From e6cbeb4f38d5e38df1b6b9b46145c9a2b7dd11a1 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Sat, 9 Jun 2018 17:05:52 +0000
Subject: Make it possible to resize multiple panes by dragging corners, from
 Dan Aloni in GitHub issue 1376.

---
 cmd-resize-pane.c | 46 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 36 insertions(+), 10 deletions(-)

(limited to 'cmd-resize-pane.c')

diff --git a/cmd-resize-pane.c b/cmd-resize-pane.c
index cfde83b3..7e4c58cf 100644
--- a/cmd-resize-pane.c
+++ b/cmd-resize-pane.c
@@ -131,7 +131,12 @@ cmd_resize_pane_mouse_update(struct client *c, struct mouse_event *m)
 	struct winlink		*wl;
 	struct window		*w;
 	u_int			 y, ly, x, lx;
-	struct layout_cell	*lc;
+	struct layout_cell	*cells[5], *lc;
+	u_int			 ncells = 0, i, j, resizes = 0;
+	enum layout_type	 type;
+	static const int         offsets[nitems(cells)][2] = {
+	    { 0, 0 }, { 0, 1 }, { 1, 0 }, { 0, -1 }, { -1, 0 },
+	};
 
 	wl = cmd_mouse_window(m, NULL);
 	if (wl == NULL) {
@@ -151,16 +156,37 @@ cmd_resize_pane_mouse_update(struct client *c, struct mouse_event *m)
 	else if (m->statusat > 0 && ly >= (u_int)m->statusat)
 		ly = m->statusat - 1;
 
-	lc = layout_search_by_border(w->layout_root, lx, ly);
-	if (lc == NULL)
-		return;
+	for (i = 0; i < nitems(cells); i++) {
+		lc = layout_search_by_border(w->layout_root, lx + offsets[i][0],
+		    ly + offsets[i][1]);
+		if (lc == NULL)
+			continue;
+
+		for (j = 0; j < ncells; j++) {
+			if (cells[j] == lc) {
+				lc = NULL;
+				break;
+			}
+		}
+		if (lc == NULL)
+			continue;
 
-	if (y != ly && lc->parent->type == LAYOUT_TOPBOTTOM)
-		layout_resize_layout(w, lc, LAYOUT_TOPBOTTOM, y - ly, 0);
-	else if (x != lx && lc->parent->type == LAYOUT_LEFTRIGHT)
-		layout_resize_layout(w, lc, LAYOUT_LEFTRIGHT, x - lx, 0);
-	else
+		cells[ncells] = lc;
+		ncells++;
+	}
+	if (ncells == 0)
 		return;
 
-	server_redraw_window(w);
+	for (i = 0; i < ncells; i++) {
+		type = cells[i]->parent->type;
+		if (y != ly && type == LAYOUT_TOPBOTTOM) {
+			layout_resize_layout(w, cells[i], type, y - ly, 0);
+			resizes++;
+		} else if (x != lx && type == LAYOUT_LEFTRIGHT) {
+			layout_resize_layout(w, cells[i], type, x - lx, 0);
+			resizes++;
+		}
+	}
+	if (resizes != 0)
+		server_redraw_window(w);
 }
-- 
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