From f6bad7efd76109de122bb3b670d0e18f86ec38bb Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Fri, 8 Jun 2018 20:54:22 +0000
Subject: Instead of working out which pane to resize with the mouse by walking
 the panes list, look through the layout cells for the nearest border and
 resize that cell. From Dan Aloni in GitHub issue 1374.

---
 layout.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 65 insertions(+), 22 deletions(-)

(limited to 'layout.c')

diff --git a/layout.c b/layout.c
index bab95868..e1112ffa 100644
--- a/layout.c
+++ b/layout.c
@@ -127,6 +127,42 @@ layout_print_cell(struct layout_cell *lc, const char *hdr, u_int n)
 	}
 }
 
+struct layout_cell *
+layout_search_by_border(struct layout_cell *lc, u_int x, u_int y)
+{
+	struct layout_cell	*lcchild, *last = NULL;
+
+	TAILQ_FOREACH(lcchild, &lc->cells, entry) {
+		if (x >= lcchild->xoff && x < lcchild->xoff + lcchild->sx &&
+		    y >= lcchild->yoff && y < lcchild->yoff + lcchild->sy) {
+			/* Inside the cell - recurse. */
+			return (layout_search_by_border(lcchild, x, y));
+		}
+
+		if (last == NULL) {
+			last = lcchild;
+			continue;
+		}
+
+		switch (lc->type) {
+		case LAYOUT_LEFTRIGHT:
+			if (x < lcchild->xoff && x >= last->xoff + last->sx)
+				return (last);
+			break;
+		case LAYOUT_TOPBOTTOM:
+			if (y < lcchild->yoff && y >= last->yoff + last->sy)
+				return (last);
+			break;
+		case LAYOUT_WINDOWPANE:
+			break;
+		}
+
+		last = lcchild;
+	}
+
+	return (NULL);
+}
+
 void
 layout_set_size(struct layout_cell *lc, u_int sx, u_int sy, u_int xoff,
     u_int yoff)
@@ -550,14 +586,40 @@ layout_resize_pane_to(struct window_pane *wp, enum layout_type type,
 	layout_resize_pane(wp, type, change, 1);
 }
 
+void
+layout_resize_layout(struct window *w, struct layout_cell *lc,
+    enum layout_type type, int change, int opposite)
+{
+	int	needed, size;
+
+	/* Grow or shrink the cell. */
+	needed = change;
+	while (needed != 0) {
+		if (change > 0) {
+			size = layout_resize_pane_grow(w, lc, type, needed,
+			    opposite);
+			needed -= size;
+		} else {
+			size = layout_resize_pane_shrink(w, lc, type, needed);
+			needed += size;
+		}
+
+		if (size == 0)	/* no more change possible */
+			break;
+	}
+
+	/* Fix cell offsets. */
+	layout_fix_offsets(w->layout_root);
+	layout_fix_panes(w, w->sx, w->sy);
+	notify_window("window-layout-changed", w);
+}
+
 /* Resize a single pane within the layout. */
 void
 layout_resize_pane(struct window_pane *wp, enum layout_type type, int change,
     int opposite)
 {
-	struct window		*w = wp->window;
 	struct layout_cell	*lc, *lcparent;
-	int			 needed, size;
 
 	lc = wp->layout_cell;
 
@@ -574,26 +636,7 @@ layout_resize_pane(struct window_pane *wp, enum layout_type type, int change,
 	if (lc == TAILQ_LAST(&lcparent->cells, layout_cells))
 		lc = TAILQ_PREV(lc, layout_cells, entry);
 
-	/* Grow or shrink the cell. */
-	needed = change;
-	while (needed != 0) {
-		if (change > 0) {
-			size = layout_resize_pane_grow(w, lc, type, needed,
-			    opposite);
-			needed -= size;
-		} else {
-			size = layout_resize_pane_shrink(w, lc, type, needed);
-			needed += size;
-		}
-
-		if (size == 0)	/* no more change possible */
-			break;
-	}
-
-	/* Fix cell offsets. */
-	layout_fix_offsets(wp->window->layout_root);
-	layout_fix_panes(wp->window, wp->window->sx, wp->window->sy);
-	notify_window("window-layout-changed", wp->window);
+	layout_resize_layout(wp->window, lc, type, change, opposite);
 }
 
 /* Helper function to grow pane. */
-- 
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