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package flamegraph
import "strings"
// ZoomNavigator manages the zoom path, stack, and root node for the flamegraph
// view. It tracks the current zoom level, supports undo via a stack, and rebuilds
// the frame layout whenever the zoom target changes.
type ZoomNavigator struct {
zoomPath string
zoomStack []zoomState
zoomRoot *snapshotNode
zoomLineWidth int
}
// currentRootPath returns the path of the current view root.
// When zoomed in, that is the zoom path; otherwise it is the first frame's path.
func (z *ZoomNavigator) currentRootPath(frames []tuiFrame) string {
if z.zoomPath != "" {
return z.zoomPath
}
if len(frames) == 0 {
return ""
}
return frames[0].Path
}
// rootSnapshotPath returns the canonical root path derived from the snapshot or frames.
func (z *ZoomNavigator) rootSnapshotPath(snapshot *snapshotNode, frames []tuiFrame) string {
if snapshot != nil {
return frameName(snapshot.Name, 0)
}
if len(frames) > 0 {
return frames[0].Path
}
return ""
}
// reset clears all zoom state and returns a status message.
func (z *ZoomNavigator) reset() string {
z.zoomRoot = nil
z.zoomPath = ""
z.zoomStack = nil
z.zoomLineWidth = 0
return "Zoom reset to root"
}
// alreadyAtRoot reports whether no zoom is active and the stack is empty.
func (z *ZoomNavigator) alreadyAtRoot() bool {
return z.zoomRoot == nil && len(z.zoomStack) == 0
}
// buildZoomStack builds the ancestor zoom stack for a direct deep-zoom path.
// It creates entries for every path prefix so undo walks back up one step at a
// time: root → A → A/A1 etc.
func buildZoomStack(path string) []zoomState {
parts := strings.Split(path, pathSeparator)
if len(parts) <= 1 {
return nil
}
stack := []zoomState{{path: ""}}
for idx := 1; idx < len(parts)-1; idx++ {
stack = append(stack, zoomState{path: strings.Join(parts[:idx+1], pathSeparator)})
}
return stack
}
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