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kolibrios/programs/tinypad2/trunk/scroll.inc
Andrey Halyavin (halyavin) 065b8d32b2 programs sources added 
git-svn-id: svn://kolibrios.org@31 a494cfbc-eb01-0410-851d-a64ba20cac60
2006-01-03 09:43:31 +00:00

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;
;; Scroll.inc ;
;; ;
;; Vertical Scroll Bar Example for MenuetOS ;
;; ;
;; Version 0.2 27 February 2005 ;
;; ;
;; ;
;; GNU GENERAL PUBLIC LICENSE ;
;; Version 2, June 1991 ;
;; ;
;; Copyright 2005 Jason Delozier, ;
;; cordata51@hotmail.com ;
;; ;
;; See file COPYING for details ;
;; ;
;; Updates: ;
;; - FPU not longer used for calculations -Feb 27, 2005 ;
;; ;
;; ;
;; TODO: ;
;; - Create Message Handler and only allow runtime arguments ;
;; to be processed through the message handler ;
;; - Remove all local varibles and only allow working varible to ;
;; reside in scroll bar structure. ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;*****************************************************************************
;*
;* VScroll Structure Equates
;*
;*****************************************************************************
VScroll_width equ 0
VScroll_x equ 2
VScroll_height equ 4
VScroll_y equ 6
VScroll_min equ 8
VScroll_max equ 12
VScroll_current equ 16
VScroll_s_change equ 20
VScroll_b_change equ 24
;Example VScroll Structure
;VScroll_1:
; dw 16 ;width +0
; dw 100 ;x +2
; dw 200 ;height +4
; dw 40 ;y +6
; dd 0 ;min +8
; dd 1000;max +12
; dd 1 ;current +16
; dd 1 ;small change +20
; dd 10 ;big change +24
VScroll_Min_Height dw 16 ;scroll box
Vscroll_Fixed_Height dw 16 ;height of scroll buttons (up and down)
;**************************************
;*
;* Mouse Over VScroll
;*
;**************************************
vsm1 dd 0
vstoff dd 0
VScroll_mouse_over:
cmp [mouseb], 1
je VScroll_Mouse_Has_Mouse
cmp [mouseb], 0
jne VScroll_mouse_over_done2
mov [vsm1], 0
jmp VScroll_mouse_over_done2
VScroll_Mouse_Has_Mouse:
push ecx
mov ecx, [vsm1]
shl ecx,2
call dword [VScroll_Mouse_Jumptable+ecx]
VScroll_mouse_over_done:
pop ecx
VScroll_mouse_over_done2:
ret
VScroll_Mouse_Jumptable:
dd VScroll_Mouse_Find
dd VScroll_Mouse_On_Up
dd VScroll_Mouse_On_Down
dd VScroll_Mouse_Above_Thumb
dd VScroll_Mouse_Below_Thumb
dd VScroll_Mouse_On_Thumb
VScroll_Mouse_Find:
inc ecx
call dword [VScroll_Mouse_Jumptable+ecx*4]
cmp [vsm1], 0
jne VScroll_mouse_over_done2
cmp ecx, 5
je VScroll_mouse_over_done2
jmp VScroll_Mouse_Find
;**************************************
;Is Mouse at Up button
VScroll_Mouse_On_Up:
push eax
movzx eax, word [ebp+VScroll_y]
add ax, word [Vscroll_Fixed_Height]
cmp [mousey], ax
pop eax
ja VScroll_Mouse_On_Up2
mov [vsm1], 1
call VScroll_Small_Up
VScroll_Mouse_On_Up2:
ret
;**************************************
;Is Mouse at Down button
VScroll_Mouse_On_Down:
push eax
movzx eax,word [ebp+VScroll_y]
add ax, word [ebp+VScroll_height]
sub ax, word [Vscroll_Fixed_Height]
cmp [mousey], ax
pop eax
jb VScroll_Mouse_On_Down2
mov [vsm1], 2
call VScroll_Small_Down
VScroll_Mouse_On_Down2:
ret
;**************************************
;Is Mouse above Scroll Thumb
VScroll_Mouse_Above_Thumb:
push eax
push ecx
push edx
call Vscroll_SBox_Area
add cx, word [ebp+VScroll_y]
add cx, word [Vscroll_Fixed_Height] ;plus height of scroll button
cmp cx, [mousey]
pop edx
pop ecx
pop eax
jb VScroll_Mouse_Above_Thumb2
mov [vsm1], 3
call VScroll_Big_Up
VScroll_Mouse_Above_Thumb2:
ret
;**************************************
;Is Mouse below scroll thumb
VScroll_Mouse_Below_Thumb:
push eax
push ecx
push edx
call Vscroll_SBox_Area
add cx, word [ebp+VScroll_y]
add cx, word [Vscroll_Fixed_Height] ;plus height of scroll button
add cx, ax
cmp cx, [mousey]
pop edx
pop ecx
pop eax
ja VScroll_Mouse_Below_Thumb2
mov [vsm1], 4
call VScroll_Big_Down
VScroll_Mouse_Below_Thumb2:
ret
;**************************************
;Mouse is on Scroll Thumb
VScroll_Mouse_On_Thumb:
pusha
cmp [vsm1], 5 ;first time moving since we clicked?
