C++/Qt/Drag Drop
Содержание
Drag and drop
/****************************************************************************
**
** 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 DRAGWIDGET_H
#define DRAGWIDGET_H
#include <QByteArray>
#include <QFrame>
#include <QString>
#include <QStringList>
class QComboBox;
class QFrame;
class QLabel;
class QTextBrowser;
class DragWidget : public QFrame
{
Q_OBJECT
public:
DragWidget(QWidget *parent);
void setData(const QString &mimetype, const QByteArray &newData);
signals:
void dragResult(const QString &actionText);
void mimeTypes(const QStringList &types);
protected:
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void mousePressEvent(QMouseEvent *event);
private:
QByteArray data;
QLabel *dragDropLabel;
QPoint dragStartPosition;
QString mimeType;
};
#endif
#include <QtGui>
#include "dragwidget.h"
DragWidget::DragWidget(QWidget *parent)
: QFrame(parent)
{
setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
dragDropLabel = new QLabel("", this);
dragDropLabel->setAlignment(Qt::AlignHCenter);
QHBoxLayout *layout = new QHBoxLayout(this);
layout->addStretch(0);
layout->addWidget(dragDropLabel);
layout->addStretch(0);
setAcceptDrops(true);
}
// Accept all actions, but deal with them separately later.
void DragWidget::dragEnterEvent(QDragEnterEvent *event)
{
event->acceptProposedAction();
}
void DragWidget::dropEvent(QDropEvent *event)
{
if (event->source() == this && event->possibleActions() & Qt::MoveAction)
return;
if (event->proposedAction() == Qt::MoveAction) {
event->acceptProposedAction();
// Process the data from the event.
emit dragResult(tr("The data was moved here."));
} else if (event->proposedAction() == Qt::CopyAction) {
event->acceptProposedAction();
// Process the data from the event.
emit dragResult(tr("The data was copied here."));
} else {
// Ignore the drop.
return;
}
// End of quote
emit mimeTypes(event->mimeData()->formats());
setData(event->mimeData()->formats()[0],
event->mimeData()->data(event->mimeData()->formats()[0]));
}
void DragWidget::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
dragStartPosition = event->pos();
}
void DragWidget::mouseMoveEvent(QMouseEvent *event)
{
if (!(event->buttons() & Qt::LeftButton))
return;
if ((event->pos() - dragStartPosition).manhattanLength()
< QApplication::startDragDistance())
return;
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setData(mimeType, data);
drag->setMimeData(mimeData);
Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction);
switch (dropAction) {
case Qt::CopyAction:
emit dragResult(tr("The text was copied."));
break;
case Qt::MoveAction:
emit dragResult(tr("The text was moved."));
break;
default:
emit dragResult(tr("Unknown action."));
break;
}
}
void DragWidget::setData(const QString &mimetype, const QByteArray &newData)
{
mimeType = mimetype;
data = QByteArray(newData);
dragDropLabel->setText(tr("%1 bytes").arg(data.size()));
QStringList formats;
formats << mimetype;
emit mimeTypes(formats);
}
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QPixmap>
#include <QPoint>
class QComboBox;
class QLabel;
class QLineEdit;
class QMouseEvent;
class QTextEdit;
class DragWidget;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
public slots:
void setDragResult(const QString &actionText);
void setMimeTypes(const QStringList &types);
private:
QComboBox *mimeTypeCombo;
DragWidget *dragWidget;
};
#endif
#include <QtGui>
#include "dragwidget.h"
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QFrame *centralWidget = new QFrame(this);
QLabel *mimeTypeLabel = new QLabel(tr("MIME types:"), centralWidget);
mimeTypeCombo = new QComboBox(centralWidget);
QLabel *dataLabel = new QLabel(tr("Amount of data (bytes):"), centralWidget);
dragWidget = new DragWidget(centralWidget);
connect(dragWidget, SIGNAL(mimeTypes(const QStringList &)),
this, SLOT(setMimeTypes(const QStringList &)));
connect(dragWidget, SIGNAL(dragResult(const QString &)),
this, SLOT(setDragResult(const QString &)));
QVBoxLayout *mainLayout = new QVBoxLayout(centralWidget);
mainLayout->addWidget(mimeTypeLabel);
mainLayout->addWidget(mimeTypeCombo);
mainLayout->addSpacing(32);
mainLayout->addWidget(dataLabel);
mainLayout->addWidget(dragWidget);
statusBar();
dragWidget->setData(QString("text/plain"), QByteArray("Hello world"));
setCentralWidget(centralWidget);
setWindowTitle(tr("Drag and Drop"));
}
void MainWindow::setDragResult(const QString &actionText)
{
statusBar()->showMessage(actionText);
}
void MainWindow::setMimeTypes(const QStringList &types)
{
mimeTypeCombo->clear();
mimeTypeCombo->addItems(types);
}
#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow *window1 = new MainWindow;
