class QDMGraphicsView(QGraphicsView): """Class representing NodeEditor's `Graphics View`""" #: pyqtSignal emitted when cursor position on the `Scene` has changed scenePosChanged = pyqtSignal(int, int) def __init__(self, grScene: 'QDMGraphicsScene', parent: 'QWidget' = None): """ :param grScene: reference to the :class:`~nodeeditor.node_graphics_scene.QDMGraphicsScene` :type grScene: :class:`~nodeeditor.node_graphics_scene.QDMGraphicsScene` :param parent: parent widget :type parent: ``QWidget`` :Instance Attributes: - **grScene** - reference to the :class:`~nodeeditor.node_graphics_scene.QDMGraphicsScene` - **mode** - state of the `Graphics View` - **zoomInFactor**- ``float`` - zoom step scaling, default 1.25 - **zoomClamp** - ``bool`` - do we clamp zooming or is it infinite? - **zoom** - current zoom step - **zoomStep** - ``int`` - the relative zoom step when zooming in/out - **zoomRange** - ``[min, max]`` """ super().__init__(parent) self.grScene = grScene self.initUI() self.setScene(self.grScene) self.mode = MODE_NOOP self.editingFlag = False self.rubberBandDraggingRectangle = False # edge dragging self.dragging = EdgeDragging(self) # cutline self.cutline = QDMCutLine() self.grScene.addItem(self.cutline) self.last_scene_mouse_position = QPoint(0, 0) self.zoomInFactor = 1.25 self.zoomClamp = True self.zoom = 10 self.zoomStep = 1 self.zoomRange = [0, 10] # listeners self._drag_enter_listeners = [] self._drop_listeners = [] def initUI(self): """Set up this ``QGraphicsView``""" self.setRenderHints(QPainter.Antialiasing | QPainter.HighQualityAntialiasing | QPainter.TextAntialiasing | QPainter.SmoothPixmapTransform) self.setViewportUpdateMode(QGraphicsView.FullViewportUpdate) self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff) self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff) self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse) self.setDragMode(QGraphicsView.RubberBandDrag) # enable dropping self.setAcceptDrops(True) def resetMode(self): """Helper function to re-set the grView's State Machine state to the default""" self.mode = MODE_NOOP def dragEnterEvent(self, event: QDragEnterEvent): """Trigger our registered `Drag Enter` events""" for callback in self._drag_enter_listeners: callback(event) def dropEvent(self, event: QDropEvent): """Trigger our registered `Drop` events""" for callback in self._drop_listeners: callback(event) def addDragEnterListener(self, callback: 'function'): """ Register callback for `Drag Enter` event :param callback: callback function """ self._drag_enter_listeners.append(callback) def addDropListener(self, callback: 'function'): """ Register callback for `Drop` event :param callback: callback function """ self._drop_listeners.append(callback) def mousePressEvent(self, event: QMouseEvent): """Dispatch Qt's mousePress event to corresponding function below""" if event.button() == Qt.MiddleButton: self.middleMouseButtonPress(event) elif event.button() == Qt.LeftButton: self.leftMouseButtonPress(event) elif event.button() == Qt.RightButton: self.rightMouseButtonPress(event) else: super().mousePressEvent(event) def mouseReleaseEvent(self, event: QMouseEvent): """Dispatch Qt's mouseRelease event to corresponding function below""" if event.button() == Qt.MiddleButton: self.middleMouseButtonRelease(event) elif event.button() == Qt.LeftButton: self.leftMouseButtonRelease(event) elif event.button() == Qt.RightButton: self.rightMouseButtonRelease(event) else: super().mouseReleaseEvent(event) def middleMouseButtonPress(self, event: QMouseEvent): """When Middle mouse button was pressed""" item = self.getItemAtClick(event) # debug print out if DEBUG_MMB_SCENE_ITEMS: if isinstance(item, QDMGraphicsEdge): print( "MMB DEBUG:", item.edge, "\n\t", item.edge.grEdge if item.edge.grEdge is not None else None) return if isinstance(item, QDMGraphicsSocket): print("MMB DEBUG:", item.socket, "socket_type:", item.socket.socket_type, "has edges:", "no" if item.socket.edges == [] else "") if item.socket.edges: for edge in item.socket.edges: print("\t", edge) return if