qdesigner_promotiondialog.cpp

来自「奇趣公司比较新的qt/emd版本」· C++ 代码 · 共 422 行 · 第 1/2 页

        QVBoxLayout *vboxLayout = new QVBoxLayout(this);

        // tree view group
        QGroupBox *treeViewGroup = new QGroupBox();
        treeViewGroup->setTitle(tr("Promoted Classes"));
        QVBoxLayout *treeViewVBoxLayout = new QVBoxLayout(treeViewGroup);
        // tree view
        m_treeView->setModel (m_model);
        m_treeView->setMinimumWidth(450);

        connect(m_treeView->selectionModel(), SIGNAL(selectionChanged(QItemSelection, QItemSelection)),
                this, SLOT(slotSelectionChanged(QItemSelection, QItemSelection)));

        QHeaderView *headerView = m_treeView->header();
        headerView->setResizeMode(QHeaderView::ResizeToContents);
        treeViewVBoxLayout->addWidget(m_treeView);
        // remove button
        QHBoxLayout *hboxLayout = new QHBoxLayout();
        hboxLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Ignored));

        m_removeButton->setAutoDefault(false);
        connect(m_removeButton, SIGNAL(clicked()), this, SLOT(slotRemove()));
        m_removeButton->setEnabled(false);
        hboxLayout->addWidget(m_removeButton);
        treeViewVBoxLayout->addLayout(hboxLayout);
        vboxLayout->addWidget(treeViewGroup);
        // Create new panel: Try to be smart and preselect a base class. Default to QFrame
        const QStringList &baseClassNameList = baseClassNames(m_promotion);
        int preselectedBaseClass = -1;
        if (m_mode == ModeEditChooseClass) {
            preselectedBaseClass = baseClassNameList.indexOf(m_promotableWidgetClassName);
        }
        if (preselectedBaseClass == -1)
            preselectedBaseClass = baseClassNameList.indexOf(QLatin1String("QFrame"));

        NewPromotedClassPanel *newPromotedClassPanel = new NewPromotedClassPanel(baseClassNameList, preselectedBaseClass);
        connect(newPromotedClassPanel, SIGNAL(newPromotedClass(PromotionParameters, bool *)), this, SLOT(slotNewPromotedClass(PromotionParameters, bool *)));
        connect(this, SIGNAL(selectedBaseClassChanged(QString)),
                newPromotedClassPanel, SLOT(chooseBaseClass(QString)));
        vboxLayout->addWidget(newPromotedClassPanel);
        // button box
        vboxLayout->addWidget(m_buttonBox);
        // connect model
        connect(m_model, SIGNAL(includeFileChanged(QDesignerWidgetDataBaseItemInterface*, QString)),
                this, SLOT(slotIncludeFileChanged(QDesignerWidgetDataBaseItemInterface*, QString)));

        connect(m_model, SIGNAL(classNameChanged(QDesignerWidgetDataBaseItemInterface*, QString)),
                this, SLOT(slotClassNameChanged(QDesignerWidgetDataBaseItemInterface*, QString)));

        // focus
        if (m_mode == ModeEditChooseClass)
            newPromotedClassPanel->grabFocus();

        slotUpdateFromWidgetDatabase();
    }

    QDialogButtonBox *QDesignerPromotionDialog::createButtonBox() {
        QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok|QDialogButtonBox::Close);

        connect(buttonBox , SIGNAL(accepted()), this, SLOT(slotAcceptPromoteTo()));
        buttonBox->button(QDialogButtonBox::Ok)->setText(tr("Promote"));
        buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);

        connect(buttonBox , SIGNAL(rejected()), this, SLOT(reject()));
        return buttonBox;
    }

    void QDesignerPromotionDialog::slotUpdateFromWidgetDatabase() {
        m_model->updateFromWidgetDatabase();
        m_treeView->expandAll();
        m_removeButton->setEnabled(false);
    }

    void QDesignerPromotionDialog::delayedUpdateFromWidgetDatabase() {
        QTimer::singleShot(0, this, SLOT(slotUpdateFromWidgetDatabase()));
    }

