echowindow.cpp Example Filetools/echoplugin/echowindow/echowindow.cpp/**************************************************************************** ** ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/ ** ** 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 Nokia Corporation and its Subsidiary(-ies) nor ** the names of its contributors may be used to endorse or promote ** products derived from this software without specific prior written ** permission. ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include <QtWidgets> #include "echowindow.h" EchoWindow::EchoWindow() { createGUI(); setLayout(layout); setWindowTitle("Echo Plugin Example"); if (!loadPlugin()) { QMessageBox::information(this, "Error", "Could not load the plugin"); lineEdit->setEnabled(false); button->setEnabled(false); } } void EchoWindow::sendEcho() { QString text = echoInterface->echo(lineEdit->text()); label->setText(text); } void EchoWindow::createGUI() { lineEdit = new QLineEdit; label = new QLabel; label->setFrameStyle(QFrame::Box | QFrame::Plain); button = new QPushButton(tr("Send Message")); connect(lineEdit, SIGNAL(editingFinished()), this, SLOT(sendEcho())); connect(button, SIGNAL(clicked()), this, SLOT(sendEcho())); layout = new QGridLayout; layout->addWidget(new QLabel(tr("Message:")), 0, 0); layout->addWidget(lineEdit, 0, 1); layout->addWidget(new QLabel(tr("Answer:")), 1, 0); layout->addWidget(label, 1, 1); layout->addWidget(button, 2, 1, Qt::AlignRight); layout->setSizeConstraint(QLayout::SetFixedSize); } bool EchoWindow::loadPlugin() { QDir pluginsDir(qApp->applicationDirPath()); #if defined(Q_OS_WIN) if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release") pluginsDir.cdUp(); #elif defined(Q_OS_MAC) if (pluginsDir.dirName() == "MacOS") { pluginsDir.cdUp(); pluginsDir.cdUp(); pluginsDir.cdUp(); } #endif pluginsDir.cd("plugins"); foreach (QString fileName, pluginsDir.entryList(QDir::Files)) { QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName)); QObject *plugin = pluginLoader.instance(); if (plugin) { echoInterface = qobject_cast<EchoInterface *>(plugin); if (echoInterface) return true; } } return false; } |