1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
############################################################################
#
# File: select.icn
#
# Subject: Procedure to get selection from window
#
# Author: Ralph E. Griswold
#
# Date: August 30, 1996
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
#
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: grecords
#
############################################################################
link grecords
procedure select(win) #: interactive selection from window
local x0, x1, y0, y1, w, h, state, event
/win := &window
WAttrib(win, "drawop=reverse")
WAttrib(win, "linestyle=onoff")
state := "wait"
while event := Event(win) do {
if event == "q" then {
DrawRectangle(win, \x0, y0, 0, 0) # clear if already drawn
fail
}
case state of {
"wait": { # waiting for selection
case event of {
&lpress: {
x1 := x0 := &x # initial coordinates
y1 := y0 := &y
DrawRectangle(win, x0, y0, 0, 0) # start selection
state := "select" # now select the rectangle
}
}
}
"select": { # select the rectangle
case event of {
&ldrag: { # selecting ...
DrawRectangle(win, x0, y0, x1 - x0, y1 - y0) # erase
x1 := &x # new opposite corner
y1 := &y
DrawRectangle(win, x0, y0, x1 - x0, y1 - y0) # draw
}
&lrelease: { # got it!
DrawRectangle(win, x0, y0, x1 - x0, y1 - y0) # erase
x1 := &x # new opposite corner
y1 := &y
if (x0 = x1) | (y0 = y1) then # no area
state := "wait"
else {
w := x1 - x0 # set up for action
h := y1 - y0
DrawRectangle(win, x0, y0, w, h) # draw rectangle
state := "act" # now do something
}
}
}
}
"act": {
case event of {
"n": { # new selection
state := "wait"
DrawRectangle(win, x0, y0, w, h) # try again
}
"q": { # quit
DrawRectangle(win, x0, y0, w, h)
fail
}
"r": { # return selection
DrawRectangle(win, x0, y0, w, h) #
return rect(x0, y0, w, h)
}
}
}
}
}
end
|
