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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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175 lines
9.6 KiB
Plaintext
175 lines
9.6 KiB
Plaintext
{{DISPLAYTITLE:_KEYDOWN}}
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The '''_KEYDOWN''' function returns whether modifying keys like CTRL, ALT, SHIFT, and any other keys are pressed.
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{{PageSyntax}}
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:: return% = '''_KEYDOWN('''''code&''''')'''
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* The ''return'' value is -1 if a specified key is pressed or 0 if it was not pressed. It can be used to monitor key combinations.
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* The POSITIVE [[LONG]] ''code'' value can be from any function key that needs to be monitored in a key press combination.
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* Unicode references:
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:* 1) What is the glyph represented by that UNICODE value: [http://www.fileformat.info/info/unicode/char/search.htm Unicode Format Info]
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:* 2) Which fonts support the characters I want to use: [http://en.wikipedia.org/wiki/Unicode_typefaces#Comparison_of_fonts Unicode Fonts]
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:* 3) What was the format again?: [http://www.birds-eye.net/definition/u/unicode.shtml Unicode Formats]
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:* A UTF32 value is usually(but by no means always!) the same as a UTF16 value just with the top 2 bytes set to 0.
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* An important difference between [[INKEY$]] and [[_KEYHIT]] is how they work when '''CTRL, ALT''' or '''SHIFT''' are used. [[INKEY$]] returns a different code if you hold down CTRL, ALT or SHIFT before pressing F1 (for example). [[_KEYHIT]] will return the same code regardless of which modifiers were used but you can check _KEYDOWN to see which modifying keys are being used.
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* '''Keyboards with Alt Gr key:''' [[_KEYHIT]] may return both Alt(100307) and Ctrl(100306) codes when key is pressed or released.
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* '''Linux with foreign keyboards:''' [[SHELL]] [[_HIDE]] "setxkbmap us" will setup a keyboard to read US [[Scancodes]].
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{{WhiteStart}} '''The QB64 Virtual Key constant values used: '''
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'''0-255''': [[ASCII|ASCII and Extended code]] values (Refer to [http://en.wikipedia.org/wiki/Code_page_437 CP437])
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'''256-65535''': [[ASCII#Two Byte Codes|ASCII 2-byte]] character codes (unaffected by SHIFT/ALT/CTRL modifiers)
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Use [[CVI]] to convert ASCII 2-byte codes to _KEYDOWN values.
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' '''_KEYDOWN Keyboard Values'''
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'
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''''Esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 Sys ScL Pause'''
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' 27 15104 15360 15616 15872 16128 16384 16640 16896 17152 17408 34048 34304 +316 +302 +019
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''''`~ 1! 2@ 3# 4$ 5% 6^ 7& 8* 9( 0) -_ =+ BkSp Ins Hme PUp NumL / * -'''
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'126 33 64 35 36 37 94 38 42 40 41 95 43 8 20992 18176 18688 +300 47 42 45
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''' 96 49 50 51 52 53 54 55 56 57 48 45 61''
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''''Tab Q W E R T Y U I O P [{ ]} \| Del End PDn 7Hme 8/▲ 9PU + '''
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' 9 81 87 69 82 84 89 85 73 79 80 123 125 124 21248 20224 20736 18176 18432 18688 43
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''' 113 119 101 114 116 121 117 105 111 112 91 93 92 55 56 57 ''
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''''CapL A S D F G H J K L ;: '" Enter 4/◄- 5 6/-►
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'+301 65 83 68 70 71 72 74 75 76 58 34 13 19200 19456 19712 '''E'''
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''' 97 115 100 102 103 104 106 107 108 59 39 52 53 54 '' '''n'''
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''''Shift Z X C V B N M ,< .> /? Shift ▲ 1End 2/▼ 3PD t'''
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'+304 90 88 67 86 66 78 77 60 62 63 +303 18432 20224 20480 20736 '''e'''
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''' 122 120 99 118 98 110 109 44 46 47 49 50 51 '' '''r'''
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''''Ctrl Win Alt Spacebar Alt Win Menu Ctrl ◄- ▼ -► 0Ins .Del '''
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'+306 +311 +308 32 +307 +312 +319 +305 19200 20480 19712 20992 21248 13
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' '' 48 46''
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'
