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Due to the weak couplings of the Qt signals and slot mechanisms, it is viable to bind signals to each other. It may sound confusing, so let me draw a diagram to make it clear: When an event triggers a specific signal, this emitted signal could be another event, which will emit another specific signal.

To use the property-based API, construct an instance of QMessageBox, set the desired properties, and call exec() to show the message. The simplest configuration is to set only the message text property. QMessageBox msgBox; msgBox. setText("The document has been modified."); msgBox.