Article ID: 37315
Article Last Modified on 1/8/2003
APPLIES TO
- Microsoft QuickBasic Compiler for Macintosh 1.0
This article was previously published under Q37315
SUMMARY
This article contains a sample program that creates and uses QuickBASIC scroll bars. Before attempting to write your own QuickBASIC program that uses scroll bars, we recommend that you research the following areas in the "Microsoft QuickBASIC for the Macintosh: BASIC Language Reference" manual:
Item Page(s)
---- -------
NewScroll 488
DisposeScroll 478
ScrollText 492
SetRect 495
FrameRect 402
SetPt 495
PtInRect 490
GetFontInfo 482
Mouse function 210-214
Scrolling is also discussed on Pages 432-434.
A program that defines scroll bars is provided further below. Two additional examples for defining scroll bars in QuickBASIC are "ToolBoxSampler" and "File Browser.source", which are located in the QB Demos folder on the Examples disk for QuickBASIC Version 1.00 for the Apple Macintosh.
MORE INFORMATION
Code Example
'PROGRAM: scroll
'DESCRIPTION:
' This programs puts up a scroll bar with an associated scrolling
' region. This region contains lines of text to be scrolled by
' clicking or dragging the scroll box around the scroll bar.
' Clicking on a particular line of text selects that line. And
' finally, a double-click ends the program.
'CONSTANTS:
' SingleClick Single click value
' DoubleClick Double-click value
' MaxLines Maximum number of text lines
'VARIABLES:
' linenum Currently selected line
' top Top line in scroll region
' s& Handle to a scroll bar
' PtInside Boolean flag that indicates
' inside/outside of scroll region
' s$() Array that holds text to be
' scrolled
' scr() Array that holds dimensions of
' scroll region (rectangle)
' bar() Array that holds dimensions of
' scroll bar (rectangle)
' FontInfo() Array that holds information
' about the current font
' AnyPt() Array that holds the (x,y)
' coordinates of the mouse pointer
' at the time of a single click,
' inside the scroll region
' FontHeight Vertical length of the current
' font
defint a-z
option base 1
SingleClick = -1: DoubleClick = -2: MaxLines = 10
linenum=1: top=0: s&=0: PtInside=0
dim s$(Maxlines), scr(4), bar(4), FontInfo(4), AnyPt(2)
SetRect scr(1), 3, 6, 114, 111
SetRect bar(1), 113, 6, 129, 111
FrameRect varptr (scr(1))
NewScroll s&, bar(1), 1, 1, 10, 1
GetFontInfo FontInfo(1)
FontHeight = FontInfo(1) + FontInfo(2) + FontInfo(4)
for n = 1 to MaxLines
read s$(n)
next n
while Mouse (0) <> DoubleClick
ScrollText s&, scr(1), s$(1), top, MaxLines, linenum
if Mouse (0) = SingleClick then
PtInside = 0
SetPt AnyPt(1), Mouse(1), Mouse(2)
PtInRect AnyPt(1), scr(1), PtInside
if PtInside then
linenum = (AnyPt(1) - scr(1)) \ (FontHeight + 4) + top
top = 0
end if
end if
wend
DisposeScroll s&
end
data one, two, three, four, five
data six, seven, eight, nine, ten
Additional query words: MQuickB
Keywords: KB37315
