settingsviewer.cpp

Qt4的一些例子

#include <QtGui>

#include "settingsviewer.h"

SettingsViewer::SettingsViewer(QWidget *parent)
    : QDialog(parent)
{
    organization = "Trolltech";
    application = "Designer";

    treeWidget = new QTreeWidget;
    treeWidget->setColumnCount(2);
    treeWidget->setHeaderLabels(
            QStringList() << tr("Key") << tr("Value"));
    treeWidget->header()->setResizeMode(0, QHeaderView::Stretch);
    treeWidget->header()->setResizeMode(1, QHeaderView::Stretch);

    openButton = new QPushButton(tr("&Open..."));
    openButton->setDefault(true);

    closeButton = new QPushButton(tr("Close"));

    connect(openButton, SIGNAL(clicked()), this, SLOT(open()));
    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

    QHBoxLayout *bottomLayout = new QHBoxLayout;
    bottomLayout->addStretch();
    bottomLayout->addWidget(openButton);
    bottomLayout->addWidget(closeButton);

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(treeWidget);
    mainLayout->addLayout(bottomLayout);
    setLayout(mainLayout);

    setWindowTitle(tr("Settings Viewer"));
    readSettings();
}

void SettingsViewer::open()
{
    QDialog dialog(this);

    QLabel *orgLabel = new QLabel(tr("&Organization:"));
    QLineEdit *orgLineEdit = new QLineEdit(organization);
    orgLabel->setBuddy(orgLineEdit);

    QLabel *appLabel = new QLabel(tr("&Application:"));
    QLineEdit *appLineEdit = new QLineEdit(application);
    appLabel->setBuddy(appLineEdit);

    QPushButton *okButton = new QPushButton(tr("OK"));
    okButton->setDefault(true);
    QPushButton *cancelButton = new QPushButton(tr("Cancel"));

    connect(okButton, SIGNAL(clicked()), &dialog, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), &dialog, SLOT(reject()));

    QHBoxLayout *buttonLayout = new QHBoxLayout;
    buttonLayout->addStretch();
    buttonLayout->addWidget(okButton);
    buttonLayout->addWidget(cancelButton);

    QGridLayout *gridLayout = new QGridLayout;
    gridLayout->addWidget(orgLabel, 0, 0);
    gridLayout->addWidget(orgLineEdit, 0, 1);
    gridLayout->addWidget(appLabel, 1, 0);
    gridLayout->addWidget(appLineEdit, 1, 1);

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addLayout(gridLayout);
    mainLayout->addLayout(buttonLayout);
    dialog.setLayout(mainLayout);

    dialog.setWindowTitle(tr("Choose Settings"));

    if (dialog.exec()) {
        organization = orgLineEdit->text();
        application = appLineEdit->text();
        readSettings();
    }
}

void SettingsViewer::readSettings()
{
    QSettings settings(organization, application);

    treeWidget->clear();
    addChildSettings(settings, 0, "");

    treeWidget->sortByColumn(0);
    treeWidget->setFocus();
    setWindowTitle(tr("Settings Viewer - %1 by %2")
                   .arg(application).arg(organization));
}

void SettingsViewer::addChildSettings(QSettings &settings,
        QTreeWidgetItem *parent, const QString &group)
{
    QTreeWidgetItem *item;

    settings.beginGroup(group);

    foreach (QString key, settings.childKeys()) {
        if (parent) {
            item = new QTreeWidgetItem(parent);
        } else {
            item = new QTreeWidgetItem(treeWidget);
        }
        item->setText(0, key);
        item->setText(1, settings.value(key).toString());
    }
    foreach (QString group, settings.childGroups()) {
        if (parent) {
            item = new QTreeWidgetItem(parent);
        } else {
            item = new QTreeWidgetItem(treeWidget);
        }
        item->setText(0, group);
        addChildSettings(settings, item, group);
    }
    settings.endGroup();
}