Admin: 1 версия: Импорт контента...

2010-05-25T10:24:24Z

1 версия: Импорт контента...

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==Adding QStringList to QListWidget==

<source lang="cpp">
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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 "listwidgetdialog.h"
#include <QListWidget>
#include <QPushButton>
#include <QGridLayout>
ListWidgetDialog::ListWidgetDialog() : QDialog(0)
{
QPushButton *left, *right;
QGridLayout *layout = new QGridLayout( this );
layout->addWidget( left = new QPushButton( "<<" ), 0, 1 );
layout->addWidget( right = new QPushButton( ">>" ), 1, 1 );
layout->addWidget( leftList = new QListWidget(), 0, 0, 3, 1 );
layout->addWidget( rightList = new QListWidget(), 0, 2, 3, 1 );

connect( left, SIGNAL(clicked()), this, SLOT(moveLeft()) );
connect( right, SIGNAL(clicked()), this, SLOT(moveRight()) );
QStringList items;
items << "Argentine" << "Brazilian" << "South African"
<< "USA West" << "Monaco" << "Belgian" << "Spanish"
<< "Swedish" << "French" << "British" << "German"
<< "Austrian" << "Dutch" << "Italian" << "USA East"
<< "Canadian";
leftList->addItems( items );
}

void ListWidgetDialog::moveLeft()
{
if( rightList->selectedItems().count() != 1 )
return;

QListWidgetItem *item = rightList->takeItem( rightList->currentRow() );
leftList->addItem( item );
}
void ListWidgetDialog::moveRight()
{
if( leftList->selectedItems().count() != 1 )
return;

QListWidgetItem *item = leftList->takeItem( leftList->currentRow() );
rightList->addItem( item );
}

Chapter03\listwidget\listwidgetdialog.h
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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.
*
*/
#ifndef LISTWIDGETDIALOG_H
#define LISTWIDGETDIALOG_H
#include <QDialog>
class QListWidget;
class ListWidgetDialog : public QDialog
{
Q_OBJECT

public:
ListWidgetDialog();

public slots:
void moveLeft();
void moveRight();

private:
QListWidget *leftList;
QListWidget *rightList;
};
#endif // LISTWIDGETDIALOG_H

Chapter03\listwidget\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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 <QApplication>
#include "listwidgetdialog.h"
int main( int argc, char **argv )
{
QApplication app( argc, argv );

ListWidgetDialog dlg;
dlg.show();

return app.exec();
}

</source>

==A simple model that uses a QStringList as its data source==

<source lang="cpp">
/****************************************************************************
**
** Copyright (C) 2009 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of an example program for Qt.
** EDITIONS: NOLIMITS
**
****************************************************************************/
#ifndef MODEL_H
#define MODEL_H
#include <QAbstractListModel>
#include <QObject>
#include <QStringList>
class StringListModel : public QAbstractListModel
{
Q_OBJECT
public:
StringListModel(const QStringList &strings, QObject *parent = 0)
: QAbstractListModel(parent), stringList(strings) {}
int rowCount(const QModelIndex &parent = QModelIndex()) const;
QVariant data(const QModelIndex &index, int role) const;
QVariant headerData(int section, Qt::Orientation orientation,
int role = Qt::DisplayRole) const;
Qt::ItemFlags flags(const QModelIndex &index) const;
bool setData(const QModelIndex &index, const QVariant &value,
int role = Qt::EditRole);
bool insertRows(int position, int rows, const QModelIndex &index = QModelIndex());
bool removeRows(int position, int rows, const QModelIndex &index = QModelIndex());
private:
QStringList stringList;
};
#endif

