Appendix D

© 1995, 1996, 1997 Gregg M. Townsend, Ralph E. Griswold, and Clinton L. Jeffery

Keyboard Symbols

Pressing a key on the keyboard produces an Icon event unless the key is a modifier key such as the shift key. Releasing a key does not produce an event.

A key that represents a member of the character set, including traditional actions such as return and backspace, produces a string containing a single character. The control and shift modifiers can affect the particular character produced: For example, pressing control-H produces "\b" (the backspace character).
defined symbol   value    key

Key_PrSc         65377    print screen
Key_ScrollLock   65300    scroll lock
Key_Pause        65299    pause

Key_Insert       65379    insert
Key_Home         65360    home
Key_PgUp         65365    page up
Key_End          65367    end
Key_PgDn         65366    page down

Key_Left         65361    arrow left
Key_Up           65362    arrow up
Key_Right        65363    arrow right
Key_Down         65364    arrow down

Key_F1           65470    function key F1
Key_F2           65471    function key F2
Key_F3           65472    function key F3
Key_F4           65473    function key F4
Key_F5           65474    function key F5
Key_F6           65475    function key F6
Key_F7           65476    function key F7
Key_F8           65477    function key F8
Key_F9           65478    function key F9
Key_F10          65479    function key F10
Key_F11          65480    function key F11
Key_F12          65481    function key F12
Other keys, such as function and arrow keys, produce integer-valued events. These values may be referenced symbolically by including the definitions contained in the library file keysyms.icn. The following table lists the values of some of the most commonly used keys.

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