в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

Admin: 1 версия: Импорт контента...

2010-05-25T10:25:15Z

1 версия: Импорт контента...

Новая страница

==Iterate QTreeWidgetItem==

<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.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QAction;
class QTreeWidget;
class QTreeWidgetItem;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
public slots:
void findItems();
void insertItem();
void removeItem();
void sortAscending();
void sortDescending();
void updateMenus(QTreeWidgetItem *current);
void updateSortItems();
private:
void setupTreeItems();
QAction *ascendingAction;
QAction *autoSortAction;
QAction *descendingAction;
QAction *insertAction;
QAction *removeAction;
QTreeWidget *treeWidget;
};
#endif

#include <QtGui>
#include "mainwindow.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"));
removeAction->setEnabled(false);
itemsMenu->addSeparator();
ascendingAction = itemsMenu->addAction(tr("Sort in &Ascending Order"));
descendingAction = itemsMenu->addAction(tr("Sort in &Descending Order"));
autoSortAction = itemsMenu->addAction(tr("&Automatically Sort Items"));
autoSortAction->setCheckable(true);
itemsMenu->addSeparator();
QAction *findItemsAction = itemsMenu->addAction(tr("&Find Items"));
findItemsAction->setShortcut(tr("Ctrl+F"));
menuBar()->addMenu(fileMenu);
menuBar()->addMenu(itemsMenu);
/* For convenient quoting:
QTreeWidget *treeWidget = new QTreeWidget(this);
*/
treeWidget = new QTreeWidget(this);
treeWidget->setColumnCount(2);
QStringList headers;
headers << tr("Subject") << tr("Default");
treeWidget->setHeaderLabels(headers);
connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
connect(ascendingAction, SIGNAL(triggered()), this, SLOT(sortAscending()));
connect(autoSortAction, SIGNAL(triggered()), this, SLOT(updateSortItems()));
connect(descendingAction, SIGNAL(triggered()), this, SLOT(sortDescending()));
connect(findItemsAction, SIGNAL(triggered()), this, SLOT(findItems()));
connect(insertAction, SIGNAL(triggered()), this, SLOT(insertItem()));
connect(removeAction, SIGNAL(triggered()), this, SLOT(removeItem()));
connect(treeWidget,
SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),
this, SLOT(updateMenus(QTreeWidgetItem *)));
setupTreeItems();
updateMenus(treeWidget->currentItem());
setCentralWidget(treeWidget);
setWindowTitle(tr("Tree Widget"));
}
void MainWindow::setupTreeItems()
{
QTreeWidgetItem *planets = new QTreeWidgetItem(treeWidget);
planets->setText(0, tr("Planets"));
(new QTreeWidgetItem(planets))->setText(0, tr("Mercury"));
(new QTreeWidgetItem(planets))->setText(0, tr("Venus"));
QTreeWidgetItem *earthItem = new QTreeWidgetItem(planets);
earthItem->setText(0, tr("Earth"));
earthItem->setText(1, tr("Yes"));
(new QTreeWidgetItem(planets))->setText(0, tr("Mars"));
(new QTreeWidgetItem(planets))->setText(0, tr("Jupiter"));
(new QTreeWidgetItem(planets))->setText(0, tr("Saturn"));
(new QTreeWidgetItem(planets))->setText(0, tr("Uranus"));
(new QTreeWidgetItem(planets))->setText(0, tr("Neptune"));
(new QTreeWidgetItem(planets))->setText(0, tr("Pluto"));
}
void MainWindow::findItems()
{
QString itemText = QInputDialog::getText(this, tr("Find Items"),
tr("Text to find:"));
if (itemText.isEmpty())
return;

QTreeWidgetItemIterator it(treeWidget);
while (*it) {
if ((*it)->text(0) == itemText)
(*it)->setSelected(true);
++it;
}
}
void MainWindow::insertItem()
{
QTreeWidgetItem *currentItem = treeWidget->currentItem();
if (!currentItem)
return;
QString itemText = QInputDialog::getText(this, tr("Insert Item"),
tr("Input text for the new item:"));
if (itemText.isEmpty())
return;
QTreeWidgetItem *parent = currentItem->parent();
QTreeWidgetItem *newItem;
if (parent)
newItem = new QTreeWidgetItem(parent, treeWidget->currentItem());
else
newItem = new QTreeWidgetItem(treeWidget, treeWidget->currentItem());
newItem->setText(0, itemText);
}
void MainWindow::removeItem()
{
QTreeWidgetItem *currentItem = treeWidget->currentItem();
if (!currentItem)
return;
QTreeWidgetItem *parent = currentItem->parent();
int index;
if (parent) {
index = parent->indexOfChild(treeWidget->currentItem());
delete parent->takeChild(index);
} else {
index = treeWidget->indexOfTopLevelItem(treeWidget->currentItem());
delete treeWidget->takeTopLevelItem(index);
}
}
void MainWindow::sortAscending()
{
treeWidget->sortItems(0, Qt::AscendingOrder);
}
void MainWindow::sortDescending()
{
treeWidget->sortItems(0, Qt::DescendingOrder);
}
void MainWindow::updateMenus(QTreeWidgetItem *current)
{
insertAction->setEnabled(current != 0);
removeAction->setEnabled(current != 0);
}
void MainWindow::updateSortItems()
{
ascendingAction->setEnabled(!autoSortAction->isChecked());
descendingAction->setEnabled(!autoSortAction->isChecked());
treeWidget->setSortingEnabled(autoSortAction->isChecked());
}
#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>

← Предыдущая	Версия 14:21, 25 мая 2010
(нет различий)

C++/Qt/QTreeWidgetItem - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...