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QAction *cutAction; QAction *copyAction; QAction *pasteAction; QAction *aboutAction; QAction *aboutQtAction; }; Creating the actions and then adding them to the appropriate menu is done in exactly the same way as for the already existing actions. The fileOpen method, connected to the open action, is shown in Listing 8-21. It uses the static getOpenFileName method from the QFileDialog class to get a file name. If the user has closed the dialog without choosing a file, the resulting string s isNull method returns true. In that case, you return from the slot without opening a file.

SQLAlchemy 0.5 also has a Declarative API that offers a higher-level API to allow you to define on one go the same classes, tables, and mappers you added to your model.py file earlier in the chapter. For many applications, this is the only style of configuration needed. Let s rewrite the model.py file using the Declarative API:

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Many HTML tags can have (usually optional) attributes that specify or modify how a tag is interpreted by a browser. For example, in the HTML snippet <form method="POST" action="/do"> the <form> tag has two attributes, named method and action. The value of the attribute method is the string POST, and the value of the attribute action is the string /do. This and the following subsection cover several variations of contexts in which data is inserted into the values of attributes of HTML tags. In this section, we discuss concerns that apply to all attributes. The examples consider a form field that is prefilled with data. However, the considerations in this section apply to other attributes as well (such as style, color, href, etc).

If an actual file name is retrieved, you can try to load the file using loadFile. However, if the current document has not been given a file name and is unchanged, the file is loaded into the current document. If the current document has a file name or has been modified, a new SdiWindow instance is created and then the file is loaded into it. All SdiWindows are given file names when they are saved or loaded, so only new files do not have valid file names. Listing 8-21. Implementing the slot connected to the open action void SdiWindow::fileOpen() { QString filename = QFileDialog::getOpenFileName( this ); if( filename.isEmpty() ) return; if( currentFilename.isEmpty() && !docWidget->document()->isModified() ) loadFile( filename ); else { SdiWindow *window = new SdiWindow(); window->loadFile( filename ); window->show(); } } The loadFile(const QString&) method is used to load the contents from a given file into the document of the current window. The source code of the method is shown in Listing 8-22. The function attempts to open the file. If the file cannot be opened, a message box is shown for the user. If the file is opened, a QTextStream is created, and the entire file content is loaded by using readAll. The document is then assigned the new text with the setPlainText method. When the document has been updated, the currentFilename variable is updated, the modified flag is set to false, and the window s title is updated. Listing 8-22. Source code actually loading file contents into the document void SdiWindow::loadFile( const QString &filename ) { QFile file( filename ); if( !file.open( QIODevice::ReadOnly | QIODevice::Text ) ) { QMessageBox::warning( this, tr("SDI"), tr("Failed to open file.") ); return; } QTextStream stream( &file ); docWidget->setPlainText( stream.readAll() );

import datetime from sqlalchemy import schema, types, orm metadata = schema.MetaData() def now(): return datetime.datetime.now() from sqlalchemy.ext.declarative import declarative_base # Assign the same metadata object we created earlier. Base = declarative_base(metadata=metadata) # We still need the pagetag table because we don't want to explicitly define a # Pagetag class but still # need to specify the table in the relation between pages and tags. pagetag_table = schema.Table('pagetag', metadata, schema.Column('id', types.Integer, schema.Sequence('pagetag_seq_id', optional=True), primary_key=True), schema.Column('pageid', types.Integer, schema.ForeignKey('page.id')), schema.Column('tagid', types.Integer, schema.ForeignKey('tag.id')), ) class Page(Base): __tablename__ = 'page' id = schema.Column(types.Integer, schema.Sequence('page_seq_id', optional=True), primary_key=True) content = schema.Column(types.Text(), nullable=False) posted = schema.Column(types.DateTime(), default=now) title = schema.Column(types.Unicode(255), default=u'Untitled Page') heading = schema.Column(types.Unicode(255)) comments = orm.relation("Comment", backref="page") tags = orm.relation("Tag", secondary=pagetag_table) class Comment(Base): __tablename__ = 'comment' id = schema.Column(types.Integer, schema.Sequence('comment_seq_id', optional=True), primary_key=True) pageid = schema.Column(types.Integer, schema.ForeignKey('page.id'), nullable=False) content = schema.Column(types.Text(), default=u'') name = schema.Column(types.Unicode(255)) email = schema.Column(types.Unicode(255), nullable=False) created = schema.Column(types.TIMESTAMP(), default=now()) class Tag(Base): __tablename__ = 'tag' id = schema.Column(types.Integer, schema.Sequence('tag_seq_id', optional=True), primary_key=True) name = schema.Column(types.Unicode(20), nullable=False, unique=True) page_table = Page.__table__

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