qt5base-lts/demos/mainwindow/mainwindow.cpp

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** This file is part of the demonstration applications of the Qt Toolkit.
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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 <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 Demo</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_WS_MAC
    "<p>On Mac 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 Demo");

    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()
{
    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);

    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_WS_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);

#ifdef Q_WS_QWS
            QPalette pal = palette();
            pal.setBrush(backgroundRole(), QColor(0,0,0,0));
            swatch->setPalette(pal);
#endif
        }

        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);
}