ``dict``
:return: Instance of `Node` class to be used in this Scene
:rtype: `Node` class instance
"""
return Node if self.node_class_selector is None else self.node_class_selector(
data)
def serialize(self) -> OrderedDict:
nodes, edges = [], []
for node in self.nodes:
nodes.append(node.serialize())
for edge in self.edges:
edges.append(edge.serialize())
return OrderedDict([
('id', self.id),
('scene_width', self.scene_width),
('scene_height', self.scene_height),
('nodes', nodes),
('edges', edges),
])
def deserialize(self,
data: dict,
hashmap: dict = {},
restore_id: bool = True) -> bool:
self.clear()
hashmap = {}
if restore_id: self.id = data['id']
# create nodes
for node_data in data['nodes']:
self.getNodeClassFromData(node_data)(self).deserialize(
node_data, hashmap, restore_id)
# create edges
for edge_data in data['edges']:
Edge(self).deserialize(edge_data, hashmap, restore_id)
return True
class Scene(Serializable):
def __init__(self):
super().__init__()
self.nodes = []
self.edges = []
self.scene_width = 64000
self.scene_height = 64000
self._has_been_modified = False
self._last_selected_items = []
# initialiaze all listeners
self._has_been_modified_listeners = []
self._item_selected_listeners = []
self._items_deselected_listeners = []
# here we can store callback for retrieving the class for Nodes
self.node_class_selector = None
self.initUI()
self.history = SceneHistory(self)
self.clipboard = SceneClipboard(self)
self.grScene.itemSelected.connect(self.onItemSelected)
self.grScene.itemsDeselected.connect(self.onItemsDeselected)
def initUI(self):
self.grScene = QDMGraphicsScene(self)
self.grScene.setGrScene(self.scene_width, self.scene_height)
def onItemSelected(self):
current_selected_items = self.getSelectedItems()
if current_selected_items != self._last_selected_items:
self._last_selected_items = current_selected_items
self.history.storeHistory("Selection Changed")
for callback in self._item_selected_listeners:
callback()
def onItemsDeselected(self):
self.resetLastSelectedStates()
if self._last_selected_items != []:
self._last_selected_items = []
self.history.storeHistory("Deselected Everything")
for callback in self._items_deselected_listeners:
callback()
def isModified(self):
return self.has_been_modified
def getSelectedItems(self):
return self.grScene.selectedItems()
@property
def has_been_modified(self):
return self._has_been_modified
@has_been_modified.setter
def has_been_modified(self, value):
if not self._has_been_modified and value:
# set it now, because we will be reading it soon
self._has_been_modified = value
# call all registered listeners
for callback in self._has_been_modified_listeners:
callback()
self._has_been_modified = value
# our helper listener functions
def addHasBeenModifiedListener(self, callback):
self._has_been_modified_listeners.append(callback)
def addItemSelectedListener(self, callback):
self._item_selected_listeners.append(callback)
def addItemsDeselectedListener(self, callback):
self._items_deselected_listeners.append(callback)
def addDragEnterListener(self, callback):
self.getView().addDragEnterListener(callback)
def addDropListener(self, callback):
self.getView().addDropListener(callback)
# custom flag to detect node or edge has been selected....
def resetLastSelectedStates(self):
for node in self.nodes:
node.grNode._last_selected_state = False
for edge in self.edges:
edge.grEdge._last_selected_state = False
def getView(self):
return self.grScene.views()[0]
def getItemAt(self, pos):
return self.getView().itemAt(pos)
def addNode(self, node):
self.nodes.append(node)
def addEdge(self, edge):
self.edges.append(edge)
def removeNode(self, node):
if node in self.nodes: self.nodes.remove(node)
else:
print("!W:", "Scene::removeNode", "wanna remove node", node,
"from self.nodes but it's not in the list!")
def removeEdge(self, edge):
if edge in self.edges: self.edges.remove(edge)
else:
print("!W:", "Scene::removeEdge", "wanna remove edge", edge,
"from self.edges but it's not in the list!")
def clear(self):
while len(self.nodes) > 0:
self.nodes[0].remove()
self.has_been_modified = False
def saveToFile(self, filename):
with open(filename, "w") as file:
file.write(json.dumps(self.serialize(), indent=4))
print("saving to", filename, "was successfull.")
