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package ui
// A simple structure to detect if the cursor has not moved or started moving again.
// hoverDetector.update must be called during each Update invocation to track the
// frame and the current cursor position.
type hoverDetector struct {
last_x, last_y int
ticks int
hovering Hoverable
}
func (h *hoverDetector) update(collection *Collection, x, y int, w Widget) {
if x == h.last_x && y == h.last_y {
h.hover(collection, x, y, w)
} else {
h.reset(x, y)
h.last_x, h.last_y = x, y
}
}
func (h *hoverDetector) hover(collection *Collection, x, y int, w Widget) {
h.ticks++
if w == nil || h.hovering != nil {
return
}
if hoverable, ok := w.(Hoverable); ok && hoverable.onHover(h.ticks, x, y, collection) {
h.hovering = hoverable
}
}
func (h *hoverDetector) reset(x, y int) {
if h.hovering != nil {
if !h.hovering.stopHover(h.ticks, x, y) {
return
}
h.hovering = nil
}
h.ticks = 0
}
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