1package core
2
3import (
4 "fmt"
5 "math"
6 "math/bits"
7 "slices"
8 "strconv"
9 "strings"
10 "time"
11
12 "github.com/bnema/neferwl/internal/ports"
13)
14
15type WindowID = ports.WindowID
16
17type Rect = ports.Rect
18
19type Width struct{ Num, Den, Pixels int }
20
21func ParseWidth(s string) (Width, error) {
22 if s == "1" {
23 return Width{Num: 1, Den: 1}, nil
24 }
25 if strings.HasSuffix(s, "px") {
26 n, e := strconv.Atoi(strings.TrimSuffix(s, "px"))
27 if e == nil && n > 0 {
28 return Width{Pixels: n}, nil
29 }
30 } else if strings.HasSuffix(s, "%") {
31 n, e := strconv.Atoi(strings.TrimSuffix(s, "%"))
32 if e == nil && n > 0 && n <= 100 {
33 return Width{Num: n, Den: 100}, nil
34 }
35 } else {
36 p := strings.Split(s, "/")
37 if len(p) == 2 {
38 a, e1 := strconv.Atoi(p[0])
39 b, e2 := strconv.Atoi(p[1])
40 if e1 == nil && e2 == nil && a > 0 && a <= b {
41 return Width{Num: a, Den: b}, nil
42 }
43 }
44 }
45 return Width{}, fmt.Errorf("invalid width %q", s)
46}
47
48// same reports whether v and o are the same width: 1/2 and 50/100 are.
49func (v Width) same(o Width) bool {
50 if v.Pixels > 0 || o.Pixels > 0 || v.Den == 0 || o.Den == 0 {
51 return v == o
52 }
53 return v.Num*o.Den == o.Num*v.Den
54}
55
56// Resolve returns column pixels: round(frac * (usableW - gaps)) - gaps.
57// Widths are clamped to the available area (zero if no space remains).
58func (v Width) Resolve(usableW, gaps int) int {
59 if usableW <= 0 {
60 return 0
61 }
62 gaps = min(max(gaps, 0), usableW/2)
63 limit := max(usableW-2*gaps, 0)
64 if limit == 0 {
65 return 0
66 }
67 if v.Pixels > 0 {
68 return min(v.Pixels, limit)
69 }
70 if v.Den <= 0 || v.Num <= 0 {
71 return 1
72 }
73 // Cap invalid fractions above one before multiplying; the result would
74 // be clamped to the available width anyway.
75 num, den := uint64(min(v.Num, v.Den)), uint64(v.Den)
76 avail := uint64(usableW - gaps)
77 q, r := avail/den, avail%den
78 hi, lo := bits.Mul64(r, num)
79 lo, carry := bits.Add64(lo, den/2, 0)
80 hi += carry
81 // hi < den: r and num are both smaller than den.
82 fraction, _ := bits.Div64(hi, lo, den)
83 rounded := q*num + fraction // no larger than avail (plus rounding)
84 if rounded <= uint64(gaps) {
85 return 1
86 }
87 return int(min(rounded-uint64(gaps), uint64(limit)))
88}
89
90// Column.Width is zero (auto) until the user picks a preset: auto columns share
91// the usable width equally, up to MaxColumns visible at once.
92type Column struct {
93 Windows []WindowID
94 Width Width
95 FullWidth bool
96 // Expanded is the fixed-overflow wide column: max-columns - 1 cells,
97 // the others share the last one. One column at most has it.
98 Expanded bool
99 Focus int
100 // Slot is the declared column number (workspace.<name>.column.N) of a
101 // slot window; 0 for normal columns.
102 Slot int
103 // Shares are the row heights set by set-window-height, in percent, in
104 // Windows order. They apply only while there is one per window and
105 // they sum to 100; otherwise the rows share the height equally.
106 Shares []int
107}
108type Placement struct {
109 ID WindowID
110 Rect Rect
111 Fullscreen, Focused, Hidden bool
112 // Floating windows sit at their own size. Below marks a native float
113 // ordered behind the columns (never a stashed window).
114 Floating, Below bool
115 // Peek is a stashed window peeking in beside the selected one, or an
116 // overview preview of a neighbor workspace: dimmed.
117 Peek bool
118 // Preview is the scale of an overview preview: its buffer is drawn
119 // that much smaller in Rect, the client keeps its size. 0 otherwise.
120 Preview float64
121 // Neighbors are the sides touching a visible tile on this output.
122 // Inset reserves room for drawn lines: all sides of a float; for
123 // tiles without gaps, only the right and bottom shared sides.
124 Neighbors, Inset ports.Sides
125}
126
127// Overflow says what happens past MaxColumns columns.
128type Overflow string
129
130const (
131 // OverflowScroll opens further columns to the right; the view scrolls.
132 OverflowScroll Overflow = "scroll"
133 // OverflowFixed keeps every column on screen: past the max, each new
134 // column splits the newest one, alternating top/bottom and left/right
135 // (dwindle spiral).
136 OverflowFixed Overflow = "fixed"
137)
138
139type Workspace struct {
140 // ID stays with the workspace across reorder and monitor moves.
141 ID uint64
142 // Name is set for workspaces declared in config; empty for dynamic ones.
143 Name string
144 // overviewAfter is the numbered workspace from which this named workspace
145 // was invoked. It only orders overview rows; numbering stays unchanged.
146 overviewAfter *Workspace
147 Overflow Overflow
148 Columns []Column
149 // maximized remembers recently maximized columns by window ID, newest
150 // first; stack() filters removed windows at read time.
151 maximized []WindowID
152 Focus int
153 ViewX int
154 // shift slides the columns on screen past ViewX, in logical pixels,
155 // while a swipe follows the fingers or its spring (motion) lands.
156 shift float64
157 motion *motion
158 // Output is the effective viewport in monitor coordinates: the whole
159 // monitor unless the workspace has a size override, then a centered
160 // rectangle no larger than the monitor. Fullscreen fills it.
161 Output Rect
162 // Usable is the layer reservations of the monitor intersected with Output.
163 Usable Rect
164 // monitor is the full logical monitor and reserved its area left by
165 // layer surfaces, both from the monitor; size is the override (0 inherits).
166 monitor, reserved Rect
167 size [2]int
168 Gaps int
169 MaxColumns int
170 // border is drawn around floating windows, inside their rect.
171 border int
172 presets []Width
173 fullscreen WindowID
174 // left is the window whose fullscreen the user left for another
175 // window: its client requests are refused until it is focused again,
176 // so an app that re-asks at once (Wine) does not cover that window.
177 left WindowID
178 // Floats are native floating windows in user selection order;
179 // below/above and dialog groups determine their layout order.
180 Floats []Float
181 floatFocus bool
182 // Stash holds the windows set aside by toggle-window-stash, left to
183 // right (stash.go); stashAt is the selected one. stashFocus is set
184 // while it has the focus, under a focused native float.
185 Stash []Float
186 stashAt int
187 stashFocus bool
188 stashHidden bool
189 // stashWidth is the width of a stashed window (0: the default) and
190 // stashGap the space between it and its neighbors, in percent of the
191 // usable width.
192 stashWidth, stashGap int
193 // hiddenFullscreen holds a stashed window's fullscreen while the stash
194 // is hidden, restored when shown.
195 hiddenFullscreen WindowID
196 // home is the monitor (key or connector) the workspace belongs to; ""
197 // means the one it is on. On another monitor it is a guest; homePos is
198 // its position there, where it returns.
