Module saePisan.service.command.DeleteRowsCommand

Classes

class DeleteRowsCommand (model, start_row, rows_data)

Expand source code

class DeleteRowsCommand(QUndoCommand):
    """
    A command to delete rows from a model, supporting undo and redo operations.
    Attributes:
        model (QAbstractItemModel): The model from which rows will be deleted.
        start_row (int): The starting row index for deletion.
        rows_data (pl.DataFrame): The data of the rows to be deleted.
        executed (bool): A flag to indicate if the command has been executed.
    Methods:
        undo(): Reverts the deletion of rows by inserting them back into the model.
        redo(): Executes the deletion of rows from the model.
    """
    """
    Initializes the DeleteRowsCommand with the model, starting row, and rows data.
    Args:
        model (QAbstractItemModel): The model from which rows will be deleted.
        start_row (int): The starting row index for deletion.
        rows_data (list or pl.DataFrame): The data of the rows to be deleted.
    """
    """
    Reverts the deletion of rows by inserting them back into the model.
    """
    """
    Executes the deletion of rows from the model.
    """
    
    def __init__(self, model, start_row, rows_data):
        super().__init__("Delete Rows")
        self.model = model
        self.start_row = start_row
        self.rows_data = pl.DataFrame(rows_data) if not isinstance(rows_data, pl.DataFrame) else rows_data
        self.executed = False

    def undo(self):
        self.model.beginInsertRows(QModelIndex(), self.start_row, self.start_row + len(self.rows_data) - 1)
        self.model._data = pl.concat([pl.DataFrame(self.model._data[:self.start_row]), self.rows_data, pl.DataFrame(self.model._data[self.start_row:])])
        self.model.loaded_rows = min(self.model.loaded_rows + len(self.rows_data), self.model._data.shape[0])
        self.model.endInsertRows()
        self.model.layoutChanged.emit()

    def redo(self):
        if not self.executed:  # Prevent re-execution when pushed
            self.executed = True
        else:
            self.model.beginRemoveRows(QModelIndex(), self.start_row, self.start_row + len(self.rows_data) - 1)
            self.model._data = pl.concat([self.model._data[:self.start_row], self.model._data[self.start_row + len(self.rows_data):]])
            self.model.loaded_rows = max(self.model.loaded_rows - len(self.rows_data), 0)
            self.model.endRemoveRows()
            self.model.layoutChanged.emit()

A command to delete rows from a model, supporting undo and redo operations.

Attributes

model : QAbstractItemModel

The model from which rows will be deleted.

start_row : int

The starting row index for deletion.

rows_data : pl.DataFrame

The data of the rows to be deleted.

executed : bool

A flag to indicate if the command has been executed.

Methods

undo(): Reverts the deletion of rows by inserting them back into the model. redo(): Executes the deletion of rows from the model.

Ancestors

• PyQt6.QtGui.QUndoCommand
• PyQt6.sip.wrapper
• PyQt6.sip.simplewrapper

Methods

def redo(self)

Expand source code

def redo(self):
    if not self.executed:  # Prevent re-execution when pushed
        self.executed = True
    else:
        self.model.beginRemoveRows(QModelIndex(), self.start_row, self.start_row + len(self.rows_data) - 1)
        self.model._data = pl.concat([self.model._data[:self.start_row], self.model._data[self.start_row + len(self.rows_data):]])
        self.model.loaded_rows = max(self.model.loaded_rows - len(self.rows_data), 0)
        self.model.endRemoveRows()
        self.model.layoutChanged.emit()

redo(self)

def undo(self)

Expand source code

def undo(self):
    self.model.beginInsertRows(QModelIndex(), self.start_row, self.start_row + len(self.rows_data) - 1)
    self.model._data = pl.concat([pl.DataFrame(self.model._data[:self.start_row]), self.rows_data, pl.DataFrame(self.model._data[self.start_row:])])
    self.model.loaded_rows = min(self.model.loaded_rows + len(self.rows_data), self.model._data.shape[0])
    self.model.endInsertRows()
    self.model.layoutChanged.emit()

undo(self)