C++ GUI programming with Qt3 by Jasmin Blanchette; Mark Summerfield

By Jasmin Blanchette; Mark Summerfield

Many businesses are dealing with issues of home windows improvement utilizing conventional home windows instruments equivalent to visible Studio. after they write functions, even simply "single platform" purposes for home windows, they typically need to account for ameliorations among assorted home windows models, which provides difficulty to improvement and upkeep. Qt works irrespective of the home windows types. This publication offers all of the details had to turn into a certified Qt developer. The e-book additionally covers pass platform GUI programming--programmers should be engaged on home windows, Linux, or Mac and the e-book will paintings for them. this is often valuable for advertisement businesses that use Qt, and for firms which are comparing Qt. it's going to even be helpful to the mammoth variety of open resource builders who already use Qt considering that no different publication of similar caliber or comprehensiveness is obtainable. This booklet teaches Qt's idioms and the way to take advantage of Qt to most sensible virtue. The ebook is prepared into 4 elements. the 1st half introduces the C++ precious for the powerful use of Qt. the second one half covers easy Qt, beginning with a few very brief examples, and fast increase to an entire Graphical consumer Interface software. the second one half offers assurance of key Qt beneficial properties together with signs. The 3rd and fourth elements disguise extra complex and really expert fabric

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About Qt 46 3. Creating Main Windows aboutQtAct = new QAction(tr("About &Qt"), 0, this); aboutQtAct->setStatusTip(tr("Show the Qt library’s About box")); connect(aboutQtAct, SIGNAL(activated()), qApp, SLOT(aboutQt())); } For About Qt, we use the QApplication object’s aboutQt() slot, accessible through the qApp global variable. Now that we have created the actions, we can move on to building a menu system through which the actions can be invoked: void MainWindow::createMenus() { fileMenu = new QPopupMenu(this); newAct->addTo(fileMenu); openAct->addTo(fileMenu); saveAct->addTo(fileMenu); saveAsAct->addTo(fileMenu); fileMenu->insertSeparator(); exitAct->addTo(fileMenu); for (int i = 0; i < MaxRecentFiles; ++i) recentFileIds[i] = -1; In Qt, all menus are instances of QPopupMenu.

We call QFileDialog::getSaveFileName() to obtain a file name from the user. If the user clicks Cancel, we return false, which is propagated up to maybeSave(). Otherwise, the returned file name may be a new name or the name of an existing file. 10. 10. arg(QDir::convertSeparators(fileName)) The QString::arg() function replaces the lowest-numbered “%n” parameter with its argument and returns the resulting string. " assuming that the application isn’t translated into another language. The QDir::convertSeparators() call converts forward slashes, which Qt uses as a portable directory separator, into the platform-specific separator (‘/’ on Unix and Mac OS X, ‘ ’ on Windows).

Laying out the form’s children in a grid The resulting grid layout has two columns and four rows, giving a total of eight cells. The Primary Key group box, the leftmost vertical spacer item, the Secondary Key group box, and the Tertiary Key group box each occupy a single cell. The vertical layout that contains the OK, Cancel, and More buttons occupies two cells. That leaves two empty cells in the bottom-right of the dialog. If this isn’t what you have, undo the layout, reposition the widgets, and try again.

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