/
gui.go
152 lines (131 loc) · 3.59 KB
/
gui.go
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package terminal
import (
_ "embed"
"gioui.org/io/event"
"gioui.org/io/pointer"
"gioui.org/layout"
"gioui.org/op/clip"
"gioui.org/op/paint"
"gioui.org/unit"
"gioui.org/x/styledtext"
. "github.com/arjenjb/cu"
"image"
"image/color"
"strings"
)
func Console(th *Theme, screen *Screen, settings *ConsoleSettings) layout.Widget {
return func(gtx layout.Context) layout.Dimensions {
// Figure out character height
gtx = settings.update(th, screen, gtx)
return bordered(gtx, 1, color.NRGBA{
R: 0,
G: 0,
B: 0,
A: 128,
}, func(gtx layout.Context) layout.Dimensions {
evt, got := gtx.Source.Event(pointer.Filter{
Target: settings.scrollTag,
Kinds: pointer.Scroll,
ScrollBounds: image.Rectangle{
Min: image.Point{Y: -3},
Max: image.Point{Y: 3}},
})
if got {
switch evt := evt.(type) {
case pointer.Event:
screen.scrollTop = min(
max(
screen.scrollTop+int(evt.Scroll.Y),
0,
),
screen.top,
)
}
}
defer clip.Rect{Max: gtx.Constraints.Max}.Push(gtx.Ops).Pop()
paint.Fill(gtx.Ops, screen.defaults.BgColor)
// Declare the tag
event.Op(gtx.Ops, settings.scrollTag)
return layout.Stack{}.Layout(gtx,
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
return layout.Inset{
Top: settings.paddingY,
Right: settings.paddingX,
Bottom: settings.paddingY,
Left: settings.paddingX,
}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
t := styledtext.Text(th.Shaper, createSpansFrom(screen)...)
t.WrapPolicy = styledtext.WrapGraphemes
return t.Layout(gtx, nil)
})
}),
// Render the scrollbar
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
// scrollbar area
offset := gtx.Dp(8)
area := image.Rectangle{
Min: image.Point{gtx.Constraints.Max.X - int(float32(offset)*1.7), offset},
Max: image.Point{gtx.Constraints.Max.X - offset, gtx.Constraints.Max.Y - offset},
}
l := float32(screen.Size.Y) / float32(screen.top+screen.Size.Y)
if l < 1.0 {
total := float32(area.Dy())
height := total * l
offsetTop := (total - height) * float32(screen.scrollTop) / float32(screen.top)
bar := area
bar.Max.Y = area.Min.Y + int(height)
bar = bar.Add(image.Point{Y: int(offsetTop)})
defer clip.RRect{
Rect: bar,
SE: gtx.Dp(3),
SW: gtx.Dp(3),
NW: gtx.Dp(3),
NE: gtx.Dp(3),
}.Push(gtx.Ops).Pop()
paint.Fill(gtx.Ops, color.NRGBA{
R: 255,
G: 255,
B: 255,
A: 20,
})
}
return layout.Dimensions{
Size: image.Point{0, 0},
Baseline: 0,
}
}),
)
})
}
}
func bordered(gtx layout.Context, width unit.Dp, c color.NRGBA, f layout.Widget) layout.Dimensions {
defer clip.Rect{
Max: gtx.Constraints.Max,
}.Push(gtx.Ops).Pop()
paint.Fill(gtx.Ops, c)
return layout.UniformInset(width).Layout(gtx, f)
}
func createSpansFrom(screen *Screen) []styledtext.SpanStyle {
var spans []styledtext.SpanStyle
for _, line := range screen.VisibleLines() {
x := 0
for _, run := range line.runs {
if run.start > x {
spans = append(spans, styledtext.SpanStyle{Content: strings.Repeat(" ", run.start-x)})
}
f := screen.defaults.Font
if run.style.Bold {
f = screen.defaults.BoldFont
}
spans = append(spans, styledtext.SpanStyle{
Content: run.text,
Size: screen.defaults.FontSize,
Color: run.style.FgColor(),
Font: f,
})
x = run.end()
}
spans = append(spans, styledtext.SpanStyle{Content: "\n"})
}
return spans
}