199 home string
200 homePos int
201 // termAt is when core last spawned a terminal for this workspace.
202 termAt time.Time
203}
204
205// origPlace remembers where a stashed window was: its column, its row in a
206// stacked column, the column's width and slot.
207type origPlace struct {
208 col, row, slot int
209 // stacked holds the windows left in the column: the window returns to
210 // its row in the column that still holds one of them.
211 stacked []WindowID
212 width Width
213 expanded bool
214 // fullWidth is the column's maximize-column state.
215 fullWidth bool
216}
217
218// Float is a floating window and its client size, logical.
219type Float struct {
220 ID WindowID
221 W, H int
222 // below places a covering native float behind columns and stash.
223 below bool
224 // back records the former column of a stashed window or a free float;
225 // nil for native floats.
226 back *origPlace
227 // free marks a window the user floated (toggle-floating) or dragged:
228 // core owns its size and its centre is at cx, cy, fractions of the
229 // usable area, so it keeps its place on any output.
230 free bool
231 cx, cy float64
232}
233
234func (w *Workspace) empty() bool {
235 return len(w.Columns) == 0 && len(w.Floats) == 0 && len(w.Stash) == 0
236}
237
238// windows lists every window: columns first, then the stash, then native
239// floats.
240func (w *Workspace) windows() []WindowID {
241 var ids []WindowID
242 for _, c := range w.Columns {
243 ids = append(ids, c.Windows...)
244 }
245 for _, f := range w.Stash {
246 ids = append(ids, f.ID)
247 }
248 for _, f := range w.Floats {
249 ids = append(ids, f.ID)
250 }
251 return ids
252}
253
254func (w *Workspace) floatIndex(id WindowID) int {
255 return slices.IndexFunc(w.Floats, func(f Float) bool { return f.ID == id })
256}
257
258// coversFloat uses the placed rectangle, not a map-time size. Allow up to
259// two border widths plus two logical pixels per axis for scale rounding.
260func (w *Workspace) coversFloat(f Float) bool {
261 if w.fullscreen == f.ID || w.Usable.W <= 0 || w.Usable.H <= 0 {
262 return false
263 }
264 r := w.floatRect(f)
265 return w.Usable.W-r.W <= 2*w.border+2 && w.Usable.H-r.H <= 2*w.border+2
266}
267
268// reconcileFloats promotes floats that no longer cover, without raising
269// existing covering floats on automatic geometry changes. It also drops
270// float focus when no raised float remains on top.
271func (w *Workspace) reconcileFloats() {
272 for i := range w.Floats {
273 if w.Floats[i].below && !w.coversFloat(w.Floats[i]) && w.fullscreen != w.Floats[i].ID {
274 w.Floats[i].below = false
275 }
276 }
277 if len(w.Floats) == 0 || w.Floats[len(w.Floats)-1].below {
278 w.floatFocus = false
279 }
280}
281
282// canLeaveFloat reports whether columns or a shown stash can receive focus.
283func (w *Workspace) canLeaveFloat() bool {
284 return len(w.Columns) > 0 || !w.stashHidden && len(w.Stash) > 0
285}
286
287// leaveFloat moves focus to the columns or shown stash under the float.
288// Without either, it keeps focus and reports false.
289func (w *Workspace) leaveFloat() bool {
290 if !w.canLeaveFloat() {
291 return false
292 }
293 w.floatFocus = false
294 w.raiseColumns()
295 return true
296}
297
298// raiseColumns moves only covering floats above the columns behind them.
299// The user-selected column group rises as one; dialogs remain above it.
300func (w *Workspace) raiseColumns() {
301 for i := range w.Floats {
302 if w.coversFloat(w.Floats[i]) {
303 w.Floats[i].below = true
304 }
305 }
306}
307
308// AddFloating shows a native floating window over the columns and the
309// stash, and focuses it.
310func (w *Workspace) AddFloating(id WindowID, width, height int) {
311 if id == 0 || w.has(id) {
312 return
313 }
314 w.Floats = append(w.Floats, Float{ID: id, W: width, H: height})
315 w.floatFocus = true
316}
317
318// ResizeFloating records the size a floating window draws. Core sizes a
319// free float: its reports only fill a missing size.
320func (w *Workspace) ResizeFloating(id WindowID, width, height int) {
321 if i := w.floatIndex(id); i >= 0 && (!w.Floats[i].free || w.Floats[i].W <= 0) {
322 w.Floats[i].W, w.Floats[i].H = width, height
323 w.reconcileFloats()
324 }
325}
326
327// has reports whether the workspace holds the window.
328func (w *Workspace) has(id WindowID) bool {
329 if w.isFloat(id) {
330 return true
331 }
332 for _, c := range w.Columns {
333 for _, v := range c.Windows {
334 if v == id {
335 return true
336 }
337 }
338 }
339 return false
340}
341
342func (w *Workspace) Focused() (WindowID, bool) {
343 // Nothing else is drawn: the covering fullscreen window has the focus.
344 if full := w.cover(); full != 0 {
345 return full, true
346 }
347 if w.floatFocus && len(w.Floats) > 0 && !w.Floats[len(w.Floats)-1].below {
348 return w.Floats[len(w.Floats)-1].ID, true
349 }
350 if w.stashFocused() {
351 return w.Stash[w.stashAt].ID, true
352 }
353 if w.Focus < 0 || w.Focus >= len(w.Columns) {
354 return 0, false
355 }
356 c := w.Columns[w.Focus]
357 if c.Focus < 0 || c.Focus >= len(c.Windows) {
358 return 0, false
359 }
360 return c.Windows[c.Focus], true
361}
362func (w *Workspace) AddWindow(id WindowID) {
363 if id == 0 || w.has(id) {
364 return
365 }
366 if w.cover() != 0 {
367 // A new window never moves the view off a covering fullscreen
368 // window (ADR 011): it waits, hidden, after the focused column.
369 at := len(w.Columns)
370 if w.Overflow != OverflowFixed {
371 // A covering float or stashed window may have no column under it.
372 at = min(w.Focus+1, len(w.Columns))
373 }
374 w.Columns = slices.Insert(w.Columns, at, Column{Windows: []WindowID{id}})
375 return
376 }
377 w.addColumn(Column{Windows: []WindowID{id}})
378}
379
380// addColumn places a new column like a new window and focuses it.
381func (w *Workspace) addColumn(col Column) {
382 at := 0
383 if w.Overflow == OverflowFixed {
384 // The spiral depends only on window order: new windows go last.
385 at = len(w.Columns)
386 } else if len(w.Columns) > 0 {
387 at = w.Focus + 1
388 }
389 if w.Overflow == OverflowFixed && len(w.Columns) > 0 {
390 w.unmaximize()
391 }
392 w.Columns = append(w.Columns, Column{})
393 copy(w.Columns[at+1:], w.Columns[at:])
394 w.Columns[at] = col
395 w.Focus = at
396 w.scroll()
397}
398
399// AddSlotWindow places a slot window in its own column, ordered by slot
400// number before the other columns. Focus stays on the focused window: slot
401// windows are automatic events (ADR 011 golden rule).
402func (w *Workspace) AddSlotWindow(id WindowID, slot int, width Width) {
403 if id == 0 || w.has(id) {
404 return
405 }
406 // Right after the last slot column with a lower number, else first.
