119 lines
2.2 KiB
ReStructuredText
119 lines
2.2 KiB
ReStructuredText
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Input Processing
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================
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Input Server messages
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---------------------
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The Input Server collects information about keyboard and mouse events
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and forwards them to the app_server via messages. They are sent to port
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specifically for such messages, and the port is monitored by a thread
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whose task is to monitor, process, and dispatch them to the appropriate
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recipients. The Input Server is a regular BApplication, and unlike other
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applications, it requests a port to which it can send input messages.
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Mouse
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-----
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Mouse events consist of button changes, mouse movements, and the mouse
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wheel. The message will consist of the time of the event and attachments
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appropriate for each message listed below:
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B_MOUSE_DOWN
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............
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- when
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- buttons' status
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- location of the cursor
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- modifiers
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- clicks
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B_MOUSE_UP
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..........
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- time
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- buttons' status
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- location of the cursor
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- modifiers
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B_MOUSE_MOVED
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.............
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- time
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- location of the cursor
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- buttons' status
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B_MOUSE_WHEEL_CHANGED
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.....................
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- time
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- location of the cursor
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- transit - in or out
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- x delta
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- y delta
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Keyboard
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--------
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Keyboard events consist of notification when a key is pressed or
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released. Any keypress or release will evoke a message, regardless of
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whether or not the key is mapped. The message will consist of the
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appropriate code and attachments listed below:
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B_KEY_DOWN
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..........
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- time
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- key code
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- repeat count
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- modifiers
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- states
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- UTF-8 code
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- string generated
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- modifier-independent ASCII code
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B_KEY_UP
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........
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- time
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- key code
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- modifiers
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- states
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- UTF-8 code
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- string generated
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- modifier-independent ASCII code
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B_UNMAPPED_KEY_DOWN
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...................
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- time
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- key code
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- modifiers
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- states
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B_UNMAPPED_KEY_UP
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.................
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- time
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- key code
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- modifiers
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- states
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B_MODIFIERS_CHANGED
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...................
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sent when a modifier key changes
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- time
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- modifier states
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- previous modifier states
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- states
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Nearly all keypresses received by the app_server are passed onto the
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appropriate application. Control-Tab, when held, is sent to the Deskbar
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for app switching. Command+F?? is intercepted and a workspace is
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switched. Left Control + Alt + Delete is not even intercepted by the
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app_server. The Input Server receives it and shows the Team Monitor
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window.
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