37 lines
1008 B
Go
37 lines
1008 B
Go
package display
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import (
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"fmt"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type PlaceholderOptions struct {
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// W×H is zero for 64×48 dots.
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W, H int
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}
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// Placeholder is a dithered box with a cross and size.
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func Placeholder(c *ui.Context, o PlaceholderOptions) *ui.Element {
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k := pixel.K(c)
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w, h := pixel.Or("Placeholder W", o.W, 64), pixel.Or("Placeholder H", o.H, 48)
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size := fmt.Sprintf("%d×%d", w, h)
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return art(c, k, size, w, h, func(g pixel.Canvas) {
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if w < 3 || h < 3 {
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g.Dither(0, 0, w, h, pixel.Face, pixel.Shade, 4)
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return
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}
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g.Frame(0, 0, w, h, pixel.Flat, pixel.Face)
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g.Dither(1, 1, w-2, h-2, pixel.Face, pixel.Shade, 4)
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g.Line(1, 1, w-2, h-2, pixel.Shade)
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g.Line(w-2, 1, 1, h-2, pixel.Shade)
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tw := pixel.Measure(size)
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if tw+4 <= w && pixel.LineHeight <= h {
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g.Rect((w-tw)/2-2, (h-pixel.LineHeight)/2, tw+4, pixel.LineHeight, pixel.Face)
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g.Text((w-tw)/2, (h-pixel.LineHeight)/2, size, pixel.Faint, 1)
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}
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})
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}
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