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package flamegraph
import "time"
// FrameAnimator manages the animated transition between frame layouts. It owns
// the current frame slice, the target frame slice, the frame ancestry index, and
// the spring-based AnimationState. The Model delegates all layout-swap and
// animation-tick logic here.
type FrameAnimator struct {
animation AnimationState
animating bool
frames []tuiFrame
targetFrames []tuiFrame
ancestry frameAncestry
}
// newFrameAnimator constructs a FrameAnimator with spring parameters suitable
// for the default 30 fps / ω=6 / ζ=1 damping curve.
func newFrameAnimator() FrameAnimator {
return FrameAnimator{
animation: NewAnimationState(30, 6.0, 1.0),
}
}
// applyTargetFrames installs a new frame layout and ancestry index. When animate
// is true and a previous layout exists, it kicks off a spring animation from
// the current positions. When animate is false (zoom transitions, user driving),
// it snaps directly to the target.
//
// After swapping frames it restores the selection to prevPath, clamps it,
// recomputes the filter state, ensures visibility, and refreshes the subtree
// highlight — maintaining the same post-swap invariants as the old Model method.
func (fa *FrameAnimator) applyTargetFrames(
targetFrames []tuiFrame,
ancestry frameAncestry,
prevPath string,
animate bool,
sel *SelectionManager,
search *SearchController,
height int,
) {
fa.targetFrames = targetFrames
fa.ancestry = ancestry
fa.animation.SetTargets(fa.targetFrames)
if animate && len(fa.frames) > 0 && !fa.animation.Settled() {
fa.animating = true
fa.frames = fa.animation.CurrentFrames()
} else {
fa.animating = false
fa.frames = append(fa.frames[:0], fa.targetFrames...)
}
if len(fa.frames) > 1 {
sel.hasNavigableSnapshot = true
}
sel.restoreByPath(fa.frames, prevPath)
sel.clamp(fa.frames)
search.recomputeFilterState(fa.frames, fa.ancestry)
sel.ensureNavigable(fa.frames, search.matchIndices, search.searchQuery, search.filterVisible)
sel.ensureVisible(fa.frames, height, search.searchQuery, search.filterVisible)
sel.subtreeSet = subtreeSetUsingAncestry(fa.frames, sel.selectedIdx, fa.ancestry, sel.subtreeSet)
}
// tickAnimation advances the spring by one frame and updates the current frames.
// Returns true while animation is still active.
func (fa *FrameAnimator) tickAnimation(sel *SelectionManager, search *SearchController) bool {
fa.animating = fa.animation.Tick(0)
fa.frames = fa.animation.CurrentFrames()
sel.clamp(fa.frames)
sel.subtreeSet = subtreeSetUsingAncestry(fa.frames, sel.selectedIdx, fa.ancestry, sel.subtreeSet)
return fa.animating
}
// reset clears all frame/animation state, preserving the configured spring parameters.
func (fa *FrameAnimator) reset() {
fa.animation = NewAnimationState(30, 6.0, 1.0)
fa.animating = false
fa.frames = nil
fa.targetFrames = nil
fa.ancestry = frameAncestry{}
}
// frameIndexAt returns the index of the frame rendered at terminal coordinates
// (x, y), or -1 if no frame occupies that cell. showHelp adds one extra line
// to the UI chrome so the frame area row calculations account for it.
func frameIndexAt(frames []tuiFrame, x, y, width, height int, showHelp bool) int {
if len(frames) == 0 || width <= 0 || height <= 0 {
return -1
}
if x < 0 || x >= width || y < 0 {
return -1
}
extraLines := 1 // selection status line
if showHelp {
extraLines++
}
renderHeight := height - extraLines
if renderHeight < 3 {
renderHeight = 3
}
availableRows := renderHeight - 2 // flame toolbar + frame-status line
if availableRows < 1 {
return -1
}
// Row 0 is flame toolbar, rows 1..availableRows are bars, last row is status.
if y < 1 || y > availableRows {
return -1
}
targetRow := frameCoordToTargetRow(frames, y-1, availableRows)
if targetRow < 0 {
return -1
}
return findFrameAtRow(frames, targetRow, x, width)
}
// frameCoordToTargetRow converts a data-area row offset (0-based, after
// stripping the toolbar row) into the logical frame row index. Returns -1 when
// the coordinate falls in the top padding above the first visible row.
func frameCoordToTargetRow(frames []tuiFrame, dataRow, availableRows int) int {
maxRow := maxFrameRowForSet(frames, nil)
barHeight := computeBarHeight(availableRows, maxRow+1, maxBarVisualHeight)
visibleDepthRows := availableRows / barHeight
if visibleDepthRows < 1 {
visibleDepthRows = 1
}
rowOffset := 0
if maxRow+1 > visibleDepthRows {
rowOffset = maxRow + 1 - visibleDepthRows
}
renderedRows := (maxRow - rowOffset + 1) * barHeight
padTop := 0
if renderedRows < availableRows {
padTop = availableRows - renderedRows
}
if dataRow < padTop {
return -1
}
depthFromTop := (dataRow - padTop) / barHeight
return maxRow - depthFromTop
}
// findFrameAtRow scans frames for the narrowest one that occupies logical row
// targetRow and contains pixel column x within [0, width). Returning the
// narrowest frame resolves overlap between wide parent and narrow child bars.
func findFrameAtRow(frames []tuiFrame, targetRow, x, width int) int {
best := -1
bestWidth := int(^uint(0) >> 1)
for idx, frame := range frames {
if frame.Row != targetRow || frame.Col >= width {
continue
}
right := min(width, frame.Col+frame.Width)
if x < frame.Col || x >= right {
continue
}
if frame.Width < bestWidth {
best = idx
bestWidth = frame.Width
}
}
return best
}
// driveWindowActive reports whether lastKeyAt falls within the active drive
// window where the user is considered to be actively pressing keys.
func driveWindowActive(lastKeyAt time.Time) bool {
if lastKeyAt.IsZero() {
return false
}
return time.Since(lastKeyAt) < driveWindow
}
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