Properties of group windows in .NET

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11.9.2 Properties of group windows
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Properties of group windows include: Name Identi er Screen device. The identi er is a number from 1 to 10,000 inclusive that WSERV assigns to each group window. The numbers are unique across all group windows in existence at any one time; they are also allocated cyclically so that when a group window is destroyed, it is unlikely that its identi er will be used again immediately. Identi ers give applications a way of discovering all of the group windows in the system at any time. The APIs in RWsSession use identi ers as a means of referring to group windows:
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TInt TInt TInt TInt TInt TInt SetWindowGroupOrdinalPosition(TInt aIdentifier, TInt aPosition); GetWindowGroupClientThreadId(TInt aIdentifier, TThreadId &aThreadId); GetWindowGroupHandle(TInt aIdentifier); GetWindowGroupOrdinalPriority(TInt aIdentifier); SendEventToWindowGroup(TInt aIdentifier, const TWsEvent &aEvent); FindWindowGroupIdentifier(TInt aPreviousIdentifier, const TDesC& aMatch, TInt aOffset=0); TInt FindWindowGroupIdentifier(TInt aPreviousIdentifier, TThreadId aThreadId); TInt SendMessageToWindowGroup(TInt aIdentifier,TUid aUid, const TDesC8 &aParams);
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THE WINDOW SERVER
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These functions allow group windows to be listed, interrogated and re-ordered. There are two API functions for setting and getting a group window s name in the RWindowGroup class. In addition, there is one API function in the RWsSession class:
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TInt GetWindowGroupNameFromIdentifier(TInt aIdentifier, TDes &aWindowName);
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Group window names are used so that the system can get a list of running applications. It is normal for a WSERV client to create a screen device, CWsScreenDevice, which has an associated object of class DWsScreenDevice created in the server. The rst screen device created by a client becomes the primary screen device for that client. This screen device will be assigned to each group window that that client creates. Group windows created before the primary screen device are never associated with a screen device. The association of group windows with screen devices is used in systems with more than one screen size mode. (In future, it will also be used in systems with more than one screen.) In this case, each screen device has a screen size mode associated with it. If the current system screen size mode differs from the screen device s screen size mode, then WSERV will make all of the group windows and their children invisible.
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11.9.3 Properties of client windows
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Client windows have two screen modes and many different areas or regions.
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11.9.3.1 Screen modes
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The two screen modes (or color depths) are both associated with the screen mode that the client requests. One of these is the drawing mode, which speci es which set of colors can be drawn to the window. The other mode is the hardware mode, which is the minimum mode that the hardware needs to be switched into so that this window can be displayed correctly. A window can request its own drawing mode, but by default WSERV will give it the mode that is speci ed in the WSINI.INI le using the keyword WINDOWMODE. WSERV calculates the actual drawing mode that a window will get using the requested mode and the modes available on the hardware. In Symbian OS, color modes are speci ed using the enum TDisplayMode. These have a naming convention, depending on whether they are gray scale or color, and the number of colors they contain. So, for example, EColor64K is a mode with 65536
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PROPERTIES OF WINDOWS
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Request mode EGray16 EColor256 EColor64K EColor16M
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Drawing mode EGray16 EColor256 EColor64K EColor64K
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Hardware mode EColor4K EColor4K EColor64K EColor64K
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non-gray colors. Here are some examples of how the modes get assigned to windows for hardware that supports EColor4K and EColor64K: The drawing mode is changed to the one requested, unless it requires more colors than the hardware supports.
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11.9.3.2 Regions
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Windows have many different regions associated with them. I will now discuss some of these. In Symbian OS, we provide a base class, TRegion, which has several derived classes. These classes store a list of disjoint rectangles and can be used to describe a two-dimensional area. There are many manipulation functions for these classes, including functions to add and intersect regions. WSERV makes extensive use of these classes this is why we recommend that you machine code these classes when porting Symbian OS to new hardware. Calculating the regions is a time-consuming business. Because of this, WSERV caches the regions after it has rst calculated it. Then the next time it needs it, it uses the cached value. This of course means that when an operation takes place that might have changed one of the cached regions, WSERV must discard them all.
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Base area This is the area that the client speci es using the function RWindowBase::SetShape(). However, the more rectangles that there are in the region describing the area, the greater the processing required when these windows are visible. Thus circular or triangular windows will be particularly inef cient. By default, windows are rectangular and the same size as their parent. This means that they are full screen if their parent is a group window. Their size can be changed by using the SetSize() function (de ned in RWindow or RBlankWindow) or by the SetSizeErr() function (de ned in RWindowBase).
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