C++ QDesignerWidgetDataBaseItemInterface类代码示例

void WidgetDataBase::grabDefaultPropertyValues()
{
    const int itemCount = count();
    for (int i = 0; i < itemCount; ++i) {
        QDesignerWidgetDataBaseItemInterface *dbItem = item(i);
        const QList<QVariant> default_prop_values = defaultPropertyValues(dbItem->name());
        dbItem->setDefaultPropertyValues(default_prop_values);
    }
}

void QSimpleResource::addCustomWidgetsToWidgetDatabase(const QDesignerFormEditorInterface *core,
                                                       QList<DomCustomWidget*>& custom_widget_list)
{
    QDesignerWidgetDataBaseInterface *db = core->widgetDataBase();
    for (int i=0; i < custom_widget_list.size(); ) {
        bool classInserted = false;
        DomCustomWidget *custom_widget = custom_widget_list[i];
        const QString customClassName = custom_widget->elementClass();
        const QString base_class = custom_widget->elementExtends();
        QString includeFile;
        IncludeType includeType = IncludeLocal;
        if (const DomHeader *header = custom_widget->elementHeader()) {
            includeFile = header->text();
            if (header->hasAttributeLocation() && header->attributeLocation() == QStringLiteral("global"))
                includeType = IncludeGlobal;
        }
        const bool domIsContainer = custom_widget->elementContainer();
        // Append a new item
        if (base_class.isEmpty()) {
            WidgetDataBaseItem *item = new WidgetDataBaseItem(customClassName);
            item->setPromoted(false);
            item->setGroup(QCoreApplication::translate("Designer", "Custom Widgets"));
            item->setIncludeFile(buildIncludeFile(includeFile, includeType));
            item->setContainer(domIsContainer);
            item->setCustom(true);
            addFakeMethodsToWidgetDataBase(custom_widget, item);
            db->append(item);
            custom_widget_list.removeAt(i);
            classInserted = true;
        } else {
            // Create a new entry cloned from base class. Note that this will ignore existing
            // classes, eg, plugin custom widgets.
            QDesignerWidgetDataBaseItemInterface *item =
                appendDerived(db, customClassName, QCoreApplication::translate("Designer", "Promoted Widgets"),
                              base_class,
                              buildIncludeFile(includeFile, includeType),
                              true,true);
            // Ok, base class found.
            if (item) {
                // Hack to accommodate for old UI-files in which "container" is not set properly:
                // Apply "container" from DOM only if true (else, eg classes from QFrame might not accept
                // dropping child widgets on them as container=false). This also allows for
                // QWidget-derived stacked pages.
                if (domIsContainer)
                    item->setContainer(domIsContainer);

                addFakeMethodsToWidgetDataBase(custom_widget, static_cast<WidgetDataBaseItem*>(item));
                custom_widget_list.removeAt(i);
                classInserted = true;
            }
        }
        // Skip failed item.
        if (!classInserted)
            i++;
    }

}

    void QDesignerPromotionDialog::slotRemove() {
        unsigned flags;
        QDesignerWidgetDataBaseItemInterface *dbItem = databaseItemAt(m_treeView->selectionModel()->selection(), flags);
        if (!dbItem || (flags & Referenced))
            return;

        QString errorMessage;
        if (m_promotion->removePromotedClass(dbItem->name(), &errorMessage)) {
            slotUpdateFromWidgetDatabase();
        } else {
            displayError(errorMessage);
        }
    }

QDESIGNER_SHARED_EXPORT WidgetDataBaseItemList
        promotionCandidates(const QDesignerWidgetDataBaseInterface *db,
                            const QString &baseClassName)
{
    WidgetDataBaseItemList rc;
    // find existing promoted widgets deriving from base.
    const int count = db->count();
    for (int i = 0; i < count; ++i) {
        QDesignerWidgetDataBaseItemInterface *item = db->item(i);
        if (item->isPromoted() && item->extends() == baseClassName) {
            rc.push_back(item);
        }
    }
    return rc;
}

    QDesignerWidgetDataBaseItemInterface *QDesignerPromotionDialog::databaseItemAt(const QItemSelection &selected, unsigned &flags) const {
        flags = 0;
        const QModelIndexList indexes = selected.indexes();
        if (indexes.empty())
            return 0;

        bool referenced;
        QDesignerWidgetDataBaseItemInterface *dbItem = m_model->databaseItemAt(indexes.front(), &referenced);

        if (dbItem) {
            if (referenced)
                flags |= Referenced;
            // In choose mode, can we promote to the class?
            if (m_mode == ModeEditChooseClass &&  dbItem && dbItem->isPromoted() && dbItem->extends() ==  m_promotableWidgetClassName)
                flags |= CanPromote;

        }
        return dbItem;
    }

void WidgetDataBase::grabStandardWidgetBoxIcons()
{
    // At this point, grab the default icons for the non-custom widgets from
    // the widget box. They will show up in the object inspector.
    if (const QDesignerWidgetBox *wb = qobject_cast<const QDesignerWidgetBox *>(m_core->widgetBox())) {
        const QString qWidgetClass = QLatin1String("QWidget");
        const int itemCount = count();
        for (int i = 0; i < itemCount; ++i) {
            QDesignerWidgetDataBaseItemInterface *dbItem = item(i);
            if (!dbItem->isCustom() && dbItem->icon().isNull()) {
                // Careful not to catch the layout icons when looking for
                // QWidget
                const QString name = dbItem->name();
                if (name == qWidgetClass) {
                    dbItem->setIcon(wb->iconForWidget(name, QLatin1String("Containers")));
                } else {
                    dbItem->setIcon(wb->iconForWidget(name));
                }
            }
        }
    }
}