407 at := 0
408 for i, c := range w.Columns {
409 if c.Slot > 0 && c.Slot < slot {
410 at = i + 1
411 }
412 }
413 w.Columns = slices.Insert(w.Columns, at, Column{Windows: []WindowID{id}, Width: width, Slot: slot})
414 if len(w.Columns) > 1 && at <= w.Focus {
415 w.Focus++
416 }
417 w.scroll()
418}
419
420// setSlotWidth updates the width of slot column n, if present.
421func (w *Workspace) setSlotWidth(n int, width Width) {
422 for i := range w.Columns {
423 if w.Columns[i].Slot == n {
424 w.Columns[i].Width = width
425 }
426 }
427 w.scroll()
428}
429
430// inSlot reports whether window id is in slot column n.
431func (w *Workspace) inSlot(id WindowID, n int) bool {
432 for _, c := range w.Columns {
433 if c.Slot == n && slices.Contains(c.Windows, id) {
434 return true
435 }
436 }
437 return false
438}
439
440// unslot turns slot column n into a normal column.
441func (w *Workspace) unslot(n int) {
442 for i := range w.Columns {
443 if w.Columns[i].Slot == n {
444 w.Columns[i].Slot = 0
445 }
446 }
447}
448
449func (w *Workspace) RemoveWindow(id WindowID) {
450 w.maximized = slices.DeleteFunc(w.maximized, func(v WindowID) bool { return v == id })
451 if w.fullscreen == id {
452 w.fullscreen = 0
453 }
454 if w.hiddenFullscreen == id {
455 w.hiddenFullscreen = 0
456 }
457 if w.left == id {
458 w.left = 0
459 }
460 if i := w.floatIndex(id); i >= 0 {
461 w.Floats = slices.Delete(w.Floats, i, i+1)
462 if len(w.Floats) == 0 || w.Floats[len(w.Floats)-1].below {
463 w.floatFocus = false
464 }
465 return
466 }
467 if i := w.stashIndex(id); i >= 0 {
468 // The right neighbor takes the selection, else the left one.
469 w.Stash = slices.Delete(w.Stash, i, i+1)
470 if i < w.stashAt || w.stashAt == len(w.Stash) {
471 w.stashAt = max(w.stashAt-1, 0)
472 }
473 if len(w.Stash) == 0 {
474 w.stashFocus, w.stashHidden = false, false
475 }
476 return
477 }
478 for i := range w.Columns {
479 for j, v := range w.Columns[i].Windows {
480 if v != id {
481 continue
482 }
483 c := &w.Columns[i]
484 c.Windows = append(c.Windows[:j], c.Windows[j+1:]...)
485 c.Shares = nil
486 if len(c.Windows) == 0 {
487 w.Columns = append(w.Columns[:i], w.Columns[i+1:]...)
488 if len(w.Columns) == 0 {
489 w.Focus = 0
490 w.ViewX = 0
491 return
492 }
493 if i < w.Focus || (i == w.Focus && i > 0) {
494 w.Focus--
495 }
496 } else {
497 if j < c.Focus {
498 c.Focus--
499 } else if j == c.Focus && c.Focus > 0 {
500 c.Focus--
501 }
502 }
503 w.scroll()
504 return
505 }
506 }
507}
508
509// FocusID selects a window and scrolls its column into view; a native
510// float is raised, a stashed window is selected.
511func (w *Workspace) FocusID(id WindowID) bool {
512 if i := w.floatIndex(id); i >= 0 {
513 f := w.Floats[i]
514 f.below = false
515 w.Floats = append(slices.Delete(w.Floats, i, i+1), f)
516 w.floatFocus = true
517 return true
518 }
519 if i := w.stashIndex(id); i >= 0 {
520 if w.stashHidden {
521 return false
522 }
523 w.stashAt, w.stashFocus, w.floatFocus = i, true, false
524 return true
525 }
526 for i := range w.Columns {
527 for j, v := range w.Columns[i].Windows {
528 if v == id {
529 w.floatFocus, w.stashFocus = false, false
530 w.raiseColumns()
531 if w.Overflow == OverflowFixed && w.Focus != i && w.Focus < len(w.Columns) && !w.Columns[i].FullWidth {
532 w.unmaximize()
533 }
534 w.Focus = i
535 w.Columns[i].Focus = j
536 w.scroll()
537 return true
538 }
539 }
540 }
541 return false
542}
543
544// FocusColumn moves focus to the column on that side. From a covering
545// fullscreen window it leaves fullscreen for the window there (leaveCover);
546// false means it stays, with no window on that side.
547func (w *Workspace) FocusColumn(dir int) bool {
548 if w.pinned() {
549 return w.leaveCover(func() { w.focusColumn(dir) })
550 }
551 w.focusColumn(dir)
552 return true
553}
554
555func (w *Workspace) focusColumn(dir int) {
556 if w.floatFocus {
557 // The first move leaves the native float for the stash or columns,
558 // if there is one: otherwise the float keeps the focus.
559 w.leaveFloat()
560 return
561 }
562 if w.stashFocused() {
563 // Inside the stash, stopping at its ends: only hiding it leaves.
564 if (dir == -1 || dir == 1) && w.stashAt+dir >= 0 && w.stashAt+dir < len(w.Stash) {
565 w.stashAt += dir
566 }
567 return
568 }
569 if i := w.columnToward(dir); i >= 0 {
570 w.raiseColumns()
571 if w.Overflow == OverflowFixed {
572 w.unmaximize()
573 }
574 w.Focus = i
575 w.scroll()
576 }
577}
578
579// columnToward returns the column focus-column-left/right (dir -1/1) goes
580// to, or -1 at the edge. Scroll overflow follows the column order; fixed
581// overflow stacks columns (spiral, expanded strips), so it follows the
582// screen: the column on that side.
583func (w *Workspace) columnToward(dir int) int {
584 if len(w.Columns) == 0 || (dir != -1 && dir != 1) || w.pinned() {
585 return -1
586 }
587 if w.onScreenFocus() {
588 return w.screenNeighbor(dir, 0)
589 }
590 if i := w.Focus + dir; i >= 0 && i < len(w.Columns) {
591 return i
592 }
593 return -1
594}
595
596// onScreenFocus reports whether directional focus follows the screen:
597// fixed overflow with every column visible.
598func (w *Workspace) onScreenFocus() bool {
599 return w.Overflow == OverflowFixed && w.fullscreen == 0 && !w.Columns[w.Focus].FullWidth
600}
601
602// FocusWindow moves focus inside the column, then to a fixed-overflow column
603// above or below on screen. Up at the top raises the topmost demoted covering
604// float; false means no window is available in that direction. From a
605// covering fullscreen window it leaves fullscreen for that window.
606func (w *Workspace) FocusWindow(dir int) bool {
607 if w.pinned() {
608 return w.leaveCover(func() { w.focusWindow(dir) })
609 }
610 return w.focusWindow(dir)
611}
612
613func (w *Workspace) focusWindow(dir int) bool {
614 if w.floatFocus {
615 return w.leaveFloat()
616 }
617 if w.stashFocused() {
618 // The stash is one row: up and down do nothing there.