self.has_been_modified = False
def loadFromFile(self, filename):
with open(filename, "r") as file:
raw_data = file.read()
try:
data = json.loads(raw_data, encoding='utf-8')
self.deserialize(data)
self.has_been_modified = False
except json.JSONDecodeError:
raise InvalidFile("%s is not a valid JSON file" %
os.path.basename(filename))
except Exception as e:
dumpException(e)
def setNodeClassSelector(self, class_selecting_function):
""" When the function self.node_class_selector is set, we can use different Node Classes """
self.node_class_selector = class_selecting_function
def getNodeClassFromData(self, data):
return Node if self.node_class_selector is None else self.node_class_selector(
data)
def serialize(self):
nodes, edges = [], []
for node in self.nodes:
nodes.append(node.serialize())
for edge in self.edges:
edges.append(edge.serialize())
return OrderedDict([
('id', self.id),
('scene_width', self.scene_width),
('scene_height', self.scene_height),
('nodes', nodes),
('edges', edges),
])
def deserialize(self, data, hashmap={}, restore_id=True):
self.clear()
hashmap = {}
if restore_id: self.id = data['id']
# create nodes
for node_data in data['nodes']:
self.getNodeClassFromData(node_data)(self).deserialize(
node_data, hashmap, restore_id)
# create edges
for edge_data in data['edges']:
Edge(self).deserialize(edge_data, hashmap, restore_id)
return True
class Scene(Serializable):
"""Class representing NodeEditor's `Scene`"""
def __init__(self):
"""
:Instance Attributes:
- **nodes** - list of `Nodes` in this `Scene`
- **edges** - list of `Edges` in this `Scene`
- **history** - Instance of :class:`~nodeeditor.node_scene_history.SceneHistory`
- **clipboard** - Instance of :class:`~nodeeditor.node_scene_clipboard.SceneClipboard`
- **scene_width** - width of this `Scene` in pixels
- **scene_height** - height of this `Scene` in pixels
"""
super().__init__()
self.nodes = []
self.edges = []
# current filename assigned to this scene
self.filename = None
self.scene_width = 64000
self.scene_height = 64000
# custom flag used to suppress triggering onItemSelected which does a bunch of stuff
self._silent_selection_events = False
self._has_been_modified = False
self._last_selected_items = None
# initialize all listeners
self._has_been_modified_listeners = []
self._item_selected_listeners = []
self._items_deselected_listeners = []
# here we can store callback for retrieving the class for Nodes
self.node_class_selector = None
self.initUI()
self.history = SceneHistory(self)
self.clipboard = SceneClipboard(self)
self.grScene.itemSelected.connect(self.onItemSelected)
self.grScene.itemsDeselected.connect(self.onItemsDeselected)
@property
def has_been_modified(self):
"""
Has this `Scene` been modified?
:getter: ``True`` if the `Scene` has been modified
:setter: set new state. Triggers `Has Been Modified` event
:type: ``bool``
"""
return self._has_been_modified
@has_been_modified.setter
def has_been_modified(self, value):
if not self._has_been_modified and value:
# set it now, because we will be reading it soon
self._has_been_modified = value
# call all registered listeners
for callback in self._has_been_modified_listeners:
callback()
self._has_been_modified = value
def initUI(self):
"""Set up Graphics Scene Instance"""
self.grScene = QDMGraphicsScene(self)
self.grScene.setGrScene(self.scene_width, self.scene_height)
def getNodeByID(self, node_id: int):
"""
Find node in the scene according to provided `node_id`
:param node_id: ID of the node we are looking for
:type node_id: ``int``
:return: Found ``Node`` or ``None``
"""
for node in self.nodes:
if node.id == node_id:
return node
return None
def setSilentSelectionEvents(self, value: bool = True):
"""Calling this can suppress onItemSelected events to be triggered. This is useful when working with clipboard"""
self._silent_selection_events = value
def onItemSelected(self, silent: bool = False):
"""
Handle Item selection and trigger event `Item Selected`
:param silent: If ``True`` scene's onItemSelected won't be called and history stamp not stored
:type silent: ``bool``
"""
if self._silent_selection_events: return
current_selected_items = self.getSelectedItems()
if current_selected_items != self._last_selected_items:
self._last_selected_items = current_selected_items
if not silent:
