diff options
Diffstat (limited to 'doc/src/snippets/code/src_corelib_kernel_qvariant.cpp')
-rw-r--r-- | doc/src/snippets/code/src_corelib_kernel_qvariant.cpp | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/doc/src/snippets/code/src_corelib_kernel_qvariant.cpp b/doc/src/snippets/code/src_corelib_kernel_qvariant.cpp deleted file mode 100644 index ae38c8372f..0000000000 --- a/doc/src/snippets/code/src_corelib_kernel_qvariant.cpp +++ /dev/null @@ -1,136 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/ -** -** 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] -QDataStream out(...); -QVariant v(123); // The variant now contains an int -int x = v.toInt(); // x = 123 -out << v; // Writes a type tag and an int to out -v = QVariant("hello"); // The variant now contains a QByteArray -v = QVariant(tr("hello")); // The variant now contains a QString -int y = v.toInt(); // y = 0 since v cannot be converted to an int -QString s = v.toString(); // s = tr("hello") (see QObject::tr()) -out << v; // Writes a type tag and a QString to out -... -QDataStream in(...); // (opening the previously written stream) -in >> v; // Reads an Int variant -int z = v.toInt(); // z = 123 -qDebug("Type is %s", // prints "Type is int" - v.typeName()); -v = v.toInt() + 100; // The variant now hold the value 223 -v = QVariant(QStringList()); -//! [0] - - -//! [1] -QVariant x, y(QString()), z(QString("")); -x.convert(QVariant::Int); -// x.isNull() == true -// y.isNull() == true, z.isNull() == false -//! [1] - - -//! [2] -QVariant variant; -... -QColor color = variant.value<QColor>(); -//! [2] - - -//! [3] -QColor color = palette().background().color(); -QVariant variant = color; -//! [3] - - -//! [4] -QVariant v; - -v.setValue(5); -int i = v.toInt(); // i is now 5 -QString s = v.toString() // s is now "5" - -MyCustomStruct c; -v.setValue(c); - -... - -MyCustomStruct c2 = v.value<MyCustomStruct>(); -//! [4] - - -//! [5] -QVariant v; - -MyCustomStruct c; -if (v.canConvert<MyCustomStruct>()) - c = v.value<MyCustomStruct>(); - -v = 7; -int i = v.value<int>(); // same as v.toInt() -QString s = v.value<QString>(); // same as v.toString(), s is now "7" -MyCustomStruct c2 = v.value<MyCustomStruct>(); // conversion failed, c2 is empty -//! [5] - - -//! [6] -QVariant v = 42; - -v.canConvert<int>(); // returns true -v.canConvert<QString>(); // returns true - -MyCustomStruct s; -v.setValue(s); - -v.canConvert<int>(); // returns false -v.canConvert<MyCustomStruct>(); // returns true -//! [6] - - -//! [7] -MyCustomStruct s; -return QVariant::fromValue(s); -//! [7] - - -//! [8] -QObject *object = getObjectFromSomewhere(); -QVariant data = QVariant::fromValue(object); -//! [8] |