DEBUG_MMB_SCENE_ITEMS and (item is None): print("SCENE:") print(" Nodes:") for node in self.grScene.scene.nodes: print("\t", node) print(" Edges:") for edge in self.grScene.scene.edges: print("\t", edge, "\n\t\tgrEdge:", edge.grEdge if edge.grEdge is not None else None) if event.modifiers() & Qt.CTRL: print(" Graphic Items in GraphicScene:") for item in self.grScene.items(): print(' ', item) if DEBUG_MMB_LAST_SELECTIONS and event.modifiers() & Qt.SHIFT: print("scene _last_selected_items:", self.grScene.scene._last_selected_items) return # faking events for enable MMB dragging the scene releaseEvent = QMouseEvent(QEvent.MouseButtonRelease, event.localPos(), event.screenPos(), Qt.LeftButton, Qt.NoButton, event.modifiers()) super().mouseReleaseEvent(releaseEvent) self.setDragMode(QGraphicsView.ScrollHandDrag) fakeEvent = QMouseEvent(event.type(), event.localPos(), event.screenPos(), Qt.LeftButton, event.buttons() | Qt.LeftButton, event.modifiers()) super().mousePressEvent(fakeEvent) def middleMouseButtonRelease(self, event: QMouseEvent): """When Middle mouse button was released""" fakeEvent = QMouseEvent(event.type(), event.localPos(), event.screenPos(), Qt.LeftButton, event.buttons() & ~Qt.LeftButton, event.modifiers()) super().mouseReleaseEvent(fakeEvent) self.setDragMode(QGraphicsView.RubberBandDrag) def leftMouseButtonPress(self, event: QMouseEvent): """When Left mouse button was pressed""" # get item which we clicked on item = self.getItemAtClick(event) # we store the position of last LMB click self.last_lmb_click_scene_pos = self.mapToScene(event.pos()) # if DEBUG: print("LMB Click on", item, self.debug_modifiers(event)) # logic if hasattr(item, "node") or isinstance( item, QDMGraphicsEdge) or item is None: if event.modifiers() & Qt.ShiftModifier: event.ignore() fakeEvent = QMouseEvent(QEvent.MouseButtonPress, event.localPos(), event.screenPos(), Qt.LeftButton, event.buttons() | Qt.LeftButton, event.modifiers() | Qt.ControlModifier) super().mousePressEvent(fakeEvent) return if isinstance(item, QDMGraphicsSocket): if self.mode == MODE_NOOP: self.mode = MODE_EDGE_DRAG self.dragging.edgeDragStart(item) return if self.mode == MODE_EDGE_DRAG: res = self.dragging.edgeDragEnd(item) if res: return if item is None: if event.modifiers() & Qt.ControlModifier: self.mode = MODE_EDGE_CUT fakeEvent = QMouseEvent(QEvent.MouseButtonRelease, event.localPos(), event.screenPos(), Qt.LeftButton, Qt.NoButton, event.modifiers()) super().mouseReleaseEvent(fakeEvent) QApplication.setOverrideCursor(Qt.CrossCursor) return else: self.rubberBandDraggingRectangle = True super().mousePressEvent(event) def leftMouseButtonRelease(self, event: QMouseEvent): """When Left mouse button was released""" # get item which we release mouse button on item = self.getItemAtClick(event) try: # logic if hasattr(item, "node") or isinstance( item, QDMGraphicsEdge) or item is None: if event.modifiers() & Qt.ShiftModifier: event.ignore() fakeEvent = QMouseEvent( event.type(), event.localPos(), event.screenPos(), Qt.LeftButton, Qt.NoButton, event.modifiers() | Qt.ControlModifier) super().mouseReleaseEvent(fakeEvent) return if self.mode == MODE_EDGE_DRAG: if self.distanceBetweenClickAndReleaseIsOff(event): res = self.dragging.edgeDragEnd(item) if res: return if self.mode == MODE_EDGE_CUT: self.cutIntersectingEdges() self.cutline.line_points = [] self.cutline.update() QApplication.setOverrideCursor(Qt.ArrowCursor) self.mode = MODE_NOOP return if self.rubberBandDraggingRectangle: self.rubberBandDraggingRectangle = False current_selected_items = self.grScene.selectedItems() if current_selected_items != self.grScene.scene._last_selected_items: if current_selected_items == []: self.grScene.itemsDeselected.emit() else: self.grScene.itemSelected.emit() self.grScene.scene._last_selected_items = current_selected_items return # otherwise deselect everything if item is None: self.grScene.itemsDeselected.emit() except: dumpException() super().mouseReleaseEvent(event) def rightMouseButtonPress(self, event: QMouseEvent): """When Right mouse button was