By Jasmin Blanchette, Mark Summerfield
The single legitimate, Best-Practice consultant to Qt 4.3 Programming
Using Trolltech's Qt you could construct industrial-strength C++ functions that run natively on home windows, Linux/Unix, Mac OS X, and embedded Linux with out resource code alterations. Now, Trolltech insiders have written a start-to-finish consultant to getting remarkable effects with the newest model of Qt: Qt 4.3.
Packed with lifelike examples and in-depth suggestion, this is often the booklet Trolltech makes use of to coach Qt to its personal new hires. commonly revised and improved, it finds latest most sensible Qt programming styles for every thing from enforcing model/view structure to utilizing Qt 4.3's better images help. you will find confirmed ideas for nearly each GUI improvement activity, in addition to refined recommendations for delivering database entry, integrating XML, utilizing subclassing, composition, and extra. no matter if you are new to Qt or upgrading from an older model, this publication can assist accomplish every little thing that Qt 4.3 makes possible.
- thoroughly up-to-date all through, with major new insurance of databases, XML, and Qtopia embedded programming
- Covers all Qt 4.2/4.3 alterations, together with home windows Vista help, local CSS help for widget styling, and SVG dossier generation
- includes separate second and 3D chapters, assurance of Qt 4.3's new pictures view periods, and an creation to QPainter's OpenGL back-end
- contains new chapters on look-and-feel customization and alertness scripting
- Illustrates Qt 4's model/view structure, plugin aid, structure administration, occasion processing, box sessions, and masses more
- offers complicated suggestions coated in no different book—from developing plugins to interfacing with local APIs
- encompasses a new appendix on Qt Jambi, the hot Java model of Qt
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Additional resources for C Gui Programming With Qt4
One of the beauties of using Qt Designer is that it allows programmers great freedom to modify their form designs without being forced to change their source code. When you develop a form purely by writing C++ code, changes to the design can be quite time-consuming. With Qt Designer, no time is lost since uic simply regenerates the source code for any forms that have changed. ui file (an XML-based file format), while custom functionality is implemented by subclassing the uic-generated class. Shape-Changing Dialogs We have seen how to create dialogs that always show the same widgets whenever they are used.
The parent parameter specifies the parent widget. The default is a null pointer, meaning that the dialog has no parent. 13 signals: 14 void findNext(const QString &str, Qt::CaseSensitivity cs); 15 void findPrevious(const QString &str, Qt::CaseSensitivity cs); The signals section declares two signals that the dialog emits when the user clicks the Find button. If the Search backward option is enabled, the dialog emits findPrevious(); otherwise, it emits findNext(). The signals keyword is actually a macro.
The Find dialog's parentâ€ child relationships Finally, we set the title to be shown in the dialog's title bar and we set the window to have a fixed height, since there aren't any widgets in the dialog that can meaningfully occupy any extra vertical space. The QWidget::sizeHint() function returns a widget's "ideal" size. This completes the review of FindDialog's constructor. Since we used new to create the dialog's widgets and layouts, it would seem that we need to write a destructor that calls delete on each widget and layout we created.