How to use Application.CellDragAndDrop in the xlwings API way

Application.CellDragAndDrop in xlwings enables or disables the ability to drag and drop cells within Excel. This property is particularly useful when automating Excel through xlwings, as it allows developers to control whether users can interactively move cell contents by dragging—a feature that might interfere with automated processes or require restriction in certain applications. By setting this property, you can ensure the Excel environment behaves predictably during script execution.

Syntax and Parameters in xlwings
In xlwings, you access this property via the Application object. The syntax is straightforward:

app = xw.apps.active # Get the active Excel application
app.api.CellDragAndDrop = value

Here, app.api provides direct access to Excel’s underlying COM object model. The CellDragAndDrop property accepts a Boolean value:

• True (default in Excel): Enables cell drag-and-drop functionality.
• False: Disables cell drag-and-drop, preventing users from moving cells by dragging.

This property is read/write, meaning you can both retrieve its current state and modify it. Note that changes apply to the entire Excel instance and persist until altered again or Excel is restarted. In xlwings, using .api is essential because CellDragAndDrop is a native Excel VBA property not directly wrapped by xlwings’ high-level API.

Code Examples
Below are practical xlwings examples demonstrating how to use CellDragAndDrop:

1. Disabling drag-and-drop to prevent user interference during automation:

import xlwings as xw

# Connect to the active Excel instance
app = xw.apps.active

# Disable cell drag-and-drop
app.api.CellDragAndDrop = False
print("Cell drag-and-drop disabled.")

# Perform automated tasks, e.g., data manipulation
wb = app.books.active
sheet = wb.sheets[0]
sheet.range("A1").value = "Data processing in progress..."

# Re-enable drag-and-drop after completion
app.api.CellDragAndDrop = True
print("Cell drag-and-drop re-enabled.")

2. Checking the current state and toggling the setting:

import xlwings as xw

app = xw.apps.active

# Get the current setting
current_setting = app.api.CellDragAndDrop
print(f"Current CellDragAndDrop setting: {current_setting}")

# Toggle the setting
app.api.CellDragAndDrop = not current_setting
print(f"Toggled to: {app.api.CellDragAndDrop}")

3. Using in a context manager to temporarily disable drag-and-drop:

import xlwings as xw
from contextlib import contextmanager

@contextmanager
def disable_cell_drag_and_drop(app):
"""Temporarily disable cell drag-and-drop."""
original_setting = app.api.CellDragAndDrop
app.api.CellDragAndDrop = False
try:
    yield
finally:
    app.api.CellDragAndDrop = original_setting

# Usage
app = xw.apps.active
with disable_cell_drag_and_drop(app):
# Perform operations without drag-and-drop interference
app.books.active.sheets[0].range("A1:A10").value = [[i] for i in range(10)]
print("Data written with drag-and-drop disabled.")