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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
package gocui
import "testing"
func TestCalcScrollbar(t *testing.T) {
tests := []struct {
testName string
listSize int
pageSize int
position int
scrollAreaSize int
expectedStart int
expectedHeight int
}{
{
testName: "page size greater than list size",
listSize: 5,
pageSize: 10,
position: 0,
scrollAreaSize: 20,
expectedStart: 0,
expectedHeight: 20,
},
{
testName: "page size matches list size",
listSize: 10,
pageSize: 10,
position: 0,
scrollAreaSize: 20,
expectedStart: 0,
expectedHeight: 20,
},
{
testName: "page size half of list size",
listSize: 10,
pageSize: 5,
position: 0,
scrollAreaSize: 20,
expectedStart: 0,
expectedHeight: 10,
},
{
testName: "page size half of list size at scroll end",
listSize: 10,
pageSize: 5,
position: 5,
scrollAreaSize: 20,
expectedStart: 10,
expectedHeight: 10,
},
{
testName: "page size third of list size having scrolled half the way",
listSize: 15,
// Recall that my max position is listSize - pageSize i.e 15 - 5 i.e. 10.
// So if I've scrolled to position 5 that means I've done one page and I've got
// one page to go which means by scrollbar should take up a third of the available
// space and appear in the centre of the scrollbar area
pageSize: 5,
position: 5,
scrollAreaSize: 21,
expectedStart: 7,
expectedHeight: 7,
},
{
testName: "page size third of list size having scrolled the full way",
listSize: 15,
pageSize: 5,
position: 10,
scrollAreaSize: 21,
expectedStart: 14,
expectedHeight: 7,
},
{
testName: "page size third of list size having scrolled by one",
listSize: 15,
pageSize: 5,
position: 1,
scrollAreaSize: 21,
expectedStart: 2,
expectedHeight: 7,
},
{
testName: "page size third of list size having scrolled up from the bottom by one",
listSize: 15,
pageSize: 5,
position: 9,
scrollAreaSize: 21,
expectedStart: 12,
expectedHeight: 7,
},
}
for _, test := range tests {
t.Run(test.testName, func(t *testing.T) {
start, height := calcScrollbar(test.listSize, test.pageSize, test.position, test.scrollAreaSize)
if start != test.expectedStart {
t.Errorf("expected start to be %d, got %d", test.expectedStart, start)
}
if height != test.expectedHeight {
t.Errorf("expected height to be %d, got %d", test.expectedHeight, height)
}
})
}
}
|