/*
model.cpp
A simple model that uses a QStringList as its data source.
*/
#include "model.h"
/*!
Returns the number of items in the string list as the number of rows
in the model.
*/
int StringListModel::rowCount(const QModelIndex &parent) const
{
return stringList.count();
}
/*!
Returns an appropriate value for the requested data.
If the view requests an invalid index, an invalid variant is returned.
Any valid index that corresponds to a string in the list causes that
string to be returned.
*/
QVariant StringListModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();
if (index.row() >= stringList.size())
return QVariant();
if (role == Qt::DisplayRole)
return stringList.at(index.row());
else
return QVariant();
}
/*!
Returns the appropriate header string depending on the orientation of
the header and the section. If anything other than the display role is
requested, we return an invalid variant.
*/
QVariant StringListModel::headerData(int section, Qt::Orientation orientation,
int role) const
{
if (role != Qt::DisplayRole)
return QVariant();
if (orientation == Qt::Horizontal)
return QString("Column %1").arg(section);
else
return QString("Row %1").arg(section);
}
/*!
Returns an appropriate value for the item"s flags. Valid items are
enabled, selectable, and editable.
*/
Qt::ItemFlags StringListModel::flags(const QModelIndex &index) const
{
if (!index.isValid())
return Qt::ItemIsEnabled;
return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
}
/*!
Changes an item in the string list, but only if the following conditions
are met:
* The index supplied is valid.
* The index corresponds to an item to be shown in a view.
* The role associated with editing text is specified.
The dataChanged() signal is emitted if the item is changed.
*/
bool StringListModel::setData(const QModelIndex &index,
const QVariant &value, int role)
{
if (index.isValid() && role == Qt::EditRole) {
stringList.replace(index.row(), value.toString());
emit dataChanged(index, index);
return true;
}
return false;
}
/*!
Inserts a number of rows into the model at the specified position.
*/
bool StringListModel::insertRows(int position, int rows, const QModelIndex &parent)
{
beginInsertRows(QModelIndex(), position, position+rows-1);
for (int row = 0; row < rows; ++row) {
stringList.insert(position, "");
}
endInsertRows();
return true;
}
/*!
Removes a number of rows from the model at the specified position.
*/
bool StringListModel::removeRows(int position, int rows, const QModelIndex &parent)
{
beginRemoveRows(QModelIndex(), position, position+rows-1);
for (int row = 0; row < rows; ++row) {
stringList.removeAt(position);
}
endRemoveRows();
return true;
}

#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
#include <QModelIndex>
class QAction;
class QListView;
class StringListModel;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
public slots:
void insertItem();
void removeItem();
void sortAscending();
void sortDescending();
void updateMenus(const QModelIndex &current);
private:
QAction *insertAction;
QAction *removeAction;
QListView *listView;
StringListModel *model;
};
#endif

#include <QtGui>
#include "mainwindow.h"
#include "model.h"
MainWindow::MainWindow()
{
QMenu *fileMenu = new QMenu(tr("&File"));
QAction *quitAction = fileMenu->addAction(tr("E&xit"));
quitAction->setShortcut(tr("Ctrl+Q"));
QMenu *itemsMenu = new QMenu(tr("&Items"));
insertAction = itemsMenu->addAction(tr("&Insert Item"));
removeAction = itemsMenu->addAction(tr("&Remove Item"));
QAction *ascendingAction = itemsMenu->addAction(tr("Sort in &Ascending Order"));
QAction *descendingAction = itemsMenu->addAction(tr("Sort in &Descending Order"));
menuBar()->addMenu(fileMenu);
menuBar()->addMenu(itemsMenu);
QStringList strings;
strings << tr("Oak") << tr("Fir") << tr("Pine") << tr("Birch")
<< tr("Hazel") << tr("Redwood") << tr("Sycamore") << tr("Chestnut");
model = new StringListModel(strings, this);
/* For convenient quoting:
QListView *listView = new QListView(this);
*/
listView = new QListView(this);
listView->setModel(model);
listView->setSelectionMode(QAbstractItemView::SingleSelection);
connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
connect(ascendingAction, SIGNAL(triggered()), this, SLOT(sortAscending()));
connect(descendingAction, SIGNAL(triggered()), this, SLOT(sortDescending()));
connect(insertAction, SIGNAL(triggered()), this, SLOT(insertItem()));
connect(removeAction, SIGNAL(triggered()), this, SLOT(removeItem()));
connect(listView->selectionModel(),
SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
this, SLOT(updateMenus(const QModelIndex &)));
updateMenus(listView->selectionModel()->currentIndex());
setCentralWidget(listView);
setWindowTitle(tr("List View"));
}
void MainWindow::sortAscending()
{
model->sort(0, Qt::AscendingOrder);
}
void MainWindow::sortDescending()
{
model->sort(0, Qt::DescendingOrder);
}
void MainWindow::insertItem()
{
QModelIndex currentIndex = listView->currentIndex();
if (!currentIndex.isValid())
return;
QString itemText = QInputDialog::getText(this, tr("Insert Item"),
tr("Input text for the new item:"));
if (itemText.isNull())
return;
if (model->insertRow(currentIndex.row(), QModelIndex())) {
QModelIndex newIndex = model->index(currentIndex.row(), 0, QModelIndex());
model->setData(newIndex, itemText, Qt::EditRole);
QString toolTipText = tr("Tooltip:") + itemText;
QString statusTipText = tr("Status tip:") + itemText;
QString whatsThisText = tr("What"s This?:") + itemText;
model->setData(newIndex, toolTipText, Qt::ToolTipRole);
model->setData(newIndex, toolTipText, Qt::StatusTipRole);
model->setData(newIndex, whatsThisText, Qt::WhatsThisRole);
}
}
void MainWindow::removeItem()
{
QModelIndex currentIndex = listView->currentIndex();
if (!currentIndex.isValid())
return;
model->removeRow(currentIndex.row(), QModelIndex());
}
void MainWindow::updateMenus(const QModelIndex &current)
{
insertAction->setEnabled(current.isValid());
removeAction->setEnabled(current.isValid());
}

