58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
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package views
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import (
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"image"
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"git.milar.in/milarin/gui"
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)
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type AnchorView struct {
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gui.WrapperTmpl
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Anchor gui.Anchor
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}
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var _ gui.View = &AnchorView{}
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func NewAnchorView(view gui.View, anchor gui.Anchor) *AnchorView {
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v := &AnchorView{Anchor: anchor}
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v.SetView(view)
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return v
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}
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func (v *AnchorView) Draw(img *gui.Image, ctx gui.AppContext) {
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var pos image.Point
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w, h := v.View().Layout(ctx)
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w = iff(w >= 0, w, img.Bounds().Dx())
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h = iff(h >= 0, h, img.Bounds().Dy())
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vw, vh := img.Bounds().Dx(), img.Bounds().Dy()
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switch v.Anchor {
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case gui.AnchorTopLeft:
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pos = image.Pt(0, 0)
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case gui.AnchorTop:
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pos = image.Pt(vw/2-w/2, 0)
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case gui.AnchorTopRight:
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pos = image.Pt(vw-w, 0)
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case gui.AnchorLeft:
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pos = image.Pt(0, vh/2-h/2)
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case gui.AnchorCenter:
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pos = image.Pt(vw/2-w/2, vh/2-h/2)
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case gui.AnchorRight:
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pos = image.Pt(vw-w, vh/2-h/2)
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case gui.AnchorBottomLeft:
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pos = image.Pt(0, vh-h)
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case gui.AnchorBottom:
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pos = image.Pt(0, vh-h)
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case gui.AnchorBottomRight:
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pos = image.Pt(vw-w, vh-h)
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default:
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panic("invalid anchor in AnchorView")
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}
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pos = pos.Add(img.Bounds().Min)
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rect := image.Rect(pos.X, pos.Y, pos.X+w, pos.Y+h)
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v.View().Draw(img.SubImage(rect).(*gui.Image), ctx)
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}
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