- Qt 5.5
- Qt Widgets
- Plug & Paint Example
- plugindialog.cpp Example File
- Qt 5.5.1 Reference Documentation

# plugindialog.cpp Example File

tools/plugandpaint/plugindialog.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
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    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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);
        }
    }