#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow *window = new MainWindow;
window->show();
return app.exec();
}

</source>

==Complete demo for QStringList==

<source lang="cpp">
/****************************************************************************
**
** Copyright (C) 2009 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
#include <iostream>
using namespace std;
class Widget : public QWidget
{
public:
Widget(QWidget *parent = 0);
};
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QStringList fonts;
fonts << "Arial" << "Helvetica" << "Times" << "Courier";

for (int i = 0; i < fonts.size(); ++i)
cout << fonts.at(i).toLocal8Bit().constData() << endl;

QStringListIterator javaStyleIterator(fonts);
while (javaStyleIterator.hasNext())
cout << javaStyleIterator.next().toLocal8Bit().constData() << endl;

QStringList::const_iterator constIterator;
for (constIterator = fonts.constBegin(); constIterator != fonts.constEnd();
++constIterator)
cout << (*constIterator).toLocal8Bit().constData() << endl;

QString str = fonts.join(",");
// str == "Arial,Helvetica,Times,Courier"

QStringList list;
list = str.split(",");
// list: ["Arial", "Helvetica", "Times", "Courier"]

QStringList monospacedFonts = fonts.filter(QRegExp("Courier|Fixed"));

QStringList files;
files << "$QTDIR/src/moc/moc.y"
<< "$QTDIR/src/moc/moc.l"
<< "$QTDIR/include/qconfig.h";
files.replaceInStrings("$QTDIR", "/usr/lib/qt");
// files: [ "/usr/lib/qt/src/moc/moc.y", ...]

QString str1, str2, str3;
QStringList longerList = (QStringList() << str1 << str2 << str3);

list.clear();
list << "Bill Murray" << "John Doe" << "Bill Clinton";

QStringList result;
result = list.filter("Bill");
// result: ["Bill Murray", "Bill Clinton"]

result.clear();
foreach (QString str, list) {
if (str.contains("Bill"))
result += str;
}

list.clear();
list << "alpha" << "beta" << "gamma" << "epsilon";
list.replaceInStrings("a", "o");
// list == ["olpho", "beto", "gommo", "epsilon"]

list.clear();
list << "alpha" << "beta" << "gamma" << "epsilon";
list.replaceInStrings(QRegExp("^a"), "o");
// list == ["olpha", "beta", "gamma", "epsilon"]

list.clear();
list << "Bill Clinton" << "Murray, Bill";
list.replaceInStrings(QRegExp("^(.*), (.*)$"), "\\2 \\1");
// list == ["Bill Clinton", "Bill Murray"]
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Widget widget;
widget.show();
return app.exec();
}

</source>

==QStringList demo==

<source lang="cpp">
Chapter01\stringlist-stack-queue\special-lists.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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 <QStringList>
#include <QStack>
#include <QQueue>
#include <QtDebug>
void stringList()
{
QString text;

