C++/Qt/Drag Drop
Содержание
Drag and drop
<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 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();
}
</source>
Drag and drop text
<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 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("Drag the icon to a filer " "window or the desktop background:
"), 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();
}
</source>
Drag Drop List Model
<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 <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();
}
</source>
Drop action
<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 <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();
}
</source>
Drop event
<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 <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();
}
</source>
Drop rectangle
<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 <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();
}
</source>
Port for drop event
<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 <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();
}
</source>