# we could create some kind of UI which could be serialized,
# therefore first run all callbacks...
for callback in self._item_selected_listeners:
callback()
# and store history as a last step always
self.history.storeHistory("Selection Changed")
def onItemsDeselected(self, silent: bool = False):
"""
Handle Items deselection and trigger event `Items Deselected`
:param silent: If ``True`` scene's onItemsDeselected won't be called and history stamp not stored
:type silent: ``bool``
"""
# somehow this event is being triggered when we start dragging file outside of our application
# or we just loose focus on our app? -- which does not mean we've deselected item in the scene!
# double check if the selection has actually changed, since
current_selected_items = self.getSelectedItems()
if current_selected_items == self._last_selected_items:
# print("Qt itemsDeselected Invalid Event! Ignoring")
return
self.resetLastSelectedStates()
if current_selected_items == []:
self._last_selected_items = []
if not silent:
self.history.storeHistory("Deselected Everything")
for callback in self._items_deselected_listeners:
callback()
def isModified(self) -> bool:
"""Is this `Scene` dirty aka `has been modified` ?
:return: ``True`` if `Scene` has been modified
:rtype: ``bool``
"""
return self.has_been_modified
def getSelectedItems(self) -> list:
"""
Returns currently selected Graphics Items
:return: list of ``QGraphicsItems``
:rtype: list[QGraphicsItem]
"""
return self.grScene.selectedItems()
def doDeselectItems(self, silent: bool = False) -> None:
"""
Deselects everything in scene
:param silent: If ``True`` scene's onItemsDeselected won't be called
:type silent: ``bool``
"""
for item in self.getSelectedItems():
item.setSelected(False)
if not silent:
self.onItemsDeselected()
# our helper listener functions
def addHasBeenModifiedListener(self, callback: 'function'):
"""
Register callback for `Has Been Modified` event
:param callback: callback function
"""
self._has_been_modified_listeners.append(callback)
def addItemSelectedListener(self, callback: 'function'):
"""
Register callback for `Item Selected` event
:param callback: callback function
"""
self._item_selected_listeners.append(callback)
def addItemsDeselectedListener(self, callback: 'function'):
"""
Register callback for `Items Deselected` event
:param callback: callback function
"""
self._items_deselected_listeners.append(callback)
def addDragEnterListener(self, callback: 'function'):
"""
Register callback for `Drag Enter` event
:param callback: callback function
"""
self.getView().addDragEnterListener(callback)
def addDropListener(self, callback: 'function'):
"""
Register callback for `Drop` event
:param callback: callback function
"""
self.getView().addDropListener(callback)
# custom flag to detect node or edge has been selected....
def resetLastSelectedStates(self):
"""Resets internal `selected flags` in all `Nodes` and `Edges` in the `Scene`"""
for node in self.nodes:
node.grNode._last_selected_state = False
for edge in self.edges:
edge.grEdge._last_selected_state = False
def getView(self) -> 'QGraphicsView':
"""Shortcut for returning `Scene` ``QGraphicsView``
:return: ``QGraphicsView`` attached to the `Scene`
:rtype: ``QGraphicsView``
"""
return self.grScene.views()[0]
def getItemAt(self, pos: 'QPointF'):
"""Shortcut for retrieving item at provided `Scene` position
:param pos: scene position
:type pos: ``QPointF``
:return: Qt Graphics Item at scene position
:rtype: ``QGraphicsItem``
"""
return self.getView().itemAt(pos)
def addNode(self, node: Node):
"""Add :class:`~nodeeditor.node_node.Node` to this `Scene`
:param node: :class:`~nodeeditor.node_node.Node` to be added to this `Scene`
:type node: :class:`~nodeeditor.node_node.Node`
"""
self.nodes.append(node)
def addEdge(self, edge: Edge):
"""Add :class:`~nodeeditor.node_edge.Edge` to this `Scene`
:param edge: :class:`~nodeeditor.node_edge.Edge` to be added to this `Scene`
:return: :class:`~nodeeditor.node_edge.Edge`
"""
self.edges.append(edge)
def removeNode(self, node: Node):
"""Remove :class:`~nodeeditor.node_node.Node` from this `Scene`
:param node: :class:`~nodeeditor.node_node.Node` to be removed from this `Scene`
:type node: :class:`~nodeeditor.node_node.Node`
"""
if node in self.nodes: self.nodes.remove(node)
else:
if DEBUG_REMOVE_WARNINGS:
print("!W:", "Scene::removeNode", "wanna remove nodeeditor",
node, "from self.nodes but it's not in the list!")
