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from PyQt5.QtWidgets import QUndoCommand
class addCommand(QUndoCommand):
def __init__(self, addItem, scene, parent = None):
super(addCommand, self).__init__(parent)
self.scene = scene
self.diagramItem = addItem
self.itemPos = addItem.pos()
self.setText(f"Add {self.diagramItem} {self.itemPos}")
def undo(self):
self.scene.removeItem(self.diagramItem)
self.scene.update()
def redo(self):
self.scene.addItem(self.diagramItem)
self.diagramItem.setPos(self.itemPos)
self.scene.clearSelection()
self.scene.update()
class deleteCommand(QUndoCommand):
def __init__(self, item, scene, parent = None):
super(deleteCommand, self).__init__(parent)
self.scene = scene
item.setSelected(False)
self.diagramItem = item
self.setText(f"Delete {self.diagramItem} {self.diagramItem.pos()}")
def undo(self):
self.scene.addItem(self.diagramItem)
self.scene.update()
def redo(self):
self.scene.removeItem(self.diagramItem)
class moveCommand(QUndoCommand):
def __init__(self, item, lastPos, parent = None):
super(moveCommand, self).__init__(parent)
self.diagramItem = item
self.lastPos = lastPos
self.newPos = item.pos()
def undo(self):
self.diagramItem.setPos(self.lastPos)
self.diagramItem.scene().update()
self.setText(f"Move {self.diagramItem} {self.newPos}")
def redo(self):
self.diagramItem.setPos(self.newPos)
self.setText(f"Move {self.diagramItem} {self.newPos}")
def mergeWith(self, move):
item = move.diagramItem
if self.diagramItem != item:
return False
self.newPos = item.pos()
self.setText(f"Move {self.diagramItem} {self.newPos}")
return True
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