mainwindow.cpp Example File

mainwindows/mainwindow/mainwindow.cpp
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "mainwindow.h"
#include "colorswatch.h"
#include "toolbar.h"

#include <QAction>
#include <QLayout>
#include <QMenu>
#include <QMenuBar>
#include <QStatusBar>
#include <QTextEdit>
#include <QFile>
#include <QDataStream>
#include <QFileDialog>
#include <QMessageBox>
#include <QSignalMapper>
#include <QApplication>
#include <QPainter>
#include <QMouseEvent>
#include <QLineEdit>
#include <QComboBox>
#include <QLabel>
#include <QPushButton>
#include <qdebug.h>

static const char * const message =
    "<p><b>Qt Main Window Example</b></p>"

    "<p>This is a demonstration of the QMainWindow, QToolBar and "
    "QDockWidget classes.</p>"

    "<p>The tool bar and dock widgets can be dragged around and rearranged "
    "using the mouse or via the menu.</p>"

    "<p>Each dock widget contains a colored frame and a context "
    "(right-click) menu.</p>"

#ifdef Q_OS_MAC
    "<p>On OS X, the \"Black\" dock widget has been created as a "
    "<em>Drawer</em>, which is a special kind of QDockWidget.</p>"
#endif
    ;

Q_DECLARE_METATYPE(QDockWidget::DockWidgetFeatures)

MainWindow::MainWindow(const QMap<QString, QSize> &customSizeHints,
                        QWidget *parent, Qt::WindowFlags flags)
    : QMainWindow(parent, flags)
{
    setObjectName("MainWindow");
    setWindowTitle("Qt Main Window Example");

    center = new QTextEdit(this);
    center->setReadOnly(true);
    center->setMinimumSize(400, 205);
    setCentralWidget(center);

    setupToolBar();
    setupMenuBar();
    setupDockWidgets(customSizeHints);

    statusBar()->showMessage(tr("Status Bar"));
}

void MainWindow::actionTriggered(QAction *action)
{
    qDebug("action '%s' triggered", action->text().toLocal8Bit().data());
}

void MainWindow::setupToolBar()
{
#ifdef Q_OS_OSX
    setUnifiedTitleAndToolBarOnMac(true);
#endif

    for (int i = 0; i < 3; ++i) {
        ToolBar *tb = new ToolBar(QString::fromLatin1("Tool Bar %1").arg(i + 1), this);
        toolBars.append(tb);
        addToolBar(tb);
    }
}

void MainWindow::setupMenuBar()
{
    QMenu *menu = menuBar()->addMenu(tr("&File"));

    QAction *action = menu->addAction(tr("Save layout..."));
    connect(action, SIGNAL(triggered()), this, SLOT(saveLayout()));

    action = menu->addAction(tr("Load layout..."));
    connect(action, SIGNAL(triggered()), this, SLOT(loadLayout()));

    action = menu->addAction(tr("Switch layout direction"));
    connect(action, SIGNAL(triggered()), this, SLOT(switchLayoutDirection()));

    menu->addSeparator();

    menu->addAction(tr("&Quit"), this, SLOT(close()));

    mainWindowMenu = menuBar()->addMenu(tr("Main window"));

    action = mainWindowMenu->addAction(tr("Animated docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AnimatedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Allow nested docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AllowNestedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Allow tabbed docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AllowTabbedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Force tabbed docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & ForceTabbedDocks);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    action = mainWindowMenu->addAction(tr("Vertical tabs"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & VerticalTabs);
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setDockOptions()));

    QMenu *toolBarMenu = menuBar()->addMenu(tr("Tool bars"));
    for (int i = 0; i < toolBars.count(); ++i)
        toolBarMenu->addMenu(toolBars.at(i)->menu);