619 return true
620 }
621 if len(w.Columns) == 0 || (dir != -1 && dir != 1) {
622 return false
623 }
624 c := &w.Columns[w.Focus]
625 if c.Focus+dir >= 0 && c.Focus+dir < len(c.Windows) {
626 c.Focus += dir
627 w.raiseColumns()
628 w.scroll()
629 return true
630 }
631 if w.onScreenFocus() {
632 if i := w.screenNeighbor(0, dir); i >= 0 {
633 w.Focus = i
634 w.raiseColumns()
635 w.Columns[i].Focus = 0
636 if dir < 0 {
637 w.Columns[i].Focus = len(w.Columns[i].Windows) - 1
638 }
639 return true
640 }
641 }
642 if dir < 0 {
643 for i := len(w.Floats) - 1; i >= 0; i-- {
644 if f := w.Floats[i]; f.below && w.coversFloat(f) {
645 return w.FocusID(f.ID)
646 }
647 }
648 }
649 return false
650}
651
652// screenNeighbor returns the column on screen next to the focused one, left
653// or right (dx -1/1) or above or below (dy -1/1), or -1. The closest wins,
654// then the one sharing the longest edge, then the nearest in column order.
655func (w *Workspace) screenNeighbor(dx, dy int) int {
656 rects := w.columnRects()
657 cur := rects[w.Focus]
658 best, bestDist, bestOverlap := -1, 0, 0
659 for i, r := range rects {
660 var overlap, dist int
661 switch {
662 case dx < 0:
663 overlap, dist = min(cur.Y+cur.H, r.Y+r.H)-max(cur.Y, r.Y), cur.X-(r.X+r.W)
664 case dx > 0:
665 overlap, dist = min(cur.Y+cur.H, r.Y+r.H)-max(cur.Y, r.Y), r.X-(cur.X+cur.W)
666 case dy < 0:
667 overlap, dist = min(cur.X+cur.W, r.X+r.W)-max(cur.X, r.X), cur.Y-(r.Y+r.H)
668 default:
669 overlap, dist = min(cur.X+cur.W, r.X+r.W)-max(cur.X, r.X), r.Y-(cur.Y+cur.H)
670 }
671 if i == w.Focus || overlap <= 0 || dist < 0 {
672 continue
673 }
674 closer := best >= 0 && (dist < bestDist || dist == bestDist && (overlap > bestOverlap ||
675 overlap == bestOverlap && abs(i-w.Focus) < abs(best-w.Focus)))
676 if best < 0 || closer {
677 best, bestDist, bestOverlap = i, dist, overlap
678 }
679 }
680 return best
681}
682
683func abs(n int) int { return max(n, -n) }
684func (w *Workspace) MoveColumn(dir int) {
685 if w.onFloat() {
686 return
687 }
688 if (dir == -1 || dir == 1) && w.Focus+dir >= 0 && w.Focus+dir < len(w.Columns) {
689 i := w.Focus
690 w.Columns[i], w.Columns[i+dir] = w.Columns[i+dir], w.Columns[i]
691 w.Focus += dir
692 w.scroll()
693 }
694}
695
696// MoveWindow moves the focused tile up or down (dir -1/1) inside its
697// column; focus follows it. A slot window leaving row 0 releases the slot.
698func (w *Workspace) MoveWindow(dir int) {
699 if w.onFloat() || len(w.Columns) == 0 || (dir != -1 && dir != 1) || w.fullscreenHides() {
700 return
701 }
702 c := &w.Columns[w.Focus]
703 to := c.Focus + dir
704 if to < 0 || to >= len(c.Windows) {
705 return
706 }
707 if c.Focus == 0 || to == 0 {
708 w.dropSlotOf(c.Windows[0])
709 }
710 c.Windows[c.Focus], c.Windows[to] = c.Windows[to], c.Windows[c.Focus]
711 if validShares(*c) {
712 c.Shares[c.Focus], c.Shares[to] = c.Shares[to], c.Shares[c.Focus]
713 }
714 c.Focus = to
715 w.scroll()
716}
717
718// ResizeColumn changes the focused column's width by pct percent of the
719// usable width, clamped to 10-100%. An auto column becomes explicit. Fixed
720// overflow shares the width equally: nothing changes there.
721func (w *Workspace) ResizeColumn(pct int) {
722 if w.onFloat() || len(w.Columns) == 0 || w.Overflow == OverflowFixed || w.fullscreenHides() {
723 return
724 }
725 w.unmaximize()
726 g := w.gap()
727 avail := w.Usable.W - g
728 if avail <= 0 {
729 return
730 }
731 // Inverse of Width.Resolve: width = round(p/100 * avail) - g.
732 cur := (200*(w.columnWidth(w.Focus)+g) + avail) / (2 * avail)
733 w.Columns[w.Focus].Width = Width{Num: min(max(cur+pct, 10), 100), Den: 100}
734 w.scroll()
735}
736
737// minShare is the smallest row height set-window-height leaves, percent.
738const minShare = 10
739
740// ResizeRow changes the focused window's height share by pct percent; the
741// other rows of its column give or take it in proportion to their shares.
742// Every row keeps at least minShare percent.
743func (w *Workspace) ResizeRow(pct int) {
744 if w.onFloat() || len(w.Columns) == 0 || w.fullscreenHides() {
745 return
746 }
747 c := &w.Columns[w.Focus]
748 n := len(c.Windows)
749 if n < 2 || n*minShare > 100 {
750 return
751 }
752 shares := c.Shares
753 if !validShares(*c) {
754 shares = make([]int, n)
755 for i := range shares {
756 shares[i] = 100 / n
757 }
758 shares[n-1] += 100 % n
759 } else {
760 shares = slices.Clone(shares)
761 }
762 f := c.Focus
763 target := min(max(shares[f]+pct, minShare), 100-minShare*(n-1))
764 delta := target - shares[f]
765 if delta == 0 {
766 return
767 }
768 // The others share -delta in proportion to their room: what they have
769 // above minShare when shrinking, their share when growing.
770 weight := func(v int) int {
771 if delta > 0 {
772 return v - minShare
773 }
774 return v
775 }
776 total := 0
777 for i, v := range shares {
778 if i != f {
779 total += weight(v)
780 }
781 }
782 left := delta
783 for i, v := range shares {
784 if i == f {
785 continue
786 }
787 part := 0
788 if total > 0 {
789 part = delta * weight(v) / total
790 }
791 shares[i] = v - part
792 left -= part
793 }
794 shares[f] = target
795 // Rounding: the remainder goes to the rows that still have room, last
796 // first.
797 for i := n - 1; left != 0 && i >= 0; i-- {
798 if i == f {
799 continue
800 }
801 step := left
802 if left > 0 {
803 step = min(left, shares[i]-minShare)
804 }
805 shares[i] -= step
806 left -= step
807 }
808 c.Shares = shares
809}
810
811// takeColumn removes the focused column and returns it, as a normal column.
812func (w *Workspace) takeColumn() (Column, bool) {
813 if len(w.Columns) == 0 || w.onFloat() {
814 return Column{}, false
815 }
816 col := w.Columns[w.Focus]
817 col.Slot, col.Expanded = 0, false
818 if slices.Contains(col.Windows, w.fullscreen) {
819 w.fullscreen = 0
820 }
821 if slices.Contains(col.Windows, w.left) {
822 w.left = 0
823 }
824 w.Columns = slices.Delete(w.Columns, w.Focus, w.Focus+1)
825 w.Focus = min(w.Focus, max(len(w.Columns)-1, 0))
826 if len(w.Columns) == 0 {
827 w.ViewX = 0
828 } else {
829 w.scroll()
830 }
831 return col, true
832}
833
834// insertColumn adds a column at index at (clamped) and focuses it.