pressed""" super().mousePressEvent(event) def rightMouseButtonRelease(self, event: QMouseEvent): """When Right mouse button was release""" ## cannot be because with dragging RMB we spawn Create New Node Context Menu ## However, you could use this if you want to cancel with RMB # if self.mode == MODE_EDGE_DRAG: # self.dragging.edgeDragEnd(None) # return super().mouseReleaseEvent(event) def mouseMoveEvent(self, event: QMouseEvent): """Overriden Qt's ``mouseMoveEvent`` handling Scene/View logic""" scenepos = self.mapToScene(event.pos()) if self.mode == MODE_EDGE_DRAG: self.dragging.updateDestination(scenepos.x(), scenepos.y()) if self.mode == MODE_EDGE_CUT and self.cutline is not None: self.cutline.line_points.append(scenepos) self.cutline.update() self.last_scene_mouse_position = scenepos self.scenePosChanged.emit(int(scenepos.x()), int(scenepos.y())) super().mouseMoveEvent(event) def keyPressEvent(self, event: QKeyEvent): """ .. note:: This overriden Qt's method was used for handling key shortcuts, before we implemented propper ``QWindow`` with Actions and Menu. Still the commented code serves as an example how to handle key presses without Qt's framework for Actions and shortcuts. There can be also found an example how to solve the problem when Node does contain Text/LineEdit and we press `Delete` key (also serving to delete `Node`) :param event: Qt's Key event :type event: ``QKeyEvent`` :return: """ # Use this code below if you wanna have shortcuts in this widget. # You want to use this, when you don't have a window which handles these shortcuts for you # if event.key() == Qt.Key_Delete: # if not self.editingFlag: # self.deleteSelected() # else: # super().keyPressEvent(event) # elif event.key() == Qt.Key_S and event.modifiers() & Qt.ControlModifier: # self.grScene.scene.saveToFile("graph.json") # elif event.key() == Qt.Key_L and event.modifiers() & Qt.ControlModifier: # self.grScene.scene.loadFromFile("graph.json") # elif event.key() == Qt.Key_Z and event.modifiers() & Qt.ControlModifier and not event.modifiers() & Qt.ShiftModifier: # self.grScene.scene.history.undo() # elif event.key() == Qt.Key_Z and event.modifiers() & Qt.ControlModifier and event.modifiers() & Qt.ShiftModifier: # self.grScene.scene.history.redo() # elif event.key() == Qt.Key_H: # print("HISTORY: len(%d)" % len(self.grScene.scene.history.history_stack), # " -- current_step", self.grScene.scene.history.history_current_step) # ix = 0 # for item in self.grScene.scene.history.history_stack: # print("#", ix, "--", item['desc']) # ix += 1 # else: super().keyPressEvent(event) def cutIntersectingEdges(self): """Compare which `Edges` intersect with current `Cut line` and delete them safely""" for ix in range(len(self.cutline.line_points) - 1): p1 = self.cutline.line_points[ix] p2 = self.cutline.line_points[ix + 1] # @TODO: we could collect all touched nodes, and notify them once after all edges removed # we could cut 3 edges leading to a single nodeeditor this will notify it 3x # maybe we could use some Notifier class with methods collect() and dispatch() for edge in self.grScene.scene.edges: if edge.grEdge.intersectsWith(p1, p2): edge.remove() self.grScene.scene.history.storeHistory("Delete cutted edges", setModified=True) def deleteSelected(self): """Shortcut for safe deleting every object selected in the `Scene`.""" for item in self.grScene.selectedItems(): if isinstance(item, QDMGraphicsEdge): item.edge.remove() elif hasattr(item, 'node'): item.node.remove() self.grScene.scene.history.storeHistory("Delete selected", setModified=True) def debug_modifiers(self, event): """Helper function get string if we hold Ctrl, Shift or Alt modifier keys""" out = "MODS: " if event.modifiers() & Qt.ShiftModifier: out += "SHIFT " if event.modifiers() & Qt.ControlModifier: out += "CTRL " if event.modifiers() & Qt.AltModifier: out += "ALT " return out def getItemAtClick(self, event: QEvent) -> 'QGraphicsItem': """Return the object on which we've clicked/release mouse button :param event: Qt's mouse or key event :type event: ``QEvent`` :return: ``QGraphicsItem`` which the mouse event happened or ``None`` """ pos = event.pos() obj = self.itemAt(pos) return obj def distanceBetweenClickAndReleaseIsOff(self, event: QMouseEvent) -> bool: """ Measures if we are too far from the last Mouse button click scene position. This is used for detection if we release too far after we clicked on a `Socket` :param event: Qt's mouse event :type event: ``QMouseEvent`` :return: ``True`` if we released too far from where we clicked before """ new_lmb_release_scene_pos = self.mapToScene(event.pos()) dist_scene = new_lmb_release_scene_pos - self.last_lmb_click_scene_pos edge_drag_threshold_sq = EDGE_DRAG_START_THRESHOLD * EDGE_DRAG_START_THRESHOLD return (dist_scene.x() * dist_scene.x() + dist_scene.y() * dist_scene.y()) > edge_drag_threshold_sq def wheelEvent(self, event: QWheelEvent): """overriden Qt's ``wheelEvent``. This handles zooming""" # calculate our zoom Factor zoomOutFactor = 1 / self.zoomInFactor # calculate zoom if event.angleDelta().y() > 0: zoomFactor = self.zoomInFactor self.zoom += self.zoomStep else: zoomFactor = zoomOutFactor self.zoom -= self.zoomStep clamped = False if self.zoom < self.zoomRange[0]: self.zoom, clamped = self.zoomRange[0], True if self.zoom > self.zoomRange[1]: self.zoom, clamped = self.zoomRange[1], True # set scene scale if not clamped or self.zoomClamp is False: self.scale(zoomFactor, zoomFactor)
class QDMGraphicsView(QGraphicsView): scenePosChanged = pyqtSignal(int, int) def __init__(self, grScene, parent=None): super().__init__(parent) self.grScene = grScene self.initUI() self.setScene(self.grScene) self.mode = MODE_NOOP self.editingFlag = False self.rubberBandDraggingRectangle = False self.zoomInFactor = 1.25 # 放大系数 self.zoomClamp = True # 变焦 self.zoom = 10 self.zoomStep = 1 self.zoomRange = [0, 10] # cutline 切割线/剪切线 self.cutline = QDMCutLine() self.grScene.addItem(self.cutline) # listeners self._drag_enter_listeners = [] self._drop_listeners = [] def initUI(self): self.setRenderHints(QPainter.Antialiasing | QPainter.HighQualityAntialiasing | QPainter.TextAntialiasing | QPainter.SmoothPixmapTransform) self.setViewportUpdateMode(QGraphicsView.FullViewportUpdate) self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff) self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff) self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse) self.setDragMode(QGraphicsView.RubberBandDrag) # enable dropping self.setAcceptDrops(True) def dragEnterEvent(self, event): for callback in self._drag_enter_listeners: callback(event) def dropEvent(self, event): for callback in self._drop_listeners: callback(event) def addDragEnterListener(self, callback): self._drag_enter_listeners.append(callback) def addDropListener(self, callback): self._drop_listeners.append(callback) def mousePressEvent(self, event): if event.button() == Qt.MiddleButton: self.middleMouseButtonPress(event) elif event.button() == Qt.LeftButton: self.leftMouseButtonPress(event) elif event.button() == Qt.RightButton: self.rightMouseButtonPress(event) else: super().mousePressEvent(event) def mouseReleaseEvent(self, event): if event.button() == Qt.MiddleButton: self.middleMouseButtonRelease(event) elif event.button() == Qt.LeftButton: self.leftMouseButtonRelease(event) elif event.button() == Qt.RightButton: self.rightMouseButtonRelease(event) else: super().mouseReleaseEvent(event) def middleMouseButtonPress(self, event): releaseEvent = QMouseEvent(QEvent.MouseButtonRelease, event.localPos(), event.screenPos(), Qt.LeftButton, Qt.NoButton, event.modifiers()) super().mouseReleaseEvent(releaseEvent) self.setDragMode(QGraphicsView.ScrollHandDrag) fakeEvent = QMouseEvent(event.type(), event.localPos(), event.screenPos(), Qt.LeftButton, event.buttons() | Qt.LeftButton, event.modifiers()) super().mousePressEvent(fakeEvent) def middleMouseButtonRelease(self, event): fakeEvent = QMouseEvent(event.type(), event.localPos(), event.screenPos(), Qt.LeftButton, event.buttons() & ~Qt.LeftButton, event.modifiers()) super().mouseReleaseEvent(fakeEvent) self.setDragMode(QGraphicsView.RubberBandDrag) def