The treebuilder module#

This module implements a TreeBuilder emitting Qt signals.

class TreeBuilder(document)[source]#

Bases: TreeBuilder, QObject

A TreeBuilder that uses Qt signals instead of callbacks.

The signals begin_*, end_*, change_* signals can be used to connect a QAbstractItemModel to a tree builder, they are not needed for normal operation.

started#: emitted when a new update job started

updated#: emitted when one full run finished

preview#: emitted with premature tree when peek_threshold is reached

begin_remove_rows#: emitted before removing a slice of nodes (Context, first, last)

end_remove_rows#: emitted after removing nodes

begin_insert_rows#: emitted before inserting nodes (Context, first, last)

end_insert_rows#: emitted after inserting nodes

change_position#: emitted when a slice of Tokens changes position (Context, first, last)

change_root_lexicon#: emitted when the root lexicon has changed

peek_threshold = 5000#: after how many characters a build preview is presented

peek(start, tree)[source]#: Reimplemented to get a sneak preview.

replace_nodes(context, slice_, nodes)[source]#: Reimplemented for fine-grained signals.

replace_pos(context, index, offset)[source]#: Reimplemented for fine-grained signals.

replace_root_lexicon(lexicon)[source]#: Reimplemented for fine-grained signals.

process_started()[source]#: Reimplemented to emit the started signal.

process_finished()[source]#: Reimplemented to emit the updated signal.