#ifdef Q_OS_OSX
    toolBarMenu->addSeparator();

    action = toolBarMenu->addAction(tr("Unified"));
    action->setCheckable(true);
    action->setChecked(unifiedTitleAndToolBarOnMac());
    connect(action, SIGNAL(toggled(bool)), this, SLOT(setUnifiedTitleAndToolBarOnMac(bool)));
#endif

    dockWidgetMenu = menuBar()->addMenu(tr("&Dock Widgets"));
}

void MainWindow::setDockOptions()
{
    DockOptions opts;
    QList<QAction*> actions = mainWindowMenu->actions();

    if (actions.at(0)->isChecked())
        opts |= AnimatedDocks;
    if (actions.at(1)->isChecked())
        opts |= AllowNestedDocks;
    if (actions.at(2)->isChecked())
        opts |= AllowTabbedDocks;
    if (actions.at(3)->isChecked())
        opts |= ForceTabbedDocks;
    if (actions.at(4)->isChecked())
        opts |= VerticalTabs;

    QMainWindow::setDockOptions(opts);
}

void MainWindow::saveLayout()
{
    QString fileName
        = QFileDialog::getSaveFileName(this, tr("Save layout"));
    if (fileName.isEmpty())
        return;
    QFile file(fileName);
    if (!file.open(QFile::WriteOnly)) {
        QString msg = tr("Failed to open %1\n%2")
                        .arg(fileName)
                        .arg(file.errorString());
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }

    QByteArray geo_data = saveGeometry();
    QByteArray layout_data = saveState();

    bool ok = file.putChar((uchar)geo_data.size());
    if (ok)
        ok = file.write(geo_data) == geo_data.size();
    if (ok)
        ok = file.write(layout_data) == layout_data.size();

    if (!ok) {
        QString msg = tr("Error writing to %1\n%2")
                        .arg(fileName)
                        .arg(file.errorString());
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }
}

void MainWindow::loadLayout()
{
    QString fileName
        = QFileDialog::getOpenFileName(this, tr("Load layout"));
    if (fileName.isEmpty())
        return;
    QFile file(fileName);
    if (!file.open(QFile::ReadOnly)) {
        QString msg = tr("Failed to open %1\n%2")
                        .arg(fileName)
                        .arg(file.errorString());
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }

    uchar geo_size;
    QByteArray geo_data;
    QByteArray layout_data;

    bool ok = file.getChar((char*)&geo_size);
    if (ok) {
        geo_data = file.read(geo_size);
        ok = geo_data.size() == geo_size;
    }
    if (ok) {
        layout_data = file.readAll();
        ok = layout_data.size() > 0;
    }

    if (ok)
        ok = restoreGeometry(geo_data);
    if (ok)
        ok = restoreState(layout_data);

    if (!ok) {
        QString msg = tr("Error reading %1")
                        .arg(fileName);
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }
}

QAction *addAction(QMenu *menu, const QString &text, QActionGroup *group, QSignalMapper *mapper,
                    int id)
{
    bool first = group->actions().isEmpty();
    QAction *result = menu->addAction(text);
    result->setCheckable(true);
    result->setChecked(first);
    group->addAction(result);
    QObject::connect(result, SIGNAL(triggered()), mapper, SLOT(map()));
    mapper->setMapping(result, id);
    return result;
}

void MainWindow::setupDockWidgets(const QMap<QString, QSize> &customSizeHints)
{
    qRegisterMetaType<QDockWidget::DockWidgetFeatures>();

    mapper = new QSignalMapper(this);
    connect(mapper, SIGNAL(mapped(int)), this, SLOT(setCorner(int)));

