84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
package layout
|
||
|
||
import (
|
||
"fmt"
|
||
"log/slog"
|
||
|
||
"github.com/egoist/mygo/ui"
|
||
|
||
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
|
||
)
|
||
|
||
type ResizableOptions struct {
|
||
// MinW and MinH are zero for 24.
|
||
MinW, MinH int
|
||
// MaxW and MaxH are zero for no limit.
|
||
MaxW, MaxH int
|
||
Label string
|
||
Disabled bool
|
||
}
|
||
|
||
type ResizableResult struct {
|
||
Element *ui.Element
|
||
Changed bool
|
||
}
|
||
|
||
// Resizable is a *w×*h dot box with a ◢ grip.
|
||
func Resizable(c *ui.Context, w, h *int, o ResizableOptions, children func()) ResizableResult {
|
||
k := pixel.K(c)
|
||
minW, minH := pixel.Or("Resizable MinW", o.MinW, 24), pixel.Or("Resizable MinH", o.MinH, 24)
|
||
maxW, maxH := pixel.Or("Resizable MaxW", o.MaxW, 0), pixel.Or("Resizable MaxH", o.MaxH, 0)
|
||
if maxW > 0 && maxW < minW || maxH > 0 && maxH < minH {
|
||
panic(fmt.Sprintf("layout: Resizable max %d×%d under min %d×%d", maxW, maxH, minW, minH))
|
||
}
|
||
clamp := func(v, lo, hi int) int {
|
||
if hi > 0 {
|
||
v = min(v, hi)
|
||
}
|
||
return max(v, lo)
|
||
}
|
||
was := [2]int{*w, *h}
|
||
e := ui.Box(c).Clip()
|
||
e.Children(func() {
|
||
children()
|
||
shell, base, st := pixel.Shell(c, func() *ui.Element {
|
||
return ui.Box(c).Focusable().Role(ui.RoleSplitter).Label(label(k, o.Label, "resize")).Disabled(o.Disabled).Cursor(ui.CursorResizeNWSE)
|
||
})
|
||
if dx, dy, ok := drag(k, base); ok {
|
||
*w, *h = *w+dx, *h+dy
|
||
}
|
||
for key, d := range map[ui.Key][2]int{ui.KeyLeft: {-4, 0}, ui.KeyRight: {4, 0}, ui.KeyUp: {0, -4}, ui.KeyDown: {0, 4}} {
|
||
if !o.Disabled && base.Shortcut(0, key) {
|
||
*w, *h = *w+d[0], *h+d[1]
|
||
}
|
||
}
|
||
shell.Absolute().Right(0).Bottom(0).Size(k.D(9), k.D(9)).Draw(func(p *ui.Painter, r ui.Rect) { corner(k.Canvas(p, r), st) })
|
||
})
|
||
*w, *h = clamp(*w, minW, maxW), clamp(*h, minH, maxH)
|
||
e.Size(k.D(*w), k.D(*h))
|
||
res := ResizableResult{Element: e, Changed: [2]int{*w, *h} != was}
|
||
if res.Changed {
|
||
slog.Debug("8bit: resizable", "w", *w, "h", *h)
|
||
}
|
||
return res
|
||
}
|
||
|
||
// corner is a ◢ of three ridges in the bottom-right.
|
||
func corner(g pixel.Canvas, st pixel.State) {
|
||
for _, s := range []int{2, 5, 8} {
|
||
for i := 0; i <= s; i++ {
|
||
x, y := g.W-1-s+i, g.H-1-i
|
||
g.Dot(x, y, pixel.Shade)
|
||
if x > 0 && y > 0 {
|
||
g.Dot(x-1, y-1, pixel.Lit)
|
||
}
|
||
}
|
||
}
|
||
if st.Disabled {
|
||
g.Checker(0, 0, g.W, g.H, pixel.Face)
|
||
}
|
||
if st.Focus {
|
||
g.FocusMark(0, 0, g.W, g.H)
|
||
}
|
||
}
|