C++/Qt/QDesignerCustomWidgetInterface
extends QDesignerCustomWidgetInterface
<source lang="cpp"> Foundations of Qt Development\Chapter06\designerplugin\circlebar.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 <QPaintEvent>
- include <QWheelEvent>
- include <QPainter>
- include "circlebar.h"
CircleBar::CircleBar( QWidget *parent ) : QWidget( parent ) {
m_value = 0; QSizePolicy policy( QSizePolicy::Preferred, QSizePolicy::Preferred ); policy.setHeightForWidth( true ); setSizePolicy( policy );
} CircleBar::CircleBar( int value, QWidget *parent ) : QWidget( parent ) {
m_value = value; QSizePolicy policy( QSizePolicy::Preferred, QSizePolicy::Preferred ); policy.setHeightForWidth( true ); setSizePolicy( policy );
} int CircleBar::heightForWidth( int width ) const {
return width;
} QSize CircleBar::sizeHint() const {
return QSize( 100, 100 );
} int CircleBar::value() const {
return m_value;
} void CircleBar::setValue( int value ) {
if( value < 0 ) value = 0; if( value > 100 ) value = 100; if( m_value == value ) return; m_value = value; update(); emit valueChanged( m_value );
} void CircleBar::paintEvent( QPaintEvent *event ) {
int radius = width()/2; double factor = m_value/100.0; QPainter p( this ); p.setPen( Qt::black ); p.drawEllipse( 0, 0, width()-1, width()-1 ); p.setBrush( Qt::black ); p.drawEllipse( int(radius*(1.0-factor)), int(radius*(1.0-factor)), int((width()-1)*factor)+1, int((width()-1)*factor)+1 );
} void CircleBar::wheelEvent( QWheelEvent *event ) {
event->accept(); setValue( value() + event->delta()/20 );
}
Foundations of Qt Development\Chapter06\designerplugin\circlebar.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 CIRCLEBAR_H
- define CIRCLEBAR_H
- include <QWidget>
- include <QtDesigner>
class QDESIGNER_WIDGET_EXPORT CircleBar : public QWidget {
Q_OBJECT
public:
CircleBar( QWidget *parent = 0 ); CircleBar( int value = 0, QWidget *parent = 0 ); int value() const; int heightForWidth( int ) const; QSize sizeHint() const;
public slots:
void setValue( int );
signals:
void valueChanged( int );
protected:
void paintEvent( QPaintEvent* ); void wheelEvent( QWheelEvent* );
private:
int m_value;
};
- endif // CIRCLEBAR_H
Foundations of Qt Development\Chapter06\designerplugin\circlebarplugin.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 <QtPlugin>
- include <QExtensionManager>
- include <QDesignerFormEditorInterface>
- include <QTimer>
- include "circlebar.h"
- include "circlebarplugin.h"
CircleBarPlugin::CircleBarPlugin( QObject *parent ) {
m_initialized = false;
} bool CircleBarPlugin::isInitialized() const {
return m_initialized;
} void CircleBarPlugin::initialize( QDesignerFormEditorInterface *core ) {
if( m_initialized )
return;
m_initialized = true;
} bool CircleBarPlugin::isContainer() const {
return false;
} QIcon CircleBarPlugin::icon() const {
return QIcon();
} QString CircleBarPlugin::toolTip() const {
return "";
} QString CircleBarPlugin::whatsThis() const {
return "";
} QString CircleBarPlugin::codeTemplate() const {
return "";
} QString CircleBarPlugin::includeFile() const {
return "circlebar.h";
} QString CircleBarPlugin::name() const {
return "CircleBar";
} QString CircleBarPlugin::domXml() const {
return "<widget class=\"CircleBar\" name=\"circleBar\">\n"
"</widget>\n";
} QString CircleBarPlugin::group() const {
return "Book Widgets";
} QWidget *CircleBarPlugin::createWidget( QWidget *parent ) {
return new CircleBar( parent );
} Q_EXPORT_PLUGIN2( circleBarPlugin, CircleBarPlugin )
Foundations of Qt Development\Chapter06\designerplugin\circlebarplugin.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 CIRCLEBARPLUGIN_H
- define CIRCLEBARPLUGIN_H
- include <QDesignerCustomWidgetInterface>
class QExtensionManager; class CircleBarPlugin : public QObject, public QDesignerCustomWidgetInterface {
Q_OBJECT Q_INTERFACES(QDesignerCustomWidgetInterface)
public:
CircleBarPlugin( QObject *parent = 0 ); bool isContainer() const; bool isInitialized() const; QIcon icon() const; QString codeTemplate() const; QString domXml() const; QString group() const; QString includeFile() const; QString name() const; QString toolTip() const; QString whatsThis() const; QWidget *createWidget( QWidget *parent ); void initialize( QDesignerFormEditorInterface *core );
