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plugindialog.cpp Example File
^{tools/plugandpaint/plugindialog.cpp}

    /****************************************************************************
    **
    ** Copyright (C) 2005-2005 Trolltech AS. 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
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    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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    ****************************************************************************/

    #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);
        }
    }