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Diffstat (limited to 'doc/codesnippets/doc/src/snippets/modelview-subclasses')
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diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/main.cpp b/doc/codesnippets/doc/src/snippets/modelview-subclasses/main.cpp new file mode 100644 index 000000000..5502a8625 --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/main.cpp @@ -0,0 +1,69 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/* + 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(); +} diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp b/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp new file mode 100644 index 000000000..77bb17b0c --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp @@ -0,0 +1,153 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/* + 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; +} diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.h b/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.h new file mode 100644 index 000000000..329af23ec --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.h @@ -0,0 +1,71 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp b/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp new file mode 100644 index 000000000..3792cd3b8 --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp @@ -0,0 +1,315 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + 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; +} diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.h b/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.h new file mode 100644 index 000000000..38073d7b5 --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.h @@ -0,0 +1,91 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/window.cpp b/doc/codesnippets/doc/src/snippets/modelview-subclasses/window.cpp new file mode 100644 index 000000000..9af4ec7a3 --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/window.cpp @@ -0,0 +1,113 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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)); + } + } +} diff --git a/doc/codesnippets/doc/src/snippets/modelview-subclasses/window.h b/doc/codesnippets/doc/src/snippets/modelview-subclasses/window.h new file mode 100644 index 000000000..7c7e3da1c --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/modelview-subclasses/window.h @@ -0,0 +1,69 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 |