/**************************************************************************** ** ** 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 the documentation 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." ** $QT_END_LICENSE$ ** ****************************************************************************/ //! [0] QT -= gui //! [0] //! [1] QT += network opengl sql qt3support //! [1] //! [2] CONFIG += uic3 //! [2] //! [3] #include //! [3] //! [4] #include #include #include //! [4] //! [5] #include //! [5] //! [6] #include //! [6] //! [7] using namespace Qt; //! [7] //! [8] QLabel *label1 = new QLabel("Hello", this); QLabel *label2 = new QLabel(this, "Hello"); //! [8] //! [9] MyWidget::MyWidget(QWidget *parent, const char *name) : QWidget(parent, name) { ... } //! [9] //! [10] // DEPRECATED if (obj->inherits("QPushButton")) { QPushButton *pushButton = (QPushButton *)obj; ... } //! [10] //! [11] QPushButton *pushButton = qobject_cast(obj); if (pushButton) { ... } //! [11] //! [12] QLabel *label = new QLabel; QPointer safeLabel = label; safeLabel->setText("Hello world!"); delete label; // safeLabel is now 0, whereas label is a dangling pointer //! [12] //! [13] QT += qt3support //! [13] //! [14] DEFINES += QT3_SUPPORT //! [14] //! [15] DEFINES += QT3_SUPPORT_WARNINGS //! [15] //! [16] DEFINES += QT3_SUPPORT //! [16]