qt signal slot connection type
How Qt Signals and Slots Work
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Signals and slots - Wikipedia
Qt’s widgets have many predefined signals and slots. For example, QAbstractButton (base class of buttons in Qt) has a clicked() signal and QLineEdit (single line input field) has a slot named clear().
Qt Tutorial => Signals and Slots - riptutorial.com
This enum describes the types of connection that can be used between signals and slots. In particular, it determines whether a particular signal is delivered to a slot immediately or queued for delivery at a later time.