private:
bool m_initialized;
};
- endif /* CIRCLEBARPLUGIN_H */
</source>
Model view controller
<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 VIEW_H
- define VIEW_H
- include <QAbstractItemView>
- include <QItemSelection>
- include <QItemSelectionModel>
- include <QModelIndex>
- include <QRect>
- include <QSize>
- include <QWidget>
class LinearView : public QAbstractItemView {
Q_OBJECT
public:
LinearView(QWidget *parent = 0); QRect itemViewportRect(const QModelIndex &index) const; void ensureVisible(const QModelIndex &index); QModelIndex itemAt(int x, int y) const;
protected slots:
/*void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);*/ void rowsInserted(const QModelIndex &parent, int start, int end); void rowsRemoved(const QModelIndex &parent, int start, int end); /*void selectionChanged(const QItemSelection &deselected, const QItemSelection &selected); void verticalScrollbarAction(int action); void horizontalScrollbarAction(int action);*/
protected:
void setSelection(const QRect&, QItemSelectionModel::SelectionFlags command);
QRect selectionViewportRect(const QItemSelection &selection) const;
QRect itemRect(const QModelIndex &item) const;
bool isIndexHidden(const QModelIndex &index) const;
int horizontalOffset() const;
int verticalOffset() const;
QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction,
Qt::KeyboardModifiers modifiers);
void paintEvent(QPaintEvent *event);
void resizeEvent(QResizeEvent *event);
QSize sizeHint() const;
private:
int rows(const QModelIndex &index = QModelIndex()) const; void updateGeometries();
};
- endif
/*!
view.cpp Provides a view to represent a one-dimensional sequence of integers obtained from a list model as a series of rows.
- /
- include <QAbstractItemModel>
- include <QBrush>
- include <QItemSelection>
- include <QPainter>
- include <QPaintEvent>
- include <QPen>
- include <QPoint>
- include <QResizeEvent>
- include <QScrollBar>
- include <QSizePolicy>
- include "view.h"
LinearView::LinearView(QWidget *parent)
: QAbstractItemView(parent)
{
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
} /*!
Returns the position of the item in viewport coordinates.
- /
QRect LinearView::itemViewportRect(const QModelIndex &index) const {
QRect rect = itemRect(index);
QRect result(rect.left() - horizontalScrollBar()->value(),
rect.top() - verticalScrollBar()->value(),
rect.width(), viewport()->height());
return result;
} /*!
Returns the rectangle of the item at position \a index in the model. The rectangle is in contents coordinates.
- /
QRect LinearView::itemRect(const QModelIndex &index) const {
if (!index.isValid())
return QRect();
else
return QRect(index.row(), 0, 1, 1);
}
void LinearView::ensureVisible(const QModelIndex &index) {
QRect area = viewport()->rect();
QRect rect = itemViewportRect(index);
if (rect.left() < area.left())
horizontalScrollBar()->setValue(
horizontalScrollBar()->value() - rect.left());
else if (rect.right() > area.right())
horizontalScrollBar()->setValue(
horizontalScrollBar()->value() + rect.left() - area.width());
} /*!
Returns the item that covers the coordinate given in the view.
- /
QModelIndex LinearView::itemAt(int x, int /* y */) const {
int row = x + horizontalScrollBar()->value(); return model()->index(row, 0, QModelIndex());
} //void LinearView::dataChanged(const QModelIndex &/* topLeft */, // const QModelIndex &/* bottomRight */) //{ // updateGeometries(); // if (isVisible()) // repaint(); //} void LinearView::rowsInserted(const QModelIndex &/* parent */, int /* start */,
int /* end */)
{
updateGeometries();
if (isVisible())
repaint();
} void LinearView::rowsRemoved(const QModelIndex &/* parent */, int /* start */,
int /* end */)
{
updateGeometries();
if (isVisible())
repaint();
} /* void LinearView::verticalScrollbarAction(int action) { } void LinearView::horizontalScrollbarAction(int action) { }
- /
/*!
Select the items in the model that lie within the rectangle specified by \a rect, using the selection \a command.