QStringList list;
list << "foo" << "bar" << "baz";
foreach( text, list )
qDebug() << text;

qDebug() << "---";
QString all = list.join(",");
qDebug() << all;
qDebug() << "---";
list.replaceInStrings( "a", "oo" );
foreach( text, list )
qDebug() << text;

qDebug() << "---";
list << all.split(",");
foreach( text, list )
qDebug() << text;
}
void stackDemo()
{
QStack<QString> stack;

stack.push( "foo" );
stack.push( "bar" );
stack.push( "baz" );

QString result;
while( !stack.isEmpty() )
result += stack.pop();
qDebug() << result;
}
void queueDemo()
{
QQueue<QString> queue;

queue.enqueue( "foo" );
queue.enqueue( "bar" );
queue.enqueue( "baz" );

QString result;
while( !queue.isEmpty() )
result += queue.dequeue();
qDebug() << result;
}
int main( void )
{
qDebug() << "String list";
stringList();

qDebug() << "Stack";
stackDemo();

qDebug() << "Queue";
queueDemo();

return 0;
}

</source>

==Quick sort QStringList==

<source lang="cpp">
#include <QList>
#include <QtAlgorithms> // for qSort()
#include <QStringList>
#include <QDebug>
class CaseIgnoreString : public QString {
public:
CaseIgnoreString(const QString& other = QString()) : QString(other) {}
bool operator<(const QString & other) const {
return toLower() < other.toLower();
}
bool operator==(const QString& other) const {
return toLower() == other.toLower();
}
};
int main() {
CaseIgnoreString s1("A"), s2("b"), s3 ("C"), s4("d"), s5 ("D");
QList<CaseIgnoreString> namelist;
namelist << s5 << s1 << s3 << s4 << s2;

qSort(namelist.begin(), namelist.end());
int i=0;
foreach (QString stritr, namelist) {
qDebug() << QString("namelist[%1] = %2").arg(i++).arg(stritr) ;
}
QStringList strlist;
strlist << s5 << s1 << s3 << s4 << s2;
qSort(strlist.begin(), strlist.end());
qDebug() << "StringList sorted: " + strlist.join(", ") << endl;
return 0;
}

</source>

==Search in a list of fruit names first for the word Pear and then for Orange==

<source lang="cpp">
#include <QStringList>
#include <QDebug>
int main()
{
QStringList list;
list << "apple" << "pear" << "banana";
QStringList::iterator i1 = qFind(list.begin(), list.end(), "pear");
QStringList::iterator i2 = qFind(list.begin(), list.end(), "orange");
return 0;
}

</source>

==Split QStringList==

<source lang="cpp">
#include <QStringList>
#include <QDebug>
int main() {
QString winter = "A, B, C";
QString spring = "D, E, F";
QString summer = "G, H, I";
QString fall = "X, Y, Z";
QStringList list;
list << winter;
list += spring;
list.append(summer);
list << fall;
QString allmonths = list.join(", ");
QStringList list2 = allmonths.split(", ");
Q_ASSERT(list2.size() == 12);
foreach (QString str, list) {
qDebug() << QString(" [%1] ").arg(str);
}

return 0;
}

</source>

==STL-Style Iterators==

<source lang="cpp">

#include <QtCore>
#include <QDebug>
using namespace std;
int main() {
QStringList list;
list << "dog" << "cat" << "mouse";
QStringList::iterator it;
for (it = list.begin(); it != list.end(); ++it)
{
qDebug() << *it << endl;
}
return 0;
}

</source>

==using QStringList, append to and output and join==

<source lang="cpp">
#include <QStringList>
#include <QDebug>
int main() {
QString winter = "A, B, C";
QString spring = "D, E, F";
QString summer = "G, H, I";
QString fall = "X, Y, Z";
QStringList list;
list << winter;
list += spring;
list.append(summer);
list << fall;
qDebug() << "The Spring months are: " << list[1] ;

QString allmonths = list.join(", ");
qDebug() << allmonths;
return 0;
}

</source>

C++/Qt/QStringList - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...

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