MainWindow *window2 = new MainWindow;
window1->show();
window2->show();
return app.exec();
}
Drag and drop text
/****************************************************************************
**
** 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 MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QPixmap>
#include <QPoint>
class QLabel;
class QLineEdit;
class QMouseEvent;
class QTextEdit;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
protected:
void mousePressEvent(QMouseEvent *event);
private:
QLabel *iconLabel;
QLineEdit *nameEdit;
QPixmap iconPixmap;
QPoint dragStartPosition;
QTextEdit *commentEdit;
};
#endif
#include <QtGui>
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QFrame *centralFrame = new QFrame(this);
QLabel *nameLabel = new QLabel(tr("Comment:"), centralFrame);
commentEdit = new QTextEdit(centralFrame);
QLabel *dragLabel = new QLabel(tr("<p>Drag the icon to a filer "
"window or the desktop background:</p>"),
centralFrame);
iconLabel = new QLabel(centralFrame);
iconPixmap.load(":/images/file.png");
iconLabel->setPixmap(iconPixmap);
QGridLayout *grid = new QGridLayout(centralFrame);
grid->addWidget(nameLabel, 0, 0);
grid->addWidget(commentEdit, 1, 0, 1, 2);
grid->addWidget(dragLabel, 2, 0);
grid->addWidget(iconLabel, 2, 1);
statusBar();
setCentralWidget(centralFrame);
setWindowTitle(tr("Dragging"));
}
void MainWindow::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton
&& iconLabel->geometry().contains(event->pos())) {
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setText(commentEdit->toPlainText());
drag->setMimeData(mimeData);
drag->setPixmap(iconPixmap);
Qt::DropAction dropAction = drag->exec();
QString actionText;
switch (dropAction) {
case Qt::CopyAction:
actionText = tr("The text was copied.");
break;
case Qt::MoveAction:
actionText = tr("The text was moved.");
break;
case Qt::LinkAction:
actionText = tr("The text was linked.");
break;
case Qt::IgnoreAction:
actionText = tr("The drag was ignored.");
break;
default:
actionText = tr("Unknown action.");
break;
}
statusBar()->showMessage(actionText);
}
}
#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow *window = new MainWindow;
window->show();
return app.exec();
}
Drag Drop List Model
/****************************************************************************
**
** 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 <QObject>
#include <QStringListModel>
class DragDropListModel : public QStringListModel
{
Q_OBJECT
public:
DragDropListModel(const QStringList &strings, QObject *parent = 0);
Qt::ItemFlags flags(const QModelIndex &index) const;
bool dropMimeData(const QMimeData *data, Qt::DropAction action,
int row, int column, const QModelIndex &parent);
QMimeData *mimeData(const QModelIndexList &indexes) const;
QStringList mimeTypes() const;
Qt::DropActions supportedDropActions() const;
};
#endif
/*
model.cpp
A simple model that uses a QStringList as its data source.
*/
#include <QtGui>
#include "model.h"
DragDropListModel::DragDropListModel(const QStringList &strings,
QObject *parent)
: QStringListModel(strings, parent)
{
}
bool DragDropListModel::dropMimeData(const QMimeData *data,
Qt::DropAction action, int row, int column, const QModelIndex &parent)
{
if (action == Qt::IgnoreAction)
return true;
if (!data->hasFormat("application/vnd.text.list"))
return false;
if (column > 0)
return false;
int beginRow;
if (row != -1)
beginRow = row;
else if (parent.isValid())
beginRow = parent.row();
else
beginRow = rowCount(QModelIndex());
QByteArray encodedData = data->data("application/vnd.text.list");
QDataStream stream(&encodedData, QIODevice::ReadOnly);
QStringList newItems;
int rows = 0;
while (!stream.atEnd()) {
QString text;
stream >> text;
newItems << text;
++rows;
}
insertRows(beginRow, rows, QModelIndex());
foreach (QString text, newItems) {
QModelIndex idx = index(beginRow, 0, QModelIndex());
setData(idx, text);
beginRow++;
}
return true;
}
Qt::ItemFlags DragDropListModel::flags(const QModelIndex &index) const
{
Qt::ItemFlags defaultFlags = QStringListModel::flags(index);
if (index.isValid())
return Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | defaultFlags;
else
return Qt::ItemIsDropEnabled | defaultFlags;
}
QMimeData *DragDropListModel::mimeData(const QModelIndexList &indexes) const
{
QMimeData *mimeData = new QMimeData();
QByteArray encodedData;
QDataStream stream(&encodedData, QIODevice::WriteOnly);
foreach (QModelIndex index, indexes) {
if (index.isValid()) {
QString text = data(index, Qt::DisplayRole).toString();
stream << text;
}
}
mimeData->setData("application/vnd.text.list", encodedData);
return mimeData;
}
QStringList DragDropListModel::mimeTypes() const
{