835func (w *Workspace) insertColumn(at int, col Column) {
836 at = min(max(at, 0), len(w.Columns))
837 if w.Overflow == OverflowFixed && len(w.Columns) > 0 {
838 w.unmaximize()
839 }
840 w.Columns = slices.Insert(w.Columns, at, col)
841 w.Focus = at
842 w.scroll()
843}
844
845// CycleWidth steps the focused column through the presets. Fixed overflow
846// ignores presets: it toggles the expanded column instead.
847func (w *Workspace) CycleWidth() {
848 if w.Overflow == OverflowFixed {
849 w.toggleExpanded()
850 return
851 }
852 if len(w.Columns) == 0 || len(w.presets) == 0 || w.onFloat() {
853 return
854 }
855 // auto → presets in order → auto; a width set by set-column-width
856 // restarts at the first preset.
857 c := &w.Columns[w.Focus]
858 next := Width{}
859 if c.Width == next || !slices.ContainsFunc(w.presets, c.Width.same) {
860 next = w.presets[0]
861 }
862 for i, v := range w.presets {
863 if v.same(c.Width) && i+1 < len(w.presets) {
864 next = w.presets[i+1]
865 break
866 }
867 }
868 c.Width = next
869 w.unmaximize()
870 w.scroll()
871}
872
873// toggleExpanded makes the focused column the expanded one, or shrinks it
874// back when it already is. One column at most is expanded.
875func (w *Workspace) toggleExpanded() {
876 if len(w.Columns) < 2 || max(w.MaxColumns, 1) < 2 || w.onFloat() {
877 return
878 }
879 on := !w.Columns[w.Focus].Expanded
880 for i := range w.Columns {
881 w.Columns[i].Expanded = false
882 }
883 w.Columns[w.Focus].Expanded = on
884 w.unmaximize()
885}
886
887// maximize sets FullWidth on column i; unlike ToggleFullWidth it never toggles.
888func (w *Workspace) maximize(i int) {
889 if i >= 0 && i < len(w.Columns) {
890 w.Columns[i].FullWidth = true
891 id := w.Columns[i].Windows[w.Columns[i].Focus]
892 w.maximized = slices.DeleteFunc(w.maximized, func(v WindowID) bool { return v == id })
893 w.maximized = slices.Insert(w.maximized, 0, id)
894 }
895}
896
897// unmaximize clears the focused column in scroll mode, or all maximized
898// columns in fixed mode (including after Escape changed focus).
899func (w *Workspace) unmaximize() {
900 for i := range w.Columns {
901 if w.Overflow == OverflowFixed || i == w.Focus {
902 w.Columns[i].FullWidth = false
903 }
904 }
905 if w.Overflow == OverflowFixed {
906 w.maximized = nil
907 }
908}
909
910// transferMaximization changes the maximized column without forgetting MRU.
911func (w *Workspace) transferMaximization(i int) {
912 if i == w.Focus || i < 0 || i >= len(w.Columns) {
913 return
914 }
915 w.Columns[w.Focus].FullWidth = false
916 w.maximize(i)
917}
918
919// ToggleFullWidth expands the focused tiled column without changing its saved width.
920func (w *Workspace) ToggleFullWidth() {
921 if len(w.Columns) == 0 || w.onFloat() {
922 return
923 }
924 if w.Columns[w.Focus].FullWidth {
925 w.unmaximize()
926 } else {
927 w.maximize(w.Focus)
928 }
929 w.scroll()
930}
931
932func (w *Workspace) ToggleFullscreen() {
933 id, ok := w.Focused()
934 if !ok {
935 return
936 }
937 if w.fullscreen == id {
938 // The user was on it: it keeps the focus, in front of floats that
939 // mapped meanwhile. Cleared first, so that floats it covers drop
940 // below the columns.
941 w.fullscreen = 0
942 w.FocusID(id)
943 w.endFullscreen()
944 return
945 }
946 w.fullscreen = id
947 w.scroll()
948}
949
950// endFullscreen ends the fullscreen: floats it kept demoted are promoted
951// again and the view follows the focus.
952func (w *Workspace) endFullscreen() {
953 w.fullscreen = 0
954 w.reconcileFloats()
955 w.scroll()
956}
957
958// leaveFullscreen ends the fullscreen for another window the user chose,
959// and refuses its client's requests until it is focused again (mayCover,
960// settleLeft).
961func (w *Workspace) leaveFullscreen() {
962 if w.fullscreen != 0 {
963 w.left = w.fullscreen
964 }
965 w.endFullscreen()
966}
967
968// Activate focuses a window and makes it visible: it leaves another
969// window's fullscreen, which hides everything else.
970func (w *Workspace) Activate(id WindowID) {
971 if i := w.stashIndex(id); i >= 0 && w.stashHidden {
972 // A hidden stashed window must be seen: show the stash with it,
973 // selected. Another window's fullscreen leaves first, so its own
974 // pending fullscreen comes back.
975 w.leaveFullscreen()
976 w.stashAt = i
977 w.showStash()
978 }
979 if w.fullscreen != 0 && w.fullscreen != id {
980 w.leaveFullscreen()
981 }
982 w.FocusID(id)
983}
984
985// SetFullscreen applies a client request. It never moves focus: client
986// requests are automatic events (ADR 011 golden rule).
987func (w *Workspace) SetFullscreen(id WindowID, on bool) {
988 if on && !w.mayCover(id) {
989 return
990 }
991 if w.isFloat(id) {
992 if w.stashHidden && w.stashIndex(id) >= 0 {
993 // Applied when the stash is shown again.
994 if on {
995 w.hiddenFullscreen = id
996 } else if w.hiddenFullscreen == id {
997 w.hiddenFullscreen = 0
998 }
999 return
1000 }
1001 }
1002 if !w.has(id) {
1003 return
1004 }
1005 if !on {
1006 if w.fullscreen == id {
1007 w.endFullscreen()
1008 }
1009 return
1010 }
1011 w.fullscreen = id
1012 if !w.isFloat(id) {
1013 w.scroll()
1014 }
1015}
1016
1017// SetOutput sets the logical size of the monitor. The workspace viewport
1018// follows: the whole monitor, or the centered size override.
1019func (w *Workspace) SetOutput(width, height int) {
1020 old := w.monitor
1021 w.monitor = Rect{W: max(width, 0), H: max(height, 0)}
1022 if w.reserved == old {
1023 w.reserved = w.monitor
1024 }
1025 w.SetUsable(w.reserved)
1026}
1027
1028// SetUsable takes the monitor area left by layer surfaces, clamps negative
1029// dimensions to zero and clips it to the monitor. The usable rectangle is
1030// its intersection with the viewport. Effective gaps shrink to fit it.
1031func (w *Workspace) SetUsable(r Rect) {
1032 r.X = min(max(r.X, 0), w.monitor.W)
1033 r.Y = min(max(r.Y, 0), w.monitor.H)
1034 r.W = min(max(r.W, 0), w.monitor.W-r.X)
1035 r.H = min(max(r.H, 0), w.monitor.H-r.Y)
1036 w.reserved = r
1037 w.fit()
1038}
1039
1040// SetSize overrides the logical size of the workspace; a zero side inherits
1041// the monitor, one larger than it is clamped to it.
1042func (w *Workspace) SetSize(width, height int) {
1043 w.size = [2]int{max(width, 0), max(height, 0)}
1044 w.fit()
1045}
1046
1047// fit derives the viewport and usable area from the monitor, its reservations
1048// and the size override.