QDESIGNER_SHARED_EXPORT QDesignerWidgetDataBaseItemInterface *
        appendDerived(QDesignerWidgetDataBaseInterface *db,
                      const QString &className, const QString &group,
                      const QString &baseClassName,
                      const QString &includeFile,
                      bool promoted, bool custom)
{
    if (debugWidgetDataBase)
        qDebug() << "appendDerived " << className << " derived from " << baseClassName;
    // Check.
    if (className.isEmpty() || baseClassName.isEmpty()) {
        qWarning("** WARNING %s called with an empty class names: '%s' extends '%s'.",
                 Q_FUNC_INFO, className.toUtf8().constData(), baseClassName.toUtf8().constData());
        return 0;
    }
    // Check whether item already exists.
    QDesignerWidgetDataBaseItemInterface *derivedItem = 0;
    const int existingIndex = db->indexOfClassName(className);
    if ( existingIndex != -1)
        derivedItem =  db->item(existingIndex);
    if (derivedItem) {
        // Check the existing item for base class mismatch. This will likely
        // happen when loading a file written by an instance with missing plugins.
        // In that case, just warn and ignore the file properties.
        //
        // An empty base class indicates that it is not known (for example, for custom plugins).
        // In this case, the widget DB is later updated once the widget is created
        // by DOM (by querying the metaobject). Suppress the warning.
        const QString existingBaseClass = derivedItem->extends();
        if (existingBaseClass.isEmpty() || baseClassName ==  existingBaseClass)
            return derivedItem;

        // Warn about mismatches
        designerWarning(QCoreApplication::translate("WidgetDataBase",
          "The file contains a custom widget '%1' whose base class (%2)"
          " differs from the current entry in the widget database (%3)."
          " The widget database is left unchanged.").
                        arg(className, baseClassName, existingBaseClass));
        return derivedItem;
    }
    // Create this item, inheriting its base properties
    const int baseIndex = db->indexOfClassName(baseClassName);
    if (baseIndex == -1) {
        if (debugWidgetDataBase)
            qDebug() << "appendDerived failed due to missing base class";
        return 0;
    }
    const QDesignerWidgetDataBaseItemInterface *baseItem = db->item(baseIndex);
    derivedItem = WidgetDataBaseItem::clone(baseItem);
    // Sort of hack: If base class is QWidget, we most likely
    // do not want to inherit the container attribute.
    static const QString qWidgetName = QLatin1String("QWidget");
    if (baseItem->name() == qWidgetName)
        derivedItem->setContainer(false);
    // set new props
    derivedItem->setName(className);
    derivedItem->setGroup(group);
    derivedItem->setCustom(custom);
    derivedItem->setPromoted(promoted);
    derivedItem->setExtends(baseClassName);
    derivedItem->setIncludeFile(includeFile);
    db->append(derivedItem);
    return derivedItem;
}

void WidgetDataBase::loadPlugins()
{
    typedef QMap<QString, int> NameIndexMap;
    typedef QList<QDesignerWidgetDataBaseItemInterface*> ItemList;
    typedef QMap<QString, QDesignerWidgetDataBaseItemInterface*> NameItemMap;
    typedef QSet<QString> NameSet;
    // 1) create a map of existing custom classes
    NameIndexMap existingCustomClasses;
    NameSet nonCustomClasses;
    const int count = m_items.size();
    for (int i = 0; i < count; i++)    {
        const QDesignerWidgetDataBaseItemInterface* item =  m_items[i];
        if (item->isCustom() && !item->isPromoted())
            existingCustomClasses.insert(item->name(), i);
        else
            nonCustomClasses.insert(item->name());
    }
    // 2) create a list plugins
    ItemList pluginList;
    const QDesignerPluginManager *pm = m_core->pluginManager();
    foreach(QDesignerCustomWidgetInterface* c, pm->registeredCustomWidgets())
        pluginList += createCustomWidgetItem(c, pm->customWidgetData(c));

    // 3) replace custom classes or add new ones, remove them from existingCustomClasses,
    // leaving behind deleted items
    unsigned replacedPlugins = 0;
    unsigned addedPlugins = 0;
    unsigned removedPlugins = 0;
    if (!pluginList.empty()) {
        ItemList::const_iterator cend = pluginList.constEnd();
        for (ItemList::const_iterator it = pluginList.constBegin();it != cend; ++it )  {
            QDesignerWidgetDataBaseItemInterface* pluginItem = *it;
            const QString pluginName = pluginItem->name();
            NameIndexMap::iterator existingIt = existingCustomClasses.find(pluginName);
            if (existingIt == existingCustomClasses.end()) {
                // Add new class.
                if (nonCustomClasses.contains(pluginName)) {
                    designerWarning(tr("A custom widget plugin whose class name (%1) matches that of an existing class has been found.").arg(pluginName));
                } else {
                    append(pluginItem);
                    addedPlugins++;
                }
            } else {
                // replace existing info
                const int existingIndex = existingIt.value();
                delete m_items[existingIndex];
                m_items[existingIndex] = pluginItem;
                existingCustomClasses.erase(existingIt);
                replacedPlugins++;

            }
        }
    }
    // 4) remove classes that have not been matched. The stored indexes become invalid while deleting.
    if (!existingCustomClasses.empty()) {
        NameIndexMap::const_iterator cend = existingCustomClasses.constEnd();
        for (NameIndexMap::const_iterator it = existingCustomClasses.constBegin();it != cend; ++it )  {
            const int index = indexOfClassName(it.key());
            if (index != -1) {
                remove(index);
                removedPlugins++;
            }
        }
    }
    if (debugWidgetDataBase)
        qDebug() << "WidgetDataBase::loadPlugins(): " << addedPlugins << " added, " << replacedPlugins << " replaced, " << removedPlugins << "deleted.";
}