    const QStringList &QDesignerPromotionDialog::baseClassNames(const QDesignerPromotionInterface *promotion) {
        typedef QList<QDesignerWidgetDataBaseItemInterface *> WidgetDataBaseItemList;
        static QStringList rc;
        if (rc.empty()) {
            // Convert the item list into a string list.
            const WidgetDataBaseItemList dbItems =  promotion->promotionBaseClasses();
            const WidgetDataBaseItemList::const_iterator cend =  dbItems.constEnd();
            for (WidgetDataBaseItemList::const_iterator it = dbItems.constBegin() ; it != cend; ++it) {
                rc.push_back( (*it)->name());
            }
        }
        return rc;
    }

    void  QDesignerPromotionDialog::slotAcceptPromoteTo() {
        Q_ASSERT(m_mode == ModeEditChooseClass);
        unsigned flags;
        // Ok pressed: Promote to selected class
        if (QDesignerWidgetDataBaseItemInterface *dbItem = databaseItemAt(m_treeView->selectionModel()->selection(), flags)) {
            if (flags & CanPromote) {
                *m_promoteTo = dbItem ->name();
                accept();
            }
        }
    }

    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);
        }
    }

    void QDesignerPromotionDialog::slotSelectionChanged(const QItemSelection &selected, const QItemSelection &) {
        // Enable deleting non-referenced items
        unsigned flags;
        const QDesignerWidgetDataBaseItemInterface *dbItem = databaseItemAt(selected, flags);
        m_removeButton->setEnabled(dbItem && !(flags & Referenced));
        // In choose mode, can we promote to the class?
        if (m_mode == ModeEditChooseClass) {
            const bool enablePromoted = flags & CanPromote;
            m_buttonBox->button(QDialogButtonBox::Ok)->setEnabled(enablePromoted);
            m_buttonBox->button(QDialogButtonBox::Ok)->setDefault(enablePromoted);
        }
        // different base?
        if (dbItem) {
            const QString baseClass = dbItem->extends();
            if (baseClass !=  m_lastSelectedBaseClass) {
                m_lastSelectedBaseClass = baseClass;
                emit selectedBaseClassChanged(m_lastSelectedBaseClass);
            }
        }
    }

    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 QDesignerPromotionDialog::slotNewPromotedClass(const PromotionParameters &p, bool *ok) {
        QString  errorMessage;
        *ok = m_promotion->addPromotedClass(p.m_baseClass, p.m_className, p.m_includeFile, &errorMessage);
        if (*ok) {
            // update and select
            slotUpdateFromWidgetDatabase();
            const QModelIndex newClassIndex = m_model->indexOfClass(p.m_className);
            if (newClassIndex.isValid()) {
                m_treeView->selectionModel()->select(newClassIndex, QItemSelectionModel::SelectCurrent|QItemSelectionModel::Rows);
            }
        } else {
            displayError(errorMessage);
        }
    }

    void QDesignerPromotionDialog::slotIncludeFileChanged(QDesignerWidgetDataBaseItemInterface *dbItem, const QString &includeFile) {
        if (includeFile.isEmpty()) {
            delayedUpdateFromWidgetDatabase();
            return;
        }

        if (dbItem->includeFile() == includeFile)
            return;

        QString errorMessage;
        if (!m_promotion->setPromotedClassIncludeFile(dbItem->name(), includeFile, &errorMessage)) {
            displayError(errorMessage);
            delayedUpdateFromWidgetDatabase();
        }
    }

    void  QDesignerPromotionDialog::slotClassNameChanged(QDesignerWidgetDataBaseItemInterface *dbItem, const QString &newName) {
        if (newName.isEmpty()) {
            delayedUpdateFromWidgetDatabase();
            return;
        }
        const QString oldName = dbItem->name();
        if (newName == oldName)
            return;

        QString errorMessage;
        if (!m_promotion->changePromotedClassName(oldName , newName, &errorMessage)) {
            displayError(errorMessage);
            delayedUpdateFromWidgetDatabase();
        }
    }

    void QDesignerPromotionDialog::displayError(const QString &message) {
        QMessageBox::critical(this, tr("%1 - Error").arg(windowTitle()), message,  QMessageBox::Close);
    }
} // namespace qdesigner_internal