1049func (w *Workspace) fit() {
1050 side := func(want, have int) int {
1051 if want <= 0 {
1052 return have
1053 }
1054 return min(want, have)
1055 }
1056 vw, vh := side(w.size[0], w.monitor.W), side(w.size[1], w.monitor.H)
1057 w.Output = Rect{X: (w.monitor.W - vw) / 2, Y: (w.monitor.H - vh) / 2, W: vw, H: vh}
1058 r, o := w.reserved, w.Output
1059 x0, y0 := max(r.X, o.X), max(r.Y, o.Y)
1060 x1, y1 := min(r.X+r.W, o.X+o.W), min(r.Y+r.H, o.Y+o.H)
1061 u := Rect{X: min(max(x0, o.X), o.X+o.W), Y: min(max(y0, o.Y), o.Y+o.H)}
1062 u.W, u.H = max(x1-u.X, 0), max(y1-u.Y, 0)
1063 w.Usable = u
1064 w.reconcileFloats()
1065 w.scroll()
1066}
1067func (w *Workspace) SetGaps(g int) {
1068 if g < 0 {
1069 g = 0
1070 }
1071 w.Gaps = g
1072 w.scroll()
1073}
1074func (w *Workspace) SetPresets(v []Width) { w.presets = append([]Width(nil), v...) }
1075func (w *Workspace) SetMaxColumns(n int) {
1076 w.MaxColumns = n
1077 w.scroll()
1078}
1079
1080// overviewArea is the monitor area the overview lays rows out in: the whole
1081// area left by layer surfaces, whatever the workspace's size. Tiles keep the
1082// workspace's own geometry, scaled uniformly.
1083func (w *Workspace) overviewArea() Rect { return w.reserved }
1084
1085func (w *Workspace) gap() int { return min(w.Gaps, w.Usable.W/2, w.Usable.H/2) }
1086
1087// settleLeft drops the latch once its window has the focus again, however
1088// it got it; core calls it after each event.
1089func (w *Workspace) settleLeft() {
1090 if id, ok := w.Focused(); ok && id == w.left {
1091 w.left = 0
1092 }
1093}
1094
1095// mayCover reports whether a client may make id fullscreen. In fixed
1096// overflow it would cover the output at once and take the keyboard from
1097// the focused window, so only the focused window may; the request of
1098// another is refused and the user can still toggle-fullscreen it. A
1099// hidden stash's request waits for the show (showStash). A window whose
1100// fullscreen the user left may only once focused again, in any overflow.
1101func (w *Workspace) mayCover(id WindowID) bool {
1102 if id == w.left {
1103 if focused, ok := w.Focused(); !ok || focused != id {
1104 return false
1105 }
1106 w.left = 0
1107 }
1108 if w.Overflow != OverflowFixed || w.stashHidden && w.stashIndex(id) >= 0 {
1109 return true
1110 }
1111 focused, ok := w.Focused()
1112 return ok && focused == id
1113}
1114
1115// pinned reports whether the covering fullscreen window hides every other
1116// window: focus moves leave it (leaveCover), and the overview shows it as
1117// the front card of its row. Only in scroll overflow does moving to a
1118// tiled neighbor scroll it off and show the target instead.
1119func (w *Workspace) pinned() bool {
1120 c := w.cover()
1121 return c != 0 && (w.Overflow == OverflowFixed || w.isFloat(c))
1122}
1123
1124// leaveCover runs a focus move from the covering fullscreen window as if it
1125// were not fullscreen. When the move reaches another window, fullscreen
1126// ends and that window shows, focused; otherwise (an edge) nothing changes
1127// and the caller goes on to the next workspace or monitor.
1128func (w *Workspace) leaveCover(move func()) bool {
1129 w.focusCover()
1130 full := w.fullscreen
1131 w.fullscreen = 0
1132 move()
1133 if id, ok := w.Focused(); ok && id != full {
1134 w.fullscreen = full
1135 w.leaveFullscreen()
1136 return true
1137 }
1138 w.fullscreen = full
1139 return false
1140}
1141
1142// focusCover points the focus state at the covering fullscreen window,
1143// which Focused already reports, so a user action acts on the window on
1144// screen, not on one it hides.
1145func (w *Workspace) focusCover() {
1146 c := w.cover()
1147 if c == 0 {
1148 return
1149 }
1150 if w.isFloat(c) {
1151 w.FocusID(c)
1152 return
1153 }
1154 w.floatFocus, w.stashFocus = false, false
1155 for i, col := range w.Columns {
1156 if j := slices.Index(col.Windows, c); j >= 0 {
1157 w.Focus, w.Columns[i].Focus = i, j
1158 }
1159 }
1160}
1161
1162// cover returns the fullscreen window that covers the output, or 0. The
1163// fullscreen is exclusive: while it covers, no other window of the
1164// workspace is drawn, so the output can scan it out.
1165func (w *Workspace) cover() WindowID {
1166 if w.fullscreen == 0 {
1167 return 0
1168 }
1169 if w.isFloat(w.fullscreen) || w.Overflow == OverflowFixed {
1170 return w.fullscreen
1171 }
1172 // Scroll overflow: only while its column is aligned on the output.
1173 for i, c := range w.Columns {
1174 if slices.Contains(c.Windows, w.fullscreen) && w.columnX(i)-w.ViewX == 0 {
1175 return w.fullscreen
1176 }
1177 }
1178 return 0
1179}
1180
1181// fullscreenHides reports whether a fullscreen window hides the focused
1182// column's layout: the others (fixed) or its own column (scroll). Column
1183// edits would change what the user cannot see.
1184func (w *Workspace) fullscreenHides() bool {
1185 return w.fullscreen != 0 && (w.Overflow == OverflowFixed || w.fullscreenColumn(w.Focus))
1186}
1187
1188func (w *Workspace) fullscreenColumn(i int) bool {
1189 for _, id := range w.Columns[i].Windows {
1190 if id == w.fullscreen && id != 0 {
1191 return true
1192 }
1193 }
1194 return false
1195}
1196func (w *Workspace) columnWidth(i int) int {
1197 return w.columnWidthFor(i, false)
1198}
1199
1200func (w *Workspace) columnWidthFor(i int, ignoreFullWidth bool) int {
1201 if w.Columns[i].FullWidth && !ignoreFullWidth {
1202 return max(w.Usable.W-2*w.gap(), 0)
1203 }
1204 if w.fullscreenColumn(i) {
1205 return w.Output.W
1206 }
1207 g := w.gap()
1208 // Fixed overflow never scrolls, so presets would push columns off screen.
1209 if w.Columns[i].Width == (Width{}) || w.Overflow == OverflowFixed {
1210 if len(w.Columns) == 1 {
1211 return max(w.Usable.W-2*g, 0)
1212 }
1213 // Equal shares of the width left after gaps; a remainder under k pixels stays empty.