je VScroll_Mouse_On_Thumb1 ;if not jump.. we already have offset
mov [vsm1], 5 ;determine offset between mouse pointer and top of thumb
call Vscroll_SBox_Area ;get top of thumb coordinate
add cx, word [ebp+VScroll_y] ;make screen coordinate
add cx, word [Vscroll_Fixed_Height] ;plus height of scroll button and top
movzx esi,word [mousey] ;get mouse position
sub esi, ecx ;make offset between top of thumb
mov [vstoff], esi ;and mouse pointer then save it
VScroll_Mouse_On_Thumb1: ;
movzx esi, [mousey] ;get mouse y value
sub si, word [ebp+VScroll_y] ;get y starting value of scroll bar
sub si, [Vscroll_Fixed_Height]
sub esi, [vstoff] ;
call Vscroll_SBox_Area ;
VScroll_Mouse_On_Thumb2: ;
cmp [ebp+VScroll_current], edx ;only redraw if change occured
je VScroll_Mouse_On_Thumb3 ;
mov [ebp+VScroll_current], edx ;new current value
call drawvscrolla ;redraw scroll background and thumb
VScroll_Mouse_On_Thumb3: ;
popa ;
ret
;**************************************
;*****************************************************************************
;*
;* Vscroll_SBox_Area
;*
;* Purpose: To determine the area of the Scroll Bar Thumb and the current
;* value of scroll based on top pixel of thumb.
;*
;* Inputs:
;* EBP - Structure of scroll bar
;* ESI - Top of Thumb - optional
;*
;* Outputs:
;* EAX - Thumb Height
;* ECX - Top of thumb
;* EDX - Current Value based on top pixel of thumb. Valid when ESI
;* is given as input.
;*
;* This procedure is divided up into 5 specific functions.
;* 1. ((Vmax-VMin)/Small Change)= Total Changes
;* 2. Height - (2* Fixed Button Height) = Total Pixels
;* 3. Total Pixels - Total Changes = Thumb Height (must be >= 16)
;* Minimum Height of 16 is varible [VScroll_Min_Height]
;* 4. (((Tot Pixels - Thumb Height)* Current)/Max-min)=Top Pixel of Thumb
;* 5. ((Mouse Top * (max-Min))/(Total Pix - Thumb Height)) = Current
;* Step 5 is only valid if ESI is supplied as an input.
;*
;*
;*****************************************************************************
Vscroll_SBox_Area:
push ebx
push esi
push edi
;Step 1. Determine Total Changes
mov eax, dword [ebp+VScroll_max] ;get max scroll
sub eax, dword [ebp+VScroll_min] ;sub minmum scroll for total scro
xor edx,edx
push eax
div dword [ebp+VScroll_s_change] ;
;eax = total changes ((max-min)/Small Change)
;Step 2. Determine Total Pixels
movzx ecx, word [ebp+VScroll_height] ;height of entire scroll bar
mov bx, word [Vscroll_Fixed_Height] ;minus height of both scroll button
shl bx, 1
sub cx, bx
push ecx
;ecx = total pixels (Total Height - (2*Fixed Button Height)
;Step 3. Determine Thumb Height
cmp ecx, eax
jbe vs1
sub ecx, eax
cmp cx, word [VScroll_Min_Height]
jb vs1
jmp vs2
vs1:
movzx ecx, word [VScroll_Min_Height]
vs2:
;ecx = Thumb Height (Total Pixels - Total Changes) >=16
;Step 4. Determine Top Pixel of Thumb
pop edi ;Total Pixels
sub edi, ecx ;
;edi = Total Pixels - thumb Height
mov eax, edi ;
mul dword [ebp+VScroll_current] ;get current scroll value
pop ebx ;max scroll
push ecx ;
div ebx ;
mov ecx, eax ;
;ecx = top pixel of thumb
;Step 5. Determine Current Value based on Mouse Position
cmp si,0
jge vss4
mov eax, dword [ebp+VScroll_min]
jmp vsdone1
vss4:
cmp esi, edi
jbe vss3
mov eax, dword [ebp+VScroll_max]
jmp vsdone1
vss3:
mov eax,ebx ;max scroll
mul esi ;Top Pixel of mouse
div edi ;Total Pixels - Thumb Height
;eax = Current Value
vsdone1:
mov edx, eax ;Current Value
pop eax ;Thumb Height
pop edi
pop esi
pop ebx
ret
;*****************************************************************************
;*
;*****************************************************************************
;ebp is structure
