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This didn t end up as expected; instead, the text is clipped at the bottom. The pixel size of a font only defines the size above the base line on which all characters are drawn. rect.translate( 0, 30 ); QFont font = QApplication::font(); font.setPixelSize( rect.height() ); painter.setFont( font ); painter.drawText( rect, Qt::AlignRight, "Right." ); painter.drawText( rect, Qt::AlignLeft, "Left." ); painter.drawRect( rect ); To really be able to fit the text into a rectangle, use the QFontMetrics class to get accurate measures of the text. The font metrics class can be used to determine the width of a given text as well as its height. The height, however, is not dependent on any particular text; it s defined entirely by the font. The following code adjusts the height of the rectangle used to keep the text before drawing the text. Refer to Figure 7-13: the text fits beautifully this time around.

It can sometimes be difficult to work out the arguments that each validator will accept. The best way to find out is to look at the example usage for each type of validator on the FormEncode site. In addition to these arguments, validators also accept common arguments to configure their error messages and behavior. You ll learn about these next.

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recttranslate( 0, rectheight()+10 ); rectsetHeight( QFontMetrics( font )height() ); painterdrawText( rect, Qt::AlignRight, "Right" ); painterdrawText( rect, Qt::AlignLeft, "Left" ); painterdrawRect( rect ); Using drawText to paint text has its limitations For instance, parts of the text can t be formatted, nor can it be divided into paragraphs You can use the QTextDocument class to draw formatted text (as shown in the following source code) Drawing text with a text document is slightly more complicated than using drawText directly Start by creating a QTextDocument object that you initialize with HTML-formatted text using setHTML Set up the rectangle in which you ll draw the text Translate it to a new position below the last drawn text and then adjust the height to allow for more text The rectangle is then used to set the width of the text document using setTextWidth.

/* read key */ byte keyBytes [] = new byte [KEY_SIZE]; FileInputStream fis = new FileInputStream(keyFile); fisread(keyBytes); SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES"); /* initialize encrypter */ AESEncrypter aes = new AESEncrypter(keySpec); if (operationequals("encrypt")) { aesencrypt(Systemin, Systemout); } else if (operationequals("decrypt")) { aesdecrypt(Systemin, Systemout); } else { usage(); } } } The main() method first reads its two command-line arguments: the operation that the user would like to conduct, and the name of the key file In the case that the user did not supply enough command-line arguments, a usage message is printed to the standard error output stream Then, depending upon the operation requested, it takes an appropriate action.

Each of the validators will have a number of messages as well as a number of configuration options Here are some examples of the sorts of messages available; these are for the ConfirmType validator: badType: "The input must be a string (not a %(type)s: %(value)r)" empty: "Please enter a value" inSubclass: "%(object)r is not a subclass of one of the types %(subclassList)s" inType: "%(object)r must be one of the types %(typeList)s" noneType: "The input must be a string (not None)" subclass: "%(object)r is not a subclass of %(subclass)s" type: "%(object)r must be of the type %(type)s" To override the default value for an error message, you pass a msgs argument to the validator s constuctor For example: name = String(msgs={'empty':'Please enter a name'}) In each of these examples, constructs such as %(object)r and %(type)s are standard Python string-formatting terms.

Before you re ready to draw the text, you must translate the painter (more about this soon) because the text document will start painting its text at the (0,0) coordinate Before translating the painter, save the current state (it s later restored with a call to the restore method) Because you translated the painter, you must also translate the rectangle when you call drawContents to draw the text to the given painter inside the given rectangle QTextDocument doc; docsetHtml( "<p>A QTextDocument can be used to present formatted text " "in a nice way</p>" "<p align=center>It can be <b>formatted</b> " "<font size=+2>in</font> <i>different</i> ways</p>" "<p>The text can be really long and contain many " "paragraphs It is properly wrapped and such..</p>" ); recttranslate( 0, rectheight()+10 ); rectsetHeight( 160 ); docsetTextWidth( rectwidth() ); paintersave(); paintertranslate( recttopLeft() ); doc.

They are replaced by a string representation of the value to which they are referring Terms ending in s result in the object being converted to a string with str(), and terms ending in r result in the objects being converted to a string with the repr() function that displays a Python representation of the value You can use these same terms in your own custom messages if you like You don t need to specify messages for every error; FormEncode will use its defaults for any you don t specify Messages often take arguments, such as the number of characters, the invalid portion of the field, and so on These are always substituted as a dictionary (by name) So, you will use placeholders like %(key)s for each substitution This way you can reorder or even ignore placeholders in your new message.

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