def removeEdge(self, edge: Edge):
"""Remove :class:`~nodeeditor.node_edge.Edge` from this `Scene`
:param edge: :class:`~nodeeditor.node_edge.Edge` to be remove from this `Scene`
:return: :class:`~nodeeditor.node_edge.Edge`
"""
if edge in self.edges: self.edges.remove(edge)
else:
if DEBUG_REMOVE_WARNINGS:
print("!W:", "Scene::removeEdge", "wanna remove edge", edge,
"from self.edges but it's not in the list!")
def clear(self):
"""Remove all `Nodes` from this `Scene`. This causes also to remove all `Edges`"""
while len(self.nodes) > 0:
self.nodes[0].remove()
self.has_been_modified = False
def saveToFile(self, filename: str):
"""
Save this `Scene` to the file on disk.
:param filename: where to save this scene
:type filename: ``str``
"""
with open(filename, "w") as file:
file.write(json.dumps(self.serialize(), indent=4))
print("saving to", filename, "was successfull.")
self.has_been_modified = False
self.filename = filename
def loadFromFile(self, filename: str):
"""
Load `Scene` from a file on disk
:param filename: from what file to load the `Scene`
:type filename: ``str``
:raises: :class:`~nodeeditor.node_scene.InvalidFile` if there was an error decoding JSON file
"""
with open(filename, "r") as file:
raw_data = file.read()
try:
data = json.loads(raw_data, encoding='utf-8')
self.filename = filename
self.deserialize(data)
self.has_been_modified = False
except json.JSONDecodeError:
raise InvalidFile("%s is not a valid JSON file" %
os.path.basename(filename))
except Exception as e:
dumpException(e)
def getEdgeClass(self):
"""Return the class representing Edge. Override me if needed"""
return Edge
def setNodeClassSelector(
self, class_selecting_function: 'functon') -> 'Node class type':
"""
Set the function which decides what `Node` class to instantiate when deserializing `Scene`.
If not set, we will always instantiate :class:`~nodeeditor.node_node.Node` for each `Node` in the `Scene`
:param class_selecting_function: function which returns `Node` class type (not instance) from `Node` serialized ``dict`` data
:type class_selecting_function: ``function``
:return: Class Type of `Node` to be instantiated during deserialization
:rtype: `Node` class type
"""
self.node_class_selector = class_selecting_function
def getNodeClassFromData(self, data: dict) -> 'Node class instance':
"""
Takes `Node` serialized data and determines which `Node Class` to instantiate according the description
in the serialized Node
:param data: serialized `Node` object data
:type data: ``dict``
:return: Instance of `Node` class to be used in this Scene
:rtype: `Node` class instance
"""
return Node if self.node_class_selector is None else self.node_class_selector(
data)
def serialize(self) -> OrderedDict:
nodes, edges = [], []
for node in self.nodes:
nodes.append(node.serialize())
for edge in self.edges:
edges.append(edge.serialize())
return OrderedDict([
('id', self.id),
('scene_width', self.scene_width),
('scene_height', self.scene_height),
('nodes', nodes),
('edges', edges),
])
def deserialize(self,
data: dict,
hashmap: dict = {},
restore_id: bool = True,
*args,
**kwargs) -> bool:
hashmap = {}
if restore_id: self.id = data['id']
