From 75e58206222ff2d5ec4585162c277d4109643cdc Mon Sep 17 00:00:00 2001
From: Benjamin Chausse <benjamin@chausse.xyz>
Date: Mon, 22 Jul 2024 23:29:34 -0400
Subject: Implement relative-mouse-resize

https://codeberg.org/dwl/dwl-patches/src/branch/main/patches/relative-mouse-resize
---
 dwl.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 59 insertions(+), 7 deletions(-)

diff --git a/dwl.c b/dwl.c
index c497207..3b3333b 100644
--- a/dwl.c
+++ b/dwl.c
@@ -407,7 +407,8 @@ static struct wlr_seat *seat;
 static KeyboardGroup *kb_group;
 static unsigned int cursor_mode;
 static Client *grabc;
-static int grabcx, grabcy; /* client-relative */
+static Client initial_grabc;
+static int grabcx, grabcy, grabx, graby, grabcenterx, grabcentery; /* client-relative */
 
 static struct wlr_output_layout *output_layout;
 static struct wlr_box sgeom;
@@ -1904,8 +1905,27 @@ motionnotify(uint32_t time, struct wlr_input_device *device, double dx, double d
 			.width = grabc->geom.width, .height = grabc->geom.height}, 1);
 		return;
 	} else if (cursor_mode == CurResize) {
-		resize(grabc, (struct wlr_box){.x = grabc->geom.x, .y = grabc->geom.y,
-			.width = (int)round(cursor->x) - grabc->geom.x, .height = (int)round(cursor->y) - grabc->geom.y}, 1);
+		if (grabcenterx < grabx) {
+			if (grabcentery < graby) {
+				/* bottom-right */
+				resize(grabc, (struct wlr_box){.x = initial_grabc.geom.x, .y = initial_grabc.geom.y,
+					.width = (int)round(cursor->x) - initial_grabc.geom.x, .height = (int)round(cursor->y) - initial_grabc.geom.y}, 1);
+			} else {
+				/* top-right */
+				resize(grabc, (struct wlr_box){.x = initial_grabc.geom.x, .y = (int)round(cursor->y),
+					.width = (int)round(cursor->x) - initial_grabc.geom.x, .height = initial_grabc.geom.y + initial_grabc.geom.height - (int)round(cursor->y)}, 1);
+			}
+		} else {
+			if (grabcentery < graby) {
+				/* bottom-left */
+				resize(grabc, (struct wlr_box){.x = (int)round(cursor->x), .y = initial_grabc.geom.y,
+					.width = initial_grabc.geom.x + initial_grabc.geom.width - (int)round(cursor->x), .height = (int)round(cursor->y) - initial_grabc.geom.y}, 1);
+			} else {
+				/* top-left */
+				resize(grabc, (struct wlr_box){.x = (int)round(cursor->x), .y = (int)round(cursor->y),
+					.width = initial_grabc.geom.x + initial_grabc.geom.width - (int)round(cursor->x), .height = initial_grabc.geom.y + initial_grabc.geom.height - (int)round(cursor->y)}, 1);
+			}
+		}
 		return;
 	}
 
@@ -1953,10 +1973,42 @@ moveresize(const Arg *arg)
 	case CurResize:
 		/* Doesn't work for X11 output - the next absolute motion event
 		 * returns the cursor to where it started */
-		wlr_cursor_warp_closest(cursor, NULL,
-				grabc->geom.x + grabc->geom.width,
-				grabc->geom.y + grabc->geom.height);
-		wlr_cursor_set_xcursor(cursor, cursor_mgr, "se-resize");
+		initial_grabc = *grabc;
+		grabx = (int)round(cursor->x);
+		graby = (int)round(cursor->y);
+		grabcx = (int)round(cursor->x) - grabc->geom.x;
+		grabcy = (int)round(cursor->y) - grabc->geom.y;
+		grabcenterx = grabc->geom.width / 2 + grabc->geom.x;
+		grabcentery = grabc->geom.height / 2 + grabc->geom.y;
+		if (grabcenterx < grabx) {
+			if (grabcentery < graby) {
+				/* bottom-right */
+				wlr_cursor_warp_closest(cursor, NULL,
+					grabc->geom.x + grabc->geom.width,
+					grabc->geom.y + grabc->geom.height);
+				wlr_cursor_set_xcursor(cursor, cursor_mgr, "se-resize");
+			} else {
+				/* top-right */
+				wlr_cursor_warp_closest(cursor, NULL,
+					grabc->geom.x + grabc->geom.width,
+					grabc->geom.y);
+				wlr_cursor_set_xcursor(cursor, cursor_mgr, "ne-resize");
+			}
+		} else {
+			if (grabcentery < graby) {
+				/* bottom-left */
+				wlr_cursor_warp_closest(cursor, NULL,
+					grabc->geom.x,
+					grabc->geom.y + grabc->geom.height);
+				wlr_cursor_set_xcursor(cursor, cursor_mgr, "sw-resize");
+			} else {
+				/* top-left */
+				wlr_cursor_warp_closest(cursor, NULL,
+					grabc->geom.x,
+					grabc->geom.y);
+				wlr_cursor_set_xcursor(cursor, cursor_mgr, "nw-resize");
+			}
+		}
 		break;
 	}
 }
-- 
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