leftMouseButtonPress(self, event): # get item which we clicked on item = self.getItemAtClick(event) # we store the position of last LMB click self.last_lmb_click_scene_pos = self.mapToScene(event.pos()) # if DEBUG: print("LMB Click on", item, self.debug_modifiers(event)) # logic if hasattr(item, "node") or isinstance( item, QDMGraphicsEdge) or item is None: if event.modifiers() & Qt.ShiftModifier: event.ignore() fakeEvent = QMouseEvent(QEvent.MouseButtonPress, event.localPos(), event.screenPos(), Qt.LeftButton, event.buttons() | Qt.LeftButton, event.modifiers() | Qt.ControlModifier) super().mousePressEvent(fakeEvent) return if type(item) is QDMGraphicsSocket: if self.mode == MODE_NOOP: self.mode = MODE_EDGE_DRAG self.edgeDragStart(item) return if self.mode == MODE_EDGE_DRAG: res = self.edgeDragEnd(item) if res: return if item is None: if event.modifiers() & Qt.ControlModifier: self.mode = MODE_EDGE_CUT fakeEvent = QMouseEvent(QEvent.MouseButtonRelease, event.localPos(), event.screenPos(), Qt.LeftButton, Qt.NoButton, event.modifiers()) super().mouseReleaseEvent(fakeEvent) QApplication.setOverrideCursor(Qt.CrossCursor) return else: self.rubberBandDraggingRectangle = True super().mousePressEvent(event) def leftMouseButtonRelease(self, event): # get item which we release mouse button on item = self.getItemAtClick(event) # logic if hasattr(item, "node") or isinstance( item, QDMGraphicsEdge) or item is None: if event.modifiers() & Qt.ShiftModifier: event.ignore() fakeEvent = QMouseEvent(event.type(), event.localPos(), event.screenPos(), Qt.LeftButton, Qt.NoButton, event.modifiers() | Qt.ControlModifier) super().mouseReleaseEvent(fakeEvent) return if self.mode == MODE_EDGE_DRAG: if self.distanceBetweenClickAndReleaseIsOff(event): res = self.edgeDragEnd(item) if res: return if self.mode == MODE_EDGE_CUT: self.cutIntersectingEdges() self.cutline.line_points = [] self.cutline.update() QApplication.setOverrideCursor(Qt.ArrowCursor) self.mode = MODE_NOOP return if self.rubberBandDraggingRectangle: self.rubberBandDraggingRectangle = False current_selected_items = self.grScene.selectedItems() if current_selected_items != self.grScene.scene._last_selected_items: if current_selected_items == []: self.grScene.itemsDeselected.emit() else: self.grScene.itemSelected.emit() self.grScene.scene._last_selected_items = current_selected_items return # otherwise deselect everything if item is None: self.grScene.itemsDeselected.emit() super().mouseReleaseEvent(event) def rightMouseButtonPress(self, event): super().mousePressEvent(event) item = self.getItemAtClick(event) if DEBUG: if isinstance(item, QDMGraphicsEdge): print('RMB DEBUG:', item.edge, ' connecting sockets:', item.edge.start_socket, '<-->', item.edge.end_socket) if type(item) is QDMGraphicsSocket: print('RMB DEBUG:', item.socket, 'has edges:', item.socket.edges) if item is None: print('SCENE:') print(' Nodes:') for node in self.grScene.scene.nodes: print(' ', node) print(' Edges:') for edge in self.grScene.scene.edges: print(' ', edge) def rightMouseButtonRelease(self, event): super().mouseReleaseEvent(event) def mouseMoveEvent(self, event): if self.mode == MODE_EDGE_DRAG: pos = self.mapToScene(event.pos()) self.drag_edge.grEdge.setDestination(pos.x(), pos.y()) self.drag_edge.grEdge.update() if self.mode == MODE_EDGE_CUT: pos = self.mapToScene(event.pos()) self.cutline.line_points.append(pos) self.cutline.update() self.last_scene_mouse_position = self.mapToScene(event.pos()) self.scenePosChanged.emit(int(self.last_scene_mouse_position.x()), int(self.last_scene_mouse_position.y())) super().mouseMoveEvent(event) def keyPressEvent(self, event): # Use this code below if you wanna have shortcuts in this widget. # You want to use this, when you don't have a window which handles these shortcuts for you # if event.key() == Qt.Key_Delete: # if not self.editingFlag: # self.deleteSelected() # else: # super().keyPressEvent(event) # elif event.key() == Qt.Key_S and event.modifiers() & Qt.ControlModifier: # self.grScene.scene.saveToFile("graph.json") # elif