1214 k := min(len(w.Columns), max(w.MaxColumns, 1))
1215 return max((w.Usable.W-g*(k+1))/k, 0)
1216 }
1217 return w.Columns[i].Width.Resolve(w.Usable.W, g)
1218}
1219func (w *Workspace) columnX(i int) int {
1220 x := w.Usable.X + w.gap()
1221 for j := 0; j < i; j++ {
1222 x += w.columnWidth(j) + w.gap()
1223 }
1224 return x
1225}
1226func (w *Workspace) scroll() {
1227 before := w.ViewX
1228 defer func() { w.retarget(before) }()
1229 if w.Overflow == OverflowFixed {
1230 w.ViewX = 0
1231 return
1232 }
1233 if len(w.Columns) == 0 {
1234 return
1235 }
1236 left := w.columnX(w.Focus) - w.ViewX
1237 width := w.columnWidth(w.Focus)
1238 if w.fullscreenColumn(w.Focus) {
1239 w.ViewX += left - w.Output.X
1240 return
1241 }
1242 minX := w.Usable.X + w.gap()
1243 maxX := w.Usable.X + w.Usable.W - w.gap()
1244 if width > maxX-minX || left < minX {
1245 w.ViewX += left - minX
1246 } else if left+width > maxX {
1247 w.ViewX += left + width - maxX
1248 }
1249}
1250
1251// columnRects returns each column's area on screen, before stacking windows.
1252func (w *Workspace) columnRects() []Rect {
1253 return w.columnRectsFor(false)
1254}
1255
1256// columnRectsFor shares the fixed layout geometry with the overview's hidden
1257// columns card, without changing FullWidth or the clients' saved buffers.
1258func (w *Workspace) columnRectsFor(ignoreFullWidth bool) []Rect {
1259 g := w.gap()
1260 y, h := w.Usable.Y+g, max(w.Usable.H-2*g, 0)
1261 rects := make([]Rect, len(w.Columns))
1262 view := w.ViewX + w.shiftPixels()
1263 x := w.Usable.X + g
1264 for i := range w.Columns {
1265 width := w.columnWidthFor(i, ignoreFullWidth)
1266 rects[i] = Rect{X: x - view, Y: y, W: width, H: h}
1267 x += width + g
1268 }
1269 if !ignoreFullWidth && w.Overflow == OverflowFixed && len(w.Columns) > 0 && w.Columns[w.Focus].FullWidth {
1270 rects[w.Focus].X = w.Usable.X + g
1271 return rects
1272 }
1273 k := max(w.MaxColumns, 1)
1274 if e := slices.IndexFunc(w.Columns, func(c Column) bool { return c.Expanded }); w.Overflow == OverflowFixed && e >= 0 && k > 1 && len(w.Columns) > 1 {
1275 return w.expandedRects(e, k, y, h)
1276 }
1277 if w.Overflow != OverflowFixed || len(w.Columns) <= k {
1278 return rects
1279 }
1280 // The last slot holds the spiral; the columns before it keep their place.
1281 area := rects[k-1]
1282 for i := k - 1; i < len(w.Columns)-1; i++ {
1283 rects[i], area = split(area, g, (i-k+1)%2 == 0)
1284 }
1285 rects[len(rects)-1] = area
1286 return rects
1287}
1288
1289// expandedRects places expanded column e over k-1 cells in its place. The
1290// columns before it stack in a strip on its left, those after it on its
1291// right; the two strips share the last cell.
1292func (w *Workspace) expandedRects(e, k, y, h int) []Rect {
1293 g := w.gap()
1294 cell := max((w.Usable.W-g*(k+1))/k, 0)
1295 wide := (k-1)*cell + (k-2)*g
1296 rest := max(w.Usable.W-2*g-wide-g, 0)
1297 before, after := w.Columns[:e], w.Columns[e+1:]
1298 leftW, rightW := rest, rest
1299 if len(before) > 0 && len(after) > 0 {
1300 leftW = max((rest-g)/2, 0)
1301 rightW = max(rest-g-leftW, 0)
1302 }
1303 rects := make([]Rect, 0, len(w.Columns))
1304 x := w.Usable.X + g
1305 if len(before) > 0 {
1306 rects = append(rects, stackRects(Rect{X: x, Y: y, W: leftW, H: h}, len(before), g)...)
1307 x += leftW + g
1308 }
1309 rects = append(rects, Rect{X: x, Y: y, W: wide, H: h})
1310 if len(after) > 0 {
1311 rects = append(rects, stackRects(Rect{X: x + wide + g, Y: y, W: rightW, H: h}, len(after), g)...)
1312 }
1313 // Gaps wider than a narrow output would push columns past its edge.
1314 right := w.Usable.X + w.Usable.W
1315 for i := range rects {
1316 rects[i].X = min(rects[i].X, right)
1317 rects[i].W = min(rects[i].W, right-rects[i].X)
1318 }
1319 return rects
1320}
1321
1322// stackRects cuts r in n rows with a gap between them; the last row takes
1323// the rounding remainder. Rows past the bottom (gaps taller than r) are
1324// clamped to it, like windows stacked in a column.
1325func stackRects(r Rect, n, gap int) []Rect {
1326 rows := make([]Rect, n)
1327 avail := max(r.H-(n-1)*gap, 0)
1328 height := avail / n
1329 yy, bottom := r.Y, r.Y+r.H
1330 for i := range rows {
1331 hh := height
1332 if i == n-1 {
1333 hh = avail - height*(n-1)
1334 }
1335 yy = min(yy, bottom)
1336 hh = min(hh, bottom-yy)
1337 rows[i] = Rect{X: r.X, Y: yy, W: r.W, H: hh}
1338 yy += hh + gap
1339 }
1340 return rows
1341}
1342
1343// rowRects splits column rect r into the rows of c: by c.Shares when they
1344// are valid, else equally (stackRects).
1345func rowRects(r Rect, c Column, gap int) []Rect {
1346 n := len(c.Windows)
1347 if !validShares(c) {
1348 return stackRects(r, n, gap)
1349 }
1350 rows := make([]Rect, n)
1351 avail := max(r.H-(n-1)*gap, 0)
1352 yy, bottom, used := r.Y, r.Y+r.H, 0
1353 for i, share := range c.Shares {
1354 hh := avail * share / 100
1355 if i == n-1 {
1356 hh = avail - used
1357 }
1358 used += hh
1359 yy = min(yy, bottom)
1360 hh = min(hh, bottom-yy)
1361 rows[i] = Rect{X: r.X, Y: yy, W: r.W, H: hh}
1362 yy += hh + gap
1363 }
1364 return rows
1365}
1366
1367// validShares reports whether c.Shares has one share per window, each at
1368// least 1, summing to 100.
1369func validShares(c Column) bool {
1370 if len(c.Shares) != len(c.Windows) || len(c.Shares) < 2 {
1371 return false
1372 }
1373 sum := 0
1374 for _, v := range c.Shares {
1375 if v < 1 {
1376 return false
1377 }
1378 sum += v
1379 }
1380 return sum == 100
1381}
1382
1383// split cuts r in two halves with a gap: top/bottom when vertical, else left/right.
1384func split(r Rect, gap int, vertical bool) (Rect, Rect) {
1385 if vertical {
1386 h := max((r.H-gap)/2, 0)
1387 return Rect{X: r.X, Y: r.Y, W: r.W, H: h}, Rect{X: r.X, Y: r.Y + h + gap, W: r.W, H: max(r.H-gap-h, 0)}
1388 }
1389 w := max((r.W-gap)/2, 0)
1390 return Rect{X: r.X, Y: r.Y, W: w, H: r.H}, Rect{X: r.X + w + gap, Y: r.Y, W: max(r.W-gap-w, 0), H: r.H}
1391}
1392
1393func (w *Workspace) Layout() []Placement {
1394 var result []Placement
1395 gap := w.gap()
1396 cols := w.columnRects()
1397 focusedID, _ := w.Focused()
1398 cover := w.cover()
1399 for i, c := range w.Columns {
1400 col := cols[i]
1401 n := len(c.Windows)
1402 if n == 0 {
1403 continue
1404 }
1405 fullColumn := w.fullscreenColumn(i)
1406 if fullColumn {
1407 col.W = w.Output.W
1408 }
1409 rows := rowRects(col, c, gap)
1410 for j, id := range c.Windows {
1411 r := rows[j]
1412 full := w.fullscreen == id && id != 0
1413 // Fixed overflow cannot scroll to other columns while one fills
1414 // the view. Keep them in place, but out of the scene.