drawvscroll:
pusha
;up button
mov eax, 13 ;button system function
mov edx,0x00777777 ;0x6677cc ;color
mov ebx, [ebp+VScroll_width] ;x-start/width
mov cx, word [ebp+VScroll_y] ;get bottom of scroll bar
shl ecx, 16
mov cx, [Vscroll_Fixed_Height] ;fixed height
int 0x40
;down button
mov ebx, [ebp+VScroll_width] ;x-start/width
mov cx, word [ebp+VScroll_y] ;get bottom of scroll bar
add cx, word [ebp+VScroll_height] ;
sub cx, [Vscroll_Fixed_Height] ;y-start is 12 pixel from bottom
shl ecx, 16 ;
mov cx, [Vscroll_Fixed_Height] ;fixed height
int 0x40
;------- 'ASCL.INC' needs to be included to use this --
putlabel 493,46,'',cl_Black
putlabel 493,372,'',cl_Black
;------------------------------------------------------
popa
drawvscrolla:
pusha
mov eax, 13 ;Draw Scroll Box Background
mov edx, 0x00999999;0 ;color
push edx
movzx edx, word [Vscroll_Fixed_Height]
mov ebx, [ebp+VScroll_width] ;x-start/width
movzx ecx,word [ebp+VScroll_y] ;y-start
add ecx, edx ;add fixed height button
shl ecx, 16 ;do height next
mov cx,word [ebp+VScroll_height] ;y-start
sub cx, dx ;subtract fixed height of up button
sub cx, dx ;subtract fixed height of down button
pop edx
int 0x40 ;tell system to draw it
;determine height of scroll box (thumb)
call Vscroll_SBox_Area
add cx, [ebp+VScroll_y]
add cx, 16
shl ecx, 16
mov cx, ax
mov eax, 13 ;draw scroll box
mov ebx, [ebp+VScroll_width] ;x-start/width
mov edx, 0x00bbbbbb ;0x999999
int 0x40
;call Draw_Scroll_info
popa
ret
;*****************************************************************************
;*****************************************************************************
;* VScroll_Big_Up
;* VScroll_Small_Up
;*****************************************************************************
;need to update for signed values
VScroll_Big_Up:
push eax
push ebx
mov eax, dword [ebp+VScroll_b_change]
jmp VScroll_Up
VScroll_Small_Up:
push eax
push ebx
mov eax, dword [ebp+VScroll_s_change]
VScroll_Up:
mov ebx, dword [ebp+VScroll_min] ;get minimum value
cmp [ebp+VScroll_current], ebx ;are we at minimum already?
je VScroll_Up_exit ;if so leave
sub [ebp+VScroll_current], eax ;
jnc VScroll_Up_done
mov [ebp+VScroll_current], ebx
VScroll_Up_done:
cmp [ebp+VScroll_current], ebx ;if current is greater then max
jae VScroll_Up_done2
mov [ebp+VScroll_current], ebx
VScroll_Up_done2:
;redraw
call drawvscroll ;temp?
VScroll_Up_exit:
pop ebx
pop eax
ret
;*****************************************************************************
;*****************************************************************************
;* VScroll_Big_Down
;* VScroll_Small_Down
;*****************************************************************************
;need to update for signed values
VScroll_Big_Down:
push eax
push ebx
mov eax, dword [ebp+VScroll_b_change];get big change value
jmp VScroll_Down
VScroll_Small_Down:
push eax
push ebx
mov eax, dword [ebp+VScroll_s_change];get small change value
VScroll_Down:
mov ebx, dword [ebp+VScroll_max] ;get maximum scroll value
cmp [ebp+VScroll_current], ebx ;are we at max already?
je VScroll_Down_exit ;if so leave
add [ebp+VScroll_current], eax ;add change to current
jno VScroll_Down_done ;dont go beyond bounds of register
mov [ebp+VScroll_current], ebx ;if we did then we at max
VScroll_Down_done: ;
cmp [ebp+VScroll_current], ebx ;if current is greater then max
jbe VScroll_Down_done2 ;
mov [ebp+VScroll_current], ebx ;then we at max
VScroll_Down_done2: ;
;redraw
call drawvscroll ;temp?
VScroll_Down_exit:
pop ebx
pop eax
ret
;*****************************************************************************
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