abstractformbuilder.cpp

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#include "abstractformbuilder.h"
#include "formbuilderextra_p.h"
#include "ui4_p.h"
#include "properties_p.h"

#include <QtCore/QVariant>
#include <QtCore/QMetaProperty>
#include <QtCore/QFileInfo>
#include <QtCore/QDir>
#include <QtCore/QQueue>
#include <QtCore/QHash>
#include <QtCore/qdebug.h>

#include <QtGui/QAction>
#include <QtGui/QActionGroup>
#include <QtGui/QComboBox>
#include <QtGui/QFontComboBox>
#include <QtGui/QGridLayout>
#include <QtGui/QIcon>
#include <QtGui/QListWidget>
#include <QtGui/QMainWindow>
#include <QtGui/QPixmap>
#include <QtGui/QStatusBar>
#include <QtGui/QTreeWidget>
#include <QtGui/QTableWidget>
#include <QtGui/QWidget>
#include <QtGui/QSplitter>

#include <QtXml/QDomDocument>

#include <QtGui/QDialog>

// containers
#include <QtGui/QToolBox>
#include <QtGui/QStackedWidget>
#include <QtGui/QTabWidget>
#include <QtGui/QToolBar>
#include <QtGui/QMenuBar>
#include <QtGui/QDockWidget>

#include <QtCore/qdebug.h>

#include <limits.h>

Q_DECLARE_METATYPE(QWidgetList)

#ifdef QFORMINTERNAL_NAMESPACE
using namespace QFormInternal;
#endif

class QFriendlyLayout: public QLayout
{
public:
    inline QFriendlyLayout() { Q_ASSERT(0); }

#ifdef QFORMINTERNAL_NAMESPACE
    friend class QFormInternal::QAbstractFormBuilder;
#else
    friend class QAbstractFormBuilder;
#endif
};

/*!
    \class QAbstractFormBuilder

    \brief The QAbstractFormBuilder class provides a default
    implementation for classes that create user interfaces at
    run-time.

    \inmodule QtDesigner

    QAbstractFormBuilder provides a standard interface and a default
    implementation for constructing forms from user interface
    files. It is not intended to be instantiated directly. Use the
    QFormBuilder class to create user interfaces from \c{.ui} files at
    run-time. For example:

    \code
        MyForm::MyForm(QWidget *parent)
            : QWidget(parent)
        {
            QFormBuilder builder;
            QFile file(":/forms/myWidget.ui");
            file.open(QFile::ReadOnly);
            QWidget *myWidget = builder.load(&file, this);
            file.close();

            QVBoxLayout *layout = new QVBoxLayout;
            layout->addWidget(myWidget);
            setLayout(layout);
        }
    \endcode

    To override certain aspects of the form builder's behavior,
    subclass QAbstractFormBuilder and reimplement the relevant virtual
    functions:

    \list
    \o load() handles reading of \c{.ui} format files from arbitrary
       QIODevices, and construction of widgets from the XML data
       that they contain.
    \o save() handles saving of widget details in \c{.ui} format to
       arbitrary QIODevices.
    \o workingDirectory() and setWorkingDirectory() control the
       directory in which forms are held. The form builder looks for
       other resources on paths relative to this directory.
    \endlist

    The QFormBuilder class is typically used by custom components and
    applications that embed \QD. Standalone applications that need to
    dynamically generate user interfaces at run-time use the
    QUiLoader, found in the QtUiTools module.

    \sa {QtUiTools Module}
*/

/*!
    Constructs a new form builder.*/
QAbstractFormBuilder::QAbstractFormBuilder() :
    m_defaultMargin(INT_MIN),
    m_defaultSpacing(INT_MIN)
{
}

/*!
    Destroys the form builder.*/
QAbstractFormBuilder::~QAbstractFormBuilder()
{
    QFormBuilderExtra::removeInstance(this);
}


/*!
    \fn QWidget *QAbstractFormBuilder::load(QIODevice *device, QWidget *parent)

    Loads an XML representation of a widget from the given \a device,
    and constructs a new widget with the specified \a parent.

