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1122 Drawing in Controls In the desktop NET Framework, a program can draw onto any type of control (including onto forms) This feature is sometimes referred to as owner-draw support, a feature first seen in native-code programming for just a few of the Win32 API controls The implementers of the NET Framework for the desktop seem to think this feature is something that every control should support On the desktop, every control supports the ownerdraw feature In other words, you can get a Graphics object for every type of control11 and use that object to draw inside the client area of any control Owner-draw support is widely available because it allows programmers to inherit from existing control classes and change the behavior and appearance of those classes This support allows the creation of custom control classes from existing control classes Things are different in the NET Compact Framework, for reasons that are directly attributable to the NET Compact Framework design goals The NET Compact Framework itself was built to be as small as possible and also to allow NET Compact Framework programs to run with reasonable performance The result is a set of controls with the following qualities

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<WebMethod(), _ SoapHeader("mysteryHeaders", _ Direction:=SoapHeaderDirectionIn, _ Required:=False)> _ Public Function WhatHeaders() As String Dim msg As String Dim unknownHeader As SoapUnknownHeader For Each unknownHeader In mysteryHeaders msg = msg + "Header xml: " + _ unknownHeaderElementOuterXml + vbCrLf Next Return msg End Function End Class

The game API defines two Layer subclasses: Sprite and TiledLayer Unfortunately, class Layer cannot be directly subclassed by the developers, since this would compromise the ability to improve performance through the use of native code in the implementation of the Game API

When WhatHeaders is called, all incoming SOAP headers will be deserialized into SoapUnknownHeader objects and added to the mysteryHeaders array The code inside WhatHeaders loops through all headers in this array and gets each header s XML using SoapUnknownHeader s Element property which returns the header as an XML element WhatHeaders then returns the headers XML back to the client as a demonstration that it received the header Listing 7-7 shows an example proxy for invoking WhatHeaders with a couple of undefined headers

11 All desktop control classes that we tested support the CreateGraphics method However, a few desktop control classes do not support the overriding of the Paint event: the ComboBox, HScrollbar, ListBox, ListView, ProgressBar, StatusBar, TabControl, TextBox, Toolbar, TrackBar, TreeView, and VScrollBar classes

Subclasses of class Layer can be drawn at any time using the paint method The Layer will be drawn on the Graphics object according to the current state information maintained by the Layer object (that is, position, visibility, and so forth) The Layer object is drawn at its current position relative to the current origin of the Graphics object Erasing the Layer is always the responsibility of the code outside the Layer class [ Team LiB ]

Listing 7-7 An example proxy that invokes WhatHeaders with two different SOAP headers (VBWSClientCode\7\CustomClient\Web References\VBWSServer1\Referencevb)

112 Drawing on the Display Screen NET Compact Framework controls rely heavily on the built-in,

'The following two classes were not auto-gen'd they were manually created Public Class SessionInfo Inherits SoapHeader

[ Team LiB ]

Win32 API control classes NET Compact Framework controls do not support every Property, Method, and Event (aka PME ) inherited from the base Control12 class There are two types of drawing: Paint event drawing and CreateGraphics method drawing The clearest way to describe the difference is relative to events because of the unique role played by the Paint event and its associated Paint event handler method From this perspective, the two types of drawing are better stated as Paint event drawing and drawing for other events We turn our attention now to the subject of the Paint event and its role in the Windows CE user interface

Public SessionId As String Public LastUsed As DateTime End Class Public Class TransactionInfo Inherits SoapHeader Public TransactionId As String Public MyVote As Boolean End Class <SystemWebServicesWebServiceBindingAttribute(Name:="DataServiceSoap", [Namespace]:="http://tempuriorg/")> _ Public Class DataService Inherits SystemWebServicesProtocolsSoapHttpClientProtocol

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