    QMenu *corner_menu = dockWidgetMenu->addMenu(tr("Top left corner"));
    QActionGroup *group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Top dock area"), group, mapper, 0);
    ::addAction(corner_menu, tr("Left dock area"), group, mapper, 1);

    corner_menu = dockWidgetMenu->addMenu(tr("Top right corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Top dock area"), group, mapper, 2);
    ::addAction(corner_menu, tr("Right dock area"), group, mapper, 3);

    corner_menu = dockWidgetMenu->addMenu(tr("Bottom left corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Bottom dock area"), group, mapper, 4);
    ::addAction(corner_menu, tr("Left dock area"), group, mapper, 5);

    corner_menu = dockWidgetMenu->addMenu(tr("Bottom right corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    ::addAction(corner_menu, tr("Bottom dock area"), group, mapper, 6);
    ::addAction(corner_menu, tr("Right dock area"), group, mapper, 7);

    dockWidgetMenu->addSeparator();

    static const struct Set {
        const char * name;
        uint flags;
        Qt::DockWidgetArea area;
    } sets [] = {
#ifndef Q_OS_MAC
        { "Black", 0, Qt::LeftDockWidgetArea },
#else
        { "Black", Qt::Drawer, Qt::LeftDockWidgetArea },
#endif
        { "White", 0, Qt::RightDockWidgetArea },
        { "Red", 0, Qt::TopDockWidgetArea },
        { "Green", 0, Qt::TopDockWidgetArea },
        { "Blue", 0, Qt::BottomDockWidgetArea },
        { "Yellow", 0, Qt::BottomDockWidgetArea }
    };
    const int setCount = sizeof(sets) / sizeof(Set);

    for (int i = 0; i < setCount; ++i) {
        ColorSwatch *swatch = new ColorSwatch(tr(sets[i].name), this, Qt::WindowFlags(sets[i].flags));
        if (i%2)
            swatch->setWindowIcon(QIcon(QPixmap(":/res/qt.png")));
        if (qstrcmp(sets[i].name, "Blue") == 0) {
            BlueTitleBar *titlebar = new BlueTitleBar(swatch);
            swatch->setTitleBarWidget(titlebar);
            connect(swatch, SIGNAL(topLevelChanged(bool)), titlebar, SLOT(updateMask()));
            connect(swatch, SIGNAL(featuresChanged(QDockWidget::DockWidgetFeatures)), titlebar, SLOT(updateMask()), Qt::QueuedConnection);

        }

        QString name = QString::fromLatin1(sets[i].name);
        if (customSizeHints.contains(name))
            swatch->setCustomSizeHint(customSizeHints.value(name));

        addDockWidget(sets[i].area, swatch);
        dockWidgetMenu->addMenu(swatch->menu);
    }

    createDockWidgetAction = new QAction(tr("Add dock widget..."), this);
    connect(createDockWidgetAction, SIGNAL(triggered()), this, SLOT(createDockWidget()));
    destroyDockWidgetMenu = new QMenu(tr("Destroy dock widget"), this);
    destroyDockWidgetMenu->setEnabled(false);
    connect(destroyDockWidgetMenu, SIGNAL(triggered(QAction*)), this, SLOT(destroyDockWidget(QAction*)));

    dockWidgetMenu->addSeparator();
    dockWidgetMenu->addAction(createDockWidgetAction);
    dockWidgetMenu->addMenu(destroyDockWidgetMenu);
}

void MainWindow::setCorner(int id)
{
    switch (id) {
        case 0:
            QMainWindow::setCorner(Qt::TopLeftCorner, Qt::TopDockWidgetArea);
            break;
        case 1:
            QMainWindow::setCorner(Qt::TopLeftCorner, Qt::LeftDockWidgetArea);
            break;
        case 2:
            QMainWindow::setCorner(Qt::TopRightCorner, Qt::TopDockWidgetArea);
            break;
        case 3:
            QMainWindow::setCorner(Qt::TopRightCorner, Qt::RightDockWidgetArea);
            break;
        case 4:
            QMainWindow::setCorner(Qt::BottomLeftCorner, Qt::BottomDockWidgetArea);
            break;
        case 5:
            QMainWindow::setCorner(Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);
            break;
        case 6:
            QMainWindow::setCorner(Qt::BottomRightCorner, Qt::BottomDockWidgetArea);
            break;
        case 7:
            QMainWindow::setCorner(Qt::BottomRightCorner, Qt::RightDockWidgetArea);
            break;
    }
}

void MainWindow::showEvent(QShowEvent *event)
{
    QMainWindow::showEvent(event);
}

void MainWindow::switchLayoutDirection()
{
    if (layoutDirection() == Qt::LeftToRight)
        qApp->setLayoutDirection(Qt::RightToLeft);
    else
        qApp->setLayoutDirection(Qt::LeftToRight);
}

class CreateDockWidgetDialog : public QDialog
{
public:
    CreateDockWidgetDialog(QWidget *parent = 0);

