Operations

Add a shape to the drawing. Undoing removes the shape.

Remove a shape from the drawing. Undoing adds the shape back.

Change the transform of a ShapeWithTransform. Undoing sets its transform back to its original value.

Edit the text of a TextShape. Undoing sets the text back to the original value.

If this operation immediately follows an AddShapeOperation for the exact same text shape, and originalText is empty, then this operation declines to be added to the undo stack and instead causes the AddShapeOperation to simply add the shape with the new text value. This means that we avoid having an “add empty text shape” operation in the undo stack.

Change the user-specified width of a text shape