    \sa save()
*/
QWidget *QAbstractFormBuilder::load(QIODevice *dev, QWidget *parentWidget)
{
    QDomDocument doc;
    if (!doc.setContent(dev))
        return 0;

    QDomElement root = doc.firstChildElement();
    DomUI ui;
    ui.read(root); /// ### check the result

    return create(&ui, parentWidget);
}

/*!
    \internal
*/
QWidget *QAbstractFormBuilder::create(DomUI *ui, QWidget *parentWidget)
{
    QFormBuilderExtra *formBuilderPrivate = QFormBuilderExtra::instance(this);
    formBuilderPrivate->clear();
    if (const DomLayoutDefault *def = ui->elementLayoutDefault()) {
        m_defaultMargin = def->hasAttributeMargin() ? def->attributeMargin() : INT_MIN;
        m_defaultSpacing = def->hasAttributeSpacing() ? def->attributeSpacing() : INT_MIN;
    }

    DomWidget *ui_widget = ui->elementWidget();
    if (!ui_widget)
        return 0;

    DomCustomWidgets *domCustomWidgets  = ui->elementCustomWidgets();
    createCustomWidgets(domCustomWidgets);

#ifndef QT_FORMBUILDER_NO_SCRIPT    
    if (domCustomWidgets) {
        foreach(const DomCustomWidget* cw, domCustomWidgets->elementCustomWidget()) {
            if (const DomScript *domScript = cw->elementScript()) {
                const QString script = domScript->text();
                if (!script.isEmpty())
                    formBuilderPrivate->storeCustomWidgetScript(cw->elementClass(), script);            
            }
        }
    }
#endif

    if (QWidget *widget = create(ui_widget, parentWidget)) {
        createConnections(ui->elementConnections(), widget);
        createResources(ui->elementResources());
        applyTabStops(widget, ui->elementTabStops());
        formBuilderPrivate->applyInternalProperties();
        reset();
        formBuilderPrivate->clear();
        return widget;
    }
    formBuilderPrivate->clear();
    return 0;
}

/*!
    \internal
*/
QWidget *QAbstractFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidget)
{
    QWidget *w = createWidget(ui_widget->attributeClass(), parentWidget, ui_widget->attributeName());
    if (!w)
        return 0;

    applyProperties(w, ui_widget->elementProperty());

    foreach (DomAction *ui_action, ui_widget->elementAction()) {
        QAction *child_action = create(ui_action, w);
        Q_UNUSED( child_action );
    }

    foreach (DomActionGroup *ui_action_group, ui_widget->elementActionGroup()) {
        QActionGroup *child_action_group = create(ui_action_group, w);
        Q_UNUSED( child_action_group );
    }

    QWidgetList children;
    foreach (DomWidget *ui_child, ui_widget->elementWidget()) {
        if (QWidget *child  = create(ui_child, w)) {
            children += child;
        } else {
            const QString className = ui_child->elementClass().empty() ? QString() : ui_child->elementClass().front();
            uiLibWarning(QObject::tr("The creation of a widget of the class '%1' failed.").arg(className));
        }
    }

    foreach (DomLayout *ui_lay, ui_widget->elementLayout()) {
        QLayout *child_lay = create(ui_lay, 0, w);
        Q_UNUSED( child_lay );
    }

    foreach (DomActionRef *ui_action_ref, ui_widget->elementAddAction()) {
        const QString name = ui_action_ref->attributeName();
        if (name == QLatin1String("separator")) {
            QAction *sep = new QAction(w);
            sep->setSeparator(true);
            w->addAction(sep);
            addMenuAction(sep);
        } else if (QAction *a = m_actions.value(name)) {
            w->addAction(a);
        } else if (QActionGroup *g = m_actionGroups.value(name)) {
            w->addActions(g->actions());
        } else if (QMenu *menu = qFindChild<QMenu*>(w, name)) {
            w->addAction(menu->menuAction());
            addMenuAction(menu->menuAction());
        }
    }
    loadExtraInfo(ui_widget, w, parentWidget);
#ifndef QT_FORMBUILDER_NO_SCRIPT
    QString scriptErrorMessage;
    QFormBuilderExtra *extra = QFormBuilderExtra::instance(this);
    extra->formScriptRunner().run(ui_widget,
                                  extra->customWidgetScript(ui_widget->attributeClass()),
                                  w, children, &scriptErrorMessage);
#endif
    addItem(ui_widget, w, parentWidget);