    QString objectName() const;
    Qt::DockWidgetArea location() const;

private:
    QLineEdit *m_objectName;
    QComboBox *m_location;
};

CreateDockWidgetDialog::CreateDockWidgetDialog(QWidget *parent)
    : QDialog(parent)
{
    QGridLayout *layout = new QGridLayout(this);

    layout->addWidget(new QLabel(tr("Object name:")), 0, 0);
    m_objectName = new QLineEdit;
    layout->addWidget(m_objectName, 0, 1);

    layout->addWidget(new QLabel(tr("Location:")), 1, 0);
    m_location = new QComboBox;
    m_location->setEditable(false);
    m_location->addItem(tr("Top"));
    m_location->addItem(tr("Left"));
    m_location->addItem(tr("Right"));
    m_location->addItem(tr("Bottom"));
    m_location->addItem(tr("Restore"));
    layout->addWidget(m_location, 1, 1);

    QHBoxLayout *buttonLayout = new QHBoxLayout;
    layout->addLayout(buttonLayout, 2, 0, 1, 2);
    buttonLayout->addStretch();

    QPushButton *cancelButton = new QPushButton(tr("Cancel"));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
    buttonLayout->addWidget(cancelButton);
    QPushButton *okButton = new QPushButton(tr("Ok"));
    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    buttonLayout->addWidget(okButton);

    okButton->setDefault(true);
}

QString CreateDockWidgetDialog::objectName() const
{
    return m_objectName->text();
}

Qt::DockWidgetArea CreateDockWidgetDialog::location() const
{
    switch (m_location->currentIndex()) {
        case 0: return Qt::TopDockWidgetArea;
        case 1: return Qt::LeftDockWidgetArea;
        case 2: return Qt::RightDockWidgetArea;
        case 3: return Qt::BottomDockWidgetArea;
        default:
            break;
    }
    return Qt::NoDockWidgetArea;
}

void MainWindow::createDockWidget()
{
    CreateDockWidgetDialog dialog(this);
    int ret = dialog.exec();
    if (ret == QDialog::Rejected)
        return;

    QDockWidget *dw = new QDockWidget;
    dw->setObjectName(dialog.objectName());
    dw->setWindowTitle(dialog.objectName());
    dw->setWidget(new QTextEdit);

    Qt::DockWidgetArea area = dialog.location();
    switch (area) {
        case Qt::LeftDockWidgetArea:
        case Qt::RightDockWidgetArea:
        case Qt::TopDockWidgetArea:
        case Qt::BottomDockWidgetArea:
            addDockWidget(area, dw);
            break;
        default:
            if (!restoreDockWidget(dw)) {
                QMessageBox::warning(this, QString(), tr("Failed to restore dock widget"));
                delete dw;
                return;
            }
            break;
    }

    extraDockWidgets.append(dw);
    destroyDockWidgetMenu->setEnabled(true);
    destroyDockWidgetMenu->addAction(new QAction(dialog.objectName(), this));
}

void MainWindow::destroyDockWidget(QAction *action)
{
    int index = destroyDockWidgetMenu->actions().indexOf(action);
    delete extraDockWidgets.takeAt(index);
    destroyDockWidgetMenu->removeAction(action);
    action->deleteLater();

    if (destroyDockWidgetMenu->isEmpty())
        destroyDockWidgetMenu->setEnabled(false);
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.