Practical C++ Design by Adam B. Singer

Author:Adam B. Singer
Language: eng
Format: epub, mobi
Publisher: Apress, Berkeley, CA

2.The GUI should have clickable buttons for entering numbers and all supported commands.

3.The GUI should have a status display area for displaying error messages.

The above requirements still do not explain what the calculator should actually look like. For that, we need a picture. Figure 6-1 shows the working calculator as it appears on my Linux desktop (Kubuntu 16.10 using Qt 5.7.1). To show the finished GUI as a prototype for designing the GUI is most certainly “cheating.” Hopefully, this shortcut does not detract from the realism of the case study too much. Obviously, one would not have a finished product at this stage in the development. In a production setting, one might have mock-ups drawn either by hand or with a program such as Microsoft PowerPoint, Adobe Illustrator, Inkscape, etc. Alternatively, maybe the GUI is being modeled from a physical object, and the designer either has photographs or direct access to that object. For example, one might be designing a GUI to replace a physical control system, and the requirements specify that the interface must display identical dials and gauges (to reduce operator retraining costs).

Figure 6-1The GUI on Linux with no plugins

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