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# 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.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     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);
         }
     }