chapter 15 wpf windows presentation foundation dr. john abraham professor, utpa
TRANSCRIPT
CHAPTER 15 WPF
Windows Presentation Foundation
Dr. John Abraham
Professor, UTPA
Windows Presentation Foundation
• It is the framework for all graphics and multimedia.
• In the past different platforms had to be used to accomplish, video, sound, etc.
• With WPF, it can integrate other platforms into it.
• In the toolbox there is a section for WPF.
XAML (Extensible Application Markup Language)
• In WPF when GUI is added XAML markup statements are created to describe the GUI controls.
• Upon compilation the XAML compiler generates code to create and configure controls based on XAML markup.
• XAML is implemented with XML.
XML
• Standard for describing data
• Data thus described may be exchanged between different applications over the internet.
• XML describes information in such a way both humans and computers can understand.
XML - EXtensible Markup Language.
• XML was designed to describe data and to focus on what data is.– XML tags are not predefined. You must define
your own tags – XML uses a Document Type Definition (DTD) or an
XML Schema to describe the data
• HTML was designed to display data and to focus on how data looks
XML stores data, Does not display
• XML can Separate Data from HTML
• With XML, your data is stored outside your HTML.
• XML is Used to Exchange Data
• With XML, data can be exchanged between incompatible systems
• With XML, financial information can be exchanged over the Internet
An Example XML Document
<?xml version="1.0" encoding="ISO-8859-1"?> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend!</body> </note>
Displaying XML
http://www.w3schools.com/xml/xml_display.asp
Formatting and Manipulating XML documents
XML documents contain only data
May us XSL (Extensible Stylesheet Language) to specify rendering instructions for different platforms.
XSL (Extensible Stylesheet Language)
A group of three technologiesXSL-FO (Formatting Objects)
Vocabulary for specifying formatting
XPath
for effectively locating structures and data in XML documents
XSLT (XSL Transformation)For transforming XML documents into other
documents.
XSLT
SLT is a language for transforming XML documents into XHTML documents or to other XML documents.
http://www.w3schools.com/xsl/xsl_transformation.asp
Programming using XAML
GUI programming
XAML document defines the appearance of Windows Presentation Foundation application.
XAML program 1
<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="My Hello Program" Height="300" Width="300"> <Grid Background="Gold"> <Label HorizontalAlignment="Center"
VerticalAlignment="cENTER" FontSize="25"> WELCOME TO WPF </Label> </Grid></Window>
Explanation
• Application.xaml.vb is the code behind class and handles application-level events.
2 standard namespaces must be definedPresentation XAML namespace (Microsoft
presentation site)
Standard XAML namespace (Microsoft xaml site) – this site is assigned to x
WPF Controls
• Presented by elements in XAML markup.
• The root element is a window control (this is similar to the form control in our vb programs)