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' ''' Lower value = LCase/NumLock On __________________ + = add 100000 '''
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{{WhiteEnd}}
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{{small|NOTE: The above commented table can be copied and pasted directly into the QB64 IDE}}
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{{WhiteStart}} '''65536-&H40000000: QB64-specific Virtual Key codes:'''
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CONST KEY_PAUSE& = 100019
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CONST KEY_NUMLOCK& = 100300
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CONST KEY_CAPSLOCK& = 100301
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CONST KEY_SCROLLOCK& = 100302
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CONST KEY_RSHIFT& = 100303
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CONST KEY_LSHIFT& = 100304
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CONST KEY_RCTRL& = 100305
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CONST KEY_LCTRL& = 100306
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CONST KEY_RALT& = 100307
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CONST KEY_LALT& = 100308
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CONST KEY_RMETA& = 100309 'Left 'Apple' key (MacOSX)
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CONST KEY_LMETA& = 100310 'Right 'Apple' key (MacOSX)
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CONST KEY_LSUPER& = 100311 'Left "Windows" key
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CONST KEY_RSUPER& = 100312 'Right "Windows"key
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CONST KEY_MODE& = 100313 '"AltGr" key
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CONST KEY_COMPOSE& = 100314
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CONST KEY_HELP& = 100315
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CONST KEY_PRINT& = 100316
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CONST KEY_SYSREQ& = 100317
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CONST KEY_BREAK& = 100318
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CONST KEY_MENU& = 100319
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CONST KEY_POWER& = 100320
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CONST KEY_EURO& = 100321
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CONST KEY_UNDO& = 100322
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CONST KEY_KP0& = 100256
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CONST KEY_KP1& = 100257
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CONST KEY_KP2& = 100258
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CONST KEY_KP3& = 100259
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CONST KEY_KP4& = 100260
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CONST KEY_KP5& = 100261
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CONST KEY_KP6& = 100262
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CONST KEY_KP7& = 100263
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CONST KEY_KP8& = 100264
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CONST KEY_KP9& = 100265
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CONST KEY_KP_PERIOD& = 100266
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CONST KEY_KP_DIVIDE& = 100267
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CONST KEY_KP_MULTIPLY& = 100268
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CONST KEY_KP_MINUS& = 100269
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CONST KEY_KP_PLUS& = 100270
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CONST KEY_KP_ENTER& = 100271
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CONST KEY_KP_INSERT& = 200000
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CONST KEY_KP_END& = 200001
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CONST KEY_KP_DOWN& = 200002
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CONST KEY_KP_PAGE_DOWN& = 200003
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CONST KEY_KP_LEFT& = 200004
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CONST KEY_KP_MIDDLE& = 200005
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CONST KEY_KP_RIGHT& = 200006
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CONST KEY_KP_HOME& = 200007
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CONST KEY_KP_UP& = 200008
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CONST KEY_KP_PAGE_UP& = 200009
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CONST KEY_KP_DELETE& = 200010
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CONST KEY_SCROLL_LOCK_MODE& = 200011
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CONST KEY_INSERT_MODE& = 200012
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'''&H40000000 up''': [[Unicode]] using the '''cyberbit.ttf''' font when available.
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'''Use [[_KEYHIT]] to find the key codes to be monitored by _KEYDOWN! '''
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{{WhiteEnd}}
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''Example 1:'' Comparing the _KEYDOWN returns using [[CONST|constant]] values with 2 byte [[INKEY$]] returns.
