mainwindow.cpp Example File

mainwindows/mainwindow/mainwindow.cpp
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#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 <QDialogButtonBox>
#include <QMessageBox>
#include <QSignalMapper>
#include <QApplication>
#include <QPainter>
#include <QMouseEvent>
#include <QLineEdit>
#include <QComboBox>
#include <QLabel>
#include <QPushButton>
#include <QTextEdit>
#include <QDebug>

static const char 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 CustomSizeHintMap &customSizeHints,
                       QWidget *parent, Qt::WindowFlags flags)
    : QMainWindow(parent, flags)
{
    setObjectName("MainWindow");
    setWindowTitle("Qt Main Window Example");

    QTextEdit *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"));

    menu->addAction(tr("Save layout..."), this, &MainWindow::saveLayout);
    menu->addAction(tr("Load layout..."), this, &MainWindow::loadLayout);
    menu->addAction(tr("Switch layout direction"),this, &MainWindow::switchLayoutDirection);

    menu->addSeparator();
    menu->addAction(tr("&Quit"), this, &QWidget::close);

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

    QAction *action = mainWindowMenu->addAction(tr("Animated docks"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & AnimatedDocks);
    connect(action, &QAction::toggled, this, &MainWindow::setDockOptions);

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

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

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

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

    action = mainWindowMenu->addAction(tr("Grouped dragging"));
    action->setCheckable(true);
    action->setChecked(dockOptions() & GroupedDragging);
    connect(action, &QAction::toggled, this, &MainWindow::setDockOptions);

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

#ifdef Q_OS_OSX
    toolBarMenu->addSeparator();

    action = toolBarMenu->addAction(tr("Unified"));
    action->setCheckable(true);
    action->setChecked(unifiedTitleAndToolBarOnMac());
    connect(action, &QAction::toggled, this, &QMainWindow::setUnifiedTitleAndToolBarOnMac);
#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;
    if (actions.at(5)->isChecked())
        opts |= GroupedDragging;

    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(QDir::toNativeSeparators(fileName), 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(QDir::toNativeSeparators(fileName), 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(QDir::toNativeSeparators(fileName), 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(QDir::toNativeSeparators(fileName));
        QMessageBox::warning(this, tr("Error"), msg);
        return;
    }
}

class DockWidgetAreaCornerFunctor {
public:
    explicit DockWidgetAreaCornerFunctor(QMainWindow *mw, Qt::Corner c, Qt::DockWidgetArea a)
        : m_mainWindow(mw), m_area(a), m_corner(c) {}

    void operator()() const { m_mainWindow->setCorner(m_corner, m_area); }

private:
    QMainWindow *m_mainWindow;
    Qt::DockWidgetArea m_area;
    Qt::Corner m_corner;
};

static QAction *addCornerAction(const QString &text, QMainWindow *mw, QMenu *menu, QActionGroup *group,
                                Qt::Corner c, Qt::DockWidgetArea a)
{
    QAction *result = menu->addAction(text, mw, DockWidgetAreaCornerFunctor(mw, c, a));
    result->setCheckable(true);
    group->addAction(result);
    return result;
}

void MainWindow::setupDockWidgets(const CustomSizeHintMap &customSizeHints)
{
    qRegisterMetaType<QDockWidget::DockWidgetFeatures>();

    QMenu *cornerMenu = dockWidgetMenu->addMenu(tr("Top left corner"));
    QActionGroup *group = new QActionGroup(this);
    group->setExclusive(true);
    QAction *cornerAction = addCornerAction(tr("Top dock area"), this, cornerMenu, group, Qt::TopLeftCorner, Qt::TopDockWidgetArea);
    cornerAction->setChecked(true);
    addCornerAction(tr("Left dock area"), this, cornerMenu, group, Qt::TopLeftCorner, Qt::LeftDockWidgetArea);

    cornerMenu = dockWidgetMenu->addMenu(tr("Top right corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    cornerAction = addCornerAction(tr("Top dock area"), this, cornerMenu, group, Qt::TopRightCorner, Qt::TopDockWidgetArea);
    cornerAction->setChecked(true);
    addCornerAction(tr("Right dock area"), this, cornerMenu, group, Qt::TopRightCorner, Qt::RightDockWidgetArea);

    cornerMenu = dockWidgetMenu->addMenu(tr("Bottom left corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    cornerAction = addCornerAction(tr("Bottom dock area"), this, cornerMenu, group, Qt::BottomLeftCorner, Qt::BottomDockWidgetArea);
    cornerAction->setChecked(true);
    addCornerAction(tr("Left dock area"), this, cornerMenu, group, Qt::BottomLeftCorner, Qt::LeftDockWidgetArea);

    cornerMenu = dockWidgetMenu->addMenu(tr("Bottom right corner"));
    group = new QActionGroup(this);
    group->setExclusive(true);
    cornerAction = addCornerAction(tr("Bottom dock area"), this, cornerMenu, group, Qt::BottomRightCorner, Qt::BottomDockWidgetArea);
    cornerAction->setChecked(true);
    addCornerAction(tr("Right dock area"), this, cornerMenu, group, Qt::BottomRightCorner, Qt::RightDockWidgetArea);

    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);

    const QIcon qtIcon(QPixmap(":/res/qt.png"));
    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(qtIcon);
        if (qstrcmp(sets[i].name, "Blue") == 0) {
            BlueTitleBar *titlebar = new BlueTitleBar(swatch);
            swatch->setTitleBarWidget(titlebar);
            connect(swatch, &QDockWidget::topLevelChanged, titlebar, &BlueTitleBar::updateMask);
            connect(swatch, &QDockWidget::featuresChanged, titlebar, &BlueTitleBar::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->colorSwatchMenu());
    }

    destroyDockWidgetMenu = new QMenu(tr("Destroy dock widget"), this);
    destroyDockWidgetMenu->setEnabled(false);
    connect(destroyDockWidgetMenu, &QMenu::triggered, this, &MainWindow::destroyDockWidget);

    dockWidgetMenu->addSeparator();
    dockWidgetMenu->addAction(tr("Add dock widget..."), this, &MainWindow::createDockWidget);
    dockWidgetMenu->addMenu(destroyDockWidgetMenu);
}

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

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

    QString enteredObjectName() const { return m_objectName->text(); }
    Qt::DockWidgetArea location() const;

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

CreateDockWidgetDialog::CreateDockWidgetDialog(QWidget *parent)
    : QDialog(parent)
    , m_objectName(new QLineEdit(this))
    , m_location(new QComboBox(this))
{
    setWindowTitle(tr("Add Dock Widget"));
    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
    QGridLayout *layout = new QGridLayout(this);

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

    layout->addWidget(new QLabel(tr("Location:")), 1, 0);
    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);

    QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
    connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
    connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::reject);
    layout->addWidget(buttonBox, 2, 0, 1, 2);
}

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);
    if (dialog.exec() == QDialog::Rejected)
        return;

    QDockWidget *dw = new QDockWidget;
    const QString name = dialog.enteredObjectName();
    dw->setObjectName(name);
    dw->setWindowTitle(name);
    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(name, 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.