.NET/ASP.NET/C#/VB.NET PDF Document SDK

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.

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// The new constructor initializes the platform size appropriately public Turtle() { EnsurePlatformSize(); } // This method enforces the newly documented constraint // we added to the contract private void EnsurePlatformSize() { if (PlatformWidth < 1.0) { PlatformWidth = 1.0; } if (PlatformWidth > 10.0) { PlatformWidth = 10.0; } if (PlatformHeight < 1.0) { PlatformHeight = 1.0; } if (PlatformHeight > 10.0) { PlatformHeight = 10.0; } } // ...

}

Here we documented a constraint in our contract, and enforced that constraint first at construction, and then whenever clients attempt to modify the value. We chose to enforce that constraint at the point when the value can be changed because that makes the effect of the constraint directly visible. If users set an out-of-bounds value and read it back they can immediately see the effect of the constraint on the property. That s not the only choice, of course. We could have done it just before we used it but if we changed the implementation, or added features, we might have to add lots of calls to EnsurePlatformSize, and you can be certain that we d forget one somewhere. When we run the application again, we see the following output:

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() );

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 15.71 radians. (-1.53075794227797E-14,35) and is pointing at angle 15.71 radians. (-1.53075794227797E-14,35) and is pointing at angle 7.85 radians. (-3.53553390593275,35) and is pointing at angle 7.85 radians.

Although this is a very useful technique, and it has clearly banished those less-thanuseful NaNs, we have to consider: is this the right solution for this particular problem Let s think about our tennis-court-painting robot again. Would we really want it to

NET application, built with existing ASP NET skills and enhanced using Ajax/Atlas functionality When running the application, you should consider a number of issues Sometimes you will find that the browser renders this home page incorrectly when it is loaded for the first time If this appears to be happening to you, simply click the browser s Refresh button This should correct the page display This problem, if it occurs at all, generally is a problem only once: when you load the wiki for the first time in a browser The wiki uses SQL Server 2005 Express Edition by default The initial connection to the wiki s database sometimes times out in SQL Server You will see a message in the browser about this if it happens Simply click Refresh in the browser in this case.