QStringList types;
types << "application/vnd.text.list";
return types;
}
Qt::DropActions DragDropListModel::supportedDropActions() const
{
return Qt::CopyAction | Qt::MoveAction;
}
#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QListView;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
private:
void setupListItems();
QListView *listView;
};
#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"));
menuBar()->addMenu(fileMenu);
// For convenient quoting:
QListView *listView = new QListView(this);
listView->setSelectionMode(QAbstractItemView::ExtendedSelection);
listView->setDragEnabled(true);
listView->setAcceptDrops(true);
listView->setDropIndicatorShown(true);
this->listView = listView;
connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
setupListItems();
setCentralWidget(listView);
setWindowTitle(tr("List View"));
}
void MainWindow::setupListItems()
{
QStringList items;
items << tr("Oak") << tr("Fir") << tr("Pine") << tr("Birch") << tr("Hazel")
<< tr("Redwood") << tr("Sycamore") << tr("Chestnut")
<< tr("Mahogany");
DragDropListModel *model = new DragDropListModel(items, this);
listView->setModel(model);
}
#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow *window = new MainWindow;
window->show();
return app.exec();
}
Drop action
/****************************************************************************
**
** 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 <QString>
#include <QStringList>
#include <QWidget>
class QComboBox;
class QFrame;
class QTextBrowser;
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
protected:
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
private:
QComboBox *mimeTypeCombo;
QFrame *dropFrame;
QTextBrowser *textBrowser;
QString oldText;
QStringList oldMimeTypes;
};
#endif
#include <QtGui>
#include "window.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
QLabel *textLabel = new QLabel(tr("Data:"), this);
textBrowser = new QTextBrowser(this);
QLabel *mimeTypeLabel = new QLabel(tr("MIME types:"), this);
mimeTypeCombo = new QComboBox(this);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(textLabel);
layout->addWidget(textBrowser);
layout->addWidget(mimeTypeLabel);
layout->addWidget(mimeTypeCombo);
/*
...
setAcceptDrops(true);
*/
setAcceptDrops(true);
setWindowTitle(tr("Drop Actions"));
}
void Window::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasFormat("text/plain"))
event->acceptProposedAction();
}
void Window::dropEvent(QDropEvent *event)
{
QMenu actionMenu(this);
QAction *copyAction = 0;
QAction *moveAction = 0;
QAction *linkAction = 0;
QAction *ignoreAction = 0;
if (event->possibleActions() & Qt::CopyAction)
copyAction = actionMenu.addAction(tr("Copy"));
if (event->possibleActions() & Qt::MoveAction)
moveAction = actionMenu.addAction(tr("Move"));
if (event->possibleActions() & Qt::LinkAction)
linkAction = actionMenu.addAction(tr("Link"));
if (event->possibleActions() & Qt::IgnoreAction)
ignoreAction = actionMenu.addAction(tr("Ignore"));
QAction *result = actionMenu.exec(QCursor::pos());
if (copyAction && result == copyAction)
event->setDropAction(Qt::CopyAction);
else if (moveAction && result == moveAction)
event->setDropAction(Qt::MoveAction);
else if (linkAction && result == linkAction)
event->setDropAction(Qt::LinkAction);
else {
event->setDropAction(Qt::IgnoreAction);
return;
}
textBrowser->setPlainText(event->mimeData()->text());
mimeTypeCombo->clear();
mimeTypeCombo->addItems(event->mimeData()->formats());
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window *window = new Window;
window->show();
return app.exec();
}
Drop event
/****************************************************************************
**
** 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 <QString>
#include <QStringList>
#include <QWidget>
class QComboBox;
class QFrame;
class QTextBrowser;
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
protected:
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
private:
QComboBox *mimeTypeCombo;
QFrame *dropFrame;
QTextBrowser *textBrowser;
QString oldText;
QStringList oldMimeTypes;
};
#endif
#include <QtGui>
#include "window.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
QLabel *textLabel = new QLabel(tr("Data:"), this);
textBrowser = new QTextBrowser(this);
QLabel *mimeTypeLabel = new QLabel(tr("MIME types:"), this);
mimeTypeCombo = new QComboBox(this);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(textLabel);
layout->addWidget(textBrowser);
layout->addWidget(mimeTypeLabel);
layout->addWidget(mimeTypeCombo);
setAcceptDrops(true);
setWindowTitle(tr("Drop Events"));
}
void Window::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasFormat("text/plain"))