1415 maximized := w.Overflow == OverflowFixed && w.Columns[w.Focus].FullWidth && i != w.Focus
1416 hidden := (cover != 0 && id != cover) || ((fullColumn || w.Overflow == OverflowFixed && w.fullscreen != 0) && !full) || maximized
1417 if full {
1418 // Scroll mode aligns the view on the column; fixed never scrolls.
1419 r = w.Output
1420 if w.Overflow != OverflowFixed {
1421 r.X = col.X
1422 }
1423 }
1424 if hidden {
1425 r = Rect{}
1426 }
1427 result = append(result, Placement{ID: id, Rect: r, Fullscreen: full, Focused: id == focusedID, Hidden: hidden})
1428 }
1429 }
1430 setVisibleNeighbors(result, gap, w.Output)
1431 // The column/stash group sits between demoted covering floats and
1432 // floats above it. Keep the order within each group stable.
1433 tiles := result
1434 result = nil
1435 const (
1436 belowTiles = iota
1437 coveringFloats
1438 dialogs
1439 )
1440 appendFloats := func(group int) {
1441 for _, f := range w.Floats {
1442 below := f.below && w.coversFloat(f)
1443 // Dialogs stay over covering floats even when the latter is
1444 // selected. Fullscreen floats remain in the upper group.
1445 order := dialogs
1446 if below {
1447 order = belowTiles
1448 } else if w.coversFloat(f) || w.fullscreen == f.ID {
1449 order = coveringFloats
1450 }
1451 if order != group {
1452 continue
1453 }
1454 // A covering fullscreen window hides every float, its own dialogs
1455 // too: they show again when it leaves fullscreen.
1456 p := Placement{ID: f.ID, Rect: w.floatRect(f), Floating: true, Below: below, Focused: f.ID == focusedID, Inset: ports.SideAll, Hidden: cover != 0 && f.ID != cover}
1457 if p.Hidden {
1458 p.Rect = Rect{}
1459 result = append(result, p)
1460 continue
1461 }
1462 if w.fullscreen == f.ID {
1463 p.Rect, p.Fullscreen, p.Inset = w.Output, true, 0
1464 }
1465 result = append(result, p)
1466 }
1467 }
1468 appendFloats(belowTiles)
1469 result = append(result, tiles...)
1470 result = append(result, w.stashLayout(focusedID, cover)...)
1471 appendFloats(coveringFloats)
1472 appendFloats(dialogs)
1473 return result
1474}
1475
1476// setVisibleNeighbors reserves client space only for shared lines that
1477// are actually on this output. A scrolled-off or hidden tile cannot give a
1478// lone visible tile a border (or shrink its client).
1479func setVisibleNeighbors(tiles []Placement, gap int, output Rect) {
1480 visible := func(p Placement) bool {
1481 return !p.Hidden && !p.Fullscreen && p.Rect.Overlaps(output)
1482 }
1483 overlap := func(a0, a1, b0, b1 int) bool { return a0 < b1 && b0 < a1 }
1484 for i := range tiles {
1485 a := &tiles[i]
1486 a.Neighbors, a.Inset = 0, 0
1487 if !visible(*a) {
1488 continue
1489 }
1490 for j := range tiles {
1491 if i == j || !visible(tiles[j]) {
1492 continue
1493 }
1494 b, r := tiles[j].Rect, a.Rect
1495 // Only count a shared edge strictly within this output.
1496 switch {
1497 case r.X+r.W+gap == b.X && overlap(r.Y, r.Y+r.H, b.Y, b.Y+b.H) && r.X+r.W > output.X && r.X+r.W < output.X+output.W:
1498 a.Neighbors |= ports.SideRight
1499 case b.X+b.W+gap == r.X && overlap(r.Y, r.Y+r.H, b.Y, b.Y+b.H) && r.X > output.X && r.X < output.X+output.W:
1500 a.Neighbors |= ports.SideLeft
1501 case r.Y+r.H+gap == b.Y && overlap(r.X, r.X+r.W, b.X, b.X+b.W) && r.Y+r.H > output.Y && r.Y+r.H < output.Y+output.H:
1502 a.Neighbors |= ports.SideBottom
1503 case b.Y+b.H+gap == r.Y && overlap(r.X, r.X+r.W, b.X, b.X+b.W) && r.Y > output.Y && r.Y < output.Y+output.H:
1504 a.Neighbors |= ports.SideTop
1505 }
1506 }
1507 a.Inset = a.Neighbors
1508 if gap == 0 {
1509 a.Inset &= ports.SideRight | ports.SideBottom
1510 }
1511 }
1512}
1513
1514// floatRect places a floating window, its border around its client size,
1515// clamped to the usable area: a native one centred, a free one at its
1516// centre, kept inside the area.
1517func (w *Workspace) floatRect(f Float) Rect {
1518 u := w.Usable
1519 fw, fh := f.W, f.H
1520 if fw <= 0 || fh <= 0 {
1521 fw, fh = u.W/2, u.H/2
1522 }
1523 fw, fh = min(fw+2*w.border, u.W), min(fh+2*w.border, u.H)
1524 if !f.free {
1525 return Rect{X: u.X + (u.W-fw)/2, Y: u.Y + (u.H-fh)/2, W: fw, H: fh}
1526 }
1527 x := u.X + int(math.Round(f.cx*float64(u.W))) - fw/2
1528 y := u.Y + int(math.Round(f.cy*float64(u.H))) - fh/2
1529 x = min(max(x, u.X), u.X+u.W-fw)
1530 y = min(max(y, u.Y), u.Y+u.H-fh)
1531 return Rect{X: x, Y: y, W: fw, H: fh}
1532}
1533
1534// imposedFloat reports whether core, rather than the client, owns the
1535// size of a floating window: a stashed one or a free float.
1536func (w *Workspace) imposedFloat(id WindowID) bool {
1537 if i := w.floatIndex(id); i >= 0 {
1538 return w.Floats[i].free
1539 }
1540 return w.stashIndex(id) >= 0
1541}
1542
1543// ToggleWindowStash stashes the focused tile, or returns the focused
1544// stashed window to its column. A native float becomes a new column.
1545func (w *Workspace) ToggleWindowStash() {
1546 id, ok := w.Focused()
1547 // A fullscreen window (a Wine game in scanout) keeps its place: it
1548 // leaves fullscreen first, then may float.
1549 if !ok || id == w.fullscreen {
1550 return
1551 }
1552 switch {
1553 case w.floatIndex(id) >= 0 && w.Floats[w.floatIndex(id)].free:
1554 // A free float keeps its place and size in the stash.
1555 f := w.Floats[w.floatIndex(id)]
1556 w.RemoveWindow(id)
1557 w.addStash(f)
1558 case w.floatIndex(id) >= 0:
1559 w.RemoveWindow(id)
1560 w.restore(id, nil)
1561 case w.stashIndex(id) >= 0:
1562 w.unstash(w.stashIndex(id))
1563 default:
1564 w.stashWindow(id)
1565 }
1566}