# -- deserialize NODES
## Instead of recreating all the nodes, reuse existing ones...
# get list of all current nodes:
all_nodes = self.nodes.copy()
# go through deserialized nodes:
for node_data in data['nodes']:
# can we find this node in the scene?
found = False
for node in all_nodes:
if node.id == node_data['id']:
found = node
break
if not found:
try:
new_node = self.getNodeClassFromData(node_data)(self)
new_node.deserialize(node_data, hashmap, restore_id, *args,
**kwargs)
new_node.onDeserialized(node_data)
# print("New node for", node_data['title'])
except:
dumpException()
else:
try:
found.deserialize(node_data, hashmap, restore_id, *args,
**kwargs)
found.onDeserialized(node_data)
all_nodes.remove(found)
# print("Reused", node_data['title'])
except:
dumpException()
# remove nodes which are left in the scene and were NOT in the serialized data!
# that means they were not in the graph before...
while all_nodes != []:
node = all_nodes.pop()
node.remove()
# -- deserialize EDGES
## Instead of recreating all the edges, reuse existing ones...
# get list of all current edges:
all_edges = self.edges.copy()
# go through deserialized edges:
for edge_data in data['edges']:
# can we find this node in the scene?
found = False
for edge in all_edges:
if edge.id == edge_data['id']:
found = edge
break
if not found:
new_edge = Edge(self).deserialize(edge_data, hashmap,
restore_id, *args, **kwargs)
# print("New edge for", edge_data)
else:
found.deserialize(edge_data, hashmap, restore_id, *args,
**kwargs)
all_edges.remove(found)
# remove nodes which are left in the scene and were NOT in the serialized data!
# that means they were not in the graph before...
while all_edges != []:
edge = all_edges.pop()
edge.remove()
return True
class Scene(Serializable):
def __init__(self):
super().__init__()
self.nodes = []
self.edges = []
self.scene_width = 64000
self.scene_height = 64000
self._has_been_modified = False
self._has_been_modified_listeners = []
self.initUI()
self.history = SceneHistory(self)
self.clipboard = SceneClipboard(self)
@property
def has_been_modified(self):
return self._has_been_modified
@has_been_modified.setter
def has_been_modified(self, value):
if not self._has_been_modified and value:
self._has_been_modified = value
# call all registered listeners
for callback in self._has_been_modified_listeners:
callback()
self._has_been_modified = value
def addHasBeenModifiedListener(self, callback):
self._has_been_modified_listeners.append(callback)
def initUI(self):
self.grScene = QDMGraphicsScene(self)
self.grScene.setGrScene(self.scene_width, self.scene_height)
def addNode(self, node):
self.nodes.append(node)
def addEdge(self, edge):
self.edges.append(edge)
def removeNode(self, node):
if node in self.nodes: self.nodes.remove(node)
else:
print("!W:", "Scene::removeNode", "wanna remove node", node,
"from self.nodes but it's not in the list!")
def removeEdge(self, edge):
if edge in self.edges: self.edges.remove(edge)
else:
print("!W:", "Scene::removeEdge", "wanna remove edge", edge,
"from self.edges but it's not in the list!")
def clear(self):
while len(self.nodes) > 0:
self.nodes[0].remove()
self.has_been_modified = False
def saveToFile(self, filename):
with open(filename, "w") as file:
file.write(json.dumps(self.serialize(), indent=4))
print("saving to", filename, "was successfull.")
self.has_been_modified = False
def loadFromFile(self, filename):
with open(filename, "r") as file:
raw_data = file.read()
try:
data = json.loads(raw_data, encoding='utf-8')
self.deserialize(data)
self.has_been_modified = False
except json.JSONDecodeError:
raise InvalidFile("%s is not a valid JSON file" %
os.path.basename(filename))
except Exception as e:
dumpException(e)
def serialize(self):
nodes, edges = [], []
for node in self.nodes:
nodes.append(node.serialize())
for edge in self.edges:
edges.append(edge.serialize())
return OrderedDict([
('id', self.id),
('scene_width', self.scene_width),
('scene_height', self.scene_height),
('nodes', nodes),
('edges', edges),
])
def deserialize(self, data, hashmap={}, restore_id=True):
self.clear()
hashmap = {}
if restore_id: self.id = data['id']
# create nodes
for node_data in data['nodes']:
Node(self).deserialize(node_data, hashmap, restore_id)
# create edges
for edge_data in data['edges']:
Edge(self).deserialize(edge_data, hashmap, restore_id)
return True