- /
void LinearView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) {
QModelIndex leftIndex = itemAt(rect.left(), 0); QModelIndex rightIndex = itemAt(rect.right(), 0); QItemSelection selection(leftIndex, rightIndex); selectionModel()->select(selection, command);
} QModelIndex LinearView::moveCursor(QAbstractItemView::CursorAction cursorAction,
Qt::KeyboardModifiers)
{
QModelIndex current = currentIndex();
switch (cursorAction) {
case MoveLeft:{
if (current.row() > 0)
return model()->index(current.row() - 1, 0, QModelIndex());
else
return model()->index(0, 0, QModelIndex());
break;}
case MoveRight:{
if (current.row() < rows(current) - 1)
return model()->index(current.row() + 1, 0, QModelIndex());
else
return model()->index(rows(current) - 1, 0,QModelIndex());
break;}
case MoveUp:
return current;
case MoveDown:
return current;
case MovePageUp:
return current;
case MovePageDown:
return current;
case MoveHome:
return model()->index(0, 0, QModelIndex());
case MoveEnd:
return model()->index(rows(current) - 1, 0, QModelIndex());
default:
return current;
}
} int LinearView::horizontalOffset() const {
return horizontalScrollBar()->value();
} int LinearView::verticalOffset() const {
return verticalScrollBar()->value();
} /*!
Returns a rectangle corresponding to the selection in viewport cooridinates.
- /
QRect LinearView::selectionViewportRect(const QItemSelection &selection) const {
int ranges = selection.count();
if (ranges == 0)
return QRect();
// Note that we use the top and bottom functions of the selection range
// since the data is stored in rows.
int firstRow = selection.at(0).top();
int lastRow = selection.at(0).top();
for (int i = 0; i < ranges; ++i) {
firstRow = qMin(firstRow, selection.at(i).top());
lastRow = qMax(lastRow, selection.at(i).bottom());
}
QModelIndex firstItem = model()->index(qMin(firstRow, lastRow), 0,
QModelIndex());
QModelIndex lastItem = model()->index(qMax(firstRow, lastRow), 0,
QModelIndex());
QRect firstRect = itemViewportRect(firstItem);
QRect lastRect = itemViewportRect(lastItem);
return QRect(firstRect.left(), firstRect.top(),
lastRect.right() - firstRect.left(), firstRect.height());
} void LinearView::paintEvent(QPaintEvent *event) {
QPainter painter(viewport());
QRect updateRect = event->rect();
QBrush background(Qt::black);
QPen foreground(Qt::white);
painter.fillRect(updateRect, background);
painter.setPen(foreground);
QModelIndex firstItem = itemAt(updateRect.left(), updateRect.top());
if (!firstItem.isValid())
firstItem = model()->index(0, 0, QModelIndex());
QModelIndex lastItem = itemAt(updateRect.right(), updateRect.bottom());
if (!lastItem.isValid())
lastItem = model()->index(rows() - 1, 0, QModelIndex());
int x = updateRect.left();
//int top = updateRect.top();
//int bottom = updateRect.bottom();
int row = firstItem.row();
QModelIndex index = model()->index(row, 0, QModelIndex());
int value = model()->data(index, Qt::DisplayRole).toInt();
int midPoint = viewport()->height()/2;
int y2 = midPoint - int(value * midPoint/255.0);
while (row <= lastItem.row()) {
QModelIndex index = model()->index(row, 0, QModelIndex());
int value = model()->data(index, Qt::DisplayRole).toInt();
int y1 = y2;
y2 = midPoint - int(value * midPoint/255.0);
painter.drawLine(x-1, y1, x, y2);
++row; ++x;
}
} void LinearView::resizeEvent(QResizeEvent * /* event */) {
updateGeometries();
} void LinearView::updateGeometries() {
if (viewport()->width() < rows()) {
horizontalScrollBar()->setPageStep(viewport()->width());
horizontalScrollBar()->setRange(0, rows() - viewport()->width() - 1);
}
} QSize LinearView::sizeHint() const {
return QSize(rows(), 200);
} int LinearView::rows(const QModelIndex &index) const {
return model()->rowCount(model()->parent(index));
} bool LinearView::isIndexHidden(const QModelIndex &index) const {
return false;
}
- ifndef MODEL_H
- define MODEL_H
- include <QAbstractListModel>
- include <QObject>
- include <qvector.h>
class LinearModel : public QAbstractListModel {
Q_OBJECT
public:
LinearModel(QObject *parent = 0)
: QAbstractListModel(parent) {}
int rowCount(const QModelIndex &parent = QModelIndex()) const;
QModelIndex index(int row, int column = 0, const QModelIndex &parent = QModelIndex()) const;
QVariant data(const QModelIndex &index, int role) 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:
QVector<int> values;
};
- endif
/*
model.cpp A simple model that uses a QVector 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 LinearModel::rowCount(const QModelIndex &parent) const {
Q_USING(parent); return values.count();
} /*
Returns an appropriate value for the requested data. If the view requests an invalid index, an invalid variant is returned. If a header is requested then we just return the column or row number, depending on the orientation of the header. Any valid index that corresponds to a string in the list causes that string to be returned.
