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############################################################################
#
# vibslidr.icn -- procedures for defining slider and scrollbar objects
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
$include "vibdefn.icn"
$include "vdefns.icn"
##########################################################################
# slider_obj:
# v : vidget used for drawing
# proc : name of user callback procedure
# filter : filter out dragging events?
# id : unique identifier
# x,y,w,h : bounding box
# min : min value of range
# max : max value of range
# value : current value within range
# typ : "Slider" or "Scrollbar"
# focus : should focus lines be drawn around this object?
##########################################################################
record slider_obj(v, proc, filter, id, x, y, w, h, min, max, value, typ, focus)
##########################################################################
# create_slider() creates a slider instance and draws the slider.
##########################################################################
procedure create_slider(x, y, w, h, typ, min, max, value, filter)
local r, id, prefix
if typ == "Scrollbar" then
prefix := "sbar"
else
prefix := "slider"
id := next_id(prefix)
r := slider_obj(, prefix || "_cb" || id, filter, prefix || id,
x, y, w, h, min, max, value, typ, 0)
r.v := slider_vidget(id, typ, x, y, w, h)
VRemove(ROOT, r.v, 1)
return r
end
##########################################################################
# slider_vidget() creates the appropriate vidget for a slider or scrollbar.
##########################################################################
procedure slider_vidget(id, typ, x, y, w, h)
local dir
dir := if w > h then "h" else "v"
return case dir || typ of {
"vSlider": Vvert_slider(ROOT, x, y, APPWIN, , id, h, w, 1.0, 0.0)
"hSlider": Vhoriz_slider(ROOT, x, y, APPWIN, , id, w, h)
"vScrollbar": Vvert_scrollbar(ROOT, x, y, APPWIN, , id, h, w, 1.0, 0.0)
"hScrollbar": Vhoriz_scrollbar(ROOT, x, y, APPWIN, , id, w, h)
}
end
##########################################################################
# update_slider_bb() updates attributes in response to resizing.
##########################################################################
procedure update_slider_bb(object)
if object.w > object.h then {
object.w <:= VSlider_MinAspect * VSlider_MinWidth
object.h >:= object.w / VSlider_MinAspect
}
else {
object.h <:= VSlider_MinAspect * VSlider_MinWidth
object.w >:= object.h / VSlider_MinAspect
}
end
##########################################################################
# draw_slider() draws the given slider object.
##########################################################################
procedure draw_slider(r)
VSetState(r.v, abs((r.value - r.min) / (real(r.max - r.min))))
VDraw(r.v)
return r
end
##########################################################################
# load_slider() restores a slider object from session code.
##########################################################################
procedure load_slider(r, o)
local dir
r.filter := ("" ~== o.num)
r.typ := o.typ
o.lbl ? {
r.min := tab(upto(",")); move(1)
r.max := tab(upto(",")); move(1)
r.value := tab(0)
}
r.v := slider_vidget(r.id, r.typ, r.x, r.y, r.w, r.h)
VRemove(ROOT, r.v, 1)
end
##########################################################################
# save_slider() augments the record for saving a slider object.
##########################################################################
procedure save_slider(r, o)
r.typ := o.typ
r.lbl := o.min || "," || o.max || "," || o.value
r.sty := if r.w > r.h then "h" else "v"
r.num := o.filter
return
end
##########################################################################
# display_slider_atts() displays the attribute sheet with the current
# attributes for the given slider instance.
##########################################################################
procedure display_slider_atts(object)
local t, s
t := table()
t["_filter"] := object.filter
t["a_id"] := object.id
t["b_callback"] := object.proc
t["c_x"] := object.x
t["d_y"] := object.y - CANVASY
t["g_lefttop"] := object.min
t["h_initial"] := object.value
t["i_rightbot"] := object.max
if object.w > object.h then {
t["j_orientation"] := "horizontal"
t["e_length"] := object.w
t["f_width"] := object.h
}
else {
t["j_orientation"] := "vertical"
t["e_length"] := object.h
t["f_width"] := object.w
}
repeat {
s := slider_dialog(t)
if s == "Cancel" then
fail
if illegal(t["a_id"], "ID", "s") |
illegal(t["b_callback"], "Callback", "p") |
illegal(t["c_x"], "X", "i") |
illegal(t["d_y"], "Y", "i") |
illegal(t["f_width"], "Width", VSlider_MinWidth) |
illegal(t["e_length"], "Length", t["f_width"] * VSlider_MinAspect) |
illegal(t["g_lefttop"], "Left / Top", "n") |
illegal(t["h_initial"], "Initial", "n") |
illegal(t["i_rightbot"], "Right / Bottom", "n")
then
next
if not ((t["g_lefttop"] <= t["h_initial"] <= t["i_rightbot"]) |
(t["g_lefttop"] >= t["h_initial"] >= t["i_rightbot"])) then {
Notice("Initial value is not between the two extremes")
next
}
object.filter := t["_filter"]
object.id := t["a_id"]
object.proc := t["b_callback"]
object.min := t["g_lefttop"]
object.value := t["h_initial"]
object.max := t["i_rightbot"]
unfocus_object(object)
if t["j_orientation"] == "horizontal" then
move_object(object,
t["c_x"], t["d_y"] + CANVASY, t["e_length"], t["f_width"])
else
move_object(object,
t["c_x"], t["d_y"] + CANVASY, t["f_width"], t["e_length"])
focus_object(object)
break
}
end
#===<<vib:begin>>=== modify using vib; do not remove this marker line
procedure slider_dialog(win, deftbl)
static dstate
initial dstate := dsetup(win,
["slider_dialog:Sizer::1:0,0,389,276:",],
["_cancel:Button:regular::204,225,50,30:Cancel",],
["_filter:Button:checkno:1:270,132,69,20:filter",],
["_okay:Button:regular:-1:139,224,50,30:Okay",],
["a_id:Text::40:13,14,360,19:ID: \\=",],
["b_callback:Text::40:13,35,360,19:callback: \\=",],
["c_x:Text::3:13,62,101,19: x: \\=",],
["d_y:Text::3:13,83,101,19: y: \\=",],
["e_length:Text::3:13,109,101,19: length: \\=",],
["f_width:Text::3:13,130,101,19: width: \\=",],
["g_lefttop:Text::10:181,62,192,19: top / left: \\=",],
["h_initial:Text::10:181,83,192,19: initial: \\=",],
["i_rightbot:Text::10:181,104,192,19:bottom / right: \\=",],
["j_orientation:Choice::2:15,156,99,42:",,
["vertical","horizontal"]],
)
return dpopup(win, deftbl, dstate)
end
#===<<vib:end>>=== end of section maintained by vib
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