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

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include <QtGui>

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

        PluginDialog::PluginDialog(const QString &path, const QStringList &fileNames,
                                   QWidget *parent)
            : QDialog(parent)
        {
            label = new QLabel;
            label->setWordWrap(true);

            QStringList headerLabels;
            headerLabels << tr("Components");

            treeWidget = new QTreeWidget;
            treeWidget->setAlternatingRowColors(false);
            treeWidget->setSelectionMode(QAbstractItemView::NoSelection);
            treeWidget->setHeaderLabels(headerLabels);
            treeWidget->header()->hide();

            okButton = new QPushButton(tr("OK"));
            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"));
            populateTreeWidget(path, fileNames);
        }

        void PluginDialog::populateTreeWidget(const QString &path,
                                              const QStringList &fileNames)
        {
            if (fileNames.isEmpty()) {
                label->setText(tr("Plug & Paint couldn't find any plugins in the %1 "
                                  "directory.")
                               .arg(QDir::convertSeparators(path)));
                treeWidget->hide();
            } else {
                label->setText(tr("Plug & Paint found the following plugins in the %1 "
                                  "directory:")
                               .arg(QDir::convertSeparators(path)));

                QDir dir(path);

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

                    QTreeWidgetItem *pluginItem = new QTreeWidgetItem(treeWidget);
                    pluginItem->setText(0, fileName);
                    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);
            }
        }