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Hadi
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package notification
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// Position anchors the toast stack to one of six spots on the rendered
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// background. There's no center/middle variant: toasts always hug an edge or
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// a corner, never the middle of the screen.
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type Position int
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const (
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Top Position = iota
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TopLeft
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TopRight
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Bottom
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BottomLeft
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BottomRight
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)
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// margin is the fixed gap, in cells, kept between the toast stack and the
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// edge(s) of the background it's anchored to.
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const margin = 1
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// placement resolves the top-left (x, y) coordinate to draw a stack of size
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// (sw, sh) at, given a background of size (w, h) and the anchor position.
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func placement(pos Position, w, h, sw, sh int) (x, y int) {
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switch pos {
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case Top:
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x = (w - sw) / 2
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y = margin
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case TopLeft:
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x = margin
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y = margin
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case TopRight:
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x = w - sw - margin
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y = margin
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case Bottom:
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x = (w - sw) / 2
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y = h - sh - margin
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case BottomLeft:
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x = margin
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y = h - sh - margin
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case BottomRight:
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x = w - sw - margin
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y = h - sh - margin
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}
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if x < 0 {
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x = 0
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}
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if y < 0 {
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y = 0
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}
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return x, y
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}
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// anchoredTop reports whether pos hugs the top edge, which decides both the
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// stacking order (see Model.orderedToasts) and which side of an overflowing
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// stack gets clipped (see clipToHeight).
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func (pos Position) anchoredTop() bool {
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return pos == Top || pos == TopLeft || pos == TopRight
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}
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