Download KDE 2/QT programming bible by Arthur Griffith PDF

By Arthur Griffith

This all-in-one instructional and reference exhibits commencing to complex Linux programmers tips on how to construct graphical consumer interfaces for computing device purposes that would run within the Windows-like ok machine setting (KDE). specialist writer Arthur Griffith covers every little thing from easy home windows and menus to conversation bins and different complicated widgets. The CD-ROM comprises the most recent model of KDE

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Extra resources for KDE 2/QT programming bible

Example text

The call to resize() on line 31 is a request to make the entire widget shrink to 10 by 10 pixels. The widget is unable to comply with the request because of the minimum size of the rows and columns. Whenever a widget is instructed to resize itself and the new height or width is outside the bounds of its maximum or minimum, the requested value is ignored and the closest valid value is used — that is, either the maximum or the minimum. In this example, the widget is simply reduced to its minimum size.

The main window of an application is a single widget. This widget normally contains a collection of other widgets that display information and supply the user interface. ✦ An object can be written to broadcast one or more signals. An object can also contain one or more slots designed to receive broadcast signals. The implementation details of slots and signals are automated through the use of macros and the MOC compiler. This chapter described how to create and display the main window of an application.

The following example inserts five buttons — along with some space and stretch controls — into a vertical box. exec()); } A VerticalBox object is used as the display widget of the application window. qc 42 11/20/00 15:41 Page 42 Part I ✦ Getting Started 8 QSize buttonMaximum(400,400); 9 10 buttonOne = new QPushButton(this); 11 buttonOne->setText(“BUTTON ONE”); 12 buttonOne->setMinimumSize(buttonOne->sizeHint()); 13 buttonOne->setMaximumSize(buttonMaximum); 14 layout->addWidget(buttonOne); 15 16 buttonTwo = new QPushButton(this); 17 buttonTwo->setText(“BUTTON TWO”); 18 buttonTwo->setMinimumSize(buttonTwo->sizeHint()); 19 buttonTwo->setMaximumSize(buttonMaximum); 20 layout->addWidget(buttonTwo,30); 21 22 layout->addSpacing(20); 23 24 buttonThree = new QPushButton(this); 25 buttonThree->setText(“BUTTON THREE”); 26 buttonThree->setMinimumSize(buttonThree->sizeHint()); 27 buttonThree->setMaximumSize(buttonMaximum); 28 layout->addWidget(buttonThree); 29 30 layout->addStretch(30); 31 32 buttonFour = new QPushButton(this); 33 buttonFour->setText(“BUTTON FOUR”); 34 buttonFour->setMinimumSize(buttonFour->sizeHint()); 35 buttonFour->setMaximumSize(buttonMaximum); 36 layout->addWidget(buttonFour); 37 38 layout->addSpacing(5); 39 layout->addStretch(10); 40 41 buttonFive = new QPushButton(this); 42 buttonFive->setText(“BUTTON FIVE”); 43 buttonFive->setMinimumSize(buttonFive->sizeHint()); 44 buttonFive->setMaximumSize(buttonMaximum); 45 layout->addWidget(buttonFive); 46 47 resize(10,10); 48 layout->activate(); 49 } 50 VerticalBox::~VerticalBox() { } This class is a widget based on the QVBoxLayout object created on line 7.

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