THE WINDOW SERVER in VS .NET

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THE WINDOW SERVER
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so that WSERV does no further processing; to do this it should return ETrue from the OfferRawEvent function, otherwise it should return EFalse. From this point onward WSERV treats the different types of events in different ways. This is shown for all events other than key and pointer events, in the WSERV events table above.
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Processing key events
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There are three kernel events that are directly related to keys: EKeyDown, EKeyUp and EUpdateModifiers. To process these key events, WSERV uses an instance of a CKeyTranslator-derived object. This object understands character mappings and modi er keys, and its main purpose is to tell WSERV which characters a particular key press should map to. For example, pressing the a key could result in a or A , and it is CKeyTranslator that analyzes the state of the shift keys and determines which it should be. The event EUpdateModifiers is passed straight through to the CKeyTranslator object. The kernel generates this event in the emulator when the emulator window gains focus from another Windows applications. The data passed with the event tells us the current state of all the modi er keys, and enables the emulator to take into account any changes the user has made to modi er keys while other applications on the emulator host had focus.
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11.4.1 Key ups and downs
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WSERV processes each up and down event thus: It logs the event, if logging is enabled It tells the keyboard repeat timer object about the event It passes the event to the keyboard translator object It checks for any modi er changes It queues the key up/down event It performs further processing to create the character event (if there is to be one). The keyboard-repeat-timer object controls auto repeating of key presses. WSERV only receives a single up or down event from the kernel, no matter how long the key is pressed. If a key press maps to a character, WSERV starts a timer, and every time that timer goes off, WSERV generates another instance of the character for the client queue. If the client is responding
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PROCESSING KEY EVENTS
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promptly to the events, then it will get many events for that character, and the timer will have generated all but the rst of them. When a new key down event occurs, WSERV must inform the timer, so that it can cancel the current repeat this is needed because any key press should change the character the timer generates. Similarly, when a key up event occurs, WSERV informs the timer, so that it can stop the repeat if the key up comes from the currently repeating character. WSERV calls the keyboard translator object next, using the function:
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TBool TranslateKey(TUint aScanCode, TBool aKeyUp, const CCaptureKeys &aCaptureKeys, TKeyData &aKeyData)
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As you can see, WSERV passes the scan code of the key event, a Boolean to say whether the key is an up or down event, and the current list of capture keys. The key translator object returns a TBool saying whether the key maps to a character event or if it does, the key translator also returns the following details of the character event in the TKeyData object: The code of the character The current state of all the modi ers Whether the key has been captured. If the key is captured, the key translator also returns: A handle indicating which window captured the object Another handle which WSERV uses for its own capture keys. WSERV capture keys or hotkeys are system wide. There are hotkeys for increasing or decreasing contrast, toggling or turning the backlight on or off and more you can see the full list in the enum THotKey. Clients can request events to let them know when certain modi er keys change their state. When this happens, WSERV checks all client requests to see if any are requesting information about the particular change that has occurred. For each such request, WSERV queues an event to the relevant client. WSERV has to decide which client to send the up or down key event to. Usually it chooses the client that owns the currently focused window the only exception is if a particular client has requested the capture of up and down events on that particular key. WSERV also sends the event to the key click plug-in in case there is a sound associated with this event. WSERV now processes those key up or down events that the key translator object decided gave rise to character events. This processing is quite involved and I will describe it in the next section.
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