143 lines
3.5 KiB
NASM
143 lines
3.5 KiB
NASM
; FRMWRK.ASM
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; ----------
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; A set of common GUI code used in uFMOD examples for KolibriOS.
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; Feel free to reuse it in your own projects if you like it ;)
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; ---------------------------------------------------------------
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; void _cdecl _MessageBox (szCap, lpString, cbString);
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; void _cdecl _MessageBoxCB(szCap, lpString, cbString, cbProc);
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; ---------------------------------------------------------------
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; This is similar to a Win32 MessageBox. The box is centered
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; on screen. It contains a single-line text message and an
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; "OK" button. This function returns when user closes the
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; box (via the X button or via the OK button). An optional
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; callback subroutine may be specified to be called when no
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; events are pending in the event queue.
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; NOTE: Doesn't work if you already have defined a window
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; in the current process! Doesn't modify the event mask. So,
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; make sure keyboard events are enabled before calling this
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; function. This function doesn't check the validity of the
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; supplied parameters!
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; Parameters:
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; szCap - A pointer to the ASCIIz string containing the
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; caption. A trailing zero char IS required.
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; lpString - A pointer to an ASCII string containing a single
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; line message to pop up in the box. No trailing
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; zero char is required.
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; cbString - number of characters in string.
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; cbProc - Address of the callback subroutine. Can be NULL.
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sOK db "OK"
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if FRMWRK_CALLBACK_ON
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_MessageBoxCB:
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else
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_MessageBox:
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end if
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push ebp
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push esi
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push edi
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push ebx
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xor ebp,ebp ; global 0
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mov esi,[esp+28] ; cbString
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mov edi,[esp+20] ; szCap
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; Get screen metrics.
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lea eax,[ebp+14]
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int 40h
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mov ecx,eax
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movzx eax,ax
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shr ecx,16 ; screen w
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xchg eax,edx ; screen h
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lea ebx,[esi*2+esi]
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lea ebx,[ebx*2+28] ; w = string len * 6 + 28
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sub ecx,ebx
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shr ecx,1
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shl ecx,16
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or ebx,ecx
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lea ecx,[ebp+52h] ; h = 52h
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sub edx,ecx
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shr edx,1
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shl edx,16
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or ecx,edx ; y = (screen h - window h) / 2
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mov edx,ebx ; x = (screen w - window w) / 2
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_MessageBoxCB_redraw:
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; Start redraw.
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push edx
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lea eax,[ebp+12]
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lea ebx,[ebp+1]
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int 40h
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; Define and draw window.
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xor eax,eax
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mov ebx,edx ; x, w (ECX: y, h)
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mov edx,34C0C0C0h ; style and BG color
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int 40h
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; Define the OK button.
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push esi
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lea eax,[ebp+8]
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sub ebx,28+0Ah
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shr bx,1
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shl ebx,16 ; x = (window w - button w) / 2
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mov bx,18+0Ah ; w = 18 + 0Ah
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mov ecx,001C0012h ; y = 1Ch, h = 12h
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lea edx,[ebp+1] ; ID = close
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mov esi,0C0C0C0h ; color
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int 40h
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; Draw the OK label.
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lea eax,[ebp+4]
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add ebx,90000h ; x = button x + 9
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mov bx,22h ; y = 22h
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xor ecx,ecx ; style, font and color
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mov edx,sOK ; string
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lea esi,[ebp+2] ; length
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int 40h
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pop esi
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; Draw text string.
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lea eax,[ebp+4]
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mov ebx,000A000Ah ; x = 0Ah, y = 0Ah
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xor ecx,ecx ; style, font and color
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mov edx,[esp+28] ; lpString
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int 40h
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; End redraw.
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lea eax,[ebp+12]
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lea ebx,[ebp+2]
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int 40h
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if FRMWRK_CALLBACK_ON
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_MessageBoxCB_eventloop:
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mov edx,[esp+36] ; cbProc
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test edx,edx
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lea eax,[ebp+10]
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jz _MessageBoxCB_peekevent
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; Invoke the callback.
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call edx
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lea eax,[ebp+23]
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lea ebx,[ebp+10] ; wait for at most 0.1 sec
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_MessageBoxCB_peekevent:
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int 40h
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dec eax
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js _MessageBoxCB_eventloop
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else
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lea eax,[ebp+10]
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int 40h
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dec eax
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end if
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pop edx
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jz _MessageBoxCB_redraw
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pop ebx
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pop edi
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pop esi
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pop ebp
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ret
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