- /
/*!
Returns a model index for other component to use when referencing the item specified by the given row, column, and type. The parent index is ignored.
- /
QModelIndex LinearModel::index(int row, int column, const QModelIndex &parent) const {
if (parent == QModelIndex() && row >= 0 && row < rowCount()
&& column == 0)
return createIndex(row, column, 0);
else
return QModelIndex();
} QVariant LinearModel::data(const QModelIndex &index, int role) const {
Q_UNUSED(role);
if (!index.isValid())
return QVariant();
return values.at(index.row());
} /*!
Returns Qt::ItemIsEditable so that all items in the vector can be edited.
- /
Qt::ItemFlags LinearModel::flags(const QModelIndex &index) const {
// all items in the model are editable return QAbstractListModel::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 LinearModel::setData(const QModelIndex &index,
const QVariant &value, int role)
{
if (!index.isValid() || role != Qt::EditRole)
return false;
values.replace(index.row(), value.toInt());
emit dataChanged(index, index);
return true;
} /*!
Inserts a number of rows into the model at the specified position.
- /
bool LinearModel::insertRows(int position, int rows, const QModelIndex &parent) {
beginInsertRows(parent, position, position + rows - 1); values.insert(position, rows, 0); endInsertRows(); return true;
} /*!
Removes a number of rows from the model at the specified position.
- /
bool LinearModel::removeRows(int position, int rows, const QModelIndex &parent) {
beginRemoveRows(QModelIndex(), position, position+rows-1); values.remove(position, rows); endRemoveRows(); return true;
}
- ifndef WINDOW_H
- define WINDOW_H
- include <QMainWindow>
- include <QString>
- include <QWidget>
- include "model.h"
- include "view.h"
class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow::MainWindow(QWidget *parent = 0);
public slots:
void selectOpenFile();
private:
void setupModelView(); void openFile(const QString &fileName); LinearModel *model; LinearView *view;
};
- endif
- include <QAction>
- include <QDataStream>
- include <QMenu>
- include <QMenuBar>
- include <QFile>
- include <QFileDialog>
- include <QListView>
- include "window.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
setWindowTitle("Model/View example");
setupModelView();
QAction *openAction = new QAction(tr("&Open"), this);
QAction *quitAction = new QAction(tr("E&xit"), this);
QMenu *fileMenu = new QMenu(tr("&File"), this);
fileMenu->addAction(openAction);
fileMenu->addAction(quitAction);
menuBar()->addMenu(fileMenu);
connect(openAction, SIGNAL(triggered()), this, SLOT(selectOpenFile()));
connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
setCentralWidget(view);
} void MainWindow::setupModelView() {
model = new LinearModel(this); view = new LinearView(this); view->setModel(model);
} void MainWindow::selectOpenFile() {
QString fileName = QFileDialog::getOpenFileName(this,
tr("Select a file to open"), "", tr("Sound files (*.wav)"));
if (!fileName.isEmpty())
openFile(fileName);
} void MainWindow::openFile(const QString &fileName) {
QFile file(fileName);
int length = file.size();
if (file.open(QFile::ReadOnly)) {
model->removeRows(0, model->rowCount());
int rows = (length - 0x2c)/2;
model->insertRows(0, rows);
// Perform some dodgy tricks to extract the data from the file.
QDataStream stream(&file);
stream.setByteOrder(QDataStream::LittleEndian);
Q_INT16 left;
Q_INT16 right;
for (int row = 0; row < rows; ++row) {
QModelIndex index = model->index(row);
stream >> left >> right;
model->setData(index, int(left / 256));
}
}
}
/*
main.cpp An example of a main window application that used a subclassed model and view to display data from sound files.
- /
- include <QApplication>
- include "model.h"
- include "view.h"
- include "window.h"
/*!
The main function for the linear model example. This creates and populates a model with long integers then displays the contents of the model using a QListView widget.
- /
int main(int argc, char *argv[]) {
QApplication app(argc, argv); MainWindow *window = new MainWindow; window->show(); return app.exec();
}
</source>
