From 5300c9dd1261a7f4ff8bf5a83608470e4953dd0f Mon Sep 17 00:00:00 2001 From: Gluzskiy Alexandr Date: Sat, 5 Nov 2011 03:24:07 +0200 Subject: this will be paid later --- .../html/qtsingleapplication-example-trivial.html | 103 +++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100755 libs/qtsingleapplication/doc/html/qtsingleapplication-example-trivial.html (limited to 'libs/qtsingleapplication/doc/html/qtsingleapplication-example-trivial.html') diff --git a/libs/qtsingleapplication/doc/html/qtsingleapplication-example-trivial.html b/libs/qtsingleapplication/doc/html/qtsingleapplication-example-trivial.html new file mode 100755 index 0000000..b3a1910 --- /dev/null +++ b/libs/qtsingleapplication/doc/html/qtsingleapplication-example-trivial.html @@ -0,0 +1,103 @@ + + + + + + A Trivial Example + + + + + + + +

A Trivial Example
+

The application in this example has a log-view that displays messages sent by further instances of the same application.

The example demonstrates the use of the QtSingleApplication class to detect and communicate with a running instance of the application using the sendMessage() API. The messageReceived() signal is used to display received messages in a QTextEdit log.

 /****************************************************************************
+ **
+ ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ ** All rights reserved.
+ **
+ ** Contact: Nokia Corporation (qt-info@nokia.com)
+ **
+ ** This file is part of a Qt Solutions component.
+ **
+ ** 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."
+ **
+ ****************************************************************************/
+
+ #include <qtsingleapplication.h>
+ #include <QtGui/QTextEdit>
+
+ class TextEdit : public QTextEdit
+ {
+     Q_OBJECT
+ public:
+     TextEdit(QWidget *parent = 0)
+         : QTextEdit(parent)
+     {}
+ public slots:
+     void append(const QString &str)
+     {
+         QTextEdit::append(str);
+     }
+ };
+
+ #include "main.moc"
+
+ int main(int argc, char **argv)
+ {
+     QtSingleApplication instance(argc, argv);

The example has only the main entry point function. A QtSingleApplication object is created immediately.

     if (instance.sendMessage("Wake up!"))
+         return 0;

If another instance of this application is already running, sendMessage() will succeed, and this instance just exits immediately.

     TextEdit logview;
+     logview.setReadOnly(true);
+     logview.show();

Otherwise the instance continues as normal and creates the user interface.

     instance.setActivationWindow(&logview);
+
+     QObject::connect(&instance, SIGNAL(messageReceived(const QString&)),
+                      &logview, SLOT(append(const QString&)));
+
+     return instance.exec();

The logview object is also set as the application's activation window. Every time a message is received, the window will be raised and activated automatically.

The messageReceived() signal is also connected to the QTextEdit's append() slot. Every message received from further instances of this application will be displayed in the log.

Finally the event loop is entered.

+ + + + +

Trademarks

Qt Solutions

+ -- cgit v1.2.3