event.key() == Qt.Key_L and event.modifiers() & Qt.ControlModifier: # self.grScene.scene.loadFromFile("graph.json") # elif event.key() == Qt.Key_Z and event.modifiers() & Qt.ControlModifier and not event.modifiers() & Qt.ShiftModifier: # self.grScene.scene.history.undo() # elif event.key() == Qt.Key_Z and event.modifiers() & Qt.ControlModifier and event.modifiers() & Qt.ShiftModifier: # self.grScene.scene.history.redo() # elif event.key() == Qt.Key_H: # print("HISTORY: len(%d)" % len(self.grScene.scene.history.history_stack), # " -- current_step", self.grScene.scene.history.history_current_step) # ix = 0 # for item in self.grScene.scene.history.history_stack: # print("#", ix, "--", item['desc']) # ix += 1 # else: super().keyPressEvent(event) def cutIntersectingEdges(self): for ix in range(len(self.cutline.line_points) - 1): p1 = self.cutline.line_points[ix] p2 = self.cutline.line_points[ix + 1] for edge in self.grScene.scene.edges: if edge.grEdge.intersectsWith(p1, p2): edge.remove() self.grScene.scene.history.storeHistory("Delete cutted edges", setModified=True) def deleteSelected(self): for item in self.grScene.selectedItems(): if isinstance(item, QDMGraphicsEdge): item.edge.remove() elif hasattr(item, 'node'): item.node.remove() self.grScene.scene.history.storeHistory("Delete selected", setModified=True) def debug_modifiers(self, event): out = "MODS: " if event.modifiers() & Qt.ShiftModifier: out += "SHIFT " if event.modifiers() & Qt.ControlModifier: out += "CTRL " if event.modifiers() & Qt.AltModifier: out += "ALT " return out def getItemAtClick(self, event): """ return the object on which we've clicked/release mouse button """ pos = event.pos() obj = self.itemAt(pos) return obj def edgeDragStart(self, item): if DEBUG: print('View::edgeDragStart ~ Start dragging edge') if DEBUG: print('View::edgeDragStart ~ assign Start Socket to:', item.socket) self.drag_start_socket = item.socket self.drag_edge = Edge(self.grScene.scene, item.socket, None, EDGE_TYPE_BEZIER) if DEBUG: print('View::edgeDragStart ~ dragEdge:', self.drag_edge) def edgeDragEnd(self, item): """ return True if skip the rest of the code """ self.mode = MODE_NOOP if DEBUG: print('View::edgeDragEnd ~ End dragging edge') self.drag_edge.remove() self.drag_edge = None if type(item) is QDMGraphicsSocket: if item.socket != self.drag_start_socket: # if we released dragging on a socket (other then the beginning socket) # we wanna keep all the edges comming from target socket if not item.socket.is_multi_edges: item.socket.removeAllEdges() # we wanna keep all the edges comming from start socket if not self.drag_start_socket.is_multi_edges: self.drag_start_socket.removeAllEdges() new_edge = Edge(self.grScene.scene, self.drag_start_socket, item.socket, edge_type=EDGE_TYPE_BEZIER) if DEBUG: print("View::edgeDragEnd ~ created new edge:", new_edge, "connecting", new_edge.start_socket, "<-->", new_edge.end_socket) self.grScene.scene.history.storeHistory( "Created new edge by dragging", setModified=True) return True if DEBUG: print('View::edgeDragEnd ~ everything done.') return False def distanceBetweenClickAndReleaseIsOff(self, event): """ measures if we are too far from the last LMB click scene position """ new_lmb_release_scene_pos = self.mapToScene(event.pos()) dist_scene = new_lmb_release_scene_pos - self.last_lmb_click_scene_pos edge_drag_threshold_sq = EDGE_DRAG_START_THRESHOLD * EDGE_DRAG_START_THRESHOLD return (dist_scene.x() * dist_scene.x() + dist_scene.y() * dist_scene.y()) > edge_drag_threshold_sq def wheelEvent(self, event): # calculate our zoom Factor zoomOutFactor = 1 / self.zoomInFactor # calculate zoom if event.angleDelta().y() > 0: zoomFactor = self.zoomInFactor self.zoom += self.zoomStep else: zoomFactor = zoomOutFactor self.zoom -= self.zoomStep clamped = False if self.zoom < self.zoomRange[0]: self.zoom, clamped = self.zoomRange[0], True if self.zoom > self.zoomRange[1]: self.zoom, clamped = self.zoomRange[1], True # set scene scale if not clamped or self.zoomClamp is False: self.scale(zoomFactor, zoomFactor)