empty_caret_test.go RawHistoryFolder

1package ui
2
3import (
4	"fmt"
5	"testing"
6
7	"github.com/bnema/nefergui/internal/css"
8	"github.com/bnema/nefergui/internal/text"
9)
10
11func TestEmptyLabelsDoNotReserveEditorLine(t *testing.T) {
12	catalog, err := text.Load(text.DirectorySource("../../testdata/fonts"))
13	if err != nil {
14		t.Fatal(err)
15	}
16	r := newRuntime()
17	r.setTextEngine(text.NewEngine(catalog))
18	r.Build(func(f *Frame) {
19		root := f.Root()
20		root.Text("")
21		root.Heading("")
22	})
23	if len(r.output.Tree.Children) != 2 {
24		t.Fatalf("empty labels: got %d children, want 2", len(r.output.Tree.Children))
25	}
26	for _, child := range r.output.Tree.Children {
27		if child.Content.H != 0 || len(child.Lines) != 0 {
28			t.Fatalf("empty label reserves line: %+v", child)
29		}
30	}
31}
32
33func TestEmptyTextareaCaretUsesLineHeight(t *testing.T) {
34	catalog, err := text.Load(text.DirectorySource("../../testdata/fonts"))
35	if err != nil {
36		t.Fatal(err)
37	}
38	for _, height := range []string{"normal", "1.5", "30px", "1.5em", "150%"} {
39		t.Run(height, func(t *testing.T) {
40			r := newRuntime()
41			r.setTextEngine(text.NewEngine(catalog))
42			r.styles = css.Compile(css.UA(), css.Parse(fmt.Sprintf(`textarea {height:400px;width:300px;font-size:20px;line-height:%s}`, height)))
43			value := ""
44			view := func(f *Frame) { f.Root().Textarea("Document", &value) }
45			r.Build(view)
46			r.route(key("Tab"))
47			r.Build(view)
48			caretHeight := func() float64 {
49				for _, cmd := range r.output.Display {
50					if cmd.Op == "caret" {
51						return cmd.Rect.H
52					}
53				}
54				t.Fatal("missing caret")
55				return 0
56			}
57			empty := caretHeight()
58			if empty <= 0 || empty >= 100 {
59				t.Fatalf("empty caret height=%g", empty)
60			}
61			value = "x"
62			r.Redraw()
63			r.Build(view)
64			if got := caretHeight(); got != empty {
65				t.Fatalf("empty=%g populated=%g", empty, got)
66			}
67		})
68	}
69}