event->acceptProposedAction();
}
void Window::dropEvent(QDropEvent *event)
{
textBrowser->setPlainText(event->mimeData()->text());
mimeTypeCombo->clear();
mimeTypeCombo->addItems(event->mimeData()->formats());
event->acceptProposedAction();
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window *window = new Window;
window->show();
return app.exec();
}
Drop rectangle
/****************************************************************************
**
** 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 <QString>
#include <QStringList>
#include <QWidget>
class QComboBox;
class QFrame;
class QTextBrowser;
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
protected:
void dragMoveEvent(QDragMoveEvent *event);
void dropEvent(QDropEvent *event);
private:
QComboBox *mimeTypeCombo;
QFrame *dropFrame;
QTextBrowser *textBrowser;
QString oldText;
QStringList oldMimeTypes;
};
#endif
#include <QtGui>
#include "window.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
QLabel *textLabel = new QLabel(tr("Data:"), this);
textBrowser = new QTextBrowser(this);
QLabel *mimeTypeLabel = new QLabel(tr("MIME types:"), this);
mimeTypeCombo = new QComboBox(this);
dropFrame = new QFrame(this);
dropFrame->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
QLabel *dropLabel = new QLabel(tr("Drop items here"), dropFrame);
dropLabel->setAlignment(Qt::AlignHCenter);
QVBoxLayout *dropFrameLayout = new QVBoxLayout(dropFrame);
dropFrameLayout->addWidget(dropLabel);
QHBoxLayout *dropLayout = new QHBoxLayout;
dropLayout->addStretch(0);
dropLayout->addWidget(dropFrame);
dropLayout->addStretch(0);
QVBoxLayout *mainLayout = new QVBoxLayout(this);
mainLayout->addWidget(textLabel);
mainLayout->addWidget(textBrowser);
mainLayout->addWidget(mimeTypeLabel);
mainLayout->addWidget(mimeTypeCombo);
mainLayout->addSpacing(32);
mainLayout->addLayout(dropLayout);
setAcceptDrops(true);
setWindowTitle(tr("Drop Rectangle"));
}
void Window::dragMoveEvent(QDragMoveEvent *event)
{
if (event->mimeData()->hasFormat("text/plain")
&& event->answerRect().intersects(dropFrame->geometry()))
event->acceptProposedAction();
}
void Window::dropEvent(QDropEvent *event)
{
textBrowser->setPlainText(event->mimeData()->text());
mimeTypeCombo->clear();
mimeTypeCombo->addItems(event->mimeData()->formats());
event->acceptProposedAction();
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window *window = new Window;
window->show();
return app.exec();
}
Port for drop event
/****************************************************************************
**
** 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 <QString>
#include <QStringList>
#include <QWidget>
class QComboBox;
class QFrame;
class QLabel;
class MyWidget : public QWidget
{
Q_OBJECT
public:
MyWidget(QWidget *parent = 0);
protected:
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
void mousePressEvent(QMouseEvent *event);
private:
QComboBox *mimeTypeCombo;
QFrame *dropFrame;
QLabel *dataLabel;
QString oldText;
QStringList oldMimeTypes;
};
#endif
#include <QtGui>
#include "window.h"
MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{
QLabel *textLabel = new QLabel(tr("Data:"), this);
dataLabel = new QLabel(this);
dataLabel->setFixedSize(200, 200);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(textLabel);
layout->addWidget(dataLabel);
setAcceptDrops(true);
setWindowTitle(tr("Drop Events"));
}
void MyWidget::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasText() || event->mimeData()->hasImage())
event->acceptProposedAction();
}
void MyWidget::dropEvent(QDropEvent *event)
{
if (event->mimeData()->hasText())
dataLabel->setText(event->mimeData()->text());
else if (event->mimeData()->hasImage()) {
QVariant imageData = event->mimeData()->imageData();
dataLabel->setPixmap(qvariant_cast<QPixmap>(imageData));
}
event->acceptProposedAction();
}
void MyWidget::mousePressEvent(QMouseEvent *event)
{
QString text = dataLabel->text();
QPixmap iconPixmap(32, 32);
iconPixmap.fill(qRgba(255, 0, 0, 127));
QImage image(100, 100, QImage::Format_RGB32);
image.fill(qRgb(0, 0, 255));
if (event->button() == Qt::LeftButton) {
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setText(text);
mimeData->setImageData(image);
drag->setMimeData(mimeData);
drag->setPixmap(iconPixmap);
Qt::DropAction dropAction = drag->exec();
// ...
event->accept();
}
else if (event->button() == Qt::MidButton) {
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setImageData(image);
drag->setMimeData(mimeData);
drag->setPixmap(iconPixmap);
Qt::DropAction dropAction = drag->exec();
// ...
event->accept();
}
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWidget window;
window.show();
return app.exec();
}