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plugindialog.cpp Example File
tools/plugandpaint/plugindialog.cpp

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 #include "interfaces.h"
 #include "plugindialog.h"

 #include <QPluginLoader>
 #include <QStringList>
 #include <QDir>

 #include <QLabel>
 #include <QGridLayout>
 #include <QPushButton>
 #include <QTreeWidget>
 #include <QTreeWidgetItem>
 #include <QHeaderView>

 PluginDialog::PluginDialog(const QString &path, const QStringList &fileNames,
                            QWidget *parent) :
     QDialog(parent),
     label(new QLabel),
     treeWidget(new QTreeWidget),
     okButton(new QPushButton(tr("OK")))
 {
     treeWidget->setAlternatingRowColors(false);
     treeWidget->setSelectionMode(QAbstractItemView::NoSelection);
     treeWidget->setColumnCount(1);
     treeWidget->header()->hide();

     okButton->setDefault(true);

     connect(okButton, SIGNAL(clicked()), this, SLOT(close()));

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->setColumnStretch(0, 1);
     mainLayout->setColumnStretch(2, 1);
     mainLayout->addWidget(label, 0, 0, 1, 3);
     mainLayout->addWidget(treeWidget, 1, 0, 1, 3);
     mainLayout->addWidget(okButton, 2, 1);
     setLayout(mainLayout);

     interfaceIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirOpenIcon),
                             QIcon::Normal, QIcon::On);
     interfaceIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirClosedIcon),
                             QIcon::Normal, QIcon::Off);
     featureIcon.addPixmap(style()->standardPixmap(QStyle::SP_FileIcon));

     setWindowTitle(tr("Plugin Information"));
     findPlugins(path, fileNames);
 }

 void PluginDialog::findPlugins(const QString &path,
                                const QStringList &fileNames)
 {
     label->setText(tr("Plug & Paint found the following plugins\n"
                       "(looked in %1):")
                    .arg(QDir::toNativeSeparators(path)));

     const QDir dir(path);

     foreach (QObject *plugin, QPluginLoader::staticInstances())
         populateTreeWidget(plugin, tr("%1 (Static Plugin)")
                                    .arg(plugin->metaObject()->className()));

     foreach (QString fileName, fileNames) {
         QPluginLoader loader(dir.absoluteFilePath(fileName));
         QObject *plugin = loader.instance();
         if (plugin)
             populateTreeWidget(plugin, fileName);
     }
 }

 void PluginDialog::populateTreeWidget(QObject *plugin, const QString &text)
 {
     QTreeWidgetItem *pluginItem = new QTreeWidgetItem(treeWidget);
     pluginItem->setText(0, text);
     treeWidget->setItemExpanded(pluginItem, true);

     QFont boldFont = pluginItem->font(0);
     boldFont.setBold(true);
     pluginItem->setFont(0, boldFont);

     if (plugin) {
         BrushInterface *iBrush = qobject_cast<BrushInterface *>(plugin);
         if (iBrush)
             addItems(pluginItem, "BrushInterface", iBrush->brushes());

         ShapeInterface *iShape = qobject_cast<ShapeInterface *>(plugin);
         if (iShape)
             addItems(pluginItem, "ShapeInterface", iShape->shapes());

         FilterInterface *iFilter =
                 qobject_cast<FilterInterface *>(plugin);
         if (iFilter)
             addItems(pluginItem, "FilterInterface", iFilter->filters());
     }
 }

 void PluginDialog::addItems(QTreeWidgetItem *pluginItem,
                             const char *interfaceName,
                             const QStringList &features)
 {
     QTreeWidgetItem *interfaceItem = new QTreeWidgetItem(pluginItem);
     interfaceItem->setText(0, interfaceName);
     interfaceItem->setIcon(0, interfaceIcon);

     foreach (QString feature, features) {
         if (feature.endsWith("..."))
             feature.chop(3);
         QTreeWidgetItem *featureItem = new QTreeWidgetItem(interfaceItem);
         featureItem->setText(0, feature);
         featureItem->setIcon(0, featureIcon);
     }
 }


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Qt 4.3.5