53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
package text
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/egoist/mygo/ui"
|
|
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
|
|
)
|
|
|
|
type Align uint8
|
|
|
|
const (
|
|
Left Align = iota
|
|
Center
|
|
Right
|
|
)
|
|
|
|
type ParagraphOptions struct {
|
|
// Gap is extra dots between lines.
|
|
Gap int
|
|
Align Align
|
|
MaxLines int
|
|
Slot pixel.Slot
|
|
}
|
|
|
|
// Paragraph wraps s at the width it had last frame.
|
|
func Paragraph(c *ui.Context, s string, o ParagraphOptions) *ui.Element {
|
|
k := pixel.K(c)
|
|
gap := pixel.Or("Paragraph Gap", o.Gap, 0)
|
|
if o.Align > Right {
|
|
panic(fmt.Sprintf("text: unknown Align %d", o.Align))
|
|
}
|
|
e := ui.Box(c).FillWidth().Label(s).Role(ui.RoleText)
|
|
w, check := pixel.WrapWidth(c, e)
|
|
lines := pixel.Wrap(s, w, o.MaxLines)
|
|
step := pixel.LineHeight + gap
|
|
return e.Height(k.D(max(0, len(lines)*step-gap))).Draw(func(p *ui.Painter, r ui.Rect) {
|
|
check(r)
|
|
g := k.Canvas(p, r)
|
|
for i, l := range lines {
|
|
x := 0
|
|
switch o.Align {
|
|
case Center:
|
|
x = (g.W - pixel.Measure(l)) / 2
|
|
case Right:
|
|
x = g.W - pixel.Measure(l)
|
|
}
|
|
g.Text(x, i*step, l, o.Slot, 1)
|
|
}
|
|
})
|
|
}
|