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{{CodeStart}} '' ''
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{{Cl|CONST}} RSHIFT& = 100303
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{{Cl|CONST}} LSHIFT& = 100304
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{{Cl|DO}}
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x = {{Cl|_KEYHIT}}
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{{Cl|IF}} x = {{Cl|CVI}}({{Cl|CHR$}}(0) + {{Cl|CHR$}}(59)) {{Cl|THEN}}
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{{Cl|IF}} {{Cl|_KEYDOWN}}(LSHIFT&) {{Cl|OR (boolean)|OR}} {{Cl|_KEYDOWN}}(RSHIFT&) {{Cl|THEN}}
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{{Cl|PRINT}} "KEYHIT: SHIFT + F1"
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{{Cl|ELSE}}
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{{Cl|PRINT}} "KEYHIT: F1"
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{{Cl|END IF}}
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{{Cl|END IF}}
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k$ = {{Cl|INKEY$}} 'compare key press return values
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{{Cl|IF}} k$ = {{Cl|CHR$}}(0) + {{Cl|CHR$}}(59) {{Cl|THEN}} {{Cl|PRINT}} "INKEY$: F1"
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{{Cl|IF}} k$ = {{Cl|CHR$}}(0) + {{Cl|CHR$}}(84) {{Cl|THEN}} {{Cl|PRINT}} "INKEY$: SHIFT+F1"
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{{Cl|LOOP}} {{Cl|UNTIL}} k$ = {{Cl|CHR$}}(27) 'escape key exit
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{{CodeEnd}}
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{{small|Code by Galleon}}
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''Example 2:'' How to calculate the _KEYDOWN codes of the 2 byte INKEY$ arrow key codes using [[CVI]].
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{{CodeStart}} '' ''
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{{Cl|SCREEN (statement)|SCREEN}} 12
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x = 320: y = 240
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col = {{Cl|_RGB}}(255, 0, 0)
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radius = 20
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DO
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{{Cl|CLS}}
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{{Cl|LOCATE}} 1, 1: {{Cl|PRINT}} "Use the arrow keys to move the circle."
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{{Cl|CIRCLE}} (x, y), radius, col
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{{Cl|PAINT}} (x, y), col
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{{Cl|IF...THEN|IF}} {{Cl|_KEYDOWN}}({{Cl|CVI}}({{Cl|CHR$}}(0) + "P")) {{Cl|THEN}} y = y + 1 '_KEYDOWN(20480)
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{{Cl|IF...THEN|IF}} {{Cl|_KEYDOWN}}({{Cl|CVI}}({{Cl|CHR$}}(0) + "H")) {{Cl|THEN}} y = y - 1 '_KEYDOWN(18432)
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{{Cl|IF...THEN|IF}} {{Cl|_KEYDOWN}}({{Cl|CVI}}({{Cl|CHR$}}(0) + "K")) {{Cl|THEN}} x = x - 1 '_KEYDOWN(19200)
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{{Cl|IF...THEN|IF}} {{Cl|_KEYDOWN}}({{Cl|CVI}}({{Cl|CHR$}}(0) + "M")) {{Cl|THEN}} x = x + 1 '_KEYDOWN(19712)
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{{Cl|_DISPLAY}}
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{{Cl|_LIMIT}} 100 'limit to 100 frames per second
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{{Cl|LOOP}} '' ''
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{{CodeEnd}}
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{{small|Code by Galleon}}
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:''Explanation:'' When [[CVI]] is used with a 2 byte code, the code of the first character(0) is added to the second character code which is multiplied by 256. In the example, code zero is added to the [[ASCII]] code of "P" which is 80. CVI multiplies 80 * 256 = 20480.
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''See also:
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* [[_KEYHIT]], [[Unicode]], [[Code Pages]] (by region)
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* [[_MAPUNICODE]], [[_MAPUNICODE (function)]]
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* [[INKEY$]], [[ASCII]], [[CVI]]
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* [[INP]](&H60), [[Scancodes]]
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* [[ON KEY(n)]], [[KEY(n)]], [[KEY n]]
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* [[Windows_Libraries#Hot_Keys_.28maximize.29|Windows hot keys]]
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{{PageNavigation}}
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<
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