    if (qobject_cast<QDialog *>(w) && parentWidget)
        w->setAttribute(Qt::WA_Moved, false); // So that QDialog::setVisible(true) will center it

    return w;
}

/*!
    \internal
*/
QAction *QAbstractFormBuilder::create(DomAction *ui_action, QObject *parent)
{
    QAction *a = createAction(parent, ui_action->attributeName());
    if (!a)
        return 0;

    applyProperties(a, ui_action->elementProperty());
    return a;
}

/*!
    \internal
*/
QActionGroup *QAbstractFormBuilder::create(DomActionGroup *ui_action_group, QObject *parent)
{
    QActionGroup *a = createActionGroup(parent, ui_action_group->attributeName());
    if (!a)
        return 0;

    applyProperties(a, ui_action_group->elementProperty());

    foreach (DomAction *ui_action, ui_action_group->elementAction()) {
        QAction *child_action = create(ui_action, a);
        Q_UNUSED( child_action );
    }

    foreach (DomActionGroup *g, ui_action_group->elementActionGroup()) {
        QActionGroup *child_action_group = create(g, parent);
        Q_UNUSED( child_action_group );
    }

    return a;
}

// figure out the toolbar area of a DOM attrib list.
// By legacy, it is stored as an integer. As of 4.3.0, it is the enumeration value.
Qt::ToolBarArea QAbstractFormBuilder::toolbarAreaFromDOMAttributes(const DomPropertyHash &attributes) {
    const DomProperty *attr = attributes.value(QLatin1String("toolBarArea"));
    if (!attr)
        return Qt::TopToolBarArea;
    switch(attr->kind()) {
    case DomProperty::Number:
        return static_cast<Qt::ToolBarArea>(attr->elementNumber());
    case DomProperty::Enum:
        return enumKeyOfObjectToValue<QAbstractFormBuilderGadget, Qt::ToolBarArea>("toolBarArea",  attr->elementEnum().toLatin1());
    default:
        break;
    }
    return Qt::TopToolBarArea;
}

/*!
    \internal
*/
bool QAbstractFormBuilder::addItem(DomWidget *ui_widget, QWidget *widget, QWidget *parentWidget)
{
    const DomPropertyHash attributes = propertyMap(ui_widget->elementAttribute());

    QString title = QLatin1String("Page");
    if (const DomProperty *ptitle = attributes.value(QLatin1String("title"))) {
        title = toString(ptitle->elementString());
    }

    QString label = QLatin1String("Page");
    if (const DomProperty *plabel = attributes.value(QLatin1String("label"))) {
        label = toString(plabel->elementString());
    }

    if (QMainWindow *mw = qobject_cast<QMainWindow*>(parentWidget)) {

        // the menubar
        if (QMenuBar *menuBar = qobject_cast<QMenuBar*>(widget)) {
            mw->setMenuBar(menuBar);
            return true;
        }

        // apply the toolbar's attributes
        else if (QToolBar *toolBar = qobject_cast<QToolBar*>(widget)) {
            mw->addToolBar(toolbarAreaFromDOMAttributes(attributes), toolBar);
            // check break
            if (const DomProperty *attr = attributes.value(QLatin1String("toolBarBreak")))
                if (attr->elementBool() == QLatin1String("true"))
                    mw->insertToolBarBreak (toolBar);

            return true;
        }

        // statusBar
        else if (QStatusBar *statusBar = qobject_cast<QStatusBar*>(widget)) {
            mw->setStatusBar(statusBar);
            return true;
        }

        // apply the dockwidget's attributes
        else if (QDockWidget *dockWidget = qobject_cast<QDockWidget*>(widget)) {
            if (const DomProperty *attr = attributes.value(QLatin1String("dockWidgetArea"))) {
                Qt::DockWidgetArea area = static_cast<Qt::DockWidgetArea>(attr->elementNumber());
                if (!dockWidget->isAreaAllowed(area)) {