inputrects.go RawHistoryFolder

1package ui
2
3import (
4	"fmt"
5	"math"
6)
7
8// Rect is an integer logical-pixel rectangle in surface coordinates.
9type Rect struct{ X, Y, Width, Height int32 }
10
11// SetInputRects stages the input region for the surface: pointer input outside
12// the rectangles passes through. Renderer reports it in Output.InputRects when
13// it changes. nil restores the whole surface, and a non-nil empty slice makes
14// the surface click-through. Rects need positive size. The slice is copied, so
15// callers may reuse it; an unchanged region costs nothing.
16func (f *Frame) SetInputRects(rects []Rect) error {
17	if !f.active {
18		panic("nefergui: SetInputRects outside frame")
19	}
20	for i, r := range rects {
21		if r.Width <= 0 || r.Height <= 0 || int64(r.X)+int64(r.Width) > math.MaxInt32 || int64(r.Y)+int64(r.Height) > math.MaxInt32 {
22			return fmt.Errorf("nefergui: input rect %d %+v is empty or overflows", i, r)
23		}
24	}
25	o := f.owner
26	o.inputNil = rects == nil
27	o.inputRects = append(o.inputRects[:0], rects...)
28	o.inputStaged = true
29	return nil
30}