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The book presents all of the GUI elements in Qt, along with advice about when and how to use them, so you can make full use of the toolkit.
One might say that any string that is a plausible intermediate state during entry of an Acceptable string is Intermediate.
Qt comes with excellent reference documentation, but beginners often find the included tutorial is not enough to really get started with Qt. You'll learn how to program in Qt as the book guides you through the steps of writing a simple paint application.
Exercises with fully worked out answers help you deepen your understanding of the topics.
Here are some examples: For an editable combobox that accepts URLs, any well-formed URL is Acceptable, " is Intermediate (it might be a cut and paste operation that accidentally took in a comma at the end), the empty string is Intermediate (the user might select and delete all of the text in preparation for entering a new URL), and " is Invalid.
fixup() is provided for validators that can repair some user errors. QLine Edit, for example, will call fixup() if the user presses Enter (or Return) and the content is not currently valid.
Programming with Qt helps you get the most out of this powerful, easy-to-use, cross-platform toolkit.