By Johan Thelin
Qt is among the so much influential graphical toolkits for the Linux working approach and is readily being followed on different structures (Windows, Mac OS) besides. it's important to benefit for all Linux programmers. This publication takes the reader step-by-step in the course of the complexities of Qt, laying the basis that enables the reader to make the step from amateur to specialist. This publication is filled with genuine international examples that may be fast built-in right into a developer’s undertaking. whereas the reader is thought to be a newbie at Qt improvement, they're required to have a operating wisdom of C++ programming.
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Extra resources for Foundations of Qt development
Using Designer Designer is the tool for designing user interfaces that comes with Qt. This section shows you how to use Designer to build the list dialog. Then you learn the specifications for the editing dialog so you can put it together yourself. Let’s begin by starting Designer. You see the dialog shown in Figure 2-2. For the list dialog, choose to create a dialog with the buttons at the bottom and click Create. 35 36 CHAPTER 2 ■ RAPID APPLICATION DEVELOPMENT USING QT ■Tip If you are running Windows, you can start Designer by selecting it from the Start menu or by starting the Qt command prompt and then typing designer at the console.
So a good starting point when developing an application is to identify the actions that the user can take through the UI shown in Figure 2-1. ■Tip The actions identified here are very much like use cases in the Unified Modeling Language (UML), which means that the two approaches are very compatible. CHAPTER 2 ■ RAPID APPLICATION DEVELOPMENT USING QT • The first action is to start the application. When this happens, the list dialog is shown. • From the list dialog, the user adds a new item. This shows an empty editing dialog.
Figure 2-18 shows the dialog after the changes. Table 2-1. Properties to change Widget Property Value Top button name addButton Top button text Add new Second button name editButton Second button text Edit Third button name deleteButton Third button text Delete Bottom button name clearButton Bottom button text Clear all List widget name list Dialog name ListDialog Dialog window title Phone Book Figure 2-18. Names and texts have been updated The name property is used to give each widget a variable name, which is the name you will use later on when you access the widget from the source code.