New PDF release: C++ GUI programming with Qt3

By Jasmin Blanchette; Mark Summerfield

ISBN-10: 0131240722

ISBN-13: 9780131240728

Many businesses are dealing with issues of home windows improvement utilizing conventional home windows instruments reminiscent of visible Studio. once they write functions, even simply "single platform" functions for home windows, they typically need to account for transformations among diversified home windows models, which provides trouble to improvement and upkeep. Qt works irrespective of the home windows models. This ebook presents all of the info had to develop into a qualified Qt developer. The publication additionally covers pass platform GUI programming--programmers may be engaged on home windows, Linux, or Mac and the e-book will paintings for them. this can be worthy for advertisement businesses that use Qt, and for corporations which are comparing Qt. it is going to even be helpful to the immense variety of open resource builders who already use Qt seeing that no different publication of similar caliber or comprehensiveness is accessible. This e-book teaches Qt's idioms and the way to exploit Qt to top virtue. The booklet is prepared into 4 components. the 1st half introduces the C++ worthy for the powerful use of Qt. the second one half covers easy Qt, beginning with a few very brief examples, and fast increase to a whole Graphical consumer Interface application. the second one half offers assurance of key Qt beneficial properties together with signs. The 3rd and fourth elements conceal extra complicated and really good fabric

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We will begin with the Find dialog. Since we want the user to be able to switch between the main Spreadsheet window and the Find dialog at will, the Find dialog must be modeless. A modeless window is one that runs independently of any other windows in the application. When modeless dialogs are created, they normally have their signals connected to slots that respond to the user’s interactions. findDialog) { findDialog = new FindDialog(this); connect(findDialog, SIGNAL(findNext(const QString &, bool)), spreadsheet, SLOT(findNext(const QString &, bool))); connect(findDialog, SIGNAL(findPrev(const QString &, bool)), spreadsheet, SLOT(findPrev(const QString &, bool))); } findDialog->show(); findDialog->raise(); findDialog->setActiveWindow(); } The Find dialog is a window that enables the user to search for text in the spreadsheet.

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. Change the form’s resizeMode property from “Auto” to “Fixed”, making the dialog non-resizable by the user. The layout then takes over the responsibility for resizing, and resizes the dialog automatically when child widgets are shown or hidden, ensuring that the dialog is always displayed at its optimal size. Shape-Changing Dialogs 31 Rename the form “SortDialog” and change its caption to “Sort”.

The private slot findClicked() is called when the user clicks the Find button. The dialog closes itself when the user clicks Close. The close() slot is inherited from QWidget, and its default behavior is to hide the widget. We will look at the code for the enableFindButton() and findClicked() slots later on. Since QObject is one of FindDialog’s ancestors, we can omit the QObject:: prefix in front of the connect() calls. 026 027 028 QHBoxLayout *topLeftLayout = new QHBoxLayout; topLeftLayout->addWidget(label); topLeftLayout->addWidget(lineEdit); 029 030 031 032 QVBoxLayout *leftLayout = new QVBoxLayout; leftLayout->addLayout(topLeftLayout); leftLayout->addWidget(caseCheckBox); leftLayout->addWidget(backwardCheckBox); 033 034 035 036 QVBoxLayout *rightLayout = new QVBoxLayout; rightLayout->addWidget(findButton); rightLayout->addWidget(closeButton); rightLayout->addStretch(1); 037 038 QHBoxLayout *mainLayout = new QHBoxLayout(this); mainLayout->setMargin(11); ★ Qt provides TRUE and FALSE for all platforms and uses them throughout as synonyms for the standard true and false.

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

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