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The Tab Dialog example shows how to construct a tab dialog using the QTabWidget class.
Dialogs provide an efficient way for the application to communicate with the user, but complex dialogs suffer from the problem that they often take up too much screen area. By using a number of tabs in a dialog, information can be split into different categories, while remaining accessible.
class TabDialog : public QDialog { Q_OBJECT public: TabDialog(const QString &fileName, QWidget *parent = 0); private: QTabWidget *tabWidget; QDialogButtonBox *buttonBox; };In the example, the widget will be used as a top-level window, but we define the constructor so that it can take a parent widget. This allows the dialog to be centered on top of an application's main window.
TabDialog::TabDialog(const QString &fileName, QWidget *parent) : QDialog(parent) { QFileInfo fileInfo(fileName); tabWidget = new QTabWidget; tabWidget->addTab(new GeneralTab(fileInfo), tr("General")); tabWidget->addTab(new PermissionsTab(fileInfo), tr("Permissions")); tabWidget->addTab(new ApplicationsTab(fileInfo), tr("Applications"));The tab widget is populated with three custom widgets that each contain information about the file. We construct each of these without a parent widget because the tab widget will reparent them as they are added to it.
We create two standard push buttons, and connect each of them to the appropriate slots in the dialog:
The following code example is written in c++.
buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel); connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept())); connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));We arrange the the tab widget above the buttons in the dialog:
QVBoxLayout *mainLayout = new QVBoxLayout; mainLayout->addWidget(tabWidget); mainLayout->addWidget(buttonBox); setLayout(mainLayout);Finally, we set the dialog's title:
setWindowTitle(tr("Tab Dialog")); }Each of the tabs are subclassed from QWidget, and only provide constructors.
class GeneralTab : public QWidget { Q_OBJECT public: GeneralTab(const QFileInfo &fileInfo, QWidget *parent = 0); };
GeneralTab::GeneralTab(const QFileInfo &fileInfo, QWidget *parent) : QWidget(parent) { QLabel *fileNameLabel = new QLabel(tr("File Name:")); QLineEdit *fileNameEdit = new QLineEdit(fileInfo.fileName()); QLabel *pathLabel = new QLabel(tr("Path:")); QLabel *pathValueLabel = new QLabel(fileInfo.absoluteFilePath()); pathValueLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken); QLabel *sizeLabel = new QLabel(tr("Size:")); qlonglong size = fileInfo.size()/1024; QLabel *sizeValueLabel = new QLabel(tr("%1 K").arg(size)); sizeValueLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken); QLabel *lastReadLabel = new QLabel(tr("Last Read:")); QLabel *lastReadValueLabel = new QLabel(fileInfo.lastRead().toString()); lastReadValueLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken); QLabel *lastModLabel = new QLabel(tr("Last Modified:")); QLabel *lastModValueLabel = new QLabel(fileInfo.lastModified().toString()); lastModValueLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken); QVBoxLayout *mainLayout = new QVBoxLayout; mainLayout->addWidget(fileNameLabel); mainLayout->addWidget(fileNameEdit); mainLayout->addWidget(pathLabel); mainLayout->addWidget(pathValueLabel); mainLayout->addWidget(sizeLabel); mainLayout->addWidget(sizeValueLabel); mainLayout->addWidget(lastReadLabel); mainLayout->addWidget(lastReadValueLabel); mainLayout->addWidget(lastModLabel); mainLayout->addWidget(lastModValueLabel); mainLayout->addStretch(1); setLayout(mainLayout); }
class PermissionsTab : public QWidget { Q_OBJECT public: PermissionsTab(const QFileInfo &fileInfo, QWidget *parent = 0); };
PermissionsTab::PermissionsTab(const QFileInfo &fileInfo, QWidget *parent) : QWidget(parent) { QGroupBox *permissionsGroup = new QGroupBox(tr("Permissions")); QCheckBox *readable = new QCheckBox(tr("Readable")); if (fileInfo.isReadable()) readable->setChecked(true); QCheckBox *writable = new QCheckBox(tr("Writable")); if ( fileInfo.isWritable() ) writable->setChecked(true); QCheckBox *executable = new QCheckBox(tr("Executable")); if ( fileInfo.isExecutable() ) executable->setChecked(true); QGroupBox *ownerGroup = new QGroupBox(tr("Ownership")); QLabel *ownerLabel = new QLabel(tr("Owner")); QLabel *ownerValueLabel = new QLabel(fileInfo.owner()); ownerValueLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken); QLabel *groupLabel = new QLabel(tr("Group")); QLabel *groupValueLabel = new QLabel(fileInfo.group()); groupValueLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken); QVBoxLayout *permissionsLayout = new QVBoxLayout; permissionsLayout->addWidget(readable); permissionsLayout->addWidget(writable); permissionsLayout->addWidget(executable); permissionsGroup->setLayout(permissionsLayout); QVBoxLayout *ownerLayout = new QVBoxLayout; ownerLayout->addWidget(ownerLabel); ownerLayout->addWidget(ownerValueLabel); ownerLayout->addWidget(groupLabel); ownerLayout->addWidget(groupValueLabel); ownerGroup->setLayout(ownerLayout); QVBoxLayout *mainLayout = new QVBoxLayout; mainLayout->addWidget(permissionsGroup); mainLayout->addWidget(ownerGroup); mainLayout->addStretch(1); setLayout(mainLayout); }
class ApplicationsTab : public QWidget { Q_OBJECT public: ApplicationsTab(const QFileInfo &fileInfo, QWidget *parent = 0); };
ApplicationsTab::ApplicationsTab(const QFileInfo &fileInfo, QWidget *parent) : QWidget(parent) { QLabel *topLabel = new QLabel(tr("Open with:")); QListWidget *applicationsListBox = new QListWidget; QStringList applications; for (int i = 1; i <= 30; ++i) applications.append(tr("Application %1").arg(i)); applicationsListBox->insertItems(0, applications); QCheckBox *alwaysCheckBox; if (fileInfo.suffix().isEmpty()) alwaysCheckBox = new QCheckBox(tr("Always use this application to " "open this type of file")); else alwaysCheckBox = new QCheckBox(tr("Always use this application to " "open files with the extension '%1'").arg(fileInfo.suffix())); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(topLabel); layout->addWidget(applicationsListBox); layout->addWidget(